Ink for a printing ink binder resin

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PROBLEM TO BE SOLVED : To provide a heat resistant printing ink which does not cause printing failure on insert molding at high temperatures even if contaminated with a fingerprint sebum dirt, a hand cream, and the like; and a binder resin for ink used in the same.SOLUTION : A printing ink is contained in a binder resin for ink which has a content of a structural unit represented by a formula (1) of 20-70 mol% with respect to the total structural units constituting a polycarbonate resin. In the formula (1), Rto Rare each independently H, a substituted/unsubstituted 1-9C alkyl group, a 6-12C aryl group, a 1-5C alkoxy group, a 2-5C alkenyl group, or a 7-17C aralkyl group.SELECTED DRAWING : None