Process for producing magnetic powder and product
AssigneeIshihara Sangyo Kaisha, Ltd.
InventorsKazuo Nakata, Masatsuyo Maruo, Kiyoshi Asano
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Abstract
A process for producing a magnetic powder which comprises coating the particle surfaces of a magnetic iron oxide with a cobalt compound or a cobalt compound and a ferrous compound and further coating with a compound of at least one metal selected from the group consisting of manganese, vanadium and zinc. There is obtained a magnetic powder having high coercivity and excellent dispersibility in organic binders. This magnetic powder is useful as a material for recording media such as magnetic tapes.
Claims21
A process for producing a magnetic powder which comprises the two steps of first coating the particle surfaces of a magnetic iron oxide with a cobalt compound or a cobalt compound and a ferrous compound and subsequently coating the cobalt compound or cobalt and ferrous compounds-coated surfaces with a compound of at least one metal selected from the group consisting of manganese, vanadium and zinc under a non-oxidizing atmosphere.
Dependencies are inferred from the claim text.