Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2000-02-08
2002-06-11
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S860000, C524S861000, C524S862000, C528S015000, C528S031000, C528S032000, C525S474000, C525S478000, C514S844000, C514S845000, C514S846000, C514S937000, C424S401000
Reexamination Certificate
active
06403704
ABSTRACT:
The present invention relates to a care composition and/or a make-up composition for the skin and/or lips of human beings which has not only matte-effect and freshness properties, but also water-resistance properties. Such compositions may be in the form of a lip composition, an eyeliner, a face powder, an eye-shadow, a foundation, an anti-sun product, a deodorant, or a treatment shampoo, in the form of an aqueous gel, a lotion or a cream, or cast as a stick or as a dish.
The known lip and foundation compositions generally comprise fatty substances such as oils, pasty compounds and waxes, as well as a particulate phase generally composed of fillers and pigments. The fillers generally serve to modify the texture of the composition, as well as to give a matte-effect to the film or coat of composition applied to the skin and/or the lips, while the pigments generally serve to bring color to the composition.
A matte-effect is particularly desired for users with combination or greasy skin, as well for use in hot and humid climates. Matte-effect fillers are usually absorbent fillers such as talc, silica, kaolin or fillers which have optical properties of scattering light, these properties being known as the “soft focus” effect.
As taught in European patent application no. EP-A-790 055, matte-effect polymers, such as crosslinked silicone polymers known under the commercial references KSG (KSG 6, 16, 17 and 18) from the company Shin Etsu, Trefils from the company Dow Corning, or Gransils from the company Grand Industrie, have recently been used is cosmetic compositions.
The drawback with these commercial products is that they contain linear or cyclic silicone oils of the non-crosslinked polydimethylsiloxane (PDMS) type, which give an oily, greasy effect and do not feel fresh. Accordingly, it is difficult or impossible to use the resulting products in a hot and humid environment and/or by users with greasy skin. Furthermore, these commercial products, even those which are free of silicone oil (Trefils 505 C from Dow Corning, for example) are difficult to disperse in an aqueous medium. On account of their high incompatibility with water, these polymers have excellent properties of water-resistance or water-remanence, and are presented as “water-insoluble” elastomeric silicone polymers. See, for example, European patent application no. EP-A-0 855 178. Such properties allow elastomeric silicone polymers to be used in so-called “waterproof” compositions, in particular waterproof mascara, eye-liner or anti-sun compositions, the latter being particularly sought after by consumers on holiday by the sea or next to a body of water.
However, the matte-effect power of these polymers has a tendency to fade away over time, once again leading to shiny and greasy effects on the skin, which are aesthetically unattractive. As taught in U.S. Pat. No. 5,412,004 to Kose and U.S. Pat. No. 5,599,533 to Estée Lauder, in order to improve their cosmetic properties, emulsions have recently been formulated containing this type of polymer. Although they have a more fresh and less greasy effect than anhydrous products, these stable emulsions lose their matte-effect property initially provided by the crosslinked silicone polymers.
Compounds of the crosslinked organosiloxane type which can be dispersed in aqueous medium exist. For example, KSG 20 or KSG 21 sold by the company Shin Etsu, exhibit a specific chemical structure that allows it to be dispersed in an aqueous medium. Specifically, the presence of polar groups give the resulting compounds surfactant properties. However, these compounds, unlike those of the composition of the invention, do not provide any particular matte-effect or freshness.
Moreover, the company Procter & Gamble has envisaged, in its International patent application no. WO-A-96/36323, mascara compositions of the water-in-oil emulsion type which are long-lasting, show water resistance and leave no traces. These compositions contain, inter alia, an aqueous polymer dispersion, generally known as a latex, combined with a surfactant of the alkyl or alkoxy dimethicone copolyol type, hydrocarbon-based oils, pigments and fillers, as well as waxes. However, these mascara compositions are unsuitable for use on the skin, because after the water has evaporated, they form a continuous film on the skin which leads to tautness and discomfort, particularly dryness.
The need thus remains for a water-resistant matte-effect composition whose properties persist on the skin over time and which at the same time provide freshness and comfort.
The Inventor has surprisingly discovered that the introduction of particles of a specific polyorganosiloxane into a composition for topical application, and more especially a care composition or a make-up composition for the skin or the lips, makes it possible to overcome the above-described drawbacks. Specifically, the inventive compositions make it possible to obtain a water-resistant film whose cosmetic properties are better than those of the water-resistant products of the prior art. In particular, the present invention provides a water-resistant film that exhibits properties that are superior to those of the prior art, e.g., improved properties related to ease of application, e.g., slipperiness, tautness, dryness, specifically on the lips, freshness, as well as the ability to provide a matte effect.
The invention applies not only to make-up products for the lips and skin of human beings, but also to care products and/or treatment products for human lips and skin. The composition of the invention can also be in the form of a topical composition, which can be applied to the scalp, i.e., areas of superficial keratinous growths, for example.
Thus, one object of the present invention is a composition for cosmetic or topical application comprising particles of an at least partially crosslinked elastomeric solid polyorganosiloxane suspended in an aqueous phase that exhibits improved water-resistance.
Still another object of the present invention is a composition for cosmetic or topical application comprising particles of an at least partially crosslinked elastomeric solid polyorganosiloxane suspended in an aqueous phase that provides a water-resistant make-up or care composition for keratin substances.
Another object of the invention is a process for increasing the water-remanence of a cosmetic composition, which comprises introducing into the composition, by mixing, for example, particles of an at least partially crosslinked elastomeric polyorganosiloxane suspended in an aqueous phase.
It is entirely surprising that the composition is water-resistant although it comprises a continuous aqueous phase. At the present time, no commercially available water-resistant cosmetic product exists which has a continuous aqueous phase.
The term “elastomeric” means a flexible, deformable material which has viscoelastic properties and in particular the consistency of a sponge or a flexible sphere. Its modulus of elasticity is such that this material withstands deformation and has a limited capacity for stretching and contracting. This material is capable of regaining its original shape after it has been stretched. This elastomer is formed from high molecular weight polymer chains whose mobility is limited by a uniform network of crosslinking points.
The elastomeric polyorganosiloxanes of the composition of the invention have properties of structuring an aqueous medium and are capable of increasing the viscosity of the aqueous phase. They do not dry out the skin and provide good cosmetic properties, in particular softness, freshness and a matte effect. These novel elastomers lead to compositions which feel comfortable when applied, spread well, and feel soft and non-sticky to the touch. These cosmetic properties are due both to the texture of the polyorganosiloxanes and to their properties which are comparable to those of microsponges, which trap aqueous media, particularly those of the composition and those due to the perspiration of the skin. They thus make it possible to obtain thickened c
Dawson Robert
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
Robertson Jeffrey B.
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