Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ion-exchange polymer or process of preparing
Reexamination Certificate
2011-08-02
2011-08-02
Bernshteyn, Michael M (Department: 1762)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ion-exchange polymer or process of preparing
C524S544000
Reexamination Certificate
active
07989513
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.
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Barton Kelly D.
Felix Vinci Martinez
Bernshteyn Michael M
E.I. Du Pont de Nemours and Company
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