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:
Feb. 10, 2009
Filed:
Nov. 14, 2005
Nobuyuki Kasahara, Yokohama, JP;
Atsushi Watakabe, Yokohama, JP;
Tetsuji Shimohira, Yokohama, JP;
Hisao Kawazoe, Yokohama, JP;
Ichiro Terada, Yokohama, JP;
Nobuyuki Kasahara, Yokohama, JP;
Atsushi Watakabe, Yokohama, JP;
Tetsuji Shimohira, Yokohama, JP;
Hisao Kawazoe, Yokohama, JP;
Ichiro Terada, Yokohama, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
To provide an electrolyte polymer for polymer electrolyte fuel cells, made of a perfluorinated polymer having sulfonic groups, characterized in that in a test of immersing 0.1 g of the polymer in 50 g of a fenton reagent solution containing 3% of an aqueous hydrogen peroxide solution and 200 ppm of bivalent iron ions at 40° C. for 16 hours, the amount of eluted fluorine ions detected in the solution is not more than 0.002% of the total amount of fluorine in the polymer immersed. The electrolyte polymer of the present invention has very few unstable terminal groups and has an excellent durability, and therefore, is suitable as a polymer constituting an electrolyte membrane for polymer electrolyte fuel cells and a polymer contained in a catalyst layer.