POROUS FILM

PROBLEM TO BE SOLVED: To provide a porous film stretched with a high magnification by extrusion-molding without using a solvent a high molecular weight polyolefin resin hard to extrusion-mold, and a manufacturing method thereof. SOLUTION: The porous polyolefin film is obtained by tandem extrusion co...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	KAWAZOE SHINYA, AKASHI KAZUO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS 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
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a porous film stretched with a high magnification by extrusion-molding without using a solvent a high molecular weight polyolefin resin hard to extrusion-mold, and a manufacturing method thereof. SOLUTION: The porous polyolefin film is obtained by tandem extrusion comprising melt-kneading by a twin-screw extruder a resin composition comprising a polyolefin having a viscosity-average molecular weight of at least 300,000 with a non-reactive gas, removing a part of the non-reactive gas before the resin composition solidifies, subsequently feeding the resin composition into a single-screw extruder, removing the whole quantity of the non-reactive gas in the single-screw extruder and extruding a dense resin composition and subjecting the thus-obtained dense resin composition to a treatment for forming a porous structure. The manufacturing method of the porous polyolefin film is also provided.