| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester film excellent in mechanical strength, heat resistance, chemical resistance, insulation properties and dimensional stability and suitable for use in the application where there is need for the film to be subjected to boiling treatment or retort treatment for which the film is required to have toughness, pinhole resistance, resistance to bag breakage by dropping and the like, the application where the film is required to undergo thermoforming or vacuum forming and the application where the film is used for packaging of moisture-containing food products, chemicals or the like. SOLUTION: The polyester film is a film formed from a polyester-based resin composition produced by blending 10-90 wt.% of (A) a polyethylene terephthalate-based resin and 90-10 wt.% of (B) a polybutylene terephthalate-based resin wherein the film has a plane orientation coefficient of 0.155 or more. COPYRIGHT: (C)2005,JPO&NCIPI
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