Microporous Membrane
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United States of America Patent
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Issued Date -
Nov 13, 2014
app pub date -
Sep 26, 2012
filing date -
Sep 26, 2011
priority date (Note) -
Abandoned
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Abstract
A microporous membrane having a polyolefin microporous membrane and a surfactant adhering to the polyolefin microporous membrane, wherein the surfactant includes a surfactant (A) having a solubility in 100 g of water of 5 g or more and a surfactant (B) having a solubility in 100 g of water of less than 0.1 g, the surfactants (A) and (B) are adhered in an amount of 1 to 40% by mass in total based on 100% by mass of the polyolefin microporous membrane, and the polyolefin microporous membrane has a tortuosity factor of more than 2.0.
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