Title:
BIAXIALLY ORIENTED POLYESTER FILM
Document Type and Number:
WIPO Patent Application WO/2023/157731
Kind Code:
A1
Abstract:
[Problem] To provide a polyester film which has excellent cold formability and can suppress the occurrence of springback and curling after forming. [Solution] This biaxially oriented polyester film comprises, as main components, a terephthalic acid and an ethylene glycol, and has: a puncture strength of 0.45 N/μm to 0.80 N/μm; a thermal shrinkage rate at 150 °C of at most 2.5% in both MD and TD directions; a dynamic friction coefficient μd between at least one side of the film and a metal plate of 0.10 to 0.50; and a stress relaxation rate (%), represented by equation (1), stress relaxation rate (%)=100×(σ0-σ1)/σ0, of at least 15.0% in both the MD and TD directions, in a tensile stress relaxation test at 25 °C.
Inventors:
GOTO TAKAMICHI (JP)
TAMARI NOBORU (JP)
TAMARI NOBORU (JP)
Application Number:
PCT/JP2023/004186
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; H01M50/119; H01M50/121; H01M50/129; H01M50/131
Domestic Patent References:
| WO2021117736A1 | 2021-06-17 |
Foreign References:
| JP2015147309A | 2015-08-20 | |||
| JP2017149987A | 2017-08-31 |
Download PDF: