Verfahren zur Herstellung einer mehrschichtigen porösen Membran aus Polytetrafluoräthylen

A process for producing a multilayer polytetrafluoroethylene porous membrane comprising at least two layers (4,5,6) having different average pore diameters is disclosed, the process comprising the steps of: filling the inside of a cylinder (12) of an extruding mold distinctively with at least two ki...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAMOTO, KATSUTOSHI, SETTSU-SHI, OSAKA, JP, INOUE, OSAMU, MUKOU-SHI, KYOTO, JP, TANAKA, OSAMU, SUITA-SHI, OSAKA, JP, TAMARU, SHINJI, SUITA-SHI, OSAKA, JP, NISHIBAYASHI, HIROFUMI, SUITA-SHI, OSAKA, JP
Format:	Patent
Sprache:	ger
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 LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION 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:	A process for producing a multilayer polytetrafluoroethylene porous membrane comprising at least two layers (4,5,6) having different average pore diameters is disclosed, the process comprising the steps of: filling the inside of a cylinder (12) of an extruding mold distinctively with at least two kinds of polytetrafluoroethylene fine powders with each of which a liquid lubricant has been mixed; subsequently paste-extruding the powders to obtain a multilayer extrudate (15), which is then optionally rolled; and then stretching the extrudate or the rolled extrudate at least monoaxially after the liquid lubricant is removed therefrom or without removing the liquid lubricant.