POLYETHYLENE MULTILAYER MICROPOROUS MEMBRANE, BATTERY SEPARATOR USING SAME, AND BATTERY

Title:

POLYETHYLENE MULTILAYER MICROPOROUS MEMBRANE, BATTERY SEPARATOR USING SAME, AND BATTERY

Document Type and Number:

WIPO Patent Application WO/2007/023918

Kind Code:

A1

Abstract:

Disclosed is a polyethylene multilayer microporous membrane comprising a first porous layer (a) composed of a polyethylene resin and a second porous layer (b) containing a polyethylene resin and a heat-resistant resin having a melting point or glass transition temperature of not less than 170˚C. In the second porous layer (b), the heat-resistant resin is dispersed in the polyethylene resin in the form of particles, and fibrils of the polyethylene resin are cleaved by using the heat-resistant resin particles as nuclei, thereby forming pores. Such a polyethylene multilayer microporous membrane has a good balance among shutdown characteristics, meltdown characteristics, permeability, mechanical strength, thermal shrinkage resistance and compression resistance.

Inventors:

KIKUCHI SHINTARO (JP)
TAKITA KOTARO (JP)

Application Number:

PCT/JP2006/316645

Publication Date:

March 01, 2007

Filing Date:

August 24, 2006

Export Citation:

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Assignee:

TONEN SEKIYUKAGAKU KK (JP)
KIKUCHI SHINTARO (JP)
TAKITA KOTARO (JP)

International Classes:

B32B27/32; B32B5/32; H01M50/417; H01M50/42; H01M50/423; H01M50/426; H01M50/429; H01M50/491; H01M50/494

Domestic Patent References:

WO2000020492A1	2000-04-13
WO1999048959A1	1999-09-30

Foreign References:

JPH11317212A	1999-11-16
JP2001162741A	2001-06-19
JPH06240036A	1994-08-30
JP2003105123A	2003-04-09
JPH06182918A	1994-07-05
JP2004161899A	2004-06-10
JP2004149637A	2004-05-27
JP3235669B2	2001-12-04
JP3422496B2	2003-06-30
JP2883726B2	1999-04-19
JPH11329390A	1999-11-30
JP2002321323A	2002-11-05
JP2004149637A	2004-05-27
JP2004161899A	2004-06-10
JP3347854B2	2002-11-20

Other References: