Magnetic recording medium containing ferromagnetic metal powder

Details Magnetic recording medium containing ferromagnetic metal powder Magnetic recording medium containing ferromagnetic metal powder

1990-01-18

1991-09-03

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428694, 428900, 428695, 428402, G11B 2300

Patent

active

050453726

ABSTRACT:
A magnetic recording medium having on a non-magnetic support a magnetic layer mainly composed of a ferromagnetic metal powder and a binder resin is disclosed, wherein the specific surface area S (m.sup.2 /g) of the ferromagnetic metal powder is from 30 to 65 and the magnetic layer further contains a fatty acid ester in a content Y (% by weight) to the ferromagnetic metal powder of the range of 0.05S+5.5.ltoreq.Y.ltoreq.-0.2S+24 when the specific surface area S is from 30 to less than 50 and the range of 0.06S+4.7.ltoreq.Y.ltoreq.-0.13S+21 when the specific surface area S is from 50 to 65. The magnetic recording medium is suitable for high density recording and exhibits excellent running durability.

REFERENCES:
patent: 4652500 (1987-03-01), Ejiri et al.
patent: 4675250 (1987-06-01), Kanai et al.
patent: 4772522 (1988-09-01), Kubota et al.
patent: 4786551 (1988-11-01), Ootani et al.

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