Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1995-05-18
1997-07-01
Mosley, Terressa
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
424 69, 514844, 514845, 514846, 514847, 514848, B32B 516
Patent
active
056436726
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to cosmetic compositions for the skin or the exoskeleton containing a dispersion of solid particles whose surface is coated by means of an amphoteric polymer.
2. Background Information
Various make-up products, such as loose or compact powders, make-up foundations, blushers, eyeshadows and also lipsticks, are known to be presented in the form of compositions comprising a dispersion of solid inorganic particles in a fatty binding agent. The products in question can be anhydrous compositions or alternatively oil-in-water or water-in-oil emulsions.
Depending on the type of composition, the solid particles are exclusively pigments (white and/or coloured) intended to impart a certain coloration to the skin of the face or lips, or particles, generally referred to as "fillers", which have diverse functions which vary with the nature of the particles.
In compositions for application to the skin, use is often made of fillers intended to provide a covering power, that is to say to mask skin imperfections (differences in coloration, minor unevenness), either as a result of their opacity (this applies, in particular, to titanium oxide, zinc oxide and kaolin), or through their properties of reflection of light (this applies, in particular, to lamellar fillers such as talc and micas). Fillers are also used which are capable of absorbing the aqueous and oily secretions of the skin, in order to avoid a glistening appearance of the skin and the migration of colorants: kaolin, starch, precipitated calcium carbonate, bentonite and the like, are, for example, employed for this purpose.
Use is also made, in compositions intended for protection against UV radiation, of particles, micronized or otherwise, of TiO.sub.2 and of ZnO as ultraviolet-absorbing agents.
In lipsticks, the solid particles dispersed in a suitable fatty binding agent are mostly coloured pigments, optionally in combination with white pigments (for example fine particles of titanium dioxide) which enable the shades of the colours provided by the coloured pigments to be varied.
Such white and/or coloured pigments are also used in nail varnish compositions, which consist essentially of a dispersion of these pigments in a solution of a film-forming polymer and a plasticizer in a suitable organic solvent.
The preparation and use of cosmetic compositions containing dispersions of solid particles create several kinds of problem. One problem common to the production of all the compositions just mentioned lies in the difficulty of obtaining homogeneous and stable dispersions, so as to apply, for example to the skin, an even make-up whose application is uniform and which retains good homogeneity. This requirement has led the experts to perform surface treatments on the powders used, in particular in order to modify the interfacial properties participating in the phenomena of wetting and dispersion. The aim of these treatments is often to make the powder hydrophobic in order to promote its incorporation in the formulation binding agents and oils, and to increase the stability of the dispersion by decreasing flocculation and aggregation phenomena; see, for example, European Patent 279,319, which describes the coating of pigments with silicone polymers.
Dispersion of the solid particles in aqueous media also gives rise to difficulties and, in order to overcome these, dispersing agents which are introduced into the dispersion medium are used in particular. Thus, for example, Patent FR 2,655,875 relates to the use of amphoteric copolymers as dispersing agents, especially in the papermaking field, and Patent FR 2,550,795 describes a pigment composition for paints containing an amphoteric dispersing resin. These various treatments hence enable the problems of stability of the dispersion to be resolved by limiting the flocculation phenomena. However, they do not resolve another major problem, namely the poor properties of adhesion of the solid particles to the skin. In effect, it is known that
REFERENCES:
patent: 4818614 (1989-04-01), Fukui et al.
Marchi Patricia
Mellul Myriam
"L'Oreal"
Mosley Terressa
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