PRODUCTION OF MAGNETIC RECORDING MEDIUM

PURPOSE:To improve the strength of a coated film by coating a coating compd. prepd. by mixing magnetic metallic powder and thermosetting resin on a nonmagnetic substrate to form the coated film and baking and curing the coated film in hydrogen or inert gas contg. hydrogen. CONSTITUTION:The coating c...

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Bibliographische Detailangaben
Hauptverfasser:	NAGASHIRO KAZUICHI, AKAGI MOTOO, MATSUYAMA IWAO
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PHYSICS POLISHES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PURPOSE:To improve the strength of a coated film by coating a coating compd. prepd. by mixing magnetic metallic powder and thermosetting resin on a nonmagnetic substrate to form the coated film and baking and curing the coated film in hydrogen or inert gas contg. hydrogen. CONSTITUTION:The coating compd. consisting of 36pts.wt. epoxy resin, 36pts.wt. phenolic resin, 10pts.wt. polyvinyl butyral resin, and 600pts.wt. solvent per 100pts. wt. iron powder is thinly and uniformly coated on the substrate consisting of an aluminum disk to form a magnetic film. After the magnetic film is subjected to an orientation treatment, the film is baked and cured for 2hr in a 150-280 deg.C range in a gaseous atmosphere formed by mixing 1% hydrogen with gaseous N2. A method for thermal curing without oxidizing the magnetic metallic powder is exemplified by a method for thermal curing in hydrogen, hydrogen-contg. nitrogen or inert gas. The cured film having the substantial strength of the coated film is thus formed.