Patent ID: 8785105

Claim:
A polymer comprising recurring units having the general formulae (1a), (2), and (3): wherein R 1 is hydrogen, fluorine, methyl or trifluoromethyl, R 2 , R 3 , and R 4 are each independently a substituted or unsubstituted, straight or branched C 1 -C 10 alkyl, alkenyl or oxoalkyl group, a substituted or unsubstituted C 6 -C 18 aryl, aralkyl or aryloxoalkyl group, or 4-fluorophenyl group, any two of R 2 , R 3 , and R 4 may bond together to form a ring with the sulfur atom, with the proviso that at least one of R 2 , R 3 , and R 4 is a 4-fluorophenyl group, n is an integer of 0 to 2, R 8 is hydrogen or a C 1 -C 10 alkyl group, p is 0 or 1, B is a single bond or a C 1 -C 10 divalent organic group which may be substituted with an oxygen atom, a is an integer of 0 to 3, b is an integer of 1 to 3, and X is an acid labile group.