CA2398782C - Aqueous coating material that can be hardened physically, thermally or thermally and with actinic radiation and the utilization thereof - Google Patents
Aqueous coating material that can be hardened physically, thermally or thermally and with actinic radiation and the utilization thereof Download PDFInfo
- Publication number
- CA2398782C CA2398782C CA002398782A CA2398782A CA2398782C CA 2398782 C CA2398782 C CA 2398782C CA 002398782 A CA002398782 A CA 002398782A CA 2398782 A CA2398782 A CA 2398782A CA 2398782 C CA2398782 C CA 2398782C
- Authority
- CA
- Canada
- Prior art keywords
- coating material
- aqueous
- aqueous coating
- thermally
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims abstract description 125
- 238000000576 coating method Methods 0.000 title claims abstract description 104
- 239000011248 coating agent Substances 0.000 title claims abstract description 99
- 230000005855 radiation Effects 0.000 title claims abstract description 24
- 239000000049 pigment Substances 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 36
- 239000002245 particle Substances 0.000 claims abstract description 28
- 239000004814 polyurethane Substances 0.000 claims abstract description 24
- 150000001875 compounds Chemical class 0.000 claims abstract description 23
- 229920002635 polyurethane Polymers 0.000 claims abstract description 23
- 239000011230 binding agent Substances 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- -1 aluminum silicates Chemical class 0.000 claims description 32
- 230000000694 effects Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 238000001723 curing Methods 0.000 claims description 19
- 239000003973 paint Substances 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 239000000470 constituent Substances 0.000 claims description 16
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 239000000391 magnesium silicate Substances 0.000 claims description 5
- 238000001029 thermal curing Methods 0.000 claims description 5
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 235000012243 magnesium silicates Nutrition 0.000 claims description 4
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- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims description 2
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- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 2
- 239000001506 calcium phosphate Substances 0.000 claims description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 2
- 235000011010 calcium phosphates Nutrition 0.000 claims description 2
- 235000012241 calcium silicate Nutrition 0.000 claims description 2
- 229920001795 coordination polymer Polymers 0.000 claims description 2
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- 150000003839 salts Chemical class 0.000 claims description 2
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 2
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- 239000007864 aqueous solution Substances 0.000 description 5
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- 150000001450 anions Chemical class 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 4
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- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 239000003085 diluting agent Substances 0.000 description 4
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- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 4
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- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 description 3
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- BMRWNKZVCUKKSR-UHFFFAOYSA-N butane-1,2-diol Chemical compound CCC(O)CO BMRWNKZVCUKKSR-UHFFFAOYSA-N 0.000 description 1
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- VDQQXEISLMTGAB-UHFFFAOYSA-N chloramine T Chemical compound [Na+].CC1=CC=C(S(=O)(=O)[N-]Cl)C=C1 VDQQXEISLMTGAB-UHFFFAOYSA-N 0.000 description 1
- PMMYEEVYMWASQN-IMJSIDKUSA-N cis-4-Hydroxy-L-proline Chemical compound O[C@@H]1CN[C@H](C(O)=O)C1 PMMYEEVYMWASQN-IMJSIDKUSA-N 0.000 description 1
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- WYHYNUWZLKTEEY-UHFFFAOYSA-N cyclobutane-1,3-dicarboxylic acid Chemical compound OC(=O)C1CC(C(O)=O)C1 WYHYNUWZLKTEEY-UHFFFAOYSA-N 0.000 description 1
- CFBGXYDUODCMNS-UHFFFAOYSA-N cyclobutene Chemical compound C1CC=C1 CFBGXYDUODCMNS-UHFFFAOYSA-N 0.000 description 1
- ZXIJMRYMVAMXQP-UHFFFAOYSA-N cycloheptene Chemical compound C1CCC=CCC1 ZXIJMRYMVAMXQP-UHFFFAOYSA-N 0.000 description 1
- IFDVQVHZEKPUSC-UHFFFAOYSA-N cyclohex-3-ene-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCC=CC1C(O)=O IFDVQVHZEKPUSC-UHFFFAOYSA-N 0.000 description 1
- QSAWQNUELGIYBC-UHFFFAOYSA-N cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCCCC1C(O)=O QSAWQNUELGIYBC-UHFFFAOYSA-N 0.000 description 1
- XBZSBBLNHFMTEB-UHFFFAOYSA-N cyclohexane-1,3-dicarboxylic acid Chemical compound OC(=O)C1CCCC(C(O)=O)C1 XBZSBBLNHFMTEB-UHFFFAOYSA-N 0.000 description 1
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- LNGJOYPCXLOTKL-UHFFFAOYSA-N cyclopentane-1,3-dicarboxylic acid Chemical compound OC(=O)C1CCC(C(O)=O)C1 LNGJOYPCXLOTKL-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
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- KORSJDCBLAPZEQ-UHFFFAOYSA-N dicyclohexylmethane-4,4'-diisocyanate Chemical compound C1CC(N=C=O)CCC1CC1CCC(N=C=O)CC1 KORSJDCBLAPZEQ-UHFFFAOYSA-N 0.000 description 1
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- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- GGSUCNLOZRCGPQ-UHFFFAOYSA-N diethylaniline Chemical compound CCN(CC)C1=CC=CC=C1 GGSUCNLOZRCGPQ-UHFFFAOYSA-N 0.000 description 1
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- 238000007598 dipping method Methods 0.000 description 1
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- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
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- 150000002118 epoxides Chemical class 0.000 description 1
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 1
- BXOUVIIITJXIKB-UHFFFAOYSA-N ethene;styrene Chemical compound C=C.C=CC1=CC=CC=C1 BXOUVIIITJXIKB-UHFFFAOYSA-N 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical class OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
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- 239000003063 flame retardant Substances 0.000 description 1
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- 235000013312 flour Nutrition 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
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- 239000000727 fraction Substances 0.000 description 1
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- 239000011491 glass wool Substances 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 description 1
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- ACCCMOQWYVYDOT-UHFFFAOYSA-N hexane-1,1-diol Chemical compound CCCCCC(O)O ACCCMOQWYVYDOT-UHFFFAOYSA-N 0.000 description 1
- AVIYEYCFMVPYST-UHFFFAOYSA-N hexane-1,3-diol Chemical compound CCCC(O)CCO AVIYEYCFMVPYST-UHFFFAOYSA-N 0.000 description 1
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- LMHJFKYQYDSOQO-UHFFFAOYSA-N hydroxydecanoic acid Natural products CCCCCC(O)CCCC(O)=O LMHJFKYQYDSOQO-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
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- UHOKSCJSTAHBSO-UHFFFAOYSA-N indanthrone blue Chemical compound C1=CC=C2C(=O)C3=CC=C4NC5=C6C(=O)C7=CC=CC=C7C(=O)C6=CC=C5NC4=C3C(=O)C2=C1 UHOKSCJSTAHBSO-UHFFFAOYSA-N 0.000 description 1
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- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 125000003010 ionic group Chemical group 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- WTFXARWRTYJXII-UHFFFAOYSA-N iron(2+);iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+2].[Fe+3].[Fe+3] WTFXARWRTYJXII-UHFFFAOYSA-N 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 125000001261 isocyanato group Chemical group *N=C=O 0.000 description 1
- WARQUFORVQESFF-UHFFFAOYSA-N isocyanatoethene Chemical compound C=CN=C=O WARQUFORVQESFF-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
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- XCOBTUNSZUJCDH-UHFFFAOYSA-B lithium magnesium sodium silicate Chemical compound [Li+].[Li+].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Na+].[Na+].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].O1[Si](O2)([O-])O[Si]3([O-])O[Si]1([O-])O[Si]2([O-])O3.O1[Si](O2)([O-])O[Si]3([O-])O[Si]1([O-])O[Si]2([O-])O3.O1[Si](O2)([O-])O[Si]3([O-])O[Si]1([O-])O[Si]2([O-])O3.O1[Si](O2)([O-])O[Si]3([O-])O[Si]1([O-])O[Si]2([O-])O3.O1[Si](O2)([O-])O[Si]3([O-])O[Si]1([O-])O[Si]2([O-])O3.O1[Si](O2)([O-])O[Si]3([O-])O[Si]1([O-])O[Si]2([O-])O3 XCOBTUNSZUJCDH-UHFFFAOYSA-B 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- NEMFQSKAPLGFIP-UHFFFAOYSA-N magnesiosodium Chemical compound [Na].[Mg] NEMFQSKAPLGFIP-UHFFFAOYSA-N 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002734 metacrylic acid derivatives Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- RTWNYYOXLSILQN-UHFFFAOYSA-N methanediamine Chemical compound NCN RTWNYYOXLSILQN-UHFFFAOYSA-N 0.000 description 1
- YDKNBNOOCSNPNS-UHFFFAOYSA-N methyl 1,3-benzoxazole-2-carboxylate Chemical compound C1=CC=C2OC(C(=O)OC)=NC2=C1 YDKNBNOOCSNPNS-UHFFFAOYSA-N 0.000 description 1
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000002762 monocarboxylic acid derivatives Chemical class 0.000 description 1
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- ZETYUTMSJWMKNQ-UHFFFAOYSA-N n,n',n'-trimethylhexane-1,6-diamine Chemical compound CNCCCCCCN(C)C ZETYUTMSJWMKNQ-UHFFFAOYSA-N 0.000 description 1
- WSTNFGAKGUERTC-UHFFFAOYSA-N n-ethylhexan-1-amine Chemical group CCCCCCNCC WSTNFGAKGUERTC-UHFFFAOYSA-N 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- JFNLZVQOOSMTJK-KNVOCYPGSA-N norbornene Chemical compound C1[C@@H]2CC[C@H]1C=C2 JFNLZVQOOSMTJK-KNVOCYPGSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000006384 oligomerization reaction Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 125000002524 organometallic group Chemical group 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 125000005702 oxyalkylene group Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- RGSFGYAAUTVSQA-UHFFFAOYSA-N pentamethylene Natural products C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- DGTNSSLYPYDJGL-UHFFFAOYSA-N phenyl isocyanate Chemical compound O=C=NC1=CC=CC=C1 DGTNSSLYPYDJGL-UHFFFAOYSA-N 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-N phosphine group Chemical group P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 1
- 125000005496 phosphonium group Chemical group 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 239000012994 photoredox catalyst Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920001290 polyvinyl ester Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012673 precipitation polymerization Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- QCTJRYGLPAFRMS-UHFFFAOYSA-N prop-2-enoic acid;1,3,5-triazine-2,4,6-triamine Chemical class OC(=O)C=C.NC1=NC(N)=NC(N)=N1 QCTJRYGLPAFRMS-UHFFFAOYSA-N 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 235000013772 propylene glycol Nutrition 0.000 description 1
- KIDHWZJUCRJVML-UHFFFAOYSA-N putrescine Chemical compound NCCCCN KIDHWZJUCRJVML-UHFFFAOYSA-N 0.000 description 1
- 125000001453 quaternary ammonium group Chemical group 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- UFDHBDMSHIXOKF-UHFFFAOYSA-N tetrahydrophthalic acid Natural products OC(=O)C1=C(C(O)=O)CCCC1 UFDHBDMSHIXOKF-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- ODHXBMXNKOYIBV-UHFFFAOYSA-N triphenylamine Chemical compound C1=CC=CC=C1N(C=1C=CC=CC=1)C1=CC=CC=C1 ODHXBMXNKOYIBV-UHFFFAOYSA-N 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
Abstract
The invention concerns an aqueous coating material that can be hardened physically, thermally or thermally and with actinic radiation, containing: A) at least one ionically and/or non-ionically stabilized polyurethane that is saturated, unsaturated and/or grafted with olefinically unsaturated compounds as binding agent; B) at least one coloring and/or effect-giving pigment and C) at least one colorless powder that is substantially inert, transparent or opaque in relation to the other components of the coating material and that has a mean particle size ranging from 1.0 to 10.0 µm, whose particles have a density ranging from 0.8 to 3.6 gcm-3.
The invention also relates to the utilization of the aqueous coating material for the production of monolayer and multilayer coloring and/or effect-giving enamels for primed and unprimed substrates.
The invention also relates to the utilization of the aqueous coating material for the production of monolayer and multilayer coloring and/or effect-giving enamels for primed and unprimed substrates.
Description
AQUEOUS COATING MATERIAL THAT CAN BE HARDENED PHYSICALLY, THERMALLY OR THERMALLY AND WITH ACTINIC RADIATION
AND THE UTILIZATION THEREOF
The present invention relates to a novel polyurethane-based aqueous coating material and to its use for producing single-coat and multicoat color and/or effect paint systems in automotive OEM finishing and automotive refinish, in industrial coating, including ' coil coating and container coating, in the coating of plastics, and in furniture coating.
Aqueous coating materials curable thermally and comprising a crosslinking agent, a color and/or effect pigment, and an ionically and/or nonionically stabilized polyurethane which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds and is based on aliphatic, cycloaliphatic, aliphatic-cycloaliphatic, aromatic, aliphatic-aromatic and/or cycloaliphatic-aromatic polyisocyanates, and the corresponding paint systems, are known, for example, from patent EP-A-O 089 497, DE-A-44 37 535, DE-C-197 22 862 or DE-A-196 45 761. These known aqueous coating materials, especially the aqueous basecoat materials, and the single-coat or multicoat color and/or effect paint systems produced with them possess very good performance properties.
AND THE UTILIZATION THEREOF
The present invention relates to a novel polyurethane-based aqueous coating material and to its use for producing single-coat and multicoat color and/or effect paint systems in automotive OEM finishing and automotive refinish, in industrial coating, including ' coil coating and container coating, in the coating of plastics, and in furniture coating.
Aqueous coating materials curable thermally and comprising a crosslinking agent, a color and/or effect pigment, and an ionically and/or nonionically stabilized polyurethane which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds and is based on aliphatic, cycloaliphatic, aliphatic-cycloaliphatic, aromatic, aliphatic-aromatic and/or cycloaliphatic-aromatic polyisocyanates, and the corresponding paint systems, are known, for example, from patent EP-A-O 089 497, DE-A-44 37 535, DE-C-197 22 862 or DE-A-196 45 761. These known aqueous coating materials, especially the aqueous basecoat materials, and the single-coat or multicoat color and/or effect paint systems produced with them possess very good performance properties.
Where the single-coat or multicoat color and effect paint systems produced from the known aqueous basecoat materials comprise effect pigments, especially metallic pigments, there may be formation of what are known as clouds, i.e., areas of.light/dark shading. These are an indicator of deficiencies in dispersing and/or orienting the color and/or effect pigments, especially the effect pigments, in the finish. However, it is precisely in the case of particularly high-value products having extensive finishes, such as auto-mobiles, for example, that cloudy finishes are funda-mentally unacceptable, since paint defects of this kind suggest low quality in the entire product (e.g., the automobile).
It is an object of the present invention to provide a novel aqueous coating material which is curable thermally, or thermally and with actinic radiation, and which is very highly suitable as an aqueous basecoat material or solid-color topcoat material for producing single-coat and multicoat color and effect paint systems which exhibit markedly reduced clouding tendency. Furthermore, the otherwise excellent performance properties of the existing aqueous basecoat materials and solid-color topcoat materials ought not to be impaired, but instead retained in their entirety.
Not least, the reduction in clouding ought also to accompany overcoating of the novel aqueous basecoat films with any of a wide variety of clearcoats.
It is an object of the present invention to provide a novel aqueous coating material which is curable thermally, or thermally and with actinic radiation, and which is very highly suitable as an aqueous basecoat material or solid-color topcoat material for producing single-coat and multicoat color and effect paint systems which exhibit markedly reduced clouding tendency. Furthermore, the otherwise excellent performance properties of the existing aqueous basecoat materials and solid-color topcoat materials ought not to be impaired, but instead retained in their entirety.
Not least, the reduction in clouding ought also to accompany overcoating of the novel aqueous basecoat films with any of a wide variety of clearcoats.
The invention accordingly provides a novel aqueous coating material curable physically, thermally, or both thermally with actinic radiation, which comprises:
A) at least one ionically and/or nonionically stabilized polyurethane which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds, as binder, B) at least one effect pigment or a mixture of a color pigment and an effect pigment, and C) at least one colorless, transparent or opaque powder which is substantially inert with respect to the other constituents of the coating material and whose particles have an average size of from 1.0 to 10.0 pm and a density of from 0.8 to 3.6 g cm-3r and is referred to below as the "coating material of the invention".
Further subject matter of the invention will emerge from the following description.
In the light of the prior art it was surprising and unforeseeable for the skilled worker that the object on which the present invention is based could be achieved by means of the specially selected powder (C) for use in accordance with the invention. Indeed, the expecta-tion was more that the use of powders (C) whose average particle size lies within the order of magnitude of the dry film thickness of the basecoats or solid-color topcoats produced from the coating materials of the invention would be accompanied by serious disadvan-tages, especially with regard to the quality of the overall appearance and the level of intercoat adhesion.
The coating material of the invention is physically curing.
In the context of the present invention, the term "physical curing" denotes the curing of a layer of a coating material by filming through loss of solvent from the coating material, with linking within the coating taking place via looping of the polymer molecules of the binders (regarding the term, cf. RSmpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "binders", pages 73 and 74).
Or else filming takes place by way of the coalescence of binder particles (cf. Rompp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "curing", pages 274 and 275). Normally, no crosslinking agents are required for this purpose.
Where appropriate physical curing may be assisted by atmospheric oxygen, by heat or by exposure to actinic radiation.
A) at least one ionically and/or nonionically stabilized polyurethane which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds, as binder, B) at least one effect pigment or a mixture of a color pigment and an effect pigment, and C) at least one colorless, transparent or opaque powder which is substantially inert with respect to the other constituents of the coating material and whose particles have an average size of from 1.0 to 10.0 pm and a density of from 0.8 to 3.6 g cm-3r and is referred to below as the "coating material of the invention".
Further subject matter of the invention will emerge from the following description.
In the light of the prior art it was surprising and unforeseeable for the skilled worker that the object on which the present invention is based could be achieved by means of the specially selected powder (C) for use in accordance with the invention. Indeed, the expecta-tion was more that the use of powders (C) whose average particle size lies within the order of magnitude of the dry film thickness of the basecoats or solid-color topcoats produced from the coating materials of the invention would be accompanied by serious disadvan-tages, especially with regard to the quality of the overall appearance and the level of intercoat adhesion.
The coating material of the invention is physically curing.
In the context of the present invention, the term "physical curing" denotes the curing of a layer of a coating material by filming through loss of solvent from the coating material, with linking within the coating taking place via looping of the polymer molecules of the binders (regarding the term, cf. RSmpp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "binders", pages 73 and 74).
Or else filming takes place by way of the coalescence of binder particles (cf. Rompp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "curing", pages 274 and 275). Normally, no crosslinking agents are required for this purpose.
Where appropriate physical curing may be assisted by atmospheric oxygen, by heat or by exposure to actinic radiation.
The coating material of the invention is thermally curable. in this context it may be self-crosslinking or externally crosslinking.
In the context of the present invention, the term "self-crosslinking" refers to the capacity of a binder to enter into crosslinking reactions with itself. A
prerequisite for this is that the binders already contain both kinds of complementary reactive functional groups which are necessary for crosslinking. Externally crosslinking coating materials, adhesives and sealing compounds, on the other hand, are those in which one kind of the complementary reactive functional groups is present in the binder and the other kind is present in a curing or crosslinking agent. For further details, refer to Rompp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "curing", pages 274 to 276, especially page 275, bottom.
The coating material of the invention is curable thermally and with actinic radiation. Where thermal curing and curing with actinic light are employed together in the context of one coating material, the terms "dual cure" and "dual-cure coating material" are also used.
In the context of the present invention, actinic radiation means electromagnetic radiation, such as visible light, UV radiation or X-rays, especially W
In the context of the present invention, the term "self-crosslinking" refers to the capacity of a binder to enter into crosslinking reactions with itself. A
prerequisite for this is that the binders already contain both kinds of complementary reactive functional groups which are necessary for crosslinking. Externally crosslinking coating materials, adhesives and sealing compounds, on the other hand, are those in which one kind of the complementary reactive functional groups is present in the binder and the other kind is present in a curing or crosslinking agent. For further details, refer to Rompp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "curing", pages 274 to 276, especially page 275, bottom.
The coating material of the invention is curable thermally and with actinic radiation. Where thermal curing and curing with actinic light are employed together in the context of one coating material, the terms "dual cure" and "dual-cure coating material" are also used.
In the context of the present invention, actinic radiation means electromagnetic radiation, such as visible light, UV radiation or X-rays, especially W
radiation, and corpuscular radiation, such as electron beams.
The coating material of the invention is a one-component (1K) system.
In the context of the present invention, a one-component (1K) system is a coating material curable thermally or thermally and with actinic radiation in which the binder and the crosslinking agent are present alongside one another, i.e., in one component. A
prerequisite for this is that the two constituents crosslink with one another only at relatively high temperatures and/or on exposure to actinic radiation.
The coating material of the invention may also= be a two-component (2K) or multicomponent (3K, 4K) system.
In the context of the present invention, this means a coating material in which in particular the binder and the crosslinking agent are present separately from one another in at least two components which are not combined until shortly before application. This form is chosen when binder and crosslinking agent react with one another even at room temperature. Coating materials of this kind are employed in particular for coating thermally sensitive substrates, especially in auto-motive refinish.
The coating material of the invention is a one-component (1K) system.
In the context of the present invention, a one-component (1K) system is a coating material curable thermally or thermally and with actinic radiation in which the binder and the crosslinking agent are present alongside one another, i.e., in one component. A
prerequisite for this is that the two constituents crosslink with one another only at relatively high temperatures and/or on exposure to actinic radiation.
The coating material of the invention may also= be a two-component (2K) or multicomponent (3K, 4K) system.
In the context of the present invention, this means a coating material in which in particular the binder and the crosslinking agent are present separately from one another in at least two components which are not combined until shortly before application. This form is chosen when binder and crosslinking agent react with one another even at room temperature. Coating materials of this kind are employed in particular for coating thermally sensitive substrates, especially in auto-motive refinish.
The coating material of the invention is aqueous. This means that its constituents are present in dispersion and/or solution in water or in a mixture of water and minor amounts of at least one water-miscible organic solvent. In this context, "minor amounts" are amounts which do not destroy the aqueous nature of the mixture.
The inventively essential constituent of the coating material of the invention is the powder (C). This powder (C) is a powder of uniform composition, i.e., its particles materially have the same composition. Or else it is a mixture of at least two powders (C). The decision as to which variant is given preference is guided by the requirements which are imposed on the coating material of the invention in the case in hand.
In the great majority of cases, the use of one powder (C) is sufficient to achieve the advantages according to the invention.
The powder (C) for use in accordance with the invention is colorless. This means that it has no hue and no chroma but only lightness. Accordingly, it is white or has a gray shade. Preferably, however, it is white. For further details, refer to Rompp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "achromatic point", page 590.
The inventively essential constituent of the coating material of the invention is the powder (C). This powder (C) is a powder of uniform composition, i.e., its particles materially have the same composition. Or else it is a mixture of at least two powders (C). The decision as to which variant is given preference is guided by the requirements which are imposed on the coating material of the invention in the case in hand.
In the great majority of cases, the use of one powder (C) is sufficient to achieve the advantages according to the invention.
The powder (C) for use in accordance with the invention is colorless. This means that it has no hue and no chroma but only lightness. Accordingly, it is white or has a gray shade. Preferably, however, it is white. For further details, refer to Rompp Lexikon Lacke und Druckfarben, Georg Thieme Verlag, Stuttgart, New York, 1998, "achromatic point", page 590.
The powder (C) is transparent in the sense of clear or opaque in the sense of hiding. Preference is given to using transparent powders (C).
The powder (C) is substantially inert. This means that, within the period of time commonly envisaged for the preparation, storage, and processing of the coating material of the invention, it is soluble only sparingly if at all in water and in the organic solvents possibly still present in the coating material of the invention, does. not absorb any major constituents of the coating material or cause them to flocculate, does not enter into any chemical reactions, or enters into only very slowly proceeding chemical reactions, with essential constituents of the coating material, does not catalyze any chemical reactions between the essential constituents of the coating material, and is unaltered, or altered only very slowly, in its properties by heat and/or actinic light.
The powder (C) has an average particle size of from 1.0 to 10.0, preferably from 3.0 to 7.5, and in particular from 4.0 to 7.0 m.
Advantageous powders (C) have a comparatively narrow particle size distribution. In other words, the frac-tions both of fine material and of coarse material are comparatively low. Particularly advantageous powders c =
The powder (C) is substantially inert. This means that, within the period of time commonly envisaged for the preparation, storage, and processing of the coating material of the invention, it is soluble only sparingly if at all in water and in the organic solvents possibly still present in the coating material of the invention, does. not absorb any major constituents of the coating material or cause them to flocculate, does not enter into any chemical reactions, or enters into only very slowly proceeding chemical reactions, with essential constituents of the coating material, does not catalyze any chemical reactions between the essential constituents of the coating material, and is unaltered, or altered only very slowly, in its properties by heat and/or actinic light.
The powder (C) has an average particle size of from 1.0 to 10.0, preferably from 3.0 to 7.5, and in particular from 4.0 to 7.0 m.
Advantageous powders (C) have a comparatively narrow particle size distribution. In other words, the frac-tions both of fine material and of coarse material are comparatively low. Particularly advantageous powders c =
(C) have a maximum particle size of below 12, prefer-ably below 11 and in particular below 10 m.
The particles of the powder (C) for use in accordance with the invention have a density of from 0.8 to 3.6, preferably from 0.9 to 3.4, more preferably from 1.0 to 3.2, and in particular from 1.1 to 3.0 g cm3.
In certain cases it would also be possible to use particles having a lower density; in that case, however, the risk exists of the particles floating in the coating materials on prolonged storage.
Alternatively, it would also be possible in certain cases to use particles having a higher density;.in that case, however, the risk exists of the particles settling fairly rapidly on prolonged storage.
The particles of the powders (C) for use in accordance with the invention may be of any desired shape. In accordance with the invention it is of advantage if they have a spherical shape. In. the context of the present invention, a spherical shape is a shape sub-stantially like that of a ball. Examples of spherical shapes are beads, egg-shaped particles, dodecahedra or icosahedra, which may also have certain irregularities.
Examples of suitable substances of which the particles or powders (C) may consist are crosslinked or uncross-linked, organic or organometallic polymers, inorganic minerals, salts or ceramic materials, or organically modified ceramic materials, or mixtures of these substances. Of these, the inorganic minerals are of advantage and are therefore used with preference. These minerals may be natural minerals or synthetic minerals.
Examples of the highly suitable minerals are silicon dioxide, aluminum silicates, calcium silicates, magnesium silicates, calcium aluminum silicates, magnesium aluminum silicates, calcium magnesium silicates, calcium magnesium aluminum silicates, beryllium aluminum silicates, aluminum phosphate or calcium phosphate, or mixtures thereof. Of these, silicon dioxide is particularly advantageous and is therefore used with particular preference in accordance with the invention.
The preparation of the powders (C) for use in accor-dance with the invention has no special features in terms of its method but instead takes place with the aid of methods such as are.customary and known in the field of organic, organometallic .or inorganic chernistry. For example, organic . polymers may be produced by emulsion, dispersion or precipitation polymerization or by size reduction, for example by grinding or spraying, of melts or solutions of ready-produced polymers. The inorganic particles may be.
produced, for example, by precipitation processes and/or size reduction. In the case of ceramic = 11 -materials, it is normal first to produce a green. body, which may already have the desired powder form, and then to fire it.
Where appropriate, the surfaces of the particles are subjected to an aftertreatment, for example, to a hydrophilicizing or hydrophobicizing treatment. How-ever, the aftertreatment must not remove the inertness of the particles.
The powders (C) may be incorporated as they are into the coating materials of the invention, provided they are readily dispersed and do not agglomerate. In accor-dance with the invention it is of advantage if the powders (C) are incorporated in the form of powder pastes. Further advantages result if the paste resins or grinding resins used comprise binders which are present in the coating material of the invention.
The amount of the powders (C) in the coating materials of the invention may vary very widely and is guided primarily by the intensity of the light/dark shading that is to be avoided and by the specified shade of the color and effect coating which is produced from the respective coating material of the invention. It is preferred to employ from 0.09 to 5.0%, more preferably from 0.12 to 3.5%, and in particular from 0.3 to 2.5%
by weight, based in each case on the solids content of the coating material of the invention.
The further essential constituent of the coating material of the invention is at least one binder (A).
In accordance with the invention, said binder (A) comprises at least one ionically and/or nonionically stabilized polyurethane (A) which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds.
Advantageously, depending on the nature of the stabilization, the polyurethane (A) for inventive use has an acid number or amine number of from 10 to 250 mg KOH/g (ionic stabilization or nonionic plus ionic stabilization) or of from 0 to 10 mg KOH/g (nonionic stabilization), an OH number of from 30 to 350 mg KOH/g, and a number average molecular weight of from 1500 to 100,000 daltons.
The method of preparing the polyurethane (A) is arbitrary. It is preferably obtainable by preparing, in a first process step, a polyurethane prepolymer which contains at least one free isocyanate group..
The polyurethane prepolymer is of linear, branched or comb, but especially linear, construction. In this context the linear polyurethane prepolymer includes preferably two free isocyanate groups, especially two terminal free isocyanate groups. The branched or comb-constructed polyurethane prepolymers include preferably at least two, in particular more than two, free isocyanate groups, terminal free isocyanate groups being preferred.
In terms of inethod,. the preparation of the polyurethane prepolymers for use in accordarice with the invention has no special features but instead takes place, for example, as described in patent DE-C-197 22 862 , DE-A-196 45 761, DE-A-44 37 535, EP-A-0 522 419 or EP-A-0 522 420, by reaction of at least one polyol, especially a diol, with at least one polyisocyanate, especially a diisocyanate, the isocyanate component being employed in a molar excess so as to give terminal free isocyanate groups.
For the preparation of the polyurethane prepolymers it is preferred to use diisocyanates and also, if desired, in minor amounts, polyisocyanates, for the purpose of introducing branches. In the context of the present invention, minor amounts are amounts which do not cause gelling of the polyurethane prepolymers during their preparation. This may also be prevented by using small amounts of monoisocyanates.
Examples of suitable diisocyanates are isophorone diisocyanate (i.e., 5-isocyanato-l-isocyanatomethyl-1,3,3-trimethylcyclohexane), 5-isocyanato-l-(2-isocya-natoeth-1-yl)-1,3,3-trimethylcyclohexane, 5-isocyanato-1-(3-isocyanatoprop-1-yl)-1,3,3-trimethylcyclohexane, 5-isocyanato-(4-isocyanatobut-1-yl)-1,3,3-trimethyl-cyclohexane, 1-isocyanato-2-(3-isocyanatoprop-l-yl)cyclohexane, 1-isocyanato-2-(3-isocyanatoeth-1-yl)-cyclohexane, 1-isocyanato-2-(4-isocyanatobut-1-yl)-.cyclohexane, 1,2-diisocyanatocyclobutane, 1,3-diiso-cyanatocyclobutane, 1,2-diisocyanatocyclopentane, 1,3-diisocyanatocyclopentane, 1,2-diisocyanatocyclohexane, 1,3-diisocyanatocyclohexane, .1,4-diisocyanatocyclo-hexane, dicyclohexylmethane 2,4'-diisocyanate, tri-methylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diiso-cyanate, ethylethylene diisocyanate, trimethyihexane diisocyanate, heptamethylene diisocyanate or diiso-cyanates derived from dimeric fatty acids, as marketed under the commercial designation DDI 1410 by the company Henkel and described in the patents WO 97/49745 and WO 97/49747, especially 2-heptyl-3,4-bis(9-isocyanatononyl)-1-pentylcyclohexane, or 1,2-, 1,4- or 1,3-bis(isocyanatomethyl)cyclohexane, 1,2-, 1,4- or 1,3-bis(2-isocyanatoeth-1-yl)cyclohexane, 1,3-bis(3~
isocyanatoprop-1-yl)cyclohexane, 1,2-, 1,4- or 1,3-bis-(4-isocyanatobut-1-yl)cyclohexane, liquid bis(4-iso-cyanatocyclohexyl)methane with a trans/trans content of up to 30% by weight, preferably 25% by weight, and in particular 20% by weight, as is described by the patents DE-A-44 14 032, GB-A-1220717, DE-A-16 18 795 or DE-A-17 93 785; tetramethylxylylidene diisocyanate (TMXDI from CYTEC), tolylene diisocyanate, xylylene diisocyanate, bisphenylene dii.socyanate, naphthylene diisocyanate or diphenylmethane diisocyanate.
Examples of suitable polyisocyanates based on the diisocyanates described above are isocyanato-containing polyurethane prepolymers, which have been prepared by reacting polyols with an excess bf at least one of the above-described diisocyanates, and/or polyisocyanates containing isocyanurate, biuret, allophanate, iminooxadiazinedione, urethane, urea and/or uretdione groups. It is preferred to use polyisocyanates containing on average from 2.5 to 5 isocyanate groups per molecule and having viscosities of from 100 to 10 000, preferably from 100 to 5000 mPas. Furthermore, the polyisocyanates may have been subjected to conventional hydrophilic or hydrophobic modification.
Very particular preference is given to mixtures of polyisocyanates which contain uretdione and/or isocyanurate and/or allophanate groups and which are based on the above-described diisocyanates as formed by catalytic oligomerization of diisocyanates using appropriate catalysts.
Examples of suitable monoisocyanates are phenyl isocyanate, cyclohexyl isocyanate ' or stearyl iso-cyanate, or vinyl isocyanate, methacryloyl isocyanate, and/or 1-(1-isocyanato-l-methylethyl)-3-(1-methyl-ethenyl)benzene (TMI(D from CYTEC).
Examples of suitable polyols are saturated or olefinically unsaturated polyesterpolyols which are prepared by reacting -unsulfonated or sulfonated saturated and/or unsaturated polycarboxylib acids or their esterifiable derivatives, alone or together with monocarboxylic acids, and - saturated and/or unsaturated polyols, alone or together with monools.
Examples of suitable polycarboxylic acids are aromatic, aliphatic and cycloaliphatic polycarboxylic acids.
Preference is given to the use of aromatic and/or aliphatic polycarboxylic ac-Lds.
Examples of suitable aromatic polycarboxylic acids are' phthalic acid, isophthalic acid, terephthalic acid, phthalic, isophthalic or terephthalic acid monosulfonate, or halophthalic acids, such as tetrachlorophthalic or tetrabromophthalic acid, among which isophthalic acid is advantageous and is therefore used with preference.
Examples of suitable acyclic aliphatic or unsaturated polycarboxylic acids are oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic ~ 17 -acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid or dodecanedicarboxylic acid, or dimeric fatty acids or maleic acid, fumaric acid or itaconic acid, of which adipic acid, glutaric acid, azelaic acid, sebacic acid, dimeric fatty acids and maleic acid are advantageous and are therefore used with preference.
Examples of suitable cycloaliphatic and cyclic unsaturated polycarboxylic acids are 1,2-cyclobutanedi-carboxylic acid, 1,3-cyclobutanedicarboxylic acid, 1,2-cyclopentanedicarboxylic acid, 1,3-cyclo-pentanedicarboxylic acid, hexahydrophthalic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicar-boxylic acid, 4-methylhexahydrophthalic acid, tricyclo-decanedicarboxylic acid, tetrahydrophthalic acid or 4-methyltetrahydrophthalic acid. These dicarboxylic acids may be used both in their cis and in their trans form and also as a mixture of both forms.
Also suitable are the esterifiable derivatives of the abovementioned polycarboxylic acids, such as their monoesters or polyesters with aliphatic alcohols having 1 to 4 carbon atoms or hydroxy alcohols having 1 to 4 carbon atoms, for example. It is also possible to use the anhydrides of the abovementioned polycarboxylic acids, where they exist. .
Together with the polycarboxylic acids it is also possible if desired to use monocarboxylic acids, such as, for example, benzoic acid, tert-butylbenzoic acid, lauric acid, isononanoic acid, fatty acids of naturally occurring oils, acrylic acid, methacrylic acid, ethacrylic acid or crotonic acid. The preferred monocarboxylic acid used is isononanoic acid.
Examples of suitable polyols are diols and triols, especially diols. Normally, triols are used alongside the diols in minor amounts in order to introduce branches into the polyester polyols.
Suitable diols are ethylene glycol, 1,2- or 1,-3-propanediol, 1,2-, 1,3- or 1,4-butanediol, 1,2-, 1,3-, 1,4- or 1,5-pentanediol, 1,2-, 1,3-, 1,4-, 1,5- or 1,6-hexanediol, neopentyl hydroxypivalate, neopentyl glycol, diethylene glycol, 1,2-, 1,3- or 1,4-cyclo-hexanediol, 1,2-, 1,3- or 1,4-cyclohexanedimethanol, trimethylpentanediol, ethylbutylpropanediol, the positionally isomeric diethyloctanediols- 2-butyl-2-ethyl-1,3-propanediol, 2-butyl-2-methyl-1,3-propane-diol, 2-phenyl-2-methyl-1,3-propanediol, 2-propyl-2-ethyl-1,3-propanediol, 2-di-tert-butyl-1,3-propanediol, 2-butyl-2-propyl-1,3-propanediol, 1-dihydroxymethyl-bicyclo[2.2.1]heptane, 2,2=diethyl-1,3-propanediol, 2,2-dipropyl-1,3-propanediol 2-cyclohexyl-2-methyl-1,3-propanediol, 2,5-dimethyl-2,5-hexanediol, 2,5-diethyl-2,5-hexanediol, 2-ethyl-5-methyl-2,5-hexanediol, 2,4-dimethyl-2,4-pentanediol, 2,3-dimethyl-2,3-butanediol, 1,4-bis(2'-hydroxypropyl)benzene and 1,3-bis(2'-hydroxypropyl)benzene.
These diols may also be used per se for the preparation of the polyurethanes (A) for inventive use.
Of these diols, hexanediol and neopentyl glycol are particularly advantageous and are therefore used with particular preference.
Examples of suitable triols are trimethylolethane, trimethylolpropane or glycerol, especially trimethyloipropane.
The abovementioned triols may also be used per se to prepare the polyurethanes (A) for inventive use (cf.
patent EP-A-0 339 433).
If desired, minor amounts of monools may also be used.
Examples of suitable monools are alcohols or phenols.
such as ethanol, propanol, n-butanol, sec=butanol, tert-butanol, amyl alcohols, hexanols, fatty alcohols, allyl alcohol, or phenol.
The polyesterpolyols may be prepared in the presence of small amounts of a suitable solvent as entrainer.
Examples of entrainers used are aromatic hydrocarbons,, such as especially xylene and (cyclo)aliphatic hydrocarbons, e.g., cyclohexane or methylcyclohexane.
Further examples of suitable polyols are polyesterdiols which are obtained by reacting a lactone with a diol.
They are notable for the presence of terminal hydroxyl groups and repeating polyester fractions of the formula -(-CO-(CHR)m CH2-O-)-. Here, the index m is preferably from 4 to 6 and the substituent R is hydrogen or an alkyl, cycloalkyl, or alkoxy radical. No substituent contains more than 12 carbon atoms. The total number of carbon atoms in the substituent does not exceed 12 per lactone ring. . Examples are hydroxycaproic acid, hydroxybutyric acid, hydroxydecanoic acid, and/or hydroxystearic acid.
Preferred for the preparation of the polyesterdiols is the unsubstituted E-caprolactone, where m is 4 and all substituents R are hydrogen. The reaction with lactone is started by low molecular mass polyols such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, or dimethylolcyclohexane. It is also possible, however, to react other reaction components, such as ethylenediamine, alkyldialkanolamines, or else urea, with caprolactone. Other suitable diols of relatively high.molecular mass are polylactamdiols, which are prepared by reacting, for example, E-caprolactam with low molecular mass diols.
Further examples of suitable polyols include polyetherpolyols, especially those having a number-average molecular weight of from 400 to 5000, in particular from 400 to 3000. Examples of highly suitable polyetherdiols are polyetherdiols of the general formula H- (-0- ( CHRl ) o- ) pOH, where the substituent R1 is hydrogen or a lower, unsubstituted or substituted alkyl radical, the index o is from 2 to 6, preferably from 3 to 4, and the index p is from 2 to 100, preferably from 5 to 50. Especially suitable examples are linear or branched polyetherdiols such as poly(oxyethylene) glycols, poly(oxypropylene) glycols, and poly(oxybutylene) glycols.
The polyetherdiols should, firstly, not introduce excessive amounts of ether groups, since otherwise the polyurethanes (A) for inventive use that are formed start to swell in water. Secondly, they may be used in amounts which ensure the nonionic stabilization of the polyurethanes (A). In that case they act as the functional nonionic groups (a3) described below.
The polyurethane (A) for inventive use comprises alternatively (al) functional groups convertible into cations by neutralizing agents and/or quaternizing agents, and/or cationic groups, or (a2) functional groups convertible into anions by neutralizing agents, and/or anionic groups, and/or (a3) nonionic hydrophilic groups.
Examples of suitable functional groups (al) for inventive use which are convertible into cations by neutralizing agents and/or quaternizing agents are primary, secondary or tertiary amino groups, secondary sulfide groups or tertiary phosphine groups, especially tertiary amino groups or secondary sulfide groups.
Examples of suitable cationic groups (al) for inventive use are primary, secondary, tertiary or quaternary amanonium groups, tertiary. sulfonium groups or quaternary phosphonium groups, preferably quaternary ammonium groups, quaternary phosphorium groups or tertiary sulfonium groups, but especially tertiary sulfonium groups.
Examples of suitable functional groups (a2) for inventive. use which are ~convertible into anions by neutralizing agents are carboxylic acid, sulfonic acid or phosphonic acid groups, especially carboxylic acid groups.
Examples of suitable anionic groups (a2) for inventive use are carboxylate, sulfonate or phosphonate groups, especially carboxylate groups.
Examples of suitable neutralizing agents for the functional groups (al) convertible into cations are organic and inorganic acids such as formic acid, acetic acid, lactic acid, dimethylolpropionic acid, citric acid, sulfuric acid, hydrochloric acid, and phosphoric acid.
Examples of suitable .neutralizing agents for the functional groups (a2) convertible into anions, are ammonia, ammonium salts, such as ammonium carbonate or ammonium bicarbonate for example, and also amines, such as trimethylamine, triethylamine, tributylamine, dimethylaniline, diethylaniline, triphenylamine, dimethylethanolamine, diethylethanolamine, methyldi-ethanolamine, triethanolamine and the like, for example. Neutralization may take place in organic phase or in aqueous phase. A preferred neutralizing agent used is dimethylethanolamine.
The amount of neutralizing agent used overall in the coating composition of the invention is chosen so that from 1 to 100 equivalents, preferably from 50 to 90 equivalents, of the functional groups (al) or (a2) of the polyurethane (A) for inventive use are neutralized.
The introduction of hydrophilic functional (potentially) cationic groups (a1) into the polyurethane prepolymers takes place by way of the incorporation of compounds which contain in the molecule at least one, especially two, isocyanate-reactive groups and at least one group which is capable of forming cations; the amount to be used may be calculated from the target amine number.
Suitable isocyanate-reactive groups are, in particular, hydroxyl groups and also primary and/or secondary amino groups, of which the hydroxyl groups are used with preference.
Examples of suitable compounds are 2,2-dimethylol-ethylamine or -propylamine blocked with a ketone, the resulting ketoxime group being hydrolyzed again before the cationic group (a1) is formed, or N,N-dimethyl-, N,N-diethyl- or..N-methyl-N-ethyl-2,2-dimethylolethyl-or. -propylamine.
The introduction of (potentially) anionic groups (a2) into the polyurethane molecules takes place by way of the incorporation of compounds which contain in the molecule at least one isocyanate-reactive group and at least one group capable of forming anions; the amount to be. used may be calculated from the target acid number.
Examples of suitable compounds of this kind are those containing two isocyanate-reactive groups in the molecule. Suitable isocyanate-reactive groups are those described above. Accordingly it is possible, for example, to use alkanoic acids having two substituents on the a carbon atom. The substituent may be a hydroxyl group, an alkyl group, or, preferably, an alkylol group. These alkanoic acids have at least one, generally from 1 to 3, carboxyl groups in the molecule.
They have 2 to about 25, preferably 3 to 10, carbon atoms. Examples of suitable alkanoic 'acids are dihydroxypropionic acid, dihydroxysuccinic acid, and dihydroxybenzoic acid. A particularly preferred group of alkanoic acids are the a,oc-dimethylolalkanoic acids of the general formula Ra-C (CHZOH) 2COOH, R2 being a hydrogen atom or an alkyl group having up to about 20 carbon atoms. Examples of especially suitable alkanoic acids are 2,2-dimethylolacetic acid, 2,2-dimethylol-propionic acid, 2,2-dimethylolbutyric acid, and 2,2-dimethylolpentanoic acid. The preferred dihydroxy-alkanoic acid is 2,2-dimethylolpropionic acid. Examples of compounds containing amino groups are oc,S-diaminovaleric acid, 3,4-diaminobenzoic acid, 2,4-diaminotoluenesulfonic acid, and 2,4-diaminodiphenyl ether sulfonic acid.
Nonionic stabilizing poly(oxyalkylene) groups (a3) may be introduced as lateral or terminal groups into the polyurethane molecules. For this purpose it is possible to use, for example, alkoxypoly(oxyalkylene) alcohols having the general formula R3O- (-CH2-CHR4-0- )H, where R3 is an alkyl radical having 1 to 6 carbon atoms, R4 is a hydrogen atom or an alkyl radical having 1 to 6 carbon atoms, and the index r is a number between 20 and 75 (cf. patents EP-A-0 354 261 or Ep-A-O 424 705).
Of these functional (potentially) ionic groups (al) and (a2) and functional nonionic groups (a3), the (potentially) anionic groups (a2) are advantageous and are therefore used with particular preference.
The use of polyols, polyamines and amino alcohols brings about an increase in the molecular weight of the polyurethane prepolymers (A).
Suitable polyols for the chain extension are polyols having up to 36 carbon atoms per molecule, such as ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2--butylene glycol, 1,6-hexanediol, trimethylolpropane, castor oil or ..hydrogenated castor oil, ditrimethylolpropane ether, pentaerythritol, 1,2-cyclohexanediol, 1,4-cyclohexanedimethanol, bisphenol A, bisphenol F, neopentyl glycol, neopentyl glycol hydroxypivalate, hydroxyethylated or hydroxypropylated bisphenol A, hydrogenated bisphenol A. or mixtures thereof (cf. patents EP-A-0 339 433, .EP-A-0 436 941, EP-A-0 517 707).
Examples of suitable polyamines have at least two primary and/or secondary amino groups. Polyamines are essentially alkylene polyamines having 1 to 40 carbon atoms, preferably about 2 to 15 carbon atoms. They may carry substituents which have no hydrogen atoms that are reactive with isocyanate groups. Examples are polyamines having a linear or branched aliphatic, cycloaliphatic or aromatic structure and at least two primary amino groups.
Diamines include hydrazine, ethylenediamine, propylenediamine, 1,4-butylenediamine, piperazine, 1,4-cyclohexyldimethylamine, 1,6-hexamethylenediamine, trimethylhexamethylenediamine, methanediamine, iso-phoronediamine, 4,4'-diaminodicyclohexylmethane, and aminoethyleneethanolamine. Preferred diamines are hydrazine, alkyl- or cycloalkyldiamines such as propylenediamine and 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane.
It is also possible to use polyamines containing more than two amino groups in the molecule. In these cases, however, it should be ensured - for example, by using monoamines as well - that no crosslinked polyurethane resins are obtained. Polyamines of this kind which may be used are diethylenetriamine, triethylenetetramine, dipropylenediamine, and dibutylenetriamine. An example of a monoamine is ethylhexylamine (cf. patent EP-A-0 089 497).
Examples of suitable amino alcohols are ethanolamine and diethanolamine.
The polyurethanes (A) for inventive use may contain terminal and/or lateral olefinically unsaturated groups. Groups of this kind may be introduced, for example, with the aid of compounds containing at least one isocyanate-reactive group, especially hydroxyl group, and at least one vinyl group. Examples of puitable compounds of this kind are trimethylolpropane monoallyl ether and trimethylolpropane mono(meth)-acrylate.
The polyurethanes (A) for inventive use may be grafted with ethylenically unsaturated compounds. Examples of suitable polyurethanes (A) for inventive use, in the form of graft copolymers, are known from patents EP-A-0 521 928, EP-A-0 522 420, EP-A-0 522 419 or EP-A-O 730 613.
The method of preparing the polyurethanes (A) for inventive use has no special features but instead takes place in accordance with the customary and known methods such as those described in the prior art cited at the outset.
The proportion of the polyurethanes (A) for inventive use in the coating materials of the invention may vary likewise extremely widely and is guided primarily by the intended use of the coating materials. Where the coating materials of the invention are curable thermally or both thermally and with actinic radiation, the amount is guided in particular by the functionality of the polyurethanes (A) with respect to the crosslinking reaction with the crosslinking agent (D).
In accordance with the invention it is of advantage to use the amounts as described in the prior art cited at the outset. It is preferred to use from 10 to 80%, with particular preference from 15 to 70%, and in particular from 20 to 60% by weight, based in each case on the solids content of the coating material of the invention.
The third essential constituent of the coating material of the invention is at least one color and/or effect pigment, especially.an effect pigment (B).
The pigments (B) may comprise organic or inorganic compounds. On the basis of this large number of appropriate pigments (B), therefore, the coating material, especially the aqueous basecoat and solid-color topcoat material, particularly the aqueous basecoat material, of the invention ensures a universal breadth of application and permits the realization of a large number of color shades and optical effects.
Effect pigments (B) which may be used include metal flake pigments such as commercial aluminum bronzes, aluminum bronzes chromated in accordance with DE-A-36 36 183, and commercial stainless steel bronzes, and also nonmetallic effect pigments, such as pearlescent pigments and interference pigments, for example. For further details, reference is made to Rompp, op. cit., page 176, "effect pigments", and pages 380 and 381 "metal oxide-mica pigments" to "metal pigments".
Examples of suitable inorganic color pigments (B) are titanium dioxide, iron oxides, sicotrans yellow, and carbon black. Examples of suitable organic color pigments are thioindigo pigments, indanthrene blue, Cromophthal red, Irgazine orange and Heliogen green.
For further details, reference is made to Rompp, op.
cit., pages 180 and 181, "iron blue pigments" to "black iron oxide", pages 451 to 453 "pigments" to "pigment volume concentration", page 563 "thioindigo pigments", and page 567 "titanium dioxide pigments".
The pigments (B) may be incorporated as they are into the coating material of the invention, provided they can be easily dispersed and do not agglomerate and/or their form, responsible for the optical effects, is not damaged or destroyed. it is of advantage in accordance with the invention for the pigments (B) to be incorporated in the form of pigment pastes. Further advantages result if the paste resins or grinding resins used are binders which are present in the coating material of the invention.
The pigment (B) content of the coating material of the invention may vary extremely widely and is guided primarily by the opacity of the pigments, the desired shade, and the desired optical effect. In the coating material of the invention, the pigments (B) are present in an amount of preferably from 0.1 to 50, more preferably from 0.5 to 45, with particular preference from 0.5 to 40, with very particular preference from 0.5 to 35, and in particular from 0.5 to 30% by weight, based in each case on the solids content of the coating material of the invention.
Besides the above-described constituents (A), (B) and (C), the coating material of the invention may comprise at least one solid, liquid or gaseous, organic and/or inorganic additive (D) of low and/or high molecular mass.
Examples of suitable additives (D) for coating materials of the invention that are curable thermally and those curable both thermally and with actinic radiation are crosslinking agents (D) such as nonblocked polyisocyanates, especially the partly or fully blocked polyisocyanates described above, and particularly those derived from the ones described above, amino resins, resins or compounds containing anhydride groups, resins or compounds containing epoxide groups, tris(alkoxycarbonylamino)triazines, resins or compounds containing carbonate groups, beta-hydroxyalkylamides, and compounds containing on average at least two groups capable of transesterification, examples being reaction products of malonic diesters and polyisocyanates or of esters and partial esters of polyhydric alcohols of malonic acid with monoiso-cyanates, as described in European patent EP-A-O 596 460. Crosslinking agents of this kind are well known to the skilled worker and are offered as commercial products by numerous companies.
Depending on the reactivity of the crosslinking agent (D), it may be added directly to the coating materials of the invention, producing what is known as a one-component system. If, however, it is a particularly reactive crosslinking agent (D), such as a polyisocyanate or an epoxide, it is generally not added to the coating materials of the invention until shortly before use. The result in this case is what is known as a two-component or multicomponent system.
Where the coating materials of the invention are to be curable not only thermally but also with actinic radiation (dual cure), they further comprise customary and known additives (D) which can be activated with actinic radiation. With particular preference, UV light is employed. Examples of suitable additives (D) which can be activated with actinic radiation are (meth)acryloyl-, allyl-, vinyl- or dicyclopentadienyl-functional (meth)acrylate copolymers or polyether acrylates, polyester acrylates, unsaturated polyester acrylates, epoxy acrylates, urethane acrylates, amino acrylates, melamine acrylates, silicone acrylates, or the corresponding methacrylates.
The coating material of the invention may further comprise reactive diluents (D) for the thermal, curing or for the curing with actinic radiation.
Examples of suitable reactive diluents (D) for thermal curing are oligomeric polyols (D) obtainable by hydroformylation and subsequent hydrogenation from oligomeric intermediates themselves obtained by metathesis. reactions of acyclic monoolefins and cyclic monoolefins; examples of suitable cyclic monoolefins are cyclobutene, cyclopentene, cyclohexene, cyclo-octene, cycloheptene, norbornene and 7-oxanorbornene;
examples of suitable acyclic rnonoolefins are contained in hydrocarbon mixtures which are obtained in petroleum processing by cracking (C5 cut); examples of suitable oligomeric polyols for use in accordance with the invention have a hydroxyl number of from 200 to 450, a number average molecular weight Mn of from 400 to 1000, and a mass average molecular weight Mw of from 600 to 1100.
Further examples of suitable polyols (D) are branched, cyclic and/or acyclic C9-C16 alkanes functionalized with at least two hydroxyl groups, especially diethyloctanediols.
Further examples of polyols (D) for use are hyperbranched compounds having a tetrafunctional central group, derived from ditrimethylolpropane, diglycerol, ditrimethylolethane, pentaerythritol, tetrakis(2-hydroxyethyl)methane, tetrakis(3-hydroxy-propyl)methane or 2,2-bishydroxymethyl-l,4-butanediol (homopentaerythritol). These reactive diluents may be prepared by the customary and known methods of preparing hyperbranched and dendrimeric compounds.
Suitable synthesis methods are described, for example, in patents WO 93/17060 or WO 96/12754, or in the book by G. R. -Newkome, C. N. Moorefield and F., Vogtle, "Dendritic Molecules, Concepts, Syntheses, PerspectivesN, VCH, Weinheim, New York, 1996.
Suitable radiation-curable reactive diluents (D) include polyfunctional, ethylenically unsaturated compounds of low molecular mass. Examples of suitable such compounds are esters of acrylic acid with polyols, such as neopentyl glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate or pentaerythritol tetraacrylate; or reaction products of hydroxyalkyl acrylates with polyisocyanates, especially aliphatic polyisocyanates.
Additionally to or instead--of the above-described additives (D), the coating material of the invention may comprise customary and known binders (D).
Examples of customary and known binders (D) are oligomeric and polymeric poly(meth)acrylates or acrylate copolymers that are of linear and/or branched and/or block, comb and/or random construction, especially those described in patent DE-A-197 36 535, DE-A-44 37 535 or DE-A-197 41 554; polyesters, especially those described in patent DE-A-40 09 858 or DE-A-44 37 535; alkyds, acrylated polyesters, polylactones, polycarbonates, polyethers, epoxy resin-amine adducts, (meth)acrylatediols, partially hydrolyzed polyvinyl esters, or polyureas,-o.f which the acrylate copolymers and/or the polyesters are particularly advantageous.
The coating material of the invention may otherwise comprise customary coatings additives (D) in effective amounts. The nature and amount of the additives (D) are guided in particular by the intended use of the coating material of the invention.
Examples of suitable additives (D) are:
- organic and inorganic fillers such as chalk, calcium sulfates, barium sulfate, silicates such as talc or kaolin, silicas, oxides such as aluminum hydroxide or magnesium hydroxide, nanoparticles, or organic fillers such as textile fibers, cellulose fibers, polyethylene fibers or wood flour;
- UV absorbers;
- free-radical scavengers;
- crosslinking catalysts;
- slip additives;
- polymerization inhibitors;
- defoamers;
- emulsifiers, especially nonionic emulsifiers such as alkoxylated alkanols, polyols, phenols and alkylphenols or anionic emulsifiers such as alkali metal salts or ammonium salts of alkanecarboxylic acids, alkanesulfonic acids and sulfo acids of alkoxylated alkanols, polyols, phenols and alkylphenols;
- wetting agents such as siloxanes, fluorine compounds, carboxylic monoesters, phosphates, polyacrylic acids and their copolymers., or polyurethanes;
- adhesion promoters;
- leveling agents;
- film-forming auxiliaries such as cellulose derivatives;
- flame retardants;
- rheology control additives, such as those known from the patents WO 94/22968, EP-A-0 276 501 EP-A-0 249 201, WO 97/12945; crosslinked polymeric microparticles, as disclosed for example in EP-A-0 008 127; inorganic phyllosilicates, such as aluminum-magnesium silicates, sodium-magnesium and sodium-magnesium-fluorine-lithium phyllosilicates of the montmorillonite type; silicas such as Aerosils; or synthetic polymers containing ionic and/or associative groups, such as polyvinyl alcohol, poly(meth)acrylamide, poly(meth)acrylic acid, polyvinylpyrrolidone, styrene-maleic anhydride or ethylene-maleic anhydride copolymers and their derivatives or hydrophobically modified ethoxylated urethanes or polyacrylates; or - water-miscible low-boiling and high-boiling organic solvents ("long solvents");
- photoinitiators, such as photoinitiators of the Norrish II type, whose mechanism of action is based on an intramolecular variant of the hydrogen abstraction reactions as occur diversely in the case of photochemical reactions; by way of example, reference may be made here to Rbmpp Chemie Lexikon, 9th, expanded and revised edition, Georg Thieme Verlag, Stuttgart, Vol. 4, 1991.
Further examples of suitable coatings additives (D) are described in the textbook "Lackadditive" [Additives for coatings] by Johan Bieleman, Wiley-VCH, Weinheim, New York, 1998.
Viewed in terms of its method, the preparation of the coating material of the invention has no special features but instead takes place by the dispersing of its constituents in water, in which context it is possible. to employ primary or secondary dispersion methods and also customary and known mixing equipment such as stirred tanks, dissolvers, stirred mills, . or extruders. For example, refer to the prior art cited at the outset.
The coating material of the invention, especially the aqueous basecoat material of the invention, is outstandingly suitable for producing multicoat color and/or effect paint systems on primed and unprimed substrates by the wet-on-wet= technique. Additionally, the coating material, especially solid-color topcoat material, of the invention is outstandingly suitable for producing single-coat color and/or effect paint systems.
The coating material of the invention may also be used, furthermore, as an adhesive =or sealing compound or as a starting product for producing self-supporting paint films.
The coating material of the invention exhibits particular advantages in its use as an aqueous basecoat material as part of the wet-on-wet technique, wherein the aqueous basecoat material is applied to the primed or unprimed substrate and dried, but not cured, a clearcoat material is subsequently applied to the aqueous basecoat film, and the resulting clearcoat film is cured together with the aqueous basecoat film, thermally or both thermally and with actinic radiation (dual cure).
Suitable substrates are all surfaces for coating which are not damaged by curing of the films present thereon using heat, or heat and actinic radiation in combination (dual cure); for example, metals, plastics, wood, ceramic, stone, textile, fiber assemblies, leather, glass, glass fibers, glass wool and rock wool, mineral-bound and resin-bound building materials, such as plasterboard and cement slabs or roof tiles, and composites of these materials. Accordingly, the multicoat paint systems of the invention are suitable for applications outside those of automotive OEM
finishing and automotive refinish, as well. In this context they are particularly suitable for the coating of furniture and for industrial application, including coil coating and container coating. In the context of industrial applications they are suitable. for coating virtually all parts for private or industrial use, such as radiators, domestic appliances, small metal parts such as nuts and bolts, hubcaps, wheel rims, or packaging.
In the case of electrically conductive substrates it is possible- to use primers, which are prepared in a customary and known manner from eleptrodeposition coating materials. Both anodic and cathodic electrodeposition coating materials are suitable for this purpose, but especially cathodics. Normally, especially in the painting of automobiles, a surfacer coat or antistonechip primer coat, which may be regarded as part of the primer, is applied over the electrocoat.
It is also possible to coat, bond or seal parts made of primed or unprimed plastics, for example, ABS, AMMA, ASA, CA, CAB, EP, UF, CF, MF, MPF, PF, PAN, PA, PE, HDPE, LDPE, LLDPE, UHMWPE, PC, PC/PBT, PC/PA, PET, PMMA, PP, PS, SB, PUR, PVC, RF,SAN, PBT, PPE, POM, PUR-RIM, SMC, BMC, PP-EPDM and UP (abbreviations to DIN 7728T1). In the case of unfunctionalized and/or apolar substrate surfaces, these may be subjected prior to coating in a known manner to a pretreatment, such as with a plasma or by flaming, or may be provided with a water-based primer.
The aqueous basecoat materials of the invention may be applied by any standard method, such as spraying, knifecoating, brushing, flowcoating, dipping, impregnating, trickling or rolling, for example. The substrate to be coated may itself be at rest, with the application device or unit being moved. Alternatively, the substrate to be coated, especially a coil, may be moved, with the application unit being at rest relative to the substrate or being moved appropriately.
It is preferred to employ spray application methods, such as compressed air spraying, airless spraying, high-speed rotation, electrostatic spray application (ESTA), for example, alone or in conjunction with hot spray applications such as hot air spraying, for example. Application can be carried out at temperatures of max.. 70 to 80 C, so that suitable application viscosities are attained without the short period- of thermal loading being accompanied by any changing or damage to the aqueous basecoat material or its over-spray, which may be intended for reprocessing. Hot spraying, for instance, may be configured in such a way that the aqueous basecoat material is heated only very briefly in the spray nozzle or only shortly before the spray nozzle.
St is particularly advantageous to apply the aqueous basecoat material of the invention by ESTA in a first pass and pneumatically in a second pass.
Where the aqueous basecoat materials of the invention include constituents which can be activated with actinic radiation, application is conducted preferably in the absence of light. These application methods may of course also be used for the -application. of the clearcoat film as part of the wet-on-wet technique of the invention.
Curing may take place after a certain rest period. This period may have a duration of from 30 seconds to 2 hours, preferably from 1 minute to 1 hour, and in particular from 1 to 45 minutes. The rest period serves, for example, for leveling and =for the devolatilization of the paint films or for the evaporation of volatile constituents such as solvents.
The rest period may be shortened and/or assisted by the application of elevated temperatures up to 90 C and/or by means of a reduced air humidity < 10 g water/kg air, in particular < 5 g/kg. air, provided this does not cause any damage or alterations to the paint films, such as premature complete crosslinking, for instance.
Physical curing takes place even during the rest period and may be accelerated by the application of heat, with the possibility of using the methods employed below in the context of the thermal cure.
The thermal cure has no special features as far as its method is concerned but instead takes place in accordance with the customary and known methods such as heating in a forced air oven or irradiation using IR
lamps. The thermal cure may also be carried out in stages. Advantageously, it takes place at a temperature from 50 to 100 C, with particular preference from 60 to 100 C, and in particular from 80 to 100 C for a time of from 1 minute to 2 hours, with particular preference from 2 minutes to 1 hour, and in particular from 3 to 45 minutes. Where substrates with high thermal load-bearing capacities are used, thermal crosslinking may also -be carried out at temperatures above 100 C. In this case it is generally 'advisable not to exceed temperatures of 180 C, preferably 160 C, and in particular 155 C.
The curing with actinic radiation also has no special features in terms of its method, but instead takes place in a customary and known manner by irradiation with W lamps and/or electron beam sources, preferably under inert gas.
In the case of conjoint curing of the dual-cure aqueous basecoat films of the invention with the clearcoat films, thermal curing and actinic radiation curing may be employed simultaneously or in alternation. Where the two curing methods are used in alternation, it is possible, for example, to commence with thermal curing and to end with actinic radiation curing. In.other cases it may prove advantageous to commence and to end with actinic radiation curing. The skilled worker is able to determine the curing method most advantageous for the case in hand on the basis of his or her general knowledge in the art, with or without the assistance of simple preliminary tests.
In this context it is found to be a further particular advantage of the aqueous basecoat material of the invention that, in the context of the wet-on-wet technique, all customary and known clearcoat materials may- be combined with -the aqueous basecoat film of the invention.
Examples of suitable known one-component (1K), two-component (2K) or multicomponent (3K, 4K) clearcoat materials are known from the patents DE-A-42 04 518, US-A-5,474,811, US-A-5,356,669, US-A-5,605,965, 11, WO 94/10212, WO 94/10213, EP-A-0 594 068, EP-A-0 594 071, EP-A-0 594 142, EP-A-0 604 992, WO 94/22969, EP-A-0 596 460 and WO 92/22615.
One-component (1K) clearcoat materials comprise, as is known, hydroxyl-containing binders and crosslinking agents such as blocked polyisocyanates, tris(alkoxycarbonylamino)triazines and/or amino resins. In a further variant they comprise polymers containing lateral carbamate and/or allophanate groups as binders and amino resins modified with carbamate and/or with allophanate as crosslinking agents (cf.
US-A-5,474,811, US-A-5,356,669, US-A-5,605,965, WO 94/10211, WO 94/10212, WO 94/10213, EP-A-0 594 068, EP-A-0 594 071 or EP-A-0 594 142).
Two-component (2K). or multicomponent (3K, 4K) clearcoat materials comprise as essential constituents, as is known, hydroxyl-containing binders and polyisocyanate crosslinking agents, which are stored separately until they are used.
Examples of suitable powder clearcoat materials are known, for example, from the German patent DE-A-42 22 194 or from the BASF Lacke + Farben AG product information bulletin "Pulverlacke" [powder coating materials], 1990.
The essential constituents of powder clearcoat materials are, as is known, binders containing epoxide groups, and polycarboxylic acids as crosslinking agents.
Examples of suitable powder slurry clearcoat materials are known, for example, from the U.S. patent US-A-4,268,542 and from the German patent applications DE-A-195 18 392.4 and DE-A-196 13 547, or are described in the German patent application DE-A-198 14 471.7, unpublished at the priority date of the present specification. ..
Powder slurry clearcoat materials, as is known, comprise powder clearcoat materials 'dispersed in anaqueous.medium.
UV-curable clearcoat materials are disclosed, for example, in the patents EP-A-0 540 884, EP-A-O 568 967, and US-A-4,675,234.
Within the multicoat system of the invention, the thickness of the individual coats may vary widely. In accordance with the invention, however, it is of advantage for the aqueous basecoat film to have a thickness of from 5 to 25 m, in particular from 7 to 20 m, and for the clearcoat film to have a thickness of from 15 to 120 m, preferably from 30 to 80 m, and in particular from 40 to 70 m.
The single-coat and multicoat systems of the invention have' outstanding optical, mechanical, and chemical properties. For instance, they are free from any surface defects such as shrinkage (wrinkling).
Moreover., they possess particularly high hiding power and outstanding optical effects, especially cloud-free metallic effects.
Examples 1 (inventive) and Cl and C2 (comparative).
The preparation and use of an inventive aqueous basecoat material (Example 1) and of two noninventive aqueous basecoat materials (Examples Cl and C2) For Examples 1 and Cl and C2 the following ingredients were provided/prepared:
1. Polyurethane dispersion (A):
The polyurethane dispersion (A) was prepared in accordance with the instructions specified in German patent DE-A-44 37 535 on page 7 lines 21, to 34, "B
Preparation of an aqueous polyurethane dispersion". Its solids content was 31% by weight.
2. Secondary aqueous acrylic dispersion:
The secondary aqueous acrylic dispersion was prepared as described in German patent DE-A-44 37 535 on page 8 lines 25 to 49, "E Preparation of an aqueous polyacrylate dispersion". Its solids content.was 40% by weight.
3. Aqueous solution of a polyester:
The aqueous solution of a polyester was prepared as in the instructions specified in German patent DE-A-44 37 535 on page 7 lines 6 to 19, "A Preparation of an aqueous polyester resin solution", and adjusted with water to a solids content of 60% by weight.
4. Rheological aid:
3% aqueous suspension of a synthetic phyllosilicate;
Laponite RD from Laporte.
5. Metallic pigment paste:.
6.0 parts by weight of a 65% suspension of aluminum flakes (Aluminium Stapa Hydrolux from Eckart) were homogenized with 6.5 parts by weight of butyl glycol and 2.1 parts by weight of the aqueous solution of the polyester as per Section 3.
6. Melamine resin solution:
Maprenal VMF 3924 (70%) from Clariant.
7. Neutralizing agent:
10% aqueous solution of dimethylethanolamine.
8. Wetting agent:
Commercial wetting agent from Air Products (50% in butyl glycol).
9. Silica paste for.inventive uses 30 parts by weight of the aqueous solution of the polyester as per Section 3, 46 parts by weight of butyl glycol, 12 parts by weight of water and 12 parts by weight of a silica powder with an average particle size of 5.8 m and a particle density of 2.1 g cm3 were mixed with one another and the mixture was homogenized.
10. Solvent/polyester mixture of the silica paste Example 1 For Example 1, 30 parts by weight of the rheological aid of Section 4 were introduced initially into a vessel. The following ingredients were then added, with stirring, in the stated order: 27 parts by weight of the polyurethane dispersion from Section 1, 3.0 parts by weight of the polyester solution from Section 3, 6.0 parts by weight of the secondary aqueous acrylic dispersion from Section 2, 2.1 parts by weight of butyl glycol, 6.0 parts by weight of melamine resin as per Section 6, 0.3 part by weight of neutralizing agent as per Section 7, 1.5 parts by weight of the wetting agent of Section 8, and 6.0 parts by weight of deionized water. The resulting mixture was homogenized and was admixed - in this order - with 3.0 parts by.weight of the silica paste for inventive use, from Section 9, and with 14.6 parts by weight of the metallic pigment paste from Section 5.
The resulting aqueous basecoat material was adjusted to a pH of from 7.8 to 8.2 using the neutralizing agent from Section 7 and to a viscosity of from 70 to 80 mPas under a shear of .1000 s-1 using deionized water.
Example Cl Example 1 was repeated but without the use of the silica paste from Section 9.
E.'xample C2 Example Cl was repeated but adding 2.64 parts by weight of the solvent/polyester mixture of the silica paste from Section 10.
To test the performance properties of the aqueous basecoat materials, test panels measuring 30 x 70 cm were prepared in a conventional' manner. To this end, steel panels (body panels) which had been coated with a conventional cathodic electrodeposition coating, and baked, were coated with a commercial surfacer from BASF
Coatings AG), after which the resulting surfacer film was flashed off at 20 C and a relative humidity of 65%
for 5 minutes and baked at 140 C in a forced air oven for 30 minutes.
After the cooling of the test panels to 20 C, the aqueous basecoat materials were applied in two spray passes. The first application was carried out by means of ESTA (bell speed: 45,000 1/min, directing air for ESTA: 120 1/min (stp), voltage: 65 kV; distance:
0.25 m; paint outflow volume: 170 ml/min), corresponding to a dry film thickness of 8 to 10 m.
The second application was made pneumatically (distance: 0.32 m, paint outflow volume: 540 ml/rnin, atomizer air volume: 300 1/min (stp), atomizer air pressure: 4.8 bar, horn air volume: 395 1/min (stp), horn air pressure: 5.2 bar), corresponding to a dry film thickness of 4 to 6 m. The aqueous basecoat film was flashed off for 2 minutes in each case after the first and second applications. The aqueous basecoat film was then predried at 80 C for 10 minutes, cooled and overcoated with a commercial two-component clearcoat material (from BASF Coatings AG). Thereafter, aqueous basecoat film and clearcoat film were baked at 130 C for 30 minutes to give the inventive multicoat effect paint system of Example l and the noninventive multicoat paint systems of Examples Cl and C2, with a clearcoat dry film thickness of 40 m.
The test panels were assessed visually for light./dark shading (clouds) under diffuse light from a distance of .2 to 3 m in straight-on view (80 ) and in oblique view (40 ), and the results scored (1: no visible clouds, to 5: clouds very clearly visible).
For Example 1, the straight-on view score was 2 and the oblique view score 3. For Examples Cl and C2, the score was 4 in each case for straight-on viewing and 5 in each case for oblique viewing. This underlines the fact that the use of the silicon dioxide-in accordance with the invention achieves a significant improvement in light/dark shading.
The particles of the powder (C) for use in accordance with the invention have a density of from 0.8 to 3.6, preferably from 0.9 to 3.4, more preferably from 1.0 to 3.2, and in particular from 1.1 to 3.0 g cm3.
In certain cases it would also be possible to use particles having a lower density; in that case, however, the risk exists of the particles floating in the coating materials on prolonged storage.
Alternatively, it would also be possible in certain cases to use particles having a higher density;.in that case, however, the risk exists of the particles settling fairly rapidly on prolonged storage.
The particles of the powders (C) for use in accordance with the invention may be of any desired shape. In accordance with the invention it is of advantage if they have a spherical shape. In. the context of the present invention, a spherical shape is a shape sub-stantially like that of a ball. Examples of spherical shapes are beads, egg-shaped particles, dodecahedra or icosahedra, which may also have certain irregularities.
Examples of suitable substances of which the particles or powders (C) may consist are crosslinked or uncross-linked, organic or organometallic polymers, inorganic minerals, salts or ceramic materials, or organically modified ceramic materials, or mixtures of these substances. Of these, the inorganic minerals are of advantage and are therefore used with preference. These minerals may be natural minerals or synthetic minerals.
Examples of the highly suitable minerals are silicon dioxide, aluminum silicates, calcium silicates, magnesium silicates, calcium aluminum silicates, magnesium aluminum silicates, calcium magnesium silicates, calcium magnesium aluminum silicates, beryllium aluminum silicates, aluminum phosphate or calcium phosphate, or mixtures thereof. Of these, silicon dioxide is particularly advantageous and is therefore used with particular preference in accordance with the invention.
The preparation of the powders (C) for use in accor-dance with the invention has no special features in terms of its method but instead takes place with the aid of methods such as are.customary and known in the field of organic, organometallic .or inorganic chernistry. For example, organic . polymers may be produced by emulsion, dispersion or precipitation polymerization or by size reduction, for example by grinding or spraying, of melts or solutions of ready-produced polymers. The inorganic particles may be.
produced, for example, by precipitation processes and/or size reduction. In the case of ceramic = 11 -materials, it is normal first to produce a green. body, which may already have the desired powder form, and then to fire it.
Where appropriate, the surfaces of the particles are subjected to an aftertreatment, for example, to a hydrophilicizing or hydrophobicizing treatment. How-ever, the aftertreatment must not remove the inertness of the particles.
The powders (C) may be incorporated as they are into the coating materials of the invention, provided they are readily dispersed and do not agglomerate. In accor-dance with the invention it is of advantage if the powders (C) are incorporated in the form of powder pastes. Further advantages result if the paste resins or grinding resins used comprise binders which are present in the coating material of the invention.
The amount of the powders (C) in the coating materials of the invention may vary very widely and is guided primarily by the intensity of the light/dark shading that is to be avoided and by the specified shade of the color and effect coating which is produced from the respective coating material of the invention. It is preferred to employ from 0.09 to 5.0%, more preferably from 0.12 to 3.5%, and in particular from 0.3 to 2.5%
by weight, based in each case on the solids content of the coating material of the invention.
The further essential constituent of the coating material of the invention is at least one binder (A).
In accordance with the invention, said binder (A) comprises at least one ionically and/or nonionically stabilized polyurethane (A) which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds.
Advantageously, depending on the nature of the stabilization, the polyurethane (A) for inventive use has an acid number or amine number of from 10 to 250 mg KOH/g (ionic stabilization or nonionic plus ionic stabilization) or of from 0 to 10 mg KOH/g (nonionic stabilization), an OH number of from 30 to 350 mg KOH/g, and a number average molecular weight of from 1500 to 100,000 daltons.
The method of preparing the polyurethane (A) is arbitrary. It is preferably obtainable by preparing, in a first process step, a polyurethane prepolymer which contains at least one free isocyanate group..
The polyurethane prepolymer is of linear, branched or comb, but especially linear, construction. In this context the linear polyurethane prepolymer includes preferably two free isocyanate groups, especially two terminal free isocyanate groups. The branched or comb-constructed polyurethane prepolymers include preferably at least two, in particular more than two, free isocyanate groups, terminal free isocyanate groups being preferred.
In terms of inethod,. the preparation of the polyurethane prepolymers for use in accordarice with the invention has no special features but instead takes place, for example, as described in patent DE-C-197 22 862 , DE-A-196 45 761, DE-A-44 37 535, EP-A-0 522 419 or EP-A-0 522 420, by reaction of at least one polyol, especially a diol, with at least one polyisocyanate, especially a diisocyanate, the isocyanate component being employed in a molar excess so as to give terminal free isocyanate groups.
For the preparation of the polyurethane prepolymers it is preferred to use diisocyanates and also, if desired, in minor amounts, polyisocyanates, for the purpose of introducing branches. In the context of the present invention, minor amounts are amounts which do not cause gelling of the polyurethane prepolymers during their preparation. This may also be prevented by using small amounts of monoisocyanates.
Examples of suitable diisocyanates are isophorone diisocyanate (i.e., 5-isocyanato-l-isocyanatomethyl-1,3,3-trimethylcyclohexane), 5-isocyanato-l-(2-isocya-natoeth-1-yl)-1,3,3-trimethylcyclohexane, 5-isocyanato-1-(3-isocyanatoprop-1-yl)-1,3,3-trimethylcyclohexane, 5-isocyanato-(4-isocyanatobut-1-yl)-1,3,3-trimethyl-cyclohexane, 1-isocyanato-2-(3-isocyanatoprop-l-yl)cyclohexane, 1-isocyanato-2-(3-isocyanatoeth-1-yl)-cyclohexane, 1-isocyanato-2-(4-isocyanatobut-1-yl)-.cyclohexane, 1,2-diisocyanatocyclobutane, 1,3-diiso-cyanatocyclobutane, 1,2-diisocyanatocyclopentane, 1,3-diisocyanatocyclopentane, 1,2-diisocyanatocyclohexane, 1,3-diisocyanatocyclohexane, .1,4-diisocyanatocyclo-hexane, dicyclohexylmethane 2,4'-diisocyanate, tri-methylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diiso-cyanate, ethylethylene diisocyanate, trimethyihexane diisocyanate, heptamethylene diisocyanate or diiso-cyanates derived from dimeric fatty acids, as marketed under the commercial designation DDI 1410 by the company Henkel and described in the patents WO 97/49745 and WO 97/49747, especially 2-heptyl-3,4-bis(9-isocyanatononyl)-1-pentylcyclohexane, or 1,2-, 1,4- or 1,3-bis(isocyanatomethyl)cyclohexane, 1,2-, 1,4- or 1,3-bis(2-isocyanatoeth-1-yl)cyclohexane, 1,3-bis(3~
isocyanatoprop-1-yl)cyclohexane, 1,2-, 1,4- or 1,3-bis-(4-isocyanatobut-1-yl)cyclohexane, liquid bis(4-iso-cyanatocyclohexyl)methane with a trans/trans content of up to 30% by weight, preferably 25% by weight, and in particular 20% by weight, as is described by the patents DE-A-44 14 032, GB-A-1220717, DE-A-16 18 795 or DE-A-17 93 785; tetramethylxylylidene diisocyanate (TMXDI from CYTEC), tolylene diisocyanate, xylylene diisocyanate, bisphenylene dii.socyanate, naphthylene diisocyanate or diphenylmethane diisocyanate.
Examples of suitable polyisocyanates based on the diisocyanates described above are isocyanato-containing polyurethane prepolymers, which have been prepared by reacting polyols with an excess bf at least one of the above-described diisocyanates, and/or polyisocyanates containing isocyanurate, biuret, allophanate, iminooxadiazinedione, urethane, urea and/or uretdione groups. It is preferred to use polyisocyanates containing on average from 2.5 to 5 isocyanate groups per molecule and having viscosities of from 100 to 10 000, preferably from 100 to 5000 mPas. Furthermore, the polyisocyanates may have been subjected to conventional hydrophilic or hydrophobic modification.
Very particular preference is given to mixtures of polyisocyanates which contain uretdione and/or isocyanurate and/or allophanate groups and which are based on the above-described diisocyanates as formed by catalytic oligomerization of diisocyanates using appropriate catalysts.
Examples of suitable monoisocyanates are phenyl isocyanate, cyclohexyl isocyanate ' or stearyl iso-cyanate, or vinyl isocyanate, methacryloyl isocyanate, and/or 1-(1-isocyanato-l-methylethyl)-3-(1-methyl-ethenyl)benzene (TMI(D from CYTEC).
Examples of suitable polyols are saturated or olefinically unsaturated polyesterpolyols which are prepared by reacting -unsulfonated or sulfonated saturated and/or unsaturated polycarboxylib acids or their esterifiable derivatives, alone or together with monocarboxylic acids, and - saturated and/or unsaturated polyols, alone or together with monools.
Examples of suitable polycarboxylic acids are aromatic, aliphatic and cycloaliphatic polycarboxylic acids.
Preference is given to the use of aromatic and/or aliphatic polycarboxylic ac-Lds.
Examples of suitable aromatic polycarboxylic acids are' phthalic acid, isophthalic acid, terephthalic acid, phthalic, isophthalic or terephthalic acid monosulfonate, or halophthalic acids, such as tetrachlorophthalic or tetrabromophthalic acid, among which isophthalic acid is advantageous and is therefore used with preference.
Examples of suitable acyclic aliphatic or unsaturated polycarboxylic acids are oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic ~ 17 -acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid or dodecanedicarboxylic acid, or dimeric fatty acids or maleic acid, fumaric acid or itaconic acid, of which adipic acid, glutaric acid, azelaic acid, sebacic acid, dimeric fatty acids and maleic acid are advantageous and are therefore used with preference.
Examples of suitable cycloaliphatic and cyclic unsaturated polycarboxylic acids are 1,2-cyclobutanedi-carboxylic acid, 1,3-cyclobutanedicarboxylic acid, 1,2-cyclopentanedicarboxylic acid, 1,3-cyclo-pentanedicarboxylic acid, hexahydrophthalic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicar-boxylic acid, 4-methylhexahydrophthalic acid, tricyclo-decanedicarboxylic acid, tetrahydrophthalic acid or 4-methyltetrahydrophthalic acid. These dicarboxylic acids may be used both in their cis and in their trans form and also as a mixture of both forms.
Also suitable are the esterifiable derivatives of the abovementioned polycarboxylic acids, such as their monoesters or polyesters with aliphatic alcohols having 1 to 4 carbon atoms or hydroxy alcohols having 1 to 4 carbon atoms, for example. It is also possible to use the anhydrides of the abovementioned polycarboxylic acids, where they exist. .
Together with the polycarboxylic acids it is also possible if desired to use monocarboxylic acids, such as, for example, benzoic acid, tert-butylbenzoic acid, lauric acid, isononanoic acid, fatty acids of naturally occurring oils, acrylic acid, methacrylic acid, ethacrylic acid or crotonic acid. The preferred monocarboxylic acid used is isononanoic acid.
Examples of suitable polyols are diols and triols, especially diols. Normally, triols are used alongside the diols in minor amounts in order to introduce branches into the polyester polyols.
Suitable diols are ethylene glycol, 1,2- or 1,-3-propanediol, 1,2-, 1,3- or 1,4-butanediol, 1,2-, 1,3-, 1,4- or 1,5-pentanediol, 1,2-, 1,3-, 1,4-, 1,5- or 1,6-hexanediol, neopentyl hydroxypivalate, neopentyl glycol, diethylene glycol, 1,2-, 1,3- or 1,4-cyclo-hexanediol, 1,2-, 1,3- or 1,4-cyclohexanedimethanol, trimethylpentanediol, ethylbutylpropanediol, the positionally isomeric diethyloctanediols- 2-butyl-2-ethyl-1,3-propanediol, 2-butyl-2-methyl-1,3-propane-diol, 2-phenyl-2-methyl-1,3-propanediol, 2-propyl-2-ethyl-1,3-propanediol, 2-di-tert-butyl-1,3-propanediol, 2-butyl-2-propyl-1,3-propanediol, 1-dihydroxymethyl-bicyclo[2.2.1]heptane, 2,2=diethyl-1,3-propanediol, 2,2-dipropyl-1,3-propanediol 2-cyclohexyl-2-methyl-1,3-propanediol, 2,5-dimethyl-2,5-hexanediol, 2,5-diethyl-2,5-hexanediol, 2-ethyl-5-methyl-2,5-hexanediol, 2,4-dimethyl-2,4-pentanediol, 2,3-dimethyl-2,3-butanediol, 1,4-bis(2'-hydroxypropyl)benzene and 1,3-bis(2'-hydroxypropyl)benzene.
These diols may also be used per se for the preparation of the polyurethanes (A) for inventive use.
Of these diols, hexanediol and neopentyl glycol are particularly advantageous and are therefore used with particular preference.
Examples of suitable triols are trimethylolethane, trimethylolpropane or glycerol, especially trimethyloipropane.
The abovementioned triols may also be used per se to prepare the polyurethanes (A) for inventive use (cf.
patent EP-A-0 339 433).
If desired, minor amounts of monools may also be used.
Examples of suitable monools are alcohols or phenols.
such as ethanol, propanol, n-butanol, sec=butanol, tert-butanol, amyl alcohols, hexanols, fatty alcohols, allyl alcohol, or phenol.
The polyesterpolyols may be prepared in the presence of small amounts of a suitable solvent as entrainer.
Examples of entrainers used are aromatic hydrocarbons,, such as especially xylene and (cyclo)aliphatic hydrocarbons, e.g., cyclohexane or methylcyclohexane.
Further examples of suitable polyols are polyesterdiols which are obtained by reacting a lactone with a diol.
They are notable for the presence of terminal hydroxyl groups and repeating polyester fractions of the formula -(-CO-(CHR)m CH2-O-)-. Here, the index m is preferably from 4 to 6 and the substituent R is hydrogen or an alkyl, cycloalkyl, or alkoxy radical. No substituent contains more than 12 carbon atoms. The total number of carbon atoms in the substituent does not exceed 12 per lactone ring. . Examples are hydroxycaproic acid, hydroxybutyric acid, hydroxydecanoic acid, and/or hydroxystearic acid.
Preferred for the preparation of the polyesterdiols is the unsubstituted E-caprolactone, where m is 4 and all substituents R are hydrogen. The reaction with lactone is started by low molecular mass polyols such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, or dimethylolcyclohexane. It is also possible, however, to react other reaction components, such as ethylenediamine, alkyldialkanolamines, or else urea, with caprolactone. Other suitable diols of relatively high.molecular mass are polylactamdiols, which are prepared by reacting, for example, E-caprolactam with low molecular mass diols.
Further examples of suitable polyols include polyetherpolyols, especially those having a number-average molecular weight of from 400 to 5000, in particular from 400 to 3000. Examples of highly suitable polyetherdiols are polyetherdiols of the general formula H- (-0- ( CHRl ) o- ) pOH, where the substituent R1 is hydrogen or a lower, unsubstituted or substituted alkyl radical, the index o is from 2 to 6, preferably from 3 to 4, and the index p is from 2 to 100, preferably from 5 to 50. Especially suitable examples are linear or branched polyetherdiols such as poly(oxyethylene) glycols, poly(oxypropylene) glycols, and poly(oxybutylene) glycols.
The polyetherdiols should, firstly, not introduce excessive amounts of ether groups, since otherwise the polyurethanes (A) for inventive use that are formed start to swell in water. Secondly, they may be used in amounts which ensure the nonionic stabilization of the polyurethanes (A). In that case they act as the functional nonionic groups (a3) described below.
The polyurethane (A) for inventive use comprises alternatively (al) functional groups convertible into cations by neutralizing agents and/or quaternizing agents, and/or cationic groups, or (a2) functional groups convertible into anions by neutralizing agents, and/or anionic groups, and/or (a3) nonionic hydrophilic groups.
Examples of suitable functional groups (al) for inventive use which are convertible into cations by neutralizing agents and/or quaternizing agents are primary, secondary or tertiary amino groups, secondary sulfide groups or tertiary phosphine groups, especially tertiary amino groups or secondary sulfide groups.
Examples of suitable cationic groups (al) for inventive use are primary, secondary, tertiary or quaternary amanonium groups, tertiary. sulfonium groups or quaternary phosphonium groups, preferably quaternary ammonium groups, quaternary phosphorium groups or tertiary sulfonium groups, but especially tertiary sulfonium groups.
Examples of suitable functional groups (a2) for inventive. use which are ~convertible into anions by neutralizing agents are carboxylic acid, sulfonic acid or phosphonic acid groups, especially carboxylic acid groups.
Examples of suitable anionic groups (a2) for inventive use are carboxylate, sulfonate or phosphonate groups, especially carboxylate groups.
Examples of suitable neutralizing agents for the functional groups (al) convertible into cations are organic and inorganic acids such as formic acid, acetic acid, lactic acid, dimethylolpropionic acid, citric acid, sulfuric acid, hydrochloric acid, and phosphoric acid.
Examples of suitable .neutralizing agents for the functional groups (a2) convertible into anions, are ammonia, ammonium salts, such as ammonium carbonate or ammonium bicarbonate for example, and also amines, such as trimethylamine, triethylamine, tributylamine, dimethylaniline, diethylaniline, triphenylamine, dimethylethanolamine, diethylethanolamine, methyldi-ethanolamine, triethanolamine and the like, for example. Neutralization may take place in organic phase or in aqueous phase. A preferred neutralizing agent used is dimethylethanolamine.
The amount of neutralizing agent used overall in the coating composition of the invention is chosen so that from 1 to 100 equivalents, preferably from 50 to 90 equivalents, of the functional groups (al) or (a2) of the polyurethane (A) for inventive use are neutralized.
The introduction of hydrophilic functional (potentially) cationic groups (a1) into the polyurethane prepolymers takes place by way of the incorporation of compounds which contain in the molecule at least one, especially two, isocyanate-reactive groups and at least one group which is capable of forming cations; the amount to be used may be calculated from the target amine number.
Suitable isocyanate-reactive groups are, in particular, hydroxyl groups and also primary and/or secondary amino groups, of which the hydroxyl groups are used with preference.
Examples of suitable compounds are 2,2-dimethylol-ethylamine or -propylamine blocked with a ketone, the resulting ketoxime group being hydrolyzed again before the cationic group (a1) is formed, or N,N-dimethyl-, N,N-diethyl- or..N-methyl-N-ethyl-2,2-dimethylolethyl-or. -propylamine.
The introduction of (potentially) anionic groups (a2) into the polyurethane molecules takes place by way of the incorporation of compounds which contain in the molecule at least one isocyanate-reactive group and at least one group capable of forming anions; the amount to be. used may be calculated from the target acid number.
Examples of suitable compounds of this kind are those containing two isocyanate-reactive groups in the molecule. Suitable isocyanate-reactive groups are those described above. Accordingly it is possible, for example, to use alkanoic acids having two substituents on the a carbon atom. The substituent may be a hydroxyl group, an alkyl group, or, preferably, an alkylol group. These alkanoic acids have at least one, generally from 1 to 3, carboxyl groups in the molecule.
They have 2 to about 25, preferably 3 to 10, carbon atoms. Examples of suitable alkanoic 'acids are dihydroxypropionic acid, dihydroxysuccinic acid, and dihydroxybenzoic acid. A particularly preferred group of alkanoic acids are the a,oc-dimethylolalkanoic acids of the general formula Ra-C (CHZOH) 2COOH, R2 being a hydrogen atom or an alkyl group having up to about 20 carbon atoms. Examples of especially suitable alkanoic acids are 2,2-dimethylolacetic acid, 2,2-dimethylol-propionic acid, 2,2-dimethylolbutyric acid, and 2,2-dimethylolpentanoic acid. The preferred dihydroxy-alkanoic acid is 2,2-dimethylolpropionic acid. Examples of compounds containing amino groups are oc,S-diaminovaleric acid, 3,4-diaminobenzoic acid, 2,4-diaminotoluenesulfonic acid, and 2,4-diaminodiphenyl ether sulfonic acid.
Nonionic stabilizing poly(oxyalkylene) groups (a3) may be introduced as lateral or terminal groups into the polyurethane molecules. For this purpose it is possible to use, for example, alkoxypoly(oxyalkylene) alcohols having the general formula R3O- (-CH2-CHR4-0- )H, where R3 is an alkyl radical having 1 to 6 carbon atoms, R4 is a hydrogen atom or an alkyl radical having 1 to 6 carbon atoms, and the index r is a number between 20 and 75 (cf. patents EP-A-0 354 261 or Ep-A-O 424 705).
Of these functional (potentially) ionic groups (al) and (a2) and functional nonionic groups (a3), the (potentially) anionic groups (a2) are advantageous and are therefore used with particular preference.
The use of polyols, polyamines and amino alcohols brings about an increase in the molecular weight of the polyurethane prepolymers (A).
Suitable polyols for the chain extension are polyols having up to 36 carbon atoms per molecule, such as ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2--butylene glycol, 1,6-hexanediol, trimethylolpropane, castor oil or ..hydrogenated castor oil, ditrimethylolpropane ether, pentaerythritol, 1,2-cyclohexanediol, 1,4-cyclohexanedimethanol, bisphenol A, bisphenol F, neopentyl glycol, neopentyl glycol hydroxypivalate, hydroxyethylated or hydroxypropylated bisphenol A, hydrogenated bisphenol A. or mixtures thereof (cf. patents EP-A-0 339 433, .EP-A-0 436 941, EP-A-0 517 707).
Examples of suitable polyamines have at least two primary and/or secondary amino groups. Polyamines are essentially alkylene polyamines having 1 to 40 carbon atoms, preferably about 2 to 15 carbon atoms. They may carry substituents which have no hydrogen atoms that are reactive with isocyanate groups. Examples are polyamines having a linear or branched aliphatic, cycloaliphatic or aromatic structure and at least two primary amino groups.
Diamines include hydrazine, ethylenediamine, propylenediamine, 1,4-butylenediamine, piperazine, 1,4-cyclohexyldimethylamine, 1,6-hexamethylenediamine, trimethylhexamethylenediamine, methanediamine, iso-phoronediamine, 4,4'-diaminodicyclohexylmethane, and aminoethyleneethanolamine. Preferred diamines are hydrazine, alkyl- or cycloalkyldiamines such as propylenediamine and 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane.
It is also possible to use polyamines containing more than two amino groups in the molecule. In these cases, however, it should be ensured - for example, by using monoamines as well - that no crosslinked polyurethane resins are obtained. Polyamines of this kind which may be used are diethylenetriamine, triethylenetetramine, dipropylenediamine, and dibutylenetriamine. An example of a monoamine is ethylhexylamine (cf. patent EP-A-0 089 497).
Examples of suitable amino alcohols are ethanolamine and diethanolamine.
The polyurethanes (A) for inventive use may contain terminal and/or lateral olefinically unsaturated groups. Groups of this kind may be introduced, for example, with the aid of compounds containing at least one isocyanate-reactive group, especially hydroxyl group, and at least one vinyl group. Examples of puitable compounds of this kind are trimethylolpropane monoallyl ether and trimethylolpropane mono(meth)-acrylate.
The polyurethanes (A) for inventive use may be grafted with ethylenically unsaturated compounds. Examples of suitable polyurethanes (A) for inventive use, in the form of graft copolymers, are known from patents EP-A-0 521 928, EP-A-0 522 420, EP-A-0 522 419 or EP-A-O 730 613.
The method of preparing the polyurethanes (A) for inventive use has no special features but instead takes place in accordance with the customary and known methods such as those described in the prior art cited at the outset.
The proportion of the polyurethanes (A) for inventive use in the coating materials of the invention may vary likewise extremely widely and is guided primarily by the intended use of the coating materials. Where the coating materials of the invention are curable thermally or both thermally and with actinic radiation, the amount is guided in particular by the functionality of the polyurethanes (A) with respect to the crosslinking reaction with the crosslinking agent (D).
In accordance with the invention it is of advantage to use the amounts as described in the prior art cited at the outset. It is preferred to use from 10 to 80%, with particular preference from 15 to 70%, and in particular from 20 to 60% by weight, based in each case on the solids content of the coating material of the invention.
The third essential constituent of the coating material of the invention is at least one color and/or effect pigment, especially.an effect pigment (B).
The pigments (B) may comprise organic or inorganic compounds. On the basis of this large number of appropriate pigments (B), therefore, the coating material, especially the aqueous basecoat and solid-color topcoat material, particularly the aqueous basecoat material, of the invention ensures a universal breadth of application and permits the realization of a large number of color shades and optical effects.
Effect pigments (B) which may be used include metal flake pigments such as commercial aluminum bronzes, aluminum bronzes chromated in accordance with DE-A-36 36 183, and commercial stainless steel bronzes, and also nonmetallic effect pigments, such as pearlescent pigments and interference pigments, for example. For further details, reference is made to Rompp, op. cit., page 176, "effect pigments", and pages 380 and 381 "metal oxide-mica pigments" to "metal pigments".
Examples of suitable inorganic color pigments (B) are titanium dioxide, iron oxides, sicotrans yellow, and carbon black. Examples of suitable organic color pigments are thioindigo pigments, indanthrene blue, Cromophthal red, Irgazine orange and Heliogen green.
For further details, reference is made to Rompp, op.
cit., pages 180 and 181, "iron blue pigments" to "black iron oxide", pages 451 to 453 "pigments" to "pigment volume concentration", page 563 "thioindigo pigments", and page 567 "titanium dioxide pigments".
The pigments (B) may be incorporated as they are into the coating material of the invention, provided they can be easily dispersed and do not agglomerate and/or their form, responsible for the optical effects, is not damaged or destroyed. it is of advantage in accordance with the invention for the pigments (B) to be incorporated in the form of pigment pastes. Further advantages result if the paste resins or grinding resins used are binders which are present in the coating material of the invention.
The pigment (B) content of the coating material of the invention may vary extremely widely and is guided primarily by the opacity of the pigments, the desired shade, and the desired optical effect. In the coating material of the invention, the pigments (B) are present in an amount of preferably from 0.1 to 50, more preferably from 0.5 to 45, with particular preference from 0.5 to 40, with very particular preference from 0.5 to 35, and in particular from 0.5 to 30% by weight, based in each case on the solids content of the coating material of the invention.
Besides the above-described constituents (A), (B) and (C), the coating material of the invention may comprise at least one solid, liquid or gaseous, organic and/or inorganic additive (D) of low and/or high molecular mass.
Examples of suitable additives (D) for coating materials of the invention that are curable thermally and those curable both thermally and with actinic radiation are crosslinking agents (D) such as nonblocked polyisocyanates, especially the partly or fully blocked polyisocyanates described above, and particularly those derived from the ones described above, amino resins, resins or compounds containing anhydride groups, resins or compounds containing epoxide groups, tris(alkoxycarbonylamino)triazines, resins or compounds containing carbonate groups, beta-hydroxyalkylamides, and compounds containing on average at least two groups capable of transesterification, examples being reaction products of malonic diesters and polyisocyanates or of esters and partial esters of polyhydric alcohols of malonic acid with monoiso-cyanates, as described in European patent EP-A-O 596 460. Crosslinking agents of this kind are well known to the skilled worker and are offered as commercial products by numerous companies.
Depending on the reactivity of the crosslinking agent (D), it may be added directly to the coating materials of the invention, producing what is known as a one-component system. If, however, it is a particularly reactive crosslinking agent (D), such as a polyisocyanate or an epoxide, it is generally not added to the coating materials of the invention until shortly before use. The result in this case is what is known as a two-component or multicomponent system.
Where the coating materials of the invention are to be curable not only thermally but also with actinic radiation (dual cure), they further comprise customary and known additives (D) which can be activated with actinic radiation. With particular preference, UV light is employed. Examples of suitable additives (D) which can be activated with actinic radiation are (meth)acryloyl-, allyl-, vinyl- or dicyclopentadienyl-functional (meth)acrylate copolymers or polyether acrylates, polyester acrylates, unsaturated polyester acrylates, epoxy acrylates, urethane acrylates, amino acrylates, melamine acrylates, silicone acrylates, or the corresponding methacrylates.
The coating material of the invention may further comprise reactive diluents (D) for the thermal, curing or for the curing with actinic radiation.
Examples of suitable reactive diluents (D) for thermal curing are oligomeric polyols (D) obtainable by hydroformylation and subsequent hydrogenation from oligomeric intermediates themselves obtained by metathesis. reactions of acyclic monoolefins and cyclic monoolefins; examples of suitable cyclic monoolefins are cyclobutene, cyclopentene, cyclohexene, cyclo-octene, cycloheptene, norbornene and 7-oxanorbornene;
examples of suitable acyclic rnonoolefins are contained in hydrocarbon mixtures which are obtained in petroleum processing by cracking (C5 cut); examples of suitable oligomeric polyols for use in accordance with the invention have a hydroxyl number of from 200 to 450, a number average molecular weight Mn of from 400 to 1000, and a mass average molecular weight Mw of from 600 to 1100.
Further examples of suitable polyols (D) are branched, cyclic and/or acyclic C9-C16 alkanes functionalized with at least two hydroxyl groups, especially diethyloctanediols.
Further examples of polyols (D) for use are hyperbranched compounds having a tetrafunctional central group, derived from ditrimethylolpropane, diglycerol, ditrimethylolethane, pentaerythritol, tetrakis(2-hydroxyethyl)methane, tetrakis(3-hydroxy-propyl)methane or 2,2-bishydroxymethyl-l,4-butanediol (homopentaerythritol). These reactive diluents may be prepared by the customary and known methods of preparing hyperbranched and dendrimeric compounds.
Suitable synthesis methods are described, for example, in patents WO 93/17060 or WO 96/12754, or in the book by G. R. -Newkome, C. N. Moorefield and F., Vogtle, "Dendritic Molecules, Concepts, Syntheses, PerspectivesN, VCH, Weinheim, New York, 1996.
Suitable radiation-curable reactive diluents (D) include polyfunctional, ethylenically unsaturated compounds of low molecular mass. Examples of suitable such compounds are esters of acrylic acid with polyols, such as neopentyl glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate or pentaerythritol tetraacrylate; or reaction products of hydroxyalkyl acrylates with polyisocyanates, especially aliphatic polyisocyanates.
Additionally to or instead--of the above-described additives (D), the coating material of the invention may comprise customary and known binders (D).
Examples of customary and known binders (D) are oligomeric and polymeric poly(meth)acrylates or acrylate copolymers that are of linear and/or branched and/or block, comb and/or random construction, especially those described in patent DE-A-197 36 535, DE-A-44 37 535 or DE-A-197 41 554; polyesters, especially those described in patent DE-A-40 09 858 or DE-A-44 37 535; alkyds, acrylated polyesters, polylactones, polycarbonates, polyethers, epoxy resin-amine adducts, (meth)acrylatediols, partially hydrolyzed polyvinyl esters, or polyureas,-o.f which the acrylate copolymers and/or the polyesters are particularly advantageous.
The coating material of the invention may otherwise comprise customary coatings additives (D) in effective amounts. The nature and amount of the additives (D) are guided in particular by the intended use of the coating material of the invention.
Examples of suitable additives (D) are:
- organic and inorganic fillers such as chalk, calcium sulfates, barium sulfate, silicates such as talc or kaolin, silicas, oxides such as aluminum hydroxide or magnesium hydroxide, nanoparticles, or organic fillers such as textile fibers, cellulose fibers, polyethylene fibers or wood flour;
- UV absorbers;
- free-radical scavengers;
- crosslinking catalysts;
- slip additives;
- polymerization inhibitors;
- defoamers;
- emulsifiers, especially nonionic emulsifiers such as alkoxylated alkanols, polyols, phenols and alkylphenols or anionic emulsifiers such as alkali metal salts or ammonium salts of alkanecarboxylic acids, alkanesulfonic acids and sulfo acids of alkoxylated alkanols, polyols, phenols and alkylphenols;
- wetting agents such as siloxanes, fluorine compounds, carboxylic monoesters, phosphates, polyacrylic acids and their copolymers., or polyurethanes;
- adhesion promoters;
- leveling agents;
- film-forming auxiliaries such as cellulose derivatives;
- flame retardants;
- rheology control additives, such as those known from the patents WO 94/22968, EP-A-0 276 501 EP-A-0 249 201, WO 97/12945; crosslinked polymeric microparticles, as disclosed for example in EP-A-0 008 127; inorganic phyllosilicates, such as aluminum-magnesium silicates, sodium-magnesium and sodium-magnesium-fluorine-lithium phyllosilicates of the montmorillonite type; silicas such as Aerosils; or synthetic polymers containing ionic and/or associative groups, such as polyvinyl alcohol, poly(meth)acrylamide, poly(meth)acrylic acid, polyvinylpyrrolidone, styrene-maleic anhydride or ethylene-maleic anhydride copolymers and their derivatives or hydrophobically modified ethoxylated urethanes or polyacrylates; or - water-miscible low-boiling and high-boiling organic solvents ("long solvents");
- photoinitiators, such as photoinitiators of the Norrish II type, whose mechanism of action is based on an intramolecular variant of the hydrogen abstraction reactions as occur diversely in the case of photochemical reactions; by way of example, reference may be made here to Rbmpp Chemie Lexikon, 9th, expanded and revised edition, Georg Thieme Verlag, Stuttgart, Vol. 4, 1991.
Further examples of suitable coatings additives (D) are described in the textbook "Lackadditive" [Additives for coatings] by Johan Bieleman, Wiley-VCH, Weinheim, New York, 1998.
Viewed in terms of its method, the preparation of the coating material of the invention has no special features but instead takes place by the dispersing of its constituents in water, in which context it is possible. to employ primary or secondary dispersion methods and also customary and known mixing equipment such as stirred tanks, dissolvers, stirred mills, . or extruders. For example, refer to the prior art cited at the outset.
The coating material of the invention, especially the aqueous basecoat material of the invention, is outstandingly suitable for producing multicoat color and/or effect paint systems on primed and unprimed substrates by the wet-on-wet= technique. Additionally, the coating material, especially solid-color topcoat material, of the invention is outstandingly suitable for producing single-coat color and/or effect paint systems.
The coating material of the invention may also be used, furthermore, as an adhesive =or sealing compound or as a starting product for producing self-supporting paint films.
The coating material of the invention exhibits particular advantages in its use as an aqueous basecoat material as part of the wet-on-wet technique, wherein the aqueous basecoat material is applied to the primed or unprimed substrate and dried, but not cured, a clearcoat material is subsequently applied to the aqueous basecoat film, and the resulting clearcoat film is cured together with the aqueous basecoat film, thermally or both thermally and with actinic radiation (dual cure).
Suitable substrates are all surfaces for coating which are not damaged by curing of the films present thereon using heat, or heat and actinic radiation in combination (dual cure); for example, metals, plastics, wood, ceramic, stone, textile, fiber assemblies, leather, glass, glass fibers, glass wool and rock wool, mineral-bound and resin-bound building materials, such as plasterboard and cement slabs or roof tiles, and composites of these materials. Accordingly, the multicoat paint systems of the invention are suitable for applications outside those of automotive OEM
finishing and automotive refinish, as well. In this context they are particularly suitable for the coating of furniture and for industrial application, including coil coating and container coating. In the context of industrial applications they are suitable. for coating virtually all parts for private or industrial use, such as radiators, domestic appliances, small metal parts such as nuts and bolts, hubcaps, wheel rims, or packaging.
In the case of electrically conductive substrates it is possible- to use primers, which are prepared in a customary and known manner from eleptrodeposition coating materials. Both anodic and cathodic electrodeposition coating materials are suitable for this purpose, but especially cathodics. Normally, especially in the painting of automobiles, a surfacer coat or antistonechip primer coat, which may be regarded as part of the primer, is applied over the electrocoat.
It is also possible to coat, bond or seal parts made of primed or unprimed plastics, for example, ABS, AMMA, ASA, CA, CAB, EP, UF, CF, MF, MPF, PF, PAN, PA, PE, HDPE, LDPE, LLDPE, UHMWPE, PC, PC/PBT, PC/PA, PET, PMMA, PP, PS, SB, PUR, PVC, RF,SAN, PBT, PPE, POM, PUR-RIM, SMC, BMC, PP-EPDM and UP (abbreviations to DIN 7728T1). In the case of unfunctionalized and/or apolar substrate surfaces, these may be subjected prior to coating in a known manner to a pretreatment, such as with a plasma or by flaming, or may be provided with a water-based primer.
The aqueous basecoat materials of the invention may be applied by any standard method, such as spraying, knifecoating, brushing, flowcoating, dipping, impregnating, trickling or rolling, for example. The substrate to be coated may itself be at rest, with the application device or unit being moved. Alternatively, the substrate to be coated, especially a coil, may be moved, with the application unit being at rest relative to the substrate or being moved appropriately.
It is preferred to employ spray application methods, such as compressed air spraying, airless spraying, high-speed rotation, electrostatic spray application (ESTA), for example, alone or in conjunction with hot spray applications such as hot air spraying, for example. Application can be carried out at temperatures of max.. 70 to 80 C, so that suitable application viscosities are attained without the short period- of thermal loading being accompanied by any changing or damage to the aqueous basecoat material or its over-spray, which may be intended for reprocessing. Hot spraying, for instance, may be configured in such a way that the aqueous basecoat material is heated only very briefly in the spray nozzle or only shortly before the spray nozzle.
St is particularly advantageous to apply the aqueous basecoat material of the invention by ESTA in a first pass and pneumatically in a second pass.
Where the aqueous basecoat materials of the invention include constituents which can be activated with actinic radiation, application is conducted preferably in the absence of light. These application methods may of course also be used for the -application. of the clearcoat film as part of the wet-on-wet technique of the invention.
Curing may take place after a certain rest period. This period may have a duration of from 30 seconds to 2 hours, preferably from 1 minute to 1 hour, and in particular from 1 to 45 minutes. The rest period serves, for example, for leveling and =for the devolatilization of the paint films or for the evaporation of volatile constituents such as solvents.
The rest period may be shortened and/or assisted by the application of elevated temperatures up to 90 C and/or by means of a reduced air humidity < 10 g water/kg air, in particular < 5 g/kg. air, provided this does not cause any damage or alterations to the paint films, such as premature complete crosslinking, for instance.
Physical curing takes place even during the rest period and may be accelerated by the application of heat, with the possibility of using the methods employed below in the context of the thermal cure.
The thermal cure has no special features as far as its method is concerned but instead takes place in accordance with the customary and known methods such as heating in a forced air oven or irradiation using IR
lamps. The thermal cure may also be carried out in stages. Advantageously, it takes place at a temperature from 50 to 100 C, with particular preference from 60 to 100 C, and in particular from 80 to 100 C for a time of from 1 minute to 2 hours, with particular preference from 2 minutes to 1 hour, and in particular from 3 to 45 minutes. Where substrates with high thermal load-bearing capacities are used, thermal crosslinking may also -be carried out at temperatures above 100 C. In this case it is generally 'advisable not to exceed temperatures of 180 C, preferably 160 C, and in particular 155 C.
The curing with actinic radiation also has no special features in terms of its method, but instead takes place in a customary and known manner by irradiation with W lamps and/or electron beam sources, preferably under inert gas.
In the case of conjoint curing of the dual-cure aqueous basecoat films of the invention with the clearcoat films, thermal curing and actinic radiation curing may be employed simultaneously or in alternation. Where the two curing methods are used in alternation, it is possible, for example, to commence with thermal curing and to end with actinic radiation curing. In.other cases it may prove advantageous to commence and to end with actinic radiation curing. The skilled worker is able to determine the curing method most advantageous for the case in hand on the basis of his or her general knowledge in the art, with or without the assistance of simple preliminary tests.
In this context it is found to be a further particular advantage of the aqueous basecoat material of the invention that, in the context of the wet-on-wet technique, all customary and known clearcoat materials may- be combined with -the aqueous basecoat film of the invention.
Examples of suitable known one-component (1K), two-component (2K) or multicomponent (3K, 4K) clearcoat materials are known from the patents DE-A-42 04 518, US-A-5,474,811, US-A-5,356,669, US-A-5,605,965, 11, WO 94/10212, WO 94/10213, EP-A-0 594 068, EP-A-0 594 071, EP-A-0 594 142, EP-A-0 604 992, WO 94/22969, EP-A-0 596 460 and WO 92/22615.
One-component (1K) clearcoat materials comprise, as is known, hydroxyl-containing binders and crosslinking agents such as blocked polyisocyanates, tris(alkoxycarbonylamino)triazines and/or amino resins. In a further variant they comprise polymers containing lateral carbamate and/or allophanate groups as binders and amino resins modified with carbamate and/or with allophanate as crosslinking agents (cf.
US-A-5,474,811, US-A-5,356,669, US-A-5,605,965, WO 94/10211, WO 94/10212, WO 94/10213, EP-A-0 594 068, EP-A-0 594 071 or EP-A-0 594 142).
Two-component (2K). or multicomponent (3K, 4K) clearcoat materials comprise as essential constituents, as is known, hydroxyl-containing binders and polyisocyanate crosslinking agents, which are stored separately until they are used.
Examples of suitable powder clearcoat materials are known, for example, from the German patent DE-A-42 22 194 or from the BASF Lacke + Farben AG product information bulletin "Pulverlacke" [powder coating materials], 1990.
The essential constituents of powder clearcoat materials are, as is known, binders containing epoxide groups, and polycarboxylic acids as crosslinking agents.
Examples of suitable powder slurry clearcoat materials are known, for example, from the U.S. patent US-A-4,268,542 and from the German patent applications DE-A-195 18 392.4 and DE-A-196 13 547, or are described in the German patent application DE-A-198 14 471.7, unpublished at the priority date of the present specification. ..
Powder slurry clearcoat materials, as is known, comprise powder clearcoat materials 'dispersed in anaqueous.medium.
UV-curable clearcoat materials are disclosed, for example, in the patents EP-A-0 540 884, EP-A-O 568 967, and US-A-4,675,234.
Within the multicoat system of the invention, the thickness of the individual coats may vary widely. In accordance with the invention, however, it is of advantage for the aqueous basecoat film to have a thickness of from 5 to 25 m, in particular from 7 to 20 m, and for the clearcoat film to have a thickness of from 15 to 120 m, preferably from 30 to 80 m, and in particular from 40 to 70 m.
The single-coat and multicoat systems of the invention have' outstanding optical, mechanical, and chemical properties. For instance, they are free from any surface defects such as shrinkage (wrinkling).
Moreover., they possess particularly high hiding power and outstanding optical effects, especially cloud-free metallic effects.
Examples 1 (inventive) and Cl and C2 (comparative).
The preparation and use of an inventive aqueous basecoat material (Example 1) and of two noninventive aqueous basecoat materials (Examples Cl and C2) For Examples 1 and Cl and C2 the following ingredients were provided/prepared:
1. Polyurethane dispersion (A):
The polyurethane dispersion (A) was prepared in accordance with the instructions specified in German patent DE-A-44 37 535 on page 7 lines 21, to 34, "B
Preparation of an aqueous polyurethane dispersion". Its solids content was 31% by weight.
2. Secondary aqueous acrylic dispersion:
The secondary aqueous acrylic dispersion was prepared as described in German patent DE-A-44 37 535 on page 8 lines 25 to 49, "E Preparation of an aqueous polyacrylate dispersion". Its solids content.was 40% by weight.
3. Aqueous solution of a polyester:
The aqueous solution of a polyester was prepared as in the instructions specified in German patent DE-A-44 37 535 on page 7 lines 6 to 19, "A Preparation of an aqueous polyester resin solution", and adjusted with water to a solids content of 60% by weight.
4. Rheological aid:
3% aqueous suspension of a synthetic phyllosilicate;
Laponite RD from Laporte.
5. Metallic pigment paste:.
6.0 parts by weight of a 65% suspension of aluminum flakes (Aluminium Stapa Hydrolux from Eckart) were homogenized with 6.5 parts by weight of butyl glycol and 2.1 parts by weight of the aqueous solution of the polyester as per Section 3.
6. Melamine resin solution:
Maprenal VMF 3924 (70%) from Clariant.
7. Neutralizing agent:
10% aqueous solution of dimethylethanolamine.
8. Wetting agent:
Commercial wetting agent from Air Products (50% in butyl glycol).
9. Silica paste for.inventive uses 30 parts by weight of the aqueous solution of the polyester as per Section 3, 46 parts by weight of butyl glycol, 12 parts by weight of water and 12 parts by weight of a silica powder with an average particle size of 5.8 m and a particle density of 2.1 g cm3 were mixed with one another and the mixture was homogenized.
10. Solvent/polyester mixture of the silica paste Example 1 For Example 1, 30 parts by weight of the rheological aid of Section 4 were introduced initially into a vessel. The following ingredients were then added, with stirring, in the stated order: 27 parts by weight of the polyurethane dispersion from Section 1, 3.0 parts by weight of the polyester solution from Section 3, 6.0 parts by weight of the secondary aqueous acrylic dispersion from Section 2, 2.1 parts by weight of butyl glycol, 6.0 parts by weight of melamine resin as per Section 6, 0.3 part by weight of neutralizing agent as per Section 7, 1.5 parts by weight of the wetting agent of Section 8, and 6.0 parts by weight of deionized water. The resulting mixture was homogenized and was admixed - in this order - with 3.0 parts by.weight of the silica paste for inventive use, from Section 9, and with 14.6 parts by weight of the metallic pigment paste from Section 5.
The resulting aqueous basecoat material was adjusted to a pH of from 7.8 to 8.2 using the neutralizing agent from Section 7 and to a viscosity of from 70 to 80 mPas under a shear of .1000 s-1 using deionized water.
Example Cl Example 1 was repeated but without the use of the silica paste from Section 9.
E.'xample C2 Example Cl was repeated but adding 2.64 parts by weight of the solvent/polyester mixture of the silica paste from Section 10.
To test the performance properties of the aqueous basecoat materials, test panels measuring 30 x 70 cm were prepared in a conventional' manner. To this end, steel panels (body panels) which had been coated with a conventional cathodic electrodeposition coating, and baked, were coated with a commercial surfacer from BASF
Coatings AG), after which the resulting surfacer film was flashed off at 20 C and a relative humidity of 65%
for 5 minutes and baked at 140 C in a forced air oven for 30 minutes.
After the cooling of the test panels to 20 C, the aqueous basecoat materials were applied in two spray passes. The first application was carried out by means of ESTA (bell speed: 45,000 1/min, directing air for ESTA: 120 1/min (stp), voltage: 65 kV; distance:
0.25 m; paint outflow volume: 170 ml/min), corresponding to a dry film thickness of 8 to 10 m.
The second application was made pneumatically (distance: 0.32 m, paint outflow volume: 540 ml/rnin, atomizer air volume: 300 1/min (stp), atomizer air pressure: 4.8 bar, horn air volume: 395 1/min (stp), horn air pressure: 5.2 bar), corresponding to a dry film thickness of 4 to 6 m. The aqueous basecoat film was flashed off for 2 minutes in each case after the first and second applications. The aqueous basecoat film was then predried at 80 C for 10 minutes, cooled and overcoated with a commercial two-component clearcoat material (from BASF Coatings AG). Thereafter, aqueous basecoat film and clearcoat film were baked at 130 C for 30 minutes to give the inventive multicoat effect paint system of Example l and the noninventive multicoat paint systems of Examples Cl and C2, with a clearcoat dry film thickness of 40 m.
The test panels were assessed visually for light./dark shading (clouds) under diffuse light from a distance of .2 to 3 m in straight-on view (80 ) and in oblique view (40 ), and the results scored (1: no visible clouds, to 5: clouds very clearly visible).
For Example 1, the straight-on view score was 2 and the oblique view score 3. For Examples Cl and C2, the score was 4 in each case for straight-on viewing and 5 in each case for oblique viewing. This underlines the fact that the use of the silicon dioxide-in accordance with the invention achieves a significant improvement in light/dark shading.
Claims (12)
1. An aqueous coating material curable physically, thermally, or both thermally and with actinic radiation, comprising:
A) at least one ionically and/or nonionically stabilized polyurethane which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds, as binder, B) at least one effect pigment or a mixture of a color pigment and an effect pigment, and C) at least one colorless, transparent or opaque powder which is substantially inert with respect to the other constituents of the coating material and whose particles have an average size of from 1.0 to 10.0 µm and a density of from 0.8 to 3.6 g cm-3.
A) at least one ionically and/or nonionically stabilized polyurethane which is saturated, unsaturated and/or grafted with olefinically unsaturated compounds, as binder, B) at least one effect pigment or a mixture of a color pigment and an effect pigment, and C) at least one colorless, transparent or opaque powder which is substantially inert with respect to the other constituents of the coating material and whose particles have an average size of from 1.0 to 10.0 µm and a density of from 0.8 to 3.6 g cm-3.
2. The aqueous coating material of claim 1, wherein the powder C) has an average particle size of from 4.0 to 7.0 µm.
3. The aqueous coating material of claim 1 or 2, wherein the particles have a density of from 0.9 to 3.2 g cm-3.
4. The aqueous coating material of any one of claims 1 to 3, wherein the particles have a spherical shape.
5. The aqueous coating material of any one of claims 1 to 4, wherein the powder C) has a maximum particle size of less than 12 µm.
6. The aqueous coating material of any one of claims 1 to 5, wherein the particles are composed of crosslinked or noncrosslinked, organic or organometallic polymers, inorganic minerals, salts or ceramic materials or organically modified ceramic materials, or of mixtures of these substances.
7. The aqueous coating material of any one of claims 1 to 6, wherein the particles are composed of silicon dioxide, aluminum silicates, calcium silicates, magnesium silicates, calcium aluminum silicates, magnesium aluminum silicates, calcium magnesium silicates, calcium magnesium aluminum silicates, beryllium aluminum silicates, aluminum phosphate, calcium phosphate or a combination thereof.
8. The aqueous coating material of any one of claims 1 to 7, comprising the powder C) in an amount, based on the solids content of the coating material, of from 0.09 to 5.0% by weight.
9. The use of the aqueous coating material as defined any one of claims 1 to 8 for producing single-coat or multicoat color and/or effect paint systems for automotive OEM finishing and automotive refinish, industrial coating, coil coating, container coating, the coating of plastics, and furniture coating.
10. The use as claimed in claim 9, wherein the aqueous coating material is used as aqueous basecoat material and solid-color topcoat material in automotive OEM finishing and automotive refinishing.
11. A process for producing a single-coat or multicoat color and/or effect paint system by applying at least one coat of the aqueous coating material as defined in any one of claims 1 to 8 to a primed or unprimed substrate and subjecting the resultant wet film(s) to thermal curing or curing with heat and actinic light.
12. A process for producing a multicoat color and/or effect paint system by the wet-on-wet technique, by:
(I) applying an aqueous basecoat film to a primed or unprimed substrate, (II) flashing off and predrying the resulting aqueous basecoat film, (III) applying a clearcoat film to the aqueous basecoat film, and (IV) curing the two wet films thermally or with heat and actinic light, which comprises using as aqueous basecoat material the aqueous coating material as defined in any one of claims 1 to 8.
(I) applying an aqueous basecoat film to a primed or unprimed substrate, (II) flashing off and predrying the resulting aqueous basecoat film, (III) applying a clearcoat film to the aqueous basecoat film, and (IV) curing the two wet films thermally or with heat and actinic light, which comprises using as aqueous basecoat material the aqueous coating material as defined in any one of claims 1 to 8.
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DE10004494A DE10004494A1 (en) | 2000-02-02 | 2000-02-02 | Aqueous coating material curable physically, thermally or thermally and with actinic radiation and its use |
PCT/EP2001/000973 WO2001057142A2 (en) | 2000-02-02 | 2001-01-30 | Aqueous coating material that can be hardened physically, thermally or thermally and with actinic radiation and the utilization thereof |
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EP (1) | EP1265967B1 (en) |
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DE10129899A1 (en) * | 2001-06-21 | 2003-01-09 | Basf Coatings Ag | Aqueous coating material curable physically, thermally or thermally and with actinic radiation and its use |
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- 2001-01-30 WO PCT/EP2001/000973 patent/WO2001057142A2/en active IP Right Grant
- 2001-01-30 ES ES01915178T patent/ES2266174T3/en not_active Expired - Lifetime
- 2001-01-30 EP EP01915178A patent/EP1265967B1/en not_active Expired - Lifetime
- 2001-01-30 US US10/181,863 patent/US7297375B2/en not_active Expired - Lifetime
- 2001-01-30 BR BR0107865-8A patent/BR0107865A/en not_active IP Right Cessation
- 2001-01-30 MX MXPA02005855A patent/MXPA02005855A/en active IP Right Grant
- 2001-01-30 AU AU2001242358A patent/AU2001242358A1/en not_active Abandoned
- 2001-01-30 CA CA002398782A patent/CA2398782C/en not_active Expired - Lifetime
- 2001-01-30 AT AT01915178T patent/ATE331765T1/en not_active IP Right Cessation
- 2001-01-30 DE DE50110338T patent/DE50110338D1/en not_active Expired - Lifetime
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2014
- 2014-08-04 JP JP2014158695A patent/JP2014237838A/en not_active Withdrawn
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JP5677715B2 (en) | 2015-02-25 |
EP1265967B1 (en) | 2006-06-28 |
US7297375B2 (en) | 2007-11-20 |
ATE331765T1 (en) | 2006-07-15 |
JP2014237838A (en) | 2014-12-18 |
ES2266174T3 (en) | 2007-03-01 |
JP2003522248A (en) | 2003-07-22 |
US20030139512A1 (en) | 2003-07-24 |
WO2001057142A3 (en) | 2002-03-21 |
CA2398782A1 (en) | 2001-08-09 |
BR0107865A (en) | 2002-11-05 |
WO2001057142A2 (en) | 2001-08-09 |
MXPA02005855A (en) | 2002-10-23 |
AU2001242358A1 (en) | 2001-08-14 |
DE10004494A1 (en) | 2001-08-16 |
EP1265967A2 (en) | 2002-12-18 |
DE50110338D1 (en) | 2006-08-10 |
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