Patent ID: 6921622

Claim:
A photoresist composition comprising: (i) a photoresist polymer comprising a repeating unit selected from the group consisting of Formulas 2 and 3: wherein R 1 is selected from the group consisting of H, halogen, (C 1 -C 20 ) alkyl, (C 1 -C 20 ) alkyl with halogen substituent(s), (C 1 -C 20 ) alkyl containing an ether group (—O—), (C 1 -C 20 ) alkyl with halogen substituent(s) and containing an ether group, and —COOR′; R 2 , R 3 , R 5 and R 6 are individually selected from the group consisting of H, halogen, (C 1 -C 20 ) alkyl, (C 1 -C 20 ) alkyl with halogen substituent(s), (C 1 -C 20 ) alkyl containing an ether group, and (C 1 -C 20 ) alkyl with halogen substituent(s) and containing an ether group; R′, R 4 and R 7 are individually acid labile protecting groups; X and Y are individually selected from the group consisting of (C 1 -C 10 ) alkylene, O and S; n is 0 or 1; and the ratio a:b:c falls within the ranges 1-50 mol %: 0-50 mol %: 0-80 mol %, wherein at least one of b and c must be present; (ii) an organic solvent; and (iii) a photoacid generator.