The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2025
Filed:
Jan. 30, 2020
Applicant:
Toyobo Co., Ltd., Osaka, JP;
Inventors:
Masayuki Haruta, Inuyama, JP;
Norimi Tabota, Osaka, JP;
Assignee:
TOYOBO CO., LTD., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J 5/18 (2006.01); B29C 48/00 (2019.01); B29C 55/12 (2006.01); B29K 67/00 (2006.01); B29L 7/00 (2006.01); C08G 63/83 (2006.01);
U.S. Cl.
CPC ...
C08J 5/18 (2013.01); B29C 48/0018 (2019.02); B29C 55/12 (2013.01); C08G 63/83 (2013.01); B29K 2067/00 (2013.01); B29K 2995/0012 (2013.01); B29K 2995/0053 (2013.01); B29K 2995/0097 (2013.01); B29L 2007/008 (2013.01); C08J 2367/00 (2013.01);
Abstract
To provide a biaxially oriented polyester film that has extremely low content of antimony, excellent hygiene, few foreign substances, excellent transparency and heat resistance, and is excellent in printability, workability, and productivity. A biaxially oriented polyester film characterized by a content of antimony in the film of 10 ppm or less, a content of phosphorus in the film of 25 ppm or more and 75 ppm or less, an intrinsic viscosity of the film of 0.51 dl/g or more and 0.70 dl/g or less, and a number of defects with a size of 1 mm or more is 1.0 or less per 1000 square meters of the film.