Patent ID: 7932300

Claim:
An energy beam curable ink jet printing ink comprising (A) a colorant, (B) a compound having at least one ethylenically unsaturated bond which can be polymerized by the application of an energy beam and (C) a photopolymerization initiator, wherein the component (B) comprises (b1) a compound wherein the only unsaturated polymerizable group is a methacryloyl group wherein said compound may have one or more methacryloyl group, (b2) a compound wherein the only unsaturated polymerizable group is a acryloyl group wherein said compound may have one or more acryloyl group, and (b3) a compound having at least one vinyl group as a polymerizable unsaturated group, wherein the compound of component (b3) is not the same as the compound of component (b1) or component (b2), and wherein the component (C) is a compound represented by the following formula (1): wherein R 1 is a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms, R 2 and R 3 are each independently a hydrogen atom; a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms; or a benzyl group, R 4 , R 5 , R 7 and R 8 are each independently a hydrogen atom; a halogen atom; a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms; or a linear or branched alkoxy group having 1 to 4 carbon atoms, and R 6 is a halogen atom; a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms; a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms substituted by a substituent selected from the group consisting of a hydroxyl group and a linear or branched alkoxyl group having 1 to 4 carbon atoms; a linear or branched alkoxyl group having 1 to 4 carbon atoms; or a linear or branched alkoxyl group having 2 to 4 carbon atoms substituted by a substituent selected from the group consisting of a hydroxyl group and a linear or branched alkoxyl group having 1 to 4 carbon atoms.