Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1974-12-23
1977-03-29
McCamish, Marion E.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428328, 428329, 428331, 428404, 428900, B32B 516
Patent
active
040150429
ABSTRACT:
Magnetic recording elements comprising a magnetic layer containing dispersed particles which improve the wear resistance of the layer are disclosed. Such elements comprise a non-magnetic support and a magnetic recording layer that contains dispersed in a binder, ferromagnetic particles for recording and non-ferromagnetic particles of different average particle size. These non-ferromagnetic particles of different particle size have a Mohs Hardness above that of the ferromagnetic particles. These non-ferromagnetic particles consist essentially of (a) particles having an average particle size similar to or larger than that of the ferromagnetic particles, of about 0.3 to about 2 microns, present at a concentration of about 0.005 to about 0.025 parts, by weight, based on the weight of the ferromagnetic particles, and (b) smaller particles having an average particle size up to about 0.1 micron, present at a concentration of about 0.02 to about 0.06 parts, by weight, based on the weight of the ferromagnetic particles. Suitable ferromagnetic particles include acicular iron oxides, chromium dioxide and the like. The magnetic recording elements disclosed herein, particularly the magnetic tapes, exhibit high resistance to wear and tear and low abrasiveness.
REFERENCES:
patent: 3190197 (1965-06-01), Pinder
patent: 3622386 (1971-11-01), Larsen
patent: 3687725 (1972-08-01), Hartmann et al.
patent: 3833412 (1974-09-01), Akashi et al.
patent: 3843404 (1974-10-01), Haefele et al.
Friedman et al., "Lubricants for Magnetic Recording Media," IBM Tech. Disclosure Bulletin, vol. 9, No. 7, p. 779, Dec. 1966.
The Condensed Chemical Dictionary, 5th Ed., Reinhold Publishing Corp., N.Y., 1956, pp. 1060 and 1061.
Eastman Kodak Company
McCamish Marion E.
Wiese B. D.
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