JP6810525B2 - Acid hair dye composition - Google Patents

Description

The present invention relates to an acid hair dye composition containing an acid dye.

Generally, an acid hair dye composition containing an acid dye is known as a hair cosmetic composition. On the other hand, there is known an oxidative hair dye that allows an oxidative dye to penetrate into the cuticle of hair by the action of an alkaline agent, and causes the oxidant to decompose the melanin pigment and develop the color of the dye. The acidic hair dye composition causes the dye to be ionically bonded to a very shallow portion of the cortex to develop a color. Therefore, the acidic hair dye composition has an advantage that damage to the hair can be suppressed as compared with the oxidative hair dye composition. On the other hand, since the hair dyeing power is weaker than that of the oxidative hair dyeing agent, there is a problem that the scalp and the like are soiled when the blending amount and the like are adjusted to improve the hair dyeing power.

Therefore, conventionally, hair dye compositions disclosed in Patent Documents 1 and 2 have been known. Patent Document 1 discloses an acid hair dye containing an acid dye, aromatic alcohols, n-butanol and the like. With such a configuration, the dyeing property on the skin and the like is suppressed while maintaining the hair dyeing power. Patent Document 2 discloses a hair dye composition containing a lauryl pyridinium salt, an acid dye, and the like. With such a configuration, the effect of preventing scalp stains is improved while maintaining the hair dyeing power.

Japanese Unexamined Patent Publication No. 2000-344639 Japanese Unexamined Patent Publication No. 2009-203211

However, in order to improve the practitioner's satisfaction with the hair dye composition, it has been required to achieve both further dyeability and a skin stain prevention effect.
Therefore, an object of the present invention is to provide an acidic hair dye composition capable of obtaining a high hair dyeing effect while suppressing skin stains.

The present invention is based on the finding that 1,2-alkanediol can prevent skin stains without affecting the dyeability. The mass% value indicating the content of the component is a value in the dosage form including the solubilizer such as water.

In order to achieve the above object, in one aspect of the present invention, at least one organic solvent selected from (A) 1,2-alkanediol, (B) aromatic alcohol and carbonic acid ester, and (C) acid dye are used. An acid hair dye composition containing and having a pH of 2 to 5 is provided.

The carbon number of the component (A) may be in the range of 4 to 10. The content of the component (A) in the acidic hair dye composition may be 0.05 to 30% by mass. The mass ratio of the content of the component (A) to the content of the component (B) in the acidic hair dye composition may be 0.01 to 3.

According to the present invention, it is possible to obtain a high hair dyeing effect while suppressing skin stains.

Hereinafter, an embodiment embodying the acidic hair dye composition of the present invention will be described. The acid hair dye composition of the present embodiment contains (A) 1,2-alkanediol, (B) at least one organic solvent selected from aromatic alcohols and carbonic acid esters, and (C) acid dyes. For example, a monohydric alcohol having a carbon number of 1 to 3 and a pH adjusting agent and a chelating agent may be further contained.

(A) 1,2-Alkanediol is blended especially from the viewpoint of preventing skin stains. The number of carbon atoms of the alkane constituting (A) 1,2-alkanediol is not particularly limited, but is preferably 4 to 10 and more preferably 4 to 8 from the viewpoint of improving the effect of preventing skin stains. Specific examples of (A) 1,2-alkanediol include ethylene glycol, 1,2-propanediol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, and 1, Examples thereof include 2-heptandiol, 1,2-octanediol, 1,2-nonanediol and 1,2-decanediol. These may be only one type, or two or more types may be used in combination. Among these, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, and 1,2-decanediol are preferable from the viewpoint of being more excellent in preventing skin stains. ..

The lower limit of the content of (A) 1,2-alkanediol in the acidic hair dye composition is appropriately set, but is preferably 0.05% by mass or more, more preferably 0.1% by mass or more. (A) When the content of 1,2-alkanediol is 0.05% by mass or more, the effect of preventing skin stains can be further improved. On the other hand, the upper limit of the content of (A) 1,2-alkanediol is appropriately set, but is preferably 30% by mass or less, more preferably 20% by mass or less. (A) When the content of 1,2-alkanediol is 30% by mass or less, the hair dyeing power can be further improved.

(B) At least one organic solvent selected from aromatic alcohols and carbonic acid esters is blended particularly for improving hair dyeing power. Specific examples of aromatic alcohols include benzyl alcohol, 2-phenylethyl alcohol, cinnamyl alcohol, phenylpropanol, 1-phenoxy-2-propanol, phenyldiglycol, α-methylbenzyl alcohol, dimethylbenzylcarbinol and benzyl. Examples thereof include oxyethanol, phenoxyethanol, phenoxyisopropanol and p-anisyl alcohol. As the carbonic acid ester, a carbonic acid ester having an alkyl group or an alkylene group having 3 or less carbon atoms is preferably applied from the viewpoint of using it as a solvent. More specifically, for example, dimethyl carbonate, diethyl carbonate, ethylene carbonate (ethylene carbonate), propylene carbonate (propylene carbonate), ethyl methyl carbonate and the like can be mentioned. These organic solvents may be used alone or in combination of two or more. Among these, benzyl alcohol, benzyloxyethanol, and propylene carbonate are preferable from the viewpoint of being more excellent in hair dyeing power.

The lower limit of the content of the component (B) in the acidic hair dye composition is appropriately set, but is preferably 0.1% by mass or more, more preferably 1% by mass or more. When the content of the component (B) is 0.1% by mass or more, the hair dyeing power can be further improved. On the other hand, the upper limit of the content of the component (B) is appropriately set, but is preferably 30% by mass or less, more preferably 20% by mass or less. When the content of the component (B) is 30% by mass or less, the effect of preventing the skin stain of the acidic hair dye composition can be further improved.

Regarding the content ratios of the components (A) and (B) in the acidic hair dye composition, the lower limit of the mass ratio of the content of the component (A) to the content of the component (B) is appropriately set. It is preferably 0.01 or more, more preferably 0.1 or more. When the mass ratio is 0.01 or more, the skin stain prevention effect can be further improved. On the other hand, the upper limit of the mass ratio is appropriately set, but is preferably 3 or less, more preferably 1 or less. When the mass ratio is 3 or less, the hair dyeing power can be further improved.

(C) Acid dyes are added to dye hair. Acid dyes are non-reactive and can develop color by themselves. Specific examples of the acidic dyes include, for example, Red No. 2, Red No. 3, Red No. 102, Red No. 104 (1), Red No. 105 (1), Red No. 106, Red No. 201, Red No. 227, Red 230. No. (1), Red No. 230 (2), Red No. 231, Red No. 232, Red No. 401, Red No. 502, Red No. 503, Red No. 504, Red No. 506, Yellow No. 4, Yellow No. 5, Yellow 202 (1), Yellow 202 (2), Yellow 203, Yellow 402, Yellow 403 (1), Yellow 406, Yellow 407, Orange 205, Orange 207, Orange 402 No., Green No. 3, Green No. 204, Green No. 205, Green No. 401, Green No. 402, Purple No. 401, Blue No. 1, Blue No. 2, Blue No. 202, Blue No. 203, Blue No. 205, Brown No. 201, Black 401, Acid Blue 1, Acid Blue 3, Acid Blue 62, Acid Black 52, Acid Brown 13, Acid Green 50, Acid Orange 6, Acid Red 14, Acid Red 35, Acid Red 73, Acid Red 184, Brilliant Black 1st grade can be mentioned. These may be only one type, or two or more types may be used in combination.

The lower limit of the content of the (C) acid dye in the acid hair dye composition is appropriately set, but is preferably 0.001% by mass or more, more preferably 0.01% by mass or more. (C) When the content of the acid dye is 0.001% by mass or more, the hair dyeing power can be further improved. On the other hand, the upper limit of the content of the (C) acid dye is appropriately set, but is preferably 5% by mass or less, more preferably 3% by mass or less. When the content of the (C) acid dye is 5% by mass or less, the solubility of the (C) acid dye in the acidic hair dye composition can be further improved. In addition, the effect of preventing skin stains can be further improved.

The monohydric alcohol having a carbon number in the range of 1 to 3 may be blended from the viewpoint of further improving the hair dyeing power and the skin stain preventing effect. Specific examples of monohydric alcohols having 1 to 3 carbon atoms include methanol, ethanol, propanol, and isopropanol. These may be only one type, or two or more types may be used in combination.

The lower limit of the content of the monohydric alcohol in the acidic hair dye composition is appropriately set, but is preferably 1% by mass or more, more preferably 5% by mass or more. When the content of the monohydric alcohol is 1% by mass or more, the hair dyeing power and the effect of preventing skin stains can be further improved. On the other hand, the upper limit of the content of the monohydric alcohol is appropriately set, but is preferably 50% by mass or less, more preferably 30% by mass or less. When the content of the monohydric alcohol is 50% by mass or less, the hair dyeing power of the acidic hair dye composition can be further improved.

Regarding the content ratios of the component (A) and the monohydric alcohol in the acidic hair dye composition, the lower limit of the mass ratio of the content of the component (A) to the content of the monohydric alcohol is appropriately set. It is preferably 0.001 or more, more preferably 0.004 or more. When the mass ratio is 0.001 or more, the skin stain prevention effect can be further improved. On the other hand, the upper limit of the mass ratio is appropriately set, but is preferably 1 or less, more preferably 0.8 or less. When the mass ratio is 1 or less, the hair dyeing power can be further improved.

Regarding the content ratios of the component (B) and the monohydric alcohol in the acidic hair dye composition, the lower limit of the mass ratio of the content of the component (B) to the content of the monohydric alcohol is appropriately set. It is preferably 0.1 or more, more preferably 0.12 or more. When the mass ratio is 0.1 or more, the hair dyeing power can be further improved. On the other hand, the upper limit of the mass ratio is appropriately set, but is preferably 1 or less, more preferably 0.8 or less. When the mass ratio is 1 or less, the skin stain prevention effect can be further improved.

The pH adjuster may be added to adjust the pH of the acidic hair dye composition. The pH adjuster is appropriately selected from known ones. Specific examples of the pH adjuster include inorganic acids, organic acids and salts thereof, ammonia, alkanolamines, silicates, carbonates, bicarbonates, metasilicates, sulfates, chlorides, phosphates, and bases. Examples include sex amino acids. Specific examples of the organic acid include citric acid, glycolic acid, succinic acid, tartaric acid, lactic acid, malic acid, levulinic acid, acetic acid, butyric acid, valeric acid, oxalic acid, maleic acid, fumaric acid, mandelic acid and the like. .. Of these, lactic acid, levulinic acid, and glycolic acid are preferably applied. Specific examples of the organic acid salt include sodium salt, potassium salt, ammonium salt and the like. These may be only one type, or two or more types may be used in combination.

The lower limit of the pH of the acidic hair dye composition in the present embodiment is 2 or more, preferably 2.5 or more. When the pH of the acidic hair dye composition is 2 or more, the effect of preventing skin stains can be further improved. On the other hand, the upper limit of pH is 5 or less, preferably 4.5 or less. When the pH of the acidic hair dye composition is 5 or less, the hair dyeing power can be further improved.

The chelating agent may be blended from the viewpoint of further improving the hair dyeing power. Specific examples of the chelating agent include edetic acid (ethylenediaminetetraacetic acid (EDTA)), disodium edetate, tetrasodium edetate, diethylenetriaminepentaacetic acid and its salts, hydroxyethylethylenediaminetriacetic acid and its salts, and hydroxyethane. Examples thereof include diphosphonic acid (HEDP) and salts thereof. These may be only one type, or two or more types may be used in combination.

The lower limit of the content of the chelating agent in the acidic hair dye composition is appropriately set, but is preferably 0.01% by mass or more, more preferably 0.1% by mass or more. When the content of the chelating agent is 0.01% by mass or more, the hair dyeing power can be further improved. On the other hand, the upper limit of the chelation content is appropriately set, but is preferably 5% by mass or less, more preferably 2% by mass or less. When the content of the chelating agent is 5% by mass or less, the effect of preventing skin stains can be further improved.

The acidic hair dye composition may contain components other than the above-mentioned components, for example, solubilizers other than the above, hair penetrants other than the above, water-soluble polymers, oily components, surfactants, sugars, preservatives, as required. Stabilizers, plant extracts, crude drug extracts, vitamins, fragrances, antioxidants, UV absorbers and the like may be further contained.

Solubilizers other than the above are added, for example, to adjust the properties of the acidic hair dye composition. Examples of solubilizers used include water and organic solvents (solvents). Further, an organic solvent may be blended from the viewpoint of further improving the hair dyeing power of the acid dye. Specific examples of the organic solvent include glycols and glycerins as polyhydric alcohols, and diethylene glycol lower alkyl ethers. Specific examples of glycols include diethylene glycol, triethylene glycol, dipropylene glycol, isoprene glycol, hexylene glycol, 1,3-butylene glycol and the like. Specific examples of glycerins include glycerin, diglycerin, polyglycerin and the like. Specific examples of the diethylene glycol lower alkyl ether include diethylene glycol monoethyl ether (ethyl carbitol) and the like. Of these solubilizers, only one type may be contained alone, or two or more types may be contained in combination. Among these, water is preferably used because it has an excellent ability to dissolve other components in the acidic hair dye composition. When water is used as the solvent, the content of water (content at the time of use) in the acidic hair dye composition is preferably 40% by mass or more, and more preferably 50% by mass or more.

Penetration accelerators other than the above may be added in order to improve the hair dyeing power of the acid dye. Examples of the permeation accelerator include monohydric alcohols having 4 to 8 carbon atoms, ethylene glycol alkyl ethers, cyclic alcohols and the like. Specific examples of monohydric alcohols having 4 to 8 carbon atoms include n-butanol, isobutanol, n-pentanol, n-hexanol, n-heptanol, n-octanol and the like. Specific examples of the ethylene glycol alkyl ether include ethylene glycol mono-n-butyl ether and the like. Specific examples of the cyclic alcohol include cyclohexanol and the like. These may be only one type, or two or more types may be used in combination.

The water-soluble polymer compound imparts an appropriate viscosity to the acidic hair dye composition. Therefore, the acidic hair dye composition may contain a water-soluble polymer compound within a range that does not impair the effects of the present invention. Examples of the water-soluble polymer compound include natural polymers, semi-synthetic polymers, synthetic polymers, and inorganic polymers. Specific examples of natural water-soluble polymer compounds include guar gum, locust bean gum, quince seed, carrageenan, galactan, arabic gum, tragacanth gum, pectin, mannan, xanthan gum, dextran, succinoglucan, curdlan, hyaluronic acid, etc. Examples thereof include gelatin, casein, albumin, collagen and dextrin.

Specific examples of semi-synthetic water-soluble polymer compounds include, for example, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxyethyl cellulose dimethyldiallyl ammonium chloride, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, hydroxypropyl methyl cellulose, cationized cellulose, and cationization. Examples thereof include guar gum, starch phosphate ester, propylene glycol alginate, and alginate.

Specific examples of the synthetic water-soluble polymer compound include polyvinylcaprolactam, polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), vinylpyrrolidone-vinyl acetate (VP / VA) copolymer, polyvinylbutyral, polyvinylmethyl ether, and carboxyvinyl. Polymers, sodium polyacrylate, polyacrylamide, polyethylene oxide, ethylene oxide / propylene oxide block copolymers, acrylate / alkyl acrylate copolymers, polydimethylmethylene piperidinium chloride, polyethylene glycol, highly polymerized polyethylene glycol, etc. Can be mentioned. Specific examples of the synthetic polymer include semi-esters of itaconic acid and polyoxyethylene (hereinafter referred to as "POE") alkyl ether, or esters of methacrylic acid and POE alkyl ether, and acrylic acid and methacrylic acid. And a copolymer composed of at least one monomer selected from those alkyl esters. Of these water-soluble polymer compounds, only one type may be contained alone, or two or more types may be contained in combination. Among these, a nonionic polymer is preferably applied from the viewpoint of being excellent in the effect of imparting a viscosity having good coatability.

The oily component gives the hair a moisturizing sensation. Therefore, the acidic hair dye composition may contain an oily component within a range that does not impair the effects of the present invention. Examples of the oily component include fats and oils, waxes, higher alcohols, hydrocarbons, higher fatty acids, alkyl glyceryl ethers, esters, silicones and the like.

Specific examples of fats and oils include Argania spinosa kernel oil, lanolin, olive oil, camellia oil, shea butter, almond oil, saflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, corn oil, rapeseed oil, rice bran oil, etc. Examples thereof include rice germ oil, grape seed oil, avocado oil, macadamia nut oil, castor oil, coconut oil, and evening primrose oil. Specific examples of wax include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin wax and the like. Specific examples of higher alcohols include cetyl alcohol (cetanol), 2-hexyldecanol, stearyl alcohol, isostearyl alcohol, cetostearyl alcohol, oleyl alcohol, araquil alcohol, behenyl alcohol, 2-octyldodecanol, lauryl alcohol, and myristyl alcohol. , Decyltetradecanol, lanolin alcohol and the like.

Specific examples of the hydrocarbon include paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, mineral oil, squalane, polybutene, polyethylene, microcrystalline wax, petrolatum and the like. Specific examples of the higher fatty acid include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, 12-hydroxystearic acid, oleic acid, lanolin fatty acid and the like. Specific examples of the alkyl glyceryl ether include batyl alcohol, kimil alcohol, ceracyl alcohol, isostearyl glyceryl ether and the like.

Specific examples of the ester include diisopropyl adipate, isopropyl myristate, cetyl octanate, isononyl isononanoate, octyldodecyl myristate, isopropyl palmitate, stearyl stearate, myristyl myristate, isotridecyl myristate, and 2-ethyl palmitate. Hexil, octyldodecyl ricinolate, fatty acid cholesteryl / lanosteryl having 10 to 30 carbon atoms, cetyl lactate, lanolin acetate, ethylene glycol di-2-ethylhexanoate, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, capric acid Examples thereof include cetyl, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, and cetyl 2-ethylhexanoate.

Specific examples of silicone include, for example, dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, terminal hydroxyl group-modified dimethylpolysiloxane, highly polymerized silicone, and polyether-modified silicone (for example,). (PEG / PPG / butylene / dimethicone) copolymer), amino-modified silicone, betaine-modified silicone, alkyl-modified silicone, alkoxy-modified silicone, mercapto-modified silicone, carboxy-modified silicone, fluorine-modified silicone and the like. Of these oily components, only one type may be contained alone, or two or more types may be contained in combination.

The surfactant emulsifies or solubilizes the acidic hair dye composition at the time of use as an emulsifier or a component for solubilizing each component, and adjusts the viscosity or improves the viscosity stability. Therefore, the acidic hair dye composition may contain a surfactant within a range that does not impair the effects of the present invention. Examples of the surfactant include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.

Specific examples of anionic surfactants include, for example, alkyl ether sulfate, alkyl sulfate, alkyl ether sulfate, alkenyl ether sulfate, alkenyl sulfate, olefin sulfonate, alkane sulfonate, saturated or unsaturated. Examples thereof include fatty acid salts, alkyl or alkenyl ether carboxylates, α-sulfon fatty acid salts, N-acylamino acid-type surfactants, phosphoric acid mono- or diester-type surfactants, sulfosuccinic acid esters, and derivatives thereof. Specific examples of the counterion of the anion group of these surfactants include sodium ion, potassium ion, triethanolamine and the like. More specifically, examples of the alkyl ether sulfate ester salt include POE sodium lauryl ether sulfate. Specific examples of the alkyl sulfate include sodium lauryl sulfate, sodium cetyl sulfate and the like. Specific examples of the alkyl sulfate derivative include POE sodium lauryl sulfate and the like. Specific examples of the sulfosuccinate include lauryl disodium sulfosuccinate and the like.

Specific examples of the cationic surfactant include, for example, lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, alkyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, Examples thereof include lanolin ethyl sulfate fatty acid aminopropyl ethyldimethylammonium, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, methacryloyloxyethyltrimethylammonium chloride, and behenyltrimethylammonium methylsulfate.

Specific examples of the amphoteric tenside include cocobetaine, lauramidopropyl betaine, cocamidopropyl betaine, sodium lauroanphoacetate, sodium cocoamphoacetate, coconut oil fatty acid amide propyl betaine, and lauryl betaine (lauryldimethylaminoacetic acid betaine). Can be mentioned.

Specific examples of the nonionic surfactant include an ether type nonionic surfactant, an ester type nonionic surfactant, an alkyl glucoside and the like. Specific examples of ether-type nonionic surfactants include POE cetyl ether (Cetes), POE stearyl ether (Staires), POE behenyl ether, POE oleyl ether (Ores), POE lauryl ether (Laures), and POE octyldodecyl. Examples thereof include ether, POE hexyl decyl ether, POE isostearyl ether, POE nonylphenyl ether, POE octylphenyl ether and the like.

Specific examples of the ester-type nonionic surfactant include POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, POE sorbitan trioleate, and POE glycerin monostearate. POE glycerin monomyristate, POE sorbit tetraoleate, POE sorbit hexastearate, POE sorbit monolaurate, POE sorbit Mitsurou, polyethylene glycol monooleate, polyethylene glycol monostearate, polyethylene glycol monolaurate, monooleic acid prooleate Glycerin, lipophilic glycerin monostearate, self-emulsifying glycerin monostearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, sucrose fatty acid Examples thereof include esters, decaglyceryl monolaurate, decaglyceryl monostearate, decaglyceryl monooleate, and decaglyceryl monomyristate.

Specific examples of the alkyl glucoside include alkyl (8 to 16 carbon atoms) glucoside, POE methyl glucoside, POE dioleate methyl glucoside and the like. Among the specific examples of these surfactants, only one type may be contained alone, or two or more types may be contained in combination.

Specific examples of the sugar include monosaccharides such as glucose and galactose, disaccharides such as maltose, sucrose, fructose and trehalose, and sugar alcohols. Specific examples of the preservative include paraben, methylparaben, sodium benzoate and the like. Specific examples of the stabilizer include phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, tannic acid and the like. Specific examples of the antioxidant include ascorbic acid, sulfites and the like.

The dosage form of the acidic hair dye composition is not particularly limited, and specific examples thereof include liquid, gel, foam, and cream. Examples of the liquid include an aqueous solution, a dispersion, an emulsion and the like. Further, from the viewpoint of improving storage stability, the acidic hair dye composition may be stored separately as a solid component and a liquid component, and may be mixed immediately before use. The viscosity of the acidic hair dye composition is not particularly limited, but is preferably adjusted in the range of 1 to 100 mPa · s at 25 ° C. from the viewpoint of adhesion to hair, coatability, handleability and the like. The viscosity of the acidic hair dye composition was determined by using a cone-plate type viscometer and using a standard rotor (1 ° 34', R = 24 mm) with a spring with a full-scale torque of 67.37 μN ・ m under the condition of 25 ° C. It can be rotated and measured at a rotation speed of 50 rpm for 1 minute. Specific examples of the cone / plate type viscometer include a TVE-25L type viscometer cone / plate type manufactured by Toki Sangyo Co., Ltd.

The acidic hair dye composition according to the present embodiment has the following advantages.
(1) In this embodiment, (A) 1,2-alkanediol was particularly applied to the acid hair dye composition containing (C) acid dye. Therefore, the effect of preventing skin stains can be improved without lowering the hair dyeing power. Further, in particular, at least one organic solvent selected from (B) aromatic alcohols and carbonic acid esters was applied. Therefore, the hair dyeing power can be improved without lowering the skin stain prevention effect.

The above embodiment may be changed as follows.
-In the above embodiment, it is configured as a one-agent formula in which all the components constituting the acidic hair dye composition are blended. However, each component may be separated into a plurality of agents and mixed immediately before use.

-The acid hair dye composition of the above embodiment was configured as a semi-permanent hair dye composition containing (C) an acid dye. The product form of the semi-permanent hair dye composition is not particularly limited, and may be, for example, hair manicure, color treatment, color rinse, acidic color and the like. Hair manicure or acidic color is a hair dye that dyes a desired color tone by one hair dyeing operation. On the other hand, color treatment and color rinse are slow-dyeing hair dyes that are applied to hair by daily hair care or the like and are gradually dyed to a desired color tone as a result of repeated hair dyeing treatments.

Next, the embodiment will be described in more detail with reference to Examples and Comparative Examples. The present invention is not limited to the configuration described in the Example column. Hereinafter, Example 17 shall be read as Reference Example 17.
Each component shown in Tables 1 to 3 was mixed to prepare acidic hair dye compositions of Examples and Comparative Examples. Next, each acidic hair dye composition is applied to a 15 cm long human hair bundle (hereinafter, simply referred to as a hair bundle) mixed with gray hair with a brush, left at 30 ° C. for 10 minutes, and then a normal hair bundle is used. It was treated twice with shampoo (manufactured by Hoyu Co., Ltd .: Bigen treatment shampoo). Then, it was dried to obtain a hair dyed hair bundle. The hair dyeing power of the hair dyed hair bundle after the hair dyeing treatment was evaluated. The evaluation results are shown in Tables 1 to 3. The unit of the numerical value indicating the composition of each component in the table is mass%. In addition, the notations (A) to (C) in the "component" column in the table indicate compounds corresponding to each component according to the claims of the present application. The notation "a" in the "component" column in the table indicates a contrasting compound of the component (A) described in the claims of the present application.

(Hair dyeing power)
Ten panelists visually observed the human hair bundles of each example after the hair dyeing treatment under a standard light source to determine whether or not the hair dyeing power of the acidic hair dye composition of each example was good. If the number of panelists who responded that the hair dyeing power was good was 8 or more, it was "excellent: 5", and if it was 6 to 7, it was "good: 4", 4 to 5 people. If it is, it is evaluated as "OK: 3", if it is 2-3 people, it is evaluated as "Slightly defective: 2", and if it is 1 or less, it is evaluated as "Defective: 1". I gave it down. The evaluation results are shown in the evaluation column of hair dyeing power in Tables 1 to 3.

(Skin stain suppression effect)
0.05 g of the acidic hair dye composition of each example was applied to the inner part of the arm in a circular shape having a diameter of 1 cm, left for 5 minutes, and then washed with water. By visually observing the inner part of the arm at this time by 10 panelists, it was judged whether or not the skin of each example of the acidic hair dye composition was not easily soiled. If the number of panelists who responded that the skin is hard to get dirty is 8 or more, it is "excellent: 5", if it is 6 to 7, it is "good: 4", 4 to 5 people. If there is, it is evaluated as "OK: 3", if there are 2 or 3 people, it is evaluated as "Slightly defective: 2", and if it is 1 or less, it is evaluated as "Defective: 1". did. The evaluation results are shown in the evaluation column of the skin stain suppressing effect in Tables 1 to 3.

As shown in Tables 1 and 2, it was confirmed that the evaluation of the hair dyeing power and the skin stain suppressing effect was the result of each Example. As shown in Table 3, it was confirmed that Comparative Examples 1 to 5 containing no 1,2-alkanediol were inferior in the evaluation of the skin stain suppressing effect to each Example. It was confirmed that Comparative Example 6 containing no component (B) was inferior in the evaluation of hair dyeing power to each Example. It was confirmed that Comparative Example 7, in which the pH of the acidic hair dye composition was neutral, was inferior in the evaluation of hair dyeing power to each Example.

Next, the technical idea that can be grasped from the above embodiment and another example will be added below. (A) The acidic hair dye composition further containing a monohydric alcohol or a chelating agent having a carbon number in the range of 1 to 3. (B) The acidic hair dye composition in which the component (A) is 1,2-pentanediol.

Claims (3)

(A) 1,2-alkanediol is carbon number in the range of 4 to 10, (B) containing an aromatic alcohol, and (C) acid dyes, acidic hair dye composition has a pH of 2-5 Stuff. The acidic hair dye composition according to claim 1 , wherein the content of the component (A) in the acidic hair dye composition is 0.05 to 30% by mass. The acidic hair dye composition according to claim 1 or 2 , wherein the mass ratio of the content of the component (A) to the content of the component (B) in the acidic hair dye composition is 0.01 to 3.03.