Patent ID: 7799505

Claim:
A photosensitive composition comprising: a non-polymeric arylsulfonium salt compound having a polycyclic hydrocarbon structure in a cation moiety, represented by the following formula (I): wherein X 1 and X 2 each independently represents an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group, and X 1 and X 2 may combine to form a ring structure, Ar 1 represents an aryl group, Y 1 represents a single bond or a divalent linking group which is selected from the group consisting of an alkylene group, an arylene group, —O—, —S—, —SO 2 —, —SO 3 —, —C(═O)NRd-, —SO 2 NRd-, and a divalent linking group comprising a plurality of these in combination, wherein Rd represents a hydrogen atom or an alkyl group, Y 2 represents a polycyclic hydrocarbon group, m 1 represents a number of from 0 to 2, m 2 represents a number of from 0 to 2, m 3 represents a number of from 1 to 3, provided that m 1 +m 2 +m 3 =3, m 4 represents a number of from 1 to 3, and X − represents a counter anion.