BATTERY SEPARATOR POROUS FILM

PROBLEM TO BE SOLVED: To provide battery separator porous films high in piercing strength while having a high porosity and, in addition, low in the shutdown temperature. SOLUTION: Battery separator porous films are composed of a resin composition comprising (a) 50-90 wt.% polyolefin resin compositio...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAGUCHI MUTSUKO, UETANI YOSHIHIRO, NOMI TOSHISUKE, YAMAMOTO KAZUNARI, ICHIKAWA TOMOAKI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOSITIONS BASED THEREON ELECTRICITY GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide battery separator porous films high in piercing strength while having a high porosity and, in addition, low in the shutdown temperature. SOLUTION: Battery separator porous films are composed of a resin composition comprising (a) 50-90 wt.% polyolefin resin composition containing not less than 1 wt.% ultra-high-molecular-weight polyolefin resin having a weight average molecular weight of not smaller than 1×106, (b) 5-15 wt.% saturated thermoplastic elastomer composed of a copolymer of 70-90 wt.% at least one block selected from an ethylene block, a hydrogenated butadiene block, and a hydrogenated isoprene block, and 10-30 wt.% a styrene block and having a weight average molecular weight of 1×104-2×105, and (c) 5-35 wt.% polyolefin thermoplastic elastomer having a peak temperature by a differential scanning calorimeter of 80-150 deg.C and a melt flow rate(MFR) at 190 deg.C under a load of 2.16 kg of not greater than 10 g/10 min.