Patent ID: 8361563

Claim:
An ink composition comprising: (A) an isoindoline-based pigment; (B) a pigment dispersing agent; (C) a radically polymerizable compound; and (D) a polymerization initiator; the radically polymerizable compound (C) comprising a difunctional urethane (meth)acrylate oligomer and at least one compound selected from the group consisting of compounds represented by Formula (I) to Formula (III): and a difunctional urethane (meth)acrylate oligomer: wherein R 1 denotes a hydrogen atom or a methyl group, A 1 denotes a single bond or a divalent linking group, R 2 denotes a monovalent substituent, m denotes an integer of 0 to 13, and when m is an integer of 2 to 13, the R 2 s may be identical to or different from each other, R 3 denotes a hydrogen atom or a methyl group, A 2 denotes a single bond or a divalent linking group, and n denotes an integer of 1 to 5.