Chemistry of inorganic compounds – With additive – Coating or binder
Patent
1979-07-16
1981-01-13
Cooper, Jack
Chemistry of inorganic compounds
With additive
Coating or binder
252 6251, 252 626, 252 6262, 252 6264, 423607, 427215, 428403, 428539, 428900, C01G 3702
Patent
active
042449324
ABSTRACT:
A ferromagnetic chromium dioxide stabilized by coating the particles thereof with a stabilizing substance is disclosed, wherein the stabilizing substance consists essentially of an equimolecular mixture of Fe.sub.2 O.sub.3 and MnO or of a mixture of ferrite MeFe.sub.2 O.sub.4 with oxides Fe.sub.2 O.sub.3 and MeO, wherein Me represents Cu, Co, Zn or Mg and wherein the molar ratio Fe.sub.2 O.sub.3 /MeO is equal to 1, the quantity of the ferrite in the mixture being such as results from calcining, at temperature between 250.degree. and 350.degree. C., equimolecular quantities of Fe.sub.2 O.sub.3 and MeO. A process for obtaining the stabilized CrO.sub.2 is also disclosed wherein the CrO.sub.2 is dispersed in water and on it are co-precipitated Fe(OH).sub.3 and Mn(OH).sub.2 or Me(OH).sub.2 in stoichiometric quantities with respect to each other; after which the CrO.sub.2, in admixture with the hydroxides, is separated from the water, dried at a temperature not exceeding 100.degree. C. and then calcined at temperatures between 250.degree. and 350.degree. C.
REFERENCES:
patent: 3687726 (1972-08-01), Pye
patent: 4169802 (1979-10-01), Basile et al.
Basile Giampiero
Boero Giancarlo
Cooper Jack
Montedison S.p.A.
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