Stabilized ferromagnetic chromium dioxide and process for its pr

Details Stabilized ferromagnetic chromium dioxide and process for its pr Stabilized ferromagnetic chromium dioxide and process for its pr

1978-04-04

1979-10-02

Carter, Herbert T.

Compositions

Magnetic

Chromium or chromium compound containing

423274, 423607, 427127, 427215, 428404, 428539, 428900, C01G 3702

Patent

active

041698029

ABSTRACT:
The present invention concerns a stabilized ferromagnetic chromium dioxide and a process for obtaining the same. More particularly, the present invention relates to ferromagnetic chromium dioxide stabilized by means of the coating of its particles with a stabilizing substance, characterized in that the stabilizing substance is selected from the group consisting of a zinc, aluminum or chromium (III) polyphosphates having a high molar ratio phosphorus/metal and having, depending on the metal, the following formula: P.sub.2 O.sub.5.nZnO.mH.sub.2 O wherein "n" in general is comprised between 0.286 and 0.667 while "m" is generally comprised between 0 and 2.570;
P.sub.2 o.sub.5.nAl.sub.2 O.sub.3.mH.sub.2 O wherein "n" is in general comprised between 0.225 and 0.500, while "m" is generally comprised between 0 and 2.68;
P.sub.2 o.sub.5.nCr.sub.2 O.sub.3.mH.sub.2 O wherein "n" is in general comprised between 0.143 and 0.333, while "m" is generally comprised between 0.002 and 2.46.

REFERENCES:
patent: 3686031 (1972-08-01), Balthis
patent: 3811942 (1974-05-01), Rennolds
patent: 3841907 (1974-10-01), Leutner et al.
patent: 4068038 (1978-01-01), Montiglio et al.

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