US 11,040,000 B2 · Process for manufacturing omniphobic cosmetic pigments

Process for manufacturing omniphobic cosmetic pigments

AssigneesCommissariat à L'éNergie Atomique Et Aux éNergies Alternatives (Cea), Centre National De La Recherche Scientifique, Miyoshi Europe

InventorsPatrick Guenoun, Christophe Fajolles, Tetsuya Takahashi, Stephane Nicolas, Pauline Bosmet, Sébastien Gougeon

Life of this patent

Estimating the term…

Abstract

For the cosmetic field, omniphobic cosmetic pigments under the form of a core shell structure: the core is or includes of a metal oxide on which is adsorbed poly(β-(1→4)-D-glucosamine) chains; the chains being acetylated, or partially or totally deacetylated. Also, the process for manufacturing the omniphobic cosmetic pigments, including: (i) preparing an acidic aqueous solution including metal oxide particles and a poly (β-(1→4)-D-glucosamine), the poly (β-(1→4)-D-glucosamine) being acetylated, or partially or totally deacetylated; and (ii) increasing the pH until 12, of the solution obtained at step (i) in order to obtain the adsorption of said poly (β-(1→4)-D-glucosamine on the metal oxide particles and the precipitation of the resulting metal oxide particles coated with the poly (β-(1→4)-D-glucosamine.

Claims18

Dependent claims

A process for manufacturing an omniphobic cosmetic pigment, said process comprising:

preparing an acidic aqueous solution comprising metal oxide particles and a poly(β-(1→4)-D-glucosamine), said poly(β-(1→4)-D-glucosamine) being acetylated, or partially or totally deacetylated;
and
(ii) increasing the pH until about 12, of the solution obtained at step (i) in order to obtain the adsorption of said poly (β-(1→4)- D-glucosamine) on the metal oxide particles and the precipitation of the resulting metal oxide particles coated with said poly(β-(1→4)- D-glucosamine).

Dependencies are inferred from the claim text.