Hitachi, Ltd.

Hitoshi Inoue

Naoki Kodama

Yasutaro Uesaka

Iwao Matsuyama

Hajime Fukke

Masayuki Katsumoto

Heigo Ishihara

Motoo Akagi

Katsuyoshi Chiba

Yoshiharu Terada

A method for manufacturing a magnetic paint by mixing a resin composition powder as a dispersing binder for a magnetic powder with the magnetic powder, or together with a filler, and grinding the mixture under a high shear stress is disclosed. A magnetic recording medium such as a magnetic disk, etc., prepared by using the magnetic paint, can have a magnetic coating film having a substantially uniform film thickness of not more than 0.9 .mu.m and a surface roughness of not more than 0.05 .mu.m Ra before surface finishing.

Hard disk magnetic recording medium comprising magnetic powder and a

A coating type, magnetic disk is produced by applying a magnetic paint containing magnetic powders in a dispersed state to a non-magnetic substrate, thereby forming a magnetic recording film thereon, and applying surface waves to the magnetic recording film in an undried state. By applying the surface waves to the magnetic recording film, dispersibility and orientation of the magnetic powders are improved and a longitudinally oriented, coating type magnetic disk with distinguished electromagnetic properties, such as a high S/N ratio, etc. can be obtained.

Process for producing a rigid magnetic disk by longitudinally generating

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Kokubunji, Japan

Hitoshi Inoue