JP2022171542A - Oxidative hair dye and method for use of oxidative hair dye - Google Patents

Abstract

To provide an oxidative hair dye and a method for use of an oxidative hair dye with which it is possible to improve destaining performance while maintaining hair dyeing performance, as well as prevent excessive heat generation during mixing.SOLUTION: Provided is an oxidative hair dye comprising a first agent, which comprises (A) a coupler, and a second agent. In the oxidative hair dye, the mass ratio (B/A) of (B) a dye intermediate to the (A) component is 0.4 or less, and the content of the (A) component is 0.3 mass% or more. The component (A) includes (A1) 2,4-diamino phenoxy ethanol and (A2) other couplers. The total of the (A2) other couplers and/or the (B) dye intermediate is at least three. In addition, (C) a carbonate is contained.SELECTED DRAWING: None

Description

The present invention relates to oxidative hair dyes containing couplers.

Oxidative hair dyes are known which consist of a first part containing, for example, an alkaline agent and an oxidation dye, and a second part containing an oxidizing agent, such as hydrogen peroxide. The alkaline agent promotes the action of the oxidizing agent contained in the second agent, and also swells the hair to improve the penetration of the dye into the hair. The oxidizing agent decomposes the melanin pigment in the hair and forms an oxidation dye polymer inside the hair. After the alkaline agent is removed, the hair cuticle is closed and the oxidation dye polymer is enclosed inside the hair.

Since the oxidation dye polymer inside the hair does not decompose easily, the decolorization performance is low. It was necessary to destain using an agent. Furthermore, in some cases, a single destaining treatment cannot be sufficiently destained.

Conventionally, oxidative hair dyes have been used to decompose the dark-toned oxidative dye polymers inside the hair without destaining with a de-staining agent, and to re-dye (re-color) the hair to a clear, bright tone. Are known. For example, the oxidative hair dye disclosed in Patent Document 1 improves the hair dyeing performance by containing a diamine-based dye intermediate or the like as a main component of the dye.

WO2009/057228

An object of the present invention is to provide an oxidative hair dye that can improve de-dyeing performance while maintaining hair-dyeing performance and can suppress excessive heat generation during mixing, and a method for using the oxidative hair dye. is.

As a result of intensive studies on the above-mentioned problems, the inventors have found that by containing 2,4-diaminophenoxyethanol as a coupler, a predetermined amount of another coupler and/or a dye intermediate, and containing a carbonate, The present invention was completed by discovering that the hair dyeing performance can be improved while the hair dyeing performance is maintained, and that excessive heat generation can be suppressed.

That is, the present invention provides an oxidative hair dye comprising (A) a first agent containing a coupler and a second agent,
The oxidative hair dye has a mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) of 0.4 or less,
The oxidative hair dye contains 0.3% by mass or more of the component (A),
(A) containing (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as components,
(A2) other couplers and/or (B) containing a total of three or more dye intermediates,
(C) It is characterized by containing a carbonate.
According to this feature, the oxidative hair dye of the present invention contains 2,4-diaminophenoxyethanol as the component (A1), a predetermined amount of other couplers and/or dye intermediates, and a carbonate. By specifying that it is contained, it is possible to improve the destaining performance while maintaining the hair dyeing performance, suppress heat generation due to mixing, and have the effect of facilitating application to the hair.

Further, the oxidative hair dye of the present invention is characterized in that the content of component (A1) is 0.2% by mass or more.
According to this feature, it is possible to further improve the hair dyeing performance.

The present invention also provides a first agent for an oxidative hair dye containing (A) a coupler, wherein the first agent is the weight of the content of the dye intermediate (B) with respect to the content of the component (A) The ratio (B/A) is 0.4 or less, the first agent contains 0.6% by mass or more of component (A), and (A1) 2,4-diaminophenoxyethanol and (A2 ) other couplers, (A2) other couplers and/or (B) dye intermediates in total of three or more kinds, and (C) carbonates.
According to this feature, the first agent of the present invention contains 2,4-diaminophenoxyethanol as the component (A1), a predetermined amount of other couplers and/or dye intermediates, and a carbonate. By specifying that, the hair dyeing performance is maintained, the destaining performance is improved, and excessive heat generation due to mixing with the second agent is suppressed, so that it is easy to apply to the hair.

Further, the present invention comprises a first agent containing a coupler (A) and a second agent, and the oxidation hair dye obtained by mixing the first agent and the second agent contains the component (A). The mass ratio (B/A) of the content of the dye intermediate (B) to the amount of the dye intermediate is 0.4 or less, and the oxidation hair dye contains 0.3% by mass or more of the component (A), (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as components, (A2) other couplers and/or (B) dye intermediates in total of three or more kinds, and (C) carbonic acid A method for using an oxidative hair dye containing a salt, wherein the first agent and the second agent are divided into the volume (cm ³ ) of the oxidative hair dye and the contact area (cm ² ) of the oxidative hair dye with air. ) (contact area of oxidative hair dye with air (cm ² )/volume of oxidative hair dye (cm ³ )) is less than 0.3.
According to this feature, the method of using the oxidative hair dye of the present invention contains 2,4-diaminophenoxyethanol as the component (A1), contains a predetermined amount of other couplers and/or dye intermediates, and In the oxidative hair dye containing a carbonate, by mixing under specific conditions, it is possible to improve the de-dyeing performance while maintaining the hair dyeing performance, and (A2) other couplers and / or ( B) Since three or more types of dye intermediates are contained in total, excessive heat generation due to mixing of the first agent and the second agent can be suppressed, and there is an effect that it is easy to apply to the hair.

Further, the present invention comprises a first agent containing a coupler (A) and a second agent, and the oxidation hair dye obtained by mixing the first agent and the second agent contains the component (A). The mass ratio (B/A) of the content of the dye intermediate (B) to the amount of the dye intermediate is 0.4 or less, and the oxidation hair dye contains 0.3% by mass or more of the component (A), A method for using an oxidative hair dye containing (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as components and (C) a carbonate, comprising a first agent and a second agent. The ratio of the contact area (cm ² ) of the oxidation hair dye with air to the volume (cm ³ ) of the oxidation hair dye (air contact area (cm ² ) of the oxidation hair dye / of the oxidation hair dye It is characterized by mixing at a volume (cm ³ ) of 0.3 or more.
According to this feature, the method of using the oxidative hair dye of the present invention contains 2,4-diaminophenoxyethanol as the component (A1), contains a predetermined amount of other couplers and/or dye intermediates, and By mixing the carbonate-containing oxidative hair dye under specific conditions, it is possible to improve the de-dyeing performance while maintaining the hair dyeing performance, and furthermore, the oxidative hair dye comes into contact with the air appropriately. Therefore, the heat at the beginning of mixing the first agent and the second agent can be efficiently dissipated, and the mixing of the first agent and the second agent does not generate excessive heat. Therefore, there is an effect that it is easy to apply to hair.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide an oxidative hair dye and a method of using the oxidative hair dye, which can improve the de-dyeing performance while maintaining the hair-dyeing performance and further suppress excessive heat generation due to mixing. can.

[Oxidative hair dye]
The present invention will be described including the best mode for carrying it out. The oxidative hair dye of the present invention is an oxidative hair dye comprising (A) a first agent containing a coupler and a second agent, wherein the oxidative hair dye has a ratio of (A) to the content of the component (A) ( B) The mass ratio (B/A) of the content of the dye intermediate is 0.4 or less, and the oxidative hair dye contains 0.3% by mass or more of the component (A), and the component (A) is ( A1) 2,4-diaminophenoxyethanol and (A2) other couplers, (A2) other couplers and/or (B) dye intermediates in total of three or more kinds, and (C) carbonates It is characterized by
2,4-diaminophenoxyethanol as component (A1), a predetermined amount of other couplers and/or dye intermediates, and a total of three or more components (A2) and/or (B) , and by specifying that it contains a carbonate, there is an effect that it is possible to improve the destaining performance while maintaining the hair dyeing performance, and to suppress excessive heat generation due to mixing. In addition, in the mixing of the first agent and the second agent, by setting the contact area (cm ² ) of the oxidation hair dye with the air / the volume (cm ³ ) of the oxidation hair dye to a certain level or more, excessive It has the effect of suppressing heat generation.

The oxidative hair dye of the present invention does not substantially contain dye intermediates and contains only couplers as oxidation dyes, or contains all dye intermediates in a predetermined amount or less with respect to couplers, and is resistant to alkaline agents. It forms a polymer that is easily decomposed by the drying process, has excellent destaining performance, and has less effect on hair coloring from the next time onwards. In other words, it is an oxidative hair dye with improved recoloring performance.

Oxidative hair dyes are distributed by separating an oxidizing agent and an oxidative dye into different agents, and coloring the oxidative dye inside the hair. Generally, a first agent containing an oxidation dye and a second agent containing a peroxide are provided, and these agents are mixed and used. Here, "mixing and using" means applying a plurality of agents to the hair in one application operation, and not only the operation of mixing and using immediately before, but also the first agent and the second agent. is taken on a comb or the like and mixed on the hair using a comb or the like. As means for applying the oxidative hair dye to the hair, an applicator such as a comb, brush, brush, or applicator may be used to apply the oxidative hair dye to the hair, or the oxidative hair dye may be applied to the hair with a gloved hand. You can

The form of each agent forming the oxidative hair dye of the present invention may be any form.
The mixing ratio of the first part and the second part of the two-component oxidative hair dye is appropriately set in consideration of the concentration, mixability, application method, etc. of each component of the oxidative hair dye, but is preferably 0. .1 to 10:1, more preferably 0.3 to 3:1. The dosage form of the oxidative hair dye is not particularly limited as long as it can be applied to hair, and examples thereof include liquid, cream, gel and the like at 25°C. In addition, the oxidative hair dye after mixing each agent may be in a liquid, cream, gel, or other form that has applicability, and some agents include powders and solids. may Moreover, it may be foamy or misty at the time of use. When foaming, an aerosol foamer container, a non-aerosol foamer container, a shaking container, or the like may be used. In the case of forming a mist, a sprayer may be used.

As described above, the oxidative hair dye is typically a two-agent type consisting of a first agent and a second agent, but may be a multi-agent type consisting of three or more agents. For example, the first agent of a two-agent type is divided into two agents, one containing a coupler and an optional alkaline agent, and the other having a composition other than that, to constitute a three-agent oxidative hair dye. good too. In this case, emulsion stability is further improved.

Each component used in the oxidative hair dye of the present invention will be described in detail below. The content of each component indicates the content in the oxidative hair dye mixed with each agent, unless otherwise specified.

The oxidative hair dye of the present invention contains (A1) 2,4-diaminophenoxyethanol, other couplers (A2) and/or (B) dye intermediates, and (C) carbonates.

[(A) Coupler]
The oxidative hair dye of the present invention contains (A) a coupler. Component (A) contains (A1) 2,4-diaminophenoxyethanol and (A2) another coupler.
<(A1) 2,4-diaminophenoxyethanol>
The oxidative hair dye of the present invention contains (A1) 2,4-diaminophenoxyethanol as component (A). Specific examples include hydrochloride and sulfate of 2,4-diaminophenoxyethanol.
When the (A1) component is a salt, the content of the (A1) component is the value in the desalted form.

The content of component (A1) in the oxidative hair dye is not particularly limited, but is, for example, 0.1 to 5.0% by mass. The lower limit is preferably 0.15% by mass or more, more preferably 0.2% by mass or more, and still more preferably 0.25% by mass or more, and the upper limit is preferably 4.0% by mass or less, more preferably is 3.0% by mass or less, more preferably 2.0% by mass or less. When the amount is 0.1% by mass or more, the hair dyeing performance is improved, and when the amount is 5.0% by mass or less, the destaining performance can be further improved, the heat generation suppression effect due to mixing is enhanced, and the application to the hair is easy. can be

<(A2) Other couplers>
The oxidation hair dye of the present invention contains (A2) couplers other than the (A1) component as the (A) component.
Component (A2) mainly includes m-diamines, aminophenols and diphenols. Specific examples include resorcinol, 5-amino-o-cresol, m-aminophenol, α-naphthol ( 1-naphthol), 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, toluene-3,4-diamine, 2,6-diaminopyridine, diphenylamine, N,N-diethyl-m- Examples include aminophenol, phenylmethylpyrazolone, 1,5-dihydroxynaphthalene, catechol, pyrogallol, phloroglucin, gallic acid, hydroquinone, 3,3'-iminodiphenyl, tannic acid and salts thereof.
Among these, resorcinol, 5-(2-hydroxyethylamino)-2-methylphenol, 2,6-diaminopyridine, m-aminophenol, and 1,5-dihydroxynaphthalene are more preferable from the viewpoint of hair dyeing performance. is mentioned.
One (A2) component may be used alone, or two or more (A2) components may be used in combination.
(A2) When the other coupler is a salt, the content of the (A2) other coupler is the value in its desalted form.

The content of component (A) (the sum of component (A1) and component (A2)) in the oxidative hair dye is not particularly limited, but is, for example, 0.3 to 10.0% by mass. The lower limit is preferably 0.4% by mass or more, more preferably 0.5% by mass or more, still more preferably 0.6% by mass or more, and even more preferably 0.7% by mass or more, and the upper limit , preferably 7.0% by mass or less, more preferably 5.0% by mass or less, and even more preferably 3.5% by mass or less. When the content is 0.3% by mass or more, the hair dyeing performance is improved, and when the content is 10.0% by mass or less, the destaining performance and heat generation suppressing effect can be further improved.

Further, the oxidative hair dye of the present invention contains (A2) other couplers and/or (B) dye intermediates in total of three or more. By containing a total of three or more types of (A2) other couplers and/or (B) dye intermediates, excessive heat generation due to mixing of the first part and the second part can be further suppressed, and the oxidation hair dye can be produced. It has the effect of facilitating application to hair.
The number of types may be 4, 5 or more, but a remarkable effect can be obtained with 3 or more types.

The present inventors have found that an oxidative hair dye having a high coupler ratio in which the mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) is 0.4 or less, (A1) When 2,4-diaminophenoxyethanol and a carbonate are contained, and (A2) other couplers and/or (B) dye intermediates are two or less in total, when mixing the first part and the second part It was found that exotherm occurred. Then, this heat generation is caused by the reaction between the dye polymer of 2,4-diaminophenoxyethanol and (C) carbonate ions derived from carbonate and hydrogen peroxide (the reaction is further accelerated around pH 8 to 9.5). This is presumed to be due to the heat generated when the bond is broken by the peroxocarbonate ion.
In order to suppress this heat generation, it is necessary to reduce the amount of carbonate, set the pH to 7.5 or lower, set the pH to 10 or higher, reduce the amount of hydrogen peroxide, or reduce the amount of 2,4-diaminophenoxyethanol polymer itself. or increase the ratio of polymers other than the polymer of 2,4-diaminophenoxyethanol alone to lower the reaction probability of peroxocarbonate ions derived from carbonate.
As a result of intensive research, the inventors of the present invention found that the more types of (A2) component or / and (B) component are contained in the oxidation hair dye, the less type of (A2) component and / and ( It was found that the effect of suppressing heat generation is higher than when component B is contained in an oxidative hair dye. In particular, it has been found that the heat generation suppressing effect is more remarkable by containing a total of three or more kinds.
In other words, the inventors found that the oxidative hair dye contains a certain amount of the component (A1) to improve the de-dyeing performance while maintaining the hair-dyeing performance, and to suppress excessive heat generation. I found that it is easy to

In addition, as an effect of the present invention, even when mixing in a container called an applicator with a small contact area between the oxidative hair dye and the air, excessive heat generation of the oxidative hair dye can be suppressed. This has the effect of increasing the selection of mixing containers that can be used.

[(B) dye intermediate]
The oxidative hair dye of the present invention may contain (B) a dye intermediate. Dye intermediates are dye precursors, mainly o- or p-phenylenediamines or aminophenols, which are themselves usually colorless or weakly colored compounds.
(B) Specific examples of dye intermediates include p-phenylenediamine, toluene-2,5-diamine (p-toluylenediamine), N-phenyl-p-phenylenediamine, 4,4′-diaminodiphenylamine, p-aminophenol, o-aminophenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylene diamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 1-hydroxyethyl-4,5-diaminopyrazole, 2,4-diaminophenol, salts thereof and the like. Specific examples of salts include hydrochlorides, sulfates, and the like. One type of component (B) may be used alone, or two or more types of component (B) may be used in combination. The first agent may appropriately contain, as dyes other than the specific examples of the oxidation dyes described above, for example, oxidation dyes listed in "Standards for Quasi-drug Ingredients" (published in June 2006, Yakuji Nippo Co., Ltd.). When the (B) dye intermediate is a salt, the content of the (B) dye intermediate is the value in the desalted form.

The content of the component (B) in the oxidative hair dye is not particularly limited, but for example, the mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) is 0.5. It is 0 to 0.4, and the upper limit is preferably 0.3 or less, more preferably 0.2 or less, and still more preferably 0.1 or less.
By setting the mass ratio to 0.4 or less, the destaining performance can be further improved. Therefore, there is an effect of improving the recolor performance.
A mass ratio of 0.0 means that the oxidative hair dye does not substantially contain the component (B). In addition, the content used for calculating the above mass ratio is the value of the desalted form of both (A) and (B).

The upper limit of the content of the dye intermediate (B) in the oxidative hair dye is appropriately set within the range of the mass ratio (B/A) of the above content, preferably 1% by mass or less, more preferably It is 0.9% by mass or less, more preferably 0.5% by mass or less, and particularly preferably the oxidative hair dye does not substantially contain (B) dye intermediates. When the content of the dye intermediate (B) is 1% by mass or less, the destaining performance can be further improved.

[(C) Carbonate]
The oxidative hair dye of the present invention contains (C) a carbonate. (C) Carbonate is an alkaline agent that swells the hair and has the effect of promoting the penetration of dyes and oxidizing agents. Specific examples of component (C) include sodium carbonate, ammonium carbonate, magnesium carbonate, guanidine carbonate, and the like. In addition, the component (C) contains carbamate ions, carbonate ions, and hydrogen carbonate ions. These ions are usually contained in the first agent of the oxidation hair dye. Carbamate, carbonate, bicarbonate ions may be added to the first part in the form of carbamates, carbonates, and/or bicarbonates with counterions liberated in the solubilizer. Specific examples of the carbamate include ammonium carbamate and the like, and specific examples of the hydrogencarbonate include sodium hydrogencarbonate and ammonium hydrogencarbonate.
In addition, one type of (C1) component may be used alone, or two or more types of (C1) components may be used in combination.

The content of component (C) in the oxidative hair dye is not particularly limited, but is preferably 0.1 to 20% by mass. The lower limit is more preferably 0.25% by mass or more, still more preferably 0.5% by mass or more, even more preferably 0.75% by mass or more, and most preferably 1.0% by mass or more. is. The upper limit is more preferably 15% by mass or less, still more preferably 10% by mass or less, even more preferably 5.0% by mass or less, and most preferably 3.0% by mass or less.
When the amount is 0.1% by mass or more, the hair dyeing performance is improved, and when the amount is 20% by mass or less, excessive heat generation due to mixing is suppressed, and there is an effect that it can be easily applied to the hair. In addition, content here shows the value in carbamate, ammonium carbonate, or ammonium hydrogencarbonate conversion.

[Other ingredients]
The oxidative hair dye of the present invention may contain the following components, if necessary, in addition to the above components.
Other components include, for example, direct dyes, alkaline agents other than component (C), oily components, surfactants, solubilizers, antioxidants such as anhydrous sodium sulfite, preservatives such as phenoxyethanol and sodium benzoate. saccharides such as sorbitol and maltose; polyhydric alcohols such as polyethylene glycol and dipropylene glycol; chelating agents such as ethylenediaminehydroxyethyl triacetic acid trisodium dihydrate; , hair growth ingredients, plant extracts, crude drug extracts, amino acids/peptides, urea, vitamins, fragrances, and UV absorbers.

<Direct dye>
The oxidative hair dye of the present invention may contain direct dyes. A direct dye is a compound having a color, and is not particularly limited as long as it adheres to or permeates the hair to dye the hair. Examples thereof include acid dyes, basic dyes, natural dyes, nitro dyes, HC dyes and disperse dyes. It is preferable to contain an acid dye from the viewpoint of hair dyeing performance.
These direct dyes may be blended alone or in combination of two or more depending on the desired color tone of the hair.

Specific examples of acid dyes include Red No. 2, Red No. 3, Red No. 102, Red No. 104 (1), Red No. 105 (1), Red No. 106, Red No. 227 and Red No. 230. (1), Yellow No. 4, Yellow No. 5, Yellow No. 202 (1), Yellow No. 202 (2), Yellow No. 203, Orange No. 205, Orange No. 207, Orange No. 402, Green No. 3 , Green No. 204, Green No. 401, Purple No. 401, Blue No. 1, Blue No. 2, Blue No. 202, Brown No. 201, and Black No. 401.

Specific examples of basic dyes include Basic Blue 3, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 47, Basic Blue 75, Basic Blue 99, Basic Blue 124 , Basic Brown 4, Basic Brown 16, Basic Brown 17, Basic Green 1, Basic Green 4, Basic Orange 1, Basic Orange 2, Basic Orange 31, Basic Red 1, Basic Red 2, Basic Red 22, Basic Red 46, Basic Red 51, Basic Red 76, Basic Red 118, Basic Violet 1, Basic Violet 3, Basic Violet 4, Basic Violet 10, Basic Violet 11:1, Basic Violet 14, Basic Violet 16, Basic Yellow 11, Basic Yellow 28, Basic Yellow 57, Basic Yellow 87 and the like.

Specific examples of natural dyes include gardenia pigments, turmeric pigments, annatto pigments, sodium copper chlorophyllin, paprika pigments, lac pigments, and henna.

Specific examples of nitro dyes include 4-nitro-o-phenylenediamine, 2-nitro-p-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, picramic acid, and picrin. acids, salts thereof, and the like.

Specific examples of HC dyes include HC Blue No.2, HC Blue No.5, HC Blue No.6, HC Blue No.9, HC Blue No.10, HC Blue No.11, HC Blue No. 12, HC Blue No.13, HC Blue No.16, HC Orange No.1, HC Orange No.2, HC Orange No.3, HC Red No.1, HC Red No.3, HC Red No.7, HC Red No.10, HC Red No.11, HC Red No.13, HC Red No.14, HC Violet No.1, HC Violet No.2, HC Yellow No.2, HC Yellow No.4, HC Yellow No.5, HC Yellow No.6, HC Yellow No.9, HC Yellow No.10, HC Yellow No.11, HC Yellow No.12, HC Yellow No.13, HC Yellow No.14, HC Yellow No. 15 and others.

Specific examples of disperse dyes include Disperse Black 9, Disperse Blue 1, Disperse Blue 3, Disperse Blue 7, Disperse Brown 4, Disperse Orange 3, Disperse Red 11, Disperse Red 15, Disperse Red 17, Disperse Violet 1, Disperse Violet 4, Disperse Violet 15 and the like.

The content of the direct dye in the oxidative hair dye is not particularly limited, but is preferably 0.001% by mass or more and 20.0% by mass or less. The lower limit is more preferably 0.05% by mass or more, and still more preferably 0.1% by mass or more. On the other hand, the upper limit is more preferably 15.0% by mass or less, still more preferably 10.0% by mass or less, and particularly preferably 5.0% by mass or less.

<Other alkaline agents>
Other alkali agents other than the component (C) have the effect of swelling the hair and promoting the permeation of dyes and oxidizing agents. Other alkaline agents include, for example, alkanolamines, ammonia, silicates, metasilicates, phosphates, sulfates, chlorides, organic amines, basic amino acids, hydroxides of alkali metals or alkaline earth metals. etc. are exemplified. Specifically, examples of alkanolamine include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, aminomethylpropanol, and isopropylamine, and examples of silicate include sodium silicate, potassium silicate, and the like. Examples of metasilicates include sodium metasilicate and potassium metasilicate, and examples of phosphates include primary ammonium phosphate, secondary ammonium phosphate, disodium monohydrogen phosphate, and trisodium phosphate. Examples of sulfates include ammonium sulfate, examples of chlorides include ammonium chloride, examples of organic amines include 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1, Examples include 3-propanediol and guanidine, examples of basic amino acids include arginine, lysine and salts thereof, and examples of hydroxides of alkali metals or alkaline earth metals include calcium hydroxide, magnesium hydroxide and hydroxide. Examples include sodium and potassium hydroxide.

The content of other alkaline agents in the oxidative hair dye is not particularly limited, but is preferably 0.5 to 10% by mass. The lower limit is more preferably 0.5% by mass or more, still more preferably 0.75% by mass or more, and still more preferably 1.0% by mass or more. The upper limit is more preferably 7% by mass or less, and even more preferably 5% by mass or less.

<Oil component>
The oxidative hair dye of the present invention may contain an oily component. When an oily component is contained, the hair dyeing performance can be further improved. Examples of oily components include higher alcohols, fats and oils, waxes, hydrocarbons, higher fatty acids, esters, silicone oils, and fluorine oils. One or two or more of these oily components can be selected and used.

Examples of higher alcohols include cetyl alcohol (cetanol), 2-hexyldecanol, stearyl alcohol, isostearyl alcohol, cetostearyl alcohol, oleyl alcohol, arachyl alcohol, behenyl alcohol, 2-octyldodecanol, lauryl alcohol, myristyl alcohol, and decyl alcohol. Tetradecanol, lanolin alcohol, phytosterol, phytostanol, cholesterol, cholestanol, lanosterol, ergosterol, linoleyl alcohol, linolenyl alcohol and the like.

Fats and oils are triglycerides, triesters of fatty acids and glycerin. Olive oil, rosehip oil, camellia oil, shea butter, macadamia nut oil, almond oil, tea seed oil, sasanqua oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, beef tallow, cocoa butter, corn oil, peanut oil, Rapeseed oil, rice bran oil, rice germ oil, wheat germ oil, pearl barley oil, grape seed oil, avocado oil, carrot oil, castor oil, linseed oil, coconut oil, mink oil, egg yolk oil, argania spinosa kernel oil, lanolin, Evening primrose oil and the like can be mentioned.

Waxes are esters of higher fatty acids and higher alcohols. Specific examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, whale wax, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, bayberry wax, wart wax, kapok wax, shellac wax, lanolin wax, etc.

Hydrocarbons are compounds consisting of carbon and hydrogen. Specific examples of hydrocarbons include liquid paraffin, paraffin, microcrystalline wax, petrolatum, isoparaffins, ozokerite, ceresin, polyethylene, α-olefin oligomer, polybutene, synthetic squalane, squalene, hydrogenated squalane, limonene, turpentine oil, and polyisobutene. , hydrogenated polyisobutene, mineral oil, and the like.

Specific examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, 12-hydroxystearic acid, oleic acid and lanolin fatty acid. Specific examples of alkyl glyceryl ethers include batyl alcohol, chimyl alcohol, selachyl alcohol, and isostearyl glyceryl ether.

Esters are compounds obtained by a dehydration reaction between fatty acids and alcohols. Specific examples of esters include diisopropyl adipate, isopropyl myristate, cetyl octanoate, isononyl isononanoate, octyldodecyl myristate, isopropyl palmitate, stearyl stearate, myristyl myristate, isotridecyl myristate, and 2-ethyl palmitate. Hexyl, octyldodecyl ricinoleate, 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 Cetyl, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, cetyl 2-ethylhexanoate, 2-hexyldecyl adipate, cetyl isooctanoate, diisopropyl sebacate, cetyl ethylhexanoate, butyl stearate, isostearic acid Examples include isocetyl, hexyl laurate, decyl oleate, lauryl lactate, octyldodecyl lactate, N-alkyl glycol monoisostearate, lanolin derivatives and the like.

Silicone oil is a synthetic polymer in which silicon and oxygen with organic groups are alternately linked by chemical bonds. Specific examples of silicone oils include dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, terminal hydroxyl group-modified dimethylpolysiloxane, highly polymerized silicone, polyether-modified silicone (e.g. , (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.

Among the above, amino-modified silicones include, for example, aminopropylmethylsiloxane/dimethylsiloxane copolymer (INCI name: aminopropyldimethicone), aminoethylaminopropylsiloxane/dimethylsiloxane copolymer (INCI name: amodimethicone), Aminoethylaminopropylmethylsiloxane/dimethylsiloxane copolymer (INCI name: trimethylsilyl amodimethicone) and the like.

The content of the oil component in the oxidative hair dye is not particularly limited, but is preferably 0.1 to 20% by mass. The lower limit is more preferably 0.2% by mass or more, still more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and particularly preferably 2.0% by mass or more. is. The upper limit is more preferably 17% by mass or less, still more preferably 15% by mass or less, even more preferably 12% by mass or less, and particularly preferably 10% by mass or less.

[Surfactant]
Surfactants include nonionic surfactants, cationic surfactants, anionic surfactants and amphoteric surfactants.
In the following description, POE indicates a polyoxyethylene chain, POP indicates a polyoxypropylene chain, and the numbers in parentheses following these indicate the number of added moles. Also, the numbers in parentheses following alkyl indicate the number of carbon atoms in the fatty acid chain.

Examples of nonionic surfactants include POE alkyl ethers, POE alkylphenyl ethers, POE/POP alkyl ethers, POE sorbitan fatty acid esters, POE mono fatty acid esters, POE glycerin fatty acid esters, and polyglycerin fatty acid esters. monoglycerol fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkylpolyglucosides, and the like. Specific examples of POE alkyl ethers include POE lauryl ether, POE cetyl ether, POE stearyl ether, POE behenyl ether, POE lanolin, and POE phytosterol.
The number of repeating units of POE and POP is, for example, 2 to 100, and any one can be used as long as it exhibits surface activity.

The content of the nonionic surfactant in the oxidative hair dye is not particularly limited, but is preferably 0.001 to 30% by mass. The lower limit is more preferably 0.01% by mass or more, still more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and particularly preferably 0.2% by mass or more. is. The upper limit is more preferably 20% by mass or less, still more preferably 10% by mass or less, even more preferably 7.0% by mass or less, and particularly preferably 5.0% by mass or less.

Examples of cationic surfactants include monoalkyl-type quaternary ammonium salts, dialkyl-type quaternary ammonium salts, trialkyl-type quaternary ammonium salts, benzalkonium-type quaternary ammonium salts, and monoalkyl ether-type quaternary ammonium salts. Alkyl quaternary ammonium salts such as alkylamine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, amine salts such as Arcobel-type tertiary amine salts, cyclic quaternary ammonium salts such as alkylpyridinium salts and alkylisoquinolium salts salts, benzethonium chloride and the like.

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.

Monoalkyl-type quaternary ammonium salts include, for example, lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, alkyl(16,18)trimethylammonium chloride, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, cetyltrimethylammonium saccharine chloride, Stearyltrimethylammonium, stearyltrimethylammonium bromide, behenyltrimethylammonium chloride, stearyltrimethylammonium saccharin, alkyl (28) trimethylammonium chloride, di-POE (2) oleylmethylammonium chloride, di-POE stearylmethylammonium chloride, POE (1) chloride POP(25) diethylmethylammonium, POPmethyldiethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, behenyltrimethylammonium methylsulfate and the like. Particularly preferred are stearyltrimethylammonium chloride, alkyl(16,18)trimethylammonium chloride and cetyltrimethylammonium chloride.

Examples of dialkyl-type quaternary ammonium salts include dialkyl(12-15) dimethylammonium chloride, dialkyl(12-18) dimethylammonium chloride, dialkyl(14-18) dimethylammonium chloride, dicocoyldimethylammonium chloride, and dicetyl chloride. dimethylammonium, distearyldimethylammonium chloride, isostearyllauryldimethylammonium chloride and the like.

The content of the cationic surfactant in the oxidative hair dye is not particularly limited, but is preferably 0.01 to 10% by mass. The lower limit is more preferably 0.05% by mass or more, and still more preferably 0.1% by mass or more. The upper limit is more preferably 5.0% by mass or less, and still more preferably 3.0% by mass or less.

Examples of anionic surfactants include alkyl ether sulfates, POE alkyl ether sulfates, alkyl sulfates, alkenyl ether sulfates, alkenyl sulfates, olefinsulfonates, alkanesulfonates, and saturated or unsaturated fatty acid salts. , alkyl or alkenyl ether carboxylates, α-sulfone fatty acid salts, N-acyl amino acid type surfactants, phosphoric acid mono- or diester type surfactants, and sulfosuccinates. Counter ions for the anionic groups of these surfactants may be, for example, sodium ions, potassium ions, and triethanolamine.

More specifically, sodium lauryl sulfate, sodium myristyl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, POE sodium lauryl ether sulfate, POE lauryl ether sulfate triethanolamine, POE Ammonium lauryl ether sulfate, POE sodium stearyl ether sulfate, sodium stearoyl methyl taurate, triethanolamine dodecylbenzenesulfonate, sodium tetradecene sulfonate, sodium lauryl phosphate, POE lauryl ether - telluric acid and its salts, N-lauroyl glutamates (lauroyl sodium glutamate, etc.), N-lauroylmethyl-β-alanine salts, N-acylglycine salts, N-acylglutamate salts, higher fatty acids such as lauric acid, myristic acid and salts of these higher fatty acids, 1 or 2 More than one species can be used.

The content of the anionic surfactant in the oxidative hair dye is not particularly limited, but is preferably 0.01 to 5% by mass. The lower limit is more preferably 0.05% by mass or more, and still more preferably 0.1% by mass or more. The upper limit is more preferably 3% by mass or less, and still more preferably 1.5% by mass or less.

Amphoteric surfactants include amino acid type amphoteric surfactants and betaine type amphoteric surfactants.
Specific examples of amino acid type amphoteric surfactants include, for example, N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium (sodium lauroamphoacetate), 2-alkyl-N-carboxymethyl-N-hydroxyethyl Imidazolinium Betaine, Undecyl Hydroxyethylimidazolinium Betaine Sodium, Alkyldiaminoethylglycine Hydrochloride, N-Cocoate Acyl-N'-Carboxyethyl-N'-Hydroxyethylethylenediamine Sodium, N-Cocoate Acyl-N '-Carboxyethoxyethyl-N'-carboxyethylethylenediamine disodium, N-coconut fatty acid acyl-N'-carboxymethoxyethyl-N'-carboxymethylethylenediamine disodium, sodium lauryldiaminoethylglycinate, palm oil fatty acid acyl-N - glycine-type amphoteric surfactants such as sodium carboxyethyl-N-hydroxyethylethylenediamine; aminopropionic acid-type amphoteric surfactants such as sodium laurylaminopropionate, sodium laurylaminodipropionate, triethanolamine laurylaminopropionate; etc.
Specific examples of betaine-type amphoteric surfactants include, for example, coconut oil alkylbetaine, lauryldimethylaminoacetic acid betaine, myristyldimethylaminoacetic acid betaine, stearyldimethylaminoacetic acid betaine, stearyldimethylbetaine sodium, coconut oil fatty acid amidopropyl betaine, palm aminoacetate betaine type amphoteric surfactants such as oil fatty acid amidopropyl betaine, lauramidopropyl betaine, ricinoleic acid amidopropyl betaine, stearyldihydroxyethyl betaine; and sulfobetaine type amphoteric surfactants such as lauryl hydroxysulfobetaine. .

The content of the amphoteric surfactant in the oxidative hair dye is not particularly limited, but is preferably 0.001 to 5% by mass. The lower limit is more preferably 0.005% by mass or more, and still more preferably 0.01% by mass or more. The upper limit is more preferably 3% by mass or less, and still more preferably 2.5% by mass or less.

The total content of all surfactants in the oxidative hair dye is not particularly limited, but is preferably 0.01 to 50% by mass. The lower limit is more preferably 0.05% by mass or more, and still more preferably 0.1% by mass or more. The upper limit is more preferably 40% by mass or less, still more preferably 30% by mass or less.

[Solubilizer]
A solubilizer is added, for example, when the dosage form is liquid. Examples of solubilizers used include, for example, water and organic solvents (solvents). Specific examples of organic solvents include ethanol, n-propanol, isopropanol, methyl cellosolve, ethyl cellosolve, methyl carbitol, ethyl carbitol, benzyl alcohol, phenethyl alcohol, γ-phenylpropyl alcohol, cinnamic alcohol, anise alcohol, p-methylbenzyl alcohol, α-dimethylphenethyl alcohol, α-phenylethanol, ethylene glycol phenyl ether (phenoxyethanol), phenoxyisopropanol, 2-benzyloxyethanol, N-alkylpyrrolidone, alkylene carbonate, alkyl ether and the like. A single solubilizer may be used alone, or two or more solubilizers may be used in combination. Among these, water is preferably applied because of its excellent ability to dissolve other components in the first agent. When water is used as the solvent, the content of water in the mixture (content at the time of use) is preferably 40% by mass or more, more preferably 50% by mass or more.

[Polyhydric alcohol]
The oxidative hair dye of the present invention may contain a polyhydric alcohol. Specific examples of polyhydric alcohols include glycol and glycerin. Moreover, these polyhydric alcohols may be blended alone, or two or more of them may be blended together. Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol (eg, PEG400, PEG1000, PEG1500, PEG1540, etc.), polypropylene glycol, isoprene glycol, 1,3- butylene glycol and the like. Specific examples of glycerin include glycerin, diglycerin, polyglycerin and the like. A single polyhydric alcohol may be used alone, or two or more polyhydric alcohols may be used in combination.

[Composition of second agent]
When the oxidative hair dye of the present invention is used as the first agent of a two-part oxidative hair dye, the second agent may be a general second agent used in the field of oxidative hair dyes. can be done. Although the composition of the second agent is not particularly limited, it preferably contains an oxidizing agent, and the oxidizing agent is preferably hydrogen peroxide. The content of hydrogen peroxide in the second agent is 0.1 to 9.0% by mass, and the lower limit is preferably 1.0% by mass or more, more preferably 2.0% by mass. That's it. The upper limit is preferably 8.0% by mass or less, more preferably 7.0% by mass or less, from the viewpoint of enhancing the heat generation suppressing effect. A sufficient effect as an oxidizing agent can be obtained by setting the concentration to 0.1% by mass or more, and a greater effect as an oxidizing agent can be obtained by setting the concentration to 2.0% by mass or more.

In the above description, the state of the oxidative hair dye after the first part and the second part are mixed has been described, but the present invention provides (A) a coupler-containing oxidative hair dye. In the first agent, the mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) is 0.4 or less, and the first agent is (A) containing 0.6% by mass or more of component (A), containing (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as components (A), (A2) other couplers and/or (B) dye intermediates It may be used as a first agent for an oxidative hair dye that contains a total of three or more hair dyes and (C) a carbonate.
The first agent having this feature can be used as the oxidative hair dye of the present invention when the second agent commonly used in the field of oxidative hair dyes is used.
In addition, the oxidative hair dye after mixing the first agent and the second agent improves the destaining performance while maintaining the hair dyeing performance, and further suppresses excessive heat generated by mixing with the second agent. can.

Also, the mass ratio of the content of (A1) 2,4-diaminophenoxyethanol to the total content of the content of the component (A) and the content of the dye intermediate (B) ((A1)/((A) +(B))) is from 0.01 to less than 1.0. The lower limit is preferably 0.05 or more, more preferably 0.2 or more, and still more preferably 0.3 or more. Also, the upper limit is preferably 0.80 or less, more preferably 0.60 or less, and even more preferably 0.5 or less.
By setting the above mass ratio to 0.01 or more and less than 1.0, it is possible to obtain an oxidative hair dye that has well-balanced hair dyeing power, recoloring property, and heat generation suppression.

The mass ratio of the content of (C) carbonate to the content of component (A) ((C)/(A)) is from 0.01 to 20.0. The lower limit is preferably 0.5 or more, more preferably 0.75 or more, and even more preferably 0.9 or more. Also, the upper limit is preferably 15.0 or less, more preferably 10.0 or less, still more preferably 5.0 or less, and even more preferably 3.0 or less.
By setting the above mass ratio to 0.01 or more and 20.0 or less, it is possible to obtain a harmonious oxidative hair dye having hair dyeing power and an excellent effect of suppressing heat generation.

The mass ratio of the content of (C) carbonate to the content of (A1) 2,4-diaminophenoxyethanol ((C)/(A1) is from 0.1 to 20.0. The lower limit is It is preferably 0.5 or more, more preferably 1.0 or more, and the upper limit is preferably 15.0 or less, more preferably 10.0 or less, still more preferably 7.5 or less, and even more preferably is 5.0 or less.
By setting the above mass ratio to 0.01 or more and 20.0 or less, it is possible to obtain a harmonious oxidative hair dye having hair dyeing power and an excellent effect of suppressing heat generation.

Mass ratio of the content of (C) carbonate to the total content of component (A) and dye intermediate ((C)/((A)+(B))) is between 0.1 and 20.0. The lower limit is preferably 0.5 or more, more preferably 0.9 or more, and still more preferably 1.5 or more. Also, the upper limit is preferably 15.0 or less, more preferably 10.0 or less, still more preferably 7.5 or less, and even more preferably 5.0 or less.
By setting the above mass ratio to 0.01 or more and 20.0 or less, it is possible to obtain an oxidative hair dye that has well-balanced hair dyeing power, recoloring property, and heat generation suppression.

Although the pH of the oxidative hair dye after mixing is not particularly limited, it is preferably 8-12. As a lower limit, it is more preferably 8.5 or more, and still more preferably 9.0 or more. The upper limit is more preferably 11.5 or less, and still more preferably 11 or less. From the viewpoint of improving the hair dyeing performance, the pH is preferably 8 or higher, and from the viewpoint of enhancing the heat generation suppressing effect, the pH is preferably 12 or lower.

Although the viscosity of the first agent is not particularly limited, it is preferably 10 to 100000 mPa·s. Although the viscosity of the second agent is not particularly limited, it is preferably 10 to 100000 mPa·s. The viscosity of the first agent and the second agent can be measured using a B-type viscometer such as a TVB-10 type viscometer, and a rotor suitable for each viscosity under the conditions of 25 ° C. and 1 minute can be measured using
The viscosity of the oxidative hair dye of the present invention is not particularly limited, but the viscosity at 25° C. is, for example, 1000 to 100000 mPa·s. From the viewpoint of suppressing dripping, the lower limit is preferably 2000 mPa·s or more, more preferably 5000 mPa·s or more, and still more preferably 10000 mPa·s or more. The upper limit is preferably 50,000 mPa·s or less, more preferably 40,000 mPa·s or less, and still more preferably 30,000 mPa·s or less, from the viewpoint of operability when applied to hair. The viscosity of the oxidative hair dye can be adjusted by adding an anionic surfactant, a cationic surfactant, or a thickening agent such as a water-soluble polymer. The mixed viscosity of the oxidative hair dye can be measured using a B-type viscometer such as a TVB-10 type viscometer, and measured at 25° C. for 1 minute using a rotor suitable for each viscosity. can be done.

[How to use oxidative hair dye]
The method of using the oxidative hair dye of the present invention has a mixing step and an applying step. After the mixing step, the oxidative hair dye is applied to the hair and an application step is performed to use the oxidative hair dye.
The mixing step is the ratio of the contact area (cm ² ) of the oxidative hair dye with the air to the volume (cm ³ ) of the oxidative hair dye (the ratio of the oxidative hair dye to the air and contact area (cm ² )/volume of oxidation hair dye (cm ³ ) is less than 0.3.

The method for using the oxidative hair dye of the present invention comprises (A) a first agent containing a coupler and a second agent, and the oxidative hair dye obtained by mixing the first agent and the second agent is The mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) is 0.4 or less, and the oxidation hair dye contains the component (A) in an amount of 0.3% by mass or more. contains (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as components (A), and contains a total of three or more types of (A2) other couplers and/or (B) dye intermediates and (C) a method for using an oxidative hair dye containing a carbonate, wherein the first agent and the second agent are the air of the oxidative hair dye with respect to the volume (cm ³ ) of the oxidative hair dye and The ratio of the contact area (cm ² ) of the (air contact area (cm ² ) of the oxidative hair dye/volume (cm ³ ) of the oxidative hair dye) is less than 0.3. Characterized by

By having the above-mentioned mixing step, the hair dyeing performance and the destaining performance are improved, and excessive heat generation does not occur even by mixing the first agent and the second agent. Furthermore, (A2) other couplers and/or (B) dye intermediates are contained in a total of 3 or more, so excessive heat generation can be suppressed by mixing the first and second agents, It has the effect of making it easier to apply.

Also, instead of the mixing process, a heat dissipation mixing process and an application process can be provided. After the radiative mixing process, the oxidative hair dye is applied to the hair, and the oxidative hair dye is used.
The heat radiation mixing step is the ratio of the contact area (cm ² ) of the oxidative hair dye with the air to the volume (cm ³ ) of the oxidative hair dye (air of the oxidative hair dye). contact area (cm ² )/volume of oxidation hair dye (cm ³ )) is 0.3 or more.

The method for using the oxidative hair dye of the present invention comprises (A) a first agent containing a coupler and a second agent, and the oxidative hair dye obtained by mixing the first agent and the second agent is The mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) is 0.4 or less, and the oxidation hair dye contains the component (A) in an amount of 0.3% by mass or more. A method for using an oxidative hair dye containing (A) 2,4-diaminophenoxyethanol and (A2) other couplers as components (A) and (C) a carbonate, comprising: The ratio of the air contact area (cm ² ) of the oxidative hair dye to the volume (cm ³ ) of the oxidative hair dye (air contact area (cm ² ) of the oxidative hair dye) /Volume (cm ³ ) of the oxidizing hair dye)) is 0.3 or more.
By having the heat dissipation mixing step, the oxidation hair dye comes into contact with the air appropriately while improving the hair dyeing performance and the de-dyeing performance. It has the effect of easily dissipating heat, suppressing excessive heat generation, and making it easier to apply to hair.

[About the mixing process]
Any method may be used to mix the first agent and the second agent in the mixing step and the heat radiation mixing step. For example, the first agent and the second agent are put into a container, Examples include a method of mixing by shaking a container, a method of mixing with a stirring rod, a stirring blade, or the like, and a method of mixing with an applicator such as a brush.

In addition, the ratio of the contact area (cm ² ) of the oxidative hair dye with air to the volume (cm ³ ) of the oxidative hair dye (air contact area (cm ² ) of the oxidative hair dye/of the oxidative hair dye) A specific example of the mixing step in which the volume (cm ³ ) is less than 0.3 is mixing in a mixing vessel called an applicator. Further, the case where the oxidative hair dye is mixed at a ratio of air contact area (cm ² )/oxidized hair dye volume (cm ³ ) of 0.3 or more is defined as a heat dissipation mixing step, specifically a dish or a cup. This applies to mixing in a mixing vessel with an open top, such as

The mixing container used in the mixing step is not particularly limited, but for example, the horizontal cross-sectional area of the internal space of the container is 3.1 cm ² (2.0 cm in diameter) or more and 180 cm ² (15 cm in diameter) or less. be.
The mixing vessel used in the heat-dissipating mixing step is not particularly limited, but for example, the internal space of the vessel has a horizontal cross-sectional area of 50 cm ² (8 cm in diameter) or more and 180 cm ² (15 cm in diameter) or less. .

In the case of a mixing container called an applicator, the contact area (cm ² ) of the oxidative hair dye with air/the volume (cm ³ ) of the oxidative hair dye is 0.01 or more and less than 0.3. The horizontal cross-sectional area of the internal space is 3.1 cm ² (diameter 2.0 cm) or more and 56 cm ² (diameter 9.5 cm) or less, and the lower limit is preferably 4.9 cm ² (diameter 2.5 cm). more preferably 7.0 cm ² (diameter 3.0 cm) or more, and the upper limit is preferably 38 cm ² (diameter 7 cm) or less, more preferably 33 cm ² (diameter 6.5 cm) or less, most preferably 28 cm ² (diameter 6.0 cm) or less.
The contact area of the oxidative hair dye with air refers to the contact area with air before the first part and the second part are put into a mixing container and mixing is started.

Next, the embodiment will be described more specifically with reference to examples and comparative examples. The present invention is not limited to the configurations described in Examples.

[About evaluation]
<Reduction of heat generation>
The first part shown in Tables 1 to 3 and the second part were placed in a constant temperature bath at 25°C and the temperature was adjusted to 25°C. Next, the temperature-controlled first agent (40 g) and second agent (40 g) were mixed to prepare an oxidation hair dye (80 g).
Table 1 shows the results of mixing by shaking using an applicator. The mixing of the applicator is a mixing process in which the ratio of the contact area (cm ² ) of the oxidative hair dye with air to the volume (cm ³ ) of the oxidative hair dye is 0.2. "Mixing with an applicator" in Table 2 is the same mixing method. Mixing in a cup has a ratio of the contact area (cm ² ) of the oxidizing hair dye with air to the volume (cm ³ ) of the oxidizing hair dye is 1, and is mixing by radiative mixing.
With 80 g of the oxidative hair dye prepared above in a mixing container (applicator, cup), the outer surface of the container was touched for 60 minutes from the time of mixing, and the heat felt when the maximum temperature was reached was evaluated. The applicator used was a container for Beauty Lab Vanity Color HL Oxide (A) 2 made by Hoyu Co., Ltd., and the cup used was a general resin cup. The heat felt by 10 panelists within 60 minutes after mixing was evaluated according to the following criteria. It was scored on a 5-point scale of not feeling hot (5 points), feeling slightly warm (4 points), feeling warm (3 points), feeling slightly hot (2 points), and feeling hot (1 point). Calculate the average value of the scoring results of each panelist, and the average value is 3.6 points or more "Good: ◎", 2.6 points or more and less than 3.6 points "Fair: ○", and less than 2.6 points was set as "defective: ×" and was used as the evaluation result. The results are shown in the heat generation suppression column of Tables 1 and 2 below.

<Maximum temperature at the center of the oxidative hair dye>
After mixing, the oxidative hair dye was placed in a constant temperature bath at 25°C, and after 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, and 60 minutes after mixing, the oxidation hair dye was dried. The temperature of the center was measured, and the measured maximum temperature was described in Table 1 as the maximum temperature in the oxidative hair dye. In addition, the thermometer performed the measurement with the rod-shaped thermometer of Japanese Industrial Standards.

<Destaining performance and hair dyeing method>
As oxidation hair dyes, a cream-like first agent containing each component shown in Tables 1 and 2 and an emulsion-like second agent containing each component shown in Table 3 were prepared. The numerical values in the columns indicating each component in each table below indicate the content of the component in that column, and the unit is % by mass. The notations (A) to (C) in the "Component" column in each table indicate compounds corresponding to the respective components (A) to (C) described in the claims of the present application.

The 2,4-diaminophenoxyethanol in the table below is obtained by neutralizing the raw material 2,4-diaminophenoxyethanol hydrochloride with NaOH as a pH adjuster. Since 2,4-diaminophenoxyethanol hydrochloride produces 2 mol of hydrochloric acid per 1 mol, it was neutralized by blending 2,4-diaminophenoxyethanol hydrochloride:NaOH=1:2 mol. That is, the first agent contains 2,4-diaminophenoxyethanol in a free form.

For each example and each comparative example, the first agent and the second agent were mixed at a mass ratio of 1:1 to prepare a mixture of the oxidation hair dye of each example. 3 g of the resulting mixture was applied to 1 g of a white hair bundle sample for evaluation (manufactured by Beaulux Co., Ltd.) having a length of 10 cm (hereinafter simply referred to as hair bundle) using a brush. 40 minutes after applying the mixture to the hair bundle, the mixture attached to the hair bundle was washed away with water, and the hair bundle was shampooed (Bigen Treatment Shampoo manufactured by Hoyu Co., Ltd.) twice and rinsed (Bigen Treatment Shampoo manufactured by Hoyu Co., Ltd.). rinse) was applied once. Subsequently, the hair tresses were dried with warm air to obtain dyed hair tresses of each example.

The dyed hair tresses of each example were evaluated for de-dyeing performance or hair dyeing performance on the day following the hair dyeing treatment according to the method described below.

(Method for evaluating destaining performance)
The dyed hair tresses of each example obtained as described above are destained according to a conventional method using a more general decolorizing/destaining agent, "Lece Powder Bleach" (manufactured by Hoyu Co., Ltd.). A destained hair tress was obtained by carrying out.

Then, 10 panelists evaluated the destaining performance visually under a standard light source to determine whether the dyed color tone of the destained hair tresses had good destaining properties, and judged according to the following criteria. . Excellent destaining performance (5 points), good destaining performance (4 points), somewhat good destaining performance (3 points), slightly destaining performance Scored in 5 stages of poor (2 points) for poor destaining performance and poor (1 point) for poor destaining performance, calculated the average value of the scoring results of each panelist, and averaged 4.7 points. Above is "very excellent: 6", 4.0 points or more and less than 4.7 points is "excellent: 5", 3.3 points or more and less than 4.0 points is "good: 4", 2.6 points or more 3 The evaluation results were defined as "good: 3" for less than 3 points, "slightly unsatisfactory: 2" for 1.9 to less than 2.6 points, and "bad: 1" for less than 1.9 points. The results are shown in the "Destaining Performance" column of Tables 1 and 2.

(Method for evaluating hair dyeing performance)
In addition, for the dyed hair tresses of each example obtained as described above, 10 panelists visually evaluated the degree of color development under a standard light source according to the following criteria to determine whether the color development was good. It was judged. Very well dyed (5 points), well dyed (4 points), dyed (3 points), slightly lightly dyed (2 points), and lightly dyed (1 point). However, for the scoring results of each panelist, the average value of 4.7 points or more is “very excellent: 6”, 4.0 points or more and less than 4.7 points is “excellent: 5”, 3.3 points or more and 4.0 Less than "Good: 4", 2.6 to less than 3.3 points "Fair: 3", 1.9 to less than 2.6 points "Slightly poor: 2", and less than 1.9 points was set as "defective: 1". The evaluation results are shown in the "hair dyeing performance" column of Tables 1 and 2. and

As shown in Table 1, when comparing Examples 1 to 3 and Comparative Examples 1 to 6, even if the total content of component (A2) and (B) is the same, component (A2) or / It can be confirmed that the effect of suppressing heat generation is improved when three or more kinds of components and (B) are contained in total. Therefore, it can be confirmed that the dyeing performance can be maintained while the hair dyeing performance is maintained, and the excessive heat generation can be suppressed.
In addition, it can be confirmed that there is a similar tendency in Examples 3-1 to 3-6 and 3-8 to 3-12.
The effect of suppressing heat generation is that when the content of component (A2) and/or component (B) is the same for the oxidizing hair dye, many types of component (A2) and/or component (B) are oxidized. When it is contained in the hair dye, the heat generation suppressing effect is higher. In particular, it was confirmed that a total of 3 or more kinds of substances produced a more remarkable effect.

As shown in Table 2, when comparing Example 7 and Comparative Example 6, a total of three or more components (A2) and/or (B) are not contained, but by mixing in the heat-dissipating mixing step, Evaluation of hair dyeing performance was better than Comparative Example 6. From the above, it can be confirmed that suppressing heat generation due to mixing is preferable from the viewpoint of improving the hair dyeing performance.
Moreover, in Examples 2, 3, 5, and 6, it can be seen that good hair dyeing performance can be obtained both by mixing with an applicator and by mixing with a cup (heat-dissipating mixing step). On the other hand, the heat radiation mixing process (Examples 5 and 6) gave a better evaluation of the hair dyeing performance than the applicator mixing (Examples 2 and 3).
From the above, by including a total of three or more kinds of the (A2) component and/or the (B) component in the oxidative hair dye, the range of mixing conditions is widened, and various mixing methods can be selected. Furthermore, it was found that an oxidative hair dye that can ensure good hair dyeing performance can be obtained.
When Example 1 and Example 4 were compared, the evaluation of the hair dyeing performance was the same in both the applicator mixing process and the heat-dissipating mixing process using a cup. This result shows that the components (A2) and (B) contain more than 3 types in total (5 types in total), so that even when mixed with an applicator, a sufficient heat generation suppressing effect can be obtained. It is presumed that the effect of improving the hair dyeing performance by suppressing heat generation is sufficiently exhibited.
In addition, it was confirmed that Examples 1 to 7 were highly effective in suppressing heat generation, and it was confirmed that the oxidative hair dye was easy to apply to the hair.

The oxidative hair dye of the present invention can be used as a hair dye for dyeing human body hair such as head hair, beard, eyebrows and shin hair. In addition, it may be used for dyeing body hair of animals such as pets.
The oxidative hair dye of the present invention can be used as a hair dye for coloring and a hair dye for self-coloring in beauty salons, barber shops, and the like.

Claims (5)

(A) an oxidation hair dye comprising a first agent containing a coupler and a second agent,
The oxidative hair dye has a mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) of 0.4 or less,
The oxidative hair dye contains 0.3% by mass or more of the component (A),
containing (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as the component (A),
containing a total of three or more of the above (A2) other couplers and/or the above (B) dye intermediates,
(C) An oxidative hair dye containing a carbonate. 2. The oxidative hair dye according to claim 1, wherein the content of the component (A1) in the oxidative hair dye is 0.2% by mass or more. (A) A first agent for an oxidative hair dye containing a coupler,
In the first agent, the mass ratio (B/A) of the content of the dye intermediate (B) to the content of the component (A) is 0.4 or less,
The first agent contains 0.6% by mass or more of the component (A),
containing (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as the component (A),
containing a total of three or more of the above (A2) other couplers and/or the above (B) dye intermediates,
(C) A first agent for an oxidative hair dye, containing a carbonate. (A) The oxidative hair dye comprising a first agent containing a coupler and a second agent, wherein the first agent and the second agent are mixed, has a ratio of (B ) The mass ratio (B/A) of the content of the dye intermediate is 0.4 or less,
The oxidative hair dye contains 0.3% by mass or more of the component (A),
containing (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as the component (A),
containing a total of three or more of the above (A2) other couplers and/or the above (B) dye intermediates,
(C) A method for using an oxidative hair dye containing a carbonate,
The ratio of the air contact area (cm ² ) of the oxidative hair dye to the volume (cm ³ ) of the oxidative hair dye (the air contact area of the oxidative hair dye) (cm ² )/volume of oxidative hair dye (cm ³ )) is less than 0.3. (A) The oxidative hair dye comprising a first agent containing a coupler and a second agent, wherein the first agent and the second agent are mixed, has a ratio of (B ) The mass ratio (B/A) of the content of the dye intermediate is 0.4 or less,
The oxidative hair dye contains 0.3% by mass or more of the component (A),
containing (A1) 2,4-diaminophenoxyethanol and (A2) other couplers as the component (A),
(C) A method for using an oxidative hair dye containing a carbonate,
The ratio of the air contact area (cm ² ) of the oxidative hair dye to the volume (cm ³ ) of the oxidative hair dye (the air contact area of the oxidative hair dye) (cm ² )/volume of oxidative hair dye (cm ³ )) is 0.3 or more.