Hair dyeing agent 1 composition

Abstract

The present invention provides a first-agent hair dye composition that dyes light-colored hair a vivid primary red color, exhibiting high red color saturation and excellent colorfastness. [Solution] A first hair dyeing agent composition containing one or more selected from (A) 1-hydroxyethyl-4,5-diaminopyrazole, (B) 2,6-diaminopyridine, and (C) 5-(2-hydroxyethylamino)-2-methylphenol or m-aminophenol, wherein the mass ratio of component (C) to component (B) [(C) / (B)] is 0.10 to 0.80.

Description

Technical Field

[0001] The present invention relates to a first agent composition for hair dyeing. More specifically, the present invention relates to a first agent composition for hair dyeing containing a specific oxidation dye.

Background Art

[0002] Hair coloring agents are roughly classified into permanent hair dyes such as oxidation hair dyes using oxidation dyes, bleaching agents for lightening hair, semi-permanent hair dyes using direct dyes, and temporary hair dyes for temporarily coloring hair. Among these, the oxidation hair dye, which is a permanent hair dye, is generally composed of a first agent composition for hair dyeing containing an alkaline agent and an oxidation dye, and a second agent composition for hair dyeing containing an oxidizing agent. These are mixed and prepared at the time of use and applied to the hair. Oxidation hair dyes are widely used in various dosage forms such as emulsion form, cream form, etc. as emulsions from the viewpoints of coatability and treatment properties on hair. The alkaline agent swells the hair to open the cuticle and allows the oxidation dye to penetrate into the hair, and at the same time promotes the action of the oxidizing agent contained in the second agent composition for hair dyeing. The oxidation dye develops color by oxidative polymerization with the oxidizing agent contained in the second agent composition for hair dyeing and is fixed from the inside of the hair. Therefore, since the oxidation hair dye dyes from the inside of the hair, it has excellent durability of the hair dyeing effect compared to other hair coloring agents and is currently the most widely used hair coloring agent.

[0003] The oxidation dyes contained in oxidation hair dyes are classified into dye intermediates and couplers. The color development varies depending on the selection and combination of each. Since dye intermediates cause oxidative polymerization among themselves, they have the feature of developing color even when used alone or in a plurality of kinds. On the other hand, a coupler does not develop color whether used alone or in combination of a plurality of kinds, and develops color by oxidative polymerization in combination with a dye intermediate.

[0004] By combining a first-agent hair dye composition with any dye intermediate and coupler, hair can be dyed in a variety of colors. However, the final color after dyeing is greatly influenced by the hair color and brightness before dyeing. In recent years, primary colors such as red and blue have become popular, and consequently, the demand for hair coloring agents that produce primary colors is increasing. In particular, to dye hair red, it is necessary to lighten the hair color beforehand using a bleaching agent or similar. In terms of brightness level, the NPO Japan Hair Color Association has established a level scale that divides hair brightness into 12 stages from 4 to 15, and a brightness level of around 12 or higher is required.

[0005] However, even if the original hair color brightness level is set to level 12, while direct dyes easily produce a vibrant primary red color, oxidative dyes often result in yellowish-orange or bluish-pink shades, making it difficult to achieve a vivid primary red.

[0006] Patent Document 1 describes an oxidative dyeing agent using 1-hydroxyethyl-4,5-diaminopyrazole sulfate, which proposes an oxidative dyeing agent that dyes hair to reddish colors through a specific combination of dyes. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Special Publication No. 2004-518755 [Overview of the project] [Problems that the invention aims to solve]

[0008] Conventional techniques, particularly for dyeing hair lightened by bleaching, involve combining 1-hydroxyethyl-4,5-diaminopyrazole in the first hair dyeing agent composition with several specific couplers. However, this method has the drawback of producing bluish-pink or yellowish-orange colors, rather than a vivid primary red.

[0009] Furthermore, repeatedly bleaching hair to lighten it beforehand as a pretreatment for dyeing places a heavy burden on the hair, leading to hair damage. When highly damaged hair is then dyed with oxidative hair dyes, the developed dye is more likely to leak out of the hair, resulting in fading. Therefore, when bleached hair is dyed with a primary color like red, there are still challenges in maintaining the color's durability.

[0010] The present invention aims to provide a first-agent hair dye composition that dyes light-colored hair a vivid primary red color, exhibiting high red color saturation and excellent colorfastness.

[0011] The inventors have conducted thorough research and found that, (A) 1-Hydroxyethyl-4,5-diaminopyrazole (B) 2,6-diaminopyridine (C) One or more selected from 5-(2-hydroxyethylamino)-2-methylphenol or m-aminophenol We have found that a first hair dyeing agent composition containing the above-mentioned (C) and having a mass ratio [(C) / (B)] of 0.10 to 0.80 of the above-mentioned (B) component solves the above-mentioned problems, and have thus completed the present invention. [Effects of the Invention]

[0012] The present invention provides a first hair dyeing agent composition that dyes light-colored hair a vivid primary red color, exhibiting high red color saturation and excellent colorfastness. [Modes for carrying out the invention]

[0013] The present invention will be described in detail below.

[0014] In this invention, unless otherwise specified, all units indicating content are in mass percent.

[0015] In this invention, primary color red refers to the red color corresponding to hue numbers 6 to 9 in a color chart consisting of 24 hues classified by the Ostwald color circle.

[0016] In this invention, "light hair" refers to hair with a brightness level of 12 or higher on the level scale established by the NPO Japan Hair Color Association, which divides hair brightness into 12 levels from 4 to 15.

[0017] The first hair dyeing composition of the present invention contains (A) 1-hydroxyethyl-4,5-diaminopyrazole as a dye intermediate, and (B) 2,6-diaminopyridine and (C) one or more selected from 5-(2-hydroxyethylamino)-2-methylphenol or m-aminophenol as essential oxidative dyes as couplers. By combining these oxidative dyes, light-colored hair can be dyed a vivid red color from the primary color range.

[0018] The (A) 1-hydroxyethyl-4,5-diaminopyrazole (molecular weight: 142.16) used in the present invention forms a salt, and the salt-forming product is not particularly limited, but examples include 1-hydroxyethyl-4,5-diaminopyrazole sulfate (molecular weight: 240.24), and the present invention contains at least one selected from these.

[0019] The content of (A) 1-hydroxyethyl-4,5-diaminopyrazole used in the present invention (or, if a salt of 1-hydroxyethyl-4,5-diaminopyrazole is used, the content of 1-hydroxyethyl-4,5-diaminopyrazole without the salt) is preferably 0.118 to 0.592%, more preferably 0.237 to 0.592%, and even more preferably 0.296 to 0.592%. If the content of component (A) is less than 0.118%, there is a risk that the saturation of red in light-colored hair will decrease and the color fastness will worsen. If the content of component (A) exceeds 0.592%, no further effects can be expected.

[0020] The content of (B) 2,6-diaminopyridine used in the present invention is preferably 0.3 to 0.5%, more preferably 0.35 to 0.5%, and even more preferably 0.4 to 0.5%. If the content of component (B) is less than 0.3%, the color will not be a primary red, and there is a risk that the saturation of red in light hair will decrease and the color fastness will be poor. If the content of component (B) exceeds 0.5%, no further effect can be expected.

[0021] The content of one or more of (C) 5-(2-hydroxyethylamino)-2-methylphenol or m-aminophenol used in the present invention is preferably 0.045 to 0.36%, more preferably 0.045 to 0.27%, and even more preferably 0.09 to 0.25%. If the content of component (C) is less than 0.045%, the color may not be a primary red. If the content of component (C) exceeds 0.36%, the color may not be a primary red, and the saturation of red in light-colored hair may also decrease.

[0022] From the perspective of the hue and the chroma of red in bright hair, the mass ratio [(C) / (B)] of the above (C) at least one selected from 5-(2-hydroxyethylamino)-2-methylphenol or m-aminophenol to the above (B) 2,6-diaminopyridine is preferably 0.1 to 0.8, more preferably 0.1 to 0.6, and even more preferably 0.2 to 0.56. When [(C) / (B)] is less than 0.1 or exceeds 0.8, the hue will not become the original red color system, or the chroma of red in bright hair will decrease.

[0023] The first agent composition for hair dyeing in the present invention can contain an oxidation dye other than the above (A) component, the above (B) component and the above (C) component as long as the effects of the present invention are not inhibited.

[0024] The oxidation dye other than the above (A) component, the above (B) component and the above (C) component is not particularly limited. For example, p-phenylenediamine, o-aminophenol, p-aminophenol, 5-amino-o-cresol, 1-naphthol, resorcinol, toluene-2,5-diamine, 2,4-diaminophenoxyethanol, 2,2'-[(4-aminophenyl)imino]bisethanol and their salts, etc. can be mentioned. In addition, those listed in the "Standards for Raw Materials of Quasi-Drugs 2006 Integrated Edition" (published by Yakujitsu Shimbunsha in November 2013) can also be appropriately used, and at least one or more selected from these can be contained.

[0025] The first agent composition for hair dyeing in the present invention can contain an alkali agent.

[0026] The alkali agent used in the present invention is not particularly limited. For example, ammonia, alkanolamine, organic amine, hydroxide, carbonate, hydrogen carbonate, metasilicate, phosphate, basic amino acid of an alkali metal or an alkaline earth metal, etc. can be mentioned, and at least one or more selected from these can be contained. [[ID=​Specific examples of the aforementioned alkanolamine include, but are not limited to, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, and triisopropanolamine.

[0028] Specific examples of the aforementioned organic amines, though not limited to them, include 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, morpholine, and guanidine.

[0029] Specific examples of alkali metal or alkaline earth metal hydroxides include, but are not limited to, lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide.

[0030] Specific examples of the carbonate mentioned above include, but are not limited to, sodium carbonate, potassium carbonate, and ammonium carbonate.

[0031] Specific examples of the aforementioned bicarbonate include, but are not limited to, sodium bicarbonate, potassium bicarbonate, and ammonium bicarbonate.

[0032] Specific examples of the aforementioned metasilicate include, but are not limited to, sodium metasilicate, potassium metasilicate, and ammonium metasilicate.

[0033] Specific examples of the phosphate mentioned above are not particularly limited, but include sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, tripotassium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, and triammonium phosphate.

[0034] Specific examples of the aforementioned basic amino acids include, but are not limited to, arginine, lysine, and histidine.

[0035] The content of the alkaline agent is not particularly limited, but preferably 0 to 10%.

[0036] The first hair dyeing composition of the present invention may contain an oily component.

[0037] The oily component is not particularly limited, but examples include higher alcohols, hydrocarbons, oils and fats, waxes, higher fatty acids, ester oils, silicones, etc., and may contain at least one selected from these.

[0038] Specific examples of the aforementioned higher alcohols are, but are not limited to, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, arachidyl alcohol, behenyl alcohol, 2-decyltetradecanol, and the like.

[0039] Specific examples of the hydrocarbons mentioned above are not limited to liquid paraffin, light isoparaffin, light liquid isoparaffin, liquid isoparaffin, heavy liquid isoparaffin, squalane, microcrystalline wax, petrolatum, α-olefin oligomer, polybutene, ceresin, and the like.

[0040] Specific examples of the aforementioned oils and fats are not limited to almond oil, olive oil, camellia oil, shea oil, sunflower oil, rapeseed oil, rice bran oil, rice germ oil, grape seed oil, macadamia nut oil, castor oil, coconut oil, evening primrose oil, avocado oil, peach kernel oil, rosehip oil, argan oil, orange oil, ylang-ylang flower oil, apricot kernel oil, corn oil, pomegranate seed oil, sesame oil, spearmint oil, camellia seed oil, peppermint oil, Hippophae rhamnoides seed oil, Nigella sativa seed oil, geranium oil, bergamot seed oil, loofah seed oil, mink oil, meadowfoam oil, eucalyptus oil, tea leaf oil, lemon fruit oil, rosemary oil, sunflower oil, peanut oil, cottonseed oil, pistachio oil, kukui nut oil, etc.

[0041] Specific examples of the aforementioned waxes, though not limited to them, include beeswax, candelilla wax, carnauba wax, jojoba oil, rice bran wax, shellac wax, and lanolin.

[0042] Specific examples of the aforementioned higher fatty acids include, but are not limited to, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, isostearic acid, undecylenic acid, and lanolinic acid.

[0043] Specific examples of the ester oils mentioned above are not particularly limited, but include isopropyl myristate, butyl myristate, isopropyl palmitate, ethyl stearate, butyl stearate, ethyl oleate, ethyl linoleate, isopropyl linoleate, cetyl caprylate, hexyl laurate, decyl myristate, myristyl myristate, cetyl myristate, decyl oleate, oleyl oleate, cetyl ricinoleate, isostearyl laurate, isotridel myristate, 2-hexyldecyl myristate, isostearate Lyl, 2-octyldodecyl myristate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, isostearyl palmitate, 2-ethylhexyl stearate, 2-hexyldecyl stearate, isodecyl oleate, 2-octyldodecyl oleate, 2-octyldodecyl linoleate, ethyl isostearate, isopropyl isostearate, cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, stearyl 2-ethylhexanoate, hexyl isostearate, ethyleneglycylate di2-ethylhexanoate Glyceryl glycol, ethylene glycol dioleate, propylene glycol dicaprylate, propylene glycol di(caprylate / caprate), propylene glycol dicaprate, neopentyl glycol dicaprylate, neopentyl glycol di2-ethylhexanoate, glyceryl tricaprylate, glyceryl tri2-ethylhexanoate, glyceryl tri(caprylate / caprate), glyceryl triundecylate, glyceryl triisopalmitate, glyceryl triisostearate, trimethylolpropane tri2-ethylhexanoate, triisosodium Trimerilolpropane thearate, pentaerythritol tetra-2-ethylhexanoate, pentaerythritol tetramyristate, pentaerythritol tetraisostearate, 2-octyldodecyl neopentanoate, 2-hexyldecyl 2-ethylhexanoate, isostearyl 2-ethylhexanoate, 2-ethylhexyl isononanoate, 2-hexyldecyl dimethyloctanoate, 2-octyldodecyl dimethyloctanoate, 2-ethylhexyl isopalmitate, 2-hexyldecyl isostearate, isostearyl isostearate,Examples include 2-octyl isostearate.

[0044] Specific examples of the aforementioned silicones are, but are not limited to, dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methylcyclopolysiloxane, alcohol-modified silicone, alkyl-modified silicone, amino-modified silicone, polyether-modified silicone, and the like.

[0045] The first hair dyeing agent composition of the present invention may contain a surfactant.

[0046] The surfactant is not particularly limited, but examples include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants, and may contain at least one selected from these.

[0047] The nonionic surfactant is not particularly limited, but examples include polyoxyethylene (hereinafter referred to as POE) ethers, POE alkylphenyl ethers, POE sorbitan fatty acid esters, POE mono fatty acid esters, POE glycerin fatty acid esters, polyglycerin fatty acid esters, monoglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkyl polyglucosides, and the like.

[0048] Specific examples of the aforementioned POE ethers include, but are not limited to, POE lauryl ether, POE cetyl ether, POE stearyl ether, POE behenyl ether, POE lanolin, and POE phytosterol.

[0049] The number of moles of ethylene oxide added to POE is not particularly limited, but for example, it can range from 2 to 100, and any ethylene oxide exhibiting surfactant activity can be included.

[0050] Specific examples of the cationic surfactant mentioned above are not particularly limited, but include, for example, lauryltrimethylammonium chloride, dicocoyldimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, and behenyltrimethylammonium bromide.

[0051] The anionic surfactant is not particularly limited, but examples include sulfate-type anionic surfactants and N-acylmethylalanine-type anionic surfactants.

[0052] Specific examples of the sulfate-type anionic surfactant include, but are not limited to, alkyl sulfates and POE alkyl ether sulfates.

[0053] Specific examples of the alkyl sulfate mentioned above are not limited to lauryl sulfate and myristyl sulfate (sodium salt, potassium salt, triethanolamine salt, etc.).

[0054] Specific examples of the POE alkyl ether sulfates mentioned above are not particularly limited, but include POE(3) alkyl(12,13) ​​ether sulfate, POE lauryl ether sulfate, POE myristyl sulfate, POE cetyl ether sulfate, and salts thereof (sodium salt, potassium salt, triethanolamine salt, etc.).

[0055] Specific examples of the N-acylmethylalanine type anionic surfactant include, but are not limited to, N-lauroylmethyl-β-alanine, N-coconut oil fatty acid methylalanine, N-myristoylmethylalanine, N-stearoylmethylalanine, N-palmitoylmethylalanine, and salts thereof (sodium salt, potassium salt, triethanolamine salt, etc.).

[0056] The first hair dyeing agent composition in the present invention may contain a polyhydric alcohol.

[0057] The aforementioned polyhydric alcohol is not particularly limited, but examples include glycerin, diglycerin, polyglycerin, ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-butylene glycol, 1,3-propanediol, pentylene glycol, ethylhexylglycerin, sorbitol, xylitol, maltitol, erythritol, mannitol, lactitol, etc., and may contain at least one selected from these.

[0058] The first hair dyeing composition of the present invention may, in addition to the above-mentioned components, optionally contain various components commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc., to the extent that they do not impair the effects of the present invention, such as direct dyes, polymer compounds, humectants, thickeners, medicinal components, protein derivatives, hydrolyzed proteins, amino acids, chelating agents, antioxidants, plant extracts, herbal extracts, vitamins, preservatives, dyes, pigments, powders, pH adjusters, UV absorbers, fragrances, etc., and may contain at least one of these selected. However, it is not limited to these examples.

[0059] The dosage form of the first hair dyeing composition of the present invention is not particularly limited, but can be used in the form of, for example, an emulsion, cream, liquid, foam, gel, or aerosol cream. From the viewpoint of mixability with the second hair dyeing composition and ease of application to hair, a cream form is preferred.

[0060] The viscosity of the first hair dyeing composition in the present invention is not particularly limited, but from the viewpoint of miscibility with the second hair dyeing composition and applicability to hair, it is preferably 1,000 to 100,000 mPa·s, more preferably 3,000 to 50,000 mPa·s, at 20°C.

[0061] The viscosity of the first hair dyeing agent composition in this invention at 20°C was measured after filling a sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.) with 120g of the first hair dyeing agent composition prepared by a conventional method, leaving it standing for 24 hours at 20°C, and then rotating it for 1 minute using a Type B viscometer (Model: Digital Viscometer TVB-10M, manufactured by Toki Sangyo Co., Ltd.) with an M4 rotor at a rotation speed of 6 rpm if the viscosity was less than 100,000 mPa·s, 12 rpm if it was less than 50,000 mPa·s, 30 rpm if it was less than 20,000 mPa·s, and 60 rpm if it was less than 10,000 mPa·s.

[0062] The pH of the first hair dyeing composition in the present invention is preferably 9 to 12 under conditions of 20°C.

[0063] The pH of the first hair dyeing agent composition in the present invention at 20°C is obtained by filling a sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.) with 120g of the first hair dyeing agent composition prepared by a conventional method, leaving it for 24 hours under 20°C conditions, and then measuring the pH of the undiluted solution with a glass electrode type hydrogen ion concentration indicator (F-71, manufactured by Horiba, Ltd.).

[0064] The container used to fill the first hair dyeing composition used in the present invention is not particularly limited, but can be filled into various containers such as plastic containers, aluminum tube containers, poly tube containers, aerosol containers, pouch containers, or jar containers, and stored until use.

[0065] The first hair dyeing agent composition of the present invention is used by mixing it with the second hair dyeing agent composition containing an oxidizing agent at the time of use.

[0066] The aforementioned hair dyeing second agent composition may contain an oxidizing agent.

[0067] The oxidizing agent is not particularly limited, but examples include hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, ammonium persulfate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adducts of peroxides, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, sodium bromate, and others, and at least one selected from these may be included.

[0068] The content of the oxidizing agent is not particularly limited, but is preferably 0.4 to 6%.

[0069] In addition to the above-mentioned components, the second hair dyeing composition may optionally contain various components commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc., to the extent that they do not impair the effects of the present invention, such as surfactants, polymer compounds, oily components, polyhydric alcohols, humectants, thickeners, medicinal components, protein derivatives, hydrolyzed proteins, amino acids, chelating agents, antioxidants, plant extracts, herbal extracts, vitamins, preservatives, dyes, pigments, powders, pH adjusters, UV absorbers, fragrances, etc., and may contain at least one of these selected components. However, it is not limited to these examples.

[0070] The dosage form of the second hair dyeing agent composition is not particularly limited, but can be used in the form of, for example, an emulsion, cream, liquid, foam, gel, or aerosol cream. From the viewpoint of mixability with the first hair dyeing agent composition and ease of application to the hair, a cream or emulsion form is preferred.

[0071] The viscosity of the second hair dyeing agent composition is not particularly limited, but from the viewpoint of miscibility with the first hair dyeing agent composition and applicability to hair, it is preferably 1,000 to 100,000 mPa·s, more preferably 1,000 to 50,000 mPa·s, under conditions of 20°C.

[0072] The viscosity of the aforementioned hair dyeing agent 2 composition at 20°C was measured after filling a sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.) with 120g of the hair dyeing agent 2 composition prepared by a conventional method, leaving it standing for 24 hours at 20°C, and then rotating it for 1 minute using a Type B viscometer (Model: Digital Viscometer TVB-10M, manufactured by Toki Sangyo Co., Ltd.) with an M4 rotor at a rotation speed of 6 rpm if the viscosity was less than 100,000 mPa·s, 12 rpm if it was less than 50,000 mPa·s, 30 rpm if it was less than 20,000 mPa·s, and 60 rpm if it was less than 10,000 mPa·s.

[0073] The pH of the aforementioned second hair dyeing agent composition is preferably 1.5 to 4 under conditions of 20°C.

[0074] The pH of the aforementioned hair dyeing agent 2 composition at 20°C is obtained by filling a sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.) with 120g of the hair dyeing agent 2 composition prepared by a conventional method, leaving it for 24 hours under 20°C conditions, and then measuring the pH of the undiluted solution using a glass electrode type hydrogen ion concentration indicator (F-71, manufactured by Horiba, Ltd.).

[0075] The container in which the aforementioned hair dyeing second agent composition is filled is not particularly limited, but can be, for example, a poly container, an aluminum tube container, a poly tube container, an aerosol container, a pouch container, a jar container, etc., and stored until use.

[0076] The mixed mass ratio of the first hair dyeing composition and the second hair dyeing composition in the present invention (first hair dyeing composition: second hair dyeing composition) is not particularly limited, but is preferably 1:5 to 5:1, and more preferably 1:3 to 2:1. [Examples]

[0077] The present invention will be described in more detail below with reference to examples, but these examples are not intended to limit the present invention in any way. Unless otherwise specified, the units of the numerical values ​​representing the content in each table are in mass percent. In each table, the numbers for component (A) indicate the content as 1-hydroxyethyl-4,5-diaminopyrazole sulfate, and the numbers in parentheses indicate the content as 1-hydroxyethyl-4,5-diaminopyrazole.

[0078] The first hair dyeing agent composition for each example and comparative example was prepared by adding (A) 1-hydroxyethyl-4,5-diaminopyrazole or toluene-2,5-diamine as a dye intermediate, (B) 2,6-diaminopyridine and (C) one or more selected from 5-(2-hydroxyethylamino)-2-methylphenol or m-aminophenol as a coupler, and each component and amount listed in Table 1, to a total of 100 parts by mass.

[0079] In conducting the evaluation tests described in this specification, the "dyed hair color" was confirmed using the following method.

[0080] "Hair dye color" The first hair dyeing agent composition for each example and comparative example and the second hair dyeing agent composition described in Table 2 were mixed in a 1:2 ratio, and 2g of each mixture was uniformly applied to a hair bundle (product number: BR-2-A, manufactured by Beaulux Co., Ltd.; 10cm, 1g) with a brightness equivalent to level 14. After leaving it for 20 minutes, it was thoroughly rinsed with water, washed with shampoo (manufactured by Dariya Co., Ltd.; GREEN BOTTLE Botanical Rich Shampoo Luxury Bergamot scent), towel-dried, and then dried with a hairdryer to prepare the hair bundle for evaluation. One expert panelist visually inspected it under a standard light source.

[0081] In the evaluation tests described herein, "color tone," "saturation of red in light-colored hair," and "fastness" were evaluated using the following methods.

[0082] "Color tone" Each hair bundle prepared in the aforementioned "hair dye color" confirmation test was visually evaluated by one expert panelist according to the following criteria. <Evaluation Criteria> ◎: Evaluated as a primary color red. ○: Evaluated as being close to a primary color red. ×: It was evaluated as not being a primary color red.

[0083] "Red saturation in light-colored hair" Each hair bundle prepared in the aforementioned "hair dye color" confirmation test was visually evaluated by one expert panelist according to the following criteria. <Evaluation Criteria> ◎: The dyed hair color was evaluated as being very vivid. ○: The dyed hair color was evaluated as being vivid. △: The dyed hair color was rated as being slightly too vivid. ×: The hair dye color was rated as not being vivid.

[0084] "Robustness" The hair strands used for evaluation in the aforementioned "Red Saturation in Light Hair" evaluation were used as test strands. Each test strand was wet with lukewarm water at 40°C, washed with shampoo (Dariya Co., Ltd.; GREEN BOTTLE Botanical Rich Shampoo, Luxury Bergamot Scent), towel-dried, and then dried with a hairdryer. This series of operations was repeated 10 times to create evaluation strands, which were then visually evaluated by 15 expert panelists according to the following criteria. <Evaluation Test> ◎: More than 12 out of 15 people evaluated the degree of color fading as being less than that of the test hair bundle. ○: Between 8 and 11 out of 15 people evaluated the degree of discoloration as being less compared to the test hair bundle. △: Between 4 and 7 out of 15 people evaluated the degree of discoloration as being less than that of the test hair bundle. ×: Three or fewer out of 15 people rated the degree of discoloration as less than that of the test hair bundle.

[0085] [Table 1]

[0086] [Table 2]

[0087] [Table 3]

[0088] [Table 4]

[0089] [Table 5]

[0090] In Examples 1 to 17, shown in Tables 3 to 5, good results were obtained in terms of "color tone," "saturation of red in light-colored hair," and "fastness."

[0091] Examples of formulations for the composition are given below. The second agent was prepared using the second agent composition for hair dyeing described in Table 2, in a ratio of 1:2. Better results were obtained in terms of "color," "saturation of red in light hair," and "fastness" compared to the first agent composition for hair dyeing shown in Example 18 below.

[0092] <Example 18: First agent composition for hair dyeing> Component Content (%) (A) 1-Hydroxyethyl-4,5-diaminopyrazole sulfate 0.600 (1-Hydroxyethyl-4,5-diaminopyrazole 0.355) (B) 2,6-Diaminopyridine 0.450 (C) 5-(2-hydroxyethylamino)-2-methylphenol 0.200 (C) m-aminophenol 0.050 POE(40) Cetyl Ether 1,500 POE(20) Cetyl Ether 0.500 POE(10) Cetyl Ether 0.500 Behenyltrimethylammonium chloride 2,400 Cetanol 3,300 Stearyl alcohol 2,500 Liquid paraffin 3,000 Methylpolysiloxane 1.000 L-ascorbic acid 0.500 Sodium sulfite 0.200 Glycerin 4,000 Polydimethyldimethylenepyrrolidinium chloride 0.400 Tetrasodium EDTA tetrahydrate 0.200 28% ammonia solution 3,500 80% monoethanolamine solution 7,000 Avocado oil 0.010 Almond oil 0.010 Jojoba oil 0.010 Fragrance 0.800 Purified water 67.370 Total 100,000 Mass ratio [(C) / (B)]:0.56 Viscosity (20℃) 23,500mPa·s pH (20℃): 11.5 [Industrial applicability]

[0093] The present invention provides a first hair dyeing agent composition that dyes light-colored hair a vivid primary red color, exhibiting high red color saturation and excellent colorfastness.

Claims

1. (A) 1-hydroxyethyl-4,5-diaminopyrazole (B) 2,6-diaminopyridine (C) One or more selected from 5-(2-hydroxyethylamino)-2-methylphenol or m-aminophenol A first hair dyeing agent composition containing the above, wherein the mass ratio of component (C) to component (B) [(C) / (B)] is 0.10 to 0.

80.

2. The first hair dyeing agent composition according to claim 1, wherein the (C) component is 5-(2-hydroxyethylamino)-2-methylphenol.

3. The first hair dyeing agent composition according to claim 1, wherein the content of component (A) is 0.118% by mass or more.

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