Liquid compositions of fluorinated ion exchange polymers

Patent metadata

Field	Value
Publication number	US-10040875-B2
Application number	US-201113988746-A
Country	US
Kind code	B2
Filing date	Nov 17, 2011
Priority date	Nov 26, 2010
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A liquid composition comprising at least one aprotic organic solvent and at least one fluorinated ion exchange polymer which consists of recurring units derived from a chlorofluoroolefin of formula CF 2 ═CCIY, wherein Y is F or CI, and from at least one fluorinated functional monomer selected among those of formula CF 2 ═CF—O—(CF 2 CF(CF 3 )O) m —(CF 2 ) n SO 2 X, wherein m is an integer equal to 0 or 1, n is an integer from 0 to 10 and X is chosen among halogens (CI, F, Br, I), —O − M + , wherein M + is a cation selected among H + , NH 4 + , K + , Li + , Na + , or mixtures thereof is disclosed. The liquid composition is suitable for the preparation of ion exchange membranes, in particular composite membranes, for use in fuel cell applications.

First claim

The invention claimed is:

1. A liquid composition comprising:
at least one aprotic organic solvent; and
at least one fluorinated ion exchange polymer dissolved or dispersed in said at least one aprotic organic solvent, said fluorinated ion exchange polymer consisting of: 55 to 92 mol % of recurring units derived from a chlorofluoroolefin of formula CF 2 ═CClY, wherein Y is either F or Cl, and from 6 to 60 mol % of recurring units derived from at least one functional monomer of formula CF 2 ═CF—O—(CF 2 CF(CF 3 )O) m —(CF 2 ) n SO 2 X, wherein m is an integer equal to 0 or 1, n is an integer from 0 to 10 and X is selected from the group consisting of halogens and —O − M + , wherein M + is a cation selected from the group consisting of H + , NH 4 + , K + , Li + , Na + , and mixtures thereof.

2. The liquid composition according to claim 1 wherein, when X is —O − M + , and M + is a cation selected from the group consisting of H + , NH 4 + , K + , Li + , Na + , and mixtures thereof, wherein the aprotic organic solvent is a polar aprotic organic solvent.

3. The liquid composition according to claim 1 , wherein X is selected from the group consisting of F, Cl, Br, and I, and wherein the aprotic organic solvent is an apolar aprotic organic solvent.

4. The liquid composition according to claim 1 , wherein said aprotic organic solvent has a boiling temperature of at least 50° C.

5. The liquid composition according to claim 1 , wherein the fluorinated ion exchange polymer is present in an amount of at least 5 wt % with respect to the total weight of the liquid composition.

6. The liquid composition according to claim 1 further comprising catalyst particles.

7. The liquid composition according to claim 1 , wherein the chlorofluoroolefin is CF 2 ═CCIF.

8. The liquid composition according to claim 1 , wherein the at least one functional monomer is selected from monomers of formula CF 2 ═CF—O—(CF 2 ) n —SO 2 X, wherein n is an integer from 0 to 10.

9. A process for preparing the liquid composition of claim 1 , said process comprising dissolving a fluorinated ion exchange polymer consisting of 55 to 92 mol % of recurring units derived from a chlorofluoroolefin of formula of CF 2 ═CClY, wherein Y is either F or Cl, and from 6 to 60 mole % of recurring units derived from at least one functional monomer of formula CF 2 ═CF—O—(CF 2 CF(CF 3 )O) m —(CF 2 ) n SO 2 X, wherein m is an integer equal to 0 or 1, n is an integer from 0 to 10 and X is selected from the group consisting of halogens, —O − M + , wherein M + is a cation selected from the group consisting of H + , NH 4 + , K + , Li + , Na + , and mixtures thereof in an aprotic organic solvent at atmospheric pressure.

10. A process for manufacturing an ion exchange membrane, the process comprising casting or coating the liquid composition of claim 1 .

11. An ion exchange membrane obtained by the process of claim 10 .

12. The process of claim 10 , wherein the casting or coating comprises impregnating a porous support with the liquid composition.

13. A process for manufacturing an electrocatalytic layer comprising printing or coating the liquid composition of claim 6 .

14. The liquid composition according to claim 8 , wherein n is an integer from 2 to 6.

15. The liquid composition according to claim 1 , wherein X is —O-M + and M + is selected from H + , NH 4 + , K + and Na + .

16. The liquid composition according to claim 1 , wherein X is a halogen selected from Cl, F, Br, and I.

Assignees

• Merlo Luca
• Oldani Claudio
• Arcella Vincenzo
• Solvay Specialty Polymers It

Inventors

• Merlo Luca
• Oldani Claudio
• Arcella Vincenzo

Classifications

• C08J3/091

  characterised by the chemical constitution of the organic liquid · CPC title

• H01M8/0289

  Means for holding the electrolyte (solid polymer electrolytes H01M8/1018) · CPC title

• C08J5/2237

  containing fluorine · CPC title

• C08J3/11

  from solid polymers · CPC title

• C08J3/09

  in organic liquids · CPC title