MAGNETIC RECORDING MEDIUM CONSISTING OF THIN METALLIC FILM AND ITS PRODUCTION

• Main Authors: ABE YUZO, ONISHI YOSHIHISA, TAKAHASHI SEIICHIRO, MATSUURA KOTARO, MIWA KAZUNORI
• Format: Patent
• Language: English
• Published: 30.10.1986
• 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 improve the wear resistance, durability and runnability of a recording medium consisting of a thin ferromagnetic metallic film by forming a protective layer consisting of the specific single protective paint on the surface of the thin ferromagnetic metallic film formed by a vapor deposition method, etc. on a film base. CONSTITUTION:The long-chain alkyl pendant type polymer expressed by the formula (R1, R2, denote the alkyl group of 16-24C, X denotes an ester group or ether group) is coated to <=500Angstrom thickness on the surface of the thin ferromagnetic metallic film formed on the film base. The polymer is dissolved at 0.001-10vol% to prepare the protective paint and such paint is coated on the surface of the thin metallic film in this stage. The coated film is improved in the wear resistance and runnability by the suitable film thickness of the long-chain alkyl pendant type polymer film obtd. from the coating concn. and the lubricating effect possessed by the long-chain alkyl group; at the same time the contact angle of the magnetic layer with water is increased by the hydrophobic property possessed by the long-chain alkyl gruop. The intrusion of water which is the case for rust is thus prevented and the corrosion resistance is improved.