MAGNETIC RECORDING MEDIUM

PURPOSE:To reduce the coefft. of friction of a back layer, to improve the running stability, and to enhance the running durability of a magnetic layer by forming the back layer contg. inorg. powder on one side of a polymer support having a ferromagnetic thin metallic film on the other side as the ma...

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Hauptverfasser:	SHIRAHATA RIYUUJI, ANDOU YUUJI, NISHIKAWA YASUROU
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES FUELS INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS LUBRICANTS LUBRICATING COMPOSITIONS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PEAT PETROLEUM, GAS OR COKE INDUSTRIES PHYSICS POLISHES TECHNICAL GASES CONTAINING CARBON MONOXIDE USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PURPOSE:To reduce the coefft. of friction of a back layer, to improve the running stability, and to enhance the running durability of a magnetic layer by forming the back layer contg. inorg. powder on one side of a polymer support having a ferromagnetic thin metallic film on the other side as the magnetic layer. CONSTITUTION:A thin film of a ferromagnetic metal such as Co or Ni or a ferromagnetic alloy is formed on one side of a polymer support by vacuum deposition or other method. A back layer contg. inorg. powder of MoS2, SiO2, CaCO3 or the like having 0.02-0.5mum average particle size and >=2.5 Mohs' hardness, a binder and an adequate amount of a lubricant such as fatty acid, fatty acid amide or higher alcohol is formed on the other side of the support. The preferred binder is synthetic resin having >=40 deg.C glass transition point. The coefft. of friction of the back layer is reduced, the running stability is improved, and the running durability of the magnetic layer is enhanced.