Patent ID: 8039198

Claim:
A polymer comprising recurring units of a sulfonium salt having the general formula (1) in which the recurring units are at least one selected from general formulae (18) and (19): wherein R 1 is hydrogen, fluorine, methyl or trifluoromethyl, R 2 to R 4 are each independently straight, branched or cyclic C 1 -C 10 alkyl or alkoxy, R 5 is substituted or unsubstituted, straight, branched or cyclic C 1 -C 30 alkyl or substituted or unsubstituted C 6 -C 14 aryl, k, m and n are each independently an integer of 0 to 3, R 11 is straight, branched or cyclic C 1 -C 20 alkyl which may have fluorine atom, W is —CH 2 —, oxygen or sulfur atom, L 2 is straight or branched C 1 -C 5 alkylene, and p is 0 or 1.