US 12,447,726 B2
Cavity-containing polyester film
Mei Matsumura, Tsuruga (JP); Shotaro Nishio, Tsuruga (JP); and Akira Shimizu, Tsuruga (JP)
Assigned to TOYOBO CO., LTD., Osaka (JP)
Appl. No. 18/020,533
Filed by TOYOBO CO., LTD., Osaka (JP)
PCT Filed Sep. 8, 2021, PCT No. PCT/JP2021/033057
§ 371(c)(1), (2) Date Feb. 9, 2023,
PCT Pub. No. WO2022/059580, PCT Pub. Date Mar. 24, 2022.
Claims priority of application No. 2020-154520 (JP), filed on Sep. 15, 2020.
Prior Publication US 2023/0295421 A1, Sep. 21, 2023
Int. Cl. B32B 27/36 (2006.01); B32B 27/08 (2006.01); B32B 27/20 (2006.01); C08K 3/22 (2006.01); C08L 67/02 (2006.01); C09J 7/29 (2018.01); G09F 3/02 (2006.01)
CPC B32B 27/36 (2013.01) [B32B 27/08 (2013.01); B32B 27/205 (2013.01); C08K 3/22 (2013.01); C08L 67/02 (2013.01); C09J 7/29 (2018.01); G09F 3/02 (2013.01); B32B 2250/03 (2013.01); B32B 2250/244 (2013.01); B32B 2250/40 (2013.01); B32B 2264/1022 (2020.08); B32B 2264/303 (2020.08); B32B 2272/00 (2013.01); B32B 2307/4023 (2013.01); B32B 2307/54 (2013.01); B32B 2307/72 (2013.01); B32B 2519/00 (2013.01); C08K 2003/2237 (2013.01); G09F 2003/0229 (2013.01); G09F 2003/0257 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A cavity-containing polyester film comprising a layer A containing cavities inside and a layer B disposed on both surfaces of the layer A, wherein
the layer A is formed of a composition A containing a polyester-based resin A and a polypropylene-based resin,
the layer B is formed of a composition B containing inorganic particles and a polyester-based resin B,
both of the polyester-based resin A and the polyester-based resin B contain a recycled bottle raw material, an amount of the recycled bottle raw material contained in the composition B is larger than an amount of the recycled bottle raw material contained in the composition A,
a thickness of the cavity-containing polyester film is 75 μm or more and 300 μm or less,
an amount of self-weight deflection of the film in at least one direction is 60 mm or more and 97 mm or less, and
wherein an elastic modulus of the film in the deflection direction is 2500 MPa or more and 7500 MPa or less.