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:
Nov. 25, 2025
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, is an environmentally friendly polyester film, and has little variations in physical properties in the machine direction, and a production method therefor. The biaxially oriented polyester film is formed of a polyester resin composition containing particles and 50% by weight or more of a polyester resin composed of biomass-derived ethylene glycol and fossil fuel-derived dicarboxylic acid units, wherein at least one surface of the biaxially oriented polyester film meets requirements (1) to (3): (1) a number of fine protrusions each having a height of less than 3 nm per area of 4×10mis 250-600; (2) a number of fine protrusions each having a height of 3 nm or more per area of 4×10mis 300-600; and (3) an arithmetic mean height Sa is 0.010-0.025 μm.