Patent ID: 8552138

Claim:
A polyester resin (C) which is obtained by reacting an aliphatic polyester resin (A) and a polyisocyanate compound (B) in the presence of an amidation catalyst and comprises a structural unit represented by Formula (1) below and in a major proportion a structural unit represented by at least one selected from Formulae (3) and (4) below: wherein R is a C1-20 aliphatic hydrocarbon group, an alicyclic structure-containing hydrocarbon group or an aromatic ring-containing hydrocarbon group; wherein R 1 each independently represent a substituted or unsubstituted C1-20 aliphatic hydrocarbon group, R 2 represents a substituted or unsubstituted C1-20 aliphatic hydrocarbon group, a C2-20 unsaturated hydrocarbon group or an aromatic hydrocarbon group, and n is an integer ranging from 20 to 1500; wherein R 1 each independently represent a substituted or unsubstituted C1-20 aliphatic hydrocarbon group, R 2 represents a substituted or unsubstituted C1-20 aliphatic hydrocarbon group, a C2-20 unsaturated hydrocarbon group or an aromatic hydrocarbon group, and n and m are each independently an integer ranging from 20 to 1500.