Powder additive to reduce damage caused by bleaches and colorants

Abstract

A powder additive for coloring, bleaching, or developing keratin fibers is provided. The powder additive comprises a dicarboxylic acid having from about 2 to about 10 carbon atoms selected from the group consisting of malic acid, D-tartaric acid, L-tartaric acid, mesotartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, and sorbic acid, a salt of such a dicarboxylic acid, and a mixture thereof. The powder additive also comprises an amino acid or a salt of an amino acid and an alkali silicate. The powder additive does not contain more than about 10% water by weight of the powder additive. The powder additive further comprises particles, at least about 80% of which have an average particle size of less than 200 μm.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Utility Patent Application 16 / 397,988, filed April 29, 2019, and entitled “Powder Additive for Reducing Damage to Bleaching Agents and Colorants,” which is incorporated herein by reference.

[0002] FIELD OF THEINVENTION The present invention relates to powder additives and methods for their manufacture, and more particularly to powder additives for bleaches and colorants and methods for their manufacture. [Background technology]

[0003] 2. Background of the Invention When colouring or bleaching keratinous fibres such as hair, problems can arise that the harsh chemicals used can damage the keratinous fibres. In particular, the natural hydrophobicity of the keratinous fibres is reduced, since the colouring or lightening agents must first be able to penetrate the fibres in order to be effective. However, with regard to hair, water repellency, on the one hand, gives the hair a natural protection, and on the other hand, is closely linked to the properties that are desirable to the consumer, such as shine, smoothness, feel and "flow" of the hair.

[0004] To overcome the above drawbacks, so-called pretreatment agents are available on the market to protect hair from the harsh effects of coloring and bleaching. However, these pretreatment agents often weigh down the hair and have a negative effect on the success of subsequent hair lightening and coloring, especially in that the color fastness to washing may be impaired by the pretreatment agent. Also, many posttreatment agents are known that are used to repair damage to hair caused by coloring treatments. However, all of these methods require a multi-step application method in which a hair treatment agent is applied either before or after coloring. The coloring process alone requires several work steps and takes a very long time, up to about 60 minutes, which consumers often find troublesome.

[0005] Water-based hair protection ingredients that overcome damage caused by coloring agents and bleaching agents are known. Such ingredients can be added directly to hair before applying coloring agents or bleaching agents, eliminating the need for additional processing steps. However, because these additives are water-based, they are generally formulated to match specific coloring agent, bleaching agent, or chemical product lines, and are not flexible enough to be used with a variety of product lines. In addition, because they are water-based, they require the use of preservatives to maintain their shelf life. Summary of the Invention [Problem to be solved by the invention]

[0006] It would therefore be desirable to provide a powder additive for colorants, bleaches, and developers that reduces damage to hair. Additionally, it would be desirable to provide a method of forming a powder additive for addition to colorants, bleaches, or developers. Additionally, other desirable features and characteristics will become apparent from the ensuing detailed description and appended claims, taken in conjunction with the accompanying description and the foregoing technical field and background. [Means for solving the problem]

[0007] Summary of the Invention According to one embodiment, a powder additive for coloring or bleaching or developing keratin fibers is provided. The powder additive comprises a dicarboxylic acid having about 2 to about 10 carbon atoms selected from the group consisting of malic acid, D-tartaric acid, L-tartaric acid, mesotartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, and sorbic acid, a salt of these dicarboxylic acids, and mixtures thereof. The powder additive also comprises an amino acid or a salt of an amino acid, and an alkali silicate. The powder additive does not contain more than about 10% water based on the weight of the powder additive. Furthermore, the powder additive comprises particles, and at least about 80% of the particles have an average particle size of less than 200 μm.

[0008] According to another embodiment, there is provided a method for producing a powder additive for coloring or bleaching or developing keratin fibers. The method includes combining the following components to form a mixture: a dicarboxylic acid having from about 2 to about 10 carbon atoms selected from the group consisting of malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sorbic acid, salts of these dicarboxylic acids, and mixtures thereof; an amino acid or salt of an amino acid; and an alkali silicate. The method further includes passing the mixture through a first mesh, the first mesh being configured to allow particles of the mixture having an average particle size of less than about 200 microns to pass through. The resulting powder additive has at least 80% particles having an average particle size of less than 200 microns. Additionally, the resulting powdered additive does not contain more than about 10% by weight of water, based on the weight of the resulting powdered additive.

[0009] According to yet another embodiment, a powder additive for coloring or bleaching or developing keratin fibers is provided. The powder additive comprises a dicarboxylic acid having about 2 to about 10 carbon atoms selected from the group consisting of malic acid, D-tartaric acid, L-tartaric acid, mesotartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, and sorbic acid, a salt of these dicarboxylic acids, and mixtures thereof. The powder additive also comprises an amino acid or a salt of an amino acid, an alkali silicate, a protein hydrolyzate, and a polyvalent metal salt. The powder additive does not contain more than about 10% water based on the weight of the powder additive. The powder additive comprises particles, and at least about 80% of the particles have an average particle size of 200 μm or less. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Detailed Description of the Invention The following detailed description is merely exemplary in nature and is not intended to limit the powder additives, methods of forming the powder additives, or the applications and uses of the powder additives contemplated herein. Moreover, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.

[0011] Various embodiments contemplated herein relate to powder additives, particularly powder additives formulated to be added to oxidative or non-oxidative colorants, such as direct dyes, semi-permanent dyes, or permanent dyes, to a bleaching agent, such as a developer that typically includes an oxidizing agent, e.g., hydrogen peroxide, or to a combination of colorant and developer, prior to application to the hair. As such, the powder additives do not require pre-treatment or post-treatment steps associated with actual hair coloring or bleaching. The powder additives act to reduce damage to hair during coloring or bleaching without adversely affecting the final color. Furthermore, as an additive that reduces damage to hair during coloring or bleaching, the powder additives can be presented as an added service to the end consumer and can generate additional revenue for hair salons and stylists.

[0012] The powder additive is particularly novel over the prior art. Because the additive is in powder form and therefore non-aqueous, it can be used in a variety of colorants, bleaches, and developers, and across a variety of product lines. In addition, the powder additive does not require preservatives for sustained storage. In addition, the water-free powder additive is lighter in weight than the water-based additive, which reduces shipping costs and allows it to be stored in smaller containers. Also, the powder additive requires less volume of material to be added to the colorant, bleach, or developer compared to the water-based additive, making it easier to mix the powder additive with the colorant, bleach, or developer and apply the mixture to the hair.

[0013] The powder additive contemplated herein contains up to about 10% by weight, for example up to about 6% by weight, of free water. For the purposes of this application, "free water" refers to water that is not contained in the powder additive in the form of crystallization water, hydration water, or similar molecular-bound water. The content of crystallization water, hydration water, or similar molecular-bound water contained in the ingredients used does not constitute free water as contemplated herein. Free water refers to, for example, water that is added to the composition as a solvent, as a gel active agent, or as a solvent component of other active ingredients, as contemplated herein.

[0014] The powder additive contemplated herein, according to one embodiment, is comprised of particles having an average particle size of at least about 80%, such as at least about 90%, such as at least about 95%, such as 100%, less than 200 microns (μm). It has been found that powder additives formulated as contemplated herein and comprised of particles having an average particle size of at least about 80% less than 200 μm do not cause hair swelling when mixed with colorants, bleaches, and developers applied to the hair. Powder additives formulated herein that do not meet this particle size standard have been shown to cause swelling. "Swelling" refers to a phenomenon in which the aluminum foil "package" on the hair swells due to a chemical reaction between the bleach and the powder additive, creating an unfavorable environment for the dyeing or photoirradiation process, reducing the effectiveness of the dyeing or photoirradiation process. Furthermore, it has been found that powder additives formulated as contemplated herein and comprised of particles having an average particle size of at least about 80% less than 200 μm do not cause hair spotting. Powder additives that do not meet this particle size standard have been shown to cause spotting. "Spotting" refers to the uneven deposition of dye on the hair strand after the colorant, lightener, and developer have been applied and developed on the hair. In reality, larger particles become insoluble during development, causing "spots" to appear on the hair strand.

[0015] In an exemplary embodiment, the powder additive comprises at least one dicarboxylic acid comprising from about 2 to about 10 carbon atoms. Suitable dicarboxylic acids for use in the powder additive are selected from malic acid, D-tartaric acid, L-tartaric acid, mesotartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sorbic acid, salts of these dicarboxylic acids, and mixtures thereof. Preferred dicarboxylic acids include succinic acid, malic acid, maleic acid, and the like. Succinic acid is particularly preferred. In an exemplary embodiment, the powder additive comprises a dicarboxylic acid in an amount of about 20 weight percent (wt.%) to about 80 wt.%, based on the total weight of the powder additive. In another exemplary embodiment, the powder additive comprises a dicarboxylic acid in an amount of about 40 wt.% to about 70 wt.%, based on the total weight of the powder additive.

[0016] Also, according to an exemplary embodiment, the powder additive includes at least one amino acid. The reduced hair damaging effect of the coloring or bleaching agent mixed with the powder additive is due, at least in part, to the aforementioned dicarboxylic acid(s) in combination with at least one amino acid. Examples of amino acids suitable for use in the powder additive contemplated herein include glycine, arginine, lysine, histidine, asparagine, glutamine, cysteine, methionine, tryptophan, serine, alanine, aspartic acid, glutamic acid, isoleucine, leucine, phenylalanine, proline, threonine, tyrosine, valine, and mixtures thereof. Preferred amino acids include lysine and arginine. In one embodiment, the powder additive includes an amino acid in an amount of about 0.01 wt.% to about 10 wt.% based on the total weight of the powder additive, for example, about 0.5 wt.% to about 5 wt.% based on the total weight of the powder additive.

[0017] The powder additive contemplated herein further comprises a neutralizing agent for neutralizing the dicarboxylic acid according to an exemplary embodiment. Suitable neutralizing agents include alkali silicates. Examples of alkali silicates suitable for use as neutralizing agents in the powder additive contemplated herein include sodium silicate, potassium silicate, sodium metasilicate, orthosilicate, and the like, and mixtures thereof. In one embodiment, the powder additive comprises one or more alkali silicates in an amount of about 0.01 wt.% to about 60 wt.% based on the total weight of the powder additive, for example, about 15 wt.% to about 40 wt.% based on the total weight of the powder additive.

[0018] In any embodiment, the powder additive contemplated herein is silica and / or centre The silica and / or fumed silica will bind with the moisture contained in the powder additive and absorb the moisture which can contaminate the powder additive. centre Fumed silica is available, for example, from Evonik Industries AG, Germany, under the trade name "Aerosil®." In one embodiment, the powder additive comprises silica and / or fumed silica in an amount of about 0 wt.% to about 5 wt.%, based on the total weight of the powder additive. centre For example, silica and fumed silica in an amount of from 0.001 wt.% to about 5 wt.%, or from about 0.05 wt.% to about 2.5 wt.%, based on the total weight of the powder additive.

[0019] The silica and / or fumed silica not only absorbs water and moisture, but also acts as a filler, making the powder additive easier to formulate and mix with colorants, bleaches, or developers than would be possible without the silica and / or fumed silica. Other inert organic and non-organic fillers that do not interact with other components of the powder additive contemplated herein may also be used. Suitable such fillers include, for example, clay, limestone, alumina, cellulose, and the like.

[0020] The powder additive may further comprise a protein hydrolysate according to any embodiment. The protein hydrolysate further provides the effect of reducing hair damage by cooperation with the dicarboxylic acid and amino acid mentioned above. Protein hydrolysates of plant, animal and marine origin can be used. Animal protein hydrolysates are, for example, elastin, collagen, keratin, silk and milk protein hydrolysates, which can also be present in the form of salts. Plant-derived protein hydrolysates suitable for use in the powder additive include soybean, almond, rise, pea, potato and wheat protein hydrolysates.

[0021] Furthermore, cationized protein hydrolysates can be used, the basic protein hydrolysates being derived from animals, e.g. collagen, milk or keratin, plants, e.g. wheat, corn, rice, potato, soy or almond, marine organisms, e.g. fish collagen, algae or biotechnologically obtained protein hydrolysates. The protein hydrolysates on which the cationic derivatives are based can be obtained from the corresponding proteins by chemical hydrolysis, in particular alkaline or acid hydrolysis, enzymatic hydrolysis and combinations of both types of hydrolysis. Furthermore, cationic protein hydrolysates are understood to include quaternized amino acids and mixtures thereof. Quaternization of protein hydrolysates and amino acids is often carried out using quaternary ammonium salts, such as, for example, N,N-dimethyl-N-(n-alkyl)-N-(2-hydroxy-3-chloro-n-propyl)ammonium halides. Furthermore, cationic protein hydrolysates can also be further derivatized.

[0022] The powder additive, according to one embodiment, comprises a protein hydrolysate in an amount of about 0 wt.% to about 5 wt.% based on the total weight of the powder additive, hi another embodiment, the powder additive comprises a protein hydrolysate in an amount of about 0.2 wt.% to about 2 wt.% based on the total weight of the powder additive.

[0023] The powder additive contemplated herein may also include a polyvalent metal salt of an organic acid according to one embodiment. The polyvalent metal salt, when combined with the dicarboxylic acid or amino acid described above, provides an additional hair damage reducing effect. Examples of polyvalent metal salts suitable for use in the powder additive contemplated herein include polyvalent metal salts of citric acid, lactic acid, tartaric acid, and the like, such as trimagnesium citrate. In one embodiment, the powder additive includes a polyvalent metal salt in an amount of about 0 wt.% to about 10 wt.% based on the total weight of the powder additive, for example, about 0.1 wt.% to about 5 wt.% based on the total weight of the powder additive.

[0024] Optionally, the powder additives considered herein may contain saturated non-volatile oils. These oils serve to de-dust the components of the powder additive. In the case of cosmetic oils, a distinction is made between volatile and non-volatile oils. Non-volatile oils are understood to mean oils that have a vapor pressure of less than 2.66 Pa (0.02 mmHg) at 20° C. and an ambient pressure of about 1013 hPa. Volatile oils are understood to mean oils that have a vapor pressure of about 2.66 Pa to about 40000 Pa (about 0.02 mm to about 300 mmHg) at a temperature of 20° C. and an ambient pressure of about 1013 hPa.

[0025] Oils suitable for use as contemplated herein include ester oils, such as triethyl citrate. Other examples of suitable ester oils include esters of linear or branched saturated fatty alcohols having 2 to 30 carbon atoms and linear or branched saturated fatty acids having 2 to 30 carbon atoms, which may be hydroxylated. Specific examples include isopropyl palmitate, isopropyl stearate, isopropyl myristate, 2-hexyldecyl stearate, 2-hexyldecyl laurate, isodecyl neopentanoate, isononyl isononanoate, 2-ethylhexyl palmitate, 2-ethylhexyl stearate, and the like. Also suitable are isopropyl isostearate, isooctyl stearate, isononyl stearate, isocetyl stearate, isononyl isononanoate, isotridecyl isononanoate, cetearyl isononanoate, 2-ethylhexyl laurate, 2-ethylhexyl isostearate, 2-octyldodecyl palmitate, butyl octanoate, 2-butyrotanol, n-butyl stearate, n-hexyl laurate, and ethylene glycol dipalmitate.

[0026] Further suitable oils contemplated herein are linear or branched C 2 -C 10 and dicarboxylic acid esters of -alkanols, such as diisopropyl adipate, di-n-butyl adipate, di-(2-ethylhexyl) adipate, dioctyl adipate, diethyl / di-n-butyl / dioctyl sebacate, diisopropyl sebacate, dioctyl malate, diisooctyl succinate, di-2-ethylhexyl succinate, and di-(2-hexyldecyl) succinate.

[0027] Additionally, the addition products of about 1 to about 5 propylene oxide units to monohydrate or polyhydrate C8-C22 alkanols, such as octanol, decanol, decanediol, lauryl alcohol, myristyl alcohol, stearyl alcohol, and the like, are suitable oils contemplated herein, such as PPG-2 myristyl ether, PPG-3 myristyl ether, and the like.

[0028] Further suitable oils contemplated herein are mono- or polyhydric C glycerol, butanol, butanediol, myristyl alcohol, stearyl alcohol, etc. 3 -C 22 The oils are selected from the addition products of at least six ethylene oxide and / or propylene oxide units to an alkanol, optionally esterified. Examples of such oils include PPG-14-butyl ether, PPG-9-butyl ether, PPG-10-butanediol, PPG-15 stearyl ether, glycereth-7 diisononanoate, etc.

[0029] Other suitable oils are mineral oil, paraffin oil, C 18 -C 30 Suitable oils include natural and synthetic hydrocarbons such as isoparaffins. 8 -C 16 Isoparaffins, particularly isodecane, isododecane, isotetradecane, isohexadecane, and mixtures thereof, and 1,3-di(2-ethylhexyl)cyclohexane are included.

[0030] Natural oils are also suitable for use in the powder additive described herein.Examples of natural oils suitable for use herein are selected from amaranth oil, apricot kernel oil, argan oil, avocado oil, babassu oil, cottonseed oil, borage seed oil, camelina oil, thistle oil, peanut oil, pomegranate kernel oil, grapefruit seed oil, hemp oil, hazelnut oil, locust seed oil, jojoba oil, linseed oil, macadamia nut oil, corn oil, almond oil, marilla oil, evening primrose oil, olive oil, palm oil, palm kernel oil, paranut oil, pecan oil, peach kernel oil, rapeseed oil, castor oil, hawthorn fruit oil, sand kernel oil, sesame oil, soybean oil, sunflower oil, grape seed oil, walnut oil, wild rose oil, wheat germ oil, coconut oil and other liquid fractions.

[0031] Other oils suitable for use in the powder additives contemplated herein include non-volatile silicone oils. Suitable non-volatile silicone oils include linear polyalkylsiloxanes, such as polydimethylsiloxane, and cetyl dimethicone.

[0032] The powder additive, according to one embodiment, comprises non-volatile saturated oil in an amount of about 0 wt.% to about 12 wt.% based on the total weight of the powder additive, hi another embodiment, the powder additive comprises non-volatile saturated oil in an amount of about 0.01 wt.% to about 5 wt.% based on the total weight of the powder additive.

[0033] As mentioned above, the powder additives contemplated herein are formulated to be added to a colorant, a bleaching agent, a developer containing an oxidizing agent such as hydrogen peroxide, or a combination of a colorant, a bleaching agent, and a developer prior to application to hair. Thus, the powder additive need not contain dye precursors, direct dyes, oxidizing agents, etc. In this regard, in one embodiment, when the powder additive contains a dye precursor, a direct dye, and / or an oxidizing agent, these components are present in amounts such that they do not play a role in contributing to the coloring or bleaching of the colorant or bleaching agent and / or developer to which the powder additive is added. In one embodiment, the powder additive does not contain a dye precursor, a substantial dye, or an oxidizing agent.

[0034] As mentioned above, the powder additive contemplated herein contains up to about 10% by weight, preferably up to about 6% by weight, of free water. In this respect, the powder additive is substantially non-aqueous. Therefore, a preservative is not required to maintain the quality or extend the shelf life of the powder additive. In one embodiment, if the powder additive contains a preservative, the powder additive contains an amount of the preservative such that the preservative does not provide a preservative effect. In one embodiment, the powder additive does not contain a preservative.

[0035] Also described herein is a method for producing a powder additive for bleaches and colorants. According to an exemplary embodiment, the method includes passing each of the dry ingredients used in the powder additive, separately or together, through a grinder, sieve, or mesh. The dry ingredients include the ingredients described above, except for the non-volatile saturated oil. The grinder, sieve, or mesh is configured to allow particles with an average particle size of less than 200 μm to pass through. Separation of the particles can be performed using common sieves and grinders, such as, for example, tumblers, shakers, vibrating sieves, hammer mills, ball mills, and the like. Commercial embodiments of suitable mills, sieves, and meshes are available, for example, from Retsch GmbH, Germany.

[0036] The method, according to one embodiment, continues by adding the dry components of the powder additive in any desired order and mixing the components during and / or after addition until a homogenous mixture is obtained. Mixing can be continued in conjunction with the addition of a component or can be stopped before and resumed after the addition of a component.

[0037] In one optional embodiment, the oil is sprayed or otherwise applied to the dry ingredients during or after mixing of the dry ingredients. If the oil is solid at room temperature, it is first heated to a liquid state and then sprayed or applied to the dry ingredients. The dry ingredients are stirred while the oil is being applied. Thus, the oil can be applied to the dry ingredients while they are being combined.

[0038] In another exemplary embodiment, after the ingredients are combined, the mixture is passed through a grinder, sieve, or mesh. The grinder, sieve, or mesh is configured to allow particles with an average particle size of less than 200 μm to pass through. It will be appreciated that according to another exemplary embodiment, the ingredients can be passed through a grinder, sieve, or mesh both before and after mixing, or according to yet another exemplary embodiment, once either before or after mixing.

[0039] The following are exemplary embodiments of the powder additive contemplated herein, with each component listed as a weight percent of the total weight of the powder additive. This example is provided for illustrative purposes only and is not intended to limit the various embodiments of the powder additive in any way. The powder additive of the following exemplary embodiment comprises particles, at least 80% of which have an average particle size of less than 200 μm. EXAMPLES

[0040] Working Example Component Wt.% Sodium silicate 29.0000 SiO 2 :Na 2 O=2.0 Succinic acid 60.0000 Lysine HCl 2.0000 L-Arginine 2.0000 Trimagnesium Citrate 3.0000 Silicic acid pyrogen 1.0000 Glycine 2.0000 Keratin Powder 1.0000 Total 100%

[0041] While the foregoing detailed description has set forth at least one exemplary embodiment, it should be understood that a vast number of variations exist. It should also be understood that the exemplary embodiment or exemplary embodiments are merely illustrative and are not intended to limit the scope, applicability, or configuration of the subject matter in any manner. Rather, the foregoing detailed description provides those skilled in the art with a convenient road map for implementing the exemplary embodiments, and it will be understood that various changes can be made in the function and arrangement of elements described in the exemplary embodiments without departing from the scope set forth in the appended claims and their legal equivalents. Preferred aspects of the invention include the following. [1] A powder additive for coloring, bleaching or developing keratin fibers, comprising: dicarboxylic acids containing from about 2 to about 10 carbon atoms selected from the group consisting of malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sorbic acid, salts of these dicarboxylic acids, and mixtures thereof; an amino acid or a salt of an amino acid; and Alkaline silicates; Including, wherein the powder additive does not contain more than about 10% water, based on the weight of the powder additive; and The powder additive comprises particles, at least about 80% of the particles having an average particle size of less than 200 μm. [2] The powder additive according to [1], wherein the powder additive does not have more than about 6% by weight of water based on the weight of the powder additive. [3] The powder additive according to [1], wherein the dicarboxylic acid is present in an amount of about 20% by weight to about 80% by weight based on the total weight of the powder additive. [4] The powder additive according to [1], wherein the amino acid or the salt of the amino acid is selected from the group consisting of lysine and arginine. [5] The powder additive according to [1], wherein the amino acid or amino acid salt is present in an amount of about 0.01% by weight to about 10% by weight based on the total weight of the powder additive. [6] The powder additive according to [1], wherein the alkali silicate is present in an amount of about 0.01% by weight to about 60% by weight, based on the total weight of the powder additive. [7] The powder additive according to [1], further comprising silica, fumed silica, or both. [8] The powder additive according to [1], wherein the silica, fumed silica, or both are present in an amount of about 0% by weight to about 5% by weight, based on the total weight of the powder additive. [9] The powder additive according to [1], further comprising a protein hydrolysate.

[10] The powder additive according to [1], wherein the protein hydrolysate is present in an amount of about 0% by weight to about 5% by weight, based on the total weight of the powder additive.

[11] The powder additive according to [1], further comprising a polyvalent metal salt of an organic acid.

[12] The powder additive according to [1], further comprising a saturated non-volatile oil.

[13] The powder additive according to [1], containing 0% by weight of a preservative.

[14] A method for producing a powder additive for coloring, bleaching or developing keratin fibers, comprising the steps of: Ingredients include: dicarboxylic acids containing from about 2 to about 10 carbon atoms selected from the group consisting of malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sorbic acid, salts of these dicarboxylic acids, and mixtures thereof; an amino acid or a salt of an amino acid; and Alkaline silicate to form a mixture; and passing the mixture through a first mesh, the first mesh configured to pass particles of the mixture having an average particle size of less than about 200 microns. Including, wherein the resulting powder additive is at least 80% particles having an average particle size of less than 200 microns; and The method wherein the resulting powdered additive does not contain more than about 10% water by weight, based on the weight of the resulting powdered additive. 15. The method of claim 14, further comprising passing each component separately through a second mesh prior to combining, the second mesh being configured to pass particles of the component having an average particle size of less than 200 microns. 16. The method of claim 14, wherein the step of combining ingredients to form a mixture comprises combining a dicarboxylic acid having from about 2 to about 10 carbon atoms, an amino acid or a salt of an amino acid, an alkali silicate, and silica, fumed silica, or both. 17. The method of claim 14, wherein the step of combining ingredients to form a mixture comprises combining a dicarboxylic acid containing from about 2 to about 10 carbon atoms, an amino acid or a salt of an amino acid, an alkali silicate, and a protein hydrolysate. 18. The method of claim 14, wherein the step of combining ingredients to form a mixture comprises combining a dicarboxylic acid having from about 2 to about 10 carbon atoms, an amino acid or a salt of an amino acid, an alkali silicate, and a polyvalent metal salt of an organic acid.

[19] The method of

[14] , further comprising applying a saturated non-volatile oil to the components during or after combining.

[20] A powder additive for coloring, bleaching or developing keratin fibers, comprising: dicarboxylic acids containing from about 2 to about 10 carbon atoms selected from the group consisting of malic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, racemic acid, α-ketoglutaric acid, β-ketoglutaric acid, oxaloacetic acid, maleic acid, fumaric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sorbic acid, salts of these dicarboxylic acids, and mixtures thereof; Amino acids or salts of amino acids; Alkaline silicates; Protein hydrolysates; and Polyvalent metal salts; Including, wherein the powder additive does not contain more than about 10% water, based on the weight of the powder additive; and The powder additive comprises particles, at least about 80% of the particles having an average particle size of less than 200 μm.

Claims

1. A powder additive for coloring or bleaching or developing keratin fibers, the powder additive comprising: 20% to 80% by weight, based on the weight of the powder additive, of a dicarboxylic acid selected from the group consisting of malic acid, maleic acid, succinic acid, salts of these dicarboxylic acids, and mixtures thereof; 0.01% to 10% by weight, based on the weight of the powder additive, of an amino acid selected from the group consisting of lysine, arginine, glycine or salts thereof and mixtures thereof; and 0.01% to 60% by weight, based on the weight of the powder additive, of an alkali silicate selected from the group consisting of sodium silicate, potassium silicate, sodium metasilicate, orthosilicates, and mixtures thereof; Including, wherein the powder additive does not contain more than 10% water, based on the weight of the powder additive; and A powder additive, wherein at least 80% of the powder additive is made up of particles having an average particle size of less than 200 μm.

2. 10. The powder additive of claim 1, wherein the powder additive does not have more than 6% water by weight based on the weight of the powder additive.

3. 2. The powder additive of claim 1, wherein the dicarboxylic acid is present in an amount of from 40% to 70% by weight, based on the total weight of the powder additive.

4. 2. The powder additive of claim 1, wherein the amino acid or salt of an amino acid is present in an amount of 0.5% to 5% by weight, based on the total weight of the powder additive.

5. 2. The powder additive of claim 1, wherein the alkali silicate is present in an amount of from 15% to 40% by weight, based on the total weight of the powder additive.

6. 2. The powder additive of claim 1, wherein the content of silica, fumed silica, or both is from 0% to 5% by weight, based on the total weight of the powder additive.

7. The powder additive of claim 1, wherein the content of silica, fumed silica, or both is from 0.05% to 2.5% by weight, based on the total weight of the powder additive.

8. 2. The powder additive according to claim 1, wherein the content of the protein hydrolysate is 0% by weight to 5% by weight, based on the total weight of the powder additive.

9. 2. The powder additive according to claim 1, wherein the content of the protein hydrolysate is 0.2% by weight to 2% by weight, based on the total weight of the powder additive.

10. 2. The powder additive according to claim 1, wherein the content of the polyvalent metal salt of an organic acid is 0% by weight to 10% by weight based on the total weight of the powder additive.

11. 2. The powder additive of claim 1, wherein the content of the saturated non-volatile oil is from 0% to 12% by weight, based on the total weight of the powder additive.

12. A powder additive as described in claim 1, which does not contain any preservatives.

13. 1. A method for producing a powder additive for coloring or bleaching or developing keratin fibers, comprising the steps of: Ingredients below: 20% to 80% by weight, based on the weight of the powder additive, of a dicarboxylic acid selected from the group consisting of malic acid, maleic acid, succinic acid, salts of these dicarboxylic acids, and mixtures thereof; 0.01% to 10% by weight, based on the weight of the powder additive, of an amino acid selected from the group consisting of lysine, arginine, glycine, salts thereof and mixtures thereof; and 0.01% to 60% by weight, based on the weight of the powder additive, of an alkali silicate selected from the group consisting of sodium silicate, potassium silicate, sodium metasilicate, orthosilicates, and mixtures thereof. combining to form a mixture; and passing the mixture through a first mesh, the first mesh configured to pass particles of the mixture having an average particle size of less than 200 microns; Including, wherein the resulting powder additive is composed of particles having an average particle size of at least 80% less than 200 microns; and The method of claim 1, wherein the resulting powder additive does not contain more than 10% water by weight, based on the weight of the resulting powder additive.

14. 14. The method of claim 13, further comprising passing each component separately through a second mesh prior to combining, the second mesh being configured to pass particles of the component having an average particle size of less than 200 microns.

15. 14. The method of claim 13, wherein the step of combining ingredients to form a mixture comprises combining a dicarboxylic acid, an amino acid, an alkali silicate, and silica, fumed silica, or both.

16. 14. The method of claim 13, wherein the step of combining ingredients to form a mixture comprises combining a dicarboxylic acid, an amino acid, an alkali silicate, and a protein hydrolysate.

17. 14. The method of claim 13, wherein the step of combining ingredients to form a mixture comprises combining a dicarboxylic acid, an amino acid, an alkali silicate, and a polyvalent metal salt of an organic acid.

18. 14. The method of claim 13, further comprising applying a saturated, non-volatile oil to the ingredients during or after combining.

19. A powder additive for coloring or bleaching or developing keratin fibers, the powder additive comprising: 20% to 80% by weight, based on the weight of the powder additive, of a dicarboxylic acid selected from the group consisting of malic acid, maleic acid, succinic acid, salts of these dicarboxylic acids, and mixtures thereof; 0.01% to 10% by weight, based on the weight of the powder additive, of an amino acid selected from the group consisting of lysine, arginine, glycine, salts thereof and mixtures thereof; 0.01% to 60% by weight, based on the weight of the powder additive, of an alkali silicate selected from the group consisting of sodium silicate, potassium silicate, sodium metasilicate, orthosilicates, and mixtures thereof; Protein hydrolysates; and Polyvalent metal salts of organic acids; Including, wherein the powder additive does not contain more than 10% water, based on the weight of the powder additive; and A powder additive, wherein at least 80% of the powder additive is made up of particles having an average particle size of less than 200 μm.