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:
Mar. 20, 2012
Filed:
Dec. 27, 2005
Takashi Yamashita, Tsukuba, JP;
Shinji Nakai, Tsukuba, JP;
Hiroyuki Ogi, Tsukuba, JP;
Tomohiro Ono, Tsukuba, JP;
Takashi Yamashita, Tsukuba, JP;
Shinji Nakai, Tsukuba, JP;
Hiroyuki Ogi, Tsukuba, JP;
Tomohiro Ono, Tsukuba, JP;
Kuraray Co., Ltd., Kurashiki-shi, JP;
Abstract
This invention relates to a polymer electrolyte membrane for polymer electrolyte fuel cells, comprising a block copolymer which comprises, as its constituents, a polymer block (A) having as a main unit an aromatic vinyl compound unit whose α-carbon is quaternary carbon, and a flexible polymer block (B), and has ion-conducting groups on the polymer block (A). The electrolyte membrane of this invention is economical, mild to the environment and excellent in moldability and chemical stability and thus durability, and, therefore, can suitably be used in membrane electrode assemblies and polymer electrolyte fuel cells.