Cosmetic compositions with a content of hydrogenperoxide and alp

Details Cosmetic compositions with a content of hydrogenperoxide and alp Cosmetic compositions with a content of hydrogenperoxide and alp

1988-03-02

1989-07-04

Schofer, Joseph L.

Drug, bio-affecting and body treating compositions

Bleach for live hair or skin

424 70, A61K 7135

Patent

active

048448869

DESCRIPTION:

BRIEF SUMMARY
The subject of the invention is cosmetic compositions having a content of hydrogen peroxide and alpha-bisabolol having the following formula (I): ##STR2## as well as the use of alpha-bisabolol for the stabilization of hydrogen peroxide.
In cosmetic compositions, hydrogen peroxide is for example used for disinfecting the skin, for oxidative hair dyeing and bleaching, and for oxidative treatment following a reductive deformation of the hair.
Hydrogen peroxide is a metastable compound and gives off oxygen when it decomposes. Oxygen has a very low solubility in water (Bunsen adsorption coefficient at 20.degree. C.: 0.03). In closed containers, and especially over a long storage period, an overpressure can accordingly arise. This can cause part of the composition in the container to spill over in the form of foam or spray. The overpressure can also cause the container to break, and if plastic containers are used it can cause deformation or even explosions.
In cosmetic compositions containing hydrogen peroxide, it is therefore necessary to stabilize the hydrogen peroxide.
In the literature by W. Machu, "Das Wasserstoffperoxid" [Hydrogen Peroxide], Springer-Verlag (1951), pp. 197-208, a great number of stabilizers for hydrogen peroxide are described, including, among others, certain organic compounds. These compounds are found not to be completely satisfactory, however, in terms of their stabilization capability over a relatively long period of time.
From German Reich Patent No. 91 285 (to C. Raspe), it is known that among others, the terpenes thymol, menthol and camphor are capable of stabilizing solutions containing hydrogen peroxide. These compounds, however, have an unpleasant sharp odor, and in cosmetic compositions they are usable to only a very limited extent.
It is therefore the object of the invention to provide a cosmetic composition having a hydrogen peroxide content, in which the hydrogen peroxide is better stabilized than when comparable known stabilizers are used, and which does not have an unpleasant odor.
To this end it has now been found that by the use of alpha-bisabolol having the formula (I) ##STR3## as a stabilizer of hydrogen peroxide, this object is attained in a superior manner.
Although the alpha-bisabolol is also a terpene, its capacity for stabilizing hydrogen peroxide is unexpectedly from 15 to 10 times greater than that of thymol, menthol or camphor. This property, which was unforeseeable, is documented by the comparison test in Example 1.
The alpha-bisabolol furthermore has a slightly sweet, flowery odor, so that it does not add any unpleasant odor to the cosmetic compositions.
It has also been found that the reddening of the skin and burning effects, which can arise when compositions containing hydrogen peroxide are used, is lessened by the alpha-bisabolol.
The subject of the invention is also a cosmetic compositions that contains hydrogen peroxide and alpha-bisabolol having the formula (I).
In the novel cosmetic composition, the hydrogen peroxide should be contained in a quantity of approximately 0.5 to 18% by weight, while the quantity of alpha-bisabolol is approximately 0.01 to 2.5% by weight. range from approximately 1.5 to 3.5.
In the composition according to the invention, the alphabisabolol can be contained as the sole stabilizer, or it can be contained in combination with other already known stabilizers.
Possible known stabilizers are, for example, aromatic sulfonic acids, or acid salts of strong acids, such as alkali hydrogen sulfates, acidic alkali pyrophosphates, sodium metaphosphates and alkali polyphosphates. Ascorbic acid, sulfuric acid, phosphoric acid, pyro- or polyphosphoric acid, hydrochloric acid, oxalic acid, benzoic acid, salicylic acid, malonic acid, citric acid and tannic acid, as well as phenol, thymol, paraformaldehyde, 4-acetamidophenol and phenacetin can also be included.
The novel composition can also contain tensides, on the condition that their hydrophobic components are saturated and are not oxidizable.
Suitable tensides include, above all, the followi

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