Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2003-01-09
2004-03-02
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C424S060000, C424S400000, C424S401000
Reexamination Certificate
active
06699462
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to cosmetic and/or dermatological compositions intended for artificially coloring the skin, characterized in that they comprise, in a cosmetically acceptable vehicle, at least one sorghum extract; the said compositions not containing a flavylium salt which is unsubstituted in position 3 and which is substituted with at least one hydroxyl or alkoxy radical.
The invention also relates to its uses for the manufacture of cosmetic or dermatological compositions for coloring the skin.
2. Description of the Prior Art
Nowadays, it is important to look healthy and a tanned skin is always a sign of good health. However, a natural tan is not always desirable since it requires prolonged exposure to UV radiation, in particular to UV-A radiation which causes the tanning of the skin but, however, is liable to induce an adverse change therein, in particular in the case of sensitive skin or of skin which is continually exposed to solar radiation. It is thus desirable to find an alternative to a natural tan which is compatible with the requirements of such skin types.
Most of the cosmetic products intended for artificially tanning the skin are based on carbonyl derivatives which, by interacting with the amino acids in the skin, allow the formation of colored products.
To this end, it is known that dihydroxy-acetone, or DHA, is a particularly advantageous product which is commonly used in cosmetics as an agent for artificially tanning the skin; when applied to the skin, in particular to the face, it gives a tanning or bronzing effect which is similar in appearance to that which may result from prolonged exposure to sunlight (a natural tan) or under a UV lamp.
A drawback of DHA is the length of time the coloration takes to develop: specifically, several hours (3 to 5 hours in general) are required for the coloration to be revealed. There is thus an increasing demand for fast-acting self-tanning products which give a coloration closer to that of a natural tan.
Thus, efforts are continually being made to find novel compounds and novel compositions which can give the skin an artificial coloration close to that of a natural tan in a simple, effective, fast and risk-free manner.
Sorghum extracts have been known for a long time as food colorants. They give a reddish brown color and have in their composition flavonoids, anthocyanidins and tannins.
SUMMARY OF THE INVENTION
Now, after considerable research conducted in the field of artificial coloring of the skin, the Applicant has discovered that the use as skin-coloring agent of at least one sorghum extract, in the absence of a flavylium salt which is unsubstituted in position 3 and which is substituted with at least one hydroxyl or alkoxy radical, makes it possible to give the skin, immediately after applying the product to it, an artificial coloration close to that of a natural tan.
The subject of the present invention is therefore a novel cosmetic and/or dermatological composition, intended for artificially coloring the skin close to a natural tan, characterized in that it comprises, in a cosmetically acceptable vehicle, at least one sorghum extract; the said composition not containing a flavylium salt which is unsubstituted in position 3 and which is substituted with at least one hydroxyl or alkoxy radical.
A subject of the present invention is also the novel use of at least one sorghum extract in a cosmetic composition not containing a flavylium salt which is unsubstituted in position 3 and which is substituted with at least one hydroxyl or alkoxy radical, with the aim of giving the skin an artificial coloration close to that of a natural tan.
A subject of the present invention is also a process for giving the skin an artificial coloration close to that of a natural tan, characterized in that it consists in applying to the skin an effective amount of a cosmetic composition as defined above.
The compositions and uses in accordance with the invention make it possible to obtain an artificial coloration close to that of a natural tan in a short space of time. Thus, an immediate coloration is obtained, which allows the application to be visualized and consequently allows more uniform spreading of the composition on the skin and thus of the resulting coloration. Moreover, the artificial coloration obtained on the skin according to the invention is extremely close to that of a natural tan.
For the purposes of the present invention, the expression “composition intended for artificially coloring the skin” will be understood to mean a formulation with a particular affinity for the skin which allows it to give the skin a long-lasting coloration, which is non-covering (that is to say which does not have a tendency to opacify the skin) and which is not removed either with water or with a solvent, and which withstands both rubbing and washing with a solution containing surfactants. Such a long-lasting coloration is thus distinguished from the superficial and transient coloration provided, for example, by a make-up product.
Other characteristics, aspects and advantages of the present invention will become apparent on reading the detailed description which follows.
DETAILED DESCRIPTION OF BEST MODE AND SPECIFIC/PREFERRED EMBODIMENTS OF THE INVENTION
The compositions in accordance with the present invention make it possible to obtain, 30 minutes after application to a fair skin at a rate of 2 mg/cm
2
, a darkening characterized in the (L*, a*, b*) calorimetric measuring system by a &Dgr;L* ranging from −0.5 to −20. Preferably, &Dgr;L* will range from −0.5 to −15.
The compositions in accordance with the present invention give, 30 minutes after application to a fair skin at a rate of 2 mg/cm
2
, a coloration defined in the (L*, a*, b*) calorimetric measuring system by a ratio &Dgr;a*/&Dgr;b* ranging from 0.5 to 3 and even more particularly ranging from 0.8 to 2.
According to the present invention, the term “fair skin” means an untanned skin whose calorimetric characteristics may be defined by its ITA angle as defined in the publication by A. Chardon et al., “Skin Color Typology and Suntanning Pathways” presented at the 16th IFSCC congress, Oct. 8-10, 1990, New York, and in
Int. J. Cosm. Sci.
13 191-208 (1991). The fair skins as defined in this classification have an ITA angle of between 35 and 55.
In the (L*, a*, b*) calorimetric measuring system:
L* represents the luminance or clarity, a* represents the red-green axis (−a*=green, +a*=red) and b* represents the yellow-blue axis (−b*=blue, +b*=yellow). Thus, a* and b* express the shade of the skin.
&Dgr;L* reflects the darkening of the color: the more negative the &Dgr;L*, the darker the color, with:
&Dgr;
L*=L
* uncolored skin−
L
* colored skin.
The ratio &Dgr;a*/&Dgr;b* reflects the red/yellow balance and thus the shade, with:
&Dgr;
a*=a
* uncolored skin−
a
* colored skin
&Dgr;
b*=b
* uncolored skin−
b
* colored skin.
The sorghum extracts in accordance with the invention are obtained from the whole plant, the stems, the seeds or the leaves of the genus Sorghum. The preferred species of sorghum are chosen from
Sorghum bicolor, Sorghum caudatum, Sorghum nervosum, Sorghum durra, Sorghum vulgare
and the Sorghum species in association with
Colletotrichum graminicola.
The sorghum extracts in accordance with the invention are more particularly the extracts of
Sorghum vulgare
such as the commercial product Sorghum Extract Absorbance>30 sold by Premier Specialties.
The sorghum extracts in accordance with the invention are obtained from the extraction of the whole plant or of the plant parts cited above which may be in the fresh state or in the dry state.
The sorghum extract in accordance with the invention may be obtained by a process comprising the following steps:
(a) an extraction of the whole plant, the stems, the seeds or the leaves of the genus Sorghum in an aqueous medium which may also contain at le
Candau Didier
Elguidj Irène
Seyler Nathalie
Burns Doane Swecker & Mathis L.L.P.
Dodson Shelley A.
Societe L'Oreal S.A.
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