Biaxially stretched polyester film and method for producing same

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United States of America Patent

PATENT NO 9518195
APP PUB NO 20140193648A1
SERIAL NO

14241525

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Abstract

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A biaxially stretched polyester film, being a biaxially stretched film including a modified polybutylene terephthalate (modified PBT) and polyethylene terephthalate (PET), wherein a mass ratio (modified PBT/PET) between the modified PBT and PET is 20/80 to 5/95, the modified PBT is a PBT containing 5 to 20% by mass of a polytetramethylene glycol unit having a molecular weight of 600 to 4,000, the amount of tetrahydrofuran (THF) generated by heat treating the biaxially stretched film in a helium gas atmosphere at 180° C. for 30 minutes is 50 μg/g or less, and the biaxially stretched film has tear linearity in a lengthwise direction thereof.

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Patent Owner(s)

  • UNITIKA LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Okuzu, Takayoshi Kyoto, JP 13 33
Suzuki, Tomoharu Kyoto, JP 28 281

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