	US 12,410,266 B2
	Method for manufacturing fluoropolymer
Yoshinori Nanba, Osaka (JP); Kenji Ichikawa, Osaka (JP); Yohei Fujimoto, Osaka (JP); Hirotoshi Yoshida, Osaka (JP); Hiroyuki Sato, Osaka (JP); Taketo Kato, Osaka (JP); Kengo Ito, Osaka (JP); Sumi Ishihara, Osaka (JP); Masahiro Higashi, Osaka (JP); Satoru Yoneda, Osaka (JP); Hirokazu Aoyama, Osaka (JP); Masamichi Sukegawa, Osaka (JP); Yosuke Kishikawa, Osaka (JP); Takahiro Taira, Osaka (JP); Chiaki Okui, Osaka (JP); and Taku Yamanaka, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Jun. 30, 2023, as Appl. No. 18/216,644.
Application 18/216,644 is a continuation of application No. 16/976,945, granted, now 11,767,379, previously published as PCT/JP2019/008234, filed on Mar. 1, 2019.
Claims priority of application No. 2018-036879 (JP), filed on Mar. 1, 2018; and application No. 2018-216864 (JP), filed on Nov. 19, 2018.
Prior Publication US 2023/0340169 A1, Oct. 26, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 14/26 (2006.01); B29C 55/00 (2006.01); B29K 27/18 (2006.01); C08F 2/22 (2006.01); C08F 2/44 (2006.01); C08F 114/26 (2006.01); C08F 214/26 (2006.01); C08F 261/06 (2006.01)

CPC C08F 14/26 (2013.01) [B29C 55/005 (2013.01); C08F 2/22 (2013.01); C08F 2/44 (2013.01); C08F 114/26 (2013.01); C08F 214/26 (2013.01); C08F 261/06 (2013.01); B29K 2027/18 (2013.01)]

14 Claims

1. A method for producing a fluoropolymer, comprising polymerizing a fluoromonomer in an aqueous medium in the presence of a polymer (1) and substantially in the absence of a fluorine-containing surfactant where an amount of the fluorine-containing surfactant in the aqueous medium is 10 ppm or less to provide a fluoropolymer, the polymer (1) having a number average molecular weight of 0.3×10⁴or more and comprising a polymerized unit (1) derived from a monomer represented by the following general formula (1):

CX₂═CY(—CZ₂—O—Rf-A) (1)

wherein X is the same or different and is —H or —F; Y is —H, —F, an alkyl group, or a fluorine-containing alkyl group; Z is the same or different and is —H, —F, an alkyl group, or a fluoroalkyl group; Rf is a fluorine-containing alkylene group having 1 to 40 carbon atoms or a fluorine-containing alkylene group having 2 to 100 carbon atoms and having an ether bond; and A is —COOM, —SO₃M, or —OSO₃M, wherein M is —H, a metal atom, —NR⁷₄, imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, wherein R⁷is H or an organic group, with the proviso that at least one of X, Y, and Z contains a fluorine atom.