Process for producing liquid composition and process for producing catalyst layer-forming coating liquid

Patent metadata

Field	Value
Publication number	US-10457760-B2
Application number	US-201815904578-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Aug 31, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A process for producing a liquid composition, which includes holding a fluorinated polymer having —SO2F groups at from 140 to 160° C. for at least 45 minutes, cooling it to less than 110° C. at a rate of at least 50° C./min, converting the —SO2F groups in the fluorinated polymer to ion exchange groups to obtain a fluorinated polymer having ion exchange groups, and mixing the fluorinated polymer having ion exchange groups and a liquid medium.

First claim

What is claimed is:

1. A process for producing a liquid composition, which comprises
holding a fluorinated polymer having —SO 2 F groups at from 140 to 160° C. for at least 45 minutes,
cooling it to less than 110° C. at a rate of at least 50° C./min,
converting the —SO 2 F groups in the fluorinated polymer to ion exchange groups to obtain a fluorinated polymer having ion exchange groups, and
mixing the fluorinated polymer having ion exchange groups and a liquid medium.

2. A process for producing a liquid composition, which comprises
cooling a fluorinated polymer having —SO 2 F groups in a melt state to from 140 to 160° C. and holding it at from 140 to 160° C. for at least 10 minutes,
cooling it to less than 110° C. at a rate of at least 50° C./min,
converting the —SO 2 F groups in the fluorinated polymer to ion exchange groups to obtain a fluorinated polymer having ion exchange groups, and
mixing the fluorinated polymer having ion exchange groups and a liquid medium.

3. The process for producing a liquid composition according to claim 1 , wherein the fluorinated polymer having —SO 2 F groups has either one or both of structural units represented by the following formula (u1) and structural units represented by the following formula (u2), and structural units derived from tetrafluoroethylene:

wherein Q 1 is a single bond or a perfluoroalkylene group which may have an etheric oxygen atom, Y 1 is a fluorine atom or a monovalent perfluoroorganic group, s is 0 or 1; Q 21 is a pefluoroalkylene group which optionally having an etheric oxygen atom, Q 22 is a single bond or a perfluoroalkylene group which optionally having an etheric oxygen atom, Y 2 is a fluorine atom or a monovalent perfluoroorganic group, and t is 0 or 1.

4. The process for producing a liquid composition according to claim 3 , wherein the fluorinated polymer having ion exchange groups has an ion exchange capacity of from 0.5 to 1.8 meq/g dry resin when it has structural units represented by the formula (u1) and has no structural units represented by the formula (u2), or from 0.5 to 2.8 meq/g dry resin when it has structural units represented by the formula (u2).

5. The process for producing a liquid composition according to claim 1 , wherein the TQ value of the fluorinated polymer having —SO 2 F groups is from 150 to 350° C.

6. A process for producing a catalyst layer-forming coating liquid, which comprises preparing a liquid composition by the process for producing a liquid composition as defined in claim 1 , subjecting the liquid composition to filtration through a filter, and mixing the liquid composition subjected to filtration through a filter and a catalyst to prepare a catalyst layer-forming coating liquid.

Assignees

• Agc Inc

Inventors

• Watabe Hiroyuki
• Wakabayashi Hirokazu

Classifications

• H01M4/8828

  Coating with slurry or ink · CPC title

• C08F16/24

  Monomers containing halogen · CPC title

• H01M4/8668 Primary

  Binders · CPC title

• H01M8/1023

  having only carbon, e.g. polyarylenes, polystyrenes or polybutadiene-styrenes · CPC title

• H01M8/1039

  halogenated, e.g. sulfonated polyvinylidene fluorides · CPC title