ENERGY RAY-CURABLE INK COMPOSITION

PROBLEM TO BE SOLVED: To provide an energy ray-curable ink composition which is low in viscosity without being diluted with a diluent, good in storage stability and pigment dispersibility in case where the coloring material is a pigment, excellent in continuous discharging stability to a recording medium, exhibiting good curability even with a low energy of integrated light quantity of 150 mJ/cm2or lower, obtainable good print quality even onto a non-absorptive recording medium, in particular, superior in adhesion to a recording medium base. SOLUTION: The energy ray-curable ink composition comprising a coloring material, a monomer and a photopolymerization initiator, comprises an acrylamide derivative and a three or more functional multifunctional acrylate monomer as the monomer, and is characterized in that the amount of the acrylamide derivative is 10-90 wt.% relative to the total weight of the ink composition, the amount of the multifunctional acrylate monomer is 10-50 wt.% relative to the total weight of the ink composition, and the viscosity of the ink composition as a whole is 3-35 mPa s at 25°C. COPYRIGHT: (C)2008,JPO&INPIT