Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1984-03-07

1985-10-01

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, 428323, 428336, 428403, 428407, 428694, 428695, 428900, 428408, G11B 572

Patent

active

045446016

ABSTRACT:
A magnetic recording medium is disclosed. The medium is comprised of a non-magnetic support having coated thereon a magnetic recording layer and a backing layer on the surface opposite the magnetic recording layer. The backing layer contains carbon black and the surface treated calcium carbonate dispersed in a binder. The calcium carbonate is surface treated so as to make the particles hydrophobic. Including the carbon black and the calcium carbonate in the backing layer provides a recording medium with improved durability and a reduced amount of drop out.

REFERENCES:
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patent: 4135031 (1979-01-01), Akashi
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patent: 4200565 (1980-04-01), Naughton
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patent: 4367261 (1983-01-01), Miyoshi
patent: 4414270 (1983-11-01), Miyoshi
patent: 4418163 (1983-11-01), Murakami
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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