Title:
BIAXIALLY ORIENTED POLYESTER FILM
Document Type and Number:
WIPO Patent Application WO/2023/157730
Kind Code:
A1
Abstract:
[Problem] To provide a polyester film which has excellent cold formability and which can suppress the occurrence of spring-back and curling after forming. [Solution] Provided is a biaxially oriented polyester film which has terephthalic acid and ethylene glycol as main components. The puncture strength is 0.45 N/μm to 0.80 N/μm; the thermal shrinkage at 150°C in both the MD direction and the TD direction is 2.5% or less; the dynamic friction coefficient μd between at least one surface of the film and a metal plate is 0.10 to 0.50; in a tensile stress relaxation test at 25°C, the stress decay rate indicated by formula (1) stress decay rate (%) = 100 × (σ0-σ1)/ σ0 in both the MD direction and the TD direction is 15.0% or more; and the content of radiocarbon (C14) with respect to the total carbon in the film is 10% to 20%.
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Inventors:
GOTO TAKAMICHI (JP)
MANABE NOBUYUKI (JP)
TAMARI NOBORU (JP)
MANABE NOBUYUKI (JP)
TAMARI NOBORU (JP)
Application Number:
PCT/JP2023/004185
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; H01M50/121; H01M50/129; H01M50/133
Domestic Patent References:
| WO2021117736A1 | 2021-06-17 |
Foreign References:
| JP2016069432A | 2016-05-09 | |||
| JP2015147309A | 2015-08-20 | |||
| JP2017149987A | 2017-08-31 |
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