Method for manufacturing microporous film and microporous film

The present invention provides a method for producing a microporous film, including: preparing a resin composition containing polypropylene (PP) as a resin component and containing from 0.01 to 20 parts by weight of a chemically modified cellulose or chemically modified cellulose nanofiber per 100 p...

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Bibliographische Detailangaben
Hauptverfasser:	Ishiguro, Ryou, Yoshioka, Mariko, Nakamura, Satoru
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 USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention provides a method for producing a microporous film, including: preparing a resin composition containing polypropylene (PP) as a resin component and containing from 0.01 to 20 parts by weight of a chemically modified cellulose or chemically modified cellulose nanofiber per 100 parts by weight of the resin component and from 0.01 to 3 parts by weight of a β-crystal nucleating agent per 100 parts by weight of the resin component; melt-molding the resin composition into a film-like material in which the crystal phase of a polypropylene component in the resin composition is substantially a β-crystal phase, and subsequently stretching the film-like material at a temperature of 60 to 160° C., and provides a microporous film.