Patent ID: 7166647

Claim:
Photoinitiator compounds of formula (I): where: n is a number from 1 to 6 R 3 represents a hydrogen atom, a methyl group or an ethyl group, and, when n is greater than 1, the groups or atoms represented by R 3 may be the same as or different from each other; A represents a group of formula —[O(CHR 2 CHR 1 ) a ] y —, —[O(CH 2 ) b CO] y —, or —[O(CH 2 ) b CO] (y−1) —[O(CHR 2 CHR 1 ) a ]—, where: one of R 1 and R 2 represents a hydrogen atom and the other represents a hydrogen atom, a methyl group or an ethyl group; a is a number from 1 to 2; b is a number from 4 to 5; Q is a residue of a polyhydroxy compound having 2 to 6 hydroxy groups; and X is a number greater than 1 but no greater than the number of available hydroxyl groups in Q; when x is a number greater than 1 but no greater than 2, y is a number from 1 to 10; or when x is a number greater than 2, y is a number from 3 to 10; and esters thereof.