Multilayer microporous membrane
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United States of America Patent
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Nov 28, 2006
Issued Date -
N/A
app pub date -
Jul 31, 2002
filing date -
Aug 1, 2001
priority date (Note) -
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Abstract
A multilayer microporous membrane containing a thermoplastic resin, comprising a coarse structure layer with a higher open pore ratio and a fine structure layer with a lower open pore ratio, wherein said coarse structure layer is present at least in one membrane surface having a thickness of not less than 5.0 .mu.m, a thickness of said fine structure layer is not less than 50% of the whole membrane thickness, and said coarse structure layer and said fine structure layer are formed in one-piece.
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