Patent ID: 9645491
Date: 2017-05-09
CPC Classifications: C07C,C07D,C08F,G03F,H01L

Claim:
1. A sulfonium salt having the formula (1): wherein R 11 is a straight, branched or cyclic C 1 -C 30 divalent hydrocarbon group which may contain a heteroatom, R 12 and R 13 are each independently a straight, branched or cyclic C 1 -C 20 monovalent hydrocarbon group which may contain a heteroatom, any two or more of R 11 , R 12 and R 13 may bond together to form a ring with the sulfur atom to which they are attached, L 1 is a carbonyl bond, sulfonyl bond or sulfinyl bond, L 2 is a single bond, ether bond, carbonyl bond, ester bond, amide bond, sulfide bond, sulfinyl bond, sulfonyl bond, sulfonic acid ester bond, sulfinamide bond, sulfonamide bond, carbamate bond or carbonate bond, A 1 is hydrogen, halogen or a straight, branched or cyclic C 1 -C 20 monovalent hydrocarbon group which may contain a heteroatom, x a and X b are each independently hydrogen, fluorine or trifluoromethyl, at least one of X a and X b is fluorine or trifluoromethyl, and k 1 is an integer of 1 to 4.