PTFE material with aggregations of nodes
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United States of America Patent
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Dec 11, 2007
Grant Date -
Jul 14, 2005
app pub date -
Sep 20, 2004
filing date -
Aug 12, 1999
priority date (Note) -
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Abstract
A novel polytetrafluoroethylene (PTFE) material includes a plurality of aggregates connected together by a plurality of relatively long fibrils. Each of the aggregates are formed of PTFE nodes that are connected together by relatively short fibrils. Preferably, the long fibrils have lengths of 500 to 1000 microns and the short fibrils have a lengths of 10 to 30 microns. The aggregates have densities of less than 2.0 grams per cubic centimeter which is lower than the densities of the solid PTFE nodes which have densities of about 2.0 to 2.2 grams per cubic centimeter.
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