Sunless tanning emulsions with disappearing color indicator

Details Sunless tanning emulsions with disappearing color indicator Sunless tanning emulsions with disappearing color indicator

1997-11-24

2001-07-17

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

06261541

ABSTRACT:

BACKGROUND
Sunless tanners are products applied to the skin to provide a tan appearance, without exposure to the sun or other radiant energy sources, e.g. tanning beds and ulta-violet lamps. For optimum performance, sunless tanners should be applied evenly to provide a smooth, uniform tan over the skin surface. Unfortunately, a sunless tanner may be applied unevenly because it is difficult to see or visualize after being applied to the skin. Uneven applications may result in a cosmetically unattractive tan having streaks and/or spots. Further, once the sunless tanner is applied to the skin, the tan produced cannot be washed off since the tan is bound to the skin, and the user may need to wait one to two weeks for the uneven tan to wear off. Accordingly, an approach was sought to provide a sunless tanning emulsion which could be readily visualized and thus applied more evenly to the skin, yet would substantially disappear when dried and/or rubbed out on the skin.
SUMMARY OF INVENTION
It has been surprisingly and unexpectedly found that although the inclusion of a water-soluble dye to a sunless tanning emulsion can render the emulsion visually colored, that such coloration would substantially disappear when the colored emulsion dries after it is spread on the skin and/or is rubbed out.
Thus, in one embodiment, the present invention is directed towards a colored, sunless tanning emulsion comprising:
a) at least one water-soluble dye that imparts a color other than white to the colored emulsion, such that when the colored emulsion dries after it is spread on the skin and/or is rubbed out, the color substantially disappears;
b) at least one sunless tanner;
c) at least one emulsfier; and
d) sufficient water to form the colored emulsion.
Preferably, the water-soluble dye is an External DC color or blend thereof, more preferably a blend or mixture of Ext DC violet #2, Ext DC red#33 and FDC Yellow #6, to give a brown color. Also preferred is that the sunless tanner is dihydroxyacetone (DHA). The amount of the water-soluble dye in the colored emulsion can range from about 0.00001 to about 0.5% by weight of the colored, emulsion or composition, preferably from about 0.0001 to about 0.2%, more preferably from about 0.001 to about 0.1%, most preferably from about 0.01 to about 0.05%. Also preferred is that the colored emulsion is an oil-in-water emulsion.
Optionally, the colored, sunless tanning emulsion can contain one or more emollients, humectants, dry-feel modifiers, preservatives, thickening agents, antifoaming agents, antioxidants, chelating agents, sunscreen actives, and fragrances as well as any other class of materials whose presence may be cosmetically, efficaciously or otherwise desirable.
In another embodiment, the present invention is directed towards a method for more uniformly tanning the skin comprising topically applying to the skin the colored, sunless tanning emulsion described above.
The present invention advantageously provides a colored, sunless tanning emulsion that enables the user to apply the emulsion more evenly to the skin, thus providing a more uniform and cosmetically acceptable tan.
Another advantage of the present invention is that it provides a method for more uniformly tanning the skin by topically applying to the skin a colored, sunless tanning emulsion which can be readily visualized as it is being applied to the skin and which substantially disappears when dried on the skin and/or rubbed out on the skin.


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