Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1988-12-19

1990-11-06

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428329, 428408, 4284259, 428694, 428900, G11B 2300

Patent

active

049685570

ABSTRACT:
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic alloy particles, fine particles of metal oxides and carbon black dispersed in a binder. The ferromagnetic alloy particles have a pH of from 4.5 to 7.5. The carbon black has a pH in a range of from 6.5 to 10.5. At least one kind of fine particles of metal oxides have Mohs' hardness of 5 or higher and pH of at least 3.5 but less than 7.5 and at least one kind of fine particles of metal oxides have Mohs' hardness of 5 or higher and a pH of from 7.5 to 10.5. The binder contains a polymer having at least one kind of an acidic polar group selected from the group consisting of a phosphate group, a phosphoric acid group, a sulfonic acid group, a carboxylic acid group, a metal salt of phosphoric acid group, a metal salt of sulfonic acid group, and a metal salt of carboxylic acid group.

REFERENCES:
patent: 4634633 (1987-01-01), Ninomiya et al.
patent: 4895758 (1990-01-01), Sakemoto et al.

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