Patent ID: 9688813
Date: 2017-06-27
CPC Classifications: C08G

Claim:
1. A method of forming a thermoplastic polyester elastomer, comprising: (a) reacting a parts by mole of a hard-segment diol, b parts by mole of a soft-segment diol, and 1 part by mole of a diacid to form a polyester, wherein 1≦a≦3 and 0.005≦b≦1.5; and (b) simultaneously reacting 100 parts by weight of the polyester and 0.01 to 2 parts by weight of an epoxy resin with two epoxy groups under vacuum at 230° C. to 260° C. to form a thermoplastic polyester elastomer, wherein the hard-segment diol is ethylene glycol, butylene glycol, or a combination thereof, and the soft-segment diol is polytetramethylene glycol with a number average molecular weight of 250 to 4000, wherein the thermoplastic polyester elastomer has a melting index from 0.7 to 17.03 for a standard weight of 2.16 kg at 230° C.