Patent ID: 7977430

Claim:
A crosslinkable polyurea prepolymer, which is a reaction product of an amine- or isocyanate-capped polyurea and a multifunctional compound having at least one ethylenically unsaturated group and a function group coreactive with the capped amine or isocyanate groups of the amine- or isocyanate-capped polyurea, wherein the amine- or isocyanate-capped polyurea is a copolymerization product of a mixture comprising the components of: (a) at least one aminoalkyl polyalkylene glycol of formula (1) CG—(R 1 —O) p —(R 2 —O) m —(R 3 —O) p —CG′ (1) wherein CG and CG′ independently of each other are a primary or secondary amino group, or an amino-C 1 -C 12 alkyl, R 1 , R 2 , and R 3 , independently of one other, are each linear or branched C 2 -C 4 -alkylene or hydroxy-substituted C 2 -C 8 alkylene radical, and n, m and p, independently of one another, are each a number from 0 to 500, wherein the sum of (n+m+p) is 5 to 1000, (b) optionally at least one organic di- or poly-amine, wherein the organic diamine is a linear or branched C 2 -C 24 aliphatic diamine, a C 5 -C 24 cycloaliphatic or aliphatic-cycloaliphatic diamine, or a C 6 -C 24 aromatic or araliphatic diamine, and wherein the organic poly amine is a compound of formula wherein R 4 and R 4 ′ independently of each other are hydrogen or unsubstituted or substituted C 1 -C 6 alkyl or together are a direct, ring-forming bond, and B 1 ′ is a bivalent radical selected from the group consisting of a linear or branched C 3 -C 24 alkylene, an unsubstituted C 6 -C 10 arylene, a C 1 -C 4 alkyl-substituted C 6 -C 10 arylene, a C 7 -C 18 aralkylene, C 6 -C 10 arylene-C 1 -C 2 alkylene-C 8 -C 10 arylene, C 3 -C 8 cycloalkylene, C 3 -C 8 cycloalkylene-C 1 -C 6 alkylene, C 3 -C 8 cycloalkylene-C 1 -C 2 alkylene-C 3 -C 8 cycloalkylene or C 1 -C 6 alkylene-C 3 -C 8 cycloalkylene-C 1 -C 6 alkylene, each of which is interrupted by at least one groups of —NH— or has at least one primary or secondary amine group, (c) optionally at least one diisocyanate selected from the group consisting of a linear C 3 -C 24 aliphatic diisocyanate, a branched C 3 -C 24 aliphatic diisocyanate, a C 5 -C 24 cycloaliphatic diisocyanate, a C 5 -C 24 aliphatic-cycloaliphatic diisocyanate, a C 8 -C 24 aromatic diisocyante, a C 6 -C 24 araliphatic diisocyanate, and mixtures thereof, and (d) at least one polyisocyanate having at least three isocyanate groups, wherein the polyisocyanate is selected from the group consisting of a linear or branched C 3 -C 24 aliphatic polyisocyanate, a C 6 -C 45 cycloaliphatic or aliphatic-cycloaliphatic compound containing 3-6 isocyanate groups and at least one heteroatom selected from the group consisting of oxygen and nitrogen, a C 6 -C 24 aromatic or araliphatic polyisocyanate, an isocyanurate polyisocyanate, and mixtures thereof, wherein the crosslinkable polyurea prepolymer is able to form a hydrogel.