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|1. (WO2001036331) COLLOIDAL DISPERSION OF A CERIUM COMPOUND AND CONTAINING CERIUM III, PREPARATION METHOD AND USE|
|Applicants:||RHODIA TERRES RARES
|Title:||COLLOIDAL DISPERSION OF A CERIUM COMPOUND AND CONTAINING CERIUM III, PREPARATION METHOD AND USE|
The invention concerns a colloidal dispersion of a cerium compound containing cerium III. Said dispersion is characterised in that it has a cerium oxide concentration of at least 50 g/l, a proportion of cerium III relative to the total cerium of at least 0.5 %, a conductivity of more than 5 mS/cm, a pH ranging between 4 and 8 and it consists of particles having a mean diameter of more than 15 nm. It is obtained by a method which consists in: reacting at least a cerium III salt with a base in the presence of an acid in an amount such that the H+/Ce ratio is more than 1; then re-dispersing in water the precipitate derived from the preceding reaction. Said dispersions can be used in catalysis, lubrication, in ceramics, for making luminophore compounds or polymer films, in cosmetics and as anticorrosive agents.