Patent ID: 7151130

Claim:
A polyurethane-modified addition copolymer prepared by free-radically (co)polymerizing at least one olefinically unsaturated monomer (a) in an aqueous or nonaqueous medium comprising the reaction product (A/B) of (A) at least one addition copolymer containing on avenge per molecule at least 0.1 isocyanate-reactive functional groups prepared by free-radical copolymerization in an aqueous medium or nonaqueous medium of at least a) at least one olefinically unsaturated monomer and b) at least one olefinically unsaturated monomer different than the olefinically unsaturated monomer (a) and of the general formula I R 1 R 2 C═CR 3 R 4 (I) in which the radicals R 1 , R 2 , R 3 , and R 4 each independently of one another are hydrogen atoms or alkyl, cycloalkyl, alkylcyoloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of the variables R 1 , R 2 , R 3 , and R 4 are aryl, arylalkyl or arylcycloalkyl radicals; and (B) at least one polyisocyanate.