MULTILAYER POROUS FILM, SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
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United States of America Patent
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Dec 31, 2015
app pub date -
Dec 25, 2014
filing date -
Jan 7, 2014
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Abstract
A multilayer porous film having, on at least one surface of a polyolefinic resin porous film, a coating layer that contains an alumina and a resin binder, wherein, when the alumina is heated at a heating rate of 10° C./min in thermogravimetric analysis, the mass of the alumina at 250° C. W250 and the mass thereof at 400° C. W400 satisfy the following relationship relative to the mass of the alumina at 25° C. W:
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