CA2059338C - Polyisocyanates containing allophanate and isocyanurate groups, a process for their production and their use in two-component coating compositions - Google Patents
Polyisocyanates containing allophanate and isocyanurate groups, a process for their production and their use in two-component coating compositions Download PDFInfo
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- CA2059338C CA2059338C CA002059338A CA2059338A CA2059338C CA 2059338 C CA2059338 C CA 2059338C CA 002059338 A CA002059338 A CA 002059338A CA 2059338 A CA2059338 A CA 2059338A CA 2059338 C CA2059338 C CA 2059338C
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
- C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/30—Only oxygen atoms
- C07D251/34—Cyanuric or isocyanuric esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/02—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only
- C08G18/022—Polymeric products of isocyanates or isothiocyanates of isocyanates or isothiocyanates only the polymeric products containing isocyanurate groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/7806—Nitrogen containing -N-C=0 groups
- C08G18/7818—Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups
- C08G18/7837—Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups containing allophanate groups
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
Abstract
The present invention is directed to a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based on the reaction product of an organic diisocyanate having (cyclo)aliphatic bound isocyanate groups and a monoalcohol containing 1 to 5 carbon atoms.
The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO
content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 by a) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups b) adding 0.01 to 0.5 moles, per mole of organic diisocyanate, of a monoalcohol containing 1 to 5 carbon atoms to the organic diisocyanate prior to or during the trimerization reaction of step a) and c) terminating the trimerization reaction at the desired degree of trimerization by adding a catalyst poison and/or by thermally deactivating the catalyst.
Finally, the present invention is directed to the use of these polyisocyanate mixtures, optionally in blocked form, as an isocyanate component in the two-component coating compositions.
Mo3555
The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO
content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 by a) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups b) adding 0.01 to 0.5 moles, per mole of organic diisocyanate, of a monoalcohol containing 1 to 5 carbon atoms to the organic diisocyanate prior to or during the trimerization reaction of step a) and c) terminating the trimerization reaction at the desired degree of trimerization by adding a catalyst poison and/or by thermally deactivating the catalyst.
Finally, the present invention is directed to the use of these polyisocyanate mixtures, optionally in blocked form, as an isocyanate component in the two-component coating compositions.
Mo3555
Description
_. ~~~~~~8 Mo-3555 POLYISOCYANATES CONTAINING ALLOPHANATE AND ISOCYANURATE
GROUPS, A PROCESS FOR THEIR PRODUCTION AND THEIR USE
IN TWO-COMPONENT COATING COMPOSITIONS
BACKGROUND OF THE INVENTION
Field of the Invention The present invention is directed to polyisocyanates which contain allophanate groups and isocyanurate groups and have a low viscosity and improved compatibility with polar and slightly polar solvents and isocyanate-reactive components.
The present invention is also directed to a process for the production of these polyisocyanates and their use in two-component coating compositions.
Description of the Prior Art Polyisocyanates containing isocyanurate groups are known and disclosed in U.S. Patents 3,487,080, 3,996,223, 4,324,879 and 4,412,073. While these polyisocyanates possess many outstanding properties, they do require improvement in two areas. First, the viscosity of commercially available polyisocyanates containing isocyanurate groups needs to be reduced in order to reduce the amount of solvent which is necessary to obtain a suitable processing viscosity.
Presently, there are an increasing number of government regulations which limit the amount of volatile solvents which may be present in coating systems. Therefore, isacyanurate ' group-containing polyisocyanates may be precluded from certain applications because it is not possible to reduce the viscosity of these polyisocyanates to a suitable processing viscosity without using high amounts of solvent. Second, the isocyanurate group-containing polyisocyanates do not possess sufficient compatibility with highly branched polyester co-reactants as evidenced by the gloss and distinctness of image readings obtained from coatings prepared from these reactants.
Mo3555 ~0 as~'~~
_2_ It has been proposed in U.S. Patent 4,801,663 to reduce the viscosity of isocyanurate group-containing polyisocyanates prepared from 1,6-hexamethylene diisocyanate (HDI). By terminating the reaction at a very low degree of trimerization higher contents of the monoisocyanurate of HDI
are obtained and the quantity of polyisocyanates containing more than one isocyanuruate ring is reduced. Because these latter polyisocyanates have a much higher viscosity than the monoisocyanurate, the resulting polyisocyanates have a reduced viscosity. However, a significant disadvantage of this system is that because the reaction is terminated at a very low degree of trimerization, the overall yield is very low and the amount of HDI which must be separated from the product is substantially increased. In other words the small reduction in viscosity is offset by a significant increase in the production cost of the product. Further, the resulting product does not possess optimum compatibility with highly branched polyester resins.
Accordingly, it is an object of the present invention to provide polyisocyanates which have a reduced viscosity and improved compatibility with crosslinked polyester co-reactants, while possessing the desirable properties of known polyisocyanates containing isocyanurate groups. It is an additional object of the present invention to provide polyisocyanates which may be produced at reasona.bae production costs and which are obtained in high yields. Surprisingly, these objectives may be achieved in accordance with the present invention as described hereinafter by the incorporation of specific monoalcohols before or during the trimerization process in order to produce a polyisocyanate containing isocyanurate and allophanate groups.
U.S. Patents 4,582,888, 4,604,418, 4,647,623, 4,789,705 are directed the incorporation of various diols in order to improve the compatibility of the resulting polyisocyanates with certain solvents and co-reactants. While Mo3555 ._ ~ 2~~~~~8 the use of diols may improve the compatibility of the polyisocyanates, the diols do not reduce the viscosity of the polyisocyanurates for a given yield.
Many of these references as well as those previously set forth disclose the use of monoalcohols or glycols as co-catalysts for the trimerization reaction. However, none of these references suggest the incorporation of allophanate groups to reduce the viscosity of polyisocyanates containing isocyanurate groups. Further, these references teach that the use of these cocatalysts should be kept to a minimum since the resulting urethane groups reduce the drying time of coatings prepared from the polyisocyanates. In particular, U.S. Patent 4,582,888 cautions against the use of any amount of monoalcohol which is in excess of that needed to dissolve the catalyst.
Japanese Publication 61-151179 discloses the use of monoalcohols containing 6 to 9 carbon atoms as co-catalysts for trimerization catalysts which do not trimerize HDI in the absence of a co-catalyst.
SUMMARY OF THE INVENTION
The present invention is directed to a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based-ofl the reaction product of an organic diisocyanate having (cyclo)aliphatic bound isocyanate groups and a monoalcohol containing 1 to 5 carbon atoms.
The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO
content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 by Mo3555 ~Q~4~3~
a) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups b) adding 0.01 to 0.5 moles, per mole of organic diisocyanate, of a monoalcohol containing 1 to 5 carbon atoms to the organic diisocyanate prior to or during the trimerization reaction of step a) and c) terminating the trimerization reaction at the desired degree of trimerization by adding a catalyst poison and/or by thermally deactivating the catalyst.
Finally, the present invention is directed to the use of these polyisocyanate mixtures, optionally in blocked form, as an isocyanate component in two-component coating compositions.
DETAILED DESCRIPTION OF THE INDENTION
In accordance with the present invention the term "monoisocyanurate" means a polyisocyanate containing one isocyanurate group and formed from three diisocyanate molecules, and the term "polyisocyanurate" means a polyisocyanate containing more than one isocyanurate group.
The term "monoallophanate" means a polyisocyanate containing one allophanate group and formed from two diisocyanate molecules and 1 monoalcohol molecule, and the term "polyallophanate" means a polyisocyanate containing more than one allophanate group. The term "(cyclo)aliphatif ally bound isocyanate groups" means aliphatically and/or cycloaliphatically bound isocyanate groups.
Examples of suitable diisocyanates to be used as starting materials for preparing the polyisocyanates according to the present invention are organic diisocyanates represented by the formula R(NCO)2 wherein R represents an organic group obtained by removing the isocyanate groups from an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups and a molecular Mo3555 weight of 112 to 1,000, preferably 140 to 400. Preferred diisocyanates for the process according to the invention are those represented by the above formula wherein R represents a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, a divalent cycloaliphatic hydrocarbon group having from 5 to 15 carbon atoms or a divalent araliphatic hydrocarbon group having from 7 to 15 carbon atoms. Examples of the organic diisocyanates which are particularly suitable for the process include 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 2,2,4-trimethyl-1, 6-hexamethylene diisocyanate, 1,12-dodecamethylene diisocyanate, cyclohexane-1,3- and -1,4-diisocyanate, 1-isocyanato-2-isocyanatomethyl cyclopentane, 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane (isophorone diisocyanate or IPDI), bis-(4-isocyanatocyclohexyl)-methane, 1,3- and 1,4-bis(isocyanatomethyl)-cyclohexane, bis-(4-isocyanato-3-methyl-cyclohexyl)-methane, a,a,a',a'-tetramethyl-1,3- and/or -1,4-xylylene diisocyanate, 1-isocyanato-1-methyl-4(3)-isocyanatomethyl cyclohexane, and 2,4- and/or 2,6-hexahydrotoluylene diisocyanate. Mixtures of diisocyanates may also be used. Preferred diisocyanates are 1,6-hexamethylene diisocyanate, isophorone diisocyanate and bis-(4-isocyanatocyclohexyl)-methane. 1,6-hexamethylene diisocyanate (HDI) is especially preferred.
It is also possible in accordance with the present invention to use blends of the previously mentioned diisocyanates with monoisocyanates or polyisocyanates having 3 or more isocyanate groups, provided that the isocyanate groups are (cyclo)aliphatically bound.
In accordance with the present invention it is preferred to treat the starting diisocyanates by bubbling an inert gas such as nitrogen through the starting diisocyanate in order to reduce the content of carbon dioxide.
This process is discussed in German Offenlegungsschrift 3,806,276.
Mo3555 A
Trimerization catalysts which are suitable for the process according to the invention include those previously known such as phosphines of the type described in DE-OS 1,935,763; alkali phenolates of the type described in GB-PS 1,391,066 or GB-PS 1,386,399; aziridine derivatives in combination with tertiary amines of the type described in U.S. Patent 3,919,218; quaternary ammonium carboxylates of the type described in U.S. Patents 4,454,317 and 4,801,663; quaternary ammonium phenolates with a zwitterionic structure of the type described in U.S. Patent 4,335,219;
ammonium phosphonates and phosphates of the type described in U.S.
Patent 4,499,253; alkali carboxylates of the type described in DE-OS
3,219,608; basic alkali metal salts complexed with acyclic organic compounds as described in U.S. Patent 4,379,905 such as potassium acetate complexed with a polyethylene glycol which contains an average of 5 to 8 ethylene oxide units; basic alkali metal salts complexed with crown ethers as described in U.S. Patent 4,487,928; aminosilyl group-containing compounds such as aminosilanes, diaminosilanes, silylureas and silazanes as described in U.S. Patent 4,412,073; and mixtures of alkali metal fluorides and quaternary ammonium or phosphonium salts as described in U.S. Patent 4,992,548. Also suitable, though less preferred, are Mannich bases, for example, those based on nonylphenol, formaldehyde and dimethylamine of the type described in U.S. Patents 3,996,223 and 4,115,373.
Particularly suitable as catalysts for the process according to the invention are quaternary ammoniium hydroxides corresponding to the formula R3(+) R2- IN-Ra (OI-~(_) R~
as described in U.S. Patent 4,324,879 and German Offenlegungsschriften 2,806,731 and 2,901,479. Preferred Mo3555 2~~s~~8 _, _ quaternary ammonium hydroxides are those wherein the radicals R1 to R4 represent identical or different alkyl groups having from 1 to 20, preferably from 1 to 4 carbon atoms, which may optionally be substituted by hydroxyl groups. Two of the radicals R1 to R4 may form a heterocyclic ring having from 3 to 5 carbon atoms together with the nitrogen atom and optionally with a further nitrogen or oxygen atom. Also the radicals R1 to R3 in each case may represent ethylene radicals which form a bicyclic triethylene diamine structure together with the quaternary nitrogen atom and a further tertiary nitrogen atom, provided that the radical R4 then represents a hydroxyalkyl group having from 2 to 4 carbon atoms in which the hydroxyl group is preferably arranged in a 2-position to the quaternary nitrogen atom. The hydroxyl-substituted radical or the hydroxyl-substituted radicals may also contain other substituents, particularly C1 to C4-alkoxy substituents.
The production of these quaternary ammonium catalysts takes place in known manner by reacting a tertiary amine with an alkylene oxide in an aqueous-alcoholic medium (c.f. US-P
3,995,997, col. 2, lines 19-44). Examples of suitable tertiary amines include trimethylamine, tributylamine, 2-dimethylaminoethanol, triethanolamine, dodecyldimethylamine, N,N-dimethylcyclohexylamine, N-methylpyrrolidine, N-methylmorpholine and 1,4-diazabicyclo-[2,2,2]-octane.
Examples of suitable alkylene oxides include ethyl ene oxide, propylene oxide, 1,2-butylene oxide, styrene oxide and methoxy, ethoxy or phenoxy propylene oxide. The most preferred catalysts from this group are N,N,N-trimethyl-N-(2-hydroxyethyl)-ammonium hydroxide and N,N,N-trimethyl-N-(2-hydroxypropyl)ammonium hydroxide. Another most preferred catalyst is N,N,N-trimethyl-N-benzyl-ammonium hydroxide.
The trimerization of the starting diisocyanates may be carried out in the absence or in the presence of solvents which are inert to isocyanate groups. Depending on the area of application of the products according to the invention, low to Mo3555 _g_ medium-boiling solvents or high-boiling solvents can be used.
Suitable solvents include esters such as ethyl acetate or butyl acetate; ketones such as acetone or butanone; aromatic compounds such as toluene or xylene; halogenated hydrocarbons such as methylene chloride and trichloroethylene; ethers such as diisopropylether; and alkanes such as cyclohexane, petroleum ether or ligroin.
The trimerization catalysts are generally used in quantities of about 0.0005 to 5% by weight, preferably about 0.002 to 2% by weight, based on the diisocyanate used. If, for example, a preferred catalyst such as N,N,N-trimethyl-N-(2-hydroxypropyl)-ammonium hydroxide is used, then quantities of about 0.0005 to 1% by weight, preferably about 0.001 to 0.02 by weight, based on starting diisocyanate, are generally sufficient. The catalysts may be used in pure form or in solution. The previously named solvents which are inert to isocyanate groups are suitable as solvents, depending on the type of catalysts. Dimethyl formamide or dimethyl sulphoxide may also be used as solvents for the catalysts.
The simultaneous use of co-catalysts is possible in the process according to the invention, but not necessary. All substances from which a polymerizing effect on isocyanates is known are suitable as co-catalysts such as those described in DE-OS 2,806,731. The co-catalysts are optionally used in a lesser amount on a weight basis in relation to the amount of the trimerization catalyst.
In accordance with the present invention urethane groups and subsequently allophanate groups are incorporated into the polyisocyanates by the use of monoalcohols. The monoalcohols may be linear, branched or cyclic and contain 1 to 5, preferably 2 to 5 and more preferably 3 to 5 carbon atoms.
The monoalcohols may optionally contain ether groups. Examples of suitable monoalcohols include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol and tert. butanol, n-pentanol, 2-hydroxy pentane, 3-hydroxy pentane, the isomeric Mo3555 ~o~s~~~
_g_ methyl butyl alcohols, the isomeric dimethyl propyl alcohols, neopentyl alcohol, ethoxy methanol, methoxy ethanol, ethoxy ethanol, the isomeric methoxy or ethoxy propanols, the isomeric propoxy methanols and ethanols, the isomeric methoxy butanols, the isomeric butoxy methanols and furfuralcohol. The molar ratio of monoalcohol to diisocyanate is about 0.01 to 0.5, preferably about 0.04 to 0.2.
The reaction temperature for isocyanurate and allophanate formation in accordance with the present invention is about 10 to 160°C, preferably about 50 to 150°C and more preferably about 90 to 120°C.
The process according to the invention may take place either batchwise or continuously, for example, as described below. The starting diisocyanate is introduced with the exclusion of moisture and optionally with an inert gas into a suitable stirred vessel or tube and optionally mixed with a solvent which is inert to isocyanate groups such as toluene, butyl acetate, diisopropylether or cyclohexane. The previously described monoalcohol may be introduced into the reaction vessel in accordance with several embodiments. The monoalcohol may be prereacted with the diisocyanate to form urethane groups prior to introducing the diisocyanate into the reaction vessel;
the monoalcohol may be mixed with the diisocyanate and introduced into the reaction vessel; the monoalcohol may be separately added to the reaction vessel either before or after, preferably after, the diisocyanate is added; or the catalyst may be dissolved in the monoalcohol prior to introducing the solution into the reaction vessel.
The polyisocyanates according to the invention may also be prepared by blending polyisocyanates containing isocyanurate groups with monoallophonates.
At a temperature of about 60°C and in the presence of the required catalyst or catalyst solution the trimerization begins and is indicated by an exothermic reaction. As the reaction temperature increases the conversion rate of urethane Mo3555 -lo-groups to allophanate groups increases faster than the formation of isocyanurate groups. At temperatures above 85°C
when the desired degree of trimerization is achieved, the urethane groups are generally completely converted to allophanate groups and the product, after removal of unreacted monomer and any solvent present has a low viscosity relative to the yield which is obtained. At temperatures below 85°C at the same degree of isocyanate group consumption, some urethane groups remain unconverted and the product has a slightly higher, but still low viscosity relative to the yield which is obtained. The progress of the reaction is followed by determining the NCO content by a suitable method such as titration, refractive index or IR analysis. Thus, the reaction may be terminated at the desired degree of trimerization. The termination of the trimerization reaction can take place, for example, at an NCO content of about 15% to 47%, preferably about 20 to 40%.
The termination of the trimerization reaction can take place, for example, by the addition of a catalyst-poison of the type named by way of example in the above-mentioned literature references. For example, when using basic catalysts the reaction is terminated by the addition of a quantity, which is at least equivalent to the catalyst quantity, of an acid chloride such as benzoyl chloride. When using heat-labile catalysts, for example, the previously described quaternary ammonium hydroxides, poisoning of the catalyst by the addition of a catalyst-poison may be dispensed with, since these catalysts decompose in the course of the reaction. When using such catalysts, the catalyst quantity and the reaction 3o temperature are preferably selected such that the catalyst which continuously decomposes is totally decomposed when the desired degree of trimerization is reached. The quantity of catalyst or reaction temperature which is necessary to achieve this decomposition can be determined by a preliminary experiment. It is also possible initially to use a lesser Mo3555 ~~~s~~8 quantity of a heat sensitive catalyst than is necessary to achieve the desired degree of trimerization and to subsequently catalyze the reaction by a further incremental addition of catalyst, whereby the quantity of catalyst added later is calculated such that when the desired degree of trimerization is achieved, the total quantity of catalyst is spent. The use of suspended catalysts is also possible. These catalysts are removed after achieving the desired degree of trimerization by filtering the reaction mixture.
The working-up of the reaction mixture, optionally after previous separation of insoluble catalyst constituents, may take place in various ways depending upon how the reaction was conducted and the area of application for the isocyanates.
It is possible to use the polyisocyanates according to the invention which have been produced in solution directly as a lacquer raw material, without a purification stage, if it is not necessary to reduce the free monomer content. Any solvent used during trimerization reaction and any unreacted monomer present in the polyisocyanate product can also be removed by 2p distillation in known manner. The product generally contains a total of less than 2, preferably less than 1% of free (unreacted) monomeric diisocyanates. The products according to the invention have a viscosity of less than 10,000 mPa.s, preferably less than 2000 mPa.s and more preferably less than 1300 mPa.s. _ The products according to the present invention are polyisocyanates containing isocyanurate groups and allophanate groups. The products may also contain residual urethane groups which have not been converted to allophanate groups depending upon the temperature maintained during the reaction and the degree of isocyanate group consumption. The ratio of monoisocyanurate groups to monoallophanate groups present in the polyisocyanates according to the invention is about 10:1 to 1:5, preferably about 5:1 to 1:2.
Mo3555 2~~9~~~
The products according to the invention are valuable starting materials for the production of polyisocyanate polyaddition products by reaction with compounds containing at least two isocyanate reactive groups. Preferred products are most preferably one or two-component polyurethane coatings.
Preferred reaction partners for the products according to the invention, which may optionally be present in blocked form, are the polyhydroxy polyesters, polyhydroxy polyethers, polyhydroxy polyacrylates and optionally low molecular weight, polyhydric alcohols known from polyurethane coatings technology. Polyamines, particularly in blocked form, for example as polyketimines or oxazolidines are also suitable reaction partners for the products according to the invention.
The amounts of the polyisocyanates according to the invention and their reaction partners are selected to provide equivalent ratio of isocyanate groups (whether present in blocked or unblocked form) to isocyanate-reactive groups of about 0.8 to 3, preferably about 0.9 to 1.1.
To accelerate hardening, the coating compositions may contain known polyurethane catalysts, e.g., tertiary amines such as triethylamine, pyridine, methyl pyridine, benzyl dimethylamine, N,N-dimethylamino cyclohexane, N-methylpiperidine, pentamethyl diethylene triamine, 1,4-diaza-bicyclo[2,2,2]-octane and N,N'-dimethyl piperazine;
or metal salts such as iron(III)-chloride, zinc ~-~loride, zinc-2-ethyl caproate, tin(II)-ethyl caproate, dibutyltin(IV)-dilaurate and molybdenum glycolate.
The products according to the invention are also valuable starting materials for two-component polyurethane stoving enamels in which the isocyanate groups are used in a form blocked by known blocking agents. The blocking reaction is carried out in known manner by reacting the isocyanate groups with suitable blocking agents, preferably at an elevated temperature (e.g. about 40 to 160°C), and optionally in the Mo3555 ~~~9~38 presence of a suitable catalyst, for example, the previously described tertiary amines or metal salts.
Suitable blocking agents include monophenols such as phenol, the cresols, the trimethylphenols and the tert. butyl phenols; tertiary alcohols such as tert. butanol, tert. amyl alcohol and dimethylphenyl carbinol; compounds which easily form enols such as acetoacetic ester, acetyl acetone and malonic acid derivatives, e.g.malonic acid diethylester;
secondary aromatic amines such as N-methyl aniline, the N-methyl toluidine, N-phenyl toluidine and N-phenyl xylidine;
imides such as succinimide; lactams such as E-caprolactam and b-valerolactam; oximes such as butanone oxime and cyclohexanone oxime mercaptans such as methyl mercaptan, ethyl mercaptan, butyl mercaptan, 2-mercaptobenzthiazole, a-naphthyl mercaptan and dodecyl mercaptan; and triazoles such as 1H-1,2,4-triazole.
The coating compositions may also contain other additives such as pigments, dyes, fillers, levelling agents and solvents. The coating compositions may be applied to the substrate to be coated in solution or from the melt by conventional methods such as painting, rolling, pouring or spraying.
The coating compositions containing the polyisocyanates according to the invention provide coatings which adhere surprisingly well to a metallic base, and are particularly light-fast, color stable in the presence of heat and very resistant to abrasion. Furthermore, they are characterized by high hardness, elasticity, very good resistance to chemicals, high gloss, excellent weather resistance and good pigmenting qualities. The polyisocyanates according to the invention also possess good compatibility with highly branched polyester resins.
The invention is further illustrated, but is not intended to be limited by the following examples in which all parts and percentages are by weight unless otherwise specified.
Mo3555 ~~~9~~8 The use of ppm in the tables refers to the amount of catalyst excluding solvent.
EXAMPLES
CATALYST SOLUTION I
j H3 ; H3 +
CH3-N-CH2-CH-OH OH 35% in Ethanol CATALYST SOLUTION II
CH3 +
CH3-~N -CH2 0~ OH 4.4% in 2-Butanol ~H3 CATALYST SOLUTION III
(iH2)7CH3 ~ +
CH3 - N -(CH2)7CH3 F 9.4% in 2-Ethyl-1,3-Hexanediol (CH2)7CH3 To a 500 ml 3-neck flask equipped with a gas bubbler, mechanical stirrer, thermometer and condenser was added 301.7 grams of hexamethylene diisocyanate and 13.3 grams of 1-butanol. The stirred mixture was heated for 1 hour at 60°C
while dry nitrogen was bubbled through the reaction mixture.
The temperature of the urethane reaction mixture was then raised to 90°C. To the reaction mixture at 90°C was added 0.214 grams (30 ppm) of catalyst solution II. When the reaction mixture reached an NCO content of 34.8%, the reaction was stopped by adding 0.214 grams (30 ppm) of di-(2-ethylhexyl) phosphate. The excess monomer was removed by thin film evaporation to provide an almost colorless clear liquid having a viscosity of 630 mPa.s (25°C), an NCO content of 19.7% and a free monomer (HDI) content of 0.35%. The yield was 48.6%.
Mo3555 y ;. i Using the procedure described in Example 1, the following reactions were carried out using the specified reagents and conditions set forth in 'fable 1.
Mo3555 r In t0 O CO ~ Op .-~ IW D 01 ~
00 .-~~ N .-~ 1~ V ~ N Iw V
7- ~ LL')~ M M M ~ 10 ~ Ll7M
O
O
f-~ 01 O O ~--~~ O O O O O O
N M M N N et M N M N N
O O O O O O O O O O O
aU
WV N
2N e0 O O O O O O O O O O O
I
d'~ 1~ O1 N M M O N N .-~ N
+~
~7 r0 00 01 1n t0 tl7 00 l0 N fw M O
E
N
0 ~ ~ O ~ M 01 LIf N O l0 N
U
Z O~ 01 01 -, r-, O 00 00 01 p r~ ..~.-~ N N N .--y --~ r~ ~ N
X
r r C1 01 01 01 Iw -r <f' 01 .--i 01 ~O
r0 f O
r ~' M ~ 01 01 00 N 01 M O 01 U
X
UJIZ M M M M M M M N M M M
Z
~
J
m a 0 0 ~n o o ~ o o ~n o 0 U ~ M N et M L1~M M N M t0 O
e0 ~--m --m--m -.m -- m~ r~ ~ ~ ~ ~-r ~
U ~--m --m., ~ m -r f.r ~-, ~.r ~.,~
d O O O O O O O O O-- O O
~ t0 01 C~ ~D C~ C~ p~ p~ O~ O~ ~O
U
H
r r r r r O O O O O
C C C C C
!lf fC f~ f~ f0 +~ +~ +~ +~ +~
O O
O O
i Q Q Q Q
C i i ~
N
O S S Z Z Z
O r-~ .-r ~ N N
+~
E
r L
L O - . O . . O - O . O
+~ si' N l0 lC N
r0 O O O O O O
e0 LL r-~ W --~ ~ rr ~
r 'd N t0 (p N
X
I
4J N M et t,c~tD 1'w00 01 ~
Nb3555 ~~~g~~~
-m-r M O N 1~ O M N tl)N Op ~ M
O
N O ~ fw fw Ln .--itw 00 Iw Iw M et'M W et ~ 1L~ et ~ at ~ lC'f d N
1- i -~ O O O O O O O O O O O
lL Q N ~ ~ ~ N N N N O N 1f')i I
er S O O O O O O O O O O O O
d U
D Lrf UJ C~ N
N
d V1 etT O O O t0 O O O O O O O O
d r i-~ Iw M ~ O 1~ M .~ fw 00 OO Ln M
d ~ e0 tD O t0 ~ Iw Iw M t0 00 ~ 1~ 01 ~
H
N
O N O ~' O 01 C1 01 01 O O 01 I
Z ~ a ~ O C1 01 01 C1 O O 01 O
N N N N r~ r~ ~ r--~N N ~--~N
n O X
C r r r f~ ~ 00 ~ M Iw O 00 00 t~ Iw f~ 00 Il7 +~ C O
C ~ U 01 00 O ~ ~ t11M ~ et aT ~ et X
O 6i Z M M ~ M M M M M M M M M
d' U
W
..J eo 1n tn O O O offO O O O O O
U tC tCfM Q1 st M M et O O O
Q --t~ M
H
O
~
r~ r-r r~ m --m .r r.m--~ ~ +~ ~ t.-m.~
U wm --~m --m r ~..i~ ~..m-r ~.a U
a x o 0 0 0 0 0 0 0 0 0 0 0 a c~ a~ c~ ~c o~ o, o~ ~o a~ ~o o, o, a~
r r O O O
C C C O i eC e0 O C O
+~ +~ r O L
C N Q D ~ +~
1 ~ r r O +~ Z Z Z 4J
N N O a i C) .C
i r~ O . _ Q . . . . . . . O ~ ~
ets N ~ ,a.~
O ~ O O O r d Li r r-r ~ .-r ~
N et' C.'3 E
XI M ~ ~7 l0 t~ 00 01 O ~ N M d 4J r~ r-H~ ,H wa rm -~ N N N N N
Nb3555 ~Q~~3,38 r N
3w y h. N
7- et' tn d H d V S. ~p O N
~
dw O O
_ d V
p a 4J tn d U N
v1 d N e~ O O
~--nr +~ ~ O
2' ~ e~ OW O
E
r-1 V I
o\ ~ N
O
X
C r r r e0 O O
~
+~ C O
C r V In ch X
O LL M M
Z
2' V
W +~
J ~ O
V p1 H
d tC ~--m r W
V H --m r V
a X O O _ N
H
X
O r S O
+~ r C
d O t0 f C t r.~ ~r +~
~ e0 i C p ~ p O
N a ~~ =
ue i. .
E m s L+-~ OM a 001 rtf O tff O ~ O
lL ~ Lt) r N
XI W p LU N N
Mr~3555 To a 500 ml 3-neck flask equipped with a gas bubbler, mechanical stirrer, thermometer and condenser was added 227.0 grams of hexamethylene diisocyanate and 10.0 grams of 1-butanol. The stirred mixture was heated rapidly to 90°C
while dry nitrogen was bubbled through the reaction mixture.
As soon as the reaction mixture reached 90°C, 0.24 grams of catalyst solution II was added. When the percent NCO of the reaction mixture had reached 34.7%, the reaction was stopped by adding 0.22 grams (45 ppm) of di-(2-ethylhexyl) phosphate. The excess monomer was removed by thin film evaporation to provide an almost colorless clear liquid having a viscosity of 740 mPa.s (25°C), an NCO content of 19.7% and a free monomer (HDI) content of 0.30%. The yield was 50.5%.
Using the procedure described in Example 27, the following reactions were carried out using the specified reagents and conditions set forth in Table 2.
w.. -20- 205338 r ~p tD M O O
. .
00 W O f~ h.
C~' O
U i. r-i .--~N ~ O O
O 4- ~ ~ M N ~ N Iw D D
~
3v= O O O O O O
d.
U
LN tn d U N O O O O O O
N
2 N rtf ct 1~ M fw 00 N
I
r-~~ +~ 00 M OJ t0 01 2' ~ cff .-i ~
H
N
O O ~ O~ Op -r Gp I
Z O O O~ 01 .-N N .-~ .-r N
X
r r O~ ~ -r Ol O O
~
C O
N ~ U et off u'1 et 00 ttf X
GROUPS, A PROCESS FOR THEIR PRODUCTION AND THEIR USE
IN TWO-COMPONENT COATING COMPOSITIONS
BACKGROUND OF THE INVENTION
Field of the Invention The present invention is directed to polyisocyanates which contain allophanate groups and isocyanurate groups and have a low viscosity and improved compatibility with polar and slightly polar solvents and isocyanate-reactive components.
The present invention is also directed to a process for the production of these polyisocyanates and their use in two-component coating compositions.
Description of the Prior Art Polyisocyanates containing isocyanurate groups are known and disclosed in U.S. Patents 3,487,080, 3,996,223, 4,324,879 and 4,412,073. While these polyisocyanates possess many outstanding properties, they do require improvement in two areas. First, the viscosity of commercially available polyisocyanates containing isocyanurate groups needs to be reduced in order to reduce the amount of solvent which is necessary to obtain a suitable processing viscosity.
Presently, there are an increasing number of government regulations which limit the amount of volatile solvents which may be present in coating systems. Therefore, isacyanurate ' group-containing polyisocyanates may be precluded from certain applications because it is not possible to reduce the viscosity of these polyisocyanates to a suitable processing viscosity without using high amounts of solvent. Second, the isocyanurate group-containing polyisocyanates do not possess sufficient compatibility with highly branched polyester co-reactants as evidenced by the gloss and distinctness of image readings obtained from coatings prepared from these reactants.
Mo3555 ~0 as~'~~
_2_ It has been proposed in U.S. Patent 4,801,663 to reduce the viscosity of isocyanurate group-containing polyisocyanates prepared from 1,6-hexamethylene diisocyanate (HDI). By terminating the reaction at a very low degree of trimerization higher contents of the monoisocyanurate of HDI
are obtained and the quantity of polyisocyanates containing more than one isocyanuruate ring is reduced. Because these latter polyisocyanates have a much higher viscosity than the monoisocyanurate, the resulting polyisocyanates have a reduced viscosity. However, a significant disadvantage of this system is that because the reaction is terminated at a very low degree of trimerization, the overall yield is very low and the amount of HDI which must be separated from the product is substantially increased. In other words the small reduction in viscosity is offset by a significant increase in the production cost of the product. Further, the resulting product does not possess optimum compatibility with highly branched polyester resins.
Accordingly, it is an object of the present invention to provide polyisocyanates which have a reduced viscosity and improved compatibility with crosslinked polyester co-reactants, while possessing the desirable properties of known polyisocyanates containing isocyanurate groups. It is an additional object of the present invention to provide polyisocyanates which may be produced at reasona.bae production costs and which are obtained in high yields. Surprisingly, these objectives may be achieved in accordance with the present invention as described hereinafter by the incorporation of specific monoalcohols before or during the trimerization process in order to produce a polyisocyanate containing isocyanurate and allophanate groups.
U.S. Patents 4,582,888, 4,604,418, 4,647,623, 4,789,705 are directed the incorporation of various diols in order to improve the compatibility of the resulting polyisocyanates with certain solvents and co-reactants. While Mo3555 ._ ~ 2~~~~~8 the use of diols may improve the compatibility of the polyisocyanates, the diols do not reduce the viscosity of the polyisocyanurates for a given yield.
Many of these references as well as those previously set forth disclose the use of monoalcohols or glycols as co-catalysts for the trimerization reaction. However, none of these references suggest the incorporation of allophanate groups to reduce the viscosity of polyisocyanates containing isocyanurate groups. Further, these references teach that the use of these cocatalysts should be kept to a minimum since the resulting urethane groups reduce the drying time of coatings prepared from the polyisocyanates. In particular, U.S. Patent 4,582,888 cautions against the use of any amount of monoalcohol which is in excess of that needed to dissolve the catalyst.
Japanese Publication 61-151179 discloses the use of monoalcohols containing 6 to 9 carbon atoms as co-catalysts for trimerization catalysts which do not trimerize HDI in the absence of a co-catalyst.
SUMMARY OF THE INVENTION
The present invention is directed to a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein the allophanate groups are formed from urethane groups which are based-ofl the reaction product of an organic diisocyanate having (cyclo)aliphatic bound isocyanate groups and a monoalcohol containing 1 to 5 carbon atoms.
The present invention is also directed to a process for the production of a polyisocyanate mixture having an NCO
content of 10 to 47% by weight, having a viscosity of less than 10,000 mPa.s and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 by Mo3555 ~Q~4~3~
a) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups b) adding 0.01 to 0.5 moles, per mole of organic diisocyanate, of a monoalcohol containing 1 to 5 carbon atoms to the organic diisocyanate prior to or during the trimerization reaction of step a) and c) terminating the trimerization reaction at the desired degree of trimerization by adding a catalyst poison and/or by thermally deactivating the catalyst.
Finally, the present invention is directed to the use of these polyisocyanate mixtures, optionally in blocked form, as an isocyanate component in two-component coating compositions.
DETAILED DESCRIPTION OF THE INDENTION
In accordance with the present invention the term "monoisocyanurate" means a polyisocyanate containing one isocyanurate group and formed from three diisocyanate molecules, and the term "polyisocyanurate" means a polyisocyanate containing more than one isocyanurate group.
The term "monoallophanate" means a polyisocyanate containing one allophanate group and formed from two diisocyanate molecules and 1 monoalcohol molecule, and the term "polyallophanate" means a polyisocyanate containing more than one allophanate group. The term "(cyclo)aliphatif ally bound isocyanate groups" means aliphatically and/or cycloaliphatically bound isocyanate groups.
Examples of suitable diisocyanates to be used as starting materials for preparing the polyisocyanates according to the present invention are organic diisocyanates represented by the formula R(NCO)2 wherein R represents an organic group obtained by removing the isocyanate groups from an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups and a molecular Mo3555 weight of 112 to 1,000, preferably 140 to 400. Preferred diisocyanates for the process according to the invention are those represented by the above formula wherein R represents a divalent aliphatic hydrocarbon group having from 4 to 18 carbon atoms, a divalent cycloaliphatic hydrocarbon group having from 5 to 15 carbon atoms or a divalent araliphatic hydrocarbon group having from 7 to 15 carbon atoms. Examples of the organic diisocyanates which are particularly suitable for the process include 1,4-tetramethylene diisocyanate, 1,6-hexamethylene diisocyanate, 2,2,4-trimethyl-1, 6-hexamethylene diisocyanate, 1,12-dodecamethylene diisocyanate, cyclohexane-1,3- and -1,4-diisocyanate, 1-isocyanato-2-isocyanatomethyl cyclopentane, 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane (isophorone diisocyanate or IPDI), bis-(4-isocyanatocyclohexyl)-methane, 1,3- and 1,4-bis(isocyanatomethyl)-cyclohexane, bis-(4-isocyanato-3-methyl-cyclohexyl)-methane, a,a,a',a'-tetramethyl-1,3- and/or -1,4-xylylene diisocyanate, 1-isocyanato-1-methyl-4(3)-isocyanatomethyl cyclohexane, and 2,4- and/or 2,6-hexahydrotoluylene diisocyanate. Mixtures of diisocyanates may also be used. Preferred diisocyanates are 1,6-hexamethylene diisocyanate, isophorone diisocyanate and bis-(4-isocyanatocyclohexyl)-methane. 1,6-hexamethylene diisocyanate (HDI) is especially preferred.
It is also possible in accordance with the present invention to use blends of the previously mentioned diisocyanates with monoisocyanates or polyisocyanates having 3 or more isocyanate groups, provided that the isocyanate groups are (cyclo)aliphatically bound.
In accordance with the present invention it is preferred to treat the starting diisocyanates by bubbling an inert gas such as nitrogen through the starting diisocyanate in order to reduce the content of carbon dioxide.
This process is discussed in German Offenlegungsschrift 3,806,276.
Mo3555 A
Trimerization catalysts which are suitable for the process according to the invention include those previously known such as phosphines of the type described in DE-OS 1,935,763; alkali phenolates of the type described in GB-PS 1,391,066 or GB-PS 1,386,399; aziridine derivatives in combination with tertiary amines of the type described in U.S. Patent 3,919,218; quaternary ammonium carboxylates of the type described in U.S. Patents 4,454,317 and 4,801,663; quaternary ammonium phenolates with a zwitterionic structure of the type described in U.S. Patent 4,335,219;
ammonium phosphonates and phosphates of the type described in U.S.
Patent 4,499,253; alkali carboxylates of the type described in DE-OS
3,219,608; basic alkali metal salts complexed with acyclic organic compounds as described in U.S. Patent 4,379,905 such as potassium acetate complexed with a polyethylene glycol which contains an average of 5 to 8 ethylene oxide units; basic alkali metal salts complexed with crown ethers as described in U.S. Patent 4,487,928; aminosilyl group-containing compounds such as aminosilanes, diaminosilanes, silylureas and silazanes as described in U.S. Patent 4,412,073; and mixtures of alkali metal fluorides and quaternary ammonium or phosphonium salts as described in U.S. Patent 4,992,548. Also suitable, though less preferred, are Mannich bases, for example, those based on nonylphenol, formaldehyde and dimethylamine of the type described in U.S. Patents 3,996,223 and 4,115,373.
Particularly suitable as catalysts for the process according to the invention are quaternary ammoniium hydroxides corresponding to the formula R3(+) R2- IN-Ra (OI-~(_) R~
as described in U.S. Patent 4,324,879 and German Offenlegungsschriften 2,806,731 and 2,901,479. Preferred Mo3555 2~~s~~8 _, _ quaternary ammonium hydroxides are those wherein the radicals R1 to R4 represent identical or different alkyl groups having from 1 to 20, preferably from 1 to 4 carbon atoms, which may optionally be substituted by hydroxyl groups. Two of the radicals R1 to R4 may form a heterocyclic ring having from 3 to 5 carbon atoms together with the nitrogen atom and optionally with a further nitrogen or oxygen atom. Also the radicals R1 to R3 in each case may represent ethylene radicals which form a bicyclic triethylene diamine structure together with the quaternary nitrogen atom and a further tertiary nitrogen atom, provided that the radical R4 then represents a hydroxyalkyl group having from 2 to 4 carbon atoms in which the hydroxyl group is preferably arranged in a 2-position to the quaternary nitrogen atom. The hydroxyl-substituted radical or the hydroxyl-substituted radicals may also contain other substituents, particularly C1 to C4-alkoxy substituents.
The production of these quaternary ammonium catalysts takes place in known manner by reacting a tertiary amine with an alkylene oxide in an aqueous-alcoholic medium (c.f. US-P
3,995,997, col. 2, lines 19-44). Examples of suitable tertiary amines include trimethylamine, tributylamine, 2-dimethylaminoethanol, triethanolamine, dodecyldimethylamine, N,N-dimethylcyclohexylamine, N-methylpyrrolidine, N-methylmorpholine and 1,4-diazabicyclo-[2,2,2]-octane.
Examples of suitable alkylene oxides include ethyl ene oxide, propylene oxide, 1,2-butylene oxide, styrene oxide and methoxy, ethoxy or phenoxy propylene oxide. The most preferred catalysts from this group are N,N,N-trimethyl-N-(2-hydroxyethyl)-ammonium hydroxide and N,N,N-trimethyl-N-(2-hydroxypropyl)ammonium hydroxide. Another most preferred catalyst is N,N,N-trimethyl-N-benzyl-ammonium hydroxide.
The trimerization of the starting diisocyanates may be carried out in the absence or in the presence of solvents which are inert to isocyanate groups. Depending on the area of application of the products according to the invention, low to Mo3555 _g_ medium-boiling solvents or high-boiling solvents can be used.
Suitable solvents include esters such as ethyl acetate or butyl acetate; ketones such as acetone or butanone; aromatic compounds such as toluene or xylene; halogenated hydrocarbons such as methylene chloride and trichloroethylene; ethers such as diisopropylether; and alkanes such as cyclohexane, petroleum ether or ligroin.
The trimerization catalysts are generally used in quantities of about 0.0005 to 5% by weight, preferably about 0.002 to 2% by weight, based on the diisocyanate used. If, for example, a preferred catalyst such as N,N,N-trimethyl-N-(2-hydroxypropyl)-ammonium hydroxide is used, then quantities of about 0.0005 to 1% by weight, preferably about 0.001 to 0.02 by weight, based on starting diisocyanate, are generally sufficient. The catalysts may be used in pure form or in solution. The previously named solvents which are inert to isocyanate groups are suitable as solvents, depending on the type of catalysts. Dimethyl formamide or dimethyl sulphoxide may also be used as solvents for the catalysts.
The simultaneous use of co-catalysts is possible in the process according to the invention, but not necessary. All substances from which a polymerizing effect on isocyanates is known are suitable as co-catalysts such as those described in DE-OS 2,806,731. The co-catalysts are optionally used in a lesser amount on a weight basis in relation to the amount of the trimerization catalyst.
In accordance with the present invention urethane groups and subsequently allophanate groups are incorporated into the polyisocyanates by the use of monoalcohols. The monoalcohols may be linear, branched or cyclic and contain 1 to 5, preferably 2 to 5 and more preferably 3 to 5 carbon atoms.
The monoalcohols may optionally contain ether groups. Examples of suitable monoalcohols include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol and tert. butanol, n-pentanol, 2-hydroxy pentane, 3-hydroxy pentane, the isomeric Mo3555 ~o~s~~~
_g_ methyl butyl alcohols, the isomeric dimethyl propyl alcohols, neopentyl alcohol, ethoxy methanol, methoxy ethanol, ethoxy ethanol, the isomeric methoxy or ethoxy propanols, the isomeric propoxy methanols and ethanols, the isomeric methoxy butanols, the isomeric butoxy methanols and furfuralcohol. The molar ratio of monoalcohol to diisocyanate is about 0.01 to 0.5, preferably about 0.04 to 0.2.
The reaction temperature for isocyanurate and allophanate formation in accordance with the present invention is about 10 to 160°C, preferably about 50 to 150°C and more preferably about 90 to 120°C.
The process according to the invention may take place either batchwise or continuously, for example, as described below. The starting diisocyanate is introduced with the exclusion of moisture and optionally with an inert gas into a suitable stirred vessel or tube and optionally mixed with a solvent which is inert to isocyanate groups such as toluene, butyl acetate, diisopropylether or cyclohexane. The previously described monoalcohol may be introduced into the reaction vessel in accordance with several embodiments. The monoalcohol may be prereacted with the diisocyanate to form urethane groups prior to introducing the diisocyanate into the reaction vessel;
the monoalcohol may be mixed with the diisocyanate and introduced into the reaction vessel; the monoalcohol may be separately added to the reaction vessel either before or after, preferably after, the diisocyanate is added; or the catalyst may be dissolved in the monoalcohol prior to introducing the solution into the reaction vessel.
The polyisocyanates according to the invention may also be prepared by blending polyisocyanates containing isocyanurate groups with monoallophonates.
At a temperature of about 60°C and in the presence of the required catalyst or catalyst solution the trimerization begins and is indicated by an exothermic reaction. As the reaction temperature increases the conversion rate of urethane Mo3555 -lo-groups to allophanate groups increases faster than the formation of isocyanurate groups. At temperatures above 85°C
when the desired degree of trimerization is achieved, the urethane groups are generally completely converted to allophanate groups and the product, after removal of unreacted monomer and any solvent present has a low viscosity relative to the yield which is obtained. At temperatures below 85°C at the same degree of isocyanate group consumption, some urethane groups remain unconverted and the product has a slightly higher, but still low viscosity relative to the yield which is obtained. The progress of the reaction is followed by determining the NCO content by a suitable method such as titration, refractive index or IR analysis. Thus, the reaction may be terminated at the desired degree of trimerization. The termination of the trimerization reaction can take place, for example, at an NCO content of about 15% to 47%, preferably about 20 to 40%.
The termination of the trimerization reaction can take place, for example, by the addition of a catalyst-poison of the type named by way of example in the above-mentioned literature references. For example, when using basic catalysts the reaction is terminated by the addition of a quantity, which is at least equivalent to the catalyst quantity, of an acid chloride such as benzoyl chloride. When using heat-labile catalysts, for example, the previously described quaternary ammonium hydroxides, poisoning of the catalyst by the addition of a catalyst-poison may be dispensed with, since these catalysts decompose in the course of the reaction. When using such catalysts, the catalyst quantity and the reaction 3o temperature are preferably selected such that the catalyst which continuously decomposes is totally decomposed when the desired degree of trimerization is reached. The quantity of catalyst or reaction temperature which is necessary to achieve this decomposition can be determined by a preliminary experiment. It is also possible initially to use a lesser Mo3555 ~~~s~~8 quantity of a heat sensitive catalyst than is necessary to achieve the desired degree of trimerization and to subsequently catalyze the reaction by a further incremental addition of catalyst, whereby the quantity of catalyst added later is calculated such that when the desired degree of trimerization is achieved, the total quantity of catalyst is spent. The use of suspended catalysts is also possible. These catalysts are removed after achieving the desired degree of trimerization by filtering the reaction mixture.
The working-up of the reaction mixture, optionally after previous separation of insoluble catalyst constituents, may take place in various ways depending upon how the reaction was conducted and the area of application for the isocyanates.
It is possible to use the polyisocyanates according to the invention which have been produced in solution directly as a lacquer raw material, without a purification stage, if it is not necessary to reduce the free monomer content. Any solvent used during trimerization reaction and any unreacted monomer present in the polyisocyanate product can also be removed by 2p distillation in known manner. The product generally contains a total of less than 2, preferably less than 1% of free (unreacted) monomeric diisocyanates. The products according to the invention have a viscosity of less than 10,000 mPa.s, preferably less than 2000 mPa.s and more preferably less than 1300 mPa.s. _ The products according to the present invention are polyisocyanates containing isocyanurate groups and allophanate groups. The products may also contain residual urethane groups which have not been converted to allophanate groups depending upon the temperature maintained during the reaction and the degree of isocyanate group consumption. The ratio of monoisocyanurate groups to monoallophanate groups present in the polyisocyanates according to the invention is about 10:1 to 1:5, preferably about 5:1 to 1:2.
Mo3555 2~~9~~~
The products according to the invention are valuable starting materials for the production of polyisocyanate polyaddition products by reaction with compounds containing at least two isocyanate reactive groups. Preferred products are most preferably one or two-component polyurethane coatings.
Preferred reaction partners for the products according to the invention, which may optionally be present in blocked form, are the polyhydroxy polyesters, polyhydroxy polyethers, polyhydroxy polyacrylates and optionally low molecular weight, polyhydric alcohols known from polyurethane coatings technology. Polyamines, particularly in blocked form, for example as polyketimines or oxazolidines are also suitable reaction partners for the products according to the invention.
The amounts of the polyisocyanates according to the invention and their reaction partners are selected to provide equivalent ratio of isocyanate groups (whether present in blocked or unblocked form) to isocyanate-reactive groups of about 0.8 to 3, preferably about 0.9 to 1.1.
To accelerate hardening, the coating compositions may contain known polyurethane catalysts, e.g., tertiary amines such as triethylamine, pyridine, methyl pyridine, benzyl dimethylamine, N,N-dimethylamino cyclohexane, N-methylpiperidine, pentamethyl diethylene triamine, 1,4-diaza-bicyclo[2,2,2]-octane and N,N'-dimethyl piperazine;
or metal salts such as iron(III)-chloride, zinc ~-~loride, zinc-2-ethyl caproate, tin(II)-ethyl caproate, dibutyltin(IV)-dilaurate and molybdenum glycolate.
The products according to the invention are also valuable starting materials for two-component polyurethane stoving enamels in which the isocyanate groups are used in a form blocked by known blocking agents. The blocking reaction is carried out in known manner by reacting the isocyanate groups with suitable blocking agents, preferably at an elevated temperature (e.g. about 40 to 160°C), and optionally in the Mo3555 ~~~9~38 presence of a suitable catalyst, for example, the previously described tertiary amines or metal salts.
Suitable blocking agents include monophenols such as phenol, the cresols, the trimethylphenols and the tert. butyl phenols; tertiary alcohols such as tert. butanol, tert. amyl alcohol and dimethylphenyl carbinol; compounds which easily form enols such as acetoacetic ester, acetyl acetone and malonic acid derivatives, e.g.malonic acid diethylester;
secondary aromatic amines such as N-methyl aniline, the N-methyl toluidine, N-phenyl toluidine and N-phenyl xylidine;
imides such as succinimide; lactams such as E-caprolactam and b-valerolactam; oximes such as butanone oxime and cyclohexanone oxime mercaptans such as methyl mercaptan, ethyl mercaptan, butyl mercaptan, 2-mercaptobenzthiazole, a-naphthyl mercaptan and dodecyl mercaptan; and triazoles such as 1H-1,2,4-triazole.
The coating compositions may also contain other additives such as pigments, dyes, fillers, levelling agents and solvents. The coating compositions may be applied to the substrate to be coated in solution or from the melt by conventional methods such as painting, rolling, pouring or spraying.
The coating compositions containing the polyisocyanates according to the invention provide coatings which adhere surprisingly well to a metallic base, and are particularly light-fast, color stable in the presence of heat and very resistant to abrasion. Furthermore, they are characterized by high hardness, elasticity, very good resistance to chemicals, high gloss, excellent weather resistance and good pigmenting qualities. The polyisocyanates according to the invention also possess good compatibility with highly branched polyester resins.
The invention is further illustrated, but is not intended to be limited by the following examples in which all parts and percentages are by weight unless otherwise specified.
Mo3555 ~~~9~~8 The use of ppm in the tables refers to the amount of catalyst excluding solvent.
EXAMPLES
CATALYST SOLUTION I
j H3 ; H3 +
CH3-N-CH2-CH-OH OH 35% in Ethanol CATALYST SOLUTION II
CH3 +
CH3-~N -CH2 0~ OH 4.4% in 2-Butanol ~H3 CATALYST SOLUTION III
(iH2)7CH3 ~ +
CH3 - N -(CH2)7CH3 F 9.4% in 2-Ethyl-1,3-Hexanediol (CH2)7CH3 To a 500 ml 3-neck flask equipped with a gas bubbler, mechanical stirrer, thermometer and condenser was added 301.7 grams of hexamethylene diisocyanate and 13.3 grams of 1-butanol. The stirred mixture was heated for 1 hour at 60°C
while dry nitrogen was bubbled through the reaction mixture.
The temperature of the urethane reaction mixture was then raised to 90°C. To the reaction mixture at 90°C was added 0.214 grams (30 ppm) of catalyst solution II. When the reaction mixture reached an NCO content of 34.8%, the reaction was stopped by adding 0.214 grams (30 ppm) of di-(2-ethylhexyl) phosphate. The excess monomer was removed by thin film evaporation to provide an almost colorless clear liquid having a viscosity of 630 mPa.s (25°C), an NCO content of 19.7% and a free monomer (HDI) content of 0.35%. The yield was 48.6%.
Mo3555 y ;. i Using the procedure described in Example 1, the following reactions were carried out using the specified reagents and conditions set forth in 'fable 1.
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Mr~3555 To a 500 ml 3-neck flask equipped with a gas bubbler, mechanical stirrer, thermometer and condenser was added 227.0 grams of hexamethylene diisocyanate and 10.0 grams of 1-butanol. The stirred mixture was heated rapidly to 90°C
while dry nitrogen was bubbled through the reaction mixture.
As soon as the reaction mixture reached 90°C, 0.24 grams of catalyst solution II was added. When the percent NCO of the reaction mixture had reached 34.7%, the reaction was stopped by adding 0.22 grams (45 ppm) of di-(2-ethylhexyl) phosphate. The excess monomer was removed by thin film evaporation to provide an almost colorless clear liquid having a viscosity of 740 mPa.s (25°C), an NCO content of 19.7% and a free monomer (HDI) content of 0.30%. The yield was 50.5%.
Using the procedure described in Example 27, the following reactions were carried out using the specified reagents and conditions set forth in Table 2.
w.. -20- 205338 r ~p tD M O O
. .
00 W O f~ h.
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U i. r-i .--~N ~ O O
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r $..
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I
lrb3~55 205~33g APPLICATION EXAMPLES
White pigmented coatings were prepared from the polyisocyanate of Example 32 (Coating A), a polyisocyanurate crosslinker based on HDI
with a viscosity of ca. 3000 mPa~s @ 25°C as described in U.S. Patent 4,324,879 (Coating B) and a polyisocyanurate crosslinker with a viscosity of ca. 1200 cps as described in U.S. Patent 4,801,663 (Coating C). The coreactant portion of the paint, which also contains pigment, additives and catalyst, was based on a hydroxyl functional branched polyester which was present as a 75% solids solution in propylene glycol monomethyl ether acetate. The polyester polyol had an equivalent weight of about 211 and an OH number of about 266, and was prepared from 19.4 parts of 2-ethylhexanoic acid, 165.6 parts of trimethylol propane, 990.1 parts of phthalic acid anhydride and 495.0 parts of adipic acid.
The composition of the coreactant portion is set forth in Table 3. To form the coatings, sufficient polyisocyanate was added to the coreactant portion to provide an equivalent ratio of isocyanate groups to hydroxyl groups of 1.1 to 1Ø The drying/hardness development data as well as film properties are set forth in Table 4.
Weight (in grams) Polyester polyol 329.08 Bykumen~* 3.83 Titanium Dioxide (R-960 available from Du Pont) 368.89 Propylene glycol monoethyl ether acetate 272.69 MPA-2000X2 9.61 CAB 3813 13.19 *trade-mark Mo3555 _.. 259338 Dibutyltin dilaurate (1% in PMA) 2.69 1 - a pigment wetting agent available from Byk Chemie 2 - an anti-settling agent available from NL Industries 3 - a cellulose acetate butyrate levelling agent available from Eastman Chemical as a 10% solution in propylene glycol monomethyl ether acetate Mo-3555 _23_ 2059338 Coatings Properties Coating A B C
pbw of polyisocyanate per 100 pbw pigmented coreactant 27.1 26.4 25.9 Dry Times (Gardner Dry Meter) Set-to-Touch 3.9 3.5 3.1 Hard Dry 6.1 5.8 5.8 Hardness Development by Pendulum Measurement after 1 day 122 115 102 4 days 186 186 171 7 days 200 202 189 60 Gloss (Gardner) 92 88 89 Distinctness of Image 96 33 79 Impact Resistance Direct 30 30 30 Reverse 10 <5 <5 Chemical Resistance (24 ot tests) hr. sp 50% Sulfuric Acid NE NE NE
37% Hydrochloric Acid S 24 B 6 Hrs B Hrs Hrs 6 Toluene NE NE NE
Glacial Acetic Acid D 24 B 4 Hrs_ _ Hrs Hrs D
Xylene NE NE NE
Isopropyl Alcohol NE NE NE
Concentrated NaOH NE NE NE
S=Softened D=Destroyed B=Blistered NE=No Effect Although the inventi on has detail been described in in the foregoing for the se of it to be purpo illustration, is understood that such detailsolely and is for that that purpose variations can be made thereinby thoseskilled art in the Mo-3555 205933.8 without departing from the spirit and scope of the invention except as it may be limited by the claims.
Mo-3555
J
m a 0 0 0 0 ~
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tff a-~ r-~ ~ r~ ~ rr U H ~ ~--~r.~ ~ r-i r.~
U
a CG E O O O O O O
01 t0 tG 01 10 C1 H
r r r O O O
C C C r t0 t~ t0 O
+~ +~ C
O O O
v--~ f-r i--~ L
m m C N D D O D +~
~ ~ i ~ O Z Z Z Z 4J
+~ N .~ N
r $..
L +~ O - O . O O et r0 ~ et ~
O n7 O O C O
lL r e-~ .-~ ~ .~ d' !Y ~ <f' X 00 01 O ~ N M
LU N N M M M M
I
lrb3~55 205~33g APPLICATION EXAMPLES
White pigmented coatings were prepared from the polyisocyanate of Example 32 (Coating A), a polyisocyanurate crosslinker based on HDI
with a viscosity of ca. 3000 mPa~s @ 25°C as described in U.S. Patent 4,324,879 (Coating B) and a polyisocyanurate crosslinker with a viscosity of ca. 1200 cps as described in U.S. Patent 4,801,663 (Coating C). The coreactant portion of the paint, which also contains pigment, additives and catalyst, was based on a hydroxyl functional branched polyester which was present as a 75% solids solution in propylene glycol monomethyl ether acetate. The polyester polyol had an equivalent weight of about 211 and an OH number of about 266, and was prepared from 19.4 parts of 2-ethylhexanoic acid, 165.6 parts of trimethylol propane, 990.1 parts of phthalic acid anhydride and 495.0 parts of adipic acid.
The composition of the coreactant portion is set forth in Table 3. To form the coatings, sufficient polyisocyanate was added to the coreactant portion to provide an equivalent ratio of isocyanate groups to hydroxyl groups of 1.1 to 1Ø The drying/hardness development data as well as film properties are set forth in Table 4.
Weight (in grams) Polyester polyol 329.08 Bykumen~* 3.83 Titanium Dioxide (R-960 available from Du Pont) 368.89 Propylene glycol monoethyl ether acetate 272.69 MPA-2000X2 9.61 CAB 3813 13.19 *trade-mark Mo3555 _.. 259338 Dibutyltin dilaurate (1% in PMA) 2.69 1 - a pigment wetting agent available from Byk Chemie 2 - an anti-settling agent available from NL Industries 3 - a cellulose acetate butyrate levelling agent available from Eastman Chemical as a 10% solution in propylene glycol monomethyl ether acetate Mo-3555 _23_ 2059338 Coatings Properties Coating A B C
pbw of polyisocyanate per 100 pbw pigmented coreactant 27.1 26.4 25.9 Dry Times (Gardner Dry Meter) Set-to-Touch 3.9 3.5 3.1 Hard Dry 6.1 5.8 5.8 Hardness Development by Pendulum Measurement after 1 day 122 115 102 4 days 186 186 171 7 days 200 202 189 60 Gloss (Gardner) 92 88 89 Distinctness of Image 96 33 79 Impact Resistance Direct 30 30 30 Reverse 10 <5 <5 Chemical Resistance (24 ot tests) hr. sp 50% Sulfuric Acid NE NE NE
37% Hydrochloric Acid S 24 B 6 Hrs B Hrs Hrs 6 Toluene NE NE NE
Glacial Acetic Acid D 24 B 4 Hrs_ _ Hrs Hrs D
Xylene NE NE NE
Isopropyl Alcohol NE NE NE
Concentrated NaOH NE NE NE
S=Softened D=Destroyed B=Blistered NE=No Effect Although the inventi on has detail been described in in the foregoing for the se of it to be purpo illustration, is understood that such detailsolely and is for that that purpose variations can be made thereinby thoseskilled art in the Mo-3555 205933.8 without departing from the spirit and scope of the invention except as it may be limited by the claims.
Mo-3555
Claims (19)
1. A process for the production of a polyisocyanate mixture having an NCO content of 10 to 47% by weight and a viscosity of less than 1300 mPa~s at 25°C and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5 which comprises a) catalytically trimerizing a portion of the isocyanate groups of an organic diisocyanate having (cyclo)aliphatically bound isocyanate groups in the presence of a trimerization catalyst with the exception of phosphines and Mannich bases, b) adding 0.01 to 0.5 moles, per mole of said organic diisocyanate, of a monoalcohol containing 1 to 5 carbon atoms to said organic diisocyanate prior to or during the trimerization reaction of step a), c) terminating the trimerization reaction at the desired degree of trimerization by adding a catalyst poison and/or by thermally deactivating the catalyst and d) removing unreacted organic diisocyanate by distillation to a content of less than 1 % by weight, based on the weight of the polyisocyanate mixture.
2. The process of Claim 1 wherein said organic diisocyanate comprises 1,6-hexamethylene diisocyanate.
3. The process of Claim 1 wherein said monoalcohol contains 3 or 4 carbon atoms.
4. The process of Claim 2 wherein said monoalcohol contains 3 or 4 carbon atoms.
5. The process of Claim 1 wherein said trimerization catalyst contains quaternary ammonium groups or aminosilyl groups.
6. The process of Claim 2 wherein said trimerization catalyst contains quaternary ammonium groups or aminosilyl groups.
7. The process of Claim 3 wherein said trimerization catalyst contains quaternary ammonium groups or aminosilyl groups.
8. The process of Claim 4 wherein said trimerization catalyst contains quaternary ammonium groups or aminosilyl groups.
9. The process of Claim 1, 2, 3, 4, 5, 6, 7 or 8 wherein said polyisocyanate mixture has a molar ratio of monoisocyanurates to monallophanates of 5:1 to 1:2.
10. The process of Claim 1, 2, 3, 4, 5, 6, 7 or 8 which comprises adding 0.04 to 0.2 moles of said monoalcohol per mole of said organic diisocyanate.
11. The process of Claim 9 which comprises adding 0.04 to 0.2 moles of said monoalcohol per mole of said organic diisocyanate.
12. A polyisocyanate mixture having an NCO content of 10 to 47% by weight, a viscosity of less than 1300 mPa~s at 25°C, a content of unreacted organic diisocyanate of less than 1 % by weight and containing isocyanurate and allophanate groups in a molar ratio of monoisocyanurates to monoallophanates of 10:1 to 1:5, wherein said allophanate groups are formed from urethane groups which comprise the reaction product of an organic diisocyanate and a monoalcohol containing 1 to 5 carbon atoms.
13. The polyisocyanate mixture of Claim 12 wherein said organic diisocyanate comprises 1,6-hexamethylene diisocyanate.
14. The polyisocyanate mixture of Claim 12 wherein said monoalcohol contains 3 or 4 carbon atoms.
15. The polyisocyanate of Claim 13 wherein said monoalcohol contains 3 or 4 carbon atoms.
16. The polyisocyanate mixture of Claim 12, 13, 14 or 15 wherein said polyisocyanate mixture has a molar ratio of monoisocyanurates to monoallophanates of 5:1 to 1:2.
17. The polyisocyanate mixture of Claim 12, 13, 14 or 15 in which said reaction product is prepared at a molar ratio of said monoalcohol to said polyisocyanate of 0.04:1 to 0.2:1.
18. The polyisocyanate mixture of Claim 16 in which said reaction product is prepared at a molar ratio of said monoalcohol to said polyisocyanate of 0.04:1 to 0.2:1.
19. A two-component coating composition comprising the polyisocyanate mixture of Claim 12, 13, 14 or 15 and a compound containing isocyanate-reactive groups.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/644,174 US5124427A (en) | 1991-01-22 | 1991-01-22 | Polyisocyanates containing allophanate and isocyanurate groups, a process for their production and their use in two-component coating compositions |
US07/644,174 | 1991-01-22 |
Publications (2)
Publication Number | Publication Date |
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CA2059338A1 CA2059338A1 (en) | 1992-07-23 |
CA2059338C true CA2059338C (en) | 2003-08-19 |
Family
ID=24583766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002059338A Expired - Lifetime CA2059338C (en) | 1991-01-22 | 1992-01-14 | Polyisocyanates containing allophanate and isocyanurate groups, a process for their production and their use in two-component coating compositions |
Country Status (6)
Country | Link |
---|---|
US (1) | US5124427A (en) |
EP (1) | EP0496208B1 (en) |
JP (1) | JP2670934B2 (en) |
CA (1) | CA2059338C (en) |
DE (1) | DE69214848T2 (en) |
ES (1) | ES2093721T3 (en) |
Families Citing this family (107)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2087386T3 (en) * | 1991-10-02 | 1996-07-16 | Bayer Ag | POLYISOCYANATES CONTAINING ALOPHANATE AND ISOCIANURATE GROUPS, A PROCEDURE FOR THEIR PRODUCTION AND USE IN TWO-COMPONENT COATING COMPOSITIONS. |
EP0566037A2 (en) * | 1992-04-14 | 1993-10-20 | Takeda Chemical Industries, Ltd. | Polyisocyanates, their production and use |
US5258482A (en) * | 1992-06-12 | 1993-11-02 | Miles Inc. | Polyisocyanates containing allophanate and isocyanurate groups, a process for their production from a mixture of diisocyanates and their use in two-component coating compositions |
US5380792A (en) * | 1993-04-19 | 1995-01-10 | Miles Inc. | Two-component aqueous polyurethane dispersions having improved pot life and coatings prepared therefrom |
US5370908A (en) * | 1993-05-24 | 1994-12-06 | Olin Corporation | Low VOC, heat-curable, one-component and two-component coating compositions based on organic polyisocyanates |
US5290902A (en) * | 1993-06-22 | 1994-03-01 | Miles Inc. | Polyisocyanates containing allophanate and isocyanurate groups, a process for their production from cyclic diisocyanates and their use in two-component coating compositions |
DE4335796A1 (en) * | 1993-10-20 | 1995-04-27 | Bayer Ag | Lacquer polyisocyanates and their use |
US5496642A (en) * | 1994-05-09 | 1996-03-05 | Olin Corporation | Low VOC, fluorocompound-containing one-component and two-component coating compositions for slippery coatings |
US5516873A (en) * | 1994-07-11 | 1996-05-14 | Bayer Corporation | Polyisocyanate/polyamine mixtures and their use for the production of polyurea coatings |
DE4426131A1 (en) | 1994-07-22 | 1996-01-25 | Bayer Ag | Non-fading, solvent-free polyurethane coating agents and their use |
US5489704A (en) | 1994-08-29 | 1996-02-06 | Bayer Corporation | Polyisocyanate/polyamine mixtures and their use for the production of polyurea coatings |
US5576411A (en) * | 1994-09-14 | 1996-11-19 | Bayer Corporation | Low surface energy polyisocyanates and their use in one-or two component coating compositions |
DE4432647A1 (en) | 1994-09-14 | 1996-03-21 | Bayer Ag | Oligourethanes containing 1,3-dioxan-2-one groups |
US5614605A (en) * | 1994-12-19 | 1997-03-25 | Bayer Corporation | Rigid polyurethanes based on allophanate-modified aliphatic and/or cycloaliphatic polyisocyanurates |
US5561200A (en) | 1995-05-23 | 1996-10-01 | Bayer Corporation | Blocked polyisocyanates with improved thermal stability |
US5606001A (en) * | 1995-09-14 | 1997-02-25 | Bayer Corporation | Polyisocyanates containing allophanate groups and optionally isocyanurate groups |
US5691440A (en) * | 1995-10-05 | 1997-11-25 | Arco Chemical Technonogy, L.P. | Catalyst and process for producing isocyanate trimers |
DE19542119C1 (en) | 1995-11-11 | 1997-02-13 | Herberts Gmbh | Coating agents and process for the production of multilayer coatings |
US5646227A (en) | 1996-02-01 | 1997-07-08 | Bayer Corporation | Low surface energy polyisocyanates and their use in one- or two-component coating compositions |
US5789519A (en) * | 1996-04-12 | 1998-08-04 | Bayer Corporation | High viscosity, high equivalent weight polyisocyanate mixtures containing allophanate and isocyanurate groups and their use in coating compositions |
US5714564A (en) * | 1996-08-21 | 1998-02-03 | Bayer Corporation | Low viscosity polyisocyanates prepared from monomeric triisocyanates |
US5739251A (en) * | 1997-03-27 | 1998-04-14 | Bayer Corporation | Low viscosity, ethylenically unsaturated polyurethanes containing allophanate groups |
US5955609A (en) * | 1997-12-31 | 1999-09-21 | Bayer Corporation | Trimer catalyst system for aliphatic and aromatic isocyanates |
US6028158A (en) * | 1997-12-31 | 2000-02-22 | Bayer Corporation | Freeze-stable allophanate-modified toluene diisocyanate trimers |
DE19858733A1 (en) | 1998-12-18 | 2000-06-21 | Bayer Ag | Aqueous, two component polyurethane coating material, for e.g. plastic, includes elastomeric and thermoplastic polymer polyols |
DE19927411A1 (en) * | 1999-06-16 | 2000-12-21 | Bayer Ag | Lightfast polyisocyanates with good solubility in non-polar solvents |
DE19961926A1 (en) | 1999-12-22 | 2001-07-05 | Basf Coatings Ag | Mixtures of substances curable thermally with actinic radiation and their use |
US6906147B2 (en) * | 2002-03-20 | 2005-06-14 | Cyclics Corporation | Catalytic systems |
US7256241B2 (en) | 2000-01-21 | 2007-08-14 | Cyclics Corporation | Methods for polymerizing macrocyclic polyester oligomers using catalyst promoters |
DE10005228A1 (en) | 2000-02-05 | 2001-08-09 | Basf Ag | Polyisocyanates with allophanate groups derived from alicyclic alkane diols |
DE10008928A1 (en) | 2000-02-25 | 2001-08-30 | Degussa | Transparent or pigmented powder coatings with crosslinkers made from hydroxyalkylamides and blocked, non-aromatic polyisocyanates |
DE10041634C2 (en) | 2000-08-24 | 2002-10-17 | Basf Coatings Ag | Aqueous dispersion and its use for the production of coating materials, adhesives and sealants curable thermally and with actinic radiation |
US7750109B2 (en) | 2000-09-01 | 2010-07-06 | Cyclics Corporation | Use of a residual oligomer recyclate in the production of macrocyclic polyester oligomer |
US6525164B2 (en) * | 2000-09-01 | 2003-02-25 | Cyclics Corporation | Methods for converting linear polyesters to macrocyclic oligoester compositions and macrocyclic oligoesters |
US7767781B2 (en) | 2000-09-01 | 2010-08-03 | Cyclics Corporation | Preparation of low-acid polyalkylene terephthalate and preparation of macrocyclic polyester oligomer therefrom |
DE10120083A1 (en) * | 2001-04-17 | 2003-01-30 | Nmi Univ Tuebingen | Pair of measuring electrodes, biosensor with such a pair of measuring electrodes and method of manufacture |
US7304123B2 (en) * | 2001-06-27 | 2007-12-04 | Cyclics Corporation | Processes for shaping macrocyclic oligoesters |
CA2451767A1 (en) * | 2001-06-27 | 2003-01-09 | Cyclics Corporation | Isolation, formulation, and shaping of macrocyclic oligoesters |
DE10139262C1 (en) | 2001-08-09 | 2003-01-02 | Basf Coatings Ag | A rheological adjuvant, useful for coating materials, adhesives, and sealing compositions, contains a urea derivative obtained by reaction of isocyanate with sterically hindered primary and secondary monoamines |
WO2003027163A1 (en) * | 2001-09-20 | 2003-04-03 | Asahi Kasei Chemicals Corporation | Polyisocyanate composition having allophanate group and high-solid coating material |
US6787632B2 (en) * | 2001-10-09 | 2004-09-07 | Cyclics Corporation | Organo-titanate catalysts for preparing pure macrocyclic oligoesters |
US6852905B2 (en) | 2001-11-15 | 2005-02-08 | Paragon Trade Brands, Inc. | Fluid handling layers made from foam and absorbent articles containing same |
DE10241299A1 (en) | 2002-09-04 | 2004-03-25 | Basf Ag | Radiation-curable polyurethanes with capped amino groups |
US6797799B1 (en) | 2003-04-02 | 2004-09-28 | Bayer Materialscience Llc | High 2,4′-diphenylmethane diisocyanate content prepolymers |
US20050137374A1 (en) * | 2003-12-17 | 2005-06-23 | Roesler Richard R. | Two-component water-borne adhesive |
US20050137322A1 (en) * | 2003-12-17 | 2005-06-23 | Roesler Richard R. | Silane modified two-component polyurethane coating |
US20050158131A1 (en) * | 2004-01-20 | 2005-07-21 | Markusch Peter H. | Geotextile/polyurethane composites based on blocked isocyanate compositions |
DE102004003495A1 (en) * | 2004-01-23 | 2005-08-11 | Bayer Materialscience Ag | Orthoestergruppenhaltige binder |
DE102004009818A1 (en) * | 2004-02-28 | 2005-09-15 | Bayer Materialscience Ag | Hydrophobic, low viscosity polyols |
DE102004015985A1 (en) * | 2004-04-01 | 2005-10-20 | Bayer Materialscience Ag | Discoloration-stable polyether allophanates |
DE102004015983A1 (en) * | 2004-04-01 | 2005-10-20 | Bayer Materialscience Ag | Process for the preparation of polyether allophanates using zinc compounds as catalysts |
DE102004015982A1 (en) * | 2004-04-01 | 2005-10-20 | Bayer Materialscience Ag | Process for the preparation of polyisocyanate prepolymers with allophanate structural units |
US20050277732A1 (en) * | 2004-06-14 | 2005-12-15 | Yu Poli C | Two-component coating composition |
US20050288430A1 (en) * | 2004-06-25 | 2005-12-29 | Gindin Lyubov K | Polyurethane dispersions with high acid content |
US20050288431A1 (en) * | 2004-06-25 | 2005-12-29 | Gindin Lyubov K | Polyurethane dispersion prepared from a high acid functional polyester |
US20060014890A1 (en) * | 2004-07-14 | 2006-01-19 | Zielinski David P | Polyisocyanates with improved compatibility with high hydroxyl content polyols |
US20060011295A1 (en) * | 2004-07-14 | 2006-01-19 | Karsten Danielmeier | Aspartic ester functional compounds |
US20060223968A1 (en) * | 2005-03-31 | 2006-10-05 | Bayer Materialscience Llc | Allophonate modified polyisocyanates |
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DE102005045228A1 (en) | 2005-09-22 | 2007-04-05 | Basf Coatings Ag | Use of phosphonic diesters and diphosphonic diesters, and silane-containing, curable mixtures containing phosphonic and Diphosphonsäurediester |
WO2007034883A1 (en) * | 2005-09-22 | 2007-03-29 | Asahi Kasei Chemicals Corporation | Polyisocyanate composition and coating composition containing the same |
DE102005045150A1 (en) | 2005-09-22 | 2007-04-05 | Basf Coatings Ag | Use of phosphonic diesters and diphosphonic diesters and thermally curable mixtures containing phosphonic diester and Diphosphonsäurediester |
DE102005047562A1 (en) * | 2005-10-04 | 2007-04-05 | Bayer Materialscience Ag | Two-component coating system for production of flexible coatings on various substrates, contains a polyisocyanate prepolymer with allophanate-linked polyether groups and an aminofunctional polyaspartate ester as hardener |
BRPI0617366B1 (en) * | 2005-10-21 | 2018-01-23 | Asahi Kasei Chemicals Corporation | POLYOSOCYANATE COMPOSITION AND COATING COMPOSITION |
DE102005053661A1 (en) | 2005-11-10 | 2007-05-16 | Basf Coatings Ag | Repair films and their use |
US20070231577A1 (en) * | 2006-03-30 | 2007-10-04 | Basf Corporation | Coatings for polycarbonate windows |
EP2024455B1 (en) * | 2006-05-16 | 2018-04-04 | Coatings Foreign IP Co. LLC | Highly productive coating composition for automotive refinishing |
WO2008060330A2 (en) * | 2006-05-16 | 2008-05-22 | E. I. Du Pont De Nemours And Company | Ultraproductive coating composition using a chemically mixed isocyanate system |
DE102006024823A1 (en) | 2006-05-29 | 2007-12-06 | Basf Coatings Ag | Use of curable mixtures containing silane-containing compounds and phosphonic or Diphosphonsäurediester as adhesion promoters |
EP2075294A4 (en) | 2006-10-16 | 2011-11-23 | Asahi Kasei Chemicals Corp | Fluorine coating composition |
DE102007014720A1 (en) | 2007-03-23 | 2008-09-25 | Basf Coatings Japan Ltd., Yokohama | Phosphonate-containing two-component paint system, its preparation and use |
ES2400735T3 (en) | 2007-11-28 | 2013-04-11 | Basf Se | Liquid Stabilizer Mix |
US8415471B2 (en) * | 2007-11-29 | 2013-04-09 | Baver MaterialScience LLC | Flexible cycloaliphatic diisocyanate trimers |
JP5445451B2 (en) * | 2008-04-24 | 2014-03-19 | 日本ポリウレタン工業株式会社 | Polyisocyanate composition and two-component coating composition using the same |
JP5499474B2 (en) * | 2008-12-26 | 2014-05-21 | 日本ポリウレタン工業株式会社 | Curing agent composition for two-component curable paint |
DE102009005711A1 (en) | 2009-01-22 | 2010-07-29 | Bayer Materialscience Ag | Polyurethanvergussmassen |
DE102009005712A1 (en) | 2009-01-22 | 2010-07-29 | Bayer Materialscience Ag | Polyurethanvergussmassen |
DE102009019898A1 (en) | 2009-05-04 | 2010-11-11 | Fischerwerke Gmbh & Co. Kg | Multi-component synthetic mortar based on silane-terminated resins |
DE102009019899A1 (en) | 2009-05-04 | 2010-11-11 | Fischerwerke Gmbh & Co. Kg | Adhesives based on silane-terminated isocyanates |
US8765900B2 (en) * | 2009-08-27 | 2014-07-01 | Bayer Materialscience Llc | Aliphatic moisture-curable resins, coating compositions, and related processes |
EP2480542A1 (en) | 2009-09-26 | 2012-08-01 | Segetis, Inc. | Ketal lactones and stereospecific adducts of oxocarboxylic ketals with trimethylol compounds, polymers containing the same, methods of manufacture, and uses thereof |
CA2795335A1 (en) * | 2010-04-09 | 2011-10-13 | Bayer Materialscience Llc | Two-component, polyaspartic coating compositions |
DE102010060443A1 (en) | 2010-11-09 | 2012-05-10 | Fischerwerke Gmbh & Co. Kg | Resin for adhesives and coating materials based on silane-terminated resins with at least two starting materials |
JP6153293B2 (en) * | 2012-05-11 | 2017-06-28 | 旭化成株式会社 | Block polyisocyanate composition |
JP6043531B2 (en) * | 2012-07-25 | 2016-12-14 | 旭化成株式会社 | Polyisocyanate composition |
FR2995310B1 (en) * | 2012-09-07 | 2015-12-11 | Vencorex France | COMPOSITION OF ALLOPHANATE AND HYDROPHOBIC RESIN |
US10156352B2 (en) | 2013-04-19 | 2018-12-18 | Covestro Llc | In mold electronic printed circuit board encapsulation and assembly |
US10000686B2 (en) * | 2013-12-18 | 2018-06-19 | Covestro Llc | Methods for treating a well bore within an underground formation |
EP3183283A1 (en) | 2014-08-22 | 2017-06-28 | Covestro LLC | Processes for in-mold coating using a multi-cavity mold and substrates coated thereby |
CN107001558A (en) * | 2014-12-15 | 2017-08-01 | 三井化学株式会社 | Self-repairability polyurethane resin raw material, self-repairability polyurethane resin, self-repairability coating material, self-repairability elastomeric material, the manufacture method of the manufacture method of self-repairability polyurethane resin raw material and self-repairability polyurethane resin |
TW201704220A (en) | 2015-04-21 | 2017-02-01 | 科思創德意志股份有限公司 | Polyisocyanurate polymers and process for the production of polyisocyanurate polymers |
EP3286240A1 (en) | 2015-04-21 | 2018-02-28 | Covestro Deutschland AG | Solids based on polyisocvanurate polymers produced under adiabatic conditions |
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EP3286242A1 (en) | 2015-04-21 | 2018-02-28 | Covestro Deutschland AG | Polyisocyanurate plastics having high thermal stability |
CN107438635B (en) | 2015-04-21 | 2021-01-19 | 科思创德国股份有限公司 | Process for making polyisocyanurate plastics |
EP3507321B1 (en) | 2016-09-02 | 2022-03-02 | Covestro Intellectual Property GmbH & Co. KG | Process for producing polyisocyanurate plastics by means of phosphine catalysis |
CN114149564B (en) * | 2016-10-14 | 2023-07-25 | 旭化成株式会社 | Polyisocyanate composition, blocked polyisocyanate composition, hydrophilic polyisocyanate composition, coating composition and coating film |
ES2823248T3 (en) * | 2016-10-18 | 2021-05-06 | Covestro Intellectual Property Gmbh & Co Kg | Hard coatings with high chemical and mechanical stability |
WO2018073302A1 (en) * | 2016-10-18 | 2018-04-26 | Covestro Deutschland Ag | Coating of wires with catalytically crosslinked blocked polyisocyanates |
WO2018186886A1 (en) | 2017-04-07 | 2018-10-11 | Covestro Llc | Processes for in-mold coating of polymer substrates |
WO2018194572A1 (en) | 2017-04-19 | 2018-10-25 | Covestro Llc | Relective coatings and in-mold processes for their application to polymer substrates |
US20180346786A1 (en) | 2017-06-05 | 2018-12-06 | Covestro Llc | Methods and materials for refracturing a partially depleted oil and gas well |
WO2019032250A1 (en) | 2017-08-08 | 2019-02-14 | Covestro Llc | Polyurethanes for water shut-off in oil and gas wells |
CN107913730B (en) | 2017-11-30 | 2020-04-10 | 万华化学集团股份有限公司 | Imine type quaternary ammonium salt catalyst, preparation method thereof and polyisocyanate composition |
JP7326072B2 (en) * | 2019-09-02 | 2023-08-15 | 三井化学株式会社 | Polyisocyanate composition and method for producing the same |
CA3169148A1 (en) | 2020-03-04 | 2021-09-10 | Michel Lincker | Kit-of-parts for curable polyaspartic acid ester-based coating compositions |
EP4011928A1 (en) | 2020-12-09 | 2022-06-15 | Covestro Deutschland AG | Preparation of isocyanate-terminated urethane group-containing prepolymers |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1667309C3 (en) * | 1967-01-19 | 1978-10-26 | Takeda Chemical Industries, Ltd., Osaka (Japan) | Process for the production of isocyanate trimers !! |
DE2452532C3 (en) * | 1974-11-06 | 1978-08-24 | Bayer Ag, 5090 Leverkusen | Process for the preparation of polyisocyanates with an isocyanurate structure |
CA1112243A (en) * | 1978-09-08 | 1981-11-10 | Manfred Bock | Process for the preparation of polyisocyanates containing isocyanurate groups and the use thereof |
EP0057653B1 (en) * | 1981-02-03 | 1985-04-17 | Rhone-Poulenc Specialites Chimiques | Process for obtaining compounds containing isocyanuric groups by catalytic cyclotrimerization of isocyanates by means of compounds having aminosilyl groups, isocyanurates obtained by elaborating the process |
DE3144672A1 (en) * | 1981-11-10 | 1983-05-26 | Bayer Ag, 5090 Leverkusen | METHOD FOR PRODUCING MIXED TRIMERISATES OF ORGANIC ISOCYANATES, THE MIXED TRIMERISATES OBTAINED BY THE METHOD, AND THE USE THEREOF FOR PRODUCING POLYURETHANES |
JPS58162581A (en) * | 1982-03-19 | 1983-09-27 | Nippon Polyurethan Kogyo Kk | Preparation of isocyanurate compound and useful composition of product produced thereby |
EP0155559A1 (en) * | 1984-02-29 | 1985-09-25 | Dainippon Ink And Chemicals, Inc. | Process for production of isocyanurate ring-containing polyisocyanate and resin composition for urethane paints comprising said polyisocyanate and acrylic polyol |
EP0175344B1 (en) * | 1984-09-18 | 1990-05-02 | Dainippon Ink And Chemicals, Inc. | Process for producing polyisocyanate and resin composition comprising said polyisocyanate for use in paints |
JPH0678418B2 (en) * | 1986-03-10 | 1994-10-05 | 大日本インキ化学工業株式会社 | Resin composition |
GB2203159B (en) * | 1987-04-03 | 1990-12-12 | Asahi Chemical Ind | An isocyanurate polyisocyanate and its use as a curing agent for a two-component polyurethane composition |
DE3806276A1 (en) * | 1988-02-27 | 1989-09-07 | Bayer Ag | METHOD FOR PRODUCING POLYISOCYANATES CONTAINING ISOCYANURATE GROUPS AND THE USE THEREOF |
DE3900053A1 (en) * | 1989-01-03 | 1990-07-12 | Bayer Ag | PROCESS FOR THE PREPARATION OF POLYISOCYANATES USING URETDION AND ISOCYANATE GROUPS, THE POLYISOCYANATES AVAILABLE FOR THIS PROCESS, AND THEIR USE IN TWO-COMPONENT POLYURETHANE VARNISHES |
DE3928503A1 (en) * | 1989-08-29 | 1991-03-07 | Bayer Ag | METHOD FOR PRODUCING SOLUTIONS OF POLYISOCYANATES CONTAINING ISOCYANURATE GROUPS IN LACQUER SOLVENTS AND THE USE THEREOF |
-
1991
- 1991-01-22 US US07/644,174 patent/US5124427A/en not_active Expired - Lifetime
-
1992
- 1992-01-09 ES ES92100234T patent/ES2093721T3/en not_active Expired - Lifetime
- 1992-01-09 EP EP92100234A patent/EP0496208B1/en not_active Expired - Lifetime
- 1992-01-09 DE DE69214848T patent/DE69214848T2/en not_active Expired - Lifetime
- 1992-01-14 CA CA002059338A patent/CA2059338C/en not_active Expired - Lifetime
- 1992-01-21 JP JP4029008A patent/JP2670934B2/en not_active Expired - Lifetime
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EP0496208B1 (en) | 1996-10-30 |
ES2093721T3 (en) | 1997-01-01 |
DE69214848D1 (en) | 1996-12-05 |
EP0496208A2 (en) | 1992-07-29 |
US5124427A (en) | 1992-06-23 |
EP0496208A3 (en) | 1993-03-10 |
JP2670934B2 (en) | 1997-10-29 |
JPH0570444A (en) | 1993-03-23 |
DE69214848T2 (en) | 1997-02-27 |
CA2059338A1 (en) | 1992-07-23 |
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