	US 12,234,335 B2
	Gas permeable polytetrafluoroethylene stretched film and preparation method thereof
Xinglei Zhao, Jiaxing (CN); Pan Jiang, Jiaxing (CN); Ting Hua, Jiaxing (CN); and Peng Wang, Jiaxing (CN)
Assigned to JIAXING FREBANG NEW MATERIAL TECHNOLOGY CO., LTD, Jiaxing (CN)
Filed by JIAXING FREBANG NEW MATERIAL TECHNOLOGY CO., LTD, Jiaxing (CN)
Filed on Sep. 6, 2024, as Appl. No. 18/827,030.
Application 18/827,030 is a continuation of application No. PCT/CN2023/122387, filed on Sep. 28, 2023.
Claims priority of application No. 202211247190.8 (CN), filed on Oct. 12, 2022.
Prior Publication US 2024/0425657 A1, Dec. 26, 2024
Int. Cl. C08J 5/18 (2006.01); C08F 2/30 (2006.01); C08F 210/06 (2006.01); C08F 214/26 (2006.01); C08F 220/20 (2006.01); C08F 220/24 (2006.01); C08F 222/10 (2006.01); C08L 27/18 (2006.01)

CPC C08J 5/18 (2013.01) [C08F 2/30 (2013.01); C08F 210/06 (2013.01); C08F 214/26 (2013.01); C08F 220/20 (2013.01); C08F 220/24 (2013.01); C08F 222/1065 (2020.02); C08L 27/18 (2013.01); C08J 2327/18 (2013.01)]

9 Claims

1. A gas permeable polytetrafluoroethylene stretched film, comprising: powder of a modified polytetrafluoroethylene resin and powder of a modified fluoropolymer resin; wherein the gas permeable polytetrafluoroethylene stretched film is prepared by mixing the powder of the modified polytetrafluoroethylene resin and the powder of the modified fluoropolymer resin to obtain a product, and stretching the product to obtain the gas permeable polytetrafluoroethylene stretched film;

the powder of the modified fluoropolymer resin is a copolymer of propylene and tetrafluoroethylene;

the modified polytetrafluoroethylene resin is copolymerised by a mixture of a tetrafluoroethylene monomer and a modified monomer;

a mass ratio of the tetrafluoroethylene monomer and the modified monomer is 40:1.5-60:1; and

the structure of the modified monomer is a compound shown in formula I:

wherein m:n=1:20-1:10, x denotes 4, 6, 8, 10.