Highly air permeable expanded polytetrafluoroethylene membranes and process for making them
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United States of America Patent
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Feb 20, 1990
Grant Date -
N/A
app pub date -
Feb 2, 1989
filing date -
Feb 2, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thin, low density porous polytetrafluoroethylene membrane having very large pores and heretofore unknown high air permeabilities is described. The membrane is produced by a particular series of longitudinal and transverse stretching steps carried out under particular conditions.
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