Multi-component packaging unit comprising a first preparation (a) having peroxodisulphate, di- or tricarboxylic acid and amino acid and a second preparation (b) having carbamide peroxide

Abstract

The present invention relates to a multi-component packaging unit (kit-of-parts) for lightening keratinous fibres, said packaging unit comprising at least two separately packaged preparations (A) and (B), wherein - preparation (A) contains (a1) at least one peroxodisulphate, (a2) at least one di- or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid, and (a3) at least one amino acid, and - preparation (B) contains (b1) carbamide peroxide.

Description

[0001] Multi-component packaging unit comprising a first preparation (A) with peroxodisulfate, di- or tricarboxylic acid and amino acid and a second preparation (B) with carbamide peroxide

[0002] The present invention is in the field of cosmetics and relates to a multi-component packaging unit (kit of parts) for lightening keratin fibers, which comprises at least two preparations (A) and (B). The first preparation (A) contains at least one peroxodisulfate, at least one di- or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid, and at least one amino acid. The second preparation (B) is characterized by its content of carbamide peroxide.

[0003] Changing the shape and color of hair represents an important area of ​​modern cosmetics. In addition to coloring, lightening one's hair color, or bleaching, is a particular desire of many consumers, as blonde hair is considered attractive and fashionable. Various bleaching products with varying bleaching power are available for this purpose.

[0004] The oxidizing agents contained in bleaching products are capable of lightening the hair fiber through the oxidative destruction of the hair's natural pigment, melanin. The oxidizing agent of choice in cosmetic products is hydrogen peroxide. For a moderate bleaching effect, hydrogen peroxide—optionally with the addition of ammonia or other alkalizing agents—is sufficient as the oxidizing agent alone. To achieve a stronger bleaching effect, a mixture of hydrogen peroxide and peroxodisulfate salts and / or peroxomonosulfate salts is typically used.

[0005] For stability reasons, hydrogen peroxide is not used as a solid, but rather in the form of an aqueous solution. However, at the alkaline pH values ​​required for bleaching, aqueous hydrogen peroxide solutions are unstable, so commercially available oxidative bleaching products usually consist of at least two components. The first component is an acidic aqueous oxidizing agent preparation containing hydrogen peroxide, often referred to as developer solution for short. This is mixed with a bleaching powder shortly before use. The bleaching powder usually contains one or more persoxodisulfate salts and at least one solid alkalizing agent. The hydrogen peroxide content in the aqueous developer solution generally does not exceed 12% by weight.Small amounts of other ingredients such as acidifiers, complexing agents and stabilizers are also included, but the main component of the developer solution is water.

[0006] Due to the high water content, the developer solutions must be packaged in relatively bulky bottles or containers, and more packaging material is also required for the outer packaging. Furthermore, transporting the corresponding products consumes more space and energy. As users increasingly place greater value on ecologically sustainable products, there has been a long-standing search for hair bleaching products that achieve sufficiently high bleaching performance while avoiding the use of a water-based developer solution, allowing for resource-efficient packaging and transport.

[0007] If water-based developer solutions are not required, the developer can be packaged in solid, powder, or paste form. This involves using a solid-state oxidizing agent that, when mixed with water, splits off or releases hydrogen peroxide. Several approaches to this packaging form already exist in the state of the art.

[0008] DE 10 2016 219 868 A1, for example, proposes a bleaching agent based on two solid components, each packaged in a chamber of a water-soluble pouch. The first component contains potassium peroxodisulfate and ammonium peroxodisulfate, and the second component comprises a solid oxidizing agent from the group consisting of percarbamide, percarbonate, and perborate. To prepare the ready-to-use product, this two-chamber pouch is placed in water.

[0009] In DE 195 43 989 A1, two solid agents are mixed with water to produce the ready-to-use bleaching agent. The first agent is urea peroxide (i.e., carbamide peroxide or percarbamide), and the second agent is a bleaching powder containing persalts, an alkaline salt, and certain polymers.

[0010] In WO 2014 / 029657 A2, the two components of the bleaching agent are compressed into a multi-layer tablet containing persulfates in a first layer and a hydrogen peroxide releaser (including urea peroxide) in a second layer. This tablet is dissolved in water for application. While these bleaching processes eliminate the need for a water-based developer solution, their bleaching performance still requires further improvement. Furthermore, it has been shown that hair damage with the bleaching products available in solid form, as known from the prior art, is still far too high.

[0011] The object of the present invention was therefore to find bleaching agents based on two solid preparations that can be mixed with water to create the application mixture and that thereby offer improved lightening performance. Hair damage should be minimized.

[0012] Surprisingly, it has now been found that this problem can be solved if a multi-component packaging unit with two separate preparations (A) and (B) is used for bleaching, wherein the preparation (A) contains the combination of at least one peroxodisulfate, at least one organic di- or tricarboxylic acid and one amino acid, and the composition (B) contains carbamide peroxide.

[0013] A first subject of the present invention is a multi-component packaging unit (kit-of-parts) for lightening keratin fibers, comprising at least two separately packaged preparations (A) and (B), wherein

[0014] - the preparation (A) contains

[0015] (a1) at least one peroxodisulfate, and

[0016] (a2) at least one di- or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid, and

[0017] (a3) at least one amino acid, and

[0018] - the preparation (B) contains

[0019] (b1) Carbamide peroxide.

[0020] Keratin fibers

[0021] Keratin fibers, or keratin fibers, include fur, wool, feathers, and especially human hair. Although these products are primarily suitable for lightening keratin fibers, there is nothing in principle to prevent their use in other areas as well.

[0022] Agents for lightening keratin fibers

[0023] The term "lightening of keratin fibers" used in the invention encompasses any form of color change of the fibers in which the keratin fibers have a lighter color than the color they had before application of the agent. This particularly includes the color changes known as lightening, bleaching, and bleaching. The lightening of the hair color is achieved by the oxidizing agent(s) present in the agent. In addition to the oxidizing agent(s), the agents according to the invention can also contain coloring components, such as oxidation dye precursors and / or direct dyes, for the purpose of shading. The coloring components can slightly modify the color loss of the resulting coloration.According to the invention, however, these color-imparting components are contained in the product in such small quantities that the color impression of the keratin fibers treated with the product is still lighter than their original color. Corresponding coloring techniques can be referred to as coloring bleaching or nuanced bleaching.

[0024] Kit of parts

[0025] The multi-component packaging unit according to the invention comprises the two separate preparations (A) and (B).

[0026] The first preparation (A) contains the peroxodisulfates and can be in solid, powder, or paste form. Preparation (A) can also be referred to as bleaching powder or bleaching paste.

[0027] The second preparation (B) contains carbamide peroxide, a substance that releases or splits off hydrogen peroxide when mixed with water. Preparation (B) can be in solid, powder, or paste form. Alternatively, preparation (B) can also be referred to as a solid developer.

[0028] The first subject matter of the present invention is therefore preferably a multi-component packaging unit (kit-of-parts) for lightening keratin fibers, comprising at least two separately packaged preparations (A) and (B), wherein

[0029] - the preparation (A) is solid, powdery or pasty at room temperature (20 °C) and contains

[0030] (a1) at least one peroxodisulfate, and

[0031] (a2) at least one di- or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid, and

[0032] (a3) at least one amino acid, and

[0033] - the preparation (B) is solid, powdery or pasty at room temperature (20 °C) and contains

[0034] (b1) Carbamide peroxide.

[0035] Room temperature is defined as 20°C. A preparation is solid at room temperature (20°C and 1013 mbar) if it is not fluid at that temperature.

[0036] For the purposes of the present invention, powdered agents are understood to mean agents consisting of comminuted, solid components, whereby the comminution can be achieved by grinding, crushing, milling, or by spray drying or freeze-drying. Powders composed of solid components with different grain sizes can be used. However, it may usually be preferred for the powders to have a grain size that is as homogeneous as possible, particularly to facilitate uniform dispersion or dissolution of the powders in water.

[0037] According to the invention, the terms "paste" or "paste-like" refer to a dosage form that has a viscosity at 20°C and 1013 mbar in the range of 200,000 to 1,600,000 mPas, preferably 250,000 to 1,400,000 mPas, particularly preferably 300,000 to 1,000,000 mPas, and most preferably 400,000 to 750,000 mPas. The paste viscosity is preferably determined using a Brookfield RVDF II+ instrument, spindle no. 96, 4 revolutions per minute, at 20°C.

[0038] Preparations (A) and / or (B) can preferably be packaged in packaging suitable for solids, shaped bodies, powders, and / or pastes, such as containers, bottles, cans, blisters, or optionally coated cartons. Both preparations (A) and / or (B) can also be packaged in a film and provided in the form of one or more pouches, wherein the pouch may comprise one or more chambers.

[0039] In addition to the preparations (A) and (B), the kit-of-parts according to the invention can optionally also contain further preparations such as a pretreatment agent, a post-treatment agent and / or a conditioner.

[0040] Preparation (A)

[0041] The preparation (A) is preferably solid, powdery or pasty at room temperature and contains the combination of at least one peroxodisulfate (a1), at least one di- or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid (a2), and at least one amino acid (a3).

[0042] According to the invention, the components (a1), (a2) and (a3) ​​are structurally different. In particular, the di- or tricarboxylic acid having 2 to 20 carbon atoms (a2) and the amino acid (a3) ​​are structurally different compounds. Thus, a preparation (A) according to the invention is characterized in that it contains

[0043] (a1) at least one peroxodisulfate, and

[0044] (a2) at least one di- or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid, and

[0045] (a3) at least one amino acid which is structurally different from the di- or tricarboxylic acids (a2).

[0046] Peroxodisulfates in preparation (A)

[0047] Preparation (A) contains at least one peroxodisulfate (a1). Particularly suitable peroxodisulfates according to the invention are ammonium peroxodisulfate, potassium peroxodisulfate, and sodium peroxodisulfate.

[0048] Ammonium peroxodisulfate, which can also be referred to as ammonium persulfate, is the persulfate with the molecular formula (NH4)2S2Os and the CAS number 7727-54-0.

[0049] Potassium peroxodisulfate, which can also be referred to as potassium persulfate, is the persulfate with the molecular formula K2S2O8 and the CAS number 7727-21-1.

[0050] Sodium peroxodisulfate, which can also be referred to as sodium persulfate, is the persulfate with the molecular formula Na2S2Os and the CAS number 7775-27-1.

[0051] In a particularly preferred embodiment, the multi-component packaging unit according to the invention is characterized in that the preparation (A) contains at least one peroxodisulfate (a1) from the group consisting of ammonium peroxodisulfate, potassium peroxodisulfate and / or sodium peroxodisulfate.

[0052] The persulfate(s) are also preferably used in specific amount ranges in preparation (A). It has been found to be preferred if preparation (A) contains one or more peroxodisulfates (a1) in a total amount of 10.0 to 80.0 wt.%, preferably 20.0 to 70.0 wt.%, more preferably 25.0 to 60.0 wt.%, even more preferably 30.0 to 55.0 wt.%, and most preferably 35.0 to 50.0 wt.%, based on the total weight of preparation (A).

[0053] Very particularly preferably, the preparation (A) contains - based on the total weight of the preparation (A) - the combination of ammonium peroxodisulfate and potassium peroxodisulfate (a1) in a total amount of 10.0 to 80.0 wt.%, preferably 20.0 to 70.0 wt.%, more preferably 25.0 to 60.0 wt.%, even more preferably 30.0 to 55.0 wt.% and very particularly preferably 35.0 to 50.0 wt.%.

[0054] In a particularly preferred embodiment, the multi-component packaging unit according to the invention is characterized in that the preparation (A) - based on the total weight of the preparation (A) - contains one or more peroxodisulfates (a1), in particular ammonium peroxodisulfate and potassium peroxodisulfate, in a total amount of 10.0 to 80.0 wt. %, preferably 20.0 to 70.0 wt. %, more preferably 25.0 to 60.0 wt. %, even more preferably 30.0 to 55.0 wt. % and most preferably 35.0 to 50.0 wt. %.

[0055] Di- or tricarboxylic acid with 2 to 20 carbon atoms in preparation (A)

[0056] As the second component (a2) essential to the invention, the preparation (A) contains at least one dicarboxylic or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid.

[0057] Dicarboxylic acids are organic acids with two carboxyl groups (-COOH groups). Tricarboxylic acids are organic acids with three carboxyl groups (-COOH groups).

[0058] The salts of these compounds are also within the scope of the invention. Particularly suitable are physiologically acceptable salts such as the sodium salts, the potassium salts, and / or the ammonium salts of the acids.

[0059] In addition to the carboxy groups, the carboxylic acid may also carry other functional groups such as one or more hydroxy groups, carbonyl groups and / or one or more branching Ci-Ce alkyl groups (provided that the number of all C atoms of the acid is between 2 and 20 carbon atoms).

[0060] According to the invention, the organic acid comprises 2 to 20 carbon atoms, with the carbon atoms of the carboxyl groups present being included in this count. An example of a dicarboxylic acid with 2 carbon atoms is oxalic acid. With a chain length of 4 carbon atoms or more, the di- or tricarboxylic acids according to the invention can also be unsaturated, i.e., contain one or more double bonds.

[0061] The di- or tricarboxylic acids (a2) from the group consisting of succinic acid, maleic acid, fumaric acid, malic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, grape acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, citric acid, and their salts have proven particularly suitable according to the invention. These acids (a2), in combination with the amino acids (a3), demonstrated a particularly good improvement in bleaching performance when used in the kit of parts according to the invention.

[0062] The strongest lightening combined with the greatest possible hair protection was achieved with succinic acid or the salts of succinic acid (a2), therefore this acid is explicitly preferred.

[0063] In a further particularly preferred embodiment, the multi-component packaging unit according to the invention is characterized in that the preparation (A) contains at least one di- or tricarboxylic acid having 2 to 20 carbon atoms (a2), which is selected from the group consisting of succinic acid, maleic acid, fumaric acid, malic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, grape acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, citric acid and salts thereof, preferably selected from succinic acid, malic acid, maleic acid, fumaric acid and salts thereof, particularly preferably selected from succinic acid and salts thereof.

[0064] The succinic acid particularly preferred according to the invention has a melting point in the range of 185-187°C at 1013 mbar, thus being a solid at 20°C. Succinic acid is alternatively also referred to as 1,4-butanedioic acid and has the CAS number 110-15-6. Suitable salts of succinic acid according to the invention are selected from the succinates and hydrogen succinates of ammonium ions, alkali metal ions, alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. The succinic acid salts mentioned may also contain bound water of crystallization, in particular sodium succinate hexahydrate, which is particularly preferred according to the invention.

[0065] Maleic acid is an unsaturated acid known as cis-butenedioic acid or (2Z)-but-2-enedioic acid. Maleic acid has the CAS number 110-16-7. Maleic acid has a melting point of 130 to 131 °C (from ethanol or benzene) and 138 to 139 °C (from water) at 1013 mbar. Suitable salts of maleic acid according to the invention are selected from the maleates and hydrogen maleates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0066] Fumaric acid is an unsaturated acid known as trans-butenedioic acid or trans-ethylenedicarboxylic acid. Fumaric acid has the CAS number 110-17-8. Fumaric acid has a melting point of 287°C in a sealed tube at 1013 mbar; fumaric acid sublimes at 200°C. Suitable fumaric acid salts according to the invention are selected from the fumarates and hydrogen fumarates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0067] Malic acid is also alternatively known as 2-hydroxysuccinic acid or 2-hydroxy-1,4-butanedioic acid. Malic acid is optically active. The enantiomers D-malic acid and L-malic acid each have a melting point in the range of 100–101 °C at 1013 mbar. For cost reasons, racemic DL-malic acid is preferred. Malic acid is assigned the CAS numbers 6915-15-7 (DL-malic acid), 97-67-6 (L-malic acid), and 636-61-3 (D-malic acid). All of these stereoisomers are within the scope of the invention. Malic acid salts suitable according to the invention can be selected from the malates and hydrogen malates of ammonium ions, alkali metal ions, alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium and calcium ions, as well as mixtures of these salts, in particular disodium malate and dipotassium malate, but also calcium malate.The malic acid salts mentioned which are suitable according to the invention may contain bound water of crystallization, in particular disodium malate hemihydrate and disodium malate trihydrate.

[0068] Oxalic acid has the alternative name ethanedioic acid and the CAS number 144-62-7 (anhydrous acid). Oxalic acid can also exist in the form of a dihydrate with the CAS number 6153-56-6. Oxalic acid has a melting point of 189.5 °C (anhydrous) at 1013 mbar, or a melting point of 101.5 °C as a dihydrate. Suitable salts of oxalic acid according to the invention are selected from the oxalates and hydrogen oxalates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0069] Malonic acid is also alternatively known as propanedioic acid. Malonic acid has the CAS number 141-82-2. Malonic acid has a melting point of 135 °C at 1013 mbar. Suitable salts of malonic acid according to the invention are selected from the malates and hydrogen malates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0070] Adipic acid is also alternatively referred to as 1,6-hexanedioic acid and has the CAS number 124-04-9. Adipic acid has a melting point of 152 °C at 1013 mbar. Suitable salts of adipic acid according to the invention are selected from the adipates and hydrogenadipates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0071] Pimelic acid is a diacid containing 7 carbon atoms. Pimelic acid is also alternatively known as heptanedioic acid and has the CAS number 111-16-0. Pimelic acid has a melting point of 105°C at 1013 mbar. Salts of pimelic acid suitable for the invention are selected from the pimelates and hydrogen pimelates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0072] Suberic acid is a diacid containing 8 carbon atoms. Suberic acid is also known as octanedioic acid and has the CAS number 505-48-6. Suberic acid has a melting point of 144 °C at 1013 mbar. Salts of suberic acid suitable for the invention are selected from the suberates and hydrogen suberates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0073] Azelaic acid is a diacid containing 9 carbon atoms. Azelaic acid is also known as nonanedioic acid and has the CAS number 123-99-9. Azelaic acid has a melting point of 106°C at 1013 mbar. Suitable salts of azelaic acid according to the invention are selected from the azelates and hydrogen azelates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0074] Sebacic acid is a diacid containing 10 carbon atoms, alternatively known as decanedioic acid. Sebacic acid has the CAS number 111-20-6. Sebacic acid has a melting point of 134.5 °C at 1013 mbar. Suitable salts of sebacic acid according to the invention are selected from the sebacates and hydrogen sebacates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0075] Tartaric acid is alternatively also referred to as 2,3-dihydroxysuccinic acid or 2,3-dihydroxybutanedioic acid. Tartaric acid has the CAS number 525-83-0. Tartaric acid has two optical centers and therefore occurs in the form of various stereoisomers. The stereoisomers D-tartaric acid, L-tartaric acid, meso-tartaric acid, and mixtures thereof are encompassed by this invention. D-tartaric acid and L-tartaric acid have a melting point of 168–170°C at 1013 mbar. Salts of D-tartaric acid or L-tartaric acid suitable for the invention are selected from the tartrates and hydrogen tartrates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Meso-tartaric acid has a melting point of 140°C at 1013 mbar.Salts of meso-tartaric acid suitable for the invention are selected from the tartrates and hydrogen tartrates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Tartaric acid is the racemic mixture of D-tartaric acid and L-tartaric acid. α-Ketoglutaric acid (alpha-ketoglutaric acid) or alternatively 2-oxoglutaric acid or 2-oxopentanedioic acid) is a dicarboxylic acid derived from n-pentane, which bears an additional carbonyl group at the α-C atom. Alpha-ketoglutaric acid has the CAS number 328-50-7. Alpha-ketoglutaric acid has a melting point of 112–116°C at 1013 mbar.Salts of alpha-ketoglutaric acid suitable for the invention are selected from the alpha-ketoglutarates and alpha-ketohydrogenglutarates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts. Beta-ketoglutaric acid can alternatively also be referred to as acetone-1,3-dicarboxylic acid or 3-oxopentanedioic acid. Beta-ketoglutaric acid has the CAS number 542-05-2. Beta-ketoglutaric acid has a melting point of 122 °C at 1013 mbar; it melts upon decomposition. Salts of beta-ketoglutaric acid suitable according to the invention are selected from the beta-ketoglutarates and beta-ketohydrogenglutarates of ammonium ions, alkali metal ions and alkaline earth metal ions, in particular of lithium, sodium, potassium, magnesium and calcium ions, as well as mixtures of these salts.

[0076] Citric acid is a tricarboxylic acid with the alternative names 2-hydroxypropane-1,2,3-tricarboxylic acid or 3-carboxy-3-hydroxyglutaric acid and with the CAS number 77-92-9 (anhydrous). Citric acid can also be supplied in the form of the monohydrate, which has the CAS number 5949-29-1. Citric acid in anhydrous form has a melting point of 153 °C at 1013 mbar; the monohydrate melts at 100 °C. Suitable citric acid salts according to the invention are selected from the citrates of ammonium ions, alkali metal ions, and alkaline earth metal ions, in particular lithium, sodium, potassium, magnesium, and calcium ions, as well as mixtures of these salts.

[0077] The di- and tricarboxylic acids described above are commercially available and can be purchased from various suppliers and manufacturers. One supplier of succinic acid, for example, is Artec Chemical.

[0078] To optimize bleaching performance, preparation (A) preferably contains the di- or tricarboxylic acid(s) in specific amounts. Particularly good results were obtained when preparation (A) contained one or more di- or tricarboxylic acids having 2 to 20 carbon atoms (a2) in a total amount of 0.1 to 5 wt.%, preferably 0.2 to 4 wt.%, more preferably 0.5 to 2 wt.%, and most preferably 0.8 to 1.2 wt.%, based on the total weight of preparation (A).

[0079] In a further very particularly preferred embodiment, a multi-component packaging unit according to the invention is characterized in that the preparation (A) - based on the total weight of the preparation (A) - contains one or more di- or tricarboxylic acids having 2 to 20 carbon atoms (a2) in a total amount of 0.1 to 5 wt.%, preferably 0.2 to 4 wt.%, more preferably from 0.5 to 2 wt.% and very particularly preferably from 0.8 to 1.2 wt.%.

[0080] Amino acids in the preparation (A)

[0081] As a third component essential to the invention, preparation (A) contains at least one amino acid (a3). The amino acids (a3) ​​are structurally different from the di- or tricarboxylic acids (a2).

[0082] An amino acid is a chemical compound with an amino group and a carboxylic acid group. The class of amino acids includes organic compounds that contain at least one amino group (-NH2 or substituted -NR2) and one carboxyl group (-COOH) as functional groups, thus exhibiting structural features of amines and carboxylic acids. Chemically, they can be differentiated according to the position of their amino group relative to the carboxyl group. If the amino group on the calcium atom is directly adjacent to the terminal carboxyl group, this is called the α-position and they are referred to as α-amino acids. Carboxylic acids with a total number of C atoms between C2 and C20, more preferably between C2 and C15, and particularly preferably between C2 and C10 are preferred.

[0083] Amino acids that have proven particularly suitable for solving the problem of the invention include arginine, lysine, serine, alanine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, methionine, phenylalanine, proline, threonine, tryptophan, tyrosine, valine, and their salts. These amino acids are commercially available and can be purchased from various manufacturers.

[0084] Well-suited salts of amino acids are, for example, their hydrochlorides or hydrobromides.

[0085] In a further very particularly preferred embodiment, a multi-component packaging unit according to the invention is characterized in that the preparation (A) contains at least one amino acid (a3) ​​from the group consisting of arginine, lysine, serine, alanine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, methionine, phenylalanine, proline, threonine, tryptophan, tyrosine, valine and salts thereof, preferably from the group consisting of arginine, lysine, serine and salts thereof.

[0086] Chiral amino acids possess a stereogenic center and can occur in mirror-image forms. For example, arginine occurs in the form of L-arginine and D-arginine. Both the L-form of an amino acid and its D-form, as well as mixtures thereof, are encompassed by the present invention. Within the scope of the present invention, both possible enantiomers can be used equally as a specific compound or as mixtures thereof, particularly as racemates. However, it is particularly advantageous to use the naturally occurring isomer form, usually in the L-configuration.

[0087] Particularly suitable amino acids (a3) ​​are selected from the group of arginine, lysine, serine and their salts.

[0088] The greatest improvement in bleaching performance without increasing hair damage was obtained when a preparation (A) containing a combination of arginine and lysine or containing a combination of arginine and serine was used to bleach the keratin fibers.

[0089] In a further very particularly preferred embodiment, a multi-component packaging unit according to the invention is characterized in that the preparation (A) contains the combination of (a3) ​​arginine and lysine or the combination of arginine and serine.

[0090] To optimize bleaching performance, preparation (A) preferably contains the amino acid(s) (a3) ​​in specific amount ranges. Particularly good results were obtained when preparation (A) contained one or more amino acids (a3) ​​in a total amount of 0.01 to 5.0 wt.%, preferably 0.1 to 3.5 wt.%, more preferably 0.15 to 3.0 wt.%, even more preferably 0.2 to 2.0 wt.%, and most preferably 0.25 to 0.6 wt.%, based on the total weight of preparation (A).

[0091] In a further particularly preferred embodiment, a multi-component packaging unit according to the invention is characterized in that the preparation (A) - based on the total weight of the preparation (A) - contains one or more amino acids (a3) ​​in a total amount of 0.01 to 5.0 wt.%, preferably 0.1 to 3.5 wt.%, more preferably 0.15 to 3.0 wt.%, even more preferably 0.2 to 2.0 wt.%, and most preferably 0.25 to 0.6 wt.%. Further components in the preparation (A)

[0092] With regard to the packaging, storage and stability of the preparation (A), it has been found to be particularly advantageous if the preparation (A) is solid, powdery or pasty at room temperature (20 °C).

[0093] If preparation (A) is to be solid or powdered, it may contain, in addition to the components (a1), (a2), and (a3), which are solid at room temperature (20 °C), other solid or powdered ingredients. In particular, the use of solid or powdered alkalizing agents and / or the use of a solid or powdered carrier is advantageous in this context.

[0094] Preferably, the preparation (A) therefore optionally additionally contains at least one compound from the group consisting of silicic acid, alkali metal silicates, alkaline earth metal silicates, alkali metal disilicates, alkaline earth metal disilicates, alkali metal carbonates and alkaline earth metal carbonates.

[0095] In a further very particularly preferred embodiment, a multi-component packaging unit according to the invention is characterized in that the preparation (A) is solid, powdery or pasty and contains at least one compound from the group consisting of silicon dioxides, alkali metal silicates, alkaline earth metal silicates, alkali metal disilicates, alkaline earth metal disilicates, alkali metal carbonates and alkaline earth metal carbonates.

[0096] A suitable silicon dioxide, for example, is the raw material Hydrophilie fumed silica HL 200, from Yichang Huifu Silison Miterial, with the CAS number 7631-86-9.

[0097] A particularly suitable alkali metal disilicate is, for example, sodium disilicate sold under the trade name Britesil C 265 by PQ Corporation, which has the CAS number 1344-09-8.

[0098] A very suitable basic alkaline earth metal carbonate is magnesium hydroxide carbonate with the CAS number 12125-28-9, which can be purchased under the trade name Luvomag C 013 from LuV Lehmann & Voss.

[0099] Another very suitable alkaline earth metal carbonate is magnesium carbonate.

[0100] The amounts of solid alkalizing agents or carriers used can be adjusted to the desired alkalinity or desired feel of preparation (A). It can be advantageous if preparation (A) contains - based on the total weight of preparation (A) - one or more compounds from the group consisting of silicon dioxides, alkali metal silicates, alkaline earth metal silicates, alkali metal disilicates, alkaline earth metal disilicates, alkali metal carbonates, and alkaline earth metal carbonates in a total amount of 10 to 80 wt.%, preferably 20 to 70 wt.%, and particularly preferably 30 to 60 wt.%. If preparation (A) is to be provided in the form of a paste, it can additionally contain at least one cosmetic oil. Preferred bleaching pastes according to the invention are characterized in that the cosmetic oil is selected from natural and synthetic hydrocarbons, particularly preferably from paraffin oils, C10-C30 isoparaffins,in particular isoeicosane, polyisobutenes and polydecenes, as well as 1,3-di-(2-ethylhexyl)-cyclohexane; benzoic acid esters of linear or branched Cs-22 alkanols; fatty alcohols with 6-30 carbon atoms, which are unsaturated or branched and saturated or branched and unsaturated; triglycerides of linear or branched, saturated or unsaturated, optionally hydroxylated Cs-30 fatty acids, in particular natural oils; dicarboxylic acid esters of linear or branched C2-C10 alkanols; esters of linear or branched saturated or unsaturated fatty alcohols with 2-30 carbon atoms with linear or branched saturated or unsaturated fatty acids with 2-30 carbon atoms,which may be hydroxylated; the addition products of 1 to 5 propylene oxide units with mono- or polyhydric Cs-22 alkanols; the addition products of at least 6 ethylene oxide and / or propylene oxide units with mono- or polyhydric C3-22 alkanols; the Cs-C22 fatty alcohol esters of monohydric or polyhydric C2-C7 hydroxycarboxylic acids; the symmetrical, asymmetrical or cyclic esters of carbonic acid with C3-22 alkanols, C3-22 alkanediols or C3-22 alkanetriols; the esters of dimers of unsaturated C12-C22 fatty acids (dimer fatty acids) with monohydric linear, branched or cyclic C2-C15 alkanols or with polyhydric linear or branched C2-C5 alkanols; Silicone oils and mixtures of the aforementioned substances.

[0101] The oil(s) are preferably present in preparation (a) in a total amount of 16-60% by weight, particularly preferably 20-50% by weight, extraordinarily preferably 25-45% by weight, in each case based on the total weight of preparation (A).

[0102] The preparation (A) can also contain further active ingredients, auxiliaries and additives, such as, for example, fatty components such as, for example, Cs-Cs0-fatty alcohols, Cs-Cs0-fatty acid triglycerides, Cs-Cs0-fatty acid monoglycerides, Cs-Cs0-fatty acid diglycerides and / or hydrocarbons; non-ionic surfactants, anionic surfactants, cationic surfactants, amphoteric and / or zwitterionic surfactants, polymers; thickeners, structurants such as glucose, maleic acid and lactic acid, hair conditioning compounds such as phospholipids, for example lecithin and cephalins; perfume oils, dimethyl isosorbide and cyclodextrins; fiber structure-improving active ingredients, in particular mono-, di- and oligosaccharides such as, for example, glucose, galactose, fructose, fructose and lactose; dyes for coloring the agent; Anti-dandruff agents such as piroctone olamine, zinc omadine, and climbazole; amino acids and oligopeptides;Animal and / or plant-based protein hydrolysates, as well as in the form of their fatty acid condensation products or, where appropriate, anionically or cationically modified derivatives; vegetable oils; sunscreens and UV blockers; active ingredients such as panthenol, pantothenic acid, pantolactone, allantoin, pyrrolidinonecarboxylic acids and their salts, and bisabolol; polyphenols, in particular hydroxycinnamic acids, 6,7-dihydroxycoumarins, hydroxybenzoic acids, plant extracts; fats and waxes such as fatty alcohols, beeswax, montan wax, and paraffins; swelling and penetrating agents such as glycerol, propylene glycol monoethyl ether, carbonates, hydrogen carbonates, guanidines, ureas, and primary, secondary, and tertiary phosphates; opacifiers such as latex, styrene / PVP, and styrene / acrylamide copolymers; Pearlescent agents such as ethylene glycol mono- and distearate and PEG-3 distearate; as well as propellants such as propane-butane mixtures, N2O, dimethyl ether, CO2 and air.

[0103] The skilled person will select these additional substances based on the desired properties of the agent. Regarding further optional components and the amounts of these components used, reference is expressly made to the relevant manuals known to the skilled person. The additional active ingredients and excipients are preferably used in the preparations according to the invention in amounts of 0.0001 to 25 wt.%, in particular 0.0005 to 15 wt.%, based on the total weight of preparation (A).

[0104] Preparation (B)

[0105] In addition to the first preparation (A), the multi-component packaging unit according to the invention comprises the second preparation (B), which is characterized in that it contains carbamide peroxide (b1).

[0106] Carbamide peroxide is the adduct of hydrogen peroxide and urea, which is commercially available, for example, in the form of a white crystalline powder. It is a water-soluble crystalline adduct that can be formed by recrystallizing urea with a 30% hydrogen peroxide solution.

[0107] Carbamide peroxide is also referred to in the literature as urea hydrogen peroxide adduct, urea peroxide, perhydrite, percarbamide, or urea peroxide. Carbamide peroxide has the molecular formula CH6N2O3 and the CAS number 124-43-6.

[0108] Carbamide peroxide can be purchased commercially from Thermo Scientific, for example.

[0109] Carbamide peroxide is the main component of preparation (B) and, upon mixing preparation (B) with water, releases the hydrogen peroxide required for the oxidation of the keratin fibers. Accordingly, it has proven preferable to use carbamide peroxide in correspondingly high amounts in preparation (B). It is particularly preferred if preparation (B) contains—based on the total weight of preparation (B)—10 to 100 wt.%, preferably 30 to 100 wt.%, more preferably 50 to 100 wt.%, and most preferably 70 to 100 wt.% of carbamide peroxide (b1).

[0110] With regard to the packaging, storage and stability of the preparation (B), it has been found to be particularly advantageous if the preparation (B) is solid, powdery or pasty at room temperature (20 °C).

[0111] In a further particularly preferred embodiment, a multi-component packaging unit according to the invention is characterized in that the preparation (B) is solid, powdery or pasty and - based on the total weight of the preparation (B) - contains 10 to 100 wt.%, preferably 30 to 100 wt.%, more preferably 50 to 100 wt.% and very particularly preferably 70 to 100 wt.% of carbamide peroxide (b1).

[0112] Most preferably, preparation (B) is solid or powdery at 20 °C.

[0113] However, preparation (B) can in principle also be provided in the form of a paste.

[0114] If preparation (B) is to be provided in the form of a paste, it can additionally contain at least one cosmetic oil. Preferred bleaching pastes according to the invention are characterized in that the cosmetic oil is selected from natural and synthetic hydrocarbons, particularly preferably from paraffin oils, C10-C30 isoparaffins, in particular isoeicosane, polyisobutenes and polydecenes, and also 1,3-di-(2-ethylhexyl)cyclohexane; the benzoic acid esters of linear or branched C5-22 alkanols; fatty alcohols having 6-30 carbon atoms, which are unsaturated or branched and saturated or branched and unsaturated; triglycerides of linear or branched, saturated or unsaturated, optionally hydroxylated C5-30 fatty acids, in particular natural oils; the dicarboxylic acid esters of linear or branched C2-C10 alkanols;the esters of linear or branched saturated or unsaturated fatty alcohols having 2-30 carbon atoms with linear or branched saturated or unsaturated fatty acids having 2-30 carbon atoms, which may be hydroxylated; the addition products of 1 to 5 propylene oxide units with mono- or polyhydric Cs-22 alkanols; the addition products of at least 6 ethylene oxide and / or propylene oxide units with mono- or polyhydric C3-22 alkanols; the Cs-C22 fatty alcohol esters of monohydric or polyhydric C2-C7 hydroxycarboxylic acids; the symmetrical, asymmetrical or cyclic esters of carbonic acid with C3-22 alkanols, C3-22 alkanediols or C3-22 alkanetriols; esters of dimers of unsaturated C12-C22 fatty acids (dimer fatty acids) with monohydric linear, branched, or cyclic C2-C15 alkanols or with polyhydric linear or branched C2-C5 alkanols; silicone oils, and mixtures of the aforementioned substances.

[0115] The oil(s) are preferably present in the preparation (B) in a total amount of 16-60% by weight, particularly preferably 20-50% by weight, extraordinarily preferably 25-45% by weight, in each case based on the total weight of the preparation (B).

[0116] Preparation (B) may also contain further active ingredients, auxiliaries and additives, such as, for example, fatty components such as, for example, Cs-Cs0-fatty alcohols, Cs-Cs0-fatty acid triglycerides, Cs-Cs0-fatty acid monoglycerides, Cs-Cs0-fatty acid diglycerides and / or hydrocarbons; non-ionic surfactants, anionic surfactants, cationic surfactants, amphoteric and / or zwitterionic surfactants, polymers; thickeners, structurants such as glucose, maleic acid and lactic acid, hair conditioning compounds such as phospholipids, for example lecithin and cephalins; perfume oils, dimethyl isosorbide and cyclodextrins; fiber structure-improving active ingredients, in particular mono-, di- and oligosaccharides such as, for example, glucose, galactose, fructose, fructose and lactose; dyes for coloring the agent; Anti-dandruff agents such as piroctone olamine, zinc omadine, and climbazole; amino acids and oligopeptides;Animal and / or plant-based protein hydrolysates, as well as in the form of their fatty acid condensation products or, where appropriate, anionically or cationically modified derivatives; vegetable oils; sunscreens and UV blockers; active ingredients such as panthenol, pantothenic acid, pantolactone, allantoin, pyrrolidinonecarboxylic acids and their salts, and bisabolol; polyphenols, in particular hydroxycinnamic acids, 6,7-dihydroxycoumarins, hydroxybenzoic acids, plant extracts; fats and waxes such as fatty alcohols, beeswax, montan wax, and paraffins; swelling and penetrating agents such as glycerol, propylene glycol monoethyl ether, carbonates, hydrogen carbonates, guanidines, ureas, and primary, secondary, and tertiary phosphates; opacifiers such as latex, styrene / PVP, and styrene / acrylamide copolymers; Pearlescent agents such as ethylene glycol mono- and distearate and PEG-3 distearate; as well as propellants such as propane-butane mixtures, N2O, dimethyl ether, CO2 and air.

[0117] The expert will select these additional substances based on the desired properties of the agent. Regarding further optional components and the amounts of these components used, reference is expressly made to the relevant manuals known to the expert. The additional active ingredients and excipients are preferably used in the preparations according to the invention in amounts of 0.0001 to 25 wt.%, in particular 0.0005 to 15 wt.%, based on the total weight of preparation (B).

[0118] Ready-to-use agent from (A) and (B)

[0119] To bleach the keratin fibers, a ready-to-use bleaching agent is created by mixing preparations (A) and (B) with water. Preparations (A) and (B) can be mixed with water in different orders. For example, preparations (A) and (B) can be mixed together first, after which a defined amount of water or tap water is added to this mixture of (A) and (B).

[0120] Preparation (A) can also be mixed with water first, and the mixture of (A) and water is then mixed with preparation (B). Or, preparation (B) can be mixed with water first, and then the mixture of (B) and water is mixed with preparation (A).

[0121] A further subject matter of the present application is therefore a ready-to-use agent for lightening keratin fibers, which is produced by mixing preparation (A) with preparation (B) and water, wherein preparations (A) and (B) have already been disclosed in detail in the description of the first subject matter of the invention.

[0122] Process for lightening keratin fibers

[0123] The multi-component packaging unit according to the invention or the mixture of preparations (A) and (B) are used in processes for lightening keratin fibers, in particular human hair.

[0124] A further subject matter of the present application is therefore a method for lightening keratinous fibers, in which preparation (A) is mixed with preparation (B) and water in any desired order and then the application mixture thus prepared is applied to the keratinous fibers, allowed to act and rinsed out with water after a period of 5 to 60 minutes, wherein preparations (A) and (B) have already been disclosed in detail in the description of the first subject matter of the invention.

[0125] Here too, the preparations (A) and (B) can be mixed with water in different orders.

[0126] For example, preparations (A) and (B) can first be mixed together, after which a defined amount of water or tap water is added to this mixture of (A) and (B).

[0127] It is also possible to first mix preparation (A) with water, and then mix the mixture of (A) and water with preparation (B).

[0128] Alternatively, preparation (B) is first mixed with water, and then the mixture of (B) and water is mixed with preparation (A). Within 5 to 15 minutes of mixing preparations (A) and (B) with water, the resulting ready-to-use bleaching agent is then applied to the keratin fibers. The contact time is 5 to 60 minutes. After the contact time, the bleaching agent is rinsed out of the keratin fibers with water or water and shampoo.

[0129] In a further very particularly preferred embodiment, a process according to the invention is characterized in that the preparation (A) is first mixed with the preparation (B) and this mixture of (A) and (B) is then mixed with water.

[0130] It has been found that with this application method, ie with the premixture of (A) and (B) and the subsequent mixing of this mixture of (A) and (B) with water, the very best whitening effects could be obtained.

[0131] In a further preferred embodiment, a process according to the invention is characterized in that the preparation (B) is first mixed with water and this mixture of (B) and water is then mixed with the preparation (A).

[0132] The bleaching effect was somewhat lower when the carbamide peroxide in the form of preparation (B) was first mixed with water and this premixture of (B) and water was then mixed with preparation (A).

[0133] The proportions in which preparations (A) and (B) are mixed with water can vary depending on the desired degree of lightening. Very good results were obtained when 100 parts by weight of preparation (A) were mixed with 10 to 80, preferably 20 to 70, particularly preferably 30 to 60 parts by weight of preparation (B) and 50 to 300, preferably 100 to 250, and particularly preferably 130 to 180 parts by weight of water.

[0134] In a further particularly preferred embodiment, a process according to the invention is characterized by mixing 100 parts by weight of preparation (A) with 10 to 80, preferably 20 to 70, particularly preferably 30 to 60 parts by weight of preparation (B) and 50 to 300, preferably 100 to 250 and particularly preferably 130 to 180 parts by weight of water.

[0135] Regarding the further preferred embodiments of the ready-to-use agent and method according to the invention, what has been said regarding the multi-component packaging unit according to the invention applies mutatis mutantis. Examples

[0136] 1. Preparations (A) and (B)

[0137] The following preparations were prepared (all data in wt.% unless otherwise stated)

[0138] (AV) is a preparation (A) of the comparison, which contains peroxodisulfates (a1), but no diacid (a2) and no amino acid (a3).

[0139] (AE) is the preparation (A) according to the invention containing peroxodisulfates (a1) and diacid (a2) and amino acid (a3). 2. Preparation of the ready-to-use bleaching agent and application

[0140] The following ready-to-use bleaching agents (AWM) were produced:

[0141] To prepare the application mixtures 1 and 2 (AWM 1 and AWM 2), the above-mentioned amounts of preparation (A) and (B) were mixed together in a dry state, then the stated amount of water was added and the mixture was mixed well for 3 minutes.

[0142] To prepare application mixtures 3 and 4 (AWM 3 and AWM 4), the specified amount of preparation (B) was first mixed with water and stirred thoroughly for 3 minutes. Then, the mixture prepared from (B) and water was mixed with the respective preparation (A), and this mixture was stirred thoroughly again for 3 minutes.

[0143] Hair strands (Kerling, Euronaturhaar 4-0) were colorimetrically measured. The previously prepared application mixture was then applied to each strand of hair, left to work for 30 minutes at 30°C, and rinsed with water. The strands were then dried and colorimetrically measured again.

[0144] The color difference (AE value) of the strands before and after bleaching was calculated from the Lab measurements. The higher the AE value, the greater the color shift of the strand compared to untreated hair and the stronger the bleaching effect.

[0145] The AWM 2 application mix showed improved lightening performance compared to the AWM 1 application mix. The AWM 4 application mix also showed improved lightening performance compared to the AWM 3 application mix.

[0146] The best whitening was achieved when the inventive preparation (AE) was first mixed with the percarbamide (BE) and then this mixture of (AE) and (BE) was mixed with water. This mixing process resulted in AWM 2.

[0147] 3. Measurement of hair damage

[0148] The hair lightened with the application mixtures AWM1 and AWM2 was examined for hair damage. For this purpose, the amount of cysteic acid present in the hair strand was determined using quantitative NIR spectroscopy.

[0149] The spectra were recorded with an MPA™ FT -NIR spectrometer from Bruker Optik GmbH. The infrared range covers the wavenumber range of 12500 cm -1 up to 4000 cm -1 and is characteristic of overtone and combination vibrations of, for example, CH, OH and NH groups.

[0150] The measurements were carried out using the integrating sphere module at six different sample positions in diffuse reflection. For the analysis of the measured NIR spectra, the wavenumber range of 7300 cm -1 up to 4020 cnr 1 chosen.

[0151] The NIR spectra of cystine show in the wavenumber range of 6200 cm -1 up to 5500 cm -1characteristic absorption bands. If the hair changes due to more severe damage (ie the cysteic acid content in the hair increases), this affects the bands characteristic of cysteic acid at 5020 cnr in the NIR spectrum. 1 up to 4020 cnr 1 The quantitative analysis of the NIR spectra was carried out using computer-aided methods.

[0152] The NIR analysis value provides the amount of mol of cysteic acid per 100 mol of amino acid. The higher this cysteic acid value, the more severe the hair damage:

[0153] By bleaching with the preparations (AE) and (BE) according to the invention (=AWM 2), the bleaching performance could be improved compared to AWM 1 without causing greater hair damage.

Claims

Patent claims 1. Multi-component packaging unit (kit-of-parts) for lightening keratin fibers, comprising at least two separately packaged preparations (A) and (B), wherein - the preparation (A) contains (a1) at least one peroxodisulfate, and (a2) at least one di- or tricarboxylic acid having 2 to 20 carbon atoms and / or a salt of this acid, and (a3) at least one amino acid, and - the preparation (B) contains (b1) Carbamide peroxide.

2. Multi-component packaging unit according to claim 1, characterized in that the preparation (A) contains at least one peroxodisulfate (a1) from the group consisting of ammonium peroxodisulfate, potassium peroxodisulfate and / or sodium peroxodisulfate.

3. Multi-component packaging unit according to one of claims 1 to 2, characterized in that the preparation (A) - based on the total weight of the preparation (A) - contains one or more peroxodisulfates (a1), in particular ammonium peroxodisulfate and potassium peroxodisulfate, in a total amount of 10.0 to 80.0 wt.%, preferably 20.0 to 70.0 wt.%, more preferably from 25.0 to 60.0 wt.%, even more preferably from 30.0 to 55.0 wt.% and very particularly preferably from 35.0 to 50.0 wt.%.

4. Multi-component packaging unit according to one of claims 1 to 3, characterized in that the preparation (A) contains at least one di- or tricarboxylic acid having 2 to 20 carbon atoms (a2) which is selected from the group consisting of succinic acid, maleic acid, fumaric acid, malic acid, oxalic acid, malonic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, D-tartaric acid, L-tartaric acid, meso-tartaric acid, grape acid, alpha-ketoglutaric acid, beta-ketoglutaric acid, citric acid and salts thereof, preferably selected from succinic acid, malic acid, maleic acid, fumaric acid and salts thereof, particularly preferably selected from succinic acid and salts thereof.

5. Multi-component packaging unit according to one of claims 1 to 4, characterized in that the preparation (A) - based on the total weight of the preparation (A) - contains one or more di- or tricarboxylic acids having 2 to 20 carbon atoms (a2) in a total amount of 0.1 to 5 wt.%, preferably 0.2 to 4 wt.%, more preferably from 0.5 to 2 wt.% and very particularly preferably from 0.8 to 1.2 wt.%. Multi-component packaging unit according to one of claims 1 to 5, characterized in that the preparation (A) contains at least one amino acid (a3) ​​from the group consisting of arginine, lysine, serine, alanine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, methionine, phenylalanine, proline, threonine, tryptophan, tyrosine, valine, and their salts, preferably from the group consisting of arginine, lysine, serine, and their salts. Multi-component packaging unit according to one of claims 1 to 6, characterized in that the preparation (A) contains the combination of (a3) ​​arginine and lysine or the combination of arginine and serine. Multi-component packaging unit according to one of claims 1 to 7, characterized in that the preparation (A) - based on the total weight of the preparation (A) - one or more amino acids (a3) ​​in a total amount of 0.01 to 5.0 wt.%, preferably 0.1 to 3.5 wt.-%, more preferably from 0.15 to 3.0 wt.%, even more preferably from 0.2 to 2.0 wt.%, and most preferably from 0.25 to 0.6 wt.%. Multi-component packaging unit (kit of parts) according to one of claims 1 to 8, characterized in that the preparation (A) is solid, powdery, or pasty at 20°C and contains at least one compound from the group consisting of silicon dioxides, alkali metal silicates, alkaline earth metal silicates, alkali metal disilicates, alkaline earth metal disilicates, alkali metal carbonates, and alkaline earth metal carbonates. Multi-component packaging unit according to one of claims 1 to 9, characterized in that the preparation (B) is solid, powdery or pasty and - based on the total weight of the preparation (B) - contains 10 to 100 wt.%, preferably 30 to 100 wt.%, more preferably 50 to 100 wt.% and very particularly preferably 70 to 100 wt.% of carbamide peroxide (b1).A ready-to-use agent for lightening keratin fibers, which is prepared by mixing preparation (A) with preparation (B) and water, wherein preparations (A) and (B) are defined in any one of claims 1 to 10. A method for lightening keratin fibers, in which preparation (A) is mixed with preparation (B) and water in any desired order, and then the application mixture thus prepared is applied to the keratin fibers, allowed to act, and... after a period of 5 to 60 minutes, the preparations (A) and (B) are defined in any one of claims 1 to 10. Process according to claim 12, characterized in that the preparation (A) is first mixed with the preparation (B) and this mixture of (A) and (B) is then mixed with water. Process according to claim 12, characterized in that the preparation (B) is first mixed with water and this mixture of (B) and water is then mixed with the preparation (A). Process according to any one of claims 12 to 14, characterized by mixing 100 parts by weight of the preparation (A) with 10 to 80, preferably 20 to 70, particularly preferably 30 to 60 parts by weight of the preparation (B) and 50 to 300, preferably 100 to 250 and particularly preferably 130 to 180 parts by weight of water.

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