LIQUID COMPOSITION, COATING LIQUID FOR FORMING CATALYST LAYER, AND METHOD FOR PRODUCING MEMBRANE ELECTRODE ASSEMBLY

Title:

LIQUID COMPOSITION, COATING LIQUID FOR FORMING CATALYST LAYER, AND METHOD FOR PRODUCING MEMBRANE ELECTRODE ASSEMBLY

Document Type and Number:

WIPO Patent Application WO/2017/033686

Kind Code:

A1

Abstract:

Provided are: a liquid composition which is capable of making the occurrence of cracks less likely during the formation of a solid polymer electrolyte membrane or a catalyst layer; a coating liquid for forming a catalyst layer; and a method for producing a membrane electrode assembly. A dispersion liquid having a concentration of a copolymer of 13-26% by mass, said copolymer having a constituent unit represented by -[CF2-CF{(OCF2CFX)mOp(CF2)nSO3H}]- (wherein X is F or CF3, m is 1-3, p is 0 or 1 and n is an integer of 1-12) and a constituent unit derived from tetrafluoroethylene, is prepared by dispersing the copolymer into a medium (excluding a fluorine-containing solvent) that contains water and a hydrocarbon alcohol; and a liquid composition is prepared by mixing the dispersion liquid and a fluorine-containing solvent so that the total of the concentration of the copolymer and the concentration of the fluorine-containing solvent is 17-35% by mass.

Inventors:

WATABE HIROYUKI (JP)
HOMMURA SATORU (JP)
TANUMA TOSHIHIRO (JP)

Application Number:

PCT/JP2016/072683

Publication Date:

March 02, 2017

Filing Date:

August 02, 2016

Export Citation:

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Assignee:

ASAHI GLASS CO LTD (JP)

International Classes:

C08J3/09; C08K5/02; C08K5/05; C08K5/06; C08L27/18; C08L29/10; H01M4/86; H01M4/88; H01M8/02; H01M8/10

Domestic Patent References:

WO2011013578A1	2011-02-03
WO2009125695A1	2009-10-15

Foreign References:

JP2009301755A	2009-12-24
JP2009037953A	2009-02-19
JP2012018871A	2012-01-26
JP2008016431A	2008-01-24
JP2001126739A	2001-05-11

Other References: