Patent ID: 7964248

Claim:
Photoinitiator composition comprising a) at least one cationic photoinitiator (A) selected from the group consisting of sulfonium salts wherein the anion is a fluorophosphate defined by the following formula (I): PF n R x 6-n ⊖ (I) with n=an integer from 1 to 6 and R x =substituted or unsubstituted C 1-6 -alkyl or substituted or unsubstituted aryl or heteroaryl; and b) at least one cationic photoinitiator (B) which is different from (A) and is selected from at least one onium salt having a structure according to the following formula (VII) [R 1 a R 2 b R c 3 R 4 d E] + [MX n+1 ] − (VII) wherein E represents S, P, O, I or N≡N, R 1 , R 2 , R 3 and R 4 represent individually the same or different organic group selected from substituted or unsubstituted C 6-18 aryl; a, b, c, and d independently represent an integer from 0 to 3, and provided that a+b+c+d is 3 if E=S, 4 if E=P, 3 if E=O, 2 if E=I and 1 if E=N≡N; M represents a metal or metalloid selected from the group consisting of B, P, As Sb, Fe, Sn, Bi, Al; X represents F, Cl, Br, a substituted or unsubstituted aryl or heteroaryl group or mixtures thereof and; n is the valence number of M with the proviso that the onium salt is not a sulfonium salt wherein the anion is a fluorophosphate defined by the following formula (I): PF n R x 6-n ⊖ (I) with n=1 to 6 and R x =substituted or unsubstituted C 1-6 -alkyl or substituted or unsubstituted aryl or heteroaryl and characterised in that the weight ratio of (A) to (B) is higher than 0.1.