Magnetic recording medium comprising a magnetic layer and a back

Details Magnetic recording medium comprising a magnetic layer and a back Magnetic recording medium comprising a magnetic layer and a back

1990-09-10

1992-09-15

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

4284242, 4284259, 428694, 428900, 428522, G11B 500

Patent

active

051477203

ABSTRACT:
A magnetic recording medium is disclosed which comprises a support and, provided thereon, a magnetic layer containing a binder and a back coat layer containing carbon black on the side opposite to the magnetic layer. The magnetic layer contains a copolymer comprising a unit derived from vinyl monomer having sulfonic acid salt group and a unit derived from vinyl carboxylic acid ester having a hydroxyl group, the back coat layer has Ra, an average surface roughness of from 0.010 to 0.035 .mu.m, and not less than 70% by weight of the carbon black has an average particle diameter of from 10 to 30 .mu.m.

REFERENCES:
patent: 4582757 (1986-04-01), Miyoshi et al.
patent: 4900631 (1990-02-01), Yamakawa

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