Patent ID: 8426499

Claim:
An offset printing ink in which a modified pigment (D) is dispersed in a vehicle as a colorant, the modified pigment (D) has a polymer (P) on the surface thereof, and the modified pigment (D) is obtained by mixing a pigment (A); at least one of a resin or fat (B) having a polymerizable unsaturated group, said resin or fat (B) is selected from the group consisting of acrylic resins having a polymerizable unsaturated group, alkyd resins, natural resin-modified phenol resins, and fats; and nonaqueous solvent; and adding, mixing, and polymerizing with at least one polymerizable unsaturated monomer (C) on the surface of the pigment (A); and wherein the polymerizable unsaturated monomer (C) contains a polyfunctional polymerizable monomer.