Patent ID: 8663901

Claim:
A fluorine-free photoacid generator, said photoacid generator comprising an onium cationic component 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 N; G 1 is not present in the structure when Y is N; each of G 2 -G 5 is selected from the group consisting of R and an electron withdrawing moiety, provided that and at at least one of G 2 -G 5 is an electron withdrawing moiety; and said onium cationic component is selected from the group consisting of sulfonium cations and iodonium cations.