Kelly Jean Barton

US Patent:

7989513, Aug 2, 2011

Filed:

Dec 13, 2007

Appl. No.:

11/955521

Inventors:

Vinci Martinez Felix - Kennett Square PA, US
Kelly D. Barton - Athens PA, US

Assignee:

E.I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C08J 5/20
C08L 27/12

US Classification:

521 28, 524544

Abstract:

A process for producing a dispersion of a highly fluorinated ion exchange polymer is provided in which a dispersion of a highly fluorinated ion exchange polymer in a first liquid that includes at least 10 wt % of an organic liquid is atomized and released into a heated gas to produce flowable particles of highly fluorinated ion exchange polymer having dry surface/exteriors and an internal residual moisture content of at least 4 wt %. The particles are dispersed in a second liquid to produce a second dispersion of highly fluorinated ion exchange polymer from which proton exchange membranes and electrodes for fuel cells may be produced.