Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Patent
1995-05-26
1997-04-15
Dodson, Shelly A.
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
424 60, 424 7808, A61K 742, A61K 3174
Patent
active
056206810
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a self-tanning cosmetic composition and, more particularly, to an improvement of a self-tanning cosmetic composition containing dihydroxy acetone.
BACKGROUND ART
A self-tanning cosmetic composition containing dihydroxy acetone (hereinunder referred to as "DHA" is intended to color the skin as if it were tanned without being exposed to the sun (ultraviolet), and various products are commercially available.
Those products are required to be uniformly applied to the skin in order to prevent uneven coloring. They are generally produced in the form of an emulsified product such as cream with the stability of the product containing DHA taken into consideration.
On the other hand, since a self-tanning cosmetic composition which does not contain oil can color the skin in a shorter time, a prescription of a lotion which does not contain oil and is mixed with DHA is proposed with importance set on a coloring ability to the skin.
However, since such a lotion does not spread well on the skin, uniform application is difficult, which results in uneven coloring of the skin. In other words, the finish in self-tanning is apt to be greatly damaged.
In addition, an aqueous self-tanning lotion has such a low viscosity that it often drips and causes unevenness in the color when it is applied to the skin. That is, since there is a great problem in the finish in self-tanning, the commercialization of the aqueous lotion is difficult.
In order to eliminate the problem in a self-tanning lotion such as dripping and uneven coloration, attempts have long been made to add a thickening agent to a self-tanning lotion so as to increase the viscosity.
For example, a method of adding a thickening agent which is represented by sodium polyacrylate (Carbopole 940, Carbopole 941, etc. produced by B.F.GOODRICH) to a prescription containing DHA has been investigated. However, this produces a great problem in the guarantee of the quality, because, for example, the stability of the viscosity with time is greatly lowered due to the decrease in the pH caused by the addition of DHA, and the external color of the product changes to brown with time.
In contrast, it is possible to prevent the color of a self-tanning lotion from changing to brown by using a nonionic thickening agent. In this case, however, it is also impossible to suppress the lowering of the viscosity with time. In addition, since the thickening effect of a nonionic thickening agent is much lower than that of a polyacrylate thickening agent, it is necessary to add a large amount of nonionic thickening agent to obtain the same viscosity. In this case, the product becomes tacky, which is peculiar to a polymer and produces an unpleasant feeling when applied to the skin.
DISCLOSURE OF INVENTION
Accordingly, it is a first object of the present invention to eliminate the above-described problems in the related art and to provide a self-tanning cosmetic which spreads well on the skin.
It is a second object of the present invention to provide a self-tanning cosmetic which can prevent dripping and uneven coloration, which produces a satisfactory feeling when applied to the skin, and which has an excellent quality stability with time.
As a result of studies undertaken by the present inventors so as to achieve the first object, it has been found that a self-tanning cosmetic composition produced by adding DHA and a specific surfactant to a base having a low oil content can color the skin beautifully without a fear of uneven coloring. On the basis of this finding, the present invention has been completed.
A self-tanning cosmetic composition provided in a first aspect of the present invention is characterized in that the oil content is less than 10%, and in that it contains DHA and a polyoxyethylene-polyoxypropylene block copolymer type surfactant.
To achieve the second object, it is necessary to add alcohol and a chelate as well as a specific water-soluble thickening agent.
A self-tanning cosmetic gel provided in a second aspect of the present i
REFERENCES:
patent: 5232688 (1993-08-01), Ziegler et al.
patent: 5271930 (1993-12-01), Walele et al.
patent: 5302378 (1994-04-01), Crotty et al.
Manufacturing Chemist & Aerosol News, Aug. 1976, p. 41, `artificial suntan preparations`; p. 41, right column.
Ito Kenzo
Takata Sadaki
Dodson Shelly A.
Shiseido Co. Ltd.
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