Patent ID: 8691490

Claim:
A sulfonium salt represented by the following general formula (2), wherein, W 1 represents a single bond or a divalent hydrocarbon group having 1 to 30 carbon atoms optionally containing a hetero atom; W 2 represents a single bond or a divalent hydrocarbon group having 1 to 33 carbon atoms optionally containing a hetero atom; A 1 represents a single bond, an ether bond or an ester bond; each R 11 , R 21 and R 31 independently represents a linear, a branched, or a cyclic alkyl group or alkoxy group having 1 to 10 carbon atoms; R 21 and R 31 may be bonded with each other to form a ring together with a sulfur atom in the formula; each R 4 and R 5 independently represents a hydrogen atom, a fluorine atom, a methyl group or a trifluoromethyl group; k represents 0 to 4; each m and n independently represents 0 to 5; and each p and q independently represents 0 or 1.