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US 5,308,548 AGranted
Preparing a dispersible, sol-forming cerium (IV) composition
AssigneeRhone-Poulenc Specialities Chimiques
InventorJean-Yves Chane-Ching
Life of this patent
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Abstract
Preparing a novel cerium (IV) compound, well adopted for the production of aqueous colloidal sols therefrom, has the general formula (I): ##STR1## wherein M is an alkali metal or a quaternary ammonium radical; t ranges from 0.1 to 0.3; n is 0 or 1; x ranges from 0.1 to 0.7; y is a number such that y=4+t-x-z; and z ranges from 0.3 to 0.6.
Claims20
A process for the preparation of a cerium (IV) material selected from the group of materials having the general formula (I):
- Ce(M).sub.t (CH.sub.3 [CH.sub.2 ].sub.n COO.sup.-).sub.x (OH.sup.-).sub.y (NO.sub.3.sup.-).sub.z (I)
- wherein M is an alkali metal or a quaternary ammonium radical;
- t ranges from 0.1 to 0.3;
- n is 0 or 1;
- x ranges from 0.1 to 0.7;
- y is a number such that y=4+t-x-z;
- and z ranges from 0.3 to 0.6, comprising (i) forming an admixture by admixing an aqueous solution of a cerium (IV) nitrate salt with acetic or propionic acid, (ii) forming a reaction medium by reacting the admixture with a base, (iii) heating the reaction medium and producing a precipitate of said cerium (IV) material, (iv) separating the precipitate, and (v) drying said precipitate.
4 more elements
Dependencies are inferred from the claim text.