Self tanning compositions containing DHA and propolis extract

Details Self tanning compositions containing DHA and propolis extract Self tanning compositions containing DHA and propolis extract

1999-07-08

2001-01-09

Clardy, S. Mark (Department: 1616)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

C424S059000, C424S195110, C514S532000, C514S675000, C514S844000

Reexamination Certificate

active

06171605

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to self-tanning compositions. More specifically, the invention relates to self-tanning compositions containing a combination of dihydroxyacetone with propolis which produce a more natural tan color when applied to the skin.
BACKGROUND OF THE INVENTION
A tanned complexion is still considered to be an attractive feature. And, a tan is still presently achieved primarily by exposing the skin to ultraviolet (hereinafter referred to as “UV”) radiation. However, the concern about damage to the skin, particularly skin cancer, caused by exposing the skin to UV radiation from the sun or other sources such as, for example, sun lamps, has caused an increased interest in products that can produce a “self-tan” without the use of UV radiation. As a result, compositions useful for inducing a tan without exposure to the sun have been introduced for many years. For example, U.S. Pat. No. 2,949,403 discloses that the compound dihydroxyacetone (hereinafter referred to as “DHA”) can be used for this purpose; since that report, DHA has been widely employed in commercial self-tanning products.
Many variations of the basic DHA formulation have been proposed to overcome or bolster some of the inherent inadequacies experienced when used alone as the active agent in a formulation. One of the most frequent problems encountered with DHA is the tendency to impart an orange cast to the skin of some users; this is caused by a preponderance of yellow color development relative to red color development. In an attempt to compensate for this undesirable result, various dyes have been incorporated with DHA (U.S. Pat. No. 4,708,865). However, the use of dyes in combination with DHA causes the color of the tan to look unnatural, and therefore remains unsatisfactory to the consumer as a self-tanning product.
As awareness regarding the damaging effects of prolonged exposure to the sun and UV radiation increases, the importance of self-tanning products grows commensurately. An important feature of a self-tanner is its ability to produce a very natural looking tan on the skin. A tan produced naturally by exposing the skin to the sun is a deep dark tan with a somewhat bronze coloration. Accordingly, a sunless self-tanning product is desired that can produce a tan comparable to the natural tan achieved by exposing the skin to the sun. Therefore, there remains a need for self-tanning compositions which meet these criteria. The present invention now satisfies these consumer needs.
SUMMARY OF THE INVENTION
The present invention relates to self-tanning compositions which comprise an effective amount of dihydroxyacetone (hereinafter referred to as “DHA”) and an effective amount of propolis extract, or an active component thereof. The combination of DHA and propolis extract produces a self-tan that is darker and more natural looking than that produced by DHA alone. The coloration of the tan does not have the orange cast that a self-tan produced using DHA alone has. There is a shift to a greater content of red in the self tan which makes the self tan look more natural looking. In addition to the shift towards red, there is a lower content of yellow in the self tan. The self-tanning compositions of the present invention enhance the coloration of the self-tan because it has a natural look, similar to the natural tan produced by exposing the skin to the sun. Further, the present invention includes the combination of DHA with an effective amount of substantially pure caffeic acid phenethyl ester (hereinafter referred to as “CAPE”), one active component of propolis extract.
The invention also relates to a method of enhancing the self-tanning effect of DHA-containing compositions in which an effective amount of propolis extract, or active components thereof, is added to DHA-containing compositions. The present invention further includes the method of increasing the red content and lowering the yellow content of the self-tan by adding propolis extract, or active components thereof, such as CAPE, to DHA-containing compositions. Finally, the invention relates to a method for tanning the skin in the absence of the sun and comprises applying to the skin an effective amount of DHA and an effective amount of propolis extract.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
illustrates the effect of 5% DHA compared with a combination of 5% DHA and 0.5% propolis extract as self-tanning agents.
FIG. 2
illustrates the effect on tonality, in terms of reflectance, of a self-tan produced by 5% DHA compared with that of a combination of 5% DHA and 0.5% propolis extract within a natural universe of tan.
FIG. 3
illustrates the effect on tonality, in terms of change in red and yellow color, of a self-tan produced by 5% DHA compared with that of a combination of 5% DHA and 0.5% propolis extract.
FIG. 4
compares the self-tanning action of 5% DHA alone with a combination of 5% DHA and 0.1% CAPE.
FIG. 5
compares the tonality, in terms of reflectance, of a self-tan produced by 5% DHA alone with a self-tan produced with a combination of 5 % DHA and 0.1 % CAPE.
FIG. 6
compares the tonality, in terms of change in red and yellow color, of a self-tan produced by 5% DHA alone with a self-tan produced with a combination of 5% DHA and 0.1% CAPE.


REFERENCES:
patent: 2949403 (1960-08-01), Andreadis et al.
patent: 4708865 (1987-11-01), Turner
patent: 5008441 (1991-04-01), Nakanishi et al.

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