Patent ID: 8034533

Claim:
A fluorine-free photoacid generator, said photoacid generator comprising an onium cationic component and an anionic component having the structure: wherein: X is S, R is selected from the group consisting of H; linear, branched, tertiary, or cyclic alkyl; linear, branched, tertiary or cyclic alkoxyl; unsubstituted and substituted phenyl; unsubstituted and substituted naphthyl; or unsubstituted and substituted fluorenyl; Y is C; each of G 1 -G 3 is selected from the group consisting of R and an electron withdrawing moiety, and at least one of G 1 -G 3 is an electron withdrawing moiety selected from the group consisting of CN, NO, NO 2 , Cl, Br, I, SO 2 Me and CHO.