Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
1999-06-15
2001-04-10
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
06214322
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a self-tanning composition containing colorant materials.
BACKGROUND OF THE INVENTION
Because of the risks associated with sun tanning such as sunburn, many people use self-tanning compositions as a means to either achieve a tan without exposure to the sun, obtain a deeper tan with less exposure to the sun, or to extend the natural life of their suntan. The major consumer dissatisfaction relating to self-tanning compositions relates to the unevenness of skin coloration, an effect not often seen until hours after application of the composition. This result stems from the inability to apply even amounts of the sunless tanning composition over large areas of skin.
Companies have recently added color to the finished self-tanning compositions to provide a visual aid to the user, thereby, helping to prevent uneven administration on the skin surface. These colors also provide an immediate darkening effect on the skin. Most of these colorants, however, are nitrogen-based compounds and/or contain metal oxides, e.g., Estee Lauder's Self-action Go Bronze Tinted Self-Tanner for Face. Dihydroxyacetone, the active ingredient in most self-tanning compositions, however, is highly reactive with metal oxides and many chemical compounds containing nitrogen. The present invention relates to the use of colorants in a self-tanning formulation that are not reactive with the active self-tanning agent.
SUMMARY OF THE INVENTION
In one aspect, the invention features a composition comprising carmine and a self-tanning agent. In one embodiment, the composition further comprises caramel. In one embodiment, the ratio between carmine and caramel is between about 1:1 to about 1:100 (e.g., between about 1:5 to 1:50 or between about 1:5 to about 1:30). In one embodiment, the composition comprises between about 0.001% and about 1% (e.g., between about 0.01% to about 0.2%) of carmine. In one embodiment, the composition comprises between about 0.001% and about 5% (e.g., between about 0.1% to about 2%) of caramel. In another embodiment, the self-tanning agent is selected from the group consisting of 1,3-dihydroxyacetone and 1,3,4-trihydroxy-2-butanone. In another embodiment, the composition further comprises the colorant beta-carotene. In one embodiment, the ratio between carmine and beta-carotene is between about 10:1 to about 1:10 (e.g., between about 5:1 to 1:5 or between about 2:1 to about 1:2). In one embodiment, the composition comprises between about 0.001% and about 1% (e.g., between about 0.01% to about 0.2%) of beta-carotene.
In another aspect, the invention features a cosmetic product for application to the hair, skin, or nails of a subject for the purpose of tanning, coloring, and/or darkening the same comprising: (a) the above-mentioned composition; and (b) a cosmetically acceptable carrier.
In one embodiment, the cosmetically acceptable carrier comprises one or more of the members selected from the group consisting of acidifying agents, alkalizing agents, aerosol propellants, antimicrobial agents, antioxidants, buffering agents, chelating agents, coloring additives, dermotologicaly active agents, dispersing agents, emollients, emulsifying agents, humectants, fragrances, preservatives, sugars, sunscreen agents, surfactants, suspending agents, thickening agents, and vehicles.
In another aspect, the invention features a method of tanning, coloring, and/or darkening the hair, skin, or nails of a subject (e.g., a human), the method comprising applying to the same an effective amount of the above-mentioned composition or product.
Other features and advantages of the present invention will be apparent from the detailed description of the invention and from the claims
DETAILED DESCRIPTION OF THE INVENTION
It is believed that one skilled in the art can, based upon the description herein, utilize the present invention to its fullest extent. The following specific embodiments are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. Also, all publications, patent applications, patents, and other references mentioned herein are incorporated by reference.
The present invention relates to the use of natural colorant materials to provide an immediate coloration effect to the skin. The invention relates to the use of carmine, or a blend of carmine with other natural colorants, such as caramel and beta-carotene, where the chemical structure of the other natural colorant does not contain nitrogen. The colorants, thus, do not react with the active self-tanning agent (e.g., 1,3-dihydroxyacetone) and provide the manufacturer the ability to customize the color of the composition to match various skin tones. The caramel provides a brown tone the carmine provides a red tone, and the beta-carotene provides a yellow tone.
What is meant by self-tanning agent is a chemical agent capable of producing or inducing the artificial tanning process of the skin by forming brown pigments in the skin, e.g., through the Maillard reaction reported in Bobin, et al., J. Soc. Cosmet. Chem., 35:265-72 (1984). Examples of self-tanning agents include alloxan, methyl glyoxal, ethoxydiglycol, glyceraldehyde, various indoles and imidazoles and their derivatives, pigmentation agents such as methoxselen and trioxselan, and &agr;-hydroxy ketones and aldehydes such as , e.g., of the formula:
wherein R
1
is H, CH
2
OH, CHOHCH
2
OH, CH(OH)CH(═O), CH(NH
2
)CH(═O), CH(OCH
3
)CH(═O), or CH(NH-Phenyl)CH(═O); and R
2
is H or CH
2
OH. An example of a compound of such formula is 1,3-dihydroxyacetone (i.e., dihydroxyacetone) and 1,3,4-trihydroxy-2-butanone (i.e., erythrulose).
In one aspect, the invention features a cosmetic product for application to hair, skin, and nails of a subject comprising a cosmetically acceptable carrier. The individual components of the carrier are numerous and varied, but are also well known to one skilled in the art. In one aspect, the carrier comprises one or more of the members selected from the group consisting of acidifying agents, alkalizing agents, aerosol propellants, antimicrobial agents, antioxidants, buffering agents, chelating agents, coloring additives, dermotologicaly active agents, dispersing agents, emollients, emulsifying agents, humectants, fragrances, preservatives, sugars, sunscreen agents, surfactants, suspending agents, thickening agents, an vehicles. These ingredients are discussed below. Examples of these agents are listed below as well as in the International Cosmetic Ingredient Dictionary and Handbook, eds. Wenninger and McEwen (The Cosmetic, Toiletry, and Fragrance Assoc., Washington, D.C., 7
th
Edition, 1997) (hereinafter “ICT Handbook”).
When formulating the composition with these ingredients, ones containing metal oxides and active nitrogen groups, e.g., active amine groups, should be avoided when using reactive self-tanning agents (e.g., dihydroxyacetone). Furthermore, agents that interfere with the Maillard reaction should also not be used.
Acidifying and alkalizing agents are added to obtain the desired pH of the composition. Examples of is acidifying agents included citric acid, lactic acid, glycolic acid, acetic acid, glacial acetic acid, malic acid, and proprionic acid. Examples of alkalizing agent include edetol, potassium carbonate, potassium hydroxide, sodium borate, sodium carbonate, sodium citrate, sodium lactate, sodium glycolate, and sodium hydroxide. Other acidifying and alkalizing agents are listed on page 1653 of the ICT handbook.
Aerosol propellants are used when the composition is to be administered as an aerosol under pressure. Examples of aerosol propellants include halogenated hydrocarbons such as dichlorodifluoromethane, dichlorotetrafluoroethane, and trichloromonfluoromethane, nitrogen, and volatile hydrocarbons such as butane, propane, isobutane, or mixt
Castro Mauricio
Woodin, Jr. Frederick W.
Dodson Shelley A.
McGowan William E.
Neutrogena Corporation
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