Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-08-09

1986-04-15

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

360134, 360135, 360136, 427128, 427131, 428329, 428330, 428408, 428694, 428900, G11B 572

Patent

active

045827575

ABSTRACT:
A magnetic recording medium which comprises a non-magnetic support having on the surface side thereof a magnetic recording layer and on the opposite side thereof a backing layer having a thickness of 2 .mu.m or less, which contains carbon black and a binder and optionally, an inorganic powder, in which the backing layer contains at least two kinds of carbon black, one being fine-grained carbon black having a mean grain size of 10 to 30 m.mu. and the other being coarse-grained carbon black having a mean grain size of 150 to 500 m.mu. such that the weight ratio (P/B) of the total amount of carbon black and inorganic powder (P) to binder (B) is from about 1/0.5 to 1/3.5. The recording medium described provided smooth and stable tape-running for an extended period and a high S/N ratio.

REFERENCES:
patent: 4135031 (1979-01-01), Akashi
patent: 4310599 (1982-01-01), Akashi
patent: 4414270 (1983-11-01), Miyoshi
patent: 4419406 (1983-12-01), Isobe
patent: 4451531 (1984-05-01), Isobe
patent: 4452863 (1984-06-01), Takizawa
patent: 4474843 (1984-10-01), Miyoshi

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