Patent ID: 8297035
Filing Date: 2012-10-30
Classification: C08G,D01D,D01F,D02G,D06P,D10B,Y10T

Abstract:
1. A copolymerized polyester having a main repeating unit comprising ethylene terephthalate, the copolymerized polyester comprising, in an acid component forming the copolymerized polyester, a metal salt of sulfoisophthalic acid (A) and a compound (B) expressed as the following formula (I) in such a state as to simultaneously satisfy the following mathematical expressions (1) and (2), wherein in the formula, R represents a hydrogen atom, or an alkyl group having 1 to 10 carbon atoms, X represents a quaternary phosphonium ion or a quaternary ammonium ion; where in the mathematical expressions, A represents the copolymerization amount (mol %) of the metal salt of sulfoisophthalic acid (A) based on the total amount of acid components forming the copolymerized polyester, and B represents the copolymerization amount (mol %) of the compound (B) expressed as the formula (I) based on the total amount of acid components forming the copolymerized polyester.