Title:
POLYESTER FILM AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/203105
Kind Code:
A1
Abstract:
[Problem] To provide a biaxially stretched polyester film which has excellent unsusceptibility to pinhole formation and to bag breakage, is highly hygienic, and has low unevenness in machine-direction physical property. [Solution] A biaxially stretched polyester film characterized by comprising 60-95 mass% poly(butylene terephthalate) resin (A) and 5-40 mass% poly(ethylene terephthalate) resin (B) and satisfying all of the following (1) to (4). (1) To have a piercing strength, as measured in accordance with JIS Z 1707, of 0.6 N/μm or greater. (2) To have a degree of planar orientation of 0.144-0.160. (3) To have degrees of thermal shrinkage through 15-minute heating at 150°C of 0-4% for the machine direction and -1 to 3% for the transverse direction. (4) To have an antimony atom content of 7 ppm or less.
Inventors:
GOTO TAKAMICHI (JP)
TAMARI NOBORU (JP)
HARUTA MASAYUKI (JP)
TAMARI NOBORU (JP)
HARUTA MASAYUKI (JP)
Application Number:
PCT/JP2020/010429
Publication Date:
October 08, 2020
Filing Date:
March 11, 2020
Export Citation:
Assignee:
TOYO BOSEKI (JP)
International Classes:
B29C55/12; B29C48/08; B29C48/285; B32B9/00; B32B27/36; C08G63/84; C08J5/18; C08L67/02; B29K67/00; B29L9/00
Domestic Patent References:
| WO2019021759A1 | 2019-01-31 | |||
| WO2017126563A1 | 2017-07-27 | |||
| WO2018062145A1 | 2018-04-05 |
Foreign References:
| JP2001131276A | 2001-05-15 |
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