Production method of fluoropolymer

Patent metadata

Field	Value
Publication number	US-2025059304-A1
Application number	US-202418926389-A
Country	US
Kind code	A1
Filing date	Oct 25, 2024
Priority date	Apr 28, 2022
Publication date	Feb 20, 2025
Grant date	—

Abstract

There is provided a method for producing a fluoropolymer, the method including polymerizing a fluoromonomer in an aqueous medium to obtain a polymerization dispersion containing the fluoropolymer, and bringing the fluoropolymer in the polymerization dispersion into contact with an alcohol having 3 to 5 carbon atoms to coagulate the fluoropolymer to thereby obtain the fluoropolymer.

First claim

1 . A method for producing a fluoropolymer, the method comprising:
polymerizing a fluoromonomer in an aqueous medium to obtain a polymerization dispersion comprising a fluoropolymer, and bringing the fluoropolymer in the polymerization dispersion into contact with an alcohol having 3 to 5 carbon atoms to coagulate the fluoropolymer to thereby obtain the fluoropolymer, wherein the fluoropolymer is a perfluoroelastomer or a polytetrafluoroethylene.

2 . The production method according to claim 1 , wherein the fluoropolymer is brought into contact with the alcohol by adding the polymerization dispersion obtained by polymerization dropwise to the alcohol or a composition containing the alcohol.

3 . The production method according to claim 1 , wherein a MolLogP of the alcohol is within a range of 0.3 to 1.2.

4 . The production method according to claim 1 , wherein an amount of the alcohol is an amount corresponding to 0.01 to 50 times based on a weight of the fluoropolymer in the polymerization dispersion.

5 . The production method according to claim 1 , wherein the fluoromonomer is polymerized in the presence of a surfactant.

6 . The production method according to claim 1 , wherein the fluoromonomer is polymerized in the presence of a polymer (I) comprising a polymerized unit (I) derived from a monomer (I) represented by the general formula (I):
CX 1 X 3 ═CX 2 R(—CZ 1 Z 2 -A 0 ) m   (I)

wherein X 1 and X 3 are each independently F, Cl, H, or CF 3 ; X 2 is H, F, an alkyl group, or a fluorine-containing alkyl group; A 0 is an anionic group; R is a linking group; Z 1 and Z 2 are each independently H, F, an alkyl group, or a fluorine-containing alkyl group; and m is an integer of 1 or more.

7 . The production method according to claim 6 , wherein the polymer (I) is a polymer (2) comprising a polymerized unit (2) derived from a monomer (2) represented by the general formula (2):
CX 2 ═CY(—O—Rf-A)  (2)

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; 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 or a keto group; and A is —COOM, —SO 3 M, —OSO 3 M or —C(CF 3 ) 2 OM, wherein M is H, a metal atom, NR 7 4 , imidazolium optionally having a substituent, pyridinium optionally having a substituent, or phosphonium optionally having a substituent, and R 7 is H or an organic group.

8 . The production method according to claim 1 , wherein the fluoropolymer is a perfluoroelastomer.

9 . The production method according to claim 1 , wherein the fluoropolymer is a polytetrafluoroethylene.

Assignees

• Daikin Ind Ltd

Inventors

• Kitaichi Masanori
• Morikawa Tatsuya
• Iwasaka Takuma
• Kurasaki Yuto
• Sumino Eisaku
• Takishima Ryo
• Inoue Tomohito
• Kato Taketo
• Ichikawa Kenji
• Ito Kengo
• Okui Chiaki
• Irie Masaki
• Yamanaka Taku

Classifications

• C08F259/08

  on to polymers containing fluorine · CPC title

• C08L27/18

  Homopolymers or copolymers or tetrafluoroethene · CPC title

• C08F116/14

  Monomers containing only one unsaturated aliphatic radical · CPC title

• C08F114/26

  Tetrafluoroethene · CPC title

• C08F214/262

  with fluorinated vinyl ethers · CPC title