Patent ID: 8883395

Claim:
A fluorine-free photoacid generator, said photoacid generator comprising: an onium cationic component, wherein said onium cationic component is selected from the group consisting of sulfonium cations and iodonium cations; and an anionic component of formula (I): wherein X is NR; R is selected from the group consisting of H; linear, branched, tertiary, or cyclic alkyl; linear, branched, tertiary or cyclic alkoxyl; unsubstituted and substituted aromatic groups; and unsubstituted and substituted heteroaromatic groups; Y is C; and each of G 1 -G 5 is selected from the group consisting of R and an electron withdrawing moiety, provided that at least one of G 1 -G 5 is an electron withdrawing moiety selected from the group consisting of CN, NO, NO 2 , Cl, Br, I, SO 2 Me, and CHO.