Title:
BIAXIALLY ORIENTED POLYESTER FILM
Document Type and Number:
WIPO Patent Application WO/2023/157729
Kind Code:
A1
Abstract:
[Problem] To provide a polyester film which has excellent cold formability and in which the occurrence of post-forming springback or curl can be suppressed. [Solution] The present invention pertains to a biaxially oriented polyester film containing terephthalic acid and ethylene glycol as main components, wherein the puncture strength is 0.45-0.80 N/μm, the thermal shrinkage at 150°C is 2.5% or less in both the MD direction and the TD direction, the dynamic friction coefficient μd between a metal plate and at least one surface of the film is 0.10-0.50, the stress attenuation rate, which is expressed by equation (1): stress attenuation rate(%)=100×(σ0-σ1)/σ0, in a tensile stress relaxation test at 25°C is 15.0% or more in both the MD direction and the TD direction, and the content of an isophthalic acid component with respect to the total dicarboxylic acid components in the film is 0.02-2.0 mol%.
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Inventors:
GOTO TAKAMICHI (JP)
MANABE NOBUYUKI (JP)
TAMARI NOBORU (JP)
MANABE NOBUYUKI (JP)
TAMARI NOBORU (JP)
Application Number:
PCT/JP2023/004184
Publication Date:
August 24, 2023
Filing Date:
February 08, 2023
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
C08J5/18; B29C55/12; B32B15/09; B32B27/36; B65D65/40; H01M50/105; H01M50/121; H01M50/129
Domestic Patent References:
| WO2021117736A1 | 2021-06-17 |
Foreign References:
| JP2015147309A | 2015-08-20 | |||
| JP2017149987A | 2017-08-31 |
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