Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1986-05-13

1988-03-15

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

427131, 428323, 428329, 428694, 428900, G11B 5706, G11B 5708

Patent

active

047312785

ABSTRACT:
A magnetic recording medium is described, comprising a magnetic layer containing ferromagnetic fine particles and a binder coated on one side of a non-magnetic support and a backing layer coated on the opposite side of the non-magnetic support, wherein said ferromagnetic fine particles have a cobalt content of from 2 to 10 wt % with respect to the iron oxide content thereof, the content of divalent iron (Fe.sup.2+) of from 1 to 10 wt % with respect to the trivalent iron (Fe.sup.3+) content thereof, and the specific surface area of from 30 to 50 m.sup.2 /g, said binder comprises a copolymer of vinyl chloride-vinyl acetate-maleic acid contained in an amount of 40 wt % or more with respect to the total binder content of the magnetic layer, an abrasive agent having a Mohs hardness of 6 or more is contained in said magnetic layer, and the resulting magnetic tape has a coercive force of from 750 to 900 Oe at 25.degree. C.

REFERENCES:
patent: 3953656 (1976-04-01), Tokuoka et al.
patent: 4455345 (1984-06-01), Miyatuka et al.
patent: 4465735 (1984-08-01), Togawa et al.
patent: 4503120 (1985-03-01), Yamauchi et al.
patent: 4539257 (1985-09-01), Ryoke et al.
patent: 4551386 (1985-11-01), Yamaguchi et al.
patent: 4598014 (1986-07-01), Miyoshi et al.

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