Cosmetic foundation
View Patent ↗A cosmetic composition is provided comprising: (a) metal oxide particles; and (b) cross-linked, non-emulsifying organopolysiloxane elastomer, wherein organo-functionalised silicone fibrils are bonded to and extend away from the surface of the metal oxide particles.
1. A cosmetic composition comprising:
(a) metal oxide particles having a coating of organo-functionalized silicone fibrils that are bonded to and extend away from the surface of the metal oxide particles, wherein the fibril-coated metal oxide particles are coated with a hydrophobic coating; and
(b) a cross-linked, non-emulsifying organopolysiloxane elastomer selected from the group consisting of a dimethicone/vinyl dimethicone crosspolymer, a dimethicone/phenyl vinyl/dimethicone crosspolymer, a lauryl dimethicone/vinyl dimethicone crosspolymer, and mixtures thereof.
2. The cosmetic composition of claim 1 , comprising from about 0.01 to about 15% by weight of the cosmetic composition of cross-linked, non-emulsifying organopolysiloxane elastomer.
3. The cosmetic composition of claim 1 , comprising from about 2% to about 5% by weight of the cosmetic composition of cross-linked, non-emulsifying organopolysiloxane elastomer.
4. The cosmetic composition of claim 1 , wherein the fibrils are attached by treating the metal oxide particles with an organo-functionalised silicone polymer comprising a reactive moiety selected from the group consisting of amino, imino, halogen, hydroxyl, and alkoxyl.
5. The cosmetic composition of claim 4 , wherein the organo-functionalised silicone polymer comprises from about 5 to about 100 silicone units.
6. The cosmetic composition of claim 5 , wherein the organo-functionalised silicone polymer comprises from about 25 to about 50 silicone units.
7. The cosmetic composition of claim 4 , wherein the organo-functionalised silicone polymer has a ratio (Mw/Mn) of weight-average molecular weight (Mw) to number-average molecular weight (Mn) from about 1.0 to about 1.3.
8. The cosmetic composition of claim 4 , wherein the organo-functionalised silicone is a linear organofunctionalised silicone.
9. The cosmetic composition of claim 8 , wherein the reactive moiety is located at one end of its molecular chain.
10. The cosmetic composition of claim 4 , wherein the organo-functionalised silicone is a branched chain organofunctionalised silicone.
11. The cosmetic composition of claim 10 , wherein the reactive moiety is located on a side chain.
12. The cosmetic composition of claim 11 , wherein the side chain on which the reactive moiety is found is located within five silicone repeating units of one end of the silicone backbone.
13. The cosmetic composition of claim 1 , wherein the metal oxide particles have a number weighted average secondary particle size from about 0.001 μm to about 100 μm.
14. The cosmetic composition of claim 13 , wherein the metal oxide particles have a number weighted average secondary particle size from about 0.015 μm to about 10 μm.
15. The cosmetic composition of claim 14 , wherein the metal oxide particles have a number weighted average secondary particle size from about 0.05 μm to about 1 μm.
16. The cosmetic composition of claim 1 , wherein the metal oxide particles have a number weighted average primary particle size from about 10 μm to about 500 nm.
17. The cosmetic composition of claim 16 , wherein the metal oxide particles have a number weighted average primary particle size from about 15 μm to about 100 nm.
18. The cosmetic composition of claim 17 , wherein the metal oxide particles have a number weighted average primary particle size from about 20 nm to about 65 nm.
19. The cosmetic composition of claim 1 , wherein the metal oxide particles are selected from the group consisting of titanium dioxide, zinc oxide, cerium oxide, zirconium oxide, iron oxide particles and mixtures thereof.
20. The cosmetic composition of claim 1 , wherein the hydrophobic coating is manufactured by treating the surface of the metal oxide particles with a material selected from the group consisting of reactive organo-polysiloxane, polyolefin, hydrogenated lecithin, salts of hydrogenated lecithin, N-acylamino acid, salts of N-acylamino acid, dextrin fatty acid esters and mixtures thereof.
21. The cosmetic composition of claim 20 , wherein the reactive organopolysiloxane is selected from the group consisting of organo hydrogen polysiloxane, triorgano siloxy silicic acid, organopolysiloxane modified at both terminal ends with trialkoxy groups and mixtures thereof.
22. The cosmetic composition of claim 1 , comprising less than 1.5% of the cosmetic composition of cross-linked emulsifying organopolysiloxane elastomer.
23. The cosmetic composition of claim 22 , comprising less than 1% of the cosmetic composition of cross-linked emulsifying organopolysiloxane elastomer.
24. The cosmetic composition of claim 23 , comprising less than 0.5% of the cosmetic composition of cross-linked emulsifying organopolysiloxane elastomer.
25. The cosmetic composition of claim 1 , additionally comprising from about 7% to about 80% by weight of the cosmetic composition of an oil.
26. The cosmetic composition of claim 25 , wherein the oil is selected from the group consisting of a volatile oil, a non-volatile oil, and mixtures thereof.
27. The cosmetic composition of claim 26 , wherein the volatile oil is selected from the group consisting of a volatile cyclic silicone oil, a volatile linear dimethicone having a viscosity from 2 to 50×10 −6 m 2 /s (2-50 cst), and mixtures thereof.
28. The cosmetic composition of claim 27 , wherein a ratio of the volatile cyclic silicone oil to the volatile linear dimethicone is from about 1:1 to about 25:1.
29. The cosmetic composition of claim 28 , wherein the ratio of the volatile cyclic silicone oil to the volatile linear dimethicone is from about 5:1 to about 10:1.
30. The cosmetic composition of claim 1 , additionally comprising an emulsifier.
31. The cosmetic composition of claim 30 , wherein the emulsifier is selected from the group consisting of polyoxyalkylene copolymers, polyglyceryl copolymers and mixtures thereof.
32. The cosmetic composition of claim 30 , wherein the emulsifier is free of a polyoxyalkylene emulsifier.
33. The cosmetic composition of claim 1 additionally comprising an organic sunscreen.
34. The cosmetic composition of claim 1 , additionally comprising spherical polymeric particles having an average particle diameter from about 1 μm to about 50 μm.
35. A cosmetic foundation composition comprising a cosmetic composition according to claim 1 .
36. A cosmetic water-in-oil composition comprising:
(a) metal oxide particles having organo-functionalised silicone fibrils covalently bonded or chemisorbed to and extending away from surfaces of the metal oxide particles, wherein the fibril-coated metal oxide particles are coated with a hydrophobic coating; and
(b) a cross-linked, non-emulsifying organopolysiloxane elastomer selected from the group consisting of a dimethicone/vinyl dimethicone crosspolymer, a dimethicone/phenyl vinyl/dimethicone crosspolymer, a lauryl dimethicone/vinyl dimethicone crosspolymer, and mixtures thereof.
37. The cosmetic water-in-oil composition of claim 36 , comprising less than 1.5% of a crosslinked emulsifying organopolysiloxane elastomer by weight of the cosmetic water-in-oil composition.