Patent ID: 7335782

Claim:
Photoinitiator compounds of formula (I): where: A represents a direct bond or a group of formula —[O(CHR 7 CHR 6 ) a ] y —, —[O(CH 2 ) b CO] y —, or —[O(CH 2 ) b CO] y-1 )—[O(CHR 7 CHR 6 ) a ]—, where: R 6 and R 7 are independently selected from hydrogen atoms and methyl groups, provided that both R 6 and R 7 do not represent methyl groups; a is a number from 1 to 2; b is a number from 4 to 5; Q is a residue of a polyol having from 2 to 6 hydroxy groups; 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; R 1 , R 2 , R 3 and R 4 are independently selected from hydrogen atoms, hydroxy groups, and C 1 -C 4 alkyl groups; or R 1 and R 3 are joined to form a fused ring system with the benzene rings to which they are attached; and R 5 represents a direct bond, an oxygen atom or a —CH 2 — group.