Patent ID: 6803442
Filing Date: 2004-10-12
Classification: B29B,C08J,Y02P,Y02W

Abstract:
A masterbatch method for producing a polyester resin, comprising the step of allowing materials to react uniformly at a temperature equal to or greater than the melting point of a polyester A, the materials comprising:(1) 100 parts by weight of saturated straight-chain polyester A; (2) 1 to 10 parts by weight of binder masterbatch D comprising: 10 to 5 parts by weight of a mixture acting as a binder containing 0 to 100 parts by weight of a compound having two epoxy groups in the molecule thereof and 100 to 0 parts by weight of a compound having an average number of epoxy groups of 2.1 or more; and 100 parts by weight of base substance C; and (3) 0.25 to 10 parts by weight of catalyst masterbatch G comprising: 5 to 25 parts by weight of a metal carboxylate acting as coupling reaction catalyst E; and 100 parts by weight of base substance F, whereby the melt viscosity of the polyester increases so that the melt flow rate (MFR) is 50 g/10 min or less at 280Â° C. and under a load of 2.16 kgf in accordance with condition 20 of JIS K 7210, and the degree of swelling of the polyester increases to between 5% and 200%.