AU1382300A - De-dusting powdery agents - Google Patents

Abstract

The invention relates to the use of at least one liquid solvent at 25 DEG C, chosen from the group of hydrocarbons, alcohols, esters and ketones to de-dust bleaching agents and powdery dye mixtures containing the usual cosmetic constituents. The inventive agents are characterized by outstanding dust performance and good storage stability.

Description

WO 00/30596 1 PCT/EP99/08649 De-dusting Powdery Agents This invention relates to the use of certain solvents for de-dusting blonding powders and powder-form dye mixtures and to corresponding blonding and coloring preparations. Changing the shape and color of the hair is an important area of 5 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 10 limited to certain starting hair colors. Thus, only dark blond or relatively light 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, 15 1989, Dr. Alfred HOthig 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 20 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 agents". All quantities mentioned relate exclusively to these preparations, unless otherwise stated. 25 Neither the paste-form nor the powder-form blonding agents presently available on the market can be regarded as optimal. Although their blonding effect on the hair is satisfactory, they are still attended by WO 00/30596 2 PCT/EP99/08649 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 5 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. Another factor which has to be taken into account in the formulation of blonding agents is that they often contain ammonium salts such as, for 10 example, ammonium chloride or ammonium peroxydisulfate. Basic components are capable of reacting with these salts in storage with release of ammonia, resulting in odor emission and a reduction in shelf life. 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. 15 Unfortunately, this also leads to a number of disadvantages. Thus, powder-form products show only limited flowability after the addition of oils and waxes and tend to agglomerate. In addition, the use of oils and waxes complicates removal by rinsing after the treatment because they can accumulate on the hair. The use of fats and waxes is also problematical 20 from the perspective of production of the blonding agents because they have to be melted before spraying. This necessitates greater outlay on equipment such as, for example, heated pipes. 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 25 the blonding powder as a whole, for de-dusting. Unfortunately, these powders are not entirely satisfactory either. Powder-form coloring powder mixtures have played an important role for some time. DE-A1 32 07 037, for example, describes powder-form hair colorants based on dyes and at least one solid diluent. More recent 30 patents, for example DE-C1-197 13 696, also describe the use of powder- WO 00/30596 3 PCT/EP99/08649 form preparations for coloring and tinting human hair. As with the blonding powders, dust behavior both during production and in use and mixing behavior in use are the focus of efforts at improvement. It is proposed in DE-A1-195 00 225 to de-dust powder-form heterogeneous hair coloring 5 powders with oils, liquid waxes or liquid derivatives of these compounds. Nevertheless, there is still a need for agents for de-dusting powder-form preparations. It has now surprisingly been found that certain solvents are eminently suitable for de-dusting powders and that the preparations 10 obtained are distinguished by excellent dust behavior, very good stability in storage and other advantageous properties. In a first embodiment, therefore, the present invention relates to the use of a solvent liquid at 25*C selected from the group of hydrocarbons, alcohols, esters and ketones for de-dusting blonding powders and powder 15 form dye mixtures containing typical cosmetic ingredients. Hydrocarbons in the context of the present invention are understood to be saturated, mono- or polyunsaturated, branched or unbranched, aliphatic or cycloaliphatic compounds containing 5 to 20 carbon atoms. According to the invention, this definition also encompasses compounds 20 containing fused ring systems, for example tetralin and decalin. According to the invention, compounds containing 6 to 12 carbon atoms are particularly preferred. Alcohols, esters and ketones in the context of the invention are saturated, mono- or polyunsaturated, branched or unbranched, aliphatic or 25 cycloaliphatic compounds containing 2 to 9 carbon atoms which contain at least one functional group defining the particular group of compounds. Examples of solvents according to the invention from the group of alcohols are isopropanol, 2-ethyl hexanol, 3-methoxybutanol, benzyl alcohol, propane-1,2-diol, hexanol, diacetone alcohol and ethyl diglycol. 30 Examples of solvents according to the invention from the group of WO 00/30596 4 PCT/EP99/08649 esters are propylene carbonate, isopropyl acetate, hexyl acetate and ethyl glycol acetate. Examples of solvents according to the invention from the group of ketones are cyclohexanone, methyl isobutyl ketone and methyl heptyl 5 ketone. Particularly preferred solvents for de-dusting are selected from a group consisting of 3-methoxybutanol, benzyl alcohol, propane-1,2-diol, hexanol, cyclohexanone, propylene carbonate and ethyl diglycol. 3 Methoxybutanol, benzyl alcohol and propane-1,2-diol are most particularly 10 preferred. In one preferred embodiment, the solvents used have a solubility in water at 200C of more than 1 g/l. Solvents with a solubility of 5 g/I or more can be particularly preferred. In another preferred embodiment of the present invention, solvents 15 containing polar functional groups are used because they are distinguished by greater hydrophilia. Such solvents are easier to wash out from the hair and do not stress the hair. In a second embodiment, the present invention relates to powder form and paste-form agents for blonding human hair based on at least one 20 solid peroxo compound and at least one solid alkali source which contain at least one solvent liquid at 250C selected from the group of hydrocarbons, alcohols, esters and ketones for de-dusting. The blonding agents according to the invention contain a solid peroxo compound as a first compulsory component. Basically, the choice 25 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, 30 peroxides, such as barium peroxide, and perborates, urea peroxide and WO 00/30596 5 PCT/EP99/08649 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. 5 The peroxo compounds are present in the blonding agents according to the invention in quantities of preferably 20 to 80% by weight and more preferably 40 to 70% by weight. The blonding agents according to the invention contain an alkalizing agent to establish the alkaline pH of the mixture applied as a second 10 compulsory component. According to the invention, the usual alkalizing agents known to the expert for blonding agents, 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, 15 the blonding agents 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 agents according to the invention contain alkalizing agents in quantities of preferably 10 to 30% by weight and more preferably 15 to 25% by weight. 20 For use on the hair, the blonding agents according to the invention are mixed with a hydrogen peroxide solution immediately before application. The concentration of this hydrogen peroxide solution is determined on the one hand by legal requirements and, on the other hand, by the desired effect. 6% to 12% solutions in water are generally used. 25 The quantity ratios of blonding agent and hydrogen peroxide solution are normally in the range from 1:1 to 1:2, an excess of hydrogen peroxide solution being selected in particular when not too pronounced a blonding effect is required. In a third embodiment, the present invention relates to powder-form 30 preparations for coloring and tinting human hair which contain at least one WO 00/30596 6 PCT/EP99/08649 substantive dye and/or an oxidation dye precursor and, for de-dusting, at least one solvent liquid at 25 0 C selected from the group of hydrocarbons, alcohols, esters and ketones. Hair colorants contain so-called primary and secondary 5 intermediates as oxidation dye precursors. The primary intermediates form the actual dyes with one another or by coupling with one or more secondary intermediates under the influence of oxidizing agents or atmospheric oxygen, optionally with the aid of special enzymes or metal ions as catalyst. 10 According to the invention, preferred primary intermediates are p phenylenediamine, p-toluylenediamine, p-aminophenol, o-aminophenol, 1 (2'-hydroxyethyl)-2,5-diaminobenzene, N,N-bis-(2-hydroxyethyl)-p phenylenediamine, 2-(2,5-diaminophenoxy)-ethanol, 1 -phenyl-3 carboxyamido-4-amino-5-pyrazolone, 4-amino-3-methylphenol, 2,4,5,6 15 tetraaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 4-hydroxy-2,5,6 triaminopyrimidine, 2,4-dihydroxy-5,6-diaminopyrimidine, 2-dimethylamino 4,5,6-triaminopyrimidine, 2-hydroxyethylaminomethyl-4-aminophenol, 4,4' diaminodiphenylamine, 4-amino-3-fluorophenol, 2-aminomethyl-4 aminophenol, 2-hydroxymethyl-4-aminophenol, bis-(2-hydroxy-5 20 aminophenyl)-methane, 1,4-bis-(4-aminophenyl)-diazacycloheptane, 1,3 bis-(N-(2-hydroxyethyl)-N-(4-aminophenylamino))-2-propanol, 4-amino-2 (2-hydroxyethoxy)-phenol and 4,5-diaminopyrazole derivatives according to EP 0 740 741 and WO 94/08970 such as, for example, 4,5-diamino-1-(2' hydroxyethyl)-pyrazole. 25 Most particularly preferred primary intermediates are p phenylenediamine, p-toluylenediamine, p-aminophenol, o-aminophenol, 1 (2'-hydroxyethyl)-2,5-diaminobenzene, 4-amino-3-methylphenol, 2,4,5,6 tetraaminopyrimidine, 2-hydroxy-4,5,6-triamiopyrimidine and 4-hydroxy 2,5,6-triaminopyrimidine.

WO 00/30596 7 PCT/EP99/08649 According to the invention, preferred secondary intermediates are 1 naphthol, pyrogallol, 1,5-, 2,7- and 1,7-dihydroxynaphthalene, o aminophenol, 5-amino-2-methylphenol, m-aminophenol, resorcinol, resorcinol monomethyl ether, m-phenylenediamine, 1-phenyl-3-methyl-5 5 pyrazolone, 2,4-dichloro-3-aminophenol, 1,3-bis-(2,4-diaminophenoxy) propane, 4-chlororesorcinol, 2-chloro-6-methyl-3-aminophenol, 2-methyl resorcinol, 5-methyl resorcinol, 2,5-dimethyl resorcinol, 2,6 dihydroxypyridine, 2,6-diaminopyridine, 2-amino-3-hydroxypyridine, 2,6 dihydroxy-3,4-diaminopyridine, 3-amino-2-methylamino-6-methoxypyridine, 10 4-amino-2-hydroxytoluene, 2,6-bis-(2-hydroxyethylamino)-toluene, 2,4 diaminophenoxyethanol, 1 -methoxy-2-amino-4-(2-hydroxyethylamino) benzene, 2-methyl-4-chloro-5-aminophenol, 6-methyl-1,2,3,4-tetrahydro quinoxaline, 3,4-methylenedioxyphenol, 3,4-methylenedioxyaniline, 2,6 dimethyl-3-aminophenol, 3-amino-6-methoxy-2-methylaminophenol, 2 15 hydroxy-4-aminophenoxyethanol, 2-methyl-5-(2-hydroxyethylamino)-phenol and 2,6-dihydroxy-3,4-dimethyl pyridine. Most particularly preferred secondary intermediates are 1-naphthol, 1,5-, 2,7- and 1,7-dihydroxynaphthalene, 3-aminophenol, 5-amino-2 methylphenol, resorcinol, 4-chlororesorcinol, 2-chloro-6-methyl-3 20 aminophenol, 2-methyl resorcinol, 5-methyl resorcinol, 2,5-dimethyl resorcinol, 2,6-dihydroxy-3,4-diaminopyridine and 6-methyl-1,2,3,4 tetrahydroquinoxaline. The hair colorants according to the invention contain both the primary intermediates and the secondary intermediates in a quantity of 25 preferably 0.005 to 20% by weight, based on the colorant without the oxidizing agent preparation. The primary and secondary intermediates are generally used in substantially equimolar quantities. Although the use of substantially equimolar quantities has proved to be appropriate, there is no disadvantage in using a certain excess of individual oxidation dye WO 00/30596 8 PCT/EP99/08649 precursors, so that primary and secondary intermediates may be present in a molar ratio of 1:0.5 to 1:2. Basically, the color may be oxidatively developed with atmospheric oxygen. However, a chemical oxidizing agent is preferably used, 5 particularly when human hair is to be not only colored, but also lightened. Particularly suitable oxidizing agents are persulfates, chlorites and above all hydrogen peroxide or addition products thereof with urea, melamine or sodium borate. Oxidation may also be carried out with enzymes. In this case, the enzymes may be used both to produce oxidizing per compounds 10 and to enhance the effect of an oxidizing agent present in small quantities. One example of an enzymatic process is the procedure whereby the effect of small quantities (for example I% and less, based on the formulation as a whole) of hydrogen peroxide is enhanced by peroxidases. The substantive dyes used in the agents according to the invention 15 are typically nitrophenylenediamines, nitroaminophenols, azo dyes, anthraquinones or indophenols. Preferred substantive dyes are the compounds known under the International names or commercial names of HC Yellow 2, HC Yellow 4, HC Yellow 5, HC Yellow 6, Basic Yellow 57, Disperse Orange 3, HC Red 3, HC Red BN, Basic Red 76, HC Blue 2, HC 20 Blue 12, Disperse Blue 3, Basic Blue 99, HC Violet 1, Disperse Violet 1, Disperse Violet 4, Disperse Black 9, Basic Brown 16 and Basic Brown 17 and also 4-amino-2-nitrodiphenylamine-2'-carboxylic acid, 6-nitro-1,2,3,4 tetrahydroquinoxaline, hydroxyethyl-2-nitrotoluidine, picramic acid, 2 amino-6-chloro-4-nitrophenol, 4-ethylamino-3-nitrobenzoic acid and 2 25 chloro-6-ethylamino-1-hydroxy-4-nitrobenzene. The agents according to the invention contain the substantive dyes in a quantity of, preferably, 0.01 to 20% by weight, based on the colorant as a whole. In addition, the preparations according to the invention may also contain naturally occurring dyes such as, for example, henna red, henna 30 neutral, henna black, camomile blossom, sandalwood, black tea, black WO 00/30596 9 PCT/EP99/08649 alder bark, sage, logwood, madder root, catechu, sedre and alkanet. Other dye components present in the colorants according to the invention may be indoles and indolines and physiologically compatible salts thereof. Preferred examples are 5,6-dihydroxyindole, N-methyl-5,6-di 5 hydroxyindole, N-ethyl-5,6-dihydroxyindole, N-propyl-5,6-dihydroxyindole, N-butyl-5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid, 6 hydroxyindole, 6-aminoindole and 4-aminoindole. Also preferred are 5,6 dihydroxyindoline, N-methyl-5,6-dihydroxyindoline, N-ethyl-5,6-dihydroxy indoline, N-propyl-5,6-dihydroxyindoline, N-butyl-5,6-dihydroxyindoline, 5,6 10 dihydroxyindoline-2-carboxylic acid, 6-hydroxyindoline, 6-aminoindoline and 4-aminoindoline. The agents according to the invention normally contain the de dusting solvents in quantities of 0.5 to 30% by weight. Depending on the solvent, it can be of advantage to use between 10 and 30% by weight of 15 the solvent. In one particularly preferred embodiment of the invention, 5 to 20% by weight of solvent is used for de-dusting. The percentages by weight mentioned apply to the entire powder-form agent to be de-dusted. In addition, it has been found to be of advantage for the powder form agents according to the invention to contain nonionic surfactants. 20 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 K6rperpflegemittel, 2nd Edition, Dr. Alfred Huthig Verlag Heidelberg, 1973, pages 68-78 and Hugo Janistyn, "Taschenbuch der modernen Parfumerie und Kosmetik", 4th Edition, 25 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 30 to chemically pure compounds. Instead, mixtures of various homologs, for WO 00/30596 10 PCT/EP99/08649 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 5 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 10 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 15 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 20 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 C1.4 alkyl ether. One example of such a compound is the commercial product Dehypon@ LT 054, a C 12 -1 8 fatty alcohol + 4.5 ethylene oxide butyl ether. 25 - alkoxylated fatty acids containing 8 to 22 and more particularly 10 to 16 carbon atoms in the fatty acid group and 1 to 30 and more particularly 1 to 15 ethylene oxide and/or propylene oxide units. Preferred fatty acids are, for example, lauric, myristic, palmitic, stearic, isostearic and oleic acid. 30 - alkoxylated, preferably propoxylated and more preferably ethoxylated WO 00/30596 11 PCT/EP99/08649 mono-, di- and triglycerides. Examples of preferred compounds are glycerol monolaurate + 20 ethylene oxide and glycerol monostearate + 20 ethylene oxide. - polyglycerol esters and alkoxylated polyglycerol esters. Preferred 5 compounds of this class are, for example, poly(3)glycerol diisostearate (commercial product: Lameform@ TGI (Henkel)) and poly(2)glycerol polyhydroxy stearate (commercial product: Dehymuls@ PGPH (Henkel)). - sorbitan fatty acid esters and alkoxylated sorbitan fatty acid esters 10 such as, for example, sorbitan monolaurate and sorbitan monolaurate + 20 ethylene oxide (EO). - alkyl phenols and alky phenol ethoxylates containing 6 to 21 and more particularly 6 to 15 carbon atoms in the alkyl chain and 0 to 30 ethylene oxide and/or propylene oxide units. Preferred 15 representatives of this class are, for example, nonylphenol + 4 EO, nonylphenol + 9 EO, octyl phenol + 3 EO and octyl phenol + 8 EO. Particularly preferred classes of nonionic surfactants are the alkoxylated fatty alcohols, the alkoxylated fatty acids and the alkyl phenols 20 and alkyl phenol ethoxylates. Agents according to the invention containing nonionic surfactants in quantities of 0.5 to 10% by weight have been found to be particularly advantageous. In addition, the agents according to the invention may contain any of 25 the active principles, additives and auxiliaries typically present in such preparations. In many cases, the agents contain at least one surfactant. In principle, both anionic and zwitterionic, ampholytic and cationic surfactants are suitable. In many cases, however, it has proved to be of advantage to select the surfactants from anionic, cationic or nonionic surfactants. 30 Anionic surfactants can be particularly advantageous.

WO 00/30596 12 PCT/EP99/08649 Preferred anionic surfactants are alkyl sulfates, ether carboxylic acid salts containing 10 to 18 carbon atoms in the alkyl group and up to 12 glycol ether groups in the molecule, such as C1 2

H

25

-(C

2

H

4 0) 6

-CH

2 -COONa and, more particularly, salts of saturated and especially unsaturated Ca- 2 2 5 carboxylic acids, such as oleic acid, stearic acid, isostearic acid and palmitic acid. These anionic surfactants should preferably be present in solid form, more particularly powder form. Soaps solid at 25 0 C, more particularly sodium stearate, are most particularly preferred. These soaps are present 10 in quantities of preferably 5 to 20% by weight and more preferably 10 to 15% by weight. Suitable nonionic surfactants are, in particular, C 8

-

2 2 alkyl mono- and oligoglycosides and ethoxylated analogs thereof. The nonethoxylated compounds in particular, which are also commercially available in powder 15 form, have proved to be especially suitable. Examples of the cationic surfactants suitable for use in the hair treatment preparations according to the invention are, in particular, quaternary ammonium compounds. Preferred quaternary ammonium compounds are ammonium halides, such as alkyl trimethyl ammonium 20 chlorides, dialkyl dimethyl ammonium chlorides and trialkyl methyl ammonium chlorides, for example cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, distearyl dimethyl ammonium chloride, lauryl dimethyl ammonium chloride, lauryl dimethyl benzyl ammonium chloride and tricetyl methyl ammonium chloride. Other cationic 25 surfactants suitable for use in accordance with the invention are the quaternized protein hydrolyzates. Alkyl amidoamines, particularly fatty acid amidoamines, such as the stearyl amidopropyl dimethyl amine obtainable as Tego Amid@ S 18, are distinguished not only by their favorable conditioning effect, but also by 30 their ready biodegradability. Quaternary ester compounds, so-called WO 00/30596 13 PCT/EP99/08649 "esterquats", such as the distearoyl ethyl hydroxyethyl ammonium methosulfate marketed under the name of Dehyquart@ F 75 in admixture with cetearyl alcohol, are also readily biodegradable. The compounds containing alkyl groups used as surfactants may be 5 single compounds. In general, however, these compounds are produced from native vegetable or animal raw materials so that mixtures with different alkyl chain lengths dependent upon the particular raw material are obtained. Other active substances, auxiliaries and additives are, for example, 10 - nonionic polymers such as, for example, vinyl pyrrolidone/vinyl acrylate copolymers, polyvinyl pyrrolidone and vinyl pyrrolidone/vinyl acetate copolymers and polysiloxanes, - cationic polymers, such as quaternized cellulose ethers and other compounds stable and commercially obtainable as solids, 15 - zwitterionic and amphoteric polymers stable and preferably commercially obtainable as solids, - anionic polymers such as, for example, polyacrylic acids, crosslinked polyacrylic acids and vinyl acetate/crotonic acid copolymers providing they are stable and preferably commercially obtainable as solids, 20 - thickeners, such as agar agar, guar gum, alginates, xanthan gum, gum arabic, karaya gum, locust bean gum, linseed gums, dextrans, cellulose derivatives, for example methyl cellulose, hydroxyalkyl cellulose and carboxymethyl cellulose, starch fractions and derivatives, such as amylose, amylopectin and dextrins, clays such as, for example, 25 bentonite or fully synthetic hydrocolloids such as, for example, polyvinyl alcohol, - structurants, such as glucose, maleic acid and lactic acid, - hair-conditioning compounds, such as phospholipids, for example soybean lecithin, egg lecithin and kephalins, and also silicone oils, 30 - protein hydrolyzates, more particularly elastin, collagen, keratin, milk WO 00/30596 14 PCT/EP99/08649 protein, soybean protein and wheat protein hydrolyzates, condensation products thereof with fatty acids and quaternized protein hydrolyzates, - perfume oils, dimethyl isosorbide and cyclodextrins, - dyes for coloring the preparations, 5 - active principles, such as panthenol, pantothenic acid, allantoin, pyrrolidone carboxylic acids and salts thereof, - cholesterol, - fats and waxes, such as spermaceti, beeswax, montan wax, paraffins, - fatty alcohols and fatty acid esters, 10 - fatty acid alkanolamides, - complexing agents, such as EDTA, NTA and phosphonic acids, - swelling and penetration agents, such as carbonates, hydrogen carbonates, guanidines, ureas and primary, secondary and tertiary phosphates. 15 The expert will choose these other substances according to the desired properties of the agents. In one preferred embodiment - particularly if the hair is not to be excessively weighted - the agents according to the invention are free from 20 oils and liquid waxes. It is important to make clear in this regard that oils in this context are the known fatty and synthetic oils, but not perfume oils which may of course be used in small quantities as fragrances. The powder-form agents according to the invention may be produced by the standard methods known to the expert. In one preferred 25 method, the inorganic components present as a solids are introduced first after mixing, for example in a Drais mixer, and optionally sprayed with the solvent. This is preferably done at room temperature, i.e. at temperatures below about 300C. Another method of producing the agents according to the invention is to grind all the components in a ball mill, for example in a 30 centrifugal ball mill, a ring-roll mill or, more particularly, a spindle mill.

WO 00/30596 15 PCT/EP99/08649 Finally, the powder-form agents can be produced by mixing all the components and then treating the resulting mixture in a fluidized bed, preferably at elevated temperature depending on the solvent used. The following Examples are intended to illustrate the invention. Examples 1. Blonding powder The follow base for blonding powders was prepared: Pyrogenic highly disperse silica (type N 20 P) 2.0% by weight Sodium silicate, water-free 8.0% by weight Potassium persulfate 35.0% by weight Carboxymethyl cellulose, sodium salt 3.0% by weight Disodium ETA 2.0% by weight Ammonium persulfate 12.0% by weight Ariabel Blue' 0.4% by weight Magnesium carbonate, heavy to 88.0% by weight Polysulfide Sodium Silicoaluminate (INCI name: C.I. 77007) (Goldman) The blonding agent base was then de-dusted with quantities of 12.0% by weight of the following solvents: Formulation 1 3-Methoxybutanol Formulation 2 Benzyl alcohol Formulation 3 Propane-1,3-diol Formulation 4 Hexanol Formulation 5 Cyclohexanone Formulation 6 Propylene carbonate Formulation 7 Ethyl diglycol WO 00/30596 16 PCT/EP99/08649 The solvents were added in portions to the blonding agent base with shaking between portions. The formulation was then ground in a centrifugal ball mill. All the blonding powders were completely dust-free. In a second series of tests, the following solvents were added in portions to a commercially available blonding agent (Brilliant Blond, Schwarzkopf). The mixture was shaken after each portion and then ground for 10 minutes in a centrifugal ball mill. Dust behavior was investigated in each case. 10% by weight 15% by weight 20% by weight 3-Methoxybutanol Dust-free Dust-free Dust-free Benzyl alcohol Dust Dust-free Dust-free Propane-1,2-diol -- Dust-free Dust-free This series of tests shows that all the samples were dust-free where more than 10% by weight of solvent was added. In many cases, smaller quantities are also sufficient for completely de-dusting the powders. 1. Powder hair colors Carboxymethyl cellulose, sodium salt 22.0% by weight Tartaric acid 10.0% by weight Duponol@ C2 0.5% by weight Sodium perborate, monohydrate 40.0% by weight Sodium sulfate 8.5% by weight 1,4-Diaminobenzene, dihydrochloride 7.0% by weight 2-Aminophenol 1.0% by weight 3-Aminophenol 1.0% by weight Benzyl alcohol 10.0% by weight 2 Sodium lauryl sulfate, powder-form (INCI name: Sodium Lauryl WO 00/30596 17 PCT/EP99/08649 Sulfate) (DuPont) The powder-form hair color was completely dust-free and was thoroughly mixed with water in a ratio of 1:6 and applied to a grey hair tress. After a contact time of 30 mins. at room temperature, the tress was 5 carefully rinsed out, shampooed and dried. The tress was black in color.

Claims (11)

1. The use of at least one solvent liquid at 250C selected from the group of hydrocarbons, alcohols, esters and ketones for de-dusting blonding powders and powder-form dye mixtures containing typical 5 cosmetic ingredients.

2. A powder-form or paste-form agent for blonding human hair based on at least one solid peroxo compound and at least one solid alkali source, characterized in that it contains at least one solvent liquid at 250C selected from the group of hydrocarbons, alcohols, esters and ketones for de 10 dusting.

3. An agent as claimed in claim 2, characterized in that it contains at least one inorganic solid peroxo compound.

4. A powder-form agent for coloring and tinting human hair containing at least one substantive dye and/or at least one oxidation dye precursor, 15 characterized in that, for de-dusting, it contains at least one solvent liquid at 250C selected from the group of hydrocarbons, alcohols, esters and ketones.

5. An agent as claimed in any of claims 2 to 4, characterized in that it contains a compound selected from the group consisting of 3 20 methoxybutanol, benzyl alcohol, propane-1,2-diol, hexanol, cyclohexanone, propylene carbonate and ethyl diglycol as solvent.

6. An agent as claimed in claim 5, characterized in that it contains 3 methoxybutanol, benzyl alcohol or propane-1,2-diol as solvent.

7. An agent as claimed in any of claims 2 to 6, characterized in that it 25 contains the solvent in a quantity of 0.5 to 30% by weight, based on the agent as a whole.

8. An agent as claimed in any of claims 2 to 7, characterized in that it contains a nonionic surfactant in quantities of 0.5 to 10% by weight.

9. An agent as claimed in claim 8, characterized in that it contains a 30 nonionic surfactant selected from WO 00/30596 19 PCT/EP99/08649 - alkoxylated fatty alcohols and fatty acids containing 8 to 22 carbon atoms and 1 to 30 ethylene oxide and/or propylene oxide units which may carry a terminal alkyl group, more particularly a methyl group, at the end of the alkoxy group chain, 5 - alkoxylated mono-, di- and triglycerides, - polyglycerol esters and alkoxylated polyglycerol esters, - sorbitan fatty acid esters and alkoxylated sorbitan fatty acid esters and - alkyl phenols and alkyl phenol alkoxylates containing 6 to 21 carbon atoms in the alkyl chain and 0 to 30 ethylene oxide and/or propylene 10 oxide units.

10. An agent as claimed in any of claims 2 to 9, characterized in that it contains soaps solid at 25 0 C, more particularly sodium stearate, in quantities of 5 to 20% by weight and more particularly in quantities of 10 to 15% by weight, based on the agent as a whole. 15

11. An agent as claimed in any of claims 2 to 10, characterized in that it is free from oils and liquid waxes except perfume oils. '1 N