Colloidale dispersion and redispersible composition in the...

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B01J 13/00 (2006.01) B01J 23/10 (2006.01) C01F 17/00 (2006.01) C04B 35/50 (2006.01) C09D 5/08 (2006.01) C10M 103/06 (2006.01)

Patent

CA 2223842

The invention relates to a colloidal dispersion, characterized in that it comprises a cerium oxide and at least one additive selected amongst .beta. dicetones, the carboxylic monoacides comprising an .alpha. or .beta. hydroxy function and the diols. It also relates to a redispersible composition in the form of a cerium oxide based colloidal dispersion and the same said additives. The colloidal dispersion of the invention may be obtained by a process which is characterized in that at least one above mentioned additive is added to a starting cerium oxide colloidal dispersion. Finally, the invention relates to the use of a dispersion of the above type or of the type obtained by redispersing a redispersible composition, on a substrate as anticorrosion agent, in a cosmetic composition, for catalytic purposes particularly in motor vehicule post combustion, for lubrication or in ceramics.

L'invention concerne une dispersion colloïdale, caractérisée en ce qu'elle comprend un oxyde de cérium et au moins un additif choisi parmi les .beta. dicétones, les monoacides carboxyliques comportant une fonction hydroxy en .alpha. ou .beta. et les diols. Elle concerne aussi une composition redispersible sous forme d'une dispersion colloïdale à base d'oxyde de cérium et des mêmes additifs précités. La dispersion colloïdale de l'invention peut être obtenue par un procédé qui est caractérisé en ce qu'on ajoute à une dispersion colloïdale d'oxyde de cérium de départ au moins un additif précité. L'invention concerne enfin l'utilisation d'une dispersion de type ci-dessus ou du type obtenu par remise en dispersion d'une composition redispersible, sur un substrat comme agent anticorrosion, dans une composition cosmétique, en catalyse notamment pour post combustion automobile, en lubrification ou dans les céramiques.

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