Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-05-26
2002-10-15
Webb, Gregory E. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S130000, C510S417000, C424S070100, C424S070120, C514S063000
Reexamination Certificate
active
06465402
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present application relates to a composition, and particularly a cosmetic composition, in the form of an oil-in-water emulsion that contains a crosslinked solid organopolysiloxane elastomer having at least one oxyalkylene group and a polymer which is soluble or swellable in water. The application also relates to the use of the composition, particularly in the cosmetics field, and to the use of the combination of the solid organopolysiloxane elastomer and of the polymer which is soluble or swellable in water for the stabilization of an oil-in-water emulsion.
2. Discussion of the Background
For reasons related mostly to comfort of use (softness, emollience and others), current cosmetic compositions are generally provided in the form of an oil-in-water (O/W) emulsion (composed of a continuous aqueous dispersing phase and a non-continuous oily dispersed phase) or a water-in-oil (W/O) emulsion (composed of a continuous oily dispersing phase and a non-continuous aqueous dispersed phase). In the cosmetics field, O/W emulsions are typically more in demand because they include an aqueous phase as the external phase, and the aqueous phase confers upon the composition a fresher, less greasy and lighter feel than W/O emulsions during application to the skin.
The emulsions are generally stabilized by appropriate emulsifying surfactants which, by virtue of their amphiphilic structure, reside at the oil/water interface and thus stabilize the dispersed droplets. These emulsifiers exhibit the disadvantage, however, of penetrating and potentially irritating the skin, eyes and scalp. This is particularly the case for subjects with sensitive skin.
In addition, such emulsions often have inadequate cosmetic and physicochemical properties, e.g., they can have an oily feel and are unstable over time. Increasing the level of surfactants does not generally solve these problems. The required stability is not always achieved, and the cosmetic properties are not improved (the composition exhibits a waxy and heavy feel and a lack of freshness on application). Moreover, as indicated above, it is also inadvisable to use an excessively high level of surfactant, to ensure harmlessness.
One solution for increasing the stability of O/W emulsions (i.e., to reduce creaming and phase separation) is to add thickening agents to the emulsion. The thickening agents create, within the aqueous phase, a gelled matrix. The gelled matrix serves to set the oily droplets and mechanically maintains the entire emulsion. However, it is impossible to obtain with this solution all the desired textures and particularly the light textures which are readily and rapidly applied to the skin without leaving a residual film.
Replacing the surfactants by polymers having, in their chain, a hydrophilic part and a hydrophobic part composed of a fatty chain, such as copolymers of (C
10
-C
30
)alkyl acrylate and of acrylic or methacrylic acid, has been proposed. An example of such a polymer includes the product “Pemulen TR2” sold by Goodrich. However, these polymers undesirably impart a sticky effect when applied to the skin, and it is not possible to obtain a composition which remains stable for a long period of time when the amount of oil is too high.
EP-A-815,844 discloses the use of a crosslinked and neutralized polymer of 2-acrylamido-2-methylpropanesulphonic acid in producing surfactant-free emulsions. However, the emulsions obtained are not completely stable in the presence of a high level of oily phase, for example greater than 12%.
SUMMARY OF THE INVENTION
Accordingly, one object of the invention is to prepare stable oil-in-water emulsions.
Another object of the invention is to prepare stable oil-in-water emulsions that do not exhibit phase separation or release of oil.
Another object of the invention is to prepare stable oil-in-water emulsions that do not depend on emulsifying surfactants conventionally used in O/W emulsions.
Another object of the invention is to prepare stable oil-in-water emulsions that exhibit good cosmetic properties without having the disadvantages of the prior art, whatever the amount of oil present in the emulsion.
These and other objects have been attained with the present invention, the first embodiment of which provides an oil-in-water emulsion composition, including:
an oily phase dispersed in an aqueous phase;
wherein the oily phase includes at least one crosslinked solid organopolysiloxane elastomer having at least one oxyalkylene group; and
wherein the aqueous phase includes at least one polymer which is soluble or swellable in water.
Another embodiment of the present invention provides a cosmetic composition, including the above-noted composition according to the invention and a physiologically acceptable medium.
Another embodiment of the present invention provides a method of using the above-noted composition according to the invention for treating, protecting, caring for, removing make-up from and/or cleansing the skin, lips and/or hair and/or for making up the skin and/or lips.
Another embodiment of the present invention provides a process for the cosmetic treatment of the skin, of the hair and/or of the lips, including applying the above-noted composition according to the invention to the skin, hair and/or lips.
Another embodiment of the present invention provides a method of using the above-noted composition according to the invention in the manufacture of a composition for caring for dry skin and/or dry lips.
Another embodiment of the present invention provides a method of stabilizing an oil-in-water emulsion, including preparing an oil-in-water emulsion with at least one a crosslinked solid organopolysiloxane elastomer and at least one polymer which is soluble or swellable in water.
The present invention makes it possible to prepare oil-in-water emulsions which are stable even though they optionally may not contain conventionally used surfactants, this stability persisting even when the level of oily phase is high. Furthermore, the present invention provides compositions that are advantageously fresh and comfortable during application to the skin, which effects are otherwise not obtained with conventional compositions.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description.
Preferably, the invention relates to the use of a combination of a crosslinked solid organopolysiloxane elastomer and of a polymer which is soluble or swellable in water, in particular a crosslinked and neutralized poly(2-acrylamido-2-methylpropanesulphonic acid) polymer. The emulsion obtained is stable, even when it is devoid of an emulsifying surfactant conventionally used in O/W emulsions.
Preferably, the term “physiologically acceptable medium” is understood to mean, in the composition of the invention, a nontoxic medium capable of being applied to the skin (including the inside of the eyelids), the lips, the nails or the hair of human beings.
Preferably, the term “solid elastomer” is understood to mean a flexible and deformable material having viscoelastic properties and in particular the consistency of a sponge or of a flexible sphere. Its modulus of elasticity is such that this material is resistant to deformation and has a limited ability to expand and to contract. This material is capable of returning to its original shape after it has been stretched. This elastomer is formed of polymeric chains of high molecular weight, the mobility of which is limited by a uniform network of crosslinking points.
Preferably, the oily phase contains at least one crosslinked solid organopolysiloxane elastomer having at least one oxyalkylene group, and the aqueous phase contains at least one polymer that is swellable or soluble in water.
The oxyalkylenated organopolysiloxane elastomers used in the composition of the invention are known for allowing the preparation of a W/O emulsion and it i
L'Oreal
Webb Gregory E.
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