Patent ID: 8846779
Filing Date: 2014-09-30
Classification: C09D,Y10S

Abstract:
1. An energy ray-curable ink composition comprising a coloring agent, a polymerizable compound, a photopolymerization initiator and a surface conditioner, wherein the polymerizable compound consists only of a monofunctional monomer having an acrylic equivalent of 300 or less, and having one ethylenic double bond in one molecule, and a polyfunctional monomer having an acrylic equivalent of 150 or less, and having two or more ethylenic double bonds in one molecule, the photopolymerization initiator contains an α-aminoalkylphenone compound and a thioxanthone compound, the surface conditioner contains a silicone compound having a polydimethylsiloxane structure, the ink composition contains 10 to 20% by mass of the monofunctional monomer, 10 to 75% by mass of the polyfunctional monomer, 2 to 20% by mass of the α-aminoalkylphenone compound, 0.1 to 10% by mass of the thioxanthone compound, and 2.5% by mass or less of the silicone compound in the total amount of the ink composition, and a mass ratio of the content of the monofunctional monomer and the content of the polyfunctional monomer (polyfunctional monomer/monofunctional monomer) is 3 to 8.