BIAXIALLY STRETCHED POLYPROPYLENE FILM

PURPOSE: To prepare polypropylene mono film which is free from adhesion and corrosion resistant during processing of the film and has small fall in capacity by substantially eliminating microfibers and sinking from the smooth surface, where the two surfaces of the film have different roughness from...

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Bibliographische Detailangaben
Hauptverfasser:	GERUHARUTO KOTSUHO, KAARUUHAINTSU MIYUURAA, PEETAA AIDEN, ROBERUTO SHIYUMITSUTO
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 CABLES CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CONDUCTORS ELECTRICITY GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INSULATORS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES 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:	PURPOSE: To prepare polypropylene mono film which is free from adhesion and corrosion resistant during processing of the film and has small fall in capacity by substantially eliminating microfibers and sinking from the smooth surface, where the two surfaces of the film have different roughness from each other. CONSTITUTION: In a biaxially stretched polypropylene mono film 1 made of pure polypropylene with an ash content less than 50 ppm, the film 1 has different roughness between the two surfaces 2, 3, and the average roughness of a smoother surface 3 is less than 0.25 μm, the average roughness of a coarser surface 2 is made at least 0.25 μm higher than the smoother surface. The smoother surface 3 is coated with a metal layer of 20-50 nm thickness. With the film 1 thickness of 8 μm and the metal layer thickness of 25 nm, when 50 Hz AC 500 V is applied to a capacitor made of the film 1 for 2000 hours at 85 deg.C, the decrease in the capacity of the capacitor after it is -5% at maximum.