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:
Jun. 16, 2026
Filed:
Jan. 26, 2022
Toyobo Co., Ltd., Osaka, JP;
Nobuyuki Manabe, Inuyama, JP;
Masayuki Haruta, Inuyama, JP;
TOYOBO CO., LTD., Osaka, JP;
Abstract
The invention provides a biaxially oriented polyester film, which exhibits excellent transparency, is easily subjected to secondary processing, and is produced using a polyester resin obtained without using an antimony compound as a polymerization catalyst, and a production method therefor. At least one surface of the biaxially oriented polyester film meets requirements (1) to (4): (1) a number of fine protrusions each having a height of less than 3 nm per area of 4×10mis 250 or more and 600 or less; (2) a number of fine protrusions each having a height of 3 nm or more per area of 4×10mis 300 or more and 600 or less; (3) an arithmetic mean height Sa is 0.010 μm or more and 0.025 μm or less; and (4) an antimony content in the film is 10 ppm or less.