| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester-based film which has not only excellent mechanical characteristics, dimensional stability and thermal characteristics but also good impact resistance and flex fatigue resistance, furthermore has excellent stiffness, flex fatigue resistance and bag-breaking resistance as a packaging material, and can correspond to the thinning of the film. SOLUTION: This polyester-based film is characterized in that polyethylene terephthalate, and/or a polyester A having a melting point of≥225°C and consisting mainly of ethylene terephthalate units, a polyester B consisting mainly of butylene terephthalate units, and an olefinic polymer are compounded in a mass% ratio of 60 to 90 / 1 to 30 / 1 to 20, and the olefinic polymer has functional groups in an amount of 200 to 2,000 equivalents/ton. COPYRIGHT: (C)2005,JPO&NCIPI
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