Patent ID: 7235663

Claim:
A polymerizable composition, comprising a) at least one ethylenically unsaturated monomer or oligomer, and b) a compound of formula Ia, IIa or IIIa wherein D is a group or a group C(O)—R 13 ; R 13 is phenyl or C 1 –C 18 alkyl; m is 1, 2 or 3; n is 1 or 2; if n is 1 Y and Y′ together form one of the bivalent groups —C(R 1 )(R 2 )—CH(R 3 )—, CH(R 1 )—CH 2 —C(R 2 )(R 3 )—, —CH(R 2 )—CH 2 —C(R 1 )(R 3 )—, —CH 2 —C(R 1 )(R 2 )—CH(R 3 )—, o-phenylene, 1,2-cyclohexyliden, —CH 2 —CH═CH—CH 2 — or wherein R 1 is hydrogen, C 1 –C 12 alkyl, COOH, COO—(C 1 –C 12 )alkyl or CH 2 OR 4 ; R 2 and R 3 are independently hydrogen, methyl ethyl, COOH or COO—(C 1 –C 12 )alkyl; R 4 is hydrogen, C 1 –C 12 alkyl, benzyl, or a monovalent acyl residue of an aliphatic, cycloaliphatic or aromatic monocarboxylic acid having up to 18 carbon atoms; if n is 2 Y and Y′ together form one of the tetravalent groups wherein Q is a bisacyl residue of a C 2 –C 12 dicarboxylic acid or C 1 –C 12 alkylene; Z is C 1 –C 12 alkylene; the R 12 are independently of each other H or CH 3 .