Heat-curable coating compositions
First Claim
1. A heat-curable coating composition comprisingA) a prepolymer which has an average of 2-4 ketoxime-blocked NCO groups and an average molecular weight of 500-15,000 and which is prepared fromi) an aliphatic, cycloaliphatic or aromatic polyisocyanate andii) a polyhydroxy component having an average ethylene oxide content of 0 to 30% by weight and comprising at least one polyhydroxy compound containing a stable dispersion of a member selected from the group consisting of polyurethanes, polyurethane-ureas and polyureas, which are substantially free from NCO groups, hydroxyl groups and amino groups and which are based on the reaction product ofa) a diisocyanate having aromatically-, aliphatically- and/or cycloaliphatically-bound isocyanate groups andb) a compound selected from the group consisting of diamines, hydrazine, diols and mixtures thereof, wherein at least one of these compounds contains a hydrophillic group andiii) a ketoxime blocking agent, andB) a crosslinking agent of the formula ##STR3## wherein R and R1 represent H or C1 -C4 -alkyl group, the equivalent ratio of blocked NCO groups in A) to NH2 groups in B) being 1.35:
- 1 to 0.95;
1.
1 Assignment
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Accused Products
Abstract
The present invention relates to heat-curable coating compositions containing
A) a prepolymer having an average of 2-4 ketoxime-blocked NCO groups, having an average moleculer weight of 500-15,000 and prepared from aliphatic, cycloaliphatic and aromatic polyisocyanates and one or more polyhydroxy components which contain 0 to 30% by weight of ethylene oxide units and
B) a crosslinking agent of the formula ##STR1## wherein R and R1 represent H or C1 -C4 -alkyl, the ratio of equivalents of blocked NCO groups in A) to NH2 groups in B) being 1.35:1 to 0.95:1, characterized in that at least one of the polyhydroxy compounds used for the preparation of the prepolymer contains, in stable dispersion, a polyurethane, a polyurethane-urea and/or a polyurea, which is substantially free from NCO groups, hydroxyl groups and amino groups and which are synthesized from aromatic, aliphatic and/or cycloaliphatic diisocyanates and from diamines, hydrazine and/or diols, provided that at least one of these components carries a radical having hydrophilic characteristics.
The present invention also relates to the use of these coating compositions in a process for the coating, particularly water vapor-permeable coating, of substrates, preferably textile sheet-like structures and leather.
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Citations
10 Claims
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1. A heat-curable coating composition comprising
A) a prepolymer which has an average of 2-4 ketoxime-blocked NCO groups and an average molecular weight of 500-15,000 and which is prepared from i) an aliphatic, cycloaliphatic or aromatic polyisocyanate and ii) a polyhydroxy component having an average ethylene oxide content of 0 to 30% by weight and comprising at least one polyhydroxy compound containing a stable dispersion of a member selected from the group consisting of polyurethanes, polyurethane-ureas and polyureas, which are substantially free from NCO groups, hydroxyl groups and amino groups and which are based on the reaction product of a) a diisocyanate having aromatically-, aliphatically- and/or cycloaliphatically-bound isocyanate groups and b) a compound selected from the group consisting of diamines, hydrazine, diols and mixtures thereof, wherein at least one of these compounds contains a hydrophillic group and iii) a ketoxime blocking agent, and B) a crosslinking agent of the formula ##STR3## wherein R and R1 represent H or C1 -C4 -alkyl group, the equivalent ratio of blocked NCO groups in A) to NH2 groups in B) being 1.35: - 1 to 0.95;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- 1 to 0.95;
Specification