Patent ID: 6271338
Filing Date: 2001-08-07
Classification: C08G,C08K

Abstract:
A polyethylene naphthalenedicarboxylate resin composition comprising a polyethylene naphthalenedicarboxylate, an antimony compound, a cobalt compound and a phosphorus compound, wherein:the phosphorus compound has an acid dissociation constant pKa of not less than 1.0 and the phosphorus compound is either phosphorous acid or a compound represented by the following Formula 1: ##STR3##wherein n is 0, 1, or 2;the content of the antimony compound is from 5 to 40 mmol % in terms of antimony trioxide based on the total dicarboxylic acid components constituting the polyethylene naphthalenedicarboxylate;the content of the cobalt compound is from 3 to 35 mmol % based on the total dicarboxylic acid components constituting the polyethylene naphthalenedicarboxylate;the molar ratio of the contents of the antimony compound and the cobalt compound is in the range of cobalt element/antimony element=0.1 to 1.0; andthe polyethylene naphthalenedicarboxylate is produced by either an ester exchange reaction or a direct esterification reaction; provided that when the polyethylene naphthalenedicarboxylate is produced by an ester exchange reaction, the content of the phosphorus compound is from 0.7 to 2.0 times by mol based on the content of the ester exchange reaction catalyst used for the production of the polyethylene naphthalene dicarboxylate,and when the polyethylene naphthalenedicarboxylate is produced by a direct esterification reaction, the content of the phosphorus compound is from 5 to 100 mmol % based on the total dicarboxylic acid components used for the production of the polyethylene naphthalenedicarboxylate.