Magnetic recording media having a low coefficient of friction

Details Magnetic recording media having a low coefficient of friction Magnetic recording media having a low coefficient of friction

1976-03-08

1978-02-14

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

252 6254, 360134, 427128, 428539, 428900, H01F 1002

Patent

active

040740021

ABSTRACT:
Magnetic recording media comprising a base and, applied thereto, at least one firmly adhering magnetic layer based on magnetic particles dispersed in a mixture of organic binders, wherein at least the uppermost magnetic layer additionally contains non-magnetic particles of precipitated silica having a primary particle diameter of from 0.02 to 0.1.mu., a secondary particle diameter of from 2 to 4.mu. and a pH of from 5 to 8.
As a result of the incorporation of such a precipitated silica into the magnetic layer, the coefficient of friction between the latter and metals remains uniformly low even after prolonged use, and no stick-slip motion occurs.

REFERENCES:
patent: 3687725 (1972-08-01), Hartmann et al.
patent: 3833412 (1974-09-01), Akashi et al.
patent: 3843404 (1974-10-01), Haefele et al.

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