Composition production method, and composition

Patent metadata

Field	Value
Publication number	US-12410267-B2
Application number	US-202017606304-A
Country	US
Kind code	B2
Filing date	Apr 27, 2020
Priority date	Apr 26, 2019
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A method for producing a composition including a step A of performing ultrafiltration, microfiltration, dialysis membrane treatment, or a combination thereof on a composition containing water and a fluoropolymer. The fluoropolymer is a polymer having a structural unit M3 derived from a monomer represented by general formula (1):

CX 2 ═CY(—CZ 2 —O—Rf-A)  (1)

where 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, —SO 3 M, —OSO 3 M, or —C(CF 3 ) 2 OM, wherein M is as defined herein; provided that at least one of X, Y, and Z includes a fluorine atom.

First claim

The invention claimed is:

1. A method for producing a composition, the method comprising a step A of performing ultrafiltration, microfiltration, dialysis membrane treatment, or a combination thereof on a composition comprising water and a water-soluble fluoropolymer, wherein the fluoropolymer is a polymer comprising a structural unit M3 derived from a monomer represented by general formula (1):
CX 2 ═CY(—CZ 2 —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, —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;
provided that at least one of X, Y, and Z comprises a fluorine atom,
wherein a content of the structural unit M3 in the fluoropolymer is 60 mol % or more based on all polymerization units.

2. The production method according to claim 1 , wherein in the general formula (1), at least one X is —H.

3. The production method according to claim 1 , wherein in the general formula (1), both X are —H.

4. The production method according to claim 1 , wherein in the general formula (1), Rf is a fluorine-containing alkylene group having 1 to 10 carbon atoms or a fluorine-containing alkylene group having 2 to 12 carbon atoms and having an ether bond.

5. The production method according to claim 1 , wherein the structural unit M3 is a structural unit (1A) based on a monomer represented by the following general formula (1A):
CH 2 ═CF(—CF 2 —O—Rf-A)  (1A)

wherein Rf and A are as described above.

6. The production method according to claim 1 , wherein the structural unit M3 is a structural unit (1a) based on a fluoroallyl ether compound represented by the following general formula (1a):
CX 2 ═CFCF 2 —O—(CF(CF 3 )CF 2 O) n5 —CF(CF 3 )-A  (1a)

wherein each X is the same and represents F or H; n5 represents 0 or an integer of 1 to 10; and A is as defined above.

7. The production method according to claim 1 , wherein A is —COOM.

8. The production method according to claim 1 , wherein M is —H, —Na, —K, —Li, or —NH 4 .

9. The production method according to claim 1 , wherein the fluoropolymer is a polymer in which a structural unit N3 derived from a monomer copolymerizable with the monomer represented by the general formula (1) is 0 to 40 mol % based on all polymerization units.

10. The production method according to claim 9 , wherein the structural unit N3 is a structural unit derived from tetrafluoroethylene.

11. The production method according to claim 1 , wherein the fluoropolymer is a polymer having a number average molecular weight of 0.5×10 4 to 75.0×10 4 .

12. The production method according to claim 1 , wherein the fluoropolymer is a polymer in which a proportion of carbon atom-bonded hydrogen atoms replaced with fluorine atoms is 50% or more, which comprises an ionic group, and which has an ion exchange rate of 53 or less.

13. The production method according to claim 1 , wherein a proportion of carbon atom-bonded hydrogen atoms replaced with fluorine atoms in the fluoropolymer is 50% or more.

14. The production method according to claim 1 , wherein the ultrafiltration, the microfiltration, or the dialysis membrane treatment is performed at a temperature of 20° C. or higher.

15. The production method according to claim 1 , wherein the ultrafiltration is performed using an ultrafiltration membrane having a molecular weight cut-off of 1.5×10 4 Da or more.

Assignees

• Daikin Ind Ltd

Inventors

• Higashi Masahiro
• Ishihara Sumi
• Yoneda Satoru
• Kishikawa Yosuke
• Aoyama Hirokazu

Classifications

• C07C43/17

  containing halogen · CPC title

• C02F1/444

  by ultrafiltration or microfiltration · CPC title

• B01D2325/34

  Molecular weight or degree of polymerisation · CPC title

• B01D69/02

  characterised by their properties · CPC title

• B01D61/243

  Dialysis · CPC title