Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1977-04-26

1978-09-19

Edmundson, F.C.

Compositions

Magnetic

With wax, bitumen, resin, or gum

H01F 100, B23B 1500

Patent

active

041152905

ABSTRACT:
A magnetic recording medium is prepared by preparing a nitrocellulose-based magnetic composition by kneading a magnetic powder with a mixture of nitrocellulose in a solvent system containing isopropyl alcohol and blending the kneaded mixture with a polyurethane containing unreacted isocyanate groups; coating a substrate with the resulting magnetic composition and allowing the coated substrate to dry. The improvement comprises replacing substantial portions of the isopropyl alcohol from the group consisting of polyurethane resins, polybutadiene resins, butadiene-acrylonitrile copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, vinylidene chloride-acrylonitrile copolymers, vinyl acetate resins, epoxy resins, phenoxy resins, polyvinyl butyral resins, polyvinyl formal resins and polyester resins.

REFERENCES:
patent: 3810840 (1974-05-01), van Ruler et al.
patent: 3824128 (1974-07-01), Akashi et al.
patent: 4002804 (1977-01-01), Akashi et al.

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