BIAXIALLY-ORIENTED POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM AND ITS PREPARATION

PURPOSE: To obtain a film having a good traveling property, scratching resistance and electromagnetic characteristics by incorporating specific ratios of spherical silica particles, calcium carbonate particles and alumina particles having prescribed grain sizes as a lubricant into the film at the ti...

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Bibliographische Detailangaben
Hauptverfasser:	KAN SHIYUNKI, RI EICHIN, U SHIYOUSHIYUU
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 COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 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 INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICS 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:	PURPOSE: To obtain a film having a good traveling property, scratching resistance and electromagnetic characteristics by incorporating specific ratios of spherical silica particles, calcium carbonate particles and alumina particles having prescribed grain sizes as a lubricant into the film at the time of producing the film. CONSTITUTION: The spherical silica particles having the average grain size of 0.1 to 2μm are incorporated at 0.01 to 1wt.%, the calcium carbonate having the average grain size of 0.1 to 3μm at 0.01 to 2wt.% and the alumina particles having the grain size of 0.1 to 1μm at 0.1 to 2wt.% of the weight of the polyester used at the time of producing the polyester film for magnetic recording media as the lubricant into the film. The polyester film for the magnetic recording medium having the improved traveling property, scratching resistance and electromagnetic characteristics is obtd.