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. 21, 2009
Filed:
Jun. 25, 2004
Biswajit Choudhury, Kingston, CA;
Mark Gerrit Roelofs, Hockessin, DE (US);
Zhen-yu Yang, Hockessin, DE (US);
Biswajit Choudhury, Kingston, CA;
Mark Gerrit Roelofs, Hockessin, DE (US);
Zhen-Yu Yang, Hockessin, DE (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A fluorinated ion exchange polymer is prepared by grafting a monomer onto a base polymer, wherein the grafting monomer is selected from the group consisting of structure 1a, 1b and mixture thereof; wherein Y is selected from the group consisting of —RSOF, —RSOM, —RNHand —RSON(M)SOR, where in M is hydrogen, an alkali cation or ammonium; and Rand Rare perfluorinated or partially fluorinated, and may optionally include ether oxygens; and n is between 1 and 2 for 1a, or n is between 1 and 3 for 1b. These ion exchange polymers are useful is preparing catalyst coated membranes and membrane electrode assemblies for fuel cells.