SEPARATOR FOR ELECTROCHEMICAL DEVICE, ELECTROCHEMICAL DEVICE USING SAME, AND METHOD FOR PRODUCING THE SEPARATOR FOR ELECTROCHEMICAL DEVICE
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United States of America Patent
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Issued Date -
Dec 27, 2012
app pub date -
Mar 14, 2011
filing date -
Apr 16, 2010
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Abandoned
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Abstract
A separator for an electrochemical device of the present invention includes, on at least one side of a resin porous film including a thermoplastic resin as a main component, a heat-resistant porous layer including heat-resistant fine particles as a main component. The resin porous film has a surface tension (wetting index) A of 35 mN/m or less, the heat-resistant porous layer is made from a heat-resistant porous layer forming composition containing a water-based solvent and having a surface tension B of less than 29 mN/m, and a relationship between the surface tension (wetting index) A and the surface tension B satisfies A>B.
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