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Membranes of fluorinated ionomer blended with nonionomeric fluoropolymers for electrochemical cells

  • US 7,557,164 B2
  • Filed: 08/18/2004
  • Issued: 07/07/2009
  • Est. Priority Date: 08/19/2003
  • Status: Expired due to Fees
First Claim
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1. A melt extruded membrane consisting essentially of a melt blended mixture of (a) about 70 to about 95 wt % fluorinated ionomer in acid or salt form or precursor thereof and (b) about 30 to about 5 wt % of two melt-processible crystalline fluoropolymers that are substantially free of ion-exchange groups, and that differ from each other in melting point by at least about 5°

  • C., wherein the first of said two other fluoropolymers that are substantially free of ion-exchange groups has a melting point within about 10°

    C. of the melting point of the fluorinated ionomer, and the second of said two other fluoropolymers that are substantially free of ion-exchange groups has a melting point at least about 15°

    C. higher than the melting point of the fluorinated ionomer.

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