Patent ID: 8617789

Claim:
A photoacid generator represented by the following formula (1): wherein in the formula (1), Y 1 and Y 2 each independently represent any one selected from the group consisting of a cycloalkyl group, a heterocycloalkyl group, an aryl group and a heteroaryl group; X represents any one selected from the group consisting of an alkanediyl, an alkenediyl, NRâ€², S, O, CO and combinations thereof, while Râ€² represents any one selected from the group consisting of a hydrogen atom and an alkyl group; R 1 and R 2 each independently represent any one selected from the group consisting of a hydrogen atom, an alkyl group, an alkoxy group, a perfluoroalkyl group, a perfluoroalkoxy group, a halogen group, a hydroxyl group, a carboxyl group, a cyano group, a nitro group, an amino group and a thio group; n 1 represents an integer or 1 or 2; n 2 represents an integer from 0 to 5; and A + represents an organic counterion.