PRODUCTION OF POROUS FILM

PROBLEM TO BE SOLVED: To provide a method for producing a porous film which is high in strength and low in heat shrinkage and is applicable to a separator for a secondary cell. SOLUTION: In a method for producing a porous film in which a polyolefin resin containing an ultra-high molecular weight pol...

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Bibliographische Detailangaben
Hauptverfasser:	NOMI TOSHISUKE, OIZUMI SHINICHI, YAMAMOTO KAZUNARI, ICHIKAWA TOMOAKI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BASIC ELECTRIC ELEMENTS CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELECTRICITY GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for producing a porous film which is high in strength and low in heat shrinkage and is applicable to a separator for a secondary cell. SOLUTION: In a method for producing a porous film in which a polyolefin resin containing an ultra-high molecular weight polyolefin resin is heated in a solvent, dissolved, kneaded, molded into gelatinous sheet 0.5-20 mm in thickness, rolled, stretched biaxially, and desolvated, a total draw ratio defined by the product of a roll ratio and a draw ratio is adjusted at 50-400 in terms of an area ratio, and the ratio of roll ratio/draw ratio is adjusted at 1-15.