Magnetic recording medium with a back coat layer of nitrocellulo

Details Magnetic recording medium with a back coat layer of nitrocellulo Magnetic recording medium with a back coat layer of nitrocellulo

1990-08-30

1991-12-03

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428402, 4284251, 428694, 428900, G11B 2300

Patent

active

050699636

ABSTRACT:
A magnetic recording medium for use in a belt-driven cartridge is disclosed, which comprises a non-magnetic support provided a magnetic layer on the principal surface thereof and a back coat layer on the opposite surface thereof, wherein a back coat layer containing (a) a carbon black having a mean grain diameter of 20 to 100 nm; (b) a titanium oxide having a mean grain diameter of 100 to 600 nm; and (c) a binder consisting essentially of a pyroxylin and a polyurethane resin, provided that the weight proportion of component (a) to component (b) is in the range of 99:1 to 60:40, the weight proportion of the sum of component (a) and component (b) to component (c) is in the range of 70:30 to 20:80, and the weight proportion of the pyroxylin to the polyurethane resin in said component (c) is in the range of 10:90 to 90:10.

REFERENCES:
patent: 4612244 (1986-09-01), Kaneda et al.
patent: 4619868 (1986-10-01), Okita et al.

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