Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1988-05-27

1990-10-23

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

427131, 428323, 428329, 428336, 428408, 428694, 428900, G11B 2300

Patent

active

049651200

ABSTRACT:
A magnetic recording medium is described, comprising a nonmagnetic support having thereon a first magnetic layer and having on the first magnetic layer a second magnetic layer, in that order, said second magnetic layer comprising a magnetic particle, a binder, abrasive particles and carbon black having an average primary particle diameter of 80 m.mu. or more, said first magnetic layer comprising a magnetic particle, a binder and carbon black having an average primary particle diameter of 40 m.mu. or less without substantially containing abrasive particles in the first magnetic layer, and the thickness ratio of the first layer to the second layer, first layer thickness/second layer thickness is 1.8 or more.

REFERENCES:
patent: 4259392 (1981-03-01), Suzuki
patent: 4511617 (1985-04-01), Hideyama et al.
patent: 4546038 (1985-10-01), Yamaguchi et al.

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