Magnetic discs having metal support and a non-magnetic layer

Details Magnetic discs having metal support and a non-magnetic layer Magnetic discs having metal support and a non-magnetic layer

1973-11-09

1976-05-25

Pianalto, Bernard D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

427130, 427131, 428402, 428418, 428900, H01F 1000

Patent

active

039595536

ABSTRACT:
The invention relates to magnetic discs in which first a non-magnetic intermediate layer and then the magnetic coating are applied by conventional methods to an aluminum disc. The intermediate layer applied to the non-magnetic metallic carrier disc is a hard non-magnetic coating which can be polished and which consists of a dispersion of a pulverulent mixture of finely divided inorganic non-magnetic pigments having a Mohs' hardness of at least 7 in a binder which can be cured and which provides firm cohesion of the pigment particles and good adhesion thereof to the non-magnetic base disc, the pigment mixture containing at least 3 percent by weight of corundum powder having a particle size of from about 1 to 20.mu.u. Magnetic discs with very thin magnetic coatings which possess good magnetic and mechanical properties and whose thickness varies only minimally are thus produced in a simple manner.

REFERENCES:
patent: 2819186 (1958-01-01), Franck
patent: 3055770 (1962-09-01), Sankuer et al.
patent: 3681225 (1972-08-01), Genma et al.
patent: 3687725 (1972-08-01), Hartmann et al.
patent: 3733215 (1973-05-01), Paesschen et al.

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