Chromium dioxide material, its preparation and magnetic recordin

Details Chromium dioxide material, its preparation and magnetic recordin Chromium dioxide material, its preparation and magnetic recordin

1989-08-23

1992-03-17

Thibodeau, Paul J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428694, 428900, 4273722, 4274301, G11B 2300

Patent

active

050967797

ABSTRACT:
A chromium dioxide material consisting of acicular, ferromagnetic chromium dioxide particles having a nonmagnetic, hydrogen-containing protective surface layer, which material has improved stability to chemical decomposition, a process for its preparation and magnetic recording media containing this chromium dioxide and having good long-term stability of the residual magnetization under conditions of high humidity and temperature are described.

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patent: 3278263 (1964-11-01), Cox
patent: 3512930 (1970-05-01), Bottier et al.
patent: 3686031 (1972-08-01), Balthis et al.
patent: 3687726 (1972-08-01), Pye et al.
patent: 3767580 (1973-10-01), Kitamoto et al.
patent: 4495246 (1985-01-01), Steck et al.

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