Patent ID: 6506852
Filing Date: 2003-01-14
Classification: C08G

Abstract:
A method for producing pellets of a high molecular weight polyester having swell of 60-200%, characterized by heating a mixture consisting of: (a) 100 parts by weight of a linear saturated polyester; (b) 0.3-5 parts by weight of a mixture, as a coupling agent, composed of (1) 0-75 percent by weight of a bifunctional epoxide ingredient containing 2 epoxide groups per molecule and (2) 100-25 percent by weight of a polyfunctional epoxide ingredient containing 3 or more epoxide groups per molecule; and (c) 0.01-5 parts by weight of metal salt of carboxylic acid as a catalyst for coupling reaction, at a temperature higher than a melting point of said polyester resin, pelletizing a resulting resin.