POLYPROPYLENE FILM FOR CAPACITOR, METHOD FOR PRODUCING THE SAME, AND METALLIZED FILM

PROBLEM TO BE SOLVED: To provide a biaxially oriented polypropylene film for an ultrathin capacitor that has a small reduction in capacitance even when high dc voltage is continuously charged for a long period of time under high temperature and has excellent long-term heat resistance and voltage res...

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Bibliographische Detailangaben
Hauptverfasser:	MATSUO YOSHINOBU, ISHIWATARI TADAKAZU
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 CAPACITORS CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELECTRICITY 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 MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS 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 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:	PROBLEM TO BE SOLVED: To provide a biaxially oriented polypropylene film for an ultrathin capacitor that has a small reduction in capacitance even when high dc voltage is continuously charged for a long period of time under high temperature and has excellent long-term heat resistance and voltage resistance performance, and a metallized polypropylene film for the capacitor. SOLUTION: The biaxially oriented polypropylene film for a capacitor has a weight-average molecular weight (Mw) measured by GPC method of 250,000-450,000, molecular weight distribution (Mw/Mn) of 4-7, and the difference obtained by subtracting a differentiation distribution value at a logarithm molecular weight Log(M)=6 from a differentiation distribution value at Log(M)=4.5 of 2-15% on a molecular weight distribution curve, and contains at least one hindered phenol-based antioxidant having a carbonyl group in an amount of 4,000-6,000 ppm (mass basis). COPYRIGHT: (C)2011,JPO&INPIT