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. 02, 1999
Filed:
May. 09, 1997
Applicant:
Inventor:
Warren Howard Buck, Aston, PA (US);
Assignee:
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; B05D / ; C08J / ; C08F / ;
U.S. Cl.
CPC ...
20415715 ; 427115 ; 427243 ; 427337 ; 521 27 ; 521 28 ; 521 30 ; 521 33 ;
Abstract
A process for making a cation exchange membranes includes impregnating a film of highly fluorinated sulfonic acid polymer in sulfonyl fluoride form with a compound selected from the group having the formula R-SO.sub.2 F, wherein R is a straight chain, branched or cyclic, highly fluorinated alkyl group having 1 to 30 carbon atoms. The impregnated film is irradiated with the radiation dose being in the range of 0.1 to 15 MRad. After irradiation, the film is hydrolyzed to form the membrane. The membranes have enhanced electrochemical properties when employed in electrochemical cells including improved performance under low humidity conditions.