Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-05-10
2001-10-23
Dudash, Diana (Department: 1619)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S078030, C424S078020, C424S078080, C424S070700, C424S070100, C424S059000, C424S061000, C424S063000, C424S064000, C524S027000, C524S860000, C524S862000
Reexamination Certificate
active
06306411
ABSTRACT:
The present invention relates to a composition containing an aqueous dispersion of particles of film-forming polymer and an aqueous suspension of polyorganosiloxane particles, being intended in particular for the cosmetics field. More specifically, the invention relates to a composition for caring for and making up keratin substances such as the skin, including the lips and the scalp, the nails, and the hair, including the eyelashes and the eyebrows, of human beings.
This composition can be in the form of a mascara, an eyeliner, a product for the lips, a face powder, an eyeshadow, a foundation, a make-up product for the body, a concealer product, a product for the nails, an antisun protective composition, a skin coloring composition, or a care product for the skin or superficial body growths.
Products for making up or caring for the skin or lips of human beings, such as eyeliners, foundations, or lipsticks, or alternatively for the eyelashes such as mascaras, are usually applied in the form of a thin uniform coat, leading to the formation of a film.
Make-up compositions for the skin, in particular eyeliners, or for the eyelashes, comprising an aqueous dispersion of film-forming polymer are known from U.S. Pat. Nos. 3,639,572 and 4,423,031, which are incorporated herein by reference. The film obtained with these aqueous compositions does not always have good water resistance. For example, on contact with water during bathing or taking a shower, they partially disintegrate by crumbling away or by diffusing. The crumbling and diffusion of the film gives rise to a substantial loss of intensity of the color of the make-up, obliging the consumer to freshen the application of the make-up product. Moreover, the diffusion of the film forms a highly unaesthetic aureole around the made-up region (in particular the eyes). Tears and perspiration also give rise to these same drawbacks. This is especially the case for an eyeliner.
Furthermore, these compositions also have the drawback of transferring, i.e. of becoming at least partly deposited, leaving marks on certain supports with which they may come into contact, in particular a fabric (clothing, towels, handkerchiefs), the skin (fingers) or a glass, a cup or a cigarette as regards the products for the lips. This results in a decrease, or even disappearance, of the make-up, thus making it necessary to freshen the application of the make-up composition regularly. Moreover, the appearance of unacceptable marks, in particular on shirt collars, can inhibit certain women from using this type of make-up.
In addition, the film obtained with these compositions may have a coarse feel or may not be sufficiently flexible, leaving the user with a sensation of discomfort and inconvenience.
The aim of the present invention is to provide a make-up or care composition for keratin substances that is easily applied and can give a film, which has good staying power and water resistance and which feels comfortable.
The inventors have discovered that the use of an aqueous suspension of particles of solid elastomeric polyorganosiloxane in a composition comprising an aqueous dispersion of particles of film-forming polymer makes it possible to obtain a composition which leads to the formation of a film that is entirely water-resistant. The film obtained also has transfer-resistance properties and has a matt appearance, thus giving the composition matt-effect properties. The composition feels comfortable to apply, spreads well and has a soft, non-sticky feel.
More specifically, a subject of the present invention is a composition to be applied to the skin and superficial body growths, comprising an aqueous dispersion of particles of film-forming polymer, characterized in that it further comprises an aqueous suspension of particles of at least partially crosslinked solid elastomeric polyorganosiloxane.
A subject of the invention is also a cosmetic process for the making up or for the non-therapeutic treatment of keratin substances, comprising applying a composition as defined above to the keratin substances.
A subject of the invention is also the use, in a cosmetic composition or for the manufacture of a topical composition, of an aqueous dispersion of film-forming polymer and of an aqueous suspension of solid particles of at least partially crosslinked elastomeric polyorganosiloxane, in order to obtain a film that is water-resistant and/or does not transfer and/or feels comfortable and/or gives a matt effect.
The term “elastomeric” refers to a flexible, deformable material that has viscoelastic properties, including the consistency of a sponge or flexible sphere. Its modulus of elasticity is such that this material withstands deformation and has a limited capacity for extension and contraction. This material is capable of regaining its original shape after having been stretched. This elastomer is formed from high molecular weight polymeric chains whose mobility is limited by a network of crosslinking points.
The elastomeric polyorganosiloxanes in accordance with the invention are partially or totally crosslinked, of three-dimensional structure, and in the form of powder suspended in water.
The elastomeric polyorganosiloxanes according to the invention can be chosen from the crosslinked polymers described in patent application JP-A-10/175 816 and U.S. Pat. No. 5,928,660, which are incorporated herein by reference. According to the patent, they are obtained by addition reaction and crosslinking in the presence of a catalyst, especially of the platinum type, of at least:
(a) one polyorganosiloxane (i) containing at least two vinyl groups in position &agr;, &ohgr; of the silicone chain per molecule; and
(b) one organosiloxane (ii) containing at least one hydrogen atom linked to a silicon atom per molecule.
In particular, the polyorganosiloxane (i) may be chosen from polydimethylsiloxanes and is more specifically an &agr;, &ohgr;-dimethylvinylpolydimethylsiloxane.
The elastomeric polyorganosiloxanes in the composition according to the invention are in the form of an aqueous suspension. This suspension can be obtained in particular as follows:
(a) mixing the polyorganosiloxane (i) and the organosiloxane (ii);
(b) adding the aqueous phase containing an emulsifier to the mixture from step (a);
(c) emulsifying the aqueous phase and the said mixture;
(d) adding hot water to the emulsion from phase (c); and
(e) polymerizing the polyorganosiloxane (i) and the organosiloxane (ii) of the emulsion in the presence of a platinum catalyst.
The water of step (d) is advantageously added at a temperature of 40-60° C. After step (e), it is possible to dry the particles obtained, in order to evaporate therefrom all or some of the water trapped.
The polyorganosiloxanes in the composition of the invention are, for example, those sold under the names BY 29-122 and BY 29-119 by the company Dow-Corning Toray. A mixture of these commercial products can also be used.
Preferably, the elastomeric polyorganosiloxane powder is present in the composition in a solids content ranging from about 0.5 to about 65% by weight, relative to the total weight of the composition, more preferably from about 3 to about 45% by weight, and better still from about 5% to about 30% by weight, and in any case in an amount, which is sufficient to increase the water-resistance of the composition.
Preferably, the particles of elastomeric polyorganosiloxane (as active material) can have a size ranging from about 0.1 to about 500 &mgr;m and better still from about 3 to about 200 &mgr;m. These particles can be spherical, flat, or amorphous, but preferably have a spherical shape.
According to the invention, the polyorganosiloxane particles are present in the composition in the form of an aqueous suspension; they are thus directly in suspension in the water. This water can be added to any composition, irrespective of its pharmaceutical form.
In order to be suspended stably in the water, these polyorganosiloxane particles can be combined with one or more nonionic, cationic, or anionic surfactants with an HLB≧8. Preferably,
Dudash Diana
Finnegan Henderson Farabow Garrett & Dunner LLP
Haghighatian Mina
L'Oreal (S.A.)
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