MULTILAYER POROUS FILM, SEPARATOR FOR BATTERIES, AND BATTERY

WIPO Patent Application WO/2012/165580

A1

The present invention is capable of providing a multilayer porous film which has high adhesion between a base layer and a coating layer and excellent heat resistance and exhibits excellent characteristics when used as a separator for a nonaqueous electrolyte secondary battery. A multilayer porous film which is obtained by laminating a coating layer that contains a filler and a resin binder on at least one surface of a polyolefin resin porous film that serves as a base layer. The ratio of the average particle diameter (Du) of the filler within 25% of the thickness of the coating layer from the surface of the multilayer porous film to the average particle diameter (Db) of the filler within 25% of the thickness of the coating layer from the interface with the base layer, namely, Du/Db is 1.2-10; and the average particle diameter (Du) is 0.5 μm or less.

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YAMADA HIROTO (JP)
NEMOTO TOMOYUKI (JP)

PCT/JP2012/064168

December 06, 2012

May 31, 2012

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MITSUBISHI PLASTICS INC (JP)
YAMADA HIROTO (JP)
NEMOTO TOMOYUKI (JP)

B32B27/32; C08J7/043; C08J9/36; H01M10/052; H01M50/403; H01M50/449

WO2010008003A1

2010-01-21

JP2008186721A	2008-08-14
JP2004227972A	2004-08-12

OWADA, KAZUMI (JP)
Kazumi Owada (JP)

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