Patent ID: 6891008

Claim:
A polymerizable composition comprising a) at least one ethylenically unsaturated monomer or oligomer and b) an initiator compound of formula Ia or IIa wherein Y is selected from the group consisting of R 1 is hydrogen, —COOH, —COO(C 1 -C 4 alkyl), —COO-phenyl, —COObenzyl, C 1 -C 8 alkoxy, C 1 -C 18 alkyl, C 2 -C 4 alkenyl, C 1 -C 18 alkyl or C 2 -C 4 alkenyl substituted by OH, —COOH, —COO(C 1 -C 4 alkyl, C 2 -C 18 alkyl which may be interrupted by one or more oxygen atom, unsubstituted cyclopentyl, cyclohexyl, cyclohexenyl, phenyl or naphthyl; or cyclopentyl, cyclohexyl, cylohexenyl, phenyl or naphthyl which are substituted by C 1 -C 4 alkyl, —COOH or —COO—(C 1 -C 4 alkyl); R 2 is hydrogen, C 1 -C 18 alkyl or R 1 and R 2 together with the nitrogen atom form a 5-membered ring which may have an unsaturated bond or be fused to a benzene ring; R 3 is hydrogen or C 1 -C 18 alkyl; and X is selected from the group consisting of —(C 5 -C 12 )-3-cycloalkenyl, —CH 2 -phenyl, CH 3 CH-phenyl, (CH 3 ) 2 C-phenyl, (C 5 -C 6 cycloalkyl) 2 CCN, (CH 3 ) 2 CCN, —CH 2 CH═CH 2 , CH 3 CH—CH═CH 2 , (C 1 -C 4 alkyl)CR 20 —C(O)-phenyl, (C 1 -C 4 )alkyl-CR 20 —C(O)—(C 1 -C 4 )alkoxy, (C 1 -C 4 )alkyl-CR 20 —C(O)—(C 1 -C 4 )alkyl, (C 1 -C 4 )alkyl-CR 20 —C(O)—N-di(C 1 -C 4 )alkyl, (C 1 -C 4 )alkyl-CR 20 —C(O)—NH(C 1 -C 4 )alkyl, (C 1 -C 4 )alkyl-CR 20 —C(O)—NH 2 , wherein R 20 is hydrogen or (C 1 -C 4 )alkyl; with the proviso that benzoic acid 2,6-diethyl-2,3,6-trimethyl-1-(1-phenyl-ethoxy)-piperidin-4-yl ester and 1-(1-phenylethoxy)-2,2-dimethyl-6,6-diethyl-4-benzoyloxypiperidine are excluded.