Patent ID: 8318881

Claim:
A copolymer obtained by polymerizing monomers (A), (B) and (C), wherein (A) is a monomer of formula (I) wherein A is C 2 - to C 4 -alkylene, B is a C 2 - to C 4 -alkylene other than A, R is hydrogen or methyl, m is from 1 to 500; n is from 1 to 500, and the sum total of m+n is from 2 to 1000; wherein the monomer (B) is a compound of formula (IIa) or (IIb): wherein X a is an aromatic or araliphatic radical having 3 to 30 carbon atoms, optionally containing one or more of the hetero atoms N, O or S, Z a is H or (C 1 -C 4 )-alkyl, Z b is H or (C 1 -C 4 )-alkyl, and Z c is H or (C 1 -C 4 )-alkyl; wherein R 1 is hydrogen or methyl, X b is an aromatic or araliphatic radical having 3 to 30 carbon atoms, optionally containing one or more of the hetero atoms N, O or S, W a is oxygen or an NH group; and wherein the monomer (C) is a compound of formula (III): wherein R 2 is hydrogen or methyl, Y is an aliphatic hydrocarbyl radical having 1 to 30 carbon atoms, which is linear or branched or cyclic, and optionally contains hetero atoms O, N, S or a combination thereof and may also be unsaturated, W b is oxygen or an NH group.