Coated cosmetic powder
The present invention refers to a cosmetic powder whose coating includes polymers or co-polymer belonging to the Poly Alpha Hydroxi Acids family, to a cosmetic composition that contains it and to the process of preparation of the powder.
1. A cosmetic powder comprising:
a powder comprising at least one of the group consisting of talc, mica, kaolin, nylon, pigments, and spherical and non-spherical silica; and
a coating applied to the powder, wherein the coating comprises at least one alpha hydroxy acid polymer or copolymer whereby said alpha hydroxy acid polymer or copolymer can degrade and release onto the skin of a wearer at least one of monomers and oligomers on application of said cosmetic powder to the skin,
wherein said alpha hydroxy acid polymer or copolymer is in a quantity between 0.1 to 20% by weight of the coated cosmetic powder; and
said power is in a quantity between 60 to 99% by weight of the coated cosmetic powder.
2. The cosmetic powder according to claim 1 , wherein said coating includes poly DL-lactide.
3. The cosmetic powder according to claim 1 , wherein said coating includes at least one of lipid, lipophilic and hydrophilic functional substances.
4. The cosmetic powder according to claim 1 , wherein said coating includes at least one of vitamins and amino acids.
5. Cosmetic composition containing at least one cosmetic powder according to claim 1 .
6. A process for the preparation of a cosmetic powder comprising the steps of:
preparation of a powder phase, wherein said powder phase comprises at least one of the group consisting of talc, mica, kaolin, nylon, pigments, and spherical and non-spherical silica;
preparation of an alpha hydroxy acids polymer or co-polymer phase;
mixture of said powder phase and of said alpha hydroxy acids polymer or co-polymer phase with a solvent in slurry or spray; and
evaporation of the solvent, to form an alpha hydroxy acids polymer or co-polymor coating on said powder, whereby said coating can degrade and release onto the skin of a wearer at least one of monomers and oligomers on application of said cosmetic powder to the skin;
wherein the alpha hydroxy acid polymer or copolymer is in a quantity between 0.1 to 20% by weight of the coated cosmetic powder; and
said powder is in a quantity between 60 to 99% by weight of the coated cosmetic powder.
7. The process according to claim 6 , wherein said solvent is ethyl acetate.
8. The process according to claim 6 , further comprising the step of mixing said alpha hydroxy acids polymer or co-polymer phase with at least one of lipid, lipophilic and hydrophilic functional substances.
9. The process according to claim 6 , further comprising the step of mixing said alpha hydroxy acids polymer or co-polymer phase with at least one of vitamins and amino acids.
10. The cosmetic powder according to claim 3 , comprising said coating in a quantity between 0.001 and 80% by weight.
11. The cosmetic powder according to claim 10 , comprising said coating in a quantity between about 1 and 30% by weight.