Patent Number: 6,200,659

Title: Polyester, stretch blow molded product formed thereof and method for producing polyester

Abstract: Disclosed are a polyester mainly composed of an aromatic dicarboxylic acid as an acid component and an aliphatic diol as a diol component, wherein the content of an antimony element in the polyester is from 50 to 350 ppm, the number of metallic antimony particles having a diameter of 0.5 .mu.m or more is 30,000 or more per 100 mg of polyester, the ratio of the number of fine particles having a diameter of 0.5 .mu.m to less than 0.6 .mu.m is 70% or more, and the L value in hue is 80 or more; a stretch blow molded product formed of the polyester; and a method for producing a polyester mainly composed of an aromatic dicarboxylic acid as an acid component and ethylene glycol as a diol component which comprises adding a preliminary mixed catalyst solution of an antimony compound and a trivalent phosphorus compound as a catalyst, the catalyst solution having a haze of 10% or less, at a stage showing an acid value of 1,000 eq/ton or less before initiation of melt polymerization.

Inventors: Fujimori; Yoshihiro (Mie, JP), Hamano; Toshiyuki (Mie, JP), Matsumoto; Hitoshi (Mie, JP), Mino; Kazuyoshi (Mie, JP), Tanaka; Katsuji (Tokyo, JP)

Assignee: Mitsubishi Chemical Corporation

International Classification: C08G 63/00 (20060101); C08G 63/86 (20060101); C08K 3/08 (20060101); C08K 3/00 (20060101); C08G 63/87 (20060101); B29C 049/64 (); C08K 003/08 ()

Expiration Date: 03/13/2018