Powder hair dye composition

Abstract

To solve the problems peculiar to a powdery hair dye, such as operability of a powdery hair dye composition, solubility upon mixing with a liquid medium, and securing of proper viscosity after mixing with the liquid medium.SOLUTION: A powdery hair dye composition includes (A) percarbonate and (B) oxidation dye, and further includes (C) guar gum and (D) sucrose fatty acid ester, with the mass ratio of the content of the (D) sucrose fatty acid ester to the (C) guar gum content, (D) / (C), of 0.01-0.6.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a powder hair dye composition containing a percarbonate and an oxidation dye, and more particularly to a powder hair dye composition having a new component composition that solves problems specific to powder hair dyes. [Background technology]

[0002] Hair dye compositions dye hair by oxidizing and polymerizing an oxidation dye in the hair to develop color. Many hair dye compositions consist of a liquid first agent containing an oxidation dye and an alkaline agent, and a liquid second agent containing an oxidizing agent, but powder hair dyes are also available. Powder hair dyes contain the oxidation dye, alkaline agent, oxidizing agent, etc., formulated as powders (solids), making them a single-component system that is mixed with a liquid medium such as water and then applied to hair for dyeing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-273759 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-260837

[0004] The above-mentioned Patent Document 1 discloses that starch is blended into a powder hair dye to maintain the stability of a solid oxidizing agent (such as sodium percarbonate) before and after storage. The above-mentioned Patent Document 2 discloses that blending percarbonate with a specific dye intermediate such as 5-aminoorthocresol sulfate, an oxidation dye, results in excellent hair dyeing power and the ability to dye hair in vivid warm colors. Summary of the Invention [Problem to be solved by the invention]

[0005] Powder hair dye compositions have advantages over liquid two-component hair dyes, such as ease of preparation, being lightweight and a single-component composition, which simplifies packaging and reduces transportation and storage costs, and being convenient for users to use. However, due to the powder form, there are also unique challenges, such as ensuring the flowability of the powder raw material during manufacturing and ensuring the solubility of the powder raw material in a liquid medium, which is a prerequisite for viscosity adjustment during use. These challenges unique to powder hair dyes often affect the hair dyeing effect, which is the original value of using a hair dye.

[0006] According to the research of the present inventors, some general-purpose lubricants (dispersants) blended to ensure the fluidity of powder raw materials exhibit excellent powder dispersion effects, but are also water-repellent, forming clumps when mixed with a liquid medium and impairing the solubility of the powder hair dye. Furthermore, some general-purpose thickeners blended to ensure the appropriate viscosity of the mixture with a liquid medium have a rapid thickening effect, which causes clumps to form when mixed with the liquid medium for reasons other than the water-repellent properties. In either case, the formation of clumps can result in insufficient dissolution of the powder hair dye, which can ultimately lead to reduced dyeing power and uneven dyeing during oxidation hair dyeing. In addition, conventional powder hair dye compositions contain many petroleum-derived ingredients, which is not necessarily desirable.

[0007] Therefore, the technical problem to be solved by the present invention is to address the issues specific to powder hair dyes, such as the fluidity of the powder raw material, solubility when mixed with a liquid medium, and ease of handling and even dyeing ability based on ensuring the appropriate viscosity after mixing with the liquid medium. [Means for solving the problem]

[0008] In the following, the content of a component expressed in mass % indicates the content in the powder hair dye composition. However, since the component can be mixed with a liquid medium such as water at any mass ratio during use, the content at the time of mixing, which is an important formulation parameter for (A) percarbonate, (B) oxidation dye, (C) guar gum, etc., cannot be calculated based on the content in the powder hair dye composition. Therefore, the content of each component in the powder hair dye composition is stated assuming that the powder hair dye composition is mixed with a liquid medium in an amount 10 times by mass during use. However, this statement is not intended to limit the mixing ratio between the powder hair dye composition and the liquid medium during use.

[0009] (Configuration of the first invention) The first invention of the present application, which aims to solve the above-mentioned problems, is a powdered hair dye composition containing (A) a percarbonate and (B) an oxidation dye, and further containing (C) guar gum and (D) a sucrose fatty acid ester, wherein the mass ratio (D) / (C) of the content of the (D) sucrose fatty acid ester to the content of the (C) guar gum is within the range of 0.01 to 0.6. In the first invention, (A) percarbonate is blended as an oxidizing agent, (C) guar gum is blended as a thickening agent, and (D) sucrose fatty acid ester is blended as a lubricant (dispersant).

[0010] (Configuration of the second invention) The second invention of the present application for solving the above problem is characterized in that, in the powder hair dye composition according to the first invention, the content of (C) guar gum is 5 to 20% by mass and the content of (D) sucrose fatty acid ester is 0.2 to 5% by mass.

[0011] (Configuration of the third invention) The third invention of the present application for solving the above problems is characterized in that the powder hair dye composition according to the first or second invention further contains one or more of the following (E) to (G): (E) L-Threonine (F) Lactose (G) Starch In the third invention, (E) L-threonine is blended as a chelating agent, (F) lactose is blended as an excipient, and (G) starch is blended as a stabilizer for powder components. [Effects of the Invention]

[0012] (Effects of the first invention) The first invention contains (C) guar gum as a thickener. Guar gum is nonionic and thickens more slowly than, for example, carboxymethyl cellulose, a commonly used anionic thickener. As a result, it has been found that lumps can be avoided when mixed with a liquid medium, thereby preventing poor hair dyeing, such as a lack of even dyeing. In terms of improving the operability and stability of powder hair dyes over time, which are the basic effects of adding guar gum as a thickener, it is comparable to carboxymethyl cellulose. Next, the first invention contains (D) a sucrose fatty acid ester as a lubricant. For example, magnesium stearate, which has good dispersing properties, is commonly used as a lubricant for powder hair dyes. However, it has been found that this is water-repellent and can cause clumping by reducing the solubility of the powder hair dye in the liquid medium. However, sucrose fatty acid esters have good water solubility, allowing the powder hair dye to maintain its excellent solubility while also exhibiting dispersing properties comparable to those of magnesium stearate. This allows the hair dye to be easily applied to hair, resulting in excellent hair dyeing properties based on uniform dyeing, etc.

[0013] Furthermore, the mass ratio (D) / (C) of the content of (D) sucrose fatty acid ester to (C) guar gum in the powder hair dye composition is one of the major features of the present invention. That is, with conventional two-component liquid hair dyes, while ensuring hair dyeing power is a prerequisite, consideration is given to operability, such as preventing dripping from the hair during dyeing and good application to the hair. However, with powder hair dyes, in addition to ensuring hair dyeing power and operability, consideration must also be given to the flowability of the powder raw materials during production and the solubility of the powder raw materials in the liquid medium during use. Furthermore, there is a trade-off between improving the flowability of the powder raw materials and worsening their solubility in the liquid medium, and improving their solubility in the liquid medium and worsening their flowability.

[0014] The present inventors have discovered that the solution to this problem lies in adjusting the mass ratio (D) / (C) of the content of (D) sucrose fatty acid ester to (C) guar gum. When this mass ratio is within the range specified in the first invention, the powder hair dye composition has good fluidity during production and good solubility in a liquid medium during use. If this mass ratio is below the lower limit of the range specified in the first invention, the powder hair dye composition lacks fluidity, and if this mass ratio exceeds the upper limit of the range specified in the first invention, the powder hair dye composition lacks solubility in a liquid medium. Naturally, if the content of the thickener component (C) is too small or too large, the viscosity of the mixture of the powder hair dye composition and the liquid medium will be insufficient or excessive, which will impair the operability during hair dyeing, rather than being a problem of the mass ratio (D) / (C).Furthermore, if the content of the lubricant component (D) is too small or too large, the fluidity of the powder hair dye composition will be impaired, or the solubility will be impaired due to an excess of lubricant, rather than being a problem of the mass ratio (D) / (C). All of the above-mentioned various problems ultimately lead to dissatisfaction with the dyeing effect of the hair dye.

[0015] (Effects of the second invention) The content of (C) guar gum in the powder hair dye composition is not particularly limited, but is preferably 5 to 20% by mass, more preferably 7 to 18% by mass, and particularly preferably 10 to 15% by mass. The content of (D) sucrose fatty acid ester in the powder hair dye composition is not particularly limited, but is preferably 0.2 to 5 mass %, more preferably 0.6 to 4 mass %, and particularly preferably 0.7 to 3 mass %.

[0016] (Effects of the third invention) The powder hair dye composition preferably further contains one or more of (E) L-threonine, (F) lactose, and (G) starch.

[0017] (E) L-threonine has a particularly excellent copper ion chelating effect, and its incorporation improves the texture of hair dye powders. Furthermore, while many commonly used chelating agents are petroleum-derived, this is also advantageous because it is an organic chelating agent. (F) Lactose is used in place of sodium sulfate, which is generally used as an excipient in powder hair dyes. Lactose has the effect of preventing the powder hair dye composition from absorbing moisture, and can suppress a decrease in fluidity due to moisture absorption and a decrease in the storage stability of oxidation dyes. Lactose is also preferable because it is an organic compound, unlike sodium sulfate, which is derived from minerals. The powder hair dye contains (G) starch, which stabilizes the oxidizing agent, thereby suppressing changes in the color tone of the dyed hair before and after storage of the powder hair dye. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, embodiments of the present invention will be described, including the best mode thereof, but the technical scope of the present invention is not limited to these embodiments. [Powder hair dye composition] The powder hair dye composition of the present invention contains (A) a percarbonate, (B) an oxidation dye, (C) guar gum, and (D) a sucrose fatty acid ester, and the mass ratio (D) / (C) of the content of (D) sucrose fatty acid ester to (C) guar gum is within the range of 0.01 to 0.6. This mass ratio (D) / (C) is more preferably within the range of 0.04 to 0.5, and even more preferably within the range of 0.05 to 0.4. The powder hair dye composition preferably further contains one or more of (E) L-threonine, (F) lactose, and (G) starch. As described below, the powder hair dye composition also contains other components necessary or beneficial for an oxidation hair dye, as well as various optional components.

[0019] Powder hair dye compositions are usually one-component compositions, but may also be multi-component compositions (two or more components). When used, the powder hair dye composition is mixed with a liquid medium such as water to form a hair dye application liquid, which is then applied to hair. The mixing ratio of the powder hair dye composition to the liquid medium when used is not limited, and can be, for example, a 1:10 mass ratio, but is not limited thereto and can be any other mass ratio, such as 1:5.

[0020] [Essential components of powder hair dye composition] <(A) Percarbonate> Percarbonates are oxidizing agents that have the effect of oxidizing oxidation dyes to develop color and decomposing melanin inside hair. Specific examples include sodium percarbonate and potassium percarbonate, with sodium percarbonate being preferred.

[0021] The content of percarbonate in the powder hair dye composition is not particularly limited, but is preferably 15 to 60% by mass, more preferably 20 to 50% by mass, and particularly preferably 25 to 40% by mass. When the content of percarbonate is 15% by mass or more, the effect of the present invention of suppressing changes in dyed hair color tone during long-term storage is more effectively exhibited, and the fluidity of the powder hair dye composition is also improved. On the other hand, when the content of percarbonate is 60% by mass or less, the effect of reducing damage to hair is exhibited.

[0022] The powder hair dye composition of the present invention may contain any oxidizing agent in addition to the percarbonate (A) described above, such as various peroxide salts, hydrogen peroxide adducts of various sulfates, hydrogen peroxide adducts of various phosphates, hydrogen peroxide adducts of various pyrophosphates, urea peroxide, melamine peroxide, various perborates, various perbromates, and various permanganates.

[0023] <(B) Oxidation dye> Oxidation dyes are dyes that develop color through oxidative polymerization with (A) percarbonate. Oxidation dyes include dye intermediates and couplers. Dye intermediates are substances that polymerize and develop color through their own oxidation, and couplers are substances that can be combined with dye intermediates to produce various colors.

[0024] Dye intermediates are dye precursors, which are mainly o- or p-phenylenediamines or aminophenols, and are usually colorless or weakly colored compounds themselves.

[0025] Specific examples include p-aminophenol, o-aminophenol, p-methylaminophenol, p-phenylenediamine, toluene-2,5-diamine, N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, 2,2'-[(4-aminophenyl)imino]bisethanol, and salts thereof such as sulfates and hydrochlorides. One or more dye intermediates can be selected and used depending on the desired hair color tone. The total content of the dye intermediates is not particularly limited, but is, for example, 1 to 30% by mass, more preferably 5 to 20% by mass, in the powder hair dye composition.

[0026] Examples of couplers include mainly m-diamines, aminophenols, and diphenols, and specific examples include m-metaaminophenol, 5-aminoorthocresol, resorcinol, catechol, pyrogallol, phloroglucinol, gallic acid, hydroquinone, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4-diamine, α-naphthol, 2,6-diaminopyridine, diphenylamine, 3,3′-iminodiphenyl, 1,5-dihydroxynaphthalene, tannic acid, 1-hydroxyethyl-4,5-diaminopyrazole, and salts thereof such as sulfates and hydrochlorides.

[0027] One or more couplers can be selected and used depending on the desired hair color tone. The total content of couplers in the powder hair dye composition is not particularly limited, but is, for example, 0.1 to 20% by mass, more preferably 0.5 to 15% by mass, and particularly preferably 1 to 10% by mass.

[0028] <(C) Guar Gum> Guar gum is a type of water-soluble polymer compound, and is used as a thickener in the present invention. Guar gum is nonionic, and has the advantage that its thickening effect appears more slowly when dissolved in water than ionic polymer compounds such as CMC (carboxymethyl cellulose). Furthermore, the thickening effect of guar gum is excellent in viscosity stability after storage. The preferred content of (C) guar gum in the powder hair dye composition is as explained in the second invention.

[0029] <(D) Sucrose fatty acid ester> Sucrose fatty acid esters, also known as sugar esters, are a type of ester-based nonionic surfactant, and are used as lubricants (dispersants) in the present invention. Sucrose stearate is particularly preferred. As described above in the "Effects of the First Invention" section, (D) sucrose fatty acid ester, in relation to (C) guar gum, is closely related to the fluidity of the powder composition and its solubility in a liquid medium, issues not encountered in liquid two-component hair dyes. Specifically, together with guar gum, it is a component that is directly related to the mass ratio (D) / (C) of the first invention, ensuring the fluidity of the powder composition while not inhibiting its solubility in a liquid medium. The preferred content of (D) sucrose fatty acid ester in the powder hair dye composition is as explained in relation to the second invention, and the preferred range of the content mass ratio (D) / (C) is as explained in relation to the first invention.

[0030] [Key components of powder hair dye compositions] <(E)L-Threonine> L-threonine is a so-called essential amino acid with a hydroxyl group in the molecule, and is used in the present invention as a chelating agent. As a chelating agent, L-threonine is suitable for capturing copper ions and is therefore suitable for use in areas with so-called hard water. The preferred content of L-threonine in the powder hair dye composition is not particularly limited, but is, for example, 1 to 5 mass %, more preferably 1.2 to 4.5 mass %, and particularly preferably 1.5 to 4 mass %.

[0031] <(F)Lactose> Lactose is a type of carbohydrate found in milk and the like, and is used as an excipient in the present invention. Among lactose types, lactose consisting of or containing anhydrous lactose is more preferred. The preferred lactose content in the powder hair dye composition is not particularly limited, but is, for example, 0.01 to 70% by mass, more preferably 5 to 60% by mass, and particularly preferably 10 to 50% by mass.

[0032] <(G) Starch> Starch is a natural polymeric compound extracted from various plants, and is used as a stabilizer in the present invention. There are many types of starch, but potato starch is particularly preferred. The incorporation of starch into the powder hair dye composition is expected to stabilize the dyed hair color tone before and after storage of the powder hair dye composition and improve the ease of application of the powder hair dye composition to hair after mixing with a liquid medium. The preferred range of the starch content in the powder hair dye composition is not particularly limited, but is, for example, 3 to 50% by mass, more preferably 7 to 40% by mass, and particularly preferably 10 to 30% by mass.

[0033] <Alkaline agent> Alkaline agents swell hair and promote the penetration of dyes and oxidizing agents. Examples of alkaline agents include silicates, carbonates, bicarbonates, metasilicates, phosphates, basic amino acids, hydroxides, etc. Specific examples of silicates include sodium silicate and potassium silicate, carbonates include sodium carbonate, ammonium carbonate, magnesium carbonate, guanidine carbonate, etc., bicarbonates include sodium bicarbonate and ammonium bicarbonate, metasilicates include sodium metasilicate and potassium metasilicate, phosphates include ammonium monophosphate, ammonium diphosphate, disodium monohydrogenphosphate, trisodium phosphate, etc., basic amino acids include arginine, lysine, and salts thereof, and hydroxides include calcium hydroxide and magnesium hydroxide. The content of the alkaline agent in the powder hair dye composition is not limited, but is preferably 5 to 50% by mass, more preferably 10 to 40% by mass, and particularly preferably 15 to 30% by mass.

[0034] <Chelating agents, excipients, and stabilizers other than (E) to (G)> The powder hair dye composition may contain (E) various chelating agents other than L-threonine, (F) various excipients other than lactose, and (G) various stabilizers other than starch, within ranges that do not substantially impair the effects of the present invention.

[0035] [Optional components of powder hair dye composition] Components that may be optionally contained in the powder hair dye composition are described below. The content of the optional components is determined appropriately within a range that does not substantially impair the effects of the present invention, and is not particularly limited.

[0036] <Water-soluble polymer compounds> The powder hair dye composition of the present invention may contain water-soluble polymeric compounds other than (C) guar gum and (G) starch, provided that the water-soluble polymeric compounds do not interfere with the effects and advantages of (C) guar gum described in the "Effects of the First Invention" section and (G) starch described in the "Effects of the Third Invention" section. Examples of these water-soluble polymeric compounds include seaweed extracts such as alginic acid, carrageenan, and agar. Other examples include seed mucilages such as konjac mannan, dextrin, and locust bean gum. Other examples include sap mucilages such as gum arabic, karaya gum, and tragacanth gum. Other examples include plant proteins such as wheat protein and soy protein. Other examples include animal proteins such as albumin, gelatin, and collagen. Other examples include microbial mucilages such as curdlan, xanthan gum, and dextran. Other examples include mucopolysaccharides such as chitosan and hyaluronic acid.

[0037] Examples of semi-synthetic water-soluble polymer compounds include methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, methylhydroxypropyl cellulose, cationized cellulose, and alginates (for example, sodium alginate).

[0038] Examples of synthetic water-soluble polymer compounds include polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, polyacrylamide, polyethylene oxide, acrylic acid / alkyl acrylate copolymer, and the like.

[0039] <Direct dye> Examples of direct dyes include acid dyes, basic dyes, natural dyes, nitro dyes, HC dyes, and disperse dyes. The direct dyes may be blended alone or in combination.

[0040] <Oily ingredients> Examples of oily components include higher alcohols, fats and oils, waxes, hydrocarbons, higher fatty acids, esters, silicone oils, fluorine oils, etc. One or more of these oily components can be selected and used.

[0041] Examples of higher alcohols include cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, oleyl alcohol, arachyl alcohol, behenyl alcohol, lauryl alcohol, and myristyl alcohol.

[0042] The fats and oils are triesters of fatty acids and glycerin, and examples thereof include olive oil, rosehip oil, camellia oil, shea butter, macadamia nut oil, almond oil, tea seed oil, camellia oil, safflower oil, and sunflower oil.

[0043] Examples of hydrocarbons include liquid paraffin, paraffin, microcrystalline wax, petrolatum, isoparaffins, α-olefin oligomers, synthetic squalane, squalene, hydrogenated squalane, limonene, and turpentine.

[0044] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, and hydroxystearic acid.

[0045] Examples of esters include diisopropyl adipate, 2-hexyldecyl adipate, myristyl myristate, cetyl octanoate, isononyl isononanoate, 2-ethylhexyl palmitate, and cetyl ethylhexanoate.

[0046] Examples of silicone oils include dimethylpolysiloxane (INCI name: dimethicone), dimethylpolysiloxane with hydroxyl end groups (INCI name: dimethiconol), methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, polyether-modified silicone, and the like.

[0047] <Surfactant> The surfactants include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants. In the following description, POE represents a polyoxyethylene chain, and POP represents a polyoxypropylene chain.

[0048] Examples of nonionic surfactants include POE alkyl ethers, POE alkyl phenyl ethers, POE·POP alkyl ethers, POE sorbitan fatty acid esters, POE monofatty acid esters, POE glycerin fatty acid esters, polyglycerin fatty acid esters, monoglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, and alkyl polyglucosides.

[0049] Examples of cationic surfactants include alkyl quaternary ammonium salts such as monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, benzalkonium quaternary ammonium salts, and monoalkyl ether quaternary ammonium salts, amine salts such as alkylamine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, and arcobel tertiary amine salts, cyclic quaternary ammonium salts such as alkylpyridinium salts and alkylisoquinolium salts, and benzethonium chloride. Preferred are alkyl quaternary ammonium salts, more preferred are monoalkyl quaternary ammonium salts and dialkyl quaternary ammonium salts, and particularly preferred are monoalkyl quaternary ammonium salts.

[0050] Examples of anionic surfactants include alkyl ether sulfates, POE alkyl ether sulfates, alkyl sulfates, alkenyl ether sulfates, alkenyl sulfates, olefin sulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfonic acid salts, N-acylamino acid surfactants, phosphoric acid mono- or diester surfactants, and sulfosuccinate esters. The counter ion of the anionic group of these surfactants may be any of sodium ion, potassium ion, and triethanolamine.

[0051] Examples of amphoteric surfactants include amino acid-type amphoteric surfactants and betaine-type amphoteric surfactants. Specific examples of amino acid-type amphoteric surfactants include N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium (sodium lauroamphoacetate). Specific examples of betaine-type amphoteric surfactants include coconut oil alkyl betaine, lauryl dimethyl aminoacetic acid betaine, myristyl dimethyl aminoacetic acid betaine, stearyl dimethyl aminoacetic acid betaine, sodium stearyl dimethyl betaine, and coconut oil fatty acid amidopropyl betaine.

[0052] <Inorganic salts> In addition to the above-mentioned (F) lactose, examples of the excipient include inorganic salts such as sodium sulfate. Although sodium sulfate is not a preferred component in the present invention, it may be contained in the powder hair dye composition within a range that does not impair the action and effect of (F) lactose described in the section "Effects of the Third Invention."

[0053] <Other optional ingredients> In addition to the above, the powder hair dye composition of the present invention may contain pH adjusters, (F) sugars other than lactose, hair growth ingredients, plant extracts, herbal extracts, amino acids, polypeptides, vitamins, fragrances, preservatives, ultraviolet absorbers, etc.

[0054] [Method of using the powder hair dye composition] The powder hair dye composition of the present invention is mixed with a liquid medium such as water to prepare a hair dye application liquid. This hair dye application liquid corresponds to a mixture of the first and second parts of a two-part liquid hair dye, and the process of applying this hair dye application liquid to hair is the same as that for a mixture of the first and second parts of a two-part liquid hair dye.

[0055] The liquid medium is preferably water or a water-based liquid medium such as tap water, purified water, deionized water, or distilled water. Water is more preferred. The mixing ratio by mass of the powder hair dye composition and the liquid medium is not limited, but a ratio of powder hair dye composition:liquid medium of 1:5 to 1:15 is preferred, and a ratio of 1:8 to 1:12 is particularly preferred.

[0056] The formulation of the hair dye application liquid is not particularly limited, and may be any of liquid, cream, gel, and paste. A cream or paste form is preferred from the viewpoint of ease of application with a brush, improved spreadability and adhesion to hair, and excellent application operability. The hair dye application liquid may also be in the form of a foam or mist. When foaming, the hair dye application liquid may be filled into a shaking container and foamed by shaking, or a known foaming device such as a non-aerosol foamer or an aerosol foamer may be used.

[0057] The hair dye solution may be applied to the hair using an applicator such as a comb, brush, paintbrush, etc. Alternatively, the hair dye solution may be applied to the hair using gloved hands.

[0058] The powder hair dye composition and the liquid medium can be mixed using various preparation tools, such as containers such as bottles, cups, and trays, and stirrers such as stirring rods. For example, the powder hair dye composition and the liquid medium can be sealed in a bottle in a predetermined ratio and the bottle can be shaken to easily and quickly mix the components. Furthermore, it is more preferable to use an applicator container equipped with a bottle and an applicator connected to the bottle that dispenses the hair dye application liquid in the bottle. Examples of applicator tools that can be equipped in the applicator container include comb-shaped, brush-shaped, and nozzle-shaped applicators. From the viewpoint of convenience, a comb-equipped container is preferred as the applicator, as it allows the hair dye application liquid to be applied to the hair while combing with the comb.

[0059] There is no particular limit to how long the dye should be left on the hair after application, but it can be left on for about 30 to 40 minutes. After that time, rinse off any remaining hair dye solution from the hair. Then, you can care for your hair as needed using shampoo, conditioner, treatment, etc. [Example]

[0060] Examples of the present invention will now be described together with corresponding comparative examples, but the technical scope of the present invention is not limited by these examples and comparative examples.

[0061] [Preparation of compositions according to examples and comparative examples] Powder hair dye compositions of Examples 1 to 5 and Comparative Examples 1 to 5 shown in Tables 1 and 2 at the end of this document were prepared according to standard methods. In the tables, the numerical values ​​shown in the component column for each Example and Comparative Example indicate the content of the component in mass % in the powder hair dye composition. Components (A) to (G) of the present invention are each marked with "(A)" to "(G)" to the left of the component name column.

[0062] [Evaluation of Compositions in Examples and Comparative Examples] Next, the powder hair dye compositions according to the Examples and Comparative Examples were first evaluated for fluidity, and then for solubility, operability, and dye leveling, using the following evaluation methods and based on the following evaluation criteria.

[0063] (Liquidity assessment) Evaluation method: 10 g of each powder hair dye composition according to each Example and Comparative Example was gently placed in a 100 mL measuring cylinder, and after carefully smoothing the top surface as necessary, the bulk volume (cm 3 ) to determine the bulk density a (g / cm 3 The graduated cylinder was then tapped 100 times, and the top surface was carefully smoothed if necessary, and the bulk volume (cm 3 ) and calculate the bulk density b (g / cm 3 The compressibility of each powder hair dye composition according to each Example and Comparative Example was calculated using the following formula: Compression ratio = [(ba) / b] x 100 Evaluation criteria: A powder with a smaller degree of compression has higher fluidity, which is preferable in the present invention, so a degree of compression of 17 or less was evaluated as ◯, a degree of compression of more than 17 but not more than 20 was evaluated as △, and a degree of compression of more than 20 was evaluated as ×. The evaluation results are shown in the corresponding evaluation columns for each Example and Comparative Example in Tables 1 and 2.

[0064] (Evaluation of solubility) Evaluation method: 6 g of the powder hair dye composition according to each Example and Comparative Example was placed in a mixing container with a flat bottom (diameter: 100 mm, cylindrical shape), and after leveling, 60 g of water was added. Immediately after that, the brush was rotated in a circular motion over the bottom of the mixing container at a speed of 1 rotation per second to mix the powder hair dye composition with the water, and the time until clumps of the powder hair dye composition could no longer be seen was measured. Evaluation criteria: To evaluate solubility, 10 trained panelists were selected and given a common understanding of the standardized rotational movement of the brush and the state of "no visible clumps," and then presented with the following evaluation criteria. Rank 〇: The lumps had completely disappeared within one minute of starting the mixing operation. Rank △: Some lumps remained one minute after the start of mixing. Rank x: Conspicuous lumps remained even after 1 minute had passed since the start of mixing. For each Example and Comparative Example, if the panelists' evaluations did not match, the most common evaluation rank was used. There were no cases where there were multiple most common evaluation ranks. The evaluation results are shown in the corresponding evaluation column for each Example and Comparative Example in Tables 1 and 2.

[0065] (Evaluation of operability) Evaluation method: 3 g of the powder hair dye composition according to each Example and Comparative Example and 30 g of water were placed in a 100 mL mixing container and mixed for 2 minutes at a speed of 1 rotation per second using a stirring rod to prepare a hair dye application solution. Ten panelists each applied each hair dye application solution to human hair using a brush. These panelists had previously undergone this type of evaluation training, and practiced using a sample hair dye application solution prior to the evaluation to ensure standardization of the evaluation. Evaluation criteria: The operability was evaluated according to the following criteria. When the panelists' evaluations did not match, the most common evaluation rank was used. There were no cases where there were multiple most common evaluation ranks. The evaluation results are shown in the corresponding evaluation columns for each Example and Comparative Example in Tables 1 and 2. 〇: Very easy to apply with a brush, and spreads and adheres well to the hair. △: Can be picked up with a brush, spreads well on hair and adheres well. ×: Difficult to remove with a brush, and does not spread or adhere well to the hair.

[0066] (Evaluation of dyeing uniformity) Evaluation method: 3 g of the powder hair dye composition of each Example and Comparative Example and 30 g of water were placed in a 100 mL mixing container and mixed using a stirring rod to prepare a hair dye application solution. 3 g of the resulting hair dye application solution was applied to 1 g of white hair strand using a brush, and the hair was dyed by leaving it for 40 minutes after application. The dyed hair strand was rinsed with water and shampooed to remove the hair dye application solution, treated with conditioner, wiped dry with a towel, and dried with a hair dryer. Evaluation criteria: After drying, the dyed hair strands were visually inspected by 10 panelists to determine the degree of color unevenness and evaluated whether or not there was any color unevenness. These panelists had undergone training in this type of evaluation in advance, and prior to the evaluation, they were presented with sample hair strands corresponding to each of the following evaluation ranks to ensure standardization of the evaluation. The specific evaluation criteria were as follows: "Evenly dyed" was given a rating of "5", "Almost evenly dyed" was given a rating of "4", "Not very evenly dyed" was given a rating of "3", "Very uneven" was given a rating of "2", and "Very uneven" was given a rating of "1". The average score of the evaluations of the 10 panelists was calculated and rounded off to the nearest whole number to evaluate the dyeing uniformity. The evaluation results are shown in the "Dyeing uniformity" section of Tables 1 and 2.

[0067] [Table 1]

[0068] [Table 2] [Industrial Applicability]

[0069] According to the present invention, it is possible to address issues specific to powder hair dyes, such as ease of handling of the powder hair dye composition, solubility when mixed with a liquid medium, and ensuring appropriate viscosity after mixing with a liquid medium.

Claims

1. A powdery hair dye composition containing (A) a percarbonate and (B) an oxidation dye, The composition further contains (C) guar gum and (D) sucrose fatty acid ester, and the mass ratio (D) / (C) of the content of the (D) sucrose fatty acid ester to the content of the (C) guar gum is within a range of 0.01 to 0.6; A powder hair dye composition, wherein the content of (C) guar gum is 5 to 20% by mass, and the content of (D) sucrose fatty acid ester is 0.2 to 5% by mass.

2. 2. The powder hair dye composition according to claim 1, further comprising one or more of the following (E) to (G): (E) L-threonine (F) Lactose (G) Starch

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