Hard disk magnetic recording medium comprising magnetic powder a

Details Hard disk magnetic recording medium comprising magnetic powder a Hard disk magnetic recording medium comprising magnetic powder a

1989-01-03

1993-01-19

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428336, 428694, 428900, G11B 0500

Patent

active

051806169

ABSTRACT:
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.

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patent: 4880666 (1989-11-01), Ito et al.
patent: 4895758 (1990-01-01), Savemoto et al.
patent: 4918556 (1990-04-01), Ezaki et al.

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