MAGNETIC RECORDING MEDIUM

• Main Authors: NINOMIYA YOSHINOBU, KIMURA SHIGEO
• Format: Patent
• Language: English
• Published: 28.10.1983
• 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 lubricity, by providing a lubricating layer on a coating film using a binder which has a polar group in the side chain of a molecular structure. CONSTITUTION:There are, for example, a vinyl chloride-vinyl acetate-vinyl alcohol copolymer, a polyester resin, a polyurethane resin, etc. as a compd. that has a polar group contg. an -OH group, -ONO2 group, etc. in the side chain thereof. A fatty acid or its derivative or phosphate is used as a lubricant. The compd. that has the polar group can be used in conjunction with a binder such as a thermplastic or thermosetting resin in either case of using the same for the magnetic layer or back coating layer. The result of the measurement made for the degree of durability and powder dislodging after aging with respect to the magnetic tape obtained in the above-mentioned way reveals that the good result is obtainable only if the binder having the polar group is incorporated at least at >=20wt%.