Patent ID: 8309628

Claim:
An ink composition for heatset offset printing containing a pigment, a binder resin, a petroleum solvent, and at least one kind of vegetable oil component selected from the group consisting of a vegetable oil and a fatty acid ester of a vegetable oil, said vegetable oil component is present in an amount greater than 0 and up to and including 20% by mass, and said ink composition further containing: 0.008 to 0.7% by mass of a metal soap drier based on the mass of the metal contained in the drier; 0.008 to 12% by mass of at least one kind selected from the group consisting of a polyvalent carboxylic acid, a salt or ester of a polyvalent carboxylic acid, tocopherol, and tocotrienol; and 0.08 to 12% by mass of a phenolic antioxidant.