Microporous, mixed polymer phase membrane
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United States of America Patent
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Issued Date -
Nov 27, 2003
app pub date -
May 16, 2003
filing date -
May 24, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A freestanding, microporous membrane includes a mixed polymer phase matrix having a first polymeric phase comprising a polyolefin interconnected with a second polymeric phase comprising a fibrillated fluoropolymer. A siliceous material is dispersed throughout the mixed polymer phase matrix. A method of forming the membrane of the present invention involves combining a siliceous material, a fluoropolymer capable of processing-induced fibrillation, and a polyolefin to form a mixture and subjecting the mixture to sufficient shear force during processing and extruding to effect fibrillation of the fluoropolymer and thereby form the interconnected mixed polymer phase matrix. The membrane is useful in a variety of products, including labels (printed and unprinted) and separators in energy storage devices, such as batteries, capacitors, and fuel cells.
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