Bleaching composition

Drug – bio-affecting and body treating compositions – Bleach for live hair or skin

Reexamination Certificate

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C424S070100, C424S070190, C424S070220, C424S070310

Reexamination Certificate

active

06620408

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a preparation in the form of a powder or paste for blonding human hair.
Changing the shape and color of the hair is an important area of modern cosmetics. In this way, the appearance of the hair can be adapted both to the latest fashion trends and to the individual requirements of the consumer. Permanent wave processes and other processes which change the shape of hair may be used virtually irrespective of the hair to be treated. By contrast, coloring processes and particularly blonding processes are limited to certain starting hair colors. Thus, only light brown to medium-brown hair is suitable for lightening processes, so-called blonding processes. The basic principles of blonding processes are known to the expert and are comprehensively described in relevant monographs, for example by K. Schrader in “Grundlagen und Rezepturen der Kosmetika”, 2nd Edition, 1989, Dr. Alfred Hüthig Verlag, Heidelberg, and by W. Umbach (Ed.) in “Kosmetik”, 2nd Edition, 1995, Georg Thieme Verlag, Stuttgart/New York.
For blonding human hair, particularly for so-called tress application, solid or paste-form preparations are normally mixed with a dilute hydrogen peroxide solution immediately before use. The resulting mixture is applied to the hair and then rinsed out after a certain contact time.
The preparations mentioned, which are normally mixed with a hydrogen peroxide solution before use, are referred to hereinafter as “blonding preparations”. All quantities mentioned relate exclusively to these preparations, unless otherwise stated.
Neither the paste-form nor the powder-form blonding preparations presently available on the market can be regarded as optimal. Although their blonding effect on the hair is satisfactory, they are still attended by various disadvantages and problems both at the production level and from the handling perspective. In the case of paste-form preparations which are made highly viscous on stability grounds, dosing and mixing behavior in the hydrogen peroxide solution are still unsatisfactory. Dust behavior is another problem in the production of pastes. In the case of powder-form products, dust behavior both during production and in use and mixing behavior in use are the focus of efforts at improvement.
It is proposed in EP-B1-0 560 088, for example, to improve the dust behavior of blonding powders by addition of oils or liquid waxes. In addition, it is proposed in German patent application DE-A1-196 00 216 to use special ethers in quantities of 4 to 20% by weight, based on the blonding powder as a whole, for de-dusting. Blonding pastes are described in DE-A1-38 14 356 for avoiding dust emission during processing.
It has now surprisingly been found that blonding preparations with excellent dust behavior and other advantageous properties can be obtained providing they contain certain dicarboxylic acids.
SUMMARY OF THE INVENTION
Accordingly, the present invention relates to powder-form or paste-form preparations for blonding human hair based on at least one solid peroxo compound and at least one solid alkalizing agent, characterized in that they contain a dicarboxylic acid corresponding to formula (I):
where m and n independently of one another stand for 0, 1 or 2, or esters thereof.
DETAILED DESCRIPTION OF THE INVENTION
The blonding preparations according to the invention contain a solid peroxo compound as a first compulsory component. Basically, the choice of this peroxo compound is not subject to any restrictions. Standard peroxo compounds known to the expert are, for example, ammonium peroxydisulfate, potassium peroxydisulfate, sodium peroxydisulfate, ammonium persulfate, potassium persulfate, sodium persulfate, potassium peroxydiphosphate, percarbonates, such as magnesium percarbonate, peroxides, such as barium peroxide, and perborates, urea peroxide and melamine peroxide. Of these peroxo compounds, which may also be used in combination, the inorganic compounds are preferred for the purposes of the invention. The peroxydisulfates, especially combinations of at least two peroxydisulfates, are particularly preferred.
The peroxo compounds are present in the blonding preparations according to the invention in quantities of preferably 20 to 80% by weight and more preferably 40 to 70% by weight.
The blonding preparations according to the invention contain an alkalizing agent to establish the alkaline pH of the mixture applied as a second compulsory component. According to the invention, the usual alkalizing agents known to the expert for blonding preparations, such as ammonium, alkali metal and alkaline earth metal hydroxides, carbonates, hydrogen carbonates, hydroxycarbonates, silicates, more particularly metasilicates, and alkali metal phosphates, may be used. In one preferred embodiment, the blonding preparations according to the invention contain at least two different alkalizing agents. Mixtures of, for example, a metasilicate and a hydroxycarbonate can be preferred.
The blonding preparations according to the invention contain alkalizing agents in quantities of preferably 10 to 30% by weight and more preferably 15 to 25% by weight.
According to the invention, the third compulsory component of the blonding preparations is a dicarboxylic acid corresponding to formula (I) or an ester thereof, a compound of formula (I) where m=2 and n=0, 3,6,9-trioxaundecanedioic acid, being particularly preferred. Mixtures of several dicarboxylic acids may also be used.
The blonding preparations according to the invention contain the dicarboxylic acid corresponding to formula (I) in a quantity of preferably 1 to 10% by weight.
In addition, it has been found to be of advantage for the powder-form preparations according to the invention to contain nonionic surfactants. Surfactants with an HLB value of 5.0 or higher are preferred. A definition of the HLB value can be found in Hugo Janistyn, “Handbuch der Kosmetika und Riechstoffe”, Vol. III: Die Körperpflegemittel, 2nd Edition, Dr. Alfred Hüthig Verlag Heidelberg, 1973, pages 68-78 and Hugo Janistyn, “Taschenbuch der modernen Parfümerie und Kosmetik”, 4th Edition, Wissenschaftliche Verlagsgesellschaft m.b.H. Stuttgart, 1974, pages 466-474 and the original works cited therein.
Substances which are commercially available in pure form as solids or liquids are particularly preferred nonionic surfactants because they are easy to process. The definition of purity in this connection does not relate to chemically pure compounds. Instead, mixtures of various homologs, for example with different alkyl chain lengths as are obtained in products based on natural fats and oils, may be used, particularly in the case of products on a natural basis. Even with alkoxylated products, mixtures with different degrees of alkoxylation are normally present. “Purity” in this connection rather relates to the fact that the substances selected should preferably be free from solvents, antiflow additives and other impurities.
Preferred nonionic surfactants are:
alkoxylated fatty alcohols containing 8 to 22 and more particularly 10 to 16 carbon atoms in the fatty alkyl group and 1 to 30 and preferably 1 to 15 ethylene oxide and/or propylene oxide units. Preferred fatty alkyl groups are, for example, lauryl, myristyl, cetyl and stearyl, isostearyl and oleyl groups. Particularly preferred compounds of this class are, for example, lauryl alcohol containing 2 to 4 ethylene oxide units, oleyl and cetyl alcohol containing 5 to 10 ethylene oxide units, cetyl and stearyl alcohol containing 10 to 30 ethylene oxide units and mixtures thereof and the commercial product Aethoxal® B (Henkel), a lauryl alcohol containing 5 ethylene oxide and 5 propylene oxide units. Besides the usual alkoxylated fatty alcohols, so-called “end-capped” compounds may also be used in accordance with the invention. In these compounds, the alkoxy group does not terminate in an OH group, but is “end-capped” in the form of an ether, more particularly a C
1-4
alkyl ether. One example of such a compound is the commercial product Dehypon® LT 054

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