Wash resistant compositions containing aminosilicone
View Patent ↗Compositions and methods are disclosed for imparting a long-wearing color to keratin fibers, including hair. More specifically, the invention relates to cosmetic compositions and methods for improving retention of particulate materials, such as pigments, on hair to artificially color the hair and/or to impart other aesthetic benefits to the hair. The compositions comprise at least one aminosilicone polymer having at least one diamino functional group, and a functional group equivalent weight (FGEW) from about 1,000 to about 2,000 g/mol and a non-spherical particulate material, preferably a pigment or a lake.
1. A method for imparting a long-wearing color to hair of the scalp, comprising applying to said hair of the scalp a composition comprising:
(a) at least one aminosilicone polymer having at least one aminoethylaminopropyl group and a functional group equivalent weight (FGEW) from 1,000 to 2,000 g/mol, and
(b) a non-spherical particulate material, wherein said non-spherical particulate material is a pigment or lake,
wherein said aminosilicone polymer improves retention of said particulate material on the keratinous substrate over time as compared to an otherwise identical composition in the absence of said aminosilicone, and
wherein said composition is applied to the hair of the scalp prior to shampooing, and wherein the retained particulate material in said composition imparts a long wearing color to the hair of the scalp.
2. The method according to claim 1 , wherein said aminosilicone polymer has a viscosity from about 500 to about 5,000 cP at 25° C.
3. The method according to claim 1 , wherein said aminosilicone polymer is branched.
4. The method according to claim 1 , wherein said aminosilicone polymer has the structure:
where
x is 3,
y is 2, and
m and n are independently each an integer from 1 to 5,000 and are selected to provide a FGEW from 1,000 to 2,000 g/mol.
5. The method according to claim 1 , wherein said pigment is an iron oxide pigment.
6. The method according to claim 1 , wherein said non-spherical particulate material has a plate-like or elongated shape.