Patent ID: 6846540

Claim:
An optically active polyesteramide comprising at least a structural unit represented by the following general formula (I) and a structural unit represented by the following general formula (II): wherein in the general formula (I), R 1 and R 8 independently represent a hydrogen atom, an alkyl group, or an aryl group; R 2 to R 5 and R 9 to R 12 independently represent a hydrogen atom, a halogen atom, an alkyl group, or an alkoxy group; R 1 and R 2 as well as R 8 and R 9 may form a 5- or 6-membered ring; R 6 and R 7 as well as R 13 and R 14 independently represent a hydrogen atom or an alkyl group; Ar 1 and Ar 2 independently represent a single bond, 1,4-phenylene, naphthalene-2,6-diyl, or 1,4-phenylene or naphthalene-2,6-diyl substituted by at least one halogen atom, alkyl group or alkoxy group, and wherein in the general formula (II), A represents a divalent substituent.