MAGNETIC RECORDING BODY

PURPOSE:To obtain a magnetic recording body with superior recording characteristics and durability by using a magnetic coating material prepared by dispersing surface treated ferromagnetic powder and a specified surfactant in a resin binder. CONSTITUTION:Ferromagnetic powder having about 0.3mum aver...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KATOU HIROHISA, OGUCHI TOSHIHIKO
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:PURPOSE:To obtain a magnetic recording body with superior recording characteristics and durability by using a magnetic coating material prepared by dispersing surface treated ferromagnetic powder and a specified surfactant in a resin binder. CONSTITUTION:Ferromagnetic powder having about 0.3mum average particle size is dispersed in a soln. of amino-functional silane in methanol to bond the silane to the powder surface, and by heat treating the powder, the powder surface is coated with an amino-fucntional silane layer. The amount of the silane dispersed in the soln. is about 0.1-10wt% of the amount of the powder, and the silane includes a compound represented by formulaI. The treated ferromagnetic powder is dispersed in a resin binder in the presence of a surfactant having >=12C alkyl group and >=1 kind of group selected from -COOH, -SO3H, groups represented by formulae II, III, etc. to prepare a magnetic coating material. The coating material is applied to a plastic film substrate and dried by a conventional method. Thus, a magnetic recording body is obtd.