Patent ID: 7855266
Filing Date: 2010-12-21
Classification: C08F,C08G,C08L,C09D,C09J

Abstract:
1. A hydrophilic or hydrophobic self-crosslinking polyurethane (B) comprising on average per molecule at least one pendant olefinically unsaturated group or a mixture of at least one pendant olefinically unsaturated group with at least one terminal olefinically unsaturated group, and at least one pendant blocked isocyanate group, and which is the reaction product of: (1) a polyurethane prepolymer (B1) comprising on average per molecule at least one pendant olefinically unsaturated group or a mixture of at least one pendant olefinically unsaturated group with at least one terminal olefinically unsaturated group, at least one pendant blocked isocyanate group, and at least one free isocyanate group; and (2) at least one material selected from the group consisting of blocking agent (B1.7), compounds containing at least two isocyanate-reactive functional groups (B1.8), and mixtures thereof so that free isocyanate groups are no longer detectable; wherein the olefinically unsaturated groups are (meth)acrylate, ethacrylate, crotonate, cinnamate, vinyl ether, vinyl ester, dicyclopentadienyl, norbornenyl, isoprenyl, isopropenyl, allyl, butenyl, isoprenyl ether, isopropenyl ether, allyl ether, butenyl ether, isoprenyl ester, isopropenyl ester, allyl ester, butenyl ester, ethenylarylene of the general formula (I): in which —C 6 H 4 — is a 1,2-, 1,3- or 1,4-phenylene radical, or a combination comprising at least one of the foregoing olefinically unsaturated groups; and wherein the polyurethane prepolymer (B1) is prepared by reacting: (B1.1) at least one polyisocyanate; (B1.2) at least one polyol; (B1.3) at least one compound comprising at least one blocked isocyanate group and at least two isocyanate-reactive functional groups with the proviso that (B1.3) is not the reaction product of a trimethylolpropane; and (B1.4) at least one compound comprising at least one olefinically unsaturated group and at least two isocyanate-reactive functional groups; in at least one stage such that on average per molecule there remains at least one free isocyanate group.