Patent ID: 7868054

Claim:
A photopolymerizable system comprising at least one phenyl glyoxalic ester photoinitiator having the general formula I: wherein: A is selected from the group consisting of O, S, NR 3 , a linear or branched C 1 -C 6 alkyl or cycloalkyl and R 3 is hydrogen or a C 1 -C 6 linear or branched alkyl; and R 1 and R 2 are, independently of one another, selected from the group consisting of: a linear or branched C 1 -C 18 alkyl or cycloalkyl, (CH 2 CH 2 O) n R 4 where n is a integer from 1 to 6 and R 4 is hydrogen or a linear or a branched C 1 -C 4 alkyl, and CH 2 CH 2 N(R 5 ) 2 where R 5 is a linear or branched C 1 -C 4 alkyl.