MICROPOROUS MEMBRANE, METHOD FOR PRODUCING SAME, AND BATTERY SEPARATOR USING SAME
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United States of America Patent
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Issued Date -
Nov 14, 2013
app pub date -
Jan 17, 2012
filing date -
Jan 25, 2011
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Abandoned
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Abstract
The present invention is a microporous membrane comprising polymethylpentene (a), polyethylene (b), and polypropylene (c), the microporous membrane having a meltdown temperature of 180° C. or higher, a TD heat shrinkage at 170° C. of 35% or less, and a thickness change ratio per thickness of 10% or less.
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