Polyester resin, active energy ray-curable ink composition containing same, and method for producing same

Abstract

To provide a resin for ink compositions that is usable in the preparation of active energy ray-curable ink compositions and that can increase a proportion of biomass-derived ingredients. A polyester resin that is a condensation polymer of an acid ingredient including a fatty acid containing an epoxy group and a polybasic acid, and a polyhydric alcohol is employed, wherein the fatty acid has a peroxide value of 1 meq/kg or more in terms of triglyceride. Such a resin is prepared by a process for producing the polyester resin through heating a mixture containing an epoxidized oil or fat, a polybasic acid, and a polyhydric alcohol to subject to a transesterification reaction and a polycondensation reaction, wherein the epoxidized oil or fat has a peroxide value of 1 meq/kg or more.

Dependencies are inferred from the claim text.