The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 2018
Filed:
Oct. 31, 2017
Asahi Glass Company, Limited, Chiyoda-ku, JP;
Satoru Hommura, Chiyoda-ku, JP;
Hiroyuki Watabe, Chiyoda-ku, JP;
Masahiro Kaseda, Chiyoda-ku, JP;
Toshihiro Tanuma, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Chiyoda-ku, JP;
Abstract
To provide a method for producing a liquid composition or a coating liquid for forming a catalyst layer, which can make cracking less likely to occur at the time of forming a solid polymer electrolyte membrane or a catalyst layer; and a method for producing a membrane electrode assembly, which can make cracking less likely to occur at the time of forming the catalyst layer or the solid polymer electrolyte membrane. This liquid composition is prepared by dispersing in a medium containing water and a hydrocarbon-type alcohol a polymer (x) having a structural unit having a ring structure and a structural unit having an ion exchange group, or a polymer (y) having either one or both of a structural unit having two ion-exchange groups in a pendant group and a structural unit having one ion exchange group in a short-chain pendant group, to prepare a dispersion in which the concentration of the polymer (x) or the polymer (y) is from 10 to 26 mass %, and mixing the dispersion and a fluorinated solvent so that the sum of the concentration of the polymer (x) or the polymer (y) and the concentration of the fluorinated solvent becomes to be from 12 to 35 mass %.