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1. (WO2001036331) COLLOIDAL DISPERSION OF A CERIUM COMPOUND AND CONTAINING CERIUM III, PREPARATION METHOD AND USE

Pub. No.:    WO/2001/036331    International Application No.:    PCT/FR2000/003199
Publication Date: Sat May 26 01:59:59 CEST 2001 International Filing Date: Sat Nov 18 00:59:59 CET 2000
IPC: A61K 8/04
A61K 8/19
A61K 8/20
A61K 8/36
A61Q 17/04
A61Q 19/00
B01J 13/00
C01F 17/00
C08K 3/22
Applicants: RHODIA TERRES RARES
CHANE-CHING, Jean-Yves
Inventors: CHANE-CHING, Jean-Yves
Title: COLLOIDAL DISPERSION OF A CERIUM COMPOUND AND CONTAINING CERIUM III, PREPARATION METHOD AND USE
Abstract:
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.