Drug – bio-affecting and body treating compositions – Live skin colorant containing
Patent
1993-12-08
2000-07-04
Gardner-Lane, Sally
Drug, bio-affecting and body treating compositions
Live skin colorant containing
424401, 424 64, 424 61, A61K 702, A61K 7027
Patent
active
060834919
DESCRIPTION:
BRIEF SUMMARY
The subject of the present invention is cosmetic compositions for the skin or superficial body growths, containing a dispersion of solid particles, into which are introduced solid particles whose surface is coated with a cationic polymer.
It is known that various makeup products such as loose or compacted powders, foundations, blushers, eye-shadows, makeup compositions for the eyelashes and eyebrows (for example mascaras), makeup compositions for the edge of the eyelids called eyeliners, as well as lipsticks are provided in the form of compositions comprising a dispersion of solid inorganic particles in a fatty binder. They may be anhydrous compositions or else oil-in-water or water-in-oil emulsions.
Depending on the types of compositions, the solid particles are either solely pigments (white and/or colored), intended to confer on the area of application (for example skin of the face or lips) a certain color, or particles, generally called "fillers", which have diverse functions varying with the nature of the particles.
In the compositions to be applied to the skin, there are often used fillers intended to provide a covering power, that is to say to mask the imperfections of the skin (differences in coloration, microreliefs) either by virtue of their opacity (such is the case especially for titanium and zinc oxides and for kaolin) or by their light-reflecting properties (such is the case especially for the lamellar fillers such as talc and micas). Fillers which are capable of absorbing the aqueous and oily secretions of the skin are also used in order to avoid the shiny appearance of the skin and the migration of the coloring materials: kaolin, starch, precipitated calcium carbonate, bentonite and the like are for example used for this purpose.
Micronized or non-micronized particles of TiO.sub.2 and ZnO are also used as ultraviolet-absorbing agents.
In lipsticks, the solid particles dispersed in an appropriate fatty binder are especially colored pigments, optionally in combination with white pigments (for example fine particles of titanium dioxide) which make it possible to impart a shade to the colors provided by the colored pigments.
Such white and/or colored pigments are also used in nail varnish compositions which optionally consist of a dispersion of these pigments in a solution of a film-forming polymer and a plasticizer in an appropriate organic solvent.
The preparation and use of the cosmetic compositions containing dispersions of solid particles pose several types of problems. One problem common to the preparation of all the compositions which have just been discussed lies in the difficulty of obtaining stable dispersions, so as to apply, for example to the skin, a regular makeup whose application is uniform and which retains a good homogeneity. For this, specialists have been led to perform surface treatments on the powders used, especially in order to modify the interfacial properties involved in the wetting and dispersion phenomena. The aim of these treatments is often to render the powder hydrophobic in order to enhance its incorporation into the formulation binders and oils, and to increase the stability of the dispersion by reducing the phenomena of flocculation and aggregation; see for example European Patent 279 319 which describes the coating of pigments with siliconized polymers.
These treatments therefore make it possible to solve the problems of stability of the dispersion by limiting the flocculation phenomena. However, they do not solve another important problem, namely the weak properties of adhesion of the solid particles to the skin. Indeed, it is known that the solid particles used especially in the compositions in the form of powders have only weak properties of adhesion to the skin. The surface treatments intended to improve the stability of the dispersions in the fatty binders do not provide a substantial improvement as far as the adhesion properties are concerned.
It is known furthermore that the makeup products for the face and for the eyes are often provided in the form of
REFERENCES:
patent: 3761418 (1973-09-01), Parran
patent: 5093110 (1992-03-01), Kamen
patent: 5147507 (1992-09-01), Gill
Candau Didier
Mellul Myriam
"L'Oreal"
Gardner-Lane Sally
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