Magnetic recording composition and article coated therewith

Details Magnetic recording composition and article coated therewith Magnetic recording composition and article coated therewith

1979-04-27

1981-06-23

Pianalto, Bernard D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

252 6254, 252 6256, 428339, 428900, 428694, C04B 3504

Patent

active

042751152

ABSTRACT:
A magnetic recording composition comprising a non-aqueous dispersion, in liquid dispersion medium, of a dispersed solid phase of a major proportion of magnetic powder and minor proportions of at least two types of non-magnetic powder. One type of the non-magnetic powder has a Mohs' hardness of greater than 7, inclusive, and is contained in an amount of from 1 to 5 wt% of the magnetic powder. The other type of the non-magnetic powder has a Mohs' hardness of smaller than 7 but greater than about 3 and is contained in an amount of from 1 to 15 wt% of the magnetic powder. Either one type or the other type of the non-magnetic powder can be composed of two different kinds of non-magnetic materials whose total amount should be within the above-recited range.

REFERENCES:
patent: 3687725 (1972-08-01), Hartmann

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