Drug – bio-affecting and body treating compositions – Live skin colorant containing – Lip
Reexamination Certificate
2001-08-15
2003-07-22
Webman, Edward J. (Department: 1617)
Drug, bio-affecting and body treating compositions
Live skin colorant containing
Lip
C424S063000, C424S401000, C514S844000
Reexamination Certificate
active
06596264
ABSTRACT:
The subject-matter of the present invention is a cosmetic composition which can take the form of an emulsion and is capable of being employed for the care or make-up of the skin, the semimucosae, the mucosae or the exoskeletal parts.
Cosmetic make-up compositions generally include fatty substances such as oils and waxes and a particulate phase generally made up of fillers and pigments. They can thus be, for example in the case of lip rouges, in the form of a stick or rod or in the form of a flexible paste. Make-up compositions can also include water or a hydrophilic phase and can then be especially in the form of oil-in-water or water-in-oil emulsion, multiple emulsion or aqueous solution or gel, especially when they are a make-up foundation, a tinted cream, a care cream or a sun care product.
It has been found that when these various cosmetic compositions are applied to the skin, the mucosae or the semimucosae, they have the disadvantage of transferring. This means that the composition is liable to be deposited, at least partially, on some substrates with which it comes into contact, such as, for example, a glass, a garment or the skin. On being deposited, the composition leaves a mark on the substrate. This therefore results in a mediocre tenacity of the composition on the skin or the mucosae, resulting in the need to renew its application at regular intervals.
Another disadvantage of these compositions lies in the problem of migration. It has been found, in fact, that some compositions have a tendency to propagate inside small wrinkles or wrinkles of the skin, in the case of foundations; in the small wrinkles which surround the lips, in the case of lip rouges, and in the folds of the eyelid in the case of eye shadows. It has also been found, especially in the case of eye shadows, that streaks appear in the make-up, which are generated by the movements of the eyelids. All these phenomena produce an unaesthetic effect which, quite obviously, the consumer wishes to avoid.
The objective of the present invention is to propose a composition which makes it possible to obtain a film which behaves very well, which does not transfer and which does not stain a substrate with which it might be in contact.
A first subject of the invention is therefore the use of at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% in a cosmetic, dermatological, hygienic or pharmaceutical composition in order to limit, reduce or eliminate the transfer or the migration of the said composition, or in order to improve the behavior of the said composition.
Another subject of the invention is the use of such a polymer as an agent making it possible to limit, reduce or eliminate the transfer or the migration of the said composition, or as an agent making it possible to improve the behaviour of the said composition.
Another subject of the invention is a cosmetic, dermatological, hygienic or pharmaceutical composition which is in the form of, or includes, an oil-in-water emulsion, a water-in-oil emulsion, a multiple emulsion or a multiphase solution additionally including at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and pigments.
Yet another subject of the invention is a cosmetic, dermatological, hygienic or pharmaceutical composition which is in the form of, or includes, an aqueous gel or an aqueous, hydroalcoholic or multiphase solution additionally including at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and water-soluble dyes.
Another subject of the invention is a transfer-free make-up or care composition including at least one such polymer.
The invention also has as a subject a process for limiting, reducing, or preventing the transfer of a cosmetic, dermatological, hygienic or pharmaceutical composition, especially a composition for make-up or care of the skin, of the mucosae, of the semimucosae or of the exoskeletal parts, comprising introducing into the composition at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90%.
It has in addition been found that the compositions according to the invention do not migrate in the course of time.
Furthermore, the compositions such as the products for care, hygiene or make-up which contain the polymer according to the invention spread uniformly over the local surface to be treated; the hair-care compositions spread and are distributed uniformly along the keratinous fibres and do not run onto the forehead, the back of the neck or the face or into the eyes. This is especially due to the polymer employed which, by virtue of its specific properties of its thickening or gelling agent, makes it possible to obtain a very large number of cosmetic formulations containing substrates of different nature.
In addition, the compositions according to the invention withstand the conventional and specific cosmetic active substances, especially hydroxy acids.
Finally, their cosmetic properties are very advantageous: they provide a certain coolness when applied, as well as great softness.
The compositions according to the invention therefore include at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90%. This crosslinked and practically or completely neutralized poly(2-acrylamido-2-methylpropanesulphonic acid) polymer is generally water-soluble or swellable in water.
These polymers are in general characterized in that they comprise, distributed randomly:
(a) from 90 to 99.9% by weight, relative to the weight of said at least one crosslinked polymer, of units of the following formula (1):
in which X
+
denotes a cation or a mixture of cations, it being possible for at most 10 mol % of the cations X
+
to be protons H
+
, and
b) from 0.01 to 10% by weight, relative to the weight of said at least one crosslinked polymer, of crosslinking units originating from at least one monomer containing at least two olefinic double bonds.
The polymers of the invention preferably comprise a number of units of formula (1) in a quantity which is sufficiently large to obtain polymer particles whose hydrodynamic volume in water solution has a radius ranging from 10 to 500 nm and whose distribution is homogeneous and unimodal.
The hydrodynamic volume is determined by the diffusion coefficient D according to Stokes-Einstein according to the method for characterizing a mixture of polymers by laser diffusion, as described in the paper by Chi Wu et al., Macromolecules, 1995, 28, 4914-4919.
The polymers according to the invention which are more particularly preferred include from 98 to 99.5% by weight of units of formula (1) and from 0.2 to 2% by weight of crosslinking units.
The cation X
+
denotes a cation or a mixture of cations which are chosen in particular from a proton, an alkali metal cation, a cation equivalent to that of an alkaline-earth metal or the ammonium ion. The preferred cation X
+
is the NH
4
+
cation. More particularly, 90 to 100 mol % of the cations are NH
4
+
cations and 0 to 10 mol % are protons (H
+
).
The crosslinking monomers which have at least two olefinic double bonds are selected, for example, from dipropylene glycol diallyl ether, polyglycol diallyl ether, triethylene glycol divinyl ether, hydroquinone diallyl ether, tetraallyloxyethanoyl or other allyl or vinyl ethers, polyfunctional alcohol, tetraethylene glycol diacrylate, triallylamine, trimethylolpropane diallyl ether, methylenebisacrylamide or divinylbenzene.
The crosslinking monomers which contain at least two olefinic double bonds are more preferably selected from those corresponding to the following formula (2):
in which R
1
denotes a hydrogen atom or a C
1
-C
4
alkyl radical. The crosslinking monomers are most preferably (trimethylolpropane triacrylate).
The polymerization reaction of the polymers of the invention produces not only linear chains but also branched or crosslinked p
Favre Sophie
Terren Nadia
Finnegan Henderson Farabow Garrett & Dunner LLP
L'Oreal SA
Webman Edward J.
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