Process for production of expanded polytetrafluoroetylene products
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United States of America Patent
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Apr 6, 2010
Grant Date -
Aug 4, 2005
app pub date -
May 1, 2003
filing date -
May 2, 2002
priority date (Note) -
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Abstract
Disclosed are expanded polytetrafluoroethylene products, such as porous polytetrafluoroethylene tubes, having high axial tear strength and a process for their production. Each expanded polytetrafluoroethylene product has a microstructure, which comprises fibrils and nodes interconnected with each other by the fibrils, and has an axial tear strength of not lower than 6,000 gf/mm as calculated in accordance with the following formula: L/[T×(V/100)] where L (gf) is an axial tear load, T (mm) is a wall thickness, and V (%) is a volume ratio of resin. The process for the production of the expanded polytetrafluoroethylene product includes a high-speed extrusion step.
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