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:
Sep. 28, 2010
Filed:
Aug. 30, 2005
Masaru Yoshida, Takasaki, JP;
Masaharu Asano, Takasaki, JP;
Tetsuya Yamaki, Takasaki, JP;
Soji Nishiyama, Ibaraki, JP;
Toshimitsu Tachibana, Ibaraski, JP;
Yozo Nagai, Ibaraki, JP;
Masaru Yoshida, Takasaki, JP;
Masaharu Asano, Takasaki, JP;
Tetsuya Yamaki, Takasaki, JP;
Soji Nishiyama, Ibaraki, JP;
Toshimitsu Tachibana, Ibaraski, JP;
Yozo Nagai, Ibaraki, JP;
Japan Atomic Energy Agency, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki, JP;
Abstract
The objective of the invention is to solve the problems of conventional polymer electrolyte membranes, including small ion-exchange capacity and low oxidation and methanol resistance. A polymer film substrate is irradiated with γ-rays, electron beams or other radiations to perform multi-graft polymerization with functional monomers and then the polymer film substrate containing the grafted molecular chains or the graft molecular chains into which sulfonic acid groups have been introduced is crosslinked by irradiation to produce a polymer electrolyte membrane that has outstanding oxidation resistance, dimensional stability, electrical conductivity and methanol resistance and which can be controlled in ion-exchange capacity over a wide range.