METHOD FOR PRODUCING MICROPOROUS POLYOLEFIN MEMBRANE AND MICROPOROUS MEMBRANE
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United States of America Patent
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Issued Date -
Jan 8, 2009
app pub date -
Mar 28, 2006
filing date -
Mar 29, 2005
priority date (Note) -
Abandoned
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Abstract
A microporous polyolefin membrane having excellent compression resistance is obtained by stretching a gel molding comprising a polyolefin and a membrane-forming solvent, removing the membrane-forming solvent, and stretching the resultant membrane again at least uniaxially at a speed of 3%/second or more at a temperature equal to or lower than the crystal dispersion temperature +20° C.
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