Method of forming microporous membranes
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United States of America Patent
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Feb 14, 2006
Grant Date -
Feb 3, 2005
app pub date -
Jul 29, 2003
filing date -
Jul 29, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of forming a microporous fluoropolymer membrane, comprising the steps of: irradiating a sheet of fluoropolymer at a dosage level below the rupture energy of the carbon-to-fluorine (C—F) bonds of the fluoropolymer, but sufficient to rupture carbon-to-carbon (C—C) bonds; and exposing the sheet of fluoropolymer to an etchant for a period of time sufficient to etch away disrupted atoms and molecules, wherein continuous micropassages are formed through the sheet.
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