Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2001-07-11
2003-03-25
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
06537528
ABSTRACT:
The present invention relates to cosmetic and/or dermatological compositions for artificially coloring the skin, comprising, for example, in a cosmetically acceptable support; at least one self-tanning agent chosen from monocarbonyl compounds and polycarbonyl compounds and at least one flavylium salt compound which is unsubstituted in position 3, which is substituted with at least one radical chosen from hydroxyl and alkoxy radicals, wherein the at least one flavylium salt compound may be obtained, for example, in a manner chosen from synthetically, from a plant extract containing it, and from an enriched plant extract containing it.
The invention also relates to the use of the composition for coloring the skin.
Nowadays, it is important to look healthy, and a tanned skin is always a sign of good health. However, a natural tan may not always be desirable since it requires long exposure to UV radiation, for example to UV-A radiation which causes the tanning of the skin. UV-A radiation is also liable to induce an adverse change of the skin, for example in the case of sensitive skin or skin which is continually exposed to solar radiation. It may thus be desirable to find an alternative to a natural tan which may be compatible with the requirements of such skin types.
Most of the cosmetic products intended for artificially tanning the skin are based on monocarbonyl and polycarbonyl compounds which, by interacting with the amino acids in the skin, allow the formation of colored products.
To this end, it is known that dihydroxyacetone, or DHA, is a product which is commonly used in cosmetics as an agent for artificially tanning the skin. When applied to the skin, for example to the face, it gives a tanning or bronzing effect which may be similar in appearance to that which may result from prolonged exposure to sunlight (a natural tan) or under a UV lamp.
One drawback of DHA can be the length of time the coloration takes to develop. Specifically, several hours (3 to 5 hours in general) may be required for the coloration to be revealed. Furthermore, the coloration produced on the skin by DHA may often be considered as too yellow by users.
Thus, efforts are still under way to find novel compounds and novel compositions which can give the skin an artificial coloration, for example, close to that of a natural tan, in at least one of a simple, effective, fast, and risk-free manner.
Anthocyanin colorants have been known for a long time as pharmaceutical and food colorants. These anthocyans may be present in nature in the form of heterosides known as anthocyanosides and genins, known as anthocyanidines. These anthocyans may be phenyl-2-benzopyrylium derivatives and flavylium derivatives and may be present, for example, in the plant in the form of salts. Anthocyans may be red-, violet- or blue-colored compounds which generally color flowers, fruit, and occasionally leaves. The color observed may depend both on the structure of the predominant genin and on the conditions of the medium in which the anthocyanin colorants are present.
Now, after considerable research conducted in the field of artificial coloring of the skin, the Inventors have discovered that the combination of at least one self tanning agent chosen from monocarbonyl compounds and polycarbonyl compounds, for example DHA, and at least one flavylium salt compound unsubstituted in position 3, may give the skin, after the product has been applied thereto, an artificial coloration, for example, a coloration close to that of a natural tan. Specifically, the Inventors have found that the combination may make it possible to obtain, compared with a self-tanning agent of the carbonyl type for example DHA used alone, an increase in color on the skin in a much shorter time (for example after 30 minutes). Furthermore, the combination may make it possible to obtain a shade which may be close to that of a natural tan and which may be stable over time.
One subject of the present invention is thus a novel cosmetic and/or dermatological composition for giving the skin an artificial coloration, for example, close to that of a natural tan, comprising, for example, in a cosmetically acceptable support, at least one self-tanning agent chosen from monocarbonyl compounds and polycarbonyl compounds, and at least one flavylium salt compound which is unsubstituted in position 3 and which is substituted with at least one radical chosen from hydroxyl and alkoxy radicals, wherein the at least one flavylium salt compound may be, for example, obtained in a manner chosen from synthetically, from a plant extract containing it, and from an enriched plant extract containing it.
A subject of the present invention is also the novel use of the combination of at least one self-tanning agent chosen from a monocarbonyl compound and a polycarbonyl compound, and at least one flavylium salt compound which is unsubstituted in position 3 and which is substituted with at least one radical chosen from hydroxyl and alkoxy radicals, for example, obtained in a manner chosen from synthetically, from a plant extract containing it, and from an enriched plant extract containing it, in cosmetic and/or dermatological compositions, with the aim of giving the skin an artificial coloration, for example, close to that of a natural tan.
A subject of the present invention is also a process for giving the skin an artificial coloration, for example, close to that of a natural tan, comprising applying to the skin an effective amount of a combination of at least one self-tanning agent chosen from monocarbonyl compounds and polycarbonyl compounds, and at least one flavylium salt compound which is unsubstituted in position 3 and which is substituted with at least one radical chosen from hydroxyl and alkoxy radicals, obtained, for example, in a manner chosen from synthetically, from a plant extract, and from an enriched plant extract, in a cosmetic composition.
The composition and uses in accordance with the invention may make it possible to obtain an artificial coloration, for example, close to that of a natural tan, in a very short space of time. Thus, an immediate coloration may be obtained, which may allow at least one of the following properties: visualization of the application, and better homogeneity in the spreading of the composition on the skin and thus of the resulting coloration. Furthermore, the artificial coloration obtained on the skin according to the invention may be 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. The formulation may be at least one of non-covering (does not have a tendency to opacify the skin), not removed either with water or with a solvent, and able to withstand both rubbing and washing with a solution containing surfactants. Such a long-lasting coloration may thus be distinguished from the superficial and transient coloration provided, for example, by a make-up product.
Other characteristics, aspects and advantages of the present invention, at least one of which may be present in a specific embodiment, will become apparent on reading the detailed description which follows.
For example, the composition, in accordance with the present invention, may, for example, generally lead, 30 minutes after application to a fair skin at a rate of 2 mg/cm
2
, to a darkening characterized in the (L*, a*, b*) calorimetric measuring system by a &Dgr;L* ranging from −0.5 to −20. For example, &Dgr;L* may range from −0.5 to −15.
For example, the composition, in accordance with the present invention, may give, 30 minutes after application to the skin at a rate of 2 mg/cm
2
, a coloration on a fair skin which may be defined in the (L*, a*, b*) colorimetric measuring system, by a ratio &Dgr;a*/&Dgr;b* ranging from 0.5:1:3:1, and for example ranging from 0.8:1:2:1.
According to the present invention, the term “fair
Candau Didier
Forestier Serge
Dodson Shelley A.
Finnegan Henderson Farabow Garrett & Dunner LLP
L'Oreal (S.A.)
LandOfFree
COMPOSITION COMPRISING AT LEAST ONE SELF-TANNING AGENT... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with COMPOSITION COMPRISING AT LEAST ONE SELF-TANNING AGENT..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and COMPOSITION COMPRISING AT LEAST ONE SELF-TANNING AGENT... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3026166