Patent ID: 7244472

Claim:
An actinic radiation curable composition, comprising a photopolymerizable monomer and a photo-acid generating agent selected from the group consisting of compounds represented by Formulas (I)–(III): wherein R 1 –R 13 each represents a hydrogen atom or a substituent selected from the group consisting of an alkyl group, a halogenated alkyl group, an alkoxy group, a carbonyl group, a phenylthio group, a halogen atom, a cyano group, a nitro group and a hydroxy group, provided that R 1 –R 3 , R 4 –R 7 and R 8 –R 13 do not represent a hydrogen atom at the same time, S 1 –S 6 each represents a sulfur atom, each of S 1 –S 5 having three bonds each bond being to a different adjacent carbon atom, at least one of the bonds between S 1 and the adjacent C atom in Formula (I) having a bond distance in the range of 0.1688 nm–0.1750 nm and none having a bond distance greater than 0.1750 nm, at least one of the bonds between S 3 and the adjacent C atom in Formula (II) having a bond distance in the range of 0.1688 nm–0.1750 nm and none having a bond distance greater than 0.1750 nm, at least one of the bonds between S 4 and the adjacent C atom and at least one of the bonds between S 5 and the adjacent C atom in Formula (III), having a bond distance in the range of 0.1688 nm–0.1750 nm and none having a bond distance greater than 0.1750 nm, and X represents a non-nucleophilic anion group.