Titanium-containing PET copolyester and thickness of the preform and refillable large container made therefrom

摘要

PROBLEM TO BE SOLVED: To provide a titanium-containing PET copolyester.;SOLUTION: The titanium-containing PET copolyester has intrinsic viscosity of 0.72-0.90 dL/g and a maximum amount of heat released during crystallization transition through a DSC analysis at a given heating rate of 20 °C/min being less than 10 joul/g. The titanium-containing PET copolyester contains polyethylene terephthalate as a major component and contains titanium component in an amount of 2-25 ppm based on the total copolyester weight, X mol% of isophthalic acid based on the copolyester, Y mol% of diethylene glycol based on the copolyester, and Z mol% of 2,6-naphthalene dicarboxylic acid based on the copolyester, wherein X, Y, Z conform to the following conditions: 0≤X≤2.5; 1.0≤Y≤2.5; 0≤Z≤2.5; 2.5≤X+Y+Z≤7.5. The PET copolyester is suitable for manufacturing an injection stretch blow molded refillable container having an inner volume of greater than 10 litters and returnable and refillable up to 20 cycles.;COPYRIGHT: (C)2011,JPO&INPIT