Process for manufacturing omniphobic cosmetic pigments

Patent metadata

Field	Value
Publication number	US-11040000-B2
Application number	US-201916684802-A
Country	US
Kind code	B2
Filing date	Nov 15, 2019
Priority date	Nov 15, 2018
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

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.

First claim

The invention claimed is:

1. 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).

2. The process according to claim 1 , wherein the metal oxide particles are selected from the group consisting of titanium oxide, iron oxide, zinc oxide, zirconium oxide, yellow iron oxide, black iron oxide, red iron oxide, chromium oxide, chromium hydroxide, ultramarine, and silicates.

3. The process according to claim 1 , wherein the metal oxide particles have a size ranging from 100 nm to 100 μm.

4. The process according to claim 1 , wherein the poly(β-(1→4)-D-glucosamine) is either totally deacetylated or both deacetylated and acetylated.

5. The process according to claim 1 , wherein the poly(β-(1→4)-D-glucosamine) has a viscosity measured at about 25° C., ranging from 10 cP to 2000 cP.

6. The process according to claim 4 , wherein the poly(β-(1→4)-D-glucosamine) is partially deacetylated and has a deacetylation degree ranging from 70% to 99%.

7. The process according to claim 1 , wherein the poly(β-(1→4)-D-glucosamine) has a mass average molar mass (Mw) ranging from 40 000 Da to 500 000 Da.

8. The process according to claim 1 , wherein the amount of the poly (β-(1→4)-D-glucosamine) ranges from more than 0% to 20% by weight to the total weight of said poly (β-(1→4)-D-glucosamine) and metal oxide particles.

9. An omniphobic cosmetic pigment obtained by the process according to claim 1 .

10. The omniphobic cosmetic pigment of claim 9 , comprising or consisting of titanium oxide particles on which are adsorbed chitosan chains.

11. A cosmetic composition comprising the omniphobic cosmetic pigment according to claim 9 and a cosmetically acceptable base.

12. The composition according to claim 11 , wherein the cosmetically acceptable base is anhydrous.

13. The composition according to claim 11 , which is an aqueous gel, an oily gel, a paste, a cream, a lotion, a milk, a stick, a soap, a foam, a shampoo, a compact powder, a loose powder, a nail polish, a beauty mask, an aerosol, a film, a serum, an emulsion, or a patch.

14. A cosmetic skin improvement method comprising administering to a subject in need thereof the omniphobic cosmetic pigment according to claim 9 , or a cosmetic composition comprising said omniphobic cosmetic pigment and a cosmetically acceptable base.

15. The skin improvement method according to claim 14 , wherein the composition is administered to the skin of a subject in need thereof, once per day.

16. A composition for make-up, skincare, sun care, haircare, nail polish, toiletries, baby care or pet care, comprising the cosmetic composition of claim 11 .

17. The process according to claim 4 , wherein the poly (β-(1→4)-D-glucosamine) is chitosan.

18. The process according to claim 2 , wherein the silicates are selected from the group consisting of mica, sericite, kaolin, talc, aluminium silicate, magnesium silicate, calcium silicate and clay.

Assignees

• Commissariat A Lenergie Atomique Et Aux Energies Alternatives Cea
• Centre Nat Rech Scient
• Miyoshi Europe S A S

Inventors

• Guenoun Patrick
• Fajolles Christophe
• Takahashi Tetsuya
• Nicolas Stephane
• Bosmet Pauline
• Gougeon Sébastien

Classifications

• C09B67/0097

  Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes · CPC title

• A61K2800/43

  Pigments; Dyes · CPC title

• A61K8/736 Primary

  Chitin; Chitosan; Derivatives thereof · CPC title

• A61K8/29

  Titanium; Compounds thereof · CPC title

• A61K8/19

  containing inorganic ingredients · CPC title