Patent ID: 8101559

Claim:
A block copolymer obtainable by polymerizing at least one monomer composition which consists of a) from 0 to 40% by weight of at least one ethylenically unsaturated ester compound of the formula (I) in which R is hydrogen or methyl, R 1 is a linear or branched alkyl radical having from 1 to 5 carbon atoms, R 2 and R 3 are each independently hydrogen or a group of the formula —COOR′ in which R′ is hydrogen or an alkyl group having from 1 to 5 carbon atoms, b) from 10 to 99.9% by weight of at least one ethylenically unsaturated ester compound of the formula (II) in which R is hydrogen or methyl, R 4 is a linear or branched alkyl radical having from 6 to 15 carbon atoms, R 5 and R 6 are each independently hydrogen or a group of the formula —COOR″ in which R″ is hydrogen or an alkyl group having from 6 to 15 carbon atoms, c) from 0 to 80% by weight of at least one ethylenically unsaturated ester compound of the formula (III) in which R is hydrogen or methyl, R 7 is a linear or branched alkyl radical having from 16 to 30 carbon atoms, R 8 and R 9 are each independently hydrogen or a group of the formula —COOR″′ in which R″′ is hydrogen or an alkyl group having from 16 to 30 carbon atoms, d) from 0.1 to 30% by weight of at least one ethylenically unsaturated, polar ester compound of the formula (IV) in which R is hydrogen or methyl, X is oxygen, sulfur or an amino group of the formula —NH— or —NR a — in which R a is an alkyl radical having from 1 to 40 carbon atoms, R 10 is a radical which comprises from 2 to 1000 carbon atoms and has at least 2 heteroatoms, R 11 and R 12 are each independently hydrogen or a group of the formula —COX′R 10 ′ in which X′ is oxygen or an amino group of the formula —NH— or —NR a′ — in which R a′ is an alkyl radical having from 1 to 40 carbon atoms, and R 10′ is a radical comprising from 1 to 100 carbon atoms, e) from 0 to 50% by weight of comonomer, based in each case on the total weight of the ethylenically unsaturated monomers; wherein said compound of the formula (IV) comprises at least one group of the formula —CO— which is a carbonyl group of a ketone, an aldehyde, a urea group containing (meth)acrylate or mixtures thereof.