Cerium (IV) compound
AssigneeRhone-Poulenc Specialites Chimiques
InventorJean-Yves Chane-Ching
Life of this patent
Estimating the term…
Abstract
A novel cerium (IV) compound, well adopted for the production of aqueous colloidal sols therefrom, has the general formula (I): Ce (Me).sub.x (OH).sub.y (NO.sub.3).sub.z (I) wherein M is an alkali metal an ammonium radical; x ranges from 0.01 to 0.2; y is a number such that y=4-z+x; and z ranges from 0.4 to 0.7.
Claims32
An aqueously dispersible cerium (IV) material having the general formula (I):
- Ce (M).sub.x (OH).sub.y (NO.sub.3).sub.z (I)
- wherein M is an alkali metal or an ammonium radical;
- x ranges from 0.01 to 0.2;
- y is a number such that y=4-z+x;
- and z ranges from 0.4 to 0.7.
An aqueous colloidal dispersion of cerium (IV) material comprising an aqueously dispersible cerium (IV) material having the general formula (I):
- Ce (M).sub.x (OH).sub.y (NO.sub.3).sub.z (I)
- wherein M is an alkali metal or an ammonium radical;
- x ranges from 0.01 to 0.2;
- y is a number such that y=4-z+x;
- and z ranges from 0.4 to 0.7.
An aqueous colloidal dispersion containing a cerium (IV) precipitate material produced by (I) reacting an aqueous solution of a cerium (IV) salt with a base reactant to form a colloidal dispersion of a cerium (IV) material in water, said colloidal dispersion having a neutralization ratio ranging from at least 0.01 to not more than 3, and (II) heat treating said colloidal dispersion to precipitate the cerium (IV) material therefrom, wherein said cerium (IV) salt is added in an amount sufficient to create a cerium (IV) concentration of from 0.01 to 2 moles/liter.
An aqueous colloidal dispersion of a cerium (IV) material combined with a base, said cerium (IV) material having the general formula (I):
- Ce (M).sub.x (OH).sub.y (NO.sub.3).sub.z (I)
- wherein M is an alkali metal or an ammonium radical;
- x ranges from 0.01 to 0.2;
- y is the number such that y=4-z+x;
- and z ranges from 0.4 to 0.7, said base being present in an amount such that, the colloidal particulates have a hydrodynamic diameter ranging from 150 to 3000 .ANG..
A cerium (IV) precipitate material produced by (i) reacting an aqueous solution of a cerium (IV) salt with a base reactant to form a colloidal dispersion of a cerium (IV) material in water, said colloidal dispersion having a neutralization ratio ranging from at least 0.01 to not more than 3, and (ii) heat treating said colloidal dispersion to precipitate a cerium (IV) material therefrom.
Dependencies are inferred from the claim text.