Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2001-07-11
2002-10-29
Dodson, Shelly A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C424S060000, C424S400000, C424S401000
Reexamination Certificate
active
06471949
ABSTRACT:
The present invention relates to cosmetic and/or dermatological compositions for artificially coloring the skin, which comprise, in a cosmetically acceptable support, at least one compound capable of screening out ultraviolet radiation 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 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 these compositions 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 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 and of skin which is continually exposed to solar radiation. It is thus 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 (“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, DHA can have an annoying tendency, which is more or less pronounced depending on the nature of the medium in which it is formulated, to degrade over time. This degradation is generally reflected in the long run by an undesirable yellowing of the compositions containing it. The result of such a phenomenon is that the activity of DHA, such as its ability to color the skin, may be reduced when these compositions are applied to the skin. Thus, the intensity of the coloration and the staying power of the coloration over time that are obtained on the skin may be unsatisfactory.
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. It is also sought to obtain a coloration which is at least one of more homogeneous and longer-lasting.
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 plants in the form of salts. Anthocyans may be red-, violet- and 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 Inventorss have discovered that the combination of at least one agent for screening UV radiation chosen from organic and mineral agents and of at least one flavylium salt compound unsubstituted in position 3, may, for example, immediately give the skin, after the product has been applied thereto, an artificial coloration, for example, close to that of a natural tan. Furthermore, the said combination may make it possible to obtain a shade which is is at least one of more uniform and longer-lasting than a self-tanning agent of the carbonyl type, such as DHA.
One subject of the present invention is thus novel cosmetic and/or dermatological compositions for giving the skin an artificial coloration, for example, close to that of a natural tan, comprising, in a cosmetically acceptable support, at least one agent for screening out UV radiation chosen from organic and mineral agents 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.
Another subject of the present invention is the novel use of the combination of at least one agent for screening out UV radiation chosen from organic and mineral agents and of 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 obtained, for example, 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 the combination of at least one agent for screening out UV radiation chosen from organic and mineral agents and of 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 obtained, for example, in a manner chosen from synthetically, from a plant extract containing it, and from an enriched plant extract containing it.
The compositions 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, which may be at least one of non-covering (that is to say which does not have a tendency to opacify the skin), not removed with at least one of water and solvents, 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.
At least one other characteristic, aspect and advantage of the present invention may become apparent on reading the detailed description which follows.
The compositions in accordance with the present invention can, 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*) colorimetric measuring system by a &Dgr;L* ranging from −0.5 to −20. For example, &Dgr;L* may range from −0.5 to −15.
The compositions in
Candau Didier
Forestier Serge
Dodson Shelly A.
Finnegan Henderson Farabow Garrett & Dunner LLP
L'Oreal (S.A.)
LandOfFree
Compositions comprising at least one UV screening agent and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compositions comprising at least one UV screening agent and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compositions comprising at least one UV screening agent and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2920522