COMPOSITE POROUS MEMBRANE, METHOD FOR PRODUCING COMPOSITE POROUS MEMBRANE AND BATTERY SEPARATOR USING SAME
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Aug 26, 2010
filing date -
Jun 25, 2010
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Abandoned
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Abstract
A composite porous membrane including a porous membrane A formed of a polyolefin-based resin; and a porous membrane B containing a heat-resistant resin and laminated on the porous membrane A, wherein the porous membrane A satisfies formulas (A) to (C), the composite porous membrane satisfies formula (D), and the composite porous membrane satisfies formulas (F) and (F) wherein thickness of porous membrane A<10 μm formula (A); 0.01 μm≦average pore diameter of porous membrane A≦1.0 μm formula (B); 30% porosity of porous membrane A≦70% formula (C); thickness of entire composite porous membrane≦13 μm formula (a); peel strength at interface between porous membrane A and porous membrane B≧1.0 N/25 mm formula (E); 20≦Y−X≦100 formula CO and wherein X is a gas permeation resistance (seconds/100 ccAir) of porous membrane A, and Y is a gas permeation resistance (seconds/100 ccAir) of the composite porous membrane.
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