Patent ID: 6329031
Filing Date: 2001-12-11
Classification: A61B,C08L,Y10T

Abstract:
A polyester resin composition comprising:(A) 10 to 90% by weight of a polyethylene terephthalate polymer having 100 to 75 mole % of ethylene terephthalate units; and(B) 90 to 10% by weight of a polyester resin, the polyester resin being prepared by polycondensation of the dicarboxylic acid component and glycol component, the dicarboxylic acid component comprising, based on the total amount of the dicarboxylic acid component, 50 to 92 mole % of isophthalic acid or its ester-forming derivative, 5 to 47 mole % of terephthalic acid or its ester-forming derivative and 3 to 45 mole % of 2,6-naphthalenedicarboxylic acid or its ester-forming derivative, and the glycol component comprising, based on the total amount of the glycol component, 75 to 96.5 mole % of ethylene glycol and 3.5 to 25 mole % of diethylene glycol,the polyester resin composition, when molded into a sheet, having an oxygen permeability coefficient of 3.0 cc.multidot.mm/m.sup.2.multidot.day.multidot.atm or less.