Patent ID: 7354957

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 â€”[O(CHR 2 CHR 1 ) a ] y â€”, â€”[O(CH 2 ) b CO] y â€”, or â€”[O(CH 2 ) b CO] y-l )â€”[Oâ€”(CHR 2 CHR 1 ) a ]â€”, 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 ethylene glycol, propylene glycol, butylene glycol, glycerol, trimethylolpropane, di-trimethylolpropane, pentaerythritol or di-pentaerythritol; x is a number greater than 1 but no greater than the number of available hydroxyl groups in Q; and 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 in which a free hydroxyl group in Q has been esterified.