	US 11,919,983 B2
	Vinylidene fluoride copolymer particles and use thereof
Kayoko Okada, Tokyo (JP); Yoshiyuki Nagasawa, Tokyo (JP); Aya Oikawa, Tokyo (JP); Yumeno Suzuki, Tokyo (JP); and Shota Kobayashi, Tokyo (JP)
Assigned to KUREHA CORPORATION, Tokyo (JP)
Appl. No. 16/485,585
Filed by Kureha Corporation, Tokyo (JP)
PCT Filed Jan. 18, 2018, PCT No. PCT/JP2018/001309 § 371(c)(1), (2) Date Aug. 13, 2019, PCT Pub. No. WO2018/179696, PCT Pub. Date Oct. 4, 2018.
Claims priority of application No. 2017-072858 (JP), filed on Mar. 31, 2017.
Prior Publication US 2021/0179756 A1, Jun. 17, 2021
Int. Cl. C08F 214/22 (2006.01); C08F 14/22 (2006.01); C09D 127/16 (2006.01); H01M 50/426 (2021.01); H01M 50/46 (2021.01); C08K 3/04 (2006.01); C08K 3/22 (2006.01)

CPC C08F 214/225 (2013.01) [C09D 127/16 (2013.01); H01M 50/426 (2021.01); H01M 50/461 (2021.01); C08K 3/04 (2013.01); C08K 3/22 (2013.01); C08K 2003/2203 (2013.01); C08K 2003/2262 (2013.01); C08K 2003/2289 (2013.01); C08K 2003/2293 (2013.01)]

14 Claims

1. A copolymer particle comprising vinylidene fluoride copolymer having a constituent unit derived from vinylidene fluoride, and a constituent unit derived from a compound having an oxygen atom-containing functional group, wherein the vinylidene fluoride copolymer particle has a surface and a core which each contain vinylidene fluoride copolymer, and

a ratio of oxygen atom of the vinylidene fluoride copolymer in the surface of the vinylidene fluoride copolymer particle is higher than a ratio of oxygen atom of the vinylidene fluoride copolymer in the core of the vinylidene fluoride copolymer particle.