Magnetic recording medium wherein the magnetic layer contains co

Details Magnetic recording medium wherein the magnetic layer contains co Magnetic recording medium wherein the magnetic layer contains co

1990-03-28

1991-11-19

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428694, 428402, G11B 2300

Patent

active

050665391

ABSTRACT:
A magnetic recording medium improved in electromagnetic conversion characteristics and runnability is disclosed. The magnetic recording medium is formed by coating a non-magnetic substrate with a magnetic layer. The magnetic layer contains a fine ferromagnetic powder having a specific surface area larger than 45 m.sup.2 /g, a binder having polar groups such as --SO.sub.3 M and --OSO.sub.3 M in the molecule in an amount of 0.2 to 0.8 .mu.mol per m.sup.2 of the specific surface area of the ferromagnetic powder, and a compound having 2 or more carboxylic groups in an amount of 0.5 to 5.0 .mu.mol per m.sup.2 of the specific surrface of the ferromagnetic powder. The magnetic layer is further incorporated with a carbon powder having a mean diameter of 200 to 400 nm and a specific surface area of 5 to 20 m.sup.2 /g to improve the runnability of the magnetic recording medium while keeping the improved magnetic characteristics.

REFERENCES:
patent: 4521486 (1985-06-01), Ninomiya et al.
patent: 4835049 (1989-05-01), Ishiguro et al.
patent: 4885208 (1989-12-01), Akari et al.

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