ENERGY RAY-CURABLE INK COMPOSITION

摘要

Disclosed is an energy ray-curable ink composition containing a coloring agent, a monomer and a photopolymerization initiator. As the monomer, 10-90% by weight of an acrylamide derivative is contained 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. This ink composition has low viscosity without being diluted with a diluent, while exhibiting good storage stability and good pigment dispersibility in cases where the coloring agent is composed of a pigment. The ink composition further has excellent stability in continuous discharge to a recording medium, and exhibits good curability even when the energy is low and the integrated amount of light is not more than 150 mJ/cm². Furthermore, the ink composition enables to obtain good print quality on a non-absorptive recording medium, and in particular, it exhibits excellent adhesion to a recording medium base.