US 12,479,992 B2
Biaxially oriented polyester film and production method therefor
Nobuyuki Manabe, Inuyama (JP); and Masayuki Haruta, Inuyama (JP)
Assigned to TOYOBO CO., LTD., Osaka (JP)
Appl. No. 18/262,163
Filed by TOYOBO CO., LTD., Osaka (JP)
PCT Filed Jan. 26, 2022, PCT No. PCT/JP2022/002851
§ 371(c)(1), (2) Date Jul. 19, 2023,
PCT Pub. No. WO2022/168702, PCT Pub. Date Aug. 11, 2022.
Claims priority of application No. 2021-015840 (JP), filed on Feb. 3, 2021.
Prior Publication US 2024/0124705 A1, Apr. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 5/18 (2006.01); B29C 48/00 (2019.01); B29C 48/08 (2019.01); B29C 48/28 (2019.01); B29C 48/285 (2019.01); C08L 67/02 (2006.01); B29C 55/12 (2006.01); B29K 67/00 (2006.01)
CPC C08L 67/02 (2013.01) [B29C 48/0018 (2019.02); B29C 48/022 (2019.02); B29C 48/08 (2019.02); B29C 48/28 (2019.02); B29C 48/288 (2019.02); C08J 5/18 (2013.01); B29C 55/12 (2013.01); B29K 2067/00 (2013.01); B29K 2995/0026 (2013.01); B29K 2995/0053 (2013.01); B29K 2995/0072 (2013.01); C08J 2367/02 (2013.01); C08J 2467/02 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A biaxially oriented polyester film 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 all of the following requirements (1) to (3):
(1) a number of fine protrusions each having a height of less than 3 nm per area of 4×10−12 m2 is 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 4×10−12 m2 is 300 or more and 600 or less; and
(3) an arithmetic mean height Sa is 0.010 μm or more and 0.025 μm or less.