CA2153891C - A method of making an abrasive article - Google Patents
A method of making an abrasive articleInfo
- Publication number
- CA2153891C CA2153891C CA002153891A CA2153891A CA2153891C CA 2153891 C CA2153891 C CA 2153891C CA 002153891 A CA002153891 A CA 002153891A CA 2153891 A CA2153891 A CA 2153891A CA 2153891 C CA2153891 C CA 2153891C
- Authority
- CA
- Canada
- Prior art keywords
- production tool
- backing
- radiation
- mixture
- binder precursor
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 128
- 230000005855 radiation Effects 0.000 claims abstract description 88
- 238000000034 method Methods 0.000 claims abstract description 73
- 239000011230 binding agent Substances 0.000 claims abstract description 66
- 239000000203 mixture Substances 0.000 claims abstract description 65
- 239000002243 precursor Substances 0.000 claims abstract description 58
- 239000002245 particle Substances 0.000 claims abstract description 34
- 229920005989 resin Polymers 0.000 claims description 33
- 239000011347 resin Substances 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 23
- 229920000647 polyepoxide Polymers 0.000 claims description 21
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 20
- 239000003822 epoxy resin Substances 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 13
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical class C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000004593 Epoxy Substances 0.000 claims description 9
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical class OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 claims description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- 238000010894 electron beam technology Methods 0.000 claims description 8
- 125000003700 epoxy group Chemical group 0.000 claims description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 8
- 229920001187 thermosetting polymer Polymers 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- 229920003180 amino resin Chemical class 0.000 claims description 6
- 150000003673 urethanes Chemical class 0.000 claims description 6
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 239000012948 isocyanate Chemical class 0.000 claims description 5
- 150000002513 isocyanates Chemical class 0.000 claims description 5
- 229910052582 BN Inorganic materials 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 4
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 4
- 239000002223 garnet Substances 0.000 claims description 4
- 239000004745 nonwoven fabric Substances 0.000 claims description 4
- 229920005992 thermoplastic resin Polymers 0.000 claims 3
- -1 for example Substances 0.000 description 16
- 238000000576 coating method Methods 0.000 description 10
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- 229920001568 phenolic resin Polymers 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 125000004386 diacrylate group Chemical group 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000012815 thermoplastic material Substances 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- GHMLBKRAJCXXBS-UHFFFAOYSA-N Resorcinol Natural products OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 239000012952 cationic photoinitiator Substances 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
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- 150000002148 esters Chemical class 0.000 description 3
- 230000009969 flowable effect Effects 0.000 description 3
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- 229910052759 nickel Inorganic materials 0.000 description 3
- 125000002524 organometallic group Chemical group 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- BPXVHIRIPLPOPT-UHFFFAOYSA-N 1,3,5-tris(2-hydroxyethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound OCCN1C(=O)N(CCO)C(=O)N(CCO)C1=O BPXVHIRIPLPOPT-UHFFFAOYSA-N 0.000 description 2
- INQDDHNZXOAFFD-UHFFFAOYSA-N 2-[2-(2-prop-2-enoyloxyethoxy)ethoxy]ethyl prop-2-enoate Chemical compound C=CC(=O)OCCOCCOCCOC(=O)C=C INQDDHNZXOAFFD-UHFFFAOYSA-N 0.000 description 2
- UHFFVFAKEGKNAQ-UHFFFAOYSA-N 2-benzyl-2-(dimethylamino)-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=CC=C1 UHFFVFAKEGKNAQ-UHFFFAOYSA-N 0.000 description 2
- KUDUQBURMYMBIJ-UHFFFAOYSA-N 2-prop-2-enoyloxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC(=O)C=C KUDUQBURMYMBIJ-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- OWYWGLHRNBIFJP-UHFFFAOYSA-N Ipazine Chemical compound CCN(CC)C1=NC(Cl)=NC(NC(C)C)=N1 OWYWGLHRNBIFJP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 239000007822 coupling agent Substances 0.000 description 2
- 229910001610 cryolite Inorganic materials 0.000 description 2
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052752 metalloid Inorganic materials 0.000 description 2
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- 229920001155 polypropylene Polymers 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- ODLMAHJVESYWTB-UHFFFAOYSA-N propylbenzene Chemical compound CCCC1=CC=CC=C1 ODLMAHJVESYWTB-UHFFFAOYSA-N 0.000 description 2
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- 229920002803 thermoplastic polyurethane Polymers 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 2
- 229940096522 trimethylolpropane triacrylate Drugs 0.000 description 2
- MYWOJODOMFBVCB-UHFFFAOYSA-N 1,2,6-trimethylphenanthrene Chemical compound CC1=CC=C2C3=CC(C)=CC=C3C=CC2=C1C MYWOJODOMFBVCB-UHFFFAOYSA-N 0.000 description 1
- DMYOHQBLOZMDLP-UHFFFAOYSA-N 1-[2-(2-hydroxy-3-piperidin-1-ylpropoxy)phenyl]-3-phenylpropan-1-one Chemical compound C1CCCCN1CC(O)COC1=CC=CC=C1C(=O)CCC1=CC=CC=C1 DMYOHQBLOZMDLP-UHFFFAOYSA-N 0.000 description 1
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- KWVGIHKZDCUPEU-UHFFFAOYSA-N 2,2-dimethoxy-2-phenylacetophenone Chemical compound C=1C=CC=CC=1C(OC)(OC)C(=O)C1=CC=CC=C1 KWVGIHKZDCUPEU-UHFFFAOYSA-N 0.000 description 1
- PUGOMSLRUSTQGV-UHFFFAOYSA-N 2,3-di(prop-2-enoyloxy)propyl prop-2-enoate Chemical compound C=CC(=O)OCC(OC(=O)C=C)COC(=O)C=C PUGOMSLRUSTQGV-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 description 1
- APZPSKFMSWZPKL-UHFFFAOYSA-N [3-hydroxy-2,2-bis(hydroxymethyl)propyl] 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(CO)(CO)CO APZPSKFMSWZPKL-UHFFFAOYSA-N 0.000 description 1
- AHGFXGSMYLFWEC-UHFFFAOYSA-N [SiH4].CC(=C)C(O)=O Chemical compound [SiH4].CC(=C)C(O)=O AHGFXGSMYLFWEC-UHFFFAOYSA-N 0.000 description 1
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- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
- WVIICGIFSIBFOG-UHFFFAOYSA-N pyrylium Chemical class C1=CC=[O+]C=C1 WVIICGIFSIBFOG-UHFFFAOYSA-N 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000003017 thermal stabilizer Substances 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
- B24D11/001—Manufacture of flexible abrasive materials
- B24D11/005—Making abrasive webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/14—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length
- B29C39/148—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
Abstract
This invention provides a method of making an abrasive article. The method of this invention comprises the steps of: a) providing a backing having a front surface; b) providing a radiation energy transmissive production tool having a contacting surface; c) applying a mixture comprising a plurality of abrasive particles and a binder precursor onto the contacting surface of the production tool; d) causing the mixture on the contacting surface of the production tool to come into contact with the front surface of the backing such that the mixture wets the front surface of the backing; e) transmitting radiation energy through the production tool to at least partially cure the binder precursor to form a shaped, handleable structure; and f) separating the shaped, handleable structure from the production tool. The shaped, handleable structure can be fully cured to form a coated abrasive article.
Description
WO ~11~52 PCT~S941~032 ~ 21538~1 A M4 n~u OF MARING AN ABRASIVE ARTICLE
8ac~.Gu~d of the Invention l. Field of the Invention This invention relates to a method of making an abrasive article, more particularly, a method involving curing a binder precursor by means of l0 radiation energy.
8ac~.Gu~d of the Invention l. Field of the Invention This invention relates to a method of making an abrasive article, more particularly, a method involving curing a binder precursor by means of l0 radiation energy.
2. Discussion of the Art A coated abrasive article typically comprises a plurality of abrasive particles bonded to a backing 15 by means of one or more binders. Examples of typical binders include the following cured resins: phenolic resins, aminoplast resins, urethane resins, epoxy resins, ethylenically unsaturated resins, acrylated isocyanurate resins, urea-formaldehyde resins, 20 isocyanurate resins, acrylated urethane resins, acrylated epoxy resins, and mixtures thereof, with cured phenolic resins being the most popular binder.
Most coated abrasive articles are made by a continuous process in which a backing is first coated with a 25 binder precursor and abrasive particles. Then, the binder precursor is cured to form a binder. This curing process results in the polymerization and solidification of the binder precursor. In some instances, it is desirable to mold a coated abrasive to 30 impart a pattern on its abrasive surface. The molding process will provide a reproducible coating having precisely shaped abrasive particles. If the binder precursor is a thermally curable resin, the thermal cure cycle may be over lO hours in duration. This 35 length of cure cycle is excessively long, and, in many instances, is impractical for preparing coated abrasive articles having precisely shaped abrasive particles.
It is desired to ,develop a process having a short cycle WO94/1~ 21~ 3 8 91 - 2 - PCr~S94/00~2 time for preparing a coated abrasive article having a surface bearing precisely shaped abrasive composites.
summ~rY of the Invention This invention provides a method of making an abrasive article.
In general, the method of this invention comprises the steps of:
a. providing a mixture comprising abrasive particles and a binder precursor;
b. providing a backing having a front surface;
c. positioning the backing with respect to a radiation energy transmissive production tool having a contacting surface, such that the front surface of the backing faces the contacting surface of the production tool to define a mixture receiving space between the contacting surface of the production tool and the front surface of the backing;
d. introducing the mixture of step (a) into the mixture receiving space;
e. transmitting radiation energy through the production tool to at least partially cure the binder precursor to provide a shaped, handleable structure; and f. separating the shaped, handleable structure from the production tool.
For a variety of reasons, one of which is economy, it is often desired to completely fill the mixture receiving space with the mixture.
In one embodiment, the method of this 35 invention comprises the steps of:
a. providing a backing having a front surface;
WO94tl~5t PCT~S94l~03Z
~ 21538~31 b. providing a radiation energy transmissive production tool having a contacting surface;
c. applying a mixture comprising a plurality of abrasive particles and a binder precursor onto the contacting surface of the production tool;
d. causing the mixture on the contacting surface of the production tool to come into direct contact with the front surface of the backing such that the mixture wets the front surface of the backi~g;
e. transmitting radiation energy through the production tool to at least partially cure the binder precursor, whereby the mixture is converted into shaped, handleable structure; and f. separating the ChAr~A, handleable structure from the production tool.
In a second embodiment of the method of this invention, the mixture is applied to the front surface of the backing; the contacting surface of the radiation energy transmissive production tool is brought into 25 direct contact with the mixture such that the mixture wets the contacting surface of the production tool;
radiation energy is then transmitted through the production tool to at least partially cure the binder precursor, whereby the mixture is converted into a 3 0 .ChAp~, handleable structure; and the shaped, handleable structure is separated from the production tool.
The mixture comprises a plurality of abrasive particles and a binder precursor. The binder precursor 3 5 is in a liquid state and has not been polymerized or cured. Because the mixture is in a liquid state, it is able to flow; it can be coated either onto a surface of wo 94rl~s2 2 1 ~ 3 ~ 9 1 PCT~S94l~032 .
the backing or onto a surface of the production tool.
The binder precursor of the mixture can be partially cured by exposure to a source of radiation energy.
Partial curing results in solidification of the binder 5 precursor to form a binder. When the binder is partially cured, the resulting solidified mixture is called a ~hAr~, handleable structure. When the binder in the ch~re~r handleable structure is fully cured, the combination of the backing and the shaped, handleable lo structure is called a coated abrasive article.
Examples of sources of radiation energy include electron beam, ultraviolet light, and visible light. The production tool should be made from a material that does not absorb appreciable amounts of 15 radiation energy. Because the radiation energy is transmitted through the tool and into the mixture, backings that absorb radiation energy can be used because the radiation energy is not required to be transmitted through the backing.
The surface of the production tool that comes into contact with the mixture preferably contains cavities or recesses that are disposed in a pattern.
During the process of this invention, the mixture will wet into and preferably fill out these cavities.
25 Because the binder precursor is at least partially cured on the surface of the production tool, the resulting abrasive article will have a topographical pattern essentially corresponding to the inverse of the pattern on the production tool.
The method of the present invention allows the use of backings that cannot be penetrated by ultraviolet or visible radiation, e.g., backings that are very thick or opaque or both. Moreover, in the case of abrasive composites having a pyramidal shape, 35 the apex of the pyramid can be made to receive a higher dose of radiation, thereby resulting in abrasive WO~4/l~ ~3~91 composites having hard tips, without the need for a post cure step.
Brief DescriDtion of the Drawinqs Figure 1 is a schematic view of an apparatus for preparing an abrasive article according to the method of this invention.
Figure 2 is a schematic view of another apparatus for preparing an abrasive article according 10 to the method of this invention.
Figure 3 is a sectional view of a segment of a production tool useful in the method of this invention.
Detailed DescriPtion This invention provides a method of making an abrasive article comprising a backing having a plurality of abrasive particles adhered thereto by means of a binder.
Figure 1 illustrates an apparatus 10 for making an abrasive article. A production tool 11 is in the form of a belt having two major surfaces and two ends. A backing 12 having a front surface 13 and a back surface 14 leaves an unwind station 15. At the 25 same time, the production tool 11 leaves an unwind station 16. The contacting surface 17 of production tool 11 is coated with a mixture of abrasive particles and binder precursor at coating station 18. The mixture can be heated to lower the viscosity thereof 30 prior to the coating step. The coating station 18 can comprise any conventional coating means, such as knife coater, drop die coater, curtain coater, vacuum die coater, or an extrusion die coater. After the contacting surface 17 of production tool 11 is coated, 35 the backing 12 and the production tool 11 are brought together such that the mixture wets the front surface 1~ of the backing 12. In Figure 1, the mixture is WO94/1~2 2 l~3~9 ~ PCT~S94/00032 .
forced into contact with the backing 12 by means of a contact nip roll 20, which also forces the production tool/mixture/backing construction against a support drum 22. Next, a sufficient dose of radiation energy 5 is transmitted by a source of radiation energy 24 through the back surface 25 of production tool 11 and into the mixture to at least partially cure the binder precursor, thereby forming a ~hAp~, handleable structure 26. The production tool 11 is then separated lO from the ~hAre~, handleable structure 26. Separation of the production tool 11 from the shaped, handleable structure 26 occurs at roller 27. The angle ~ between the ~h~p~, handleable structure 26 and the production tool 11 immediately after passing over roller 27 is 15 preferably steep, e.g., in excess of 30 , in order to bring about clean separation of the shaped, handleable structure 26 from the production tool 11. The production tool 11 is rewound on mandrel 28 so that it can be reused. Shaped, handleable structure 26 is 20 wound on mandrel 30. If the binder precursor has not been fully cured, it can then be fully cured by exposure to an additional energy source, such as a source of thermal energy or an additional source of radiation energy, to form the coated abrasive article.
25 Alternatively, full cure may eventually result without the use of an additional energy source to form the coated abrasive article. As used herein, the phrase "full cure" and the like means that the binder precursor is sufficiently cured so that the resulting 30 product will function as an abrasive article, e.g. a coated abrasive article.
After the abrasive article is formed, it can be flexed and/or humidified prior to converting. The abrasive article can be converted into any desired form 35 such as a cone, endless belt, sheet, disc, etc. before use.
WO94/1~8 ~1S~8 rcT~s94l00032 Figure 2 illustrates an apparatus 40 for an alternative method of preparing an abrasive article.
In this apparatus, the mixture is coated onto the backing rather than onto the production tool. In this 5 apparatus, the production tool 41 is an endless belt - having a front surface and a back surface. A backing 42 having a back surface 43 and a front surface 44 leaves an unwind station 45. The front surface 44 of the backing is coated with a mixture of abrasive lO particles and binder precursor at a coating station 46.
The mixture is forced against the contacting surface 47 of the production tool 41 by means of a contact nip roll 48, which also forces the production tool/mixture/backing construction against a support 15 drum 50, such that the mixture wets the contacting surface 47 of the production tool 41. The production tool 41 is driven over three rotating mandrels 52, 54, and 56. Radiation energy is then transmitted through the back surface 57 of production tool 41 and into the 20 mixture to at least partially cure the binder precursor. There may be one source of radiation energy 58. There may also be a second source of radiation energy 60. These energy sources may be of the same type or of different types. After the binder precursor 25 is at least partially cured, the ~Ar~, hAnAleable structure 62 is separated from the production tool 41 and wound upon a mandrel 64. Separation of the production tool 41 from the shaped, hAn~ 1 eable structure 62 occurs at roller 65. The angle a between 30 the shaped, handleable structure 62 and the production tool 41 immediately after passing over roller 65 is preferably steep, e.g., in excess of 30 , in order to bring about clean separation of the shaped, handleable structure 62 from the production tool 41. If the 35 binder precursor has not been fully cured, it can then be fully cured by exposure to an additional energy source, such as a source of thermal energy or an W094/l~S~ 2 ~3a9 ~ PCT~594/~032 additional source of radiation energy, to form the coated abrasive article. Alternatively, full cure may eventually result without the use of an additional energy source to form the coated abrasive article.
After the abrasive article is formed, it can be flexed and/or humidified prior to converting. The abrasive article can be converted into any desired form such as a cone, endless belt, sheet, disc, etc. before use.
lo In either embodiment, it is often desired to completely fill the space between the contacting surface of the production tool and the front surface of the backing with the mixture of abrasive particles and binder precursor.
Backings suitable for use in the method of this invention have a front surface and a back surface.
Representative examples of materials useful for preparing h~ck;ngs include polymeric film, primed polymeric film, unsized cloth, presized cloth, unsized 20 paper, presized paper, vulcanized fiber, nonwovens and combinations thereof. The backing can be transmissive to or opa~ue to ultraviolet or visible radiation, or transmissive to or opaque to both ultraviolet and visible radiation. The backing may also be subjected 25 to a treatment or treatments to seal the backing or modify some physical properties of the backing, or both. These treatments are well-known in the art. For example, cloth backings may contain a saturant coat, a backsize coat, a presize coat, or any combination 30 thereof. The saturant coat saturates the backing and fills in the small openings in the backing. The backsize coat, which is applied to the backside of the backing, can protect the fibers or yarns during use.
The presize coat is applied to the front side of the 35 backing. The presize coat on the front side of the cloth functions to seal the cloth. Examples of resins useful for treating cloth include phenolics, latexes, WOg4/1~52 21 S38~ PCT~S94l~032 epoxies, acrylates, acrylated epoxies, acrylated urethanes, polyesters, starches, and combinations thereof. The resins for treating cloth may further ~ comprise additives, such as, for example, fillers, 5 fibers, coupling agents, wetting agents, dyes, and ~ pigments.
The mixture to be used to form abrasive composites comprises a plurality of abrasive particles dispersed in a binder precursor. As used herein, the 10 term "mixture" means any composition comprising a plurality of abrasive particles dispersed in a binder precursor. It is preferred that the mixture be flowable. However, if the mixture is not flowable, it can be extruded or forced by other means, e.g. heat or 15 pressure or both, onto the contacting surface of the production tool or onto the front surface of the backing. The mixture can be characterized as being conformable, that is, it can be forced to take on the same shape, outline, or contour as the contacting 20 surface of the production tool and the front surface of the backing.
The abrasive particles typically have a size ranging from about 0.1 to 1500 micrometers, usually from about 1 to 400 micrometers. It is preferred that 25 the abrasive particles have a Mohs' hardness of at least about 8, more preferably above 9. However, the particles can have a Nohs' hardness value lower than 8.
Examples of abrasive particles suitable for use in this invention include fused aluminum oxide, ceramic 30 aluminum oxide, heat treated aluminum oxide, white aluminum oxide, green silicon carbide, silicon carbide, alumina zirconia, diamond, ceria, cubic boron nitride, garnet, and combinations thereof. The phrase "abrasive particles" includes both individual abrasive grits and 35 a plurality of individual abrasive grits bonded together to form an agglomerate. Abrasive agglomerates WO94/1~52 2 1 ~ 3 8 9 1 PCT~S94l00032 are further described in U.S. Patent Nos. 4,311,489;
Most coated abrasive articles are made by a continuous process in which a backing is first coated with a 25 binder precursor and abrasive particles. Then, the binder precursor is cured to form a binder. This curing process results in the polymerization and solidification of the binder precursor. In some instances, it is desirable to mold a coated abrasive to 30 impart a pattern on its abrasive surface. The molding process will provide a reproducible coating having precisely shaped abrasive particles. If the binder precursor is a thermally curable resin, the thermal cure cycle may be over lO hours in duration. This 35 length of cure cycle is excessively long, and, in many instances, is impractical for preparing coated abrasive articles having precisely shaped abrasive particles.
It is desired to ,develop a process having a short cycle WO94/1~ 21~ 3 8 91 - 2 - PCr~S94/00~2 time for preparing a coated abrasive article having a surface bearing precisely shaped abrasive composites.
summ~rY of the Invention This invention provides a method of making an abrasive article.
In general, the method of this invention comprises the steps of:
a. providing a mixture comprising abrasive particles and a binder precursor;
b. providing a backing having a front surface;
c. positioning the backing with respect to a radiation energy transmissive production tool having a contacting surface, such that the front surface of the backing faces the contacting surface of the production tool to define a mixture receiving space between the contacting surface of the production tool and the front surface of the backing;
d. introducing the mixture of step (a) into the mixture receiving space;
e. transmitting radiation energy through the production tool to at least partially cure the binder precursor to provide a shaped, handleable structure; and f. separating the shaped, handleable structure from the production tool.
For a variety of reasons, one of which is economy, it is often desired to completely fill the mixture receiving space with the mixture.
In one embodiment, the method of this 35 invention comprises the steps of:
a. providing a backing having a front surface;
WO94tl~5t PCT~S94l~03Z
~ 21538~31 b. providing a radiation energy transmissive production tool having a contacting surface;
c. applying a mixture comprising a plurality of abrasive particles and a binder precursor onto the contacting surface of the production tool;
d. causing the mixture on the contacting surface of the production tool to come into direct contact with the front surface of the backing such that the mixture wets the front surface of the backi~g;
e. transmitting radiation energy through the production tool to at least partially cure the binder precursor, whereby the mixture is converted into shaped, handleable structure; and f. separating the ChAr~A, handleable structure from the production tool.
In a second embodiment of the method of this invention, the mixture is applied to the front surface of the backing; the contacting surface of the radiation energy transmissive production tool is brought into 25 direct contact with the mixture such that the mixture wets the contacting surface of the production tool;
radiation energy is then transmitted through the production tool to at least partially cure the binder precursor, whereby the mixture is converted into a 3 0 .ChAp~, handleable structure; and the shaped, handleable structure is separated from the production tool.
The mixture comprises a plurality of abrasive particles and a binder precursor. The binder precursor 3 5 is in a liquid state and has not been polymerized or cured. Because the mixture is in a liquid state, it is able to flow; it can be coated either onto a surface of wo 94rl~s2 2 1 ~ 3 ~ 9 1 PCT~S94l~032 .
the backing or onto a surface of the production tool.
The binder precursor of the mixture can be partially cured by exposure to a source of radiation energy.
Partial curing results in solidification of the binder 5 precursor to form a binder. When the binder is partially cured, the resulting solidified mixture is called a ~hAr~, handleable structure. When the binder in the ch~re~r handleable structure is fully cured, the combination of the backing and the shaped, handleable lo structure is called a coated abrasive article.
Examples of sources of radiation energy include electron beam, ultraviolet light, and visible light. The production tool should be made from a material that does not absorb appreciable amounts of 15 radiation energy. Because the radiation energy is transmitted through the tool and into the mixture, backings that absorb radiation energy can be used because the radiation energy is not required to be transmitted through the backing.
The surface of the production tool that comes into contact with the mixture preferably contains cavities or recesses that are disposed in a pattern.
During the process of this invention, the mixture will wet into and preferably fill out these cavities.
25 Because the binder precursor is at least partially cured on the surface of the production tool, the resulting abrasive article will have a topographical pattern essentially corresponding to the inverse of the pattern on the production tool.
The method of the present invention allows the use of backings that cannot be penetrated by ultraviolet or visible radiation, e.g., backings that are very thick or opaque or both. Moreover, in the case of abrasive composites having a pyramidal shape, 35 the apex of the pyramid can be made to receive a higher dose of radiation, thereby resulting in abrasive WO~4/l~ ~3~91 composites having hard tips, without the need for a post cure step.
Brief DescriDtion of the Drawinqs Figure 1 is a schematic view of an apparatus for preparing an abrasive article according to the method of this invention.
Figure 2 is a schematic view of another apparatus for preparing an abrasive article according 10 to the method of this invention.
Figure 3 is a sectional view of a segment of a production tool useful in the method of this invention.
Detailed DescriPtion This invention provides a method of making an abrasive article comprising a backing having a plurality of abrasive particles adhered thereto by means of a binder.
Figure 1 illustrates an apparatus 10 for making an abrasive article. A production tool 11 is in the form of a belt having two major surfaces and two ends. A backing 12 having a front surface 13 and a back surface 14 leaves an unwind station 15. At the 25 same time, the production tool 11 leaves an unwind station 16. The contacting surface 17 of production tool 11 is coated with a mixture of abrasive particles and binder precursor at coating station 18. The mixture can be heated to lower the viscosity thereof 30 prior to the coating step. The coating station 18 can comprise any conventional coating means, such as knife coater, drop die coater, curtain coater, vacuum die coater, or an extrusion die coater. After the contacting surface 17 of production tool 11 is coated, 35 the backing 12 and the production tool 11 are brought together such that the mixture wets the front surface 1~ of the backing 12. In Figure 1, the mixture is WO94/1~2 2 l~3~9 ~ PCT~S94/00032 .
forced into contact with the backing 12 by means of a contact nip roll 20, which also forces the production tool/mixture/backing construction against a support drum 22. Next, a sufficient dose of radiation energy 5 is transmitted by a source of radiation energy 24 through the back surface 25 of production tool 11 and into the mixture to at least partially cure the binder precursor, thereby forming a ~hAp~, handleable structure 26. The production tool 11 is then separated lO from the ~hAre~, handleable structure 26. Separation of the production tool 11 from the shaped, handleable structure 26 occurs at roller 27. The angle ~ between the ~h~p~, handleable structure 26 and the production tool 11 immediately after passing over roller 27 is 15 preferably steep, e.g., in excess of 30 , in order to bring about clean separation of the shaped, handleable structure 26 from the production tool 11. The production tool 11 is rewound on mandrel 28 so that it can be reused. Shaped, handleable structure 26 is 20 wound on mandrel 30. If the binder precursor has not been fully cured, it can then be fully cured by exposure to an additional energy source, such as a source of thermal energy or an additional source of radiation energy, to form the coated abrasive article.
25 Alternatively, full cure may eventually result without the use of an additional energy source to form the coated abrasive article. As used herein, the phrase "full cure" and the like means that the binder precursor is sufficiently cured so that the resulting 30 product will function as an abrasive article, e.g. a coated abrasive article.
After the abrasive article is formed, it can be flexed and/or humidified prior to converting. The abrasive article can be converted into any desired form 35 such as a cone, endless belt, sheet, disc, etc. before use.
WO94/1~8 ~1S~8 rcT~s94l00032 Figure 2 illustrates an apparatus 40 for an alternative method of preparing an abrasive article.
In this apparatus, the mixture is coated onto the backing rather than onto the production tool. In this 5 apparatus, the production tool 41 is an endless belt - having a front surface and a back surface. A backing 42 having a back surface 43 and a front surface 44 leaves an unwind station 45. The front surface 44 of the backing is coated with a mixture of abrasive lO particles and binder precursor at a coating station 46.
The mixture is forced against the contacting surface 47 of the production tool 41 by means of a contact nip roll 48, which also forces the production tool/mixture/backing construction against a support 15 drum 50, such that the mixture wets the contacting surface 47 of the production tool 41. The production tool 41 is driven over three rotating mandrels 52, 54, and 56. Radiation energy is then transmitted through the back surface 57 of production tool 41 and into the 20 mixture to at least partially cure the binder precursor. There may be one source of radiation energy 58. There may also be a second source of radiation energy 60. These energy sources may be of the same type or of different types. After the binder precursor 25 is at least partially cured, the ~Ar~, hAnAleable structure 62 is separated from the production tool 41 and wound upon a mandrel 64. Separation of the production tool 41 from the shaped, hAn~ 1 eable structure 62 occurs at roller 65. The angle a between 30 the shaped, handleable structure 62 and the production tool 41 immediately after passing over roller 65 is preferably steep, e.g., in excess of 30 , in order to bring about clean separation of the shaped, handleable structure 62 from the production tool 41. If the 35 binder precursor has not been fully cured, it can then be fully cured by exposure to an additional energy source, such as a source of thermal energy or an W094/l~S~ 2 ~3a9 ~ PCT~594/~032 additional source of radiation energy, to form the coated abrasive article. Alternatively, full cure may eventually result without the use of an additional energy source to form the coated abrasive article.
After the abrasive article is formed, it can be flexed and/or humidified prior to converting. The abrasive article can be converted into any desired form such as a cone, endless belt, sheet, disc, etc. before use.
lo In either embodiment, it is often desired to completely fill the space between the contacting surface of the production tool and the front surface of the backing with the mixture of abrasive particles and binder precursor.
Backings suitable for use in the method of this invention have a front surface and a back surface.
Representative examples of materials useful for preparing h~ck;ngs include polymeric film, primed polymeric film, unsized cloth, presized cloth, unsized 20 paper, presized paper, vulcanized fiber, nonwovens and combinations thereof. The backing can be transmissive to or opa~ue to ultraviolet or visible radiation, or transmissive to or opaque to both ultraviolet and visible radiation. The backing may also be subjected 25 to a treatment or treatments to seal the backing or modify some physical properties of the backing, or both. These treatments are well-known in the art. For example, cloth backings may contain a saturant coat, a backsize coat, a presize coat, or any combination 30 thereof. The saturant coat saturates the backing and fills in the small openings in the backing. The backsize coat, which is applied to the backside of the backing, can protect the fibers or yarns during use.
The presize coat is applied to the front side of the 35 backing. The presize coat on the front side of the cloth functions to seal the cloth. Examples of resins useful for treating cloth include phenolics, latexes, WOg4/1~52 21 S38~ PCT~S94l~032 epoxies, acrylates, acrylated epoxies, acrylated urethanes, polyesters, starches, and combinations thereof. The resins for treating cloth may further ~ comprise additives, such as, for example, fillers, 5 fibers, coupling agents, wetting agents, dyes, and ~ pigments.
The mixture to be used to form abrasive composites comprises a plurality of abrasive particles dispersed in a binder precursor. As used herein, the 10 term "mixture" means any composition comprising a plurality of abrasive particles dispersed in a binder precursor. It is preferred that the mixture be flowable. However, if the mixture is not flowable, it can be extruded or forced by other means, e.g. heat or 15 pressure or both, onto the contacting surface of the production tool or onto the front surface of the backing. The mixture can be characterized as being conformable, that is, it can be forced to take on the same shape, outline, or contour as the contacting 20 surface of the production tool and the front surface of the backing.
The abrasive particles typically have a size ranging from about 0.1 to 1500 micrometers, usually from about 1 to 400 micrometers. It is preferred that 25 the abrasive particles have a Mohs' hardness of at least about 8, more preferably above 9. However, the particles can have a Nohs' hardness value lower than 8.
Examples of abrasive particles suitable for use in this invention include fused aluminum oxide, ceramic 30 aluminum oxide, heat treated aluminum oxide, white aluminum oxide, green silicon carbide, silicon carbide, alumina zirconia, diamond, ceria, cubic boron nitride, garnet, and combinations thereof. The phrase "abrasive particles" includes both individual abrasive grits and 35 a plurality of individual abrasive grits bonded together to form an agglomerate. Abrasive agglomerates WO94/1~52 2 1 ~ 3 8 9 1 PCT~S94l00032 are further described in U.S. Patent Nos. 4,311,489;
4,652,275; and 4,799,939.
The binder precursor is capable of being cured by energy, preferably radiation energy, more 5 preferably, radiation energy from ultraviolet light, visible light, or electron beam sources. Other sources of energy include infrared, thermal, and microwave. It is preferred that the energy not adversely affect the production tool used in the method of the invention, so 10 that the tool can be reused. The binder precursor can polymerize via a free radical mechanism or a cationic mech~n;~cm. Examples of binder precursors that are capable of being polymerized by exposure to radiation energy include acrylated urethanes, acrylated epoxies, 15 ethylenically unsaturated compounds, aminoplast derivatives having pendant unsaturated carbonyl groups, isocyanurate derivatives having at least one pendant acrylate group, isocyanate derivatives having at least one pendant acrylate group, vinyl ethers, epoxy resins, 20 and combinations thereof. The term "acrylate" includes acrylates and methacrylates.
Acrylated ureth~es are diacrylate esters of hydroxy terminated NCO extended polyesters or polyethers. Examples of commercially available 25 acrylated urethanes include "UVll~ANE 782", available from Morton Thiokol Chemical, and "CMD 6600", "CMD
8400", and "CMD 8805", available from Radcure Specialties.
Acrylated epoxies are diacrylate esters of 30 epoxy resins, such as the diacrylate esters of bisphenol A epoxy resin. Examples of commercially available acrylated epoxies include "CMD 3500", "CMD
3600", and "CMD 3700", available from Radcure Specialties.
Ethylenically unsaturated compounds include both monomeric and polymeric compounds that contain atoms of carbon, hydrogen, and oxygen, and optionally, WO9411~52 21 ~ PCT~S94/~032 nitrogen and the halogens. Oxygen or nitrogen atoms or both are generally present in ether, ester, urethane, amide, and urea ~L UU~ . Ethylenically unsaturated compounds preferably have a molecular weight of less 5 than about 4,000. The preferred ethylenically - unsaturated compounds are esters made from the reaction of compounds containing aliphatic monohydroxy groups or aliphatic polyhydroxy groups and unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, itaconic l0 acid, crotonic acid, isocrotonic acid, maleic acid, and the like. Representative examples of ethylenically unsaturated compounds include methyl methacrylate, ethyl methacrylate, styrene, divinylbenzene, vinyl toluene, ethylene glycol diacrylate, ethylene glycol 15 methacrylate, heY~n~;ol diacrylate, triethylene glycol diacrylate, trimethylolpropane triacrylate, glycerol triacrylate, pentaerythritol triacrylate, pentaerythritol methacrylate, and pentaerythritol tetraacrylate. Other ethylenically unsaturated 20 compounds include monoallyl, polyallyl, and polymethallyl esters and amides of carboxylic acids, such as diallyl phthalate, diallyl adipate, and N,N-diallyladipamide. Still other nitrogen-containing ethylenically unsaturated ~o~.~ounds include tris(2-25 acryloyloxyethyl)isocyanurate, 1,3,5-tri(2-methyacryloxyethyl)-striazine, acrylamide, methylacrylamide, N-methylacrylamide, N,N-dimethylacrylamide, N-vinylpyrrolidone, and N-vinylpiperidone.
Aminoplast resins suitable for this invention have at least one pendant ~,~-unsaturated carbonyl group per molecule or oligomer. These materials are further described in U.S. Patent No. 4,903,440 and U.S.
Serial No. 07/659,752, filed February 24, l99l.
Isocyanurate derivatives having at least one pendant acrylate group and isocyanate derivatives having at least o~e pendant acrylate group are further ==~
wo g4,l~2 2 1 S 3 8 ~1 PCT~S94/00032 .
described in U.S. Patent No. 4,652,275. The preferred isocyanurate derivative is a triacrylate of tris(hydroxy ethyl) isocyanurate.
Epoxy resins have an oxirane ring and are 5 polymerized by opening of the ring. Epoxy resins suitable for this invention include monomeric epoxy resins and oligomeric epoxy resins. Representative examples of epoxy resins preferred for this invention include 2,2-bis[4-(2,3-epoxypropoxy)phenylpropane]
(diglycidyl ether of bisphenol) and commercially available materials under the trade designation "Epon 828", "Epon 1004", and "Epon 1001F", available from Shell Chemical Co., "DER-331", "DER-332", and "DER-334", available from Dow Chemical Co. Other epoxy 15 resins suitable for this invention include glycidyl ethers of phenol formaldehyde novolac (e.g., "DEN-431"
and "DEN-428", available from Dow Chemical Co.). Epoxy resins useful in this invention can polymerize via a cationic me~h~nism in the presence of one or more 20 a~.o~iate photoinitiators. These resins are further described in U.S. Patent No. 4,318,766.
If either ultraviolet radiation or visible radiation is to be used, it is preferred that the binder precursor further comprise a photoinitiator.
25 Examples of photoinitiators that generate a free radical source include, but are not limited to, organic peroxides, azo compounds, quinones, benzophenones, nitroso compounds, acyl halides, hydrazones, mercapto compounds, pyrylium compounds, triacrylimidazoles, 30 bisimidazoles, phosphene oxides, chloroalkyltriazines, benzoin ethers, benzil ketals, thioxanthones, acetophenone derivatives, and combinations thereof.
Cationic photoinitiators generate an acid source to initiate the polymerization of an epoxy 35 resin. Cationic photoinitiators can include a salt having an onium cation and a halogen containing a complex anion of a metal or metalloid. Other cationic WOg4/1~ 21 S3891 PCT~S94/~032 photoinitiators include a salt having an organometallic complex cation and a halogen containing complex anion of a metal or metalloid. These are further described in U.S. Patent No. 4,751,138 (column 6, line 65 to S column 9, line 45). Another example of a cationic - photoinitiator is an organometallic salt and an onium salt described in U.S. Patent No. 4,985,340 (column 4, line 65 to column 14, line 50); European Patent Applications 306,161; 306,162. Still other cationic 10 photoinitiators include an ionic salt of an organometallic complex in which the metal is selected from the elements of Periodic Group IVB, VB, VIB, VIIB
and VIIIB, as described in European Patent Application 109,581.
In addition to the radiation cura~le resins, the binder precursor may further comprise resins that are curable by sources of energy other than radiation energy, such as condensation curable resins. Examples of such con~en~tion curable resins include phenolic 20 resins, melamine-formaldehyde resins, and urea-formaldehyde resins.
The binder precursor can further comprise optional additives, such as, for example, fillers (including grinding aids), fibers, lubricants, wetting 25 agents, surfactants, pigments, dyes, coupling agents, plasticizers, and susp~n~ing agents. An example of an additive to aid in flow properties has the trademark "OX-50", commercially available from DeGussa. The amounts of these materials can be adjusted to provide 30 the properties desired. Examples of fillers include calcium carbonate, silica, quartz, aluminum sulfate, clay, dolomite, calcium metasilicate, and combinations thereof. Examples of grinding aids include potassium tetrafluoroborate, cryolite, sulfur, iron pyrites, 35 graphite, sodium chloride, and combinations thereof.
The mixture can contain up to 70% by weight filler or grinding aid, typically up to 40% by weight, and WO9411~8 ~3~9~ rCT~S94/0003~
preferably from l to lO~ by weight, most preferably from l to 5% by weight.
The mixture can be prepared by mixing the ingredients, preferably by a low shear mixer. A high 5 shear mixer can also be used. Typically, the abrasive particles are gradually added into the binder precursor. Additionally, it is possible to minimize the amount of air bubbles in the mixture. This can be accomplished by pulling a vacuum during the mixing lO step.
During the manufacture of the shaped, handleable structure, radiation energy is transmitted through the production tool and into the mixture to at least partially cure the binder precursor. The phrase 15 "partial cure" means that the binder precursor is polymerized to such a state that the resulting mixture releases from the production tool. The binder precursor can be fully cured once it is removed from the production tool by any energy source, such as, for 20 example, thermal energy or radiation energy. The binder precursor can also be fully cured before the shaped, handleable structure is removed from the production tool.
Sources of radiation energy pre~erred for 25 this invention include electron beam, ultraviolet light, and visible light. Other sources of radiation energy include infrared and microwave. Thermal energy can also be used. Electron beam radiation, which is also known as ionizing radiation, can be used at a 30 dosage of about O.l to about lO Mrad, preferably at a dosage of about l to about l0 Mrad. Ultraviolet radiation refers to non-particulate radiation having a wavelength within the range of about 200 to about 400 nanometers, preferably within the range of about 250 to 35 400 nanometers. It is preferred that ultraviolet radiation be provided by ultraviolet lights at a dosage of l00 to 300 Watts/cm. Visible radiation refers to WO94/157~2 1 ~ 891 PCT~Sg4/00032 non-particulate radiation having a wavelength within the range of about 400 to about 800 nanometers, preferably within the range of about 400 to about 550 ~ nanometers.
In the method of this invention, the - radiation energy is transmitted through the production tool and directly into the mixture. It is preferred that the material from which the production tool is made not absorb an appreciable amount of radiation lO energy or be degraded by radiation energy. For example, if electron beam energy is used, it is preferred that the production tool not be made from a cellulosic material, because the electrons will degrade the cellulose. If ultraviolet radiation or visible 15 radiation is used, the production tool material should transmit sufficient ultraviolet or visible radiation, respectively, to bring about the desired level of cure.
The production tool should be operated at a velocity that is sufficient to avoid degradation by the 20 source of radiation. Production tools that have relatively high resistance to degradation by the source of radiation can be operated at relatively lower velocities; production tools that have relatively low resistance to degradation by the source of radiation 25 can be operated at relatively higher velocities. In short, the a~lo~riate velocity for the production tool d~p~c on the material from which the production tool is made.
The production tool can be in the form of a 30 belt, e.g., an endless belt, a sheet, a continuous sheet or web, a coating roll, a sleeve mounted on a coating roll, or die. The surface of the production tool that will come into contact with the mixture can be smooth or can have a topography or pattern. This 35 surface is referred to herein as the "contacting surface".
WO94/1~52 PCT~S94l00032 2~38~ 16 -If the production tool is in the form of a belt, sheet, web, or sleeve, it will have a contacting surface and a non-contacting surface. If the production tool is in the form of a roll, it will have a contacting surface 5 only. The topography of the abrasive article formed by the method of this invention will have the inverse of the pattern of the contacting surface of the production tool. The pattern of the contacting surface of the production tool will generally be characterized by a 10 plurality of cavities or recesses. The opening of these cavities can have any shape, regular or irregular, such as a rectangle, semicircle, circle, triangle, square, hexagon, octagon, etc. The walls of the cavities can be vertical or tapered. The pattern 15 formed by the cavities can be arranged according to a specified plan or can be random. The cavities can butt up against one another.
Thermoplastic materials that can be used to construct the production tool include polyesters, 20 polycarbonates, poly(ether sulfone), poly(methyl methacrylate), polyure~h~P~, polyvinylchloride, polyolefins, polystyrene, or combinations thereof.
Thermoplastic materials can include additives such as plasticizers, free radical scavengers or stabilizers, 25 thermal stabilizers, antioxidants, and ultraviolet radiation absorbers. These materials are substantially transparent to ultraviolet and visible radiation. One type of production tool is illustrated in Figure 3.
The production tool 70 comprises two layers 71 and 72.
30 The surface of layer 71 is relatively flat and smooth.
The surface of layer 72 has a pattern. Layer 71 exhibits high heat resistance and strength. Examples of materials suitable for layer 71 include polycarbonate and polyester. Layer 72 exhibits low 35 surface energy. The material of low surface energy improves ease of release of the abrasive article from the production tool. Examples of materials suitable WO94/1~2 1~91 PCT~S94l~032 for layer 72 include polypropylene and polyethylene.
In some production tools made of thermoplastic material, the operating conditions for making the - abrasive article should be set such that excessive heat 5 is not generated. If excessive heat is generated, this may distort or melt the thermoplastic tooling. In some instances, ultraviolet light generates heat. It should also be noted that a tool consisting of a single layer is also acceptable, and is the tool of choice in many lO instances.
A thermoplastic production tool can be made according to the following procedure. A master tool is first provided. The master tool is preferably made from metal, e.g., nickel. The master tool can be lS fabricated by any conventional technique, such as engraving, hobbing, knurling, electroforming, diamond turning, laser machi~ing, etc. If a pattern is desired on the surface of the production tool, the master tool should have the inverse of the pattern for the 20 production tool on the surface thereof. The ther~oplastic material can be emhocc~ with the master tool to form the pattern. Embossing can be conducted while the thermoplastic material is in a flowable state. After being embossed, the thermoplastic 25 material can be cooled to bring about solidification.
The production tool can also be made of a cured thermosetting resin. A production tool made of thermosetting material can be made according to the following procedure. An uncured thermosetting resin is 30 applied to a master tool of the type described previously. While the uncured resin is on the surface of the master tool, it can be cured or polymerized by heating such that it will set to have the inverse shape of the pattern of the surface of the master tool.
35 Then, the cured thermosetting resin is removed from the surface of the master tool. The production tool can be made of a cured radiation curable resin, such as, for WO94/1~2 2 1 5 3 ~ 9 ~ PCT~S94/~032 , example acrylated urethane oligomers. Radiation cured production tools are made in the same manner as production tools made of thermosetting resin, with the exception that curing is conducted ~y means of exposure 5 to radiation e.g. ultraviolet radiation.
A particularly useful production tool has been prepared by the following method. A master tool made of nickel and having a flat back surface and a front surface having the inverse of the desired surface 10 toyG~aphy of the production tool was placed on a level surface with the front surface facing up. A dike surrounding the front surface of the master tool was formed by laying appropriate lengths of l/4-inch (0.064 cm) square steel stock around the edges of the master 15 tool. The dike was bonded to the master tool with a bead of "3M Express" vinyl polysiloxane impression material (M;n~c~ta Mining and Manufacturing Company).
An elastomer ("Sylgard #184", Dow Corning Corporation) was catalyzed according to the manufa~LuLe~'s 20 recommendation and then poured onto the front surface of the master tool in sufficient quantity to give a layer having a depth of 1/16-inch (0.16 cm) to 1/8-inch (0.32 cm). The assembly was allowed to stand at room temperature for eight hours to allow air bubbles to 25 dissipate and a gel to form. The assembly was then moved into an oven and held at a temperature of 49C
for 24 hours to fix the dimensions of the elastomer. A
cure of four hours duration at a temperature of 204C
provided an elastomer with maximum mpch~n;cal strength.
30 After cooling, the elastomeric production tool was separated from the master tool and the edges of the production tool trimmed. The finished elastomeric production tool can then be used to produce abrasive articles according to the method of this invention.
The contacting surface of the production tool may also contain a release coating to permit easier release of the abrasive article from the production ; 09411~52 21$3891 PCr~S94l~032 tool. Examples of such release coatings include silicones and fluorochemicals.
The following non-limiting examples will further illustrate the invention. All parts, 5 percentages, ratios, etc, in the examples are by weight unless indicated otherwise.
~Qst ~G~e~ul~ I
The coated abrasive article was converted 10 into 7.6 cm by 335 cm endless belt and tested on a constant load surface grinder. A preweighed 1018 mild steel workpiece having dimensions approximately 2.5 cm by 5 cm by 18 cm was mounted in a holder. The workpiece was positioned vertically, with the 2.5 cm by 15 1~ cm face in contact with a serrated rubber contact wheel (85 Shore A durometer; approximately 36 cm diameter) with one on one lands over which was entrained the coated abrasive belt. The workpiece was then reciprocated vertically through an 18 cm path at 20 the rate of 20 cycles per minute, while a spring loaded plunger urged the workpiece against the belt with a load of 4.5 kg as the belt was driven at about 2050 meters per minute. After one minute elapsed grinding time, the workpiece holder assembly was removed and the 25 work piece re-weighed, the amount of stock removed calculated by subtracting the weight after abrading from the original weight. A new, pre-weighed workpiece and holder were mounted on the equipment. The test endpoint in minutes is recorded in the appropriate 30 tables, i.e., Table 1 and Table 2.
W0 9411~ 2 1 5 3 8 ~ 1 PCT~S~l00032 Test Procedure II
Test Procedure II was essentially the same as Test Procedure I except that the test endpoint was five minutes and the workpiece was 304 stainless steel.
Ex~ple 1 The backing for this example was a J weight rayon backing. The backing had a latex/phenolic resin presize treatment (85 parts latex/15 parts phenolic 10 resin based upon a cured resin) on the front side of the backing. The presize treatment had been applied to the backing and then heated to substantially remove any volatiles and to gel the phenolic resin.
The abrasive article for this example was 15 made on the apparatus illustrated in Figure 1. The production tool was made of polypropylene and was em~ossed off a diamond turned nickel master tool that had a pattern consisting of pyramids placed such that their bases were butted up against one another. The 20 width of the base of the pyramid was about 350 to 400 micrometers and the height of the pyramid was about 350 to 400 micrometers. This type of pattern was illustrated in FIG. 1 of U.S. Patent No. 5,152,917.
The binder precursor consisted of triacrylate 25 of tris(hydroxy ethyl)isocyanurate (50 parts), trimethylol propane triacrylate (50 parts), amorphous silica filler (1 part), commercially available from Degussa under the trade designation "OX-50", methacrylate silane coupling agent (0.5 part), and 2,2-30 dimethoxy-1-2-diphenyl-1-ethanone photoinitiator (0.5 part), commercially available from Ciba Geigy Company under the trade designation "Irgacure 651". White fused aluminum oxide abrasive particles (average size of 40 micrometers) were gradually added into the binder 35 precursor such that the resulting mixture consisted of 2.3 parts abrasive particles to 1 part binder precursor. The source of radiation energy was one WO94/lS752 PCT~S94l00032 21S3~,~
ultraviolet light operating at 118 Watts/cm. The process was a continuous process operating at a web speed of approximately 2.4 meters/minute. After the abrasive article was removed from the apparatus, it was 5 heated for eight hours at 100C to fully cure the latex/phenolic backing treatment. The abrasive article was not flexed prior to testing.
ComP~r~tive Ex~mPle A
10 The article of Comparative Example A was a conventional coated abrasive article. The bac~ing was a polyethylene terephthalate film and the abrasive particles were 40 micrometer white aluminum oxide. The make coat and size coat comprised a resorcinol phenolic 15 resin. The article is available from Minnesota Mining and Manufacturing Company, St. Paul, Minnesota, under the trade designation ~IMp~RTAr Microfinishing Film".
The abrasive articles from Example 1 and Comparative Example A were tested according to Test 20 Procedure I. The results are set forth in Table 1.
Ta~le 1 Example Initial Final Total Ra Time no. cut (g) cut (g) cut (g) (min) 25Comp. A10.6 5.9 15.8 9 2 1 7.1 4.0 78.2 --- 8 Ex~mPl~ 2 The abrasive article for this example was 30 prepared by the same method as was used in Example 1, with the following exceptions.
The photoinitiator was 2-benzyl-2-N,N-dimethylamino-1-(4-morpholinophenyl)-1-butanone, commercially available from Ciba Geigy Corp. under the 35 trade designation "Irgacure 369". The photoinitiator was present at a concentration of 1% by weight of the binder precursor. The abrasive particles were grade WO94/1~52 2 lS 3 8 9 1 PCT~S94/~032 P320 heat treated aluminum oxide. The source of radiation energy was one visible light operating at 236 watts/cm. The speed was approximately 15.2 meters/min.
comParative Ex mpl~ B
The article of Comparative Example B was a conventional coated abrasive. The backing was the same as was used in Example 1 and the abrasive particles were grade P320 heat treated aluminum oxide. The make 10 coat comprised a resorcinol phenolic resin; the size coat comprised a filled resin consisting of 65% resole phenolic resin and 35% cryolite. This product is available from Minnesota Mining and Manufacturing ComrAny, St. Paul, MN, under the trade designation P320 15 "Three-M-ite".
The coated abrasive articles from Example 1, Example 2, and Comparative Example B were tested according to Test Procedure I and Test Procedure II.
The results of Test Procedure I are set forth in Table 20 2 and the results of Test Procedure II are set forth in Table 3.
T~bl~ 2 Example Initial Final Total Time no. cut (g) cut (g) cut (g) (min) 25Comp. B lg.7 3.7 71.8 6.5 2 23.7 8.3 144.1 9 Tabl~ 3 Example Initial Final Total cut (g) Cut (g) cut (g) 301 9.7 2.0 31.2 Comp. B 7.8 2.0 23.5 Example 2 shows the significantly increased 35 cut obtAin~hle with the precisely structured abrasive article when hard abrasive grits are used.
~ WO94rl5752 2 I ~ 3 ~ ~1 PCT~S94/00032 Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the scope and spirit of this A invention, and it should be understood that this 5 invention is not to be unduly limited to the illustrative embodiments set forth herein.
The binder precursor is capable of being cured by energy, preferably radiation energy, more 5 preferably, radiation energy from ultraviolet light, visible light, or electron beam sources. Other sources of energy include infrared, thermal, and microwave. It is preferred that the energy not adversely affect the production tool used in the method of the invention, so 10 that the tool can be reused. The binder precursor can polymerize via a free radical mechanism or a cationic mech~n;~cm. Examples of binder precursors that are capable of being polymerized by exposure to radiation energy include acrylated urethanes, acrylated epoxies, 15 ethylenically unsaturated compounds, aminoplast derivatives having pendant unsaturated carbonyl groups, isocyanurate derivatives having at least one pendant acrylate group, isocyanate derivatives having at least one pendant acrylate group, vinyl ethers, epoxy resins, 20 and combinations thereof. The term "acrylate" includes acrylates and methacrylates.
Acrylated ureth~es are diacrylate esters of hydroxy terminated NCO extended polyesters or polyethers. Examples of commercially available 25 acrylated urethanes include "UVll~ANE 782", available from Morton Thiokol Chemical, and "CMD 6600", "CMD
8400", and "CMD 8805", available from Radcure Specialties.
Acrylated epoxies are diacrylate esters of 30 epoxy resins, such as the diacrylate esters of bisphenol A epoxy resin. Examples of commercially available acrylated epoxies include "CMD 3500", "CMD
3600", and "CMD 3700", available from Radcure Specialties.
Ethylenically unsaturated compounds include both monomeric and polymeric compounds that contain atoms of carbon, hydrogen, and oxygen, and optionally, WO9411~52 21 ~ PCT~S94/~032 nitrogen and the halogens. Oxygen or nitrogen atoms or both are generally present in ether, ester, urethane, amide, and urea ~L UU~ . Ethylenically unsaturated compounds preferably have a molecular weight of less 5 than about 4,000. The preferred ethylenically - unsaturated compounds are esters made from the reaction of compounds containing aliphatic monohydroxy groups or aliphatic polyhydroxy groups and unsaturated carboxylic acids, such as acrylic acid, methacrylic acid, itaconic l0 acid, crotonic acid, isocrotonic acid, maleic acid, and the like. Representative examples of ethylenically unsaturated compounds include methyl methacrylate, ethyl methacrylate, styrene, divinylbenzene, vinyl toluene, ethylene glycol diacrylate, ethylene glycol 15 methacrylate, heY~n~;ol diacrylate, triethylene glycol diacrylate, trimethylolpropane triacrylate, glycerol triacrylate, pentaerythritol triacrylate, pentaerythritol methacrylate, and pentaerythritol tetraacrylate. Other ethylenically unsaturated 20 compounds include monoallyl, polyallyl, and polymethallyl esters and amides of carboxylic acids, such as diallyl phthalate, diallyl adipate, and N,N-diallyladipamide. Still other nitrogen-containing ethylenically unsaturated ~o~.~ounds include tris(2-25 acryloyloxyethyl)isocyanurate, 1,3,5-tri(2-methyacryloxyethyl)-striazine, acrylamide, methylacrylamide, N-methylacrylamide, N,N-dimethylacrylamide, N-vinylpyrrolidone, and N-vinylpiperidone.
Aminoplast resins suitable for this invention have at least one pendant ~,~-unsaturated carbonyl group per molecule or oligomer. These materials are further described in U.S. Patent No. 4,903,440 and U.S.
Serial No. 07/659,752, filed February 24, l99l.
Isocyanurate derivatives having at least one pendant acrylate group and isocyanate derivatives having at least o~e pendant acrylate group are further ==~
wo g4,l~2 2 1 S 3 8 ~1 PCT~S94/00032 .
described in U.S. Patent No. 4,652,275. The preferred isocyanurate derivative is a triacrylate of tris(hydroxy ethyl) isocyanurate.
Epoxy resins have an oxirane ring and are 5 polymerized by opening of the ring. Epoxy resins suitable for this invention include monomeric epoxy resins and oligomeric epoxy resins. Representative examples of epoxy resins preferred for this invention include 2,2-bis[4-(2,3-epoxypropoxy)phenylpropane]
(diglycidyl ether of bisphenol) and commercially available materials under the trade designation "Epon 828", "Epon 1004", and "Epon 1001F", available from Shell Chemical Co., "DER-331", "DER-332", and "DER-334", available from Dow Chemical Co. Other epoxy 15 resins suitable for this invention include glycidyl ethers of phenol formaldehyde novolac (e.g., "DEN-431"
and "DEN-428", available from Dow Chemical Co.). Epoxy resins useful in this invention can polymerize via a cationic me~h~nism in the presence of one or more 20 a~.o~iate photoinitiators. These resins are further described in U.S. Patent No. 4,318,766.
If either ultraviolet radiation or visible radiation is to be used, it is preferred that the binder precursor further comprise a photoinitiator.
25 Examples of photoinitiators that generate a free radical source include, but are not limited to, organic peroxides, azo compounds, quinones, benzophenones, nitroso compounds, acyl halides, hydrazones, mercapto compounds, pyrylium compounds, triacrylimidazoles, 30 bisimidazoles, phosphene oxides, chloroalkyltriazines, benzoin ethers, benzil ketals, thioxanthones, acetophenone derivatives, and combinations thereof.
Cationic photoinitiators generate an acid source to initiate the polymerization of an epoxy 35 resin. Cationic photoinitiators can include a salt having an onium cation and a halogen containing a complex anion of a metal or metalloid. Other cationic WOg4/1~ 21 S3891 PCT~S94/~032 photoinitiators include a salt having an organometallic complex cation and a halogen containing complex anion of a metal or metalloid. These are further described in U.S. Patent No. 4,751,138 (column 6, line 65 to S column 9, line 45). Another example of a cationic - photoinitiator is an organometallic salt and an onium salt described in U.S. Patent No. 4,985,340 (column 4, line 65 to column 14, line 50); European Patent Applications 306,161; 306,162. Still other cationic 10 photoinitiators include an ionic salt of an organometallic complex in which the metal is selected from the elements of Periodic Group IVB, VB, VIB, VIIB
and VIIIB, as described in European Patent Application 109,581.
In addition to the radiation cura~le resins, the binder precursor may further comprise resins that are curable by sources of energy other than radiation energy, such as condensation curable resins. Examples of such con~en~tion curable resins include phenolic 20 resins, melamine-formaldehyde resins, and urea-formaldehyde resins.
The binder precursor can further comprise optional additives, such as, for example, fillers (including grinding aids), fibers, lubricants, wetting 25 agents, surfactants, pigments, dyes, coupling agents, plasticizers, and susp~n~ing agents. An example of an additive to aid in flow properties has the trademark "OX-50", commercially available from DeGussa. The amounts of these materials can be adjusted to provide 30 the properties desired. Examples of fillers include calcium carbonate, silica, quartz, aluminum sulfate, clay, dolomite, calcium metasilicate, and combinations thereof. Examples of grinding aids include potassium tetrafluoroborate, cryolite, sulfur, iron pyrites, 35 graphite, sodium chloride, and combinations thereof.
The mixture can contain up to 70% by weight filler or grinding aid, typically up to 40% by weight, and WO9411~8 ~3~9~ rCT~S94/0003~
preferably from l to lO~ by weight, most preferably from l to 5% by weight.
The mixture can be prepared by mixing the ingredients, preferably by a low shear mixer. A high 5 shear mixer can also be used. Typically, the abrasive particles are gradually added into the binder precursor. Additionally, it is possible to minimize the amount of air bubbles in the mixture. This can be accomplished by pulling a vacuum during the mixing lO step.
During the manufacture of the shaped, handleable structure, radiation energy is transmitted through the production tool and into the mixture to at least partially cure the binder precursor. The phrase 15 "partial cure" means that the binder precursor is polymerized to such a state that the resulting mixture releases from the production tool. The binder precursor can be fully cured once it is removed from the production tool by any energy source, such as, for 20 example, thermal energy or radiation energy. The binder precursor can also be fully cured before the shaped, handleable structure is removed from the production tool.
Sources of radiation energy pre~erred for 25 this invention include electron beam, ultraviolet light, and visible light. Other sources of radiation energy include infrared and microwave. Thermal energy can also be used. Electron beam radiation, which is also known as ionizing radiation, can be used at a 30 dosage of about O.l to about lO Mrad, preferably at a dosage of about l to about l0 Mrad. Ultraviolet radiation refers to non-particulate radiation having a wavelength within the range of about 200 to about 400 nanometers, preferably within the range of about 250 to 35 400 nanometers. It is preferred that ultraviolet radiation be provided by ultraviolet lights at a dosage of l00 to 300 Watts/cm. Visible radiation refers to WO94/157~2 1 ~ 891 PCT~Sg4/00032 non-particulate radiation having a wavelength within the range of about 400 to about 800 nanometers, preferably within the range of about 400 to about 550 ~ nanometers.
In the method of this invention, the - radiation energy is transmitted through the production tool and directly into the mixture. It is preferred that the material from which the production tool is made not absorb an appreciable amount of radiation lO energy or be degraded by radiation energy. For example, if electron beam energy is used, it is preferred that the production tool not be made from a cellulosic material, because the electrons will degrade the cellulose. If ultraviolet radiation or visible 15 radiation is used, the production tool material should transmit sufficient ultraviolet or visible radiation, respectively, to bring about the desired level of cure.
The production tool should be operated at a velocity that is sufficient to avoid degradation by the 20 source of radiation. Production tools that have relatively high resistance to degradation by the source of radiation can be operated at relatively lower velocities; production tools that have relatively low resistance to degradation by the source of radiation 25 can be operated at relatively higher velocities. In short, the a~lo~riate velocity for the production tool d~p~c on the material from which the production tool is made.
The production tool can be in the form of a 30 belt, e.g., an endless belt, a sheet, a continuous sheet or web, a coating roll, a sleeve mounted on a coating roll, or die. The surface of the production tool that will come into contact with the mixture can be smooth or can have a topography or pattern. This 35 surface is referred to herein as the "contacting surface".
WO94/1~52 PCT~S94l00032 2~38~ 16 -If the production tool is in the form of a belt, sheet, web, or sleeve, it will have a contacting surface and a non-contacting surface. If the production tool is in the form of a roll, it will have a contacting surface 5 only. The topography of the abrasive article formed by the method of this invention will have the inverse of the pattern of the contacting surface of the production tool. The pattern of the contacting surface of the production tool will generally be characterized by a 10 plurality of cavities or recesses. The opening of these cavities can have any shape, regular or irregular, such as a rectangle, semicircle, circle, triangle, square, hexagon, octagon, etc. The walls of the cavities can be vertical or tapered. The pattern 15 formed by the cavities can be arranged according to a specified plan or can be random. The cavities can butt up against one another.
Thermoplastic materials that can be used to construct the production tool include polyesters, 20 polycarbonates, poly(ether sulfone), poly(methyl methacrylate), polyure~h~P~, polyvinylchloride, polyolefins, polystyrene, or combinations thereof.
Thermoplastic materials can include additives such as plasticizers, free radical scavengers or stabilizers, 25 thermal stabilizers, antioxidants, and ultraviolet radiation absorbers. These materials are substantially transparent to ultraviolet and visible radiation. One type of production tool is illustrated in Figure 3.
The production tool 70 comprises two layers 71 and 72.
30 The surface of layer 71 is relatively flat and smooth.
The surface of layer 72 has a pattern. Layer 71 exhibits high heat resistance and strength. Examples of materials suitable for layer 71 include polycarbonate and polyester. Layer 72 exhibits low 35 surface energy. The material of low surface energy improves ease of release of the abrasive article from the production tool. Examples of materials suitable WO94/1~2 1~91 PCT~S94l~032 for layer 72 include polypropylene and polyethylene.
In some production tools made of thermoplastic material, the operating conditions for making the - abrasive article should be set such that excessive heat 5 is not generated. If excessive heat is generated, this may distort or melt the thermoplastic tooling. In some instances, ultraviolet light generates heat. It should also be noted that a tool consisting of a single layer is also acceptable, and is the tool of choice in many lO instances.
A thermoplastic production tool can be made according to the following procedure. A master tool is first provided. The master tool is preferably made from metal, e.g., nickel. The master tool can be lS fabricated by any conventional technique, such as engraving, hobbing, knurling, electroforming, diamond turning, laser machi~ing, etc. If a pattern is desired on the surface of the production tool, the master tool should have the inverse of the pattern for the 20 production tool on the surface thereof. The ther~oplastic material can be emhocc~ with the master tool to form the pattern. Embossing can be conducted while the thermoplastic material is in a flowable state. After being embossed, the thermoplastic 25 material can be cooled to bring about solidification.
The production tool can also be made of a cured thermosetting resin. A production tool made of thermosetting material can be made according to the following procedure. An uncured thermosetting resin is 30 applied to a master tool of the type described previously. While the uncured resin is on the surface of the master tool, it can be cured or polymerized by heating such that it will set to have the inverse shape of the pattern of the surface of the master tool.
35 Then, the cured thermosetting resin is removed from the surface of the master tool. The production tool can be made of a cured radiation curable resin, such as, for WO94/1~2 2 1 5 3 ~ 9 ~ PCT~S94/~032 , example acrylated urethane oligomers. Radiation cured production tools are made in the same manner as production tools made of thermosetting resin, with the exception that curing is conducted ~y means of exposure 5 to radiation e.g. ultraviolet radiation.
A particularly useful production tool has been prepared by the following method. A master tool made of nickel and having a flat back surface and a front surface having the inverse of the desired surface 10 toyG~aphy of the production tool was placed on a level surface with the front surface facing up. A dike surrounding the front surface of the master tool was formed by laying appropriate lengths of l/4-inch (0.064 cm) square steel stock around the edges of the master 15 tool. The dike was bonded to the master tool with a bead of "3M Express" vinyl polysiloxane impression material (M;n~c~ta Mining and Manufacturing Company).
An elastomer ("Sylgard #184", Dow Corning Corporation) was catalyzed according to the manufa~LuLe~'s 20 recommendation and then poured onto the front surface of the master tool in sufficient quantity to give a layer having a depth of 1/16-inch (0.16 cm) to 1/8-inch (0.32 cm). The assembly was allowed to stand at room temperature for eight hours to allow air bubbles to 25 dissipate and a gel to form. The assembly was then moved into an oven and held at a temperature of 49C
for 24 hours to fix the dimensions of the elastomer. A
cure of four hours duration at a temperature of 204C
provided an elastomer with maximum mpch~n;cal strength.
30 After cooling, the elastomeric production tool was separated from the master tool and the edges of the production tool trimmed. The finished elastomeric production tool can then be used to produce abrasive articles according to the method of this invention.
The contacting surface of the production tool may also contain a release coating to permit easier release of the abrasive article from the production ; 09411~52 21$3891 PCr~S94l~032 tool. Examples of such release coatings include silicones and fluorochemicals.
The following non-limiting examples will further illustrate the invention. All parts, 5 percentages, ratios, etc, in the examples are by weight unless indicated otherwise.
~Qst ~G~e~ul~ I
The coated abrasive article was converted 10 into 7.6 cm by 335 cm endless belt and tested on a constant load surface grinder. A preweighed 1018 mild steel workpiece having dimensions approximately 2.5 cm by 5 cm by 18 cm was mounted in a holder. The workpiece was positioned vertically, with the 2.5 cm by 15 1~ cm face in contact with a serrated rubber contact wheel (85 Shore A durometer; approximately 36 cm diameter) with one on one lands over which was entrained the coated abrasive belt. The workpiece was then reciprocated vertically through an 18 cm path at 20 the rate of 20 cycles per minute, while a spring loaded plunger urged the workpiece against the belt with a load of 4.5 kg as the belt was driven at about 2050 meters per minute. After one minute elapsed grinding time, the workpiece holder assembly was removed and the 25 work piece re-weighed, the amount of stock removed calculated by subtracting the weight after abrading from the original weight. A new, pre-weighed workpiece and holder were mounted on the equipment. The test endpoint in minutes is recorded in the appropriate 30 tables, i.e., Table 1 and Table 2.
W0 9411~ 2 1 5 3 8 ~ 1 PCT~S~l00032 Test Procedure II
Test Procedure II was essentially the same as Test Procedure I except that the test endpoint was five minutes and the workpiece was 304 stainless steel.
Ex~ple 1 The backing for this example was a J weight rayon backing. The backing had a latex/phenolic resin presize treatment (85 parts latex/15 parts phenolic 10 resin based upon a cured resin) on the front side of the backing. The presize treatment had been applied to the backing and then heated to substantially remove any volatiles and to gel the phenolic resin.
The abrasive article for this example was 15 made on the apparatus illustrated in Figure 1. The production tool was made of polypropylene and was em~ossed off a diamond turned nickel master tool that had a pattern consisting of pyramids placed such that their bases were butted up against one another. The 20 width of the base of the pyramid was about 350 to 400 micrometers and the height of the pyramid was about 350 to 400 micrometers. This type of pattern was illustrated in FIG. 1 of U.S. Patent No. 5,152,917.
The binder precursor consisted of triacrylate 25 of tris(hydroxy ethyl)isocyanurate (50 parts), trimethylol propane triacrylate (50 parts), amorphous silica filler (1 part), commercially available from Degussa under the trade designation "OX-50", methacrylate silane coupling agent (0.5 part), and 2,2-30 dimethoxy-1-2-diphenyl-1-ethanone photoinitiator (0.5 part), commercially available from Ciba Geigy Company under the trade designation "Irgacure 651". White fused aluminum oxide abrasive particles (average size of 40 micrometers) were gradually added into the binder 35 precursor such that the resulting mixture consisted of 2.3 parts abrasive particles to 1 part binder precursor. The source of radiation energy was one WO94/lS752 PCT~S94l00032 21S3~,~
ultraviolet light operating at 118 Watts/cm. The process was a continuous process operating at a web speed of approximately 2.4 meters/minute. After the abrasive article was removed from the apparatus, it was 5 heated for eight hours at 100C to fully cure the latex/phenolic backing treatment. The abrasive article was not flexed prior to testing.
ComP~r~tive Ex~mPle A
10 The article of Comparative Example A was a conventional coated abrasive article. The bac~ing was a polyethylene terephthalate film and the abrasive particles were 40 micrometer white aluminum oxide. The make coat and size coat comprised a resorcinol phenolic 15 resin. The article is available from Minnesota Mining and Manufacturing Company, St. Paul, Minnesota, under the trade designation ~IMp~RTAr Microfinishing Film".
The abrasive articles from Example 1 and Comparative Example A were tested according to Test 20 Procedure I. The results are set forth in Table 1.
Ta~le 1 Example Initial Final Total Ra Time no. cut (g) cut (g) cut (g) (min) 25Comp. A10.6 5.9 15.8 9 2 1 7.1 4.0 78.2 --- 8 Ex~mPl~ 2 The abrasive article for this example was 30 prepared by the same method as was used in Example 1, with the following exceptions.
The photoinitiator was 2-benzyl-2-N,N-dimethylamino-1-(4-morpholinophenyl)-1-butanone, commercially available from Ciba Geigy Corp. under the 35 trade designation "Irgacure 369". The photoinitiator was present at a concentration of 1% by weight of the binder precursor. The abrasive particles were grade WO94/1~52 2 lS 3 8 9 1 PCT~S94/~032 P320 heat treated aluminum oxide. The source of radiation energy was one visible light operating at 236 watts/cm. The speed was approximately 15.2 meters/min.
comParative Ex mpl~ B
The article of Comparative Example B was a conventional coated abrasive. The backing was the same as was used in Example 1 and the abrasive particles were grade P320 heat treated aluminum oxide. The make 10 coat comprised a resorcinol phenolic resin; the size coat comprised a filled resin consisting of 65% resole phenolic resin and 35% cryolite. This product is available from Minnesota Mining and Manufacturing ComrAny, St. Paul, MN, under the trade designation P320 15 "Three-M-ite".
The coated abrasive articles from Example 1, Example 2, and Comparative Example B were tested according to Test Procedure I and Test Procedure II.
The results of Test Procedure I are set forth in Table 20 2 and the results of Test Procedure II are set forth in Table 3.
T~bl~ 2 Example Initial Final Total Time no. cut (g) cut (g) cut (g) (min) 25Comp. B lg.7 3.7 71.8 6.5 2 23.7 8.3 144.1 9 Tabl~ 3 Example Initial Final Total cut (g) Cut (g) cut (g) 301 9.7 2.0 31.2 Comp. B 7.8 2.0 23.5 Example 2 shows the significantly increased 35 cut obtAin~hle with the precisely structured abrasive article when hard abrasive grits are used.
~ WO94rl5752 2 I ~ 3 ~ ~1 PCT~S94/00032 Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the scope and spirit of this A invention, and it should be understood that this 5 invention is not to be unduly limited to the illustrative embodiments set forth herein.
Claims (48)
1. A method for preparing a shaped, handleable structure suitable for making a coated abrasive article comprising the steps of:
a. providing a mixture comprising abrasive particles and a binder precursor;
b. providing a backing having a front surface;
c. positioning said backing with respect to a radiation energy transmissive production tool having a contacting surface so that said front surface of said backing faces said contacting surface of said production tool to define a mixture receiving space between said contacting surface of said production tool and said front surface of said backing;
d. introducing said mixture of step (a) into said mixture receiving space;
e. transmitting radiation energy through said production tool to at least partially cure said binder precursor to provide a shaped, handleable structure; and f. separating said shaped, handleable structure from said production tool.
a. providing a mixture comprising abrasive particles and a binder precursor;
b. providing a backing having a front surface;
c. positioning said backing with respect to a radiation energy transmissive production tool having a contacting surface so that said front surface of said backing faces said contacting surface of said production tool to define a mixture receiving space between said contacting surface of said production tool and said front surface of said backing;
d. introducing said mixture of step (a) into said mixture receiving space;
e. transmitting radiation energy through said production tool to at least partially cure said binder precursor to provide a shaped, handleable structure; and f. separating said shaped, handleable structure from said production tool.
2. The method of claim 1 wherein said contacting surface of said production tool contains cavities.
3. The method of claim 2 wherein said cavities are disposed in a non-random pattern.
4. The method of claim 1 wherein said backing comprises a material selected from the group consisting of polymeric film, primed polymeric film, untreated cloth, treated cloth, untreated paper, treated paper, vulcanized fiber, nonwovens, and combinations thereof.
5. The method of claim 1 wherein said abrasive particles comprise material selected from the group consisting of fused aluminum oxide, ceramic aluminum oxide, heat treated aluminum oxide, green silicon carbide, white aluminum oxide, silicon carbide, alumina zirconia, diamond, ceria, cubic boron nitride, garnet, and combinations thereof.
6. The method of claim 1 wherein said abrasive particles have a Moh hardness of at least about 8.
7. The method of claim 1 wherein said binder precursor is capable of being cured by radiation energy.
8. The method of claim 1 wherein said binder precursor is selected from the group consisting of acrylated urethanes, acrylated epoxies, ethylenically unsaturated compounds, aminoplast derivatives having pendant unsaturated carbonyl groups, isocyanurate derivatives having at least one pendant acrylate group, isocyanate derivatives having at least one pendant acrylate group, vinyl ethers, epoxy resins, and combinations thereof.
9. The method of claim 8 wherein said binder precursor further comprises a photoinitiator.
10. The method of claim 1 wherein said mixture is applied by means of a coater selected from the group consisting of knife coater, drop die coater, curtain coater, vacuum die coater, and extrusion die coater.
11. The method of claim 1 wherein said production tool is transmissive of ultraviolet radiation, visible radiation, or both ultraviolet radiation and visible radiation.
12. The method of claim 1 wherein said production tool comprises a thermoplastic resin, a thermosetting resin, or a radiation-curable resin.
13. The method of claim 1 wherein said production tool comprises an endless belt.
14. The method of claim 1 wherein said source of energy is selected from the group consisting of electron beam, ultraviolet radiation, and visible radiation.
15. The method of claim 1 wherein said backing is opaque to said radiation energy.
16. A method of preparing a coated abrasive article comprising the step of fully curing the shaped, handleable structure of claim 1.
17. A method for preparing a shaped, handleable structure for making a coated abrasive article comprising the steps of:
a. providing a backing having a front surface;
b. providing a radiation energy transmissive production tool having a contacting surface;
c. applying a mixture comprising a plurality of abrasive particles and a binder precursor or onto the contacting surface of said production tool;
d. causing the mixture on the contacting surface of said production tool to come into contact with the front surface of said backing such that said mixture wets the front surface of said backing;
e. transmitting radiation energy through said production tool to at least partially cure said binder precursor to provide a shaped, handleable structure; and f. separating said shaped, handleable structure-from said production tool.
a. providing a backing having a front surface;
b. providing a radiation energy transmissive production tool having a contacting surface;
c. applying a mixture comprising a plurality of abrasive particles and a binder precursor or onto the contacting surface of said production tool;
d. causing the mixture on the contacting surface of said production tool to come into contact with the front surface of said backing such that said mixture wets the front surface of said backing;
e. transmitting radiation energy through said production tool to at least partially cure said binder precursor to provide a shaped, handleable structure; and f. separating said shaped, handleable structure-from said production tool.
18. The method of claim 17 wherein said contacting surface of said production tool contains cavities.
19. The method of claim 18 wherein said cavities are disposed in a non-random pattern.
20. The method of claim 17 wherein said backing comprises a material selected from the group consisting of polymeric film, primed polymeric film, untreated cloth, treated cloth, untreated paper, treated paper, vulcanized fiber, nonwovens and combinations thereof.
21. The method of claim 17 wherein said abrasive particles comprise material selected from the group consisting of fused aluminum oxide, ceramic aluminum oxide, heat treated aluminum oxide, green silicon carbide, white aluminum oxide, silicon carbide, alumina zirconia, diamond, ceria, cubic boron nitride, garnet, and combinations thereof.
22. The method of claim 17 wherein said abrasive particles have a Moh hardness of at least about 8.
23. The method of claim 17 wherein said binder precursor is capable of being cured by radiation energy.
24. The method of claim 17 wherein said binder precursor is selected from the group consisting of acrylated urethanes, acrylated epoxies, ethylenically unsaturated compounds, aminoplast derivatives having pendant unsaturated carbonyl groups, isocyanurate derivatives having at least one pendant acrylate group, isocyanate derivatives having at least one pendant acrylate group, vinyl ethers, epoxy resins, and combinations thereof.
25. The method of claim 24 wherein said binder precursor further comprises a photoinitiator.
26. The method of claim 17 wherein said mixture is applied by means of a coater selected from the group consisting of knife coater, drop die coater, curtain coater, vacuum die coater, and extrusion die coater.
27. The method of claim 17 wherein said production tool is transmissive of to ultraviolet radiation, visible radiation, or both ultraviolet radiation and visible radiation.
28. The method of claim 17 wherein said production tool comprises a thermoplastic resin, a thermosetting resin, or a radiation-curable resin.
29. The method of claim 17 wherein said source of energy is selected from the group consisting of electron beam, ultraviolet radiation, and visible radiation.
30. The method of claim 17 wherein said backing is opaque to said radiation energy.
31. The method of claim 17 wherein said production tool comprises an endless belt.
32. A method of preparing a coated abrasive article comprising the step of fully curing the shaped, handleable structure of claim 17.
33. A method for preparing a shaped, handleable structure for making a coated abrasive article comprising the steps of:
a. providing a backing having a front surface;
b. providing a radiation energy transmissive production tool having a contacting surface;
c. applying a mixture comprising a plurality of abrasive particles and a binder precursor to the front surface of said backing;
d. causing said mixture on the front surface of said backing to come into direct contact with the contacting surface of said production tool such that said mixture wets the contacting surface of said production tool;
e. transmitting radiation energy through said production tool to at least partially cure said binder precursor to provide a shaped handleable structure; and f. separating said shaped, handleable structure from said production tool.
a. providing a backing having a front surface;
b. providing a radiation energy transmissive production tool having a contacting surface;
c. applying a mixture comprising a plurality of abrasive particles and a binder precursor to the front surface of said backing;
d. causing said mixture on the front surface of said backing to come into direct contact with the contacting surface of said production tool such that said mixture wets the contacting surface of said production tool;
e. transmitting radiation energy through said production tool to at least partially cure said binder precursor to provide a shaped handleable structure; and f. separating said shaped, handleable structure from said production tool.
34. The method of claim 33 wherein said contacting surface of said production tool contains cavities.
35. The method of claim 34 wherein said cavities are disposed in a non-random pattern.
36. The method of claim 33 wherein said backing comprises a material selected from the group consisting of polymeric film, primed polymeric film, untreated cloth, treated cloth, untreated paper, treated paper, vulcanized fiber, nonwovens,and combinations thereof.
37. The method of claim 33 wherein said abrasive particles comprise material selected from the group consisting of fused aluminum oxide, ceramic aluminum oxide, heat treated aluminum oxide, green silicon carbide, white aluminum oxide, silicon carbide, alumina zirconia, diamond, ceria, cubic boron nitride, garnet, and combinations thereof.
38. The method of claim 33 wherein said abrasive particles have a Moh hardness of at least about 8.
39. The method of claim 33 wherein said binder precursor is capable of being cured by radiation energy.
40. The method of claim 33 wherein said binder precursor is selected from the group consisting of acrylated urethanes, acrylated epoxies, ethylenically unsaturated compounds, aminoplast derivatives having pendant unsaturated carbonyl groups, isocyanurate derivatives having at least one pendant acrylate group, isocyanate derivatives having at least one pendant acrylate group, vinyl ethers, epoxy resins, and combinations thereof.
41. The method of claim 40 wherein said binder precursor further comprises a photoinitiator.
42. The method of claim 33 wherein said mixture is applied by means of a coater selected from the group consisting of knife coater, drop die coater, curtain coater, vacuum die coater, and extrusion die coater.
43. The method of claim 33 wherein said production tool is transmissive of ultraviolet radiation visible radiation, or both ultraviolet radiation and visible radiation.
44. The method of claim 33 wherein said production tool comprises a thermoplastic resin, a thermosetting resin, or a radiation-curable resin.
45. The method of claim 33 wherein said source of energy is selected from the group consisting of electron beam, ultraviolet radiation, and visible radiation.
46. The method of claim 33 wherein said backing is opaque to said radiation energy.
47. The method of claim 33 wherein said production tool comprises an endless belt.
48. A method of preparing a coated abrasive article comprising the step of fully curing the shaped, handleable structure of claim 33.
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US492993A | 1993-01-14 | 1993-01-14 | |
US08/004929 | 1993-01-14 |
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US (1) | US5435816A (en) |
EP (1) | EP0679117B1 (en) |
JP (1) | JP2004148500A (en) |
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AT (1) | ATE197689T1 (en) |
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CA (1) | CA2153891C (en) |
DE (1) | DE69426325T2 (en) |
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WO (1) | WO1994015752A1 (en) |
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1993
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1994
- 1994-01-03 ES ES94906495T patent/ES2151924T3/en not_active Expired - Lifetime
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- 1994-01-03 CN CN94190949A patent/CN1084242C/en not_active Expired - Lifetime
- 1994-01-03 AT AT94906495T patent/ATE197689T1/en active
- 1994-01-03 EP EP94906495A patent/EP0679117B1/en not_active Expired - Lifetime
- 1994-01-03 DE DE69426325T patent/DE69426325T2/en not_active Expired - Lifetime
- 1994-01-03 WO PCT/US1994/000032 patent/WO1994015752A1/en active IP Right Grant
- 1994-01-03 CA CA002153891A patent/CA2153891C/en not_active Expired - Lifetime
- 1994-01-03 AU AU60185/94A patent/AU675828B2/en not_active Ceased
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2003
- 2003-12-03 JP JP2003404522A patent/JP2004148500A/en active Pending
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AU675828B2 (en) | 1997-02-20 |
WO1994015752A1 (en) | 1994-07-21 |
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US5435816A (en) | 1995-07-25 |
JPH08505572A (en) | 1996-06-18 |
ES2151924T3 (en) | 2001-01-16 |
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