Powdery cosmetic composition comprising nanocrystalline cellulose

1. A powdery cosmetic composition in the form of a compacted powder comprising, in a physiologically acceptable medium,

(i) a pulverulent phase comprising functionalized nanocrystalline cellulose, wherein said functionalized nanocrystalline cellulose is carboxylated nanocrystalline cellulose, and

(ii) a binder phase.

2. The powdery cosmetic composition according to claim 1 , wherein said carboxylated nanocrystalline cellulose is in the form of a nanocrystalline cellulose carboxylate salt.

3. The powdery cosmetic composition according to claim 2 , wherein said nanocrystalline cellulose carboxylate salt is a nanocrystalline cellulose sodium carboxylate.

4. The powdery cosmetic composition according to claim 3 , wherein said so nanocrystalline cellulose sodium carboxylate is produced by the method comprising the steps of:

(a) providing cellulose,

(b) mixing said cellulose with a peroxide, thereby producing a reaction mixture,

(c) heating the reaction mixture, and/or exposing the reaction mixture to UV radiation, and

(d) salifying the reaction mixture.

5. The powdery cosmetic composition according to claim 1 , wherein said nanocrystalline cellulose has a spherical or ovoid shape.

6. The powdery cosmetic composition according to claim 1 , wherein said nanocrystalline cellulose has an average particle size of less than about 20 μm.

7. The powdery cosmetic composition according to claim 1 , wherein said nanocrystalline cellulose has an average particle size from about 2 μm to about 10 μm.

8. The powdery cosmetic composition according to claim 1 , wherein said nanocrystalline cellulose is present in an amount of from about 0.1% to about 90% by weight relative to the total weight of the composition.

9. The powdery cosmetic composition according to claim 1 , wherein said pulverulent phase is present in an amount of greater than or equal to 30% by weight relative to the total weight of the composition.

10. The powdery cosmetic composition according to claim 1 , wherein said pulverulent phase comprises a filler.

11. The powdery cosmetic composition according to claim 10 , wherein said filler is selected from the group consisting of organic fillers and inorganic fillers.

12. The powdery cosmetic composition according to claim 1 , wherein said pulverulent phase contains at least one coloring agent.

13. The powdery cosmetic composition according to claim 12 , wherein said least one coloring agent is selected from pigments and nacres.

14. The powdery cosmetic composition according to claim 12 , wherein said at least one coloring agent is present in an amount of at least 0.1% by weight relative to the total weight of the composition.

15. The powdery cosmetic composition according to claim 14 , wherein at least one coloring agent is present in an amount of from 0.1% to 60% by weight relative to the total weight of the composition.

16. The powdery cosmetic composition according to claim 1 , wherein said binder phase is present in an amount of at least 10% by weight relative to the total weight of the composition.

17. The powdery cosmetic composition according to claim 1 , wherein said binder phase comprises a liquid binder phase and/or a solid binder phase.

18. The powdery cosmetic composition according to claim 17 , wherein said liquid binder phase comprises at least one non-volatile oil.

19. The powdery cosmetic composition according to claim 18 , wherein said at least one non-volatile oil is selected from the group consisting of non-volatile hydrocarbon-based oils and non-volatile silicone-based oils.

20. The powdery cosmetic composition according to claim 17 , wherein the solid binder phase comprises at least one component selected from the group consisting of waxes, metallic soaps and polymers in powder form.

21. The powdery cosmetic composition according to claim 1 , wherein the compacted powder further comprises a UV screening agent.

22. The powdery cosmetic composition according to claim 21 , wherein said UV screening agent is selected from the group consisting of mineral UV screening agents and organic UV screening agents.

23. The powdery cosmetic composition according to claim 1 , wherein the compacted powder further comprises a preservative, a cosmetic active ingredient, a moisturizer, a surfactant or a fragrance.

24. The powdery cosmetic composition according to claim 1 , wherein the powdery composition is selected from the group consisting of a face powder, a foundation, a blusher, a concealer, and an eyeshadow.

25. A method of preparing a cosmetic composition in the form of compacted powder with satisfactory cohesive properties comprising adding a pulverulent phase according to claim 1 to a cosmetic composition.

26. The powdery cosmetic composition according to claim 1 , wherein said nanocrystalline cellulose is present in an amount from 1% to 50% by weight relative to the total weight of the composition.

27. The powdery cosmetic composition according to claim 1 , wherein said pulverulent phase is present in an amount of at least 40%, by weight relative to the total weight of the composition.