Magnetic recording media

Details Magnetic recording media Magnetic recording media

1977-07-28

1979-05-01

Pianalto, Bernard D.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428522, 428539, 428900, H01F 1002

Patent

active

041524845

ABSTRACT:
This invention relates to magnetic recording media comprising a non-magnetic base and a magnetic coating firmly bonded thereto, which coating consists essentially of a dispersion of a finely divided magnetic pigment in a polyurethane-containing mixture of binders. This binder mixture contains from 30 to 90% by weight of an elastomeric polyurethane which is virtually free from isocyanate groups and is soluble in a volatile organic solvent, and from 10 to 70% by weight of a vinyl chloride copolymer containing from 5 to 50% by weight of polymerized units of a monoester obtained from an aliphatic diol of from 2 to 4 carbon atoms and acrylic or methacrylic acid. Magnetic recording media having a magnetic coating containing this binder mixture are distinguished by advantageous mechanical and electrical properties, in particular by good abrasion resistance and improved packing density combined with better orientation of the magnetic particles.

REFERENCES:
patent: 3649541 (1972-03-01), Ingersoll
patent: 3690946 (1972-09-01), Hartmann et al.

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