Title:
BIAXIALLY STRETCHED POLYESTER FILM
Document Type and Number:
WIPO Patent Application WO/2022/131360
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a polyester film which has excellent rigidity and excellent transparency, while being suitable for the production of a molded body, a label, an optical film and the like. A biaxially stretched polyester film which contains a polyester resin (I) that is mainly composed of terephthalic acid and ethylene glycol, wherein: the polyester resin (I) has a recrystallization temperature of from 160°C to 193°C as determined by DSC; 60% by mass or more of the polyester resin (I) is contained relative to 100% by mass of the whole film; the tensile elastic modulus both in the longitudinal direction and in the width direction is 3,200 MPa or more; and the total of the tensile elastic modulus in the longitudinal direction and the tensile elastic modulus in the width direction is 7,000 MPa or more.
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Inventors:
MATSUMURA MEI (JP)
SHIMIZU AKIRA (JP)
SHIMIZU AKIRA (JP)
Application Number:
PCT/JP2021/046719
Publication Date:
June 23, 2022
Filing Date:
December 17, 2021
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
C08J5/18; B32B27/36; C08J7/04
Domestic Patent References:
| WO2004108408A1 | 2004-12-16 | |||
| WO2021200754A1 | 2021-10-07 |
Foreign References:
| JP2014043571A | 2014-03-13 | |||
| JP2005288996A | 2005-10-20 | |||
| JPH08244112A | 1996-09-24 | |||
| JPS5569620A | 1980-05-26 | |||
| JPH09295344A | 1997-11-18 | |||
| JPH05339476A | 1993-12-21 |
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