PRODUCING METHOD FOR POROUS FILM

PROBLEM TO BE SOLVED: To provide a producing method for a porous film, in which void content and air permeability are moderate and mechanical strength is high and furthermore working efficiency of rolling is increased. SOLUTION: In the producing method for the porous film, a mixture consisting of a...

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Bibliographische Detailangaben
Hauptverfasser:	OIZUMI SHINICHI, 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 ELECTRICITY GENERAL PROCESSES OF COMPOUNDING 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 producing method for a porous film, in which void content and air permeability are moderate and mechanical strength is high and furthermore working efficiency of rolling is increased. SOLUTION: In the producing method for the porous film, a mixture consisting of a polyolefin composition and a solvent is melted and kneaded and the obtained molten kneaded material is extruded into a sheet shape and thereafter the same is cooled and the obtained sheetlike molded material is rolled. Two or more sheets of sheetlike molded material are overlapped and rolled by using a double belt press.