Drug – bio-affecting and body treating compositions – Topical body preparation containing solid synthetic organic...
Patent
1997-02-21
1998-12-22
Harrison, Robert H.
Drug, bio-affecting and body treating compositions
Topical body preparation containing solid synthetic organic...
424401, 424 7803, 424 7808, 514937, 514970, A61K 702, A61K 711
Patent
active
058515178
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/FR96/00929, filed Jun. 17, 1996.
The present invention relates to a cosmetic, pharmaceutical or hygiene composition comprising a dispersion of polymer particles dispersed in a non-aqueous medium, as well as to the use of such a dispersion in a cosmetic, pharmaceutical or hygiene composition.
It is known to use in cosmetics certain dispersions of polymer particles of nanometric size in organic media such as lower alcohols or aromatic or aliphatic hydrocarbons. The polymers are, in this case, usually used as film-forming agent in make-up products such as mascaras, eye-liners, eyeshadows or nail varnishes. The cosmetic compositions obtained after incorporation of these dispersions of polymer particles are not always of satisfactory stability. Make-up compositions based on an organic polymer dispersion in a medium consisting of lower monoalcohols or aliphatic or aromatic hydrocarbons are also known in patent application JP-A-78 94041. Dispersions of acrylic polymers in an alcoholic medium which are stabilized with a block copolymer based on polymethyl methacrylate and poly-tert-butyl acrylate are also known in application WO-A-95/09074.
The Applicant has discovered, surprisingly, novel dispersions of polymer particles stabilized by specific stabilizers, which will be defined later, in many types of non-aqueous medium. The aim of the present invention is to propose a dispersion of particles which remain in the form of elementary particles, without forming agglomerates, when they are in dispersion in non-aqueous media.
One subject of the present invention is thus a composition comprising, in a cosmetically, pharmaceutically and/or hygienically acceptable medium, a dispersion of particles of at least one polymer stabilized at the surface by a stabilizer in a non-aqueous medium, characterized in that: compound chosen from the group consisting of: according to the Hansen solubility space, of less than 17 (MPa).sup.1/2, Hansen solubility space, of less than or equal to 20 (MPa).sup.1/2, stabilizer is chosen from the group consisting of sequential or grafted block copolymers comprising at least one block of polyorganosiloxane type and at least one block of a radical polymer or of a polyether or of a polyester, stabilizer is chosen from the group consisting of: polyorganosiloxane type and at least one block of a radical polymer or of a polyether or of a polyester, and of acrylates or methacrylates of C.sub.8 -C.sub.30 alcohols, resulting from the polymerization of dienes, which is hydrogenated or non-hydrogenated, and at least one block of a vinyl or acrylic polymer or of a polyether or of a polyester, or mixtures thereof.
Another subject of the invention is the use of the said particle dispersion in and for the preparation of a cosmetic, hygiene or pharmaceutical composition.
One advantage of the present invention is that it is thus possible to calibrate at will the size of the polymer particles, as well as to modify their size polydispersity during the synthesis. This is not possible when pigments in particulate form are used, since their constitution does not allow the average size of the particles to be modified, nor their hardness.
Another advantage of the invention is that it is thus possible to obtain polymer particles of very small size, in particular of nanometric size, which is not the case, for example, with other types of particles such as microspheres whose diameter is generally greater than 1 micron. This large size, of the order of a micron, has the drawback of entailing a certain visibility of the particles with the eye, when they are in a composition and/or when they are applied to the skin, as well as poor stability of the composition comprising the said dispersion.
Thus, another advantage of the use of the dispersion according to the invention is to allow the production of a stable composition, which may be transparent, translucent or opaque, according to the size of the polymer particles which are dispersed therein.
The dispersions according to the invention thus co
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Mondet Jean
Mougin Nathalie
"L'Oreal"
Harrison Robert H.
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