BIAXIALLY ORIENTED POLYESTER FILM AS MAGNETIC RECORDING MEDIUM

PURPOSE:To obtain a polyester film as a magnetic recording medium, which is excellent in scratch resistance, fits for repeated use and meets the requirements for higher image quality, by a method wherein the surface roughness of at least one side of film and the height and number of projections per...

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Bibliographische Detailangaben
Hauptverfasser:	TSUCHIBUCHI MASANOBU, MOGI MASAHIKO, TSUCHIYA TAKESHI
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 polyester film as a magnetic recording medium, which is excellent in scratch resistance, fits for repeated use and meets the requirements for higher image quality, by a method wherein the surface roughness of at least one side of film and the height and number of projections per unit area of the surface of the film are provided. CONSTITUTION:The surface of the film concerned is set to have the center-like mean surface roughness Ra of 10-30nm and, at the same time, the three-dimensional mean surface roughness SRa of 15-55nm. If the surface roughness of film is smaller than the above-mentioned range, the frictional coefficient of the resultant film becomes larger and if the surface roughness of film is larger than the above-mentioned range, unsatisfactory image quality results. Further, the number of projections having the height of 200-400nm is set to be 1,100 or more per 0.1nm and the number of projections having the height of 400-600 is set to be 600 or less per 0.1nm . If the former is not more than 1,100, unsatisfactory usage durability results. If the latter is not less than 600, poor image quality results. The film concerned can be obtained by adding 0.01-1.5vol.% of inactive particle having the average particle diameter of 0.1-1.0mum.