Method of preparing a polyethylene microporous film for a rechargeable battery separator
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United States of America Patent
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Jan 8, 2013
Grant Date -
Jun 24, 2010
app pub date -
Jan 15, 2010
filing date -
Dec 23, 2004
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Abstract
Disclosed are a polyethylene microporous film and a method of preparing the same. The polyethylene microporous film, which has a laminated structure comprising B layer/A layer/B layer, prepared by melt-mixing a polyethylene and an aliphatic hydrocarbon solvent together at controlled mixing ratios to separately form an A layer and a B layer having different porosities, and then coextruding the A and B layers, thus exhibiting excellent mechanical properties, such as strength and elongation, and high-temperature stability. Therefore, the polyethylene microporous film is suitable for use in a rechargeable battery separator.
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