Patent ID: 7732504

Claim:
Photoinitiators of the formula I wherein n is 1 or 2; L is linear or branched C 2 -C 18 -alkanediyl; X is —O—; Z is a direct bond; R 1 is (a) linear or branched unsubstituted C 1 -C 12 -alkyl; (b) a radical of the formula; (d) a radical of the formula wherein Ar is phenyl, which is unsubstituted or substituted by one or more of the groups —N(R 10 ) 2 , C 1 -C 4 -alkyl or C 1 -C 4 -alkoxy; R 2 if n is 1, independently of R 1 has one of the meanings of R 1 ; R 2 if n is 2, is C 2 -C 8 alkylene; R 3 is C 1 -C 4 -alkyl or C 2 -C 4 -alkyl substituted by hydroxy; R 4 independently of R 3 has one of the meanings of R 3 ; or R 4 together with R 3 is C 4 -C 5 -alkylene that may be interrupted by —O—, —N(R 13 )—; R 5 is hydrogen or C 1 -C 4 -alkyl; R 6 , R 7 , R 8 and R 9 independently of each other are hydrogen or methyl; R 10 is hydrogen, C 1 -C 4 -alkyl or C 3 -C 5 -alkenyl; R 13 is hydrogen or C 1 -C 4 -alkyl; R 30 is hydrogen R 31 is hydrogen or C 2 -C 6 -alkyl substituted by hydroxy; with the proviso that the following compounds are excluded: