| 摘要 |
PURPOSE: A polyester copolymer for extrusion is provided to improve formability, particularly being suitable to extrusion molding, and to improve gas barrier properties, chemical and radiation resistance and transparency, while maintaining good heat resistance. CONSTITUTION: The heat resistant polyester copolymer for extrusion comprises: a glycol component comprised of 20-80wt% of ethylene glycol and 80-20wt% of 1,4-cyclohexane dimethanol where the content of its trans isomer is 50% or more; and 2,6-naphthalene dicarbonic acid. The polyester copolymer has an intrinsic viscosity of 0.6-1.5dl/g and a haze value of 4% or less.
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