Magnetic recording medium, comprising magnetic powder and a sulf

Details Magnetic recording medium, comprising magnetic powder and a sulf Magnetic recording medium, comprising magnetic powder and a sulf

1992-02-11

1994-05-31

Resan, Stevan A.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428694B, 428900, G11B 500

Patent

active

053168623

ABSTRACT:
The present invention provides a magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed on a substrate, comprising (a) a binder containing a vinyl chloride resin having sulfoxide groups and (b) a magnetic powder dispersed in the binder (a); and a binder used in said medium for dispersion of magnetic powder, containing a vinyl chloride resin containing sulfoxide groups. The present invention further provides a process for producing said vinyl chloride resin (a binder resin) having sulfoxide groups. The use of the binder resin of the present invention makes it possible to obtain a magnetic coating in which a fine magnetic powder is dispersed stably and which has good coatability. The magnetic recording medium obtained using the magnetic coating has good surface smoothness and good surface durability and is excellent in travelling, magnetic property and electromagnetic conversion property.

REFERENCES:
patent: 4734330 (1988-03-01), Oiyama et al.
patent: 4743501 (1988-05-01), Eguchi et al.

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