Patent ID: 7323517

Claim:
A polymerizable composition, comprising a) at least one ethylenically unsaturated monomer or oligomer, b2) at least one stable free nitroxyl radical and a free radical initiator and c) a chain transfer agent selected from the group consisting of a mercaptane and a thioether, wherein the nitroxyl radical of component b2) is of formula A′, B′ or O′ wherein m is 1, R is hydrogen, C 1 -C 18 alkyl which is uninterrupted or interrupted by one or more oxygen atoms, cyanoethyl, benzoyl, glycidyl, a monovalent radical of an aliphatic carboxylic acid having 2 to 18 carbon atoms, of a cycloaliphatic carboxylic acid having 7 to 15 carbon atoms, or an α,β-unsaturated carboxylic acid having 3 to 5 carbon atoms or of an aromatic carboxylic acid having 7 to 15 carbon atoms; p is 1; R 1 is C 1 -C 12 alkyl, C 5 -C 7 cycloalkyl, C 7 -C 8 aralkyl, C 2 -C 18 alkanoyl, C 3 -C 5 alkenoyl or benzoyl; R 2 is C 1 -C 18 alkyl, C 5 -C 7 cycloalkyl, C 2 -C 8 alkenyl unsubstituted or substituted by a cyano, carbonyl or carbamide group, or is glycidyl, a group of the formula —CH 2 CH(OH)-Z or of the formula —CO-Z or —CONH-Z wherein Z is hydrogen, methyl or phenyl; G 6 is hydrogen and G 5 is hydrogen or C 1 -C 4 alkyl, and G 1 and G 3 are methyl and G 2 and G 4 are ethyl or propyl or G 1 and G 2 are methyl and G 3 and G 4 are ethyl or propyl.