Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2000-02-14
2001-06-12
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C424S401000, C424S070100
Reexamination Certificate
active
06245322
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present application relates to a fluid composition in the form of an oil-in-water emulsion comprising at least one acrylic terpolymer and to the use of the composition, in particular for caring for, removing make-up from, cleansing and/or scenting the skin of the body or the face, the hair and/or the lips and for impregnating fabrics intended for cleansing and/or removing make-up from the skin, lips and/or eyes.
2. Description of the Background
For various reasons related especially to a better comfort of use (softness, emollience and others), current cosmetic compositions are generally provided in the form of an emulsion of the oil-in-water (O/W) type composed of a continuous aqueous dispersing phase and of a non-continuous oily dispersed phase or of an emulsion of the water-in-oil (W/O) type composed of a continuous oily dispersing phase and of a non-continuous aqueous dispersed phase. O/W emulsions are in the greatest demand in the cosmetics field because they comprise an aqueous phase as an external phase, which confers on them, during application to the skin, a fresher, less greasy and lighter feel than W/O emulsions.
The emulsions are generally stabilized by appropriate emulsifying surfactants which, by virtue of their amphiphilic structure, become positioned at the oil/water interface and thus stabilize the dispersed droplets. However, these emulsifiers exhibit the disadvantage of being penetrating and potentially irritating to the skin, eyes and scalp, in particular for users with sensitive skin.
In addition, in these conventional emulsions which comprise emulsifying surfactants, the size of the oily globules is generally greater than several microns. Such emulsions can have inadequate cosmetic and physicochemical properties (oily feel, instability over time). Increasing the level of the surfactants does not generally solve the problems discussed above. The stability required is not always achieved and the cosmetic properties are not improved (waxy and heavy feel, lack of freshness on application). Furthermore, as indicated above, it is also inadvisable to use an excessively high level of surfactant for reasons of harmlessness.
A solution in order to achieve freedom from the phenomena of instability of O/W emulsions (creaming and phase separation) consists in adding thickening agents to the emulsion, the role of which thickening agents is to create, within the aqueous phase, a gelled matrix which serves to set the oily droplets and which provides for mechanical maintenance of the entire emulsion. However, this solution exhibits the disadvantage of not making it possible to obtain all the desired textures and in particular fluid and light textures which are readily and rapidly applied to the skin without leaving a residual film.
Furthermore, the replacement of the surfactants by polymers comprising, 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, such as the product “Pemulen TR2” sold by Goodrich, has been envisaged. However, these polymers exhibit the disadvantage of not making it possible to obtain compositions which are sufficiently fluid to be able to be vaporized.
SUMMARY OF THE INVENTION
It is an object of the invention is to be able to prepare very fluid and stable oil-in-water emulsions which optionally do not comprise emulsifying surfactant conventionally used in O/W emulsions and which exhibit good cosmetic properties without having the disadvantages of compositions described above.
The Inventors have discovered, unexpectedly, a novel family of polymers allowing such emulsions to be produced.
These polymers make it possible to prepare oil-in-water emulsions over a wide range of viscosity and of content of oily phase which remain stable over time at room temperature or at higher temperatures.
Thus, the present invention thus relates to a fluid composition in the form of an oil-in-water emulsion comprising, in a physiologically acceptable medium, an oily phase dispersed in an aqueous phase, comprising up to 0.5% by weight of active material with respect to the total weight of the composition of at least one acrylic terpolymer obtained from
(a) an &agr;,&bgr;-ethylenically unsaturated carboxylic acid,
(b) a non-surface-active ethylenically unsaturated monomer other than (a), and
(c) a non-ionic urethane monomer which is the reaction product of a monohydric non-ionic amphiphilic compound with a monoethylenically unsaturated isocyanate.
The present invention also relates to a method of caring for, removing make-up from, cleansing and/or scenting the skin, lips and/or hair, comprising applying the inventive composition to the skin, lips and/or hair.
The present invention also relates to a cleansing wipe comprising a fabric impregnated with the inventive composition.
The present invention also relates to a method of making the cleansing wipe of claim
17
, comprising impregnating a fabric with the inventive composition.
The present invention also relates to a method of cosmetically treating the skin, hair and/or lips, comprising applying the inventive composition to the skin, hair and/or lips.
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.
DETAILED DESCRIPTION OF THE INVENTION
The composition obtained generally has a homogeneous texture which is pleasant on application while being stable on storage. Furthermore, it is very fluid. The viscosity of the emulsions generally ranges from 0.02 to 3 Pa·s, this viscosity being measured at approximately 25° C. using a “Rheomat 180” viscometer equipped with a 2 rotor. This range for the viscosity includes all specific values and subranges therebetween, such as 0.05, 0.1, 0.2, 0.5, 1 and 2 Pa·s.
The emulsion of the invention is advantageously devoid of surfactant conventionally used in O/W emulsions and it exhibits, for this reason, the advantage of not being irritating to particularly sensitive skin. In addition, this emulsion exhibits the advantage of making possible the incorporation of heat-sensitive active principles because it can be manufactured at room temperature, both in the stage of neutralization of the polymer and in the stage of dispersion of the oily phase.
The acrylic terpolymer used in accordance with the invention is soluble or swellable in alkaline substances. It is preferably characterized in that it comprises, with respect to the total weight of the terpolymer:
(a) Approximately 20 to 70% by weight, preferably 25 to 55% by weight, of a carboxylic acid comprising &agr;,&bgr;-monoethylenic unsaturation. These ranges include all specific values and subranges therebetween, such as 30, 35, 45, 60 and 65% by weight;
(b) Approximately 20 to 80% by weight, preferably 30 to 65% by weight, of a non-surface-active monomer comprising monoethylenic unsaturation other than (a). These ranges include all specific values and subranges therebetween, such as 25, 35, 40, 45, 50, 60, 70 and 75% by weight; and
(c) Approximately 0.5 to 60% by weight, preferably 10 to 50% by weight, of a non-ionic urethane monomer which is the reaction product of a monohydric non-ionic amphiphilic compound with an isocyanate comprising monoethylenic unsaturation. These ranges include all specific values and subranges therebetween, such as 1, 2, 5, 15, 25, 30, 40 and 55% by weight.
The carboxylic acid comprising &agr;,&bgr;-monoethylenic unsaturation (a) can be chosen from numerous acids and in particular acrylic acid, methacrylic acid, crotonic acid, itaconic acid and maleic acid. It is preferably methacrylic acid. A large proportion of acid is preferable in order to give a polymer structure which dissolves and gives a thickening agent by reaction with an alkaline compound, such as sodium hydroxide, alkanolamines, aminomethylpropanol or aminomethylpropanediol.
The terpolymer comprises a monomer (b) comprising monoe
Dodson Shelley A.
George Konata M.
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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