	US 12,312,427 B2
	Member to be compressed for electrochemical devices
Hitoshi Imamura, Osaka (JP); Takahisa Aoyama, Osaka (JP); Hayato Tsuda, Osaka (JP); and Tadaharu Isaka, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/599,086
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
PCT Filed Apr. 3, 2020, PCT No. PCT/JP2020/015319 § 371(c)(1), (2) Date Sep. 28, 2021, PCT Pub. No. WO2020/204163, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-072588 (JP), filed on Apr. 5, 2019.
Prior Publication US 2022/0195088 A1, Jun. 23, 2022
Int. Cl. C08F 214/26 (2006.01); H01M 50/193 (2021.01); H01M 50/42 (2021.01); H01M 50/426 (2021.01)

CPC C08F 214/262 (2013.01) [H01M 50/193 (2021.01); H01M 50/426 (2021.01); C08F 2800/20 (2013.01)]

7 Claims

1. A sealing member to be compressed for an electrochemical device, comprising

a copolymer comprising a tetrafluoroethylene unit and a fluoroalkyl vinyl ether unit, the copolymer having a content of the fluoroalkyl vinyl ether unit based on all the monomer units of the copolymer of 4.5% by mass or more and 4.7% by mass or less, and having a melt flow rate of 10 to 23 g/10 min, wherein the copolymer has a compression set of 85% or less, the compression set being measured after the copolymer in a state of being compression-deformed at a compression deformation rate of 50% is retained at 40° C. for 1,000 hours.