Patent ID: 7244473

Claim:
An active ray curable ink-jet ink composition comprising: a photo-induced acid generating agent containing an onium salt which does not generate benzene during active ray radiation, and a photopolymerizable compound containing a compound having an oxetane ring in the molecule, wherein the onium salt is a sulfonium salt represented by one of Formulas (1) to (4): wherein R 1 –R 17 are individually selected from the group consisting of a hydrogen atom; an alkyl group selected from the group consisting of a methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, t-butyl group, pentyl group, and hexyl group; an alkoxy group selected from the group consisting of a methoxy group, ethoxy group, propoxy group, butoxy group, hexyloxy group, decyloxy group, and dodecyloxy group; a carbonyl group selected from the group consisting of a acetoxy group, propionyloxy group, decylcarbonyloxy group, dodecylcarbonyloxy group, methoxycarbonyl group, ethoxycarbonyl group, and benzoyloxy group: a halogen atom selected from the group consisting of fluorine, chlorine, bromine and iodine; a cyano group, a nitro group, or a hydroxyl group provided that R 1 –R 3 are not a hydrogen atom at the same time, at least one of R 1 –R 3 is an alkoxy group or all are each a methyl, R 4 –R 7 are not a hydrogen atom at the time, R 8 –R 11 are not a hydrogen atom the same time, R 12 –R 17 are not a hydrogen atom at the same time; X is a non-nucleophillic anion residue; and R 1 –R 3 of Formula (1) are not a phenylthio group or a phenoxy group.