Patent ID: 8227624

Claim:
An aromatic sulfonium salt compound represented by the General Formula (I) below: (wherein each of E 1 to E 4 independently represents a substituent represented by the General Formula (II) below or the General Formula (III) below: (wherein each of R 1 to R 4 independently represents hydroxyl, mercapto, a halogen atom, nitro, cyano, C 1 -C 18 alkyl, C 6 -C 20 aryl, C 7 -C 20 arylalkyl, —OSiR 21 R 22 R 23 or —OP(═O)R 24 R 25 , wherein each of R 21 to R 25 independently represents C 1 -C 18 alkyl, C 6 -C 20 aryl or C 7 -C 20 arylalkyl, wherein methylene groups in the above-described alkyl and arylalkyl are optionally interrupted by —O—, —CO—, —COO—, —OCO—, —OCOO—, —S—, —SO—, —SO 2 — or —SO 3 —, and each hydrogen atom in said alkyl, aryl and arylalkyl is optionally substituted with a halogen atom; each of a and b represents an integer of 0 to 5 and each of c and d represents an integer of 0 to 4, with the proviso that in cases where each of a to d represents a number of not less than 2, its plurality of substituents represented by R 1 to R 4 are optionally the same or different; and X represents a direct bond, an oxygen atom, a sulfur atom, CR 9 R 10 , NR 11 or carbonyl; each of R 9 to R 11 represents a hydrogen atom, C 1 -C 18 alkyl, C 6 -C 20 aryl or C 7 -C 20 arylalkyl); each of m, n, r and s independently represents 0 or 1 with the proviso that at least one of m and s is 1; each of R 5 to R 8 independently represents the same group as R 1 to R 4 ; An q− represents an anion having the valence of q (q represents 1 or 2); and p represents 1 or 2 which is a coefficient to maintain the neutrality of the charge).