Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1985-10-04

1988-07-19

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

427131, 428408, 428694, 428900, G11B 570

Patent

active

047584688

ABSTRACT:
The present invention relates to a magnetic recording medium which comprises a non-magnetic support having coated on opposite surfaces thereof a magnetic layer and a backing layer comprising a resin as a binder and non-magnetic particles, wherein the resin binder contains a polyurethane resin, a copolymer of vinylidene chloride and acrylonitrile, and a polyisocyanate compound; the non-magnetic particles contains fine carbon black having an average particle size of 30 to 150 m.mu. and coarse carbon black having an average particle size of 160 to 600 m.mu.; and the mixing weight ratio of the resin binder to the non-magnetic particles is within the range of 0.375:1 to 1:1 by weight. This magnetic recording medium has excellent electromagnetic properties and running durability.

REFERENCES:
patent: 4135031 (1979-01-01), Akashi et al.
patent: 4452863 (1984-06-01), Takizawa et al.
patent: 4474843 (1984-10-01), Miyoshi et al.
patent: 4546038 (1985-10-01), Yamaguchi et al.
patent: 4582757 (1986-04-01), Miyoshi et al.

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