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Porous PTFE Materials and Articles Produced Therefrom

  • US 20080053892A1
  • Filed: 10/31/2007
  • Published: 03/06/2008
  • Est. Priority Date: 07/18/2005
  • Status: Abandoned Application
First Claim
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1. A method of forming a porous PTFE membrane comprising:

  • forming an extruded lubricated tape of PTFE polymer by a paste forming process;

    stretching the extruded lubricated tape transversely at a ratio of at least 3;

    1, and drying the stretched tape to remove lubricant;

    longitudinally expanding the resulting tape at a temperature above 327°

    C.;

    then transversely expanding the tape at a temperature above 327°

    C.

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