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Textured, porous, expanded PTFE

  • US 5,466,509 A
  • Filed: 01/15/1993
  • Issued: 11/14/1995
  • Est. Priority Date: 01/15/1993
  • Status: Expired due to Term
First Claim
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1. An expanded polytetrafluoroethylene sheet produced by the process of extruding a mixture of polytetrafluoroethylene and a lubricant into a sheet;

  • forming a pattern of defect sites in said sheet by one of impressing an external pattern into said sheet;

    high energy bombardment with solids, etching, laser irradiation and actinic irradiation;

    expanding said sheet; and

    sintering said sheet, whereby the expanded polytetrafluoroethylene sheet is characterized by having internodal distances non-uniformly distributed across the range of 10-200 microns.

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  • 4 Assignments
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