Patent ID: 7973124
Filing Date: 2011-07-05
Classification: C08G

Abstract:
1. A thermoplastic polyester elastomer comprising a hard segment which consists of polyester constituted with aromatic dicarboxylic acid and aliphatic or alicyclic diol and a soft segment which consists of aliphatic polycarbonate, wherein the aliphatic polycarbonate is an aliphatic polycarbonate constituted with aliphatic diol residues having a carbon number of 2-12 and carbonate bonds or an aliphatic polycarbonate prepared by copolymerizing 40 parts by weight or lower of glycols selected from diol dimers, hydrogenated diol dimers and their modifications; dicarboxylic acids selected from dimer acids and hydrogenated dimer acids; polyesters or oligoesters constituted with aliphatic, aromatic, or alicyclic dicarboxylic acids and glycols; polyesters or oligoesters constituted with ε-caprolactone; polyalkylene glycols or oligoalkylene glycols selected from polytetramethylene glycol and polyoxyethylene glycol with respect to 100 parts by weight of the aliphatic polycarbonate segments, wherein hard segment-constituting units and soft segment-constituting units being directly connected with ester bonds or carbonate bonds, and wherein when melting points of the thermoplastic polyester elastomer are measured with a differential scanning calorimeter in three cycles wherein a temperature is raised from room temperature to 300° C. at a heating rate of 20° C./min., maintained at 300° C. for 3 minutes and lowered to room temperature at a cooling rate of 100° C./min., a melting point difference (Tm1−Tm3) between a melting point obtained in the first cycle (Tm1) and a melting point obtained in the third cycle (Tm3) is 0-50° C., and a tensile strength at break is 15-100 MPa.