MAGNETIC RECORDING MEDIUM

• Main Authors: KUDO MASUO, UEDA YUKIHIRO
• Format: Patent
• Language: English
• Published: 13.07.1993
• Subjects: 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

PURPOSE:To provide a magnetic recording medium having an excellent lubricity and durability by incorporating a metallic salt of fatty acid and carbon black having a specific average single particle diameter in a magnetic layer. CONSTITUTION:The metallic salts of 12-18C higher fatty acids such as Zn stearate, Ba stearate, Ca stearate, and Al, oleic acid are used 3-15 pts.wt. for 100 pts.wt. of magnetic powder. Also the average single particle diameter of the carbon black is 0.2-1.0mum, and is preferably in a range of 3-1.0mum and the carbon black is used 3-15 pts.wt. for 100 pts.wt. of the magnetic powder. The magnetic powder is an acicular fine gamma-Fe2O3, or a Co doped gamma-Fe2O3, etc., and as the binder polyurethane and polyvinyl chloride, etc., are used and 15-60 pts.wt. of it are used for 100 pts.wt. of the magnetic powder. The mixture is applied on e.g. a substrate of polyethylene terephthalate.