JP7396622B2 - Oxidative hair dye composition and hair dyeing method - Google Patents

Description

The present invention relates to oxidative hair dye compositions and hair dyeing methods having specific alkalinity and pH.

Oxidative hair dye compositions are known as cosmetics for dyeing human hair. The oxidative hair dye composition comprises a first part containing an oxidizing dye and a second part containing an oxidizing agent, and the first part and the second part are used as a mixture when applied to hair etc. It is. When an oxidative hair dye composition is applied to hair, the oxidative dye penetrates into the hair and undergoes oxidative polymerization within the hair to develop color. In addition, since the oxidative hair dye composition forms an oxidative dye polymer, the dye tends to stay inside the hair, and the dyed state is maintained for a longer period of time compared to temporary hair dyes (hair colorants).

Since oxidative hair dye compositions contain an alkaline agent, there is a problem in that repeated use can damage hair and worsen hair conditions such as frizz, spread, and feel. Therefore, an oxidative hair dye composition that suppresses damage to hair is desired.

As an oxidative hair dye composition that suppresses damage to hair, there is an oxidative hair dye composition with a reduced content of an alkaline agent. For example, Patent Documents 1 and 2 disclose an oxidative hair dye composition containing an oxidative dye, ammonia, and hydrogen peroxide that is applied to newly grown hair and dyed hair as an oxidative hair dye composition in which the content of an alkaline agent is adjusted to a minimum. An oxidative hair dye composition is disclosed. Further, Patent Document 3 discloses an oxidative hair dye composition in which not only the content of an alkaline agent but also the pH is adjusted.

International Publication No. 2003/072074 Japanese Patent Application Publication No. 2002-241248 Japanese Patent Application Publication No. 2002-173418

Until now, oxidative hair dye compositions have been developed that reduce damage to hair by lowering the alkalinity of the oxidative hair dye composition or adjusting the pH. The hair dyeing effect on hair treated with the composition (dyed area) cannot be said to be sufficient. The reason for this decrease in hair dyeing effect is that acidic components contained in hair cosmetics such as shampoos and treatments, acidic hair dye compositions, etc. used daily remain in the hair. Conventional oxidative hair dye compositions with adjusted alkalinity and pH are easily affected by acidic components that remain in hair treated with hair cosmetics and acidic hair dye compositions, and the oxidative hair dye composition It is not possible to maintain the optimum pH for the hair dyeing action of the product. Therefore, it is desired to develop an oxidative hair dye composition that not only reduces damage to hair even after repeated use but also exhibits sufficient hair dyeing action.
Therefore, the object of the present invention is to provide an oxidative hair dye composition that exhibits the desired hair dyeing effect regardless of the condition of the hair while suppressing damage to the hair, and a hair dyeing method using the composition on previously dyed areas. The goal is to provide the following.

As a result of intensive studies on the above-mentioned problems, the present inventors have determined that, in an oxidative hair dye composition, (A) an alkaline agent selected from ammonia and/or alkanolamines, and (B) an oxidized dye to which a sulfate or a hydrochloride is added. By incorporating ammonium salt (C) and adjusting the alkalinity and pH to a specific level, it is possible to suppress damage to the hair and improve the desired hair dyeing effect regardless of the condition of the hair. This discovery led to the completion of the present invention.

That is, the present invention provides the following [1] to [5].
[1] An oxidative hair dye composition containing a first agent containing an oxidizing dye and a second agent containing an oxidizing agent, which contains the following components (A), (B), and (C), An oxidative hair dye composition having an alkalinity of 3.0 ml/g or less and a pH of 8.5 to 9.5.
(A) Alkaline agent selected from ammonia and/or alkanolamines (B) Oxidative dye to which sulfate or hydrochloride is added (C) Ammonium salt According to this oxidative hair dye composition, damage to hair is suppressed. At the same time, it can exhibit excellent hair dyeing action regardless of the condition of the hair.
[2] The oxidative hair dye according to [1], wherein the total content (B) + (C) of the component (B) and the component (C) is 0.65% by mass or more. agent composition.
According to this oxidative hair dye composition, it is possible to exhibit excellent hair dyeing action in a wide range of hair conditions while suppressing damage to hair.
[3] Furthermore, the ratio (A)/((B)+(C)) of the content of the (A) component to the total content of the (B) component and the (C) component is 0.5 or less. The oxidative hair dye composition according to [1] or [2], which is characterized in that:
According to this oxidative hair dye composition, it is possible to exhibit excellent hair dyeing action in a wide range of hair conditions while suppressing damage to hair.
[4] The oxidative hair dye composition according to any one of [1] to [3], wherein the component (C) is an ammonium salt of a strong acid.
According to this oxidative hair dye composition, an ammonium salt of a strong acid, which is widely used as an ammonium salt, can be used. Furthermore, fluctuations in pH can be suppressed without increasing alkalinity.
[5] A method for dyeing hair, characterized in that the oxidative hair dye composition according to any one of [1] to [4] is used on previously dyed areas.
According to this hair dyeing method, the hair dyeing effect can be improved regardless of the condition of the hair while suppressing damage to the hair.

According to the present invention, an oxidative hair dye composition and an oxidative hair dye composition that exhibit excellent hair dyeing action regardless of the condition of the hair while suppressing damage to the hair are used in the previously dyed areas of the hair. A hair dyeing method can be provided.

The oxidative hair dye composition of the present invention includes a first part containing an oxidizing dye and a second part containing an oxidizing agent, and the first part and the second part are mixed at the time of use. . The oxidative hair dye composition of the present invention is a composition to be applied to hair, etc., and may contain other agents such as a third agent in addition to the first agent and the second agent.

The oxidative hair dye composition of the present invention also contains (A) an alkaline agent selected from ammonia and/or alkanolamines, (B) an oxidative dye to which a sulfate or hydrochloride has been added, and (C) an ammonium salt. It is characterized by having an alkalinity of 3.0 ml/g or less and a pH of 8.5 to 9.5.

The alkalinity defined by the consumption amount of 0.1N hydrochloric acid standard solution of the oxidative hair dye composition obtained by mixing and preparing the first agent and the second agent is 3.0 ml/g or less. The upper limit is more preferably 2.5 ml/g or less, still more preferably 2.0 ml/g or less. Here, the alkalinity defined by the consumption amount of 0.1N hydrochloric acid standard solution means that a predetermined amount of the oxidized hair dye composition is titrated with 0.1N (0.1 mol/l) hydrochloric acid standard solution, and the titration is It is determined as follows from the consumption amount of 0.1N hydrochloric acid standard solution when the end point is the second inflection point.
Alkalinity = consumption amount of 0.1N hydrochloric acid standard solution [ml] / amount of oxidized hair dye [g]
If the alkalinity of the oxidative hair dye composition of the present invention exceeds 3.0 ml/g, the effects of the present invention cannot be obtained because the damage to the hair becomes strong.

Further, the pH of the stock solution of the oxidative hair dye composition obtained by mixing and preparing the first agent and the second agent is 8.5 to 9.5. If the pH of the oxidative hair dye composition of the present invention is less than 8.5, the hair dyeing effect will be weak, and if the pH exceeds 9.5, the damage to the hair will be strong. The effects of the present invention cannot be obtained unless the value is in the range of 8.5 to 9.5.

The pH of the first agent contained in the oxidative hair dye composition is not particularly limited, but is preferably 7.0 to 13.0. The lower limit value is more preferably 7.5 or more, and even more preferably 8.0 or more. The upper limit is more preferably 12.0 or less, still more preferably 11.0 or less.

The pH of the second agent contained in the oxidizing agent-containing composition is not particularly limited, but is preferably 1.0 to 6.5. The lower limit is more preferably 1.5 or more, still more preferably 2.0 or more. The upper limit is more preferably 6.0 or less, still more preferably 5.5 or less.

The dosage form of the oxidative hair dye composition of the present invention is not particularly limited, and examples include liquid, gel, emulsion, cream, and foam. Considering the applicability to hair etc., it is preferable that the composition be cream-like or foam-like.
In addition, the dosage form of the first agent and the second agent is determined appropriately taking into consideration the storage stability and mixability of the state, and includes, for example, powder, granule, liquid, gel, emulsion, etc. Examples include creamy and foamy forms.

Next, each component used in the oxidative hair dye composition of the present invention will be explained in detail. In addition, regarding the content of each component, unless otherwise specified, the content is shown as the content contained in the oxidative hair dye composition in which each agent is mixed. Furthermore, in the following description, the number in parentheses following "alkyl" indicates the number of carbon atoms in the fatty acid chain.

<(A) Alkaline agent>
The alkaline agent, component (A), is ammonia or alkanolamine, and has the effect of expanding hair and promoting penetration of dyes and oxidizing agents. It also has the effect of improving pH. The alkaline agent which is component (A) is usually added to the first agent, but may be added to other agents.

Specific examples of alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monopropanolamine, isopropanolamine, dipropanolamine, tripropanolamine, 2-amino-2-methyl-1,3-propanediol, Examples include 2-amino-2-methyl-1-propanol and 2-amino-2-hydroxymethyl-1,3-propanediol.
Further, these alkaline agents may be blended alone or in combination of two or more.

The content of component (A) in the oxidative hair dye composition of the present invention is not particularly limited, and is, for example, 0.01% by mass or more and 5.0% by mass or less. The lower limit is preferably 0.03% by mass or more, more preferably 0.05% by mass or more, still more preferably 0.08% by mass or more, particularly preferably 0.1% by mass or more. be. On the other hand, the upper limit is preferably 4.0% by mass or less, more preferably 3.0% by mass or less, even more preferably 2.0% by mass or less, particularly preferably 1.5% by mass. It is as follows.

Further, the oxidative hair dye composition of the present invention may contain an alkaline agent other than the component (A), ammonia and alkanolamine. Examples of alkaline agents other than component (A) include silicates, carbonates, hydrogen carbonates, metasilicates, phosphates, basic amino acids, hydroxides, and salts thereof.

Specific examples of silicates include sodium silicate, potassium silicate, and the like. Specific examples of carbonates include sodium carbonate, magnesium carbonate, guanidine carbonate, and the like. Specific examples of hydrogen carbonate include, for example, sodium hydrogen carbonate. Specific examples of metasilicate include sodium metasilicate, potassium metasilicate, and the like. Specific examples of phosphates include disodium phosphate, trisodium phosphate, and the like. Specific examples of basic amino acids include arginine, lysine, and salts thereof. Specific examples of the hydroxide include calcium hydroxide, magnesium hydroxide, and the like.
Further, these alkaline agents may be blended alone or in combination of two or more.

The content of alkaline agents other than ammonia and alkanolamines in the oxidative hair dye composition of the present invention is not particularly limited. For example, it is 5.0% by mass or less. The upper limit values are, for example, 4.0% by mass or less, 3.0% by mass or less, and 2.0% by mass or less.

<(B) Oxidized dye to which sulfate or hydrochloride is added>
The oxidation dye to which a sulfate or hydrochloride as component (B) is added is a dye that develops color by oxidative polymerization with an oxidizing agent. Oxidation dyes to which sulfate or hydrochloride are added have a dye intermediate and a coupler.The dye intermediate is a substance that develops color by oxidation of itself, and the coupler can produce various color tones by combining with the dye intermediate. It is a substance that
In addition, the oxidative dye to which the sulfate or hydrochloride, which is the component (B), is added and the other oxidative dyes are blended into the first agent.

Dye intermediates are dye precursors, primarily o- or p-phenylene diamines or aminophenols, which are themselves usually colorless or weakly colored compounds.
Specifically, p-phenylenediamine, toluene-2,5-diamine (p-toluylenediamine), N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, p-aminophenol, o-amino Phenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m- Examples include sulfates or hydrochlorides such as cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, and 2,2'-[(4-aminophenyl)imino]bisethanol. One or more dye intermediates can be selected and used depending on the desired hair color tone.

Couplers include mainly sulfates or hydrochlorides of m-diamines, aminophenols, and diphenols. Specifically, m-aminophenol, 5-amino-o-cresol, 5-(2-hydroxyethylamino)-2-methylphenol, m-phenylenediamine, 2,4-diaminophenoxyethanol, toluene-3,4 -Diamine, 2,6-diaminopyridine, diphenylamine, N,N-diethyl-m-aminophenol, 1-hydroxyethyl-4,5-diaminopyrazole, resorcinol, catechol, pyrogallol, phloroglucin, gallic acid, hydroquinone, α- Examples include sulfates or hydrochlorides of naphthol, phenylmethylpyrazolone, 3,3'-iminodiphenyl, 1,5-dihydroxynaphthalene, and tannic acid. One or more couplers can be selected and used depending on the desired hair color tone.

The content of component (B) in the oxidative hair dye composition of the present invention is not particularly limited, and is, for example, 0.01% by mass or more and 10.0% by mass or less. The lower limit is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, still more preferably 0.15% by mass or more, particularly preferably 0.2% by mass or more. be. The upper limit is preferably 7.0% by mass or less, more preferably 5.0% by mass or less, even more preferably 3.0% by mass or less, particularly preferably 2.0% by mass or less. be.

Further, the oxidative hair dye composition of the present invention may contain an oxidative dye other than the oxidative dye to which the sulfate or hydrochloride as component (B) is added.
Oxidation dyes other than oxidation dyes to which sulfate or hydrochloride are added include dye intermediates and couplers to which salts other than sulfate or hydrochloride are added, and dye intermediates and couplers to which no salt is added. . Salts other than sulfate or hydrochloride added to oxidative dyes include addition salts of organic acids and addition salts of inorganic acids. More specifically, for example, hydrobromide, citrate, succinate, tartrate, lactate, tosylate, benzenesulfonate, phosphate, acetate, malate, benzoic acid Salts, salicylates, etc. Among these specific examples, only one type may be contained alone, or two or more types may be contained in combination.

The content of the dye intermediate or coupler other than the oxidation dye to which the sulfate or hydrochloride as component (B) is added is not particularly limited, and is, for example, 0.01% by mass or more and 5.0% by mass. It is as follows. The lower limit is preferably 0.05% by mass or more, more preferably 0.08% by mass or more, still more preferably 0.1% by mass or more, particularly preferably 0.2% by mass or more. be. The upper limit is preferably 4.5% by mass or less, more preferably 4.0% by mass or less, even more preferably 3.5% by mass or less, particularly preferably 3.0% by mass or less. be.

The total content of oxidative dyes in the oxidative hair dye composition is not particularly limited, and is, for example, 0.01% by mass or more and 20.0% by mass or less. The lower limit is preferably 0.02% by mass or more, more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, particularly preferably 0.2% by mass or more. be. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, even more preferably 7.0% by mass or less, particularly preferably 5.0% by mass or less. be. Note that the total content of oxidative dyes is the sum of all dye intermediates, couplers, and salts thereof.

According to the oxidative hair dye composition of the present invention, the oxidative dye to which a sulfate or hydrochloride, which is the component (B), which is usually used for coloring hair, is the alkaline agent, which is the component (A), By containing it together with the ammonium salt which is the component (C) described in , it exhibits not only a hair coloring effect but also an effect of suppressing pH fluctuations of the oxidative hair dye composition when applied to hair. As a result, even when an oxidative hair dye composition adjusted to a low alkalinity for the purpose of suppressing damage to hair is applied, it is less susceptible to the effects of residual acidic components in the hair, making it an excellent dye. It has the effect of exerting a hair effect.

<(C) Ammonium salt>
The ammonium salt, component (C), has the effect of suppressing pH fluctuations. It also has the effect of expanding the hair and promoting the penetration of dyes and oxidizing agents.
Note that the ammonium salt as component (C) is usually blended into the first agent, but may be blended with other agents.

The ammonium salt may be an ammonium salt of a strong acid or an ammonium salt of a weak acid. Specific examples of ammonium salts of strong acids include ammonium halides such as ammonium chloride, ammonium sulfate, and the like. Specific examples of ammonium salts of weak acids include inorganic ammonium salts such as ammonium carbonate, ammonium hydrogen carbonate, ammonium phosphate, and ammonium hydrogen phosphate; organic ammonium salts such as ammonium lactate, ammonium citrate, and ammonium glycolate. Examples include.
Moreover, these ammonium salts may be blended alone or in combination of two or more types.

Since ammonium salts of strong acids do not improve alkalinity, they further exhibit the effect of the present invention of increasing hair dyeability while suppressing damage.

The content of ammonium salt in the oxidative hair dye composition of the present invention is not particularly limited, and is, for example, 0.01% by mass or more and 5.0% by mass or less. The lower limit is preferably 0.05% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.3% by mass or more, particularly preferably 0.5% by mass or more. be. On the other hand, the upper limit is preferably 4.5% by mass or less, more preferably 4.0% by mass or less, still more preferably 3.5% by mass or less, particularly preferably 3.0% by mass. It is as follows.

The total content of components (B) and (C) in the oxidative hair dye composition of the present invention is not particularly limited, and is, for example, 0.02% by mass or more and 10.0% by mass or less. The lower limit is preferably 0.10% by mass or more, more preferably 0.30% by mass or more, still more preferably 0.50% by mass or more, particularly preferably 0.65% by mass or more. be. The upper limit is preferably 8.0% by mass or less, more preferably 6.0% by mass or less, even more preferably 5.0% by mass or less, particularly preferably 4.5% by mass or less. be.
By setting the total content of components (B) and (C) in the oxidative hair dye composition within the above range, the influence of pH reduction due to acidic components remaining inside hair repeatedly treated with the oxidative hair dye composition can be reduced. The effect of being able to reduce As a result, when applied to hair etc., it exhibits the effect of exhibiting an excellent hair dyeing effect.

The ratio of the content of the component (A) to the total content of the components (B) and (C) in the oxidative hair dye composition is not particularly limited, and is, for example, 0.01 or more and 2 or less. be. The lower limit is preferably 0.02 or more, more preferably 0.05 or more, particularly preferably 0.1 or more. The upper limit is preferably 1.5 or less, more preferably 1 or less, still more preferably 0.8 or less, particularly preferably 0.5 or less.
Hair that has been repeatedly treated with an oxidative hair dye composition by setting the ratio of the content of the component (A) to the total content of the components (B) and (C) in the oxidative hair dye composition within the above range. The effect of being able to reduce damage to is more effectively demonstrated.

<Other ingredients>
The oxidative hair dye composition of the present invention may contain the following components as necessary, in addition to the components (A), (B), and (C).

(direct dye)
A direct dye is a compound having a color, and is not particularly limited as long as it is a dye that attaches to or penetrates into hair to dye the hair. Examples include acid dyes, basic dyes, natural dyes, nitro dyes, HC dyes, and disperse dyes.
Further, these direct dyes may be blended alone or in combination of two or more types depending on the desired hair color tone.

(Nonionic surfactant)
A nonionic surfactant is a surfactant that does not exhibit ionicity in an aqueous solution. For example, nonionic surfactants include ether type nonionic surfactants such as polyoxyethylene alkyl ether and polyoxypropylene alkyl ether, ester type nonionic surfactants, and alkanolamide type nonionic surfactants. agents, alkyl glucosides, etc.

Specific examples of ether-type nonionic surfactants include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene behenyl ether, and polyoxyethylene lanolin. , polyoxyethylene phytosterol, etc., and preferably polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, and polyoxyethylene stearyl ether.
Specific examples of ester type nonionic surfactants include glycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, sucrose fatty acid ester, etc. .
The number of repeating units of polyalkylene oxide such as polyoxyethylene is, for example, 2 to 100, preferably 3 to 25.

The content of the nonionic surfactant in the oxidative hair dye composition is not particularly limited, and is preferably 0.001% by mass or more and 30.0% by mass or less. The lower limit is more preferably 0.1% by mass or more, still more preferably 0.5% by mass or more, particularly preferably 1.0% by mass or more. On the other hand, the upper limit is more preferably 10.0% by mass or less, still more preferably 5.0% by mass or less, particularly preferably 3.0% by mass or less.

(Cationic surfactant)
A cationic surfactant is a surfactant whose hydrophilic group, which dissolves in water and undergoes ion dissociation, becomes a cation. For example, alkyl quaternary ammonium salts such as monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, benzalkonium quaternary ammonium salts, monoalkyl ether quaternary ammonium salts, Examples include amine salts such as alkyl amine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, and Acobel type tertiary amine salts, cyclic quaternary ammonium salts such as alkylpyridinium salts and alkylisoquinolium salts, and benzethonium chloride. .

Alkyl quaternary ammonium salts are preferred, monoalkyl quaternary ammonium salts and dialkyl quaternary ammonium salts are more preferred, and monoalkyl quaternary ammonium salts are particularly preferred.

Specific examples of monoalkyl quaternary ammonium salts include lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium chloride, stearyltrimethylammonium bromide, and behenyl chloride. Examples include trimethylammonium, alkyl(28)trimethylammonium chloride, and methacryloyloxyethyltrimethylammonium chloride.
Further, these cationic surfactants may be blended alone or in combination of two or more.

Moreover, the alkyl group of the monoalkyl type quaternary ammonium salt is not particularly limited. For example, the alkyl group of the monoalkyl type quaternary ammonium salt preferably has 6 to 40 carbon atoms. The lower limit is more preferably 8 or more, still more preferably 12 or more, particularly preferably 16 or more, and even more preferably 18 or more. The upper limit is more preferably 35 or less, still more preferably 30 or less, particularly preferably 28 or less, and even more preferably 24 or less.

The content of the cationic surfactant in the oxidative hair dye composition is not particularly limited, and is preferably 0.001% by mass or more and 10.0% by mass or less. The lower limit is more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, particularly preferably 0.3% by mass or more, and even more preferably 0.5% by mass. That's all. The upper limit is more preferably 5.0% by mass or less, still more preferably 3.0% by mass or less, particularly preferably 2.0% by mass or less.

(Anionic surfactant)
Anionic surfactants are surfactants with anionic hydrophilic groups. For example, anionic surfactants include alkyl sulfates, alkyl sulfates, polyoxyethylene alkyl ether sulfates, alkenyl sulfates, alkenyl sulfates, alkenyl ether sulfates, olefin sulfonates, and alkanesulfonates. , saturated fatty acid salts, unsaturated fatty acid salts, alkyl ether carboxylates, alkenyl ether carboxylates, α-sulfone fatty acid salts, N-acyl amino acid type surfactants, phosphoric acid monoester type surfactants, phosphoric acid diester type surfactants Examples include surfactants and sulfosuccinates. Examples of counter ions for the anionic groups of these surfactants include sodium ions, potassium ions, and triethanolamine.

(Ampholytic surfactant)
Amphoteric surfactants are surfactants whose hydrophilic group portions are positively or negatively charged depending on the pH. For example, examples of the amphoteric surfactant include amino acid type amphoteric surfactants and betaine type amphoteric surfactants.

The total content of surfactants in the oxidative hair dye composition is not particularly limited. For example, the total content of surfactants in the oxidative hair dye composition is preferably 0.001% by mass or more and 50.0% by mass or less. The lower limit is more preferably 0.01% by mass or more, still more preferably 0.1% by mass or more, particularly preferably 1.0% by mass or more. On the other hand, the upper limit is more preferably 30.0% by mass or less, still more preferably 20.0% by mass or less, particularly preferably 10.0% by mass or less.

(oily component)
The oily component is not particularly limited as long as it makes the hair supple. Examples include higher alcohols, higher fatty acids, oils and fats, waxes, hydrocarbon oils, alkyl glyceryl ethers, ester oils, and silicone oils.
Further, these oily components may be blended alone or in combination of two or more.

A higher alcohol is a compound having a hydroxyl group as a substituent on a hydrocarbon. The number of hydroxyl groups is not particularly limited, and may be a polyhydric alcohol having a plurality of hydroxyl groups, but preferably a monohydric alcohol. Further, it may have a substituent other than a hydroxyl group.
Further, the hydrocarbon may be either a saturated hydrocarbon or an unsaturated hydrocarbon.

The number of carbon atoms in the higher alcohol is not particularly limited. For example, the higher alcohol preferably has 8 to 40 carbon atoms. The lower limit is more preferably 10 or more, still more preferably 12 or more, particularly preferably 14 or more, and even more preferably 16 or more. The upper limit is more preferably 35 or less, still more preferably 30 or less, particularly preferably 28 or less, and even more preferably 24 or less.

Further, the carbon chain of the higher alcohol may be saturated or unsaturated. Higher alcohols such as 2-octyldodecanol having a branched carbon chain can also be used. In addition, from the viewpoint of emulsion stability, it is preferable that the carbon chain of the higher alcohol is linear.
The number of hydroxyl groups in the higher alcohol is not particularly limited, and a polyhydric alcohol having a plurality of hydroxyl groups may be used. Note that monohydric alcohol is preferred. Further, it may have a substituent other than a hydroxyl group.

Specific examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, arachyl alcohol, behenyl alcohol, 2-hexyldecanol, isostearyl alcohol, 2-octyldodecanol, and decyl. Examples include tetradecanol, oleyl alcohol, linoleyl alcohol, linolenyl alcohol, lanolin alcohol, phytosterol, and cholesterol.
Further, these higher alcohols may be blended alone or in combination of two or more types.

The content of higher alcohol in the oxidative hair dye composition is not particularly limited. For example, the content of higher alcohol is preferably 1.0% by mass or more and 20.0% by mass or less. The lower limit is more preferably 2.0% by mass or more, still more preferably 3.0% by mass or more, particularly preferably 5.0% by mass or more. On the other hand, the upper limit is more preferably 15.0% by mass or less, still more preferably 12.5% by mass or less, particularly preferably 10.0% by mass or less.

Higher fatty acids are fatty acids having 6 or more carbon atoms. The number of carbon atoms in the higher fatty acid is not particularly limited, but is preferably 10 or more and 24 or less, more preferably 12 or more and 16 or less.

Specific examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, oleic acid, undecylenic acid, linoleic acid, ricinoleic acid, and lanolin fatty acids. . Preferable examples include lauric acid, myristic acid, and palmitic acid.
Further, these higher fatty acids may be blended alone or in combination of two or more types.

Specific examples of fats and oils include olive oil, rosehip oil, camellia oil, shea butter, macadamia nut oil, almond oil, tea seed oil, sasanquat 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, adlay oil, grape seed oil, avocado oil, carrot oil, castor oil, linseed oil, coconut oil, mink oil, egg yolk oil , evening primrose oil, etc.

Specific examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, spermaceti wax, rice bran wax, sugar cane wax, palm wax, montan wax, cotton wax, bayberry wax, privet wax, kapok wax, and shellac wax.

Specific examples of hydrocarbon oil include liquid paraffin, paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, mineral oil, synthetic squalane, hydrogenated squalane, squalane, polybutene, polyethylene, microcrystalline wax, vaseline, ozokerite, ceresin. , limonene, turpentine, etc.

Examples of the alkyl glyceryl ether include batyl alcohol, chimyl alcohol, serakyl alcohol, and isostearyl glyceryl ether.

Specific examples of ester oils include diisopropyl adipate, 2-hexyldecyl adipate, isopropyl myristate, myristyl myristate, octyldodecyl myristate, myristyl myristate, isotridecyl myristate, cetyl octoate, cetyl isooctanoate. , isononyl isononanoate, diisopropyl sebacate, isopropyl palmitate, 2-ethylhexyl palmitate, cetyl ethylhexanoate, butyl stearate, stearyl stearate, isocetyl isostearate, hexyl laurate, decyl oleate, fatty acid (C10- 30) (cholesteryl/lanosteryl), lauryl lactate, octyldodecyl lactate, octyldodecyl ricinoleate, cetyl lactate, lanolin acetate, pentaerythritol fatty acid ester, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, cetyl caprate, tricapryl Examples include glyceryl acid, diisostearyl malate, dioctyl succinate, and hydrogenated castor oil isostearate.

Specific examples of silicone oil include dimethylpolysiloxane (dimethicone), dimethylpolysiloxane (dimethiconol) having a hydroxy end group, methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, polyether-modified silicone , highly polymerized silicones with an average degree of polymerization of 650 to 10,000, amino-modified silicones, betaine-modified silicones, alkyl-modified silicones, alkoxy-modified silicones, mercapto-modified silicones, carboxy-modified silicones, fluorine-modified silicones, and the like.

Specific examples of the above amino-modified silicones include aminopropylmethylsiloxane/dimethylsiloxane copolymer (aminopropyl dimethicone), aminoethylaminopropylsiloxane/dimethylsiloxane copolymer (amodimethicone), aminoethylaminopropylmethyl Examples include siloxane/dimethylsiloxane copolymer (trimethylsilyl amodimethicone).

The total content of oily components in the oxidative hair dye composition is not particularly limited. For example, the total content of oily components is preferably 0.01% by mass or more and 60.0% by mass or less. The lower limit is more preferably 0.1% by mass or more, still more preferably 1.0% by mass or more, particularly preferably 2.0% by mass or more. On the other hand, the upper limit is more preferably 40.0% by mass or less, still more preferably 20.0% by mass or less, particularly preferably 10.0% by mass or less.

(Water-soluble polymer compound)
The water-soluble polymer compound improves the viscosity of the first and second agents and the condition of the hair. For example, cationized cellulose derivatives such as hydroxyethylcellulose dimethyldiallyl ammonium chloride, cationic starch, cationized guar gum, polymers or copolymers of diallyl quaternary ammonium salts, quaternized polyvinylpyrrolidone, acrylamide/acrylic acid/dimethyldiallyl chloride Examples include amphoteric polymer compounds such as ammonium copolymers. These water-soluble polymer compounds may be blended alone or in combination of two or more.

The content of the water-soluble polymer compound in the oxidative hair dye composition is not particularly limited. For example, the content of the water-soluble polymer compound is preferably 0.01% by mass or more and 20.0% by mass or less. The lower limit is more preferably 0.1% by mass or more, still more preferably 1.0% by mass or more. On the other hand, the upper limit is more preferably 10.0% by mass or less, still more preferably 5.0% by mass or less.

(Polyhydric alcohol)
A polyhydric alcohol is an alcohol having two or more hydroxyl groups, and includes, for example, glycol and glycerin.
Moreover, these polyhydric alcohols may be blended alone or in combination of two or more types.

Specific examples of glycol include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (eg, PEG400, PEG1000, PEG1500, PEG1540, etc.), propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,3- Examples include butylene glycol. Specific examples of glycerin include glycerin, diglycerin, polyglycerin, and the like.

The content of polyhydric alcohol in the oxidative hair dye composition is not particularly limited. For example, the content of polyhydric alcohol is preferably 0.1% by mass or more and 30.0% by mass or less. The lower limit is more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, particularly preferably 2.0% by mass or more. On the other hand, the upper limit is more preferably 20.0% by mass or less, still more preferably 15.0% by mass or less, particularly preferably 10.0% by mass or less.

(chelating agent)
The chelating agent is not particularly limited as long as it improves deep dyeing properties. For example, ethylenediaminetetraacetic acid (EDTA, edetic acid), ethylenediaminehydroxyethyltriacetic acid trisodium dihydrate (hydroxyethylethylenediaminetriacetic acid trisodium, HEDTA) and its salts, diethylenetriaminepentaacetic acid and its salts, and hydroxyethane diphosphonic acid. (HEDP, etidronic acid) and its salts.
Further, these chelating agents may be blended alone or in combination of two or more.

The oxidative hair dye composition also contains antioxidants (e.g., ascorbic acid (L-ascorbic acid), anhydrous sodium sulfite, etc.), preservatives (e.g., phenoxyethanol, sodium benzoate, etc.), and organic solvents (e.g., phenoxyethanol, sodium benzoate, etc.). ethanol, etc.), peptides (e.g., collagen, keratin, etc.), sugars (e.g., sorbitol, maltose, etc.), stabilizers (e.g., phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, etc.), tannic acid, etc.), inorganic salts (e.g., sodium chloride, sodium carbonate, etc.), buffering agents (e.g., sodium phosphate), plant extracts, crude drug extracts, vitamins, amino acids, fragrances, and ultraviolet absorbers; At least one type selected from those listed in "Special Standards for Foreign Materials" (published in June 2006, published by Yakuji Nipposha) may be included.

<Ingredients included in the second agent>
(Oxidant)
The oxidizing agent is not particularly limited as long as it has the effect of oxidizing the oxidative dye to develop color and the effect of decomposing melanin inside the hair. For example, oxidizing agents include hydrogen peroxide, potassium bromate, sodium bromate, urea peroxide, melamine peroxide, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide. , sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, persulfates such as ammonium persulfate, potassium persulfate, and sodium persulfate, hydrogen peroxide adducts of sulfates, and peroxides of phosphates. Examples include hydrogen adducts, hydrogen peroxide adducts of pyrophosphate, peracetic acid, performic acid, peracetates, performates, permanganates, and bromates. Among these oxidizing agents, hydrogen peroxide is preferred because it has excellent decolorizing power for melanin.
Further, these oxidizing agents may be blended alone or in combination of two or more.

In addition, when containing hydrogen peroxide as an oxidizing agent, hydroxyl such as ethylene glycol phenyl ether (phenoxyethanol), tetrasodium hydroxyethane diphosphonate, and disodium hydroxyethane diphosphonate can be used as a stabilizer to improve its stability. A stannate salt such as ethanediphosphonic acid tetrasodium salt, sodium stannate, potassium stannate, etc. may be blended.

The content of the oxidizing agent in the oxidizing agent-containing composition is not particularly limited. For example, the content of the oxidizing agent in the oxidative hair dye composition is preferably 0.05% by mass or more and 30.0% by mass or less. The lower limit is more preferably 0.1% by mass or more, still more preferably 0.3% by mass or more, particularly preferably 0.5% by mass or more. On the other hand, the upper limit is more preferably 20.0% by mass or less, still more preferably 15.0% by mass or less, particularly preferably 10.0% by mass or less.

Further, the second part may contain other components other than the oxidizing agent as needed, and the other components other than the oxidizing agent may include components that can be blended into the first part.

[How to use oxidized hair dye composition]
The method of using the oxidative hair dye composition of the present invention is not particularly limited, but preferably a first agent containing an oxidizing dye and a second agent containing an oxidizing agent can be used in combination.
The oxidative hair dye composition is typically a two-component composition consisting of a first agent and a second agent, but may be a multi-component composition consisting of three or more agents.

The oxidative hair dye composition of the present invention can be used by applying it to the already dyed part of the hair that has been dyed and a certain period of time has passed, and to the newly grown part of the hair that has grown after the previous hair dyeing process. Alternatively, it may be applied only to the dyed areas of the hair, and any oxidative hair dye composition may be applied to the new areas.

The alkalinity of the oxidative hair dye composition after mixing the first agent and the second agent is 3.0 ml/g or less. By setting the alkalinity of the oxidative hair dye composition within the above range, it is possible to reduce the influence of pH reduction due to acidic components remaining inside hair that has been repeatedly treated with the oxidative hair dye composition, thereby reducing the effect on the hair. The effect of the present invention, which suppresses damage and exhibits an excellent hair dyeing effect regardless of the condition of the hair, is further exhibited.

The pH of the oxidative hair dye composition after mixing the first agent and the second agent is 8.5 to 9.5. By setting the pH of the oxidative hair dye composition within the above range, the effect of the present invention, which suppresses damage to hair and exhibits excellent hair dyeing action regardless of the condition of the hair, is more effectively achieved.

The dosage form of each agent may be in any form and is appropriately designed in consideration of mixability, applicability, etc. Examples include liquid, cream, and gel forms. In addition, in the case of a one-bath type, the oxidative hair dye composition after mixing each agent may be in a form that has applicability such as liquid, cream, or gel. It may also contain solid or solid forms. Moreover, the dosage form at the time of application may be foamy or mist-like. In the case of foaming, an aerosol former container, a non-aerosol foamer container, a shaking container, etc. may be used. When making it into a mist, a sprayer may be used.

The hair dyeing method of the present invention can be used to dye body hair such as human hair, beards, eyebrows, and shin hair. In addition, it may be used to dye the hair of animals such as pets. In particular, it is preferable to use it for dyeing already dyed areas.

The usage mode of the first agent and the second agent is to mix the first agent and the second agent before or at the time of application to the hair. Specifically, examples include those in which the first and second agents are mixed in a container, and those in which the first and second agents are taken up with a comb and applied to the hair at the same time and mixed on the hair. .
In mixing the first agent and the second agent, preparation tools may be used, such as containers such as cups, plates, bottles, and trays, and stirring tools such as brushes, toothbrushes, and stirring rods. Alternatively, the first agent and the second agent may be mixed by shaking using a shaking container. The preparation tool is appropriately selected depending on the viscosity of the mixture of the first agent and the second agent. Note that even in the case of a multi-drug system consisting of three or more agents, a third agent such as a thickener can be mixed together with the first and second agents.
In addition, "shaking" is an operation that causes the agent containing the first agent and the second agent to flow, more preferably a random flow such as turbulent flow or convection. An example of this is holding it in your hand and shaking it.

The means for applying the mixture of the first agent and the second agent to the hair is not particularly limited, but for example, the mixture of the first agent and the second agent is applied to the hair using an applicator such as a comb, a brush, or a brush. Or it can be applied. Alternatively, the mixture of the first agent and the second agent may be attached or applied to the hair using gloved hands.

The mixture of the first agent and the second agent applied to the hair is left for a predetermined time in order to oxidize the oxidative dye that has penetrated into the hair and develop color. The leaving time is appropriately designed depending on the type of oxidizing dye, the concentration of the oxidizing agent, etc., but is preferably 1 to 60 minutes. The lower limit is more preferably 3 minutes or more, particularly preferably 5 minutes or more. The upper limit is more preferably 45 minutes or less, particularly preferably 30 minutes or less.

Furthermore, when washing away the mixture of the first and second agents applied to the hair and left, examples include a method of rinsing with water, hot water, etc., and a method of washing with a detergent such as shampoo. The hair may also be further treated with treatments, conditioners, and the like.

EXAMPLES The present invention will be specifically explained below with reference to Examples, but the technical scope of the present invention is not limited by these Examples.

(Composition of each agent)
A first agent containing each component shown in Table 1 and a second agent containing each component shown in Table 2 were prepared. In addition, the numerical value in the column showing each component in each table shows the content of the component in the column, and the unit is mass %. The notations "(A)" to "(C)" in the table indicate compounds corresponding to each of the components (A) to (C) described in the claims and specification of the present application. In addition, the notations "(B')" and "(C')" in the table indicate compounds that are not included in component (B) and component (C), respectively.

(Feel evaluation)
An oxidative hair dye composition was prepared by mixing the first agent and the second agent at a ratio of 1:1. An oxidative hair dye in an amount equal to the weight of the hair bundle was applied with a brush to a dry hair bundle (white hair bundle (30 cm) manufactured by Beaulux), and the mixture was left at 30° C. for 30 minutes. After being left to stand, the hair bundle was washed with water and then with shampoo to wash away the oxidative hair dye composition. Next, conditioner was applied to the hair strands. After rinsing the hair strands and rinsing off the conditioner, the moisture from the hair strands was wiped off with a towel, and finally, the hair strands were dried with a hair dryer.
The feel was evaluated by 10 expert panelists who touched the treated hair tresses with their hands to check the feel of the hair and gave a rating of good or bad. If the number of panelists who judged it as good is 8 or more, it is marked as "◎", when it is 5 to 7, it is marked as "○", when it is 2 to 4, it is marked as "△", and when it is 1 or less, it is marked as "◎". The feel was evaluated as "x".

(Evaluation of pH variability)
A mixed solution was prepared by dissolving 3 g of the first agent and 3 g of the second agent in 50 g of water, and the pH was measured. 0.4 ml of 0.1N hydrochloric acid was added dropwise to the mixed solution, and the pH of the solution was measured. Based on the pH values of the mixed solution before and after the hydrochloric acid addition treatment, pH variability was evaluated using the following criteria.
Note that the pH was measured using a pH meter (pH-METER F-52, manufactured by Horiba, Ltd.).
◎: pH fluctuation range is within 0.4 ○: pH fluctuation range is more than 0.4 and less than 0.7 △: pH fluctuation range is more than 0.7 and less than 2.0 ×: pH fluctuation Range with a width of 2.0 or more

In Table 1, when comparing Examples 1 to 3 and Comparative Examples 1 and 2, it is found that when the alkalinity at the time of use is 2.3 ml/g or less and the pH at the time of use is 9.0, the oxidation of Examples 1 to 3 is In Comparative Example 1, which does not contain the component (B) contained in the hair dye, and Comparative Example 2, which does not contain the component (C) contained in the oxidized hair dyes of Examples 1 to 3, the pH fluctuation was It was found that it increases.
In Table 1, when Examples 1 to 3 and Comparative Example 3 are compared, the alkalinity at the time of use is 3.9 ml/g and the alkalinity at the time of use is 3.9 ml/g and It has been found that when the pH value is as high as 9.7, the feel is reduced. Further, it was found from Comparative Example 4 that this decrease in feel was not improved even if the pH during use was maintained at 9.0.

From the above results, we found that by blending components (A) to (C) into an oxidative hair dye composition, the alkalinity at the time of use is 3.0 ml/g or less and the pH at the time of use is 8.5 or more and 9.5. It has been shown that the range of pH change can be suppressed without deteriorating the feel of the hair by using the following conditions. As a result, it has been revealed that the oxidative hair dye composition suppresses damage to hair and improves the hair dyeing effect.

The present invention provides an oxidative hair dye composition that suppresses damage to hair and exhibits the desired hair dyeing effect regardless of the condition of the hair, and a method for using the same on dyed areas.
The oxidative hair dye composition of the present invention can be used as a hair dye for dyeing body hair such as human hair, beards, eyebrows, and shin hair. In addition, it may be used as a hair dye for dyeing the body hair of animals such as pets. The oxidative hair dye composition of the present invention is particularly preferably used as a hair dye for dyed areas.
Furthermore, the oxidative hair dye composition of the present invention can be used for coloring in beauty salons, barber shops, etc., or for self-coloring.

Claims (5)

An oxidative hair dye composition containing a first agent containing an oxidizing dye and a second agent containing an oxidizing agent, which contains the following components (A), (B), and (C), and has an alkalinity. An oxidative hair dye composition characterized by having a pH of 3.0 ml/g or less, a pH of 8.5 to 9.5, and a content of (A) below 0.28% by mass or less .
(A) An alkaline agent selected from ammonia and/or alkanolamines (B) Oxidation dyes to which sulfate or hydrochloride has been added (excluding orthochloroparaphenylenediamine sulfate)
(C) Ammonium salt The oxidative hair dye composition according to claim 1, wherein the total content (B) + (C) of the component (B) and the component (C) is 0.65% by mass or more. . Furthermore, the ratio (A)/((B)+(C)) of the content of the (A) component to the total content of the (B) component and the (C) component is 0.5 or less. The oxidative hair dye composition according to claim 1 or 2, characterized in that: The oxidative hair dye composition according to any one of claims 1 to 3, wherein the component (C) is an ammonium salt of a strong acid. A method for dyeing hair, comprising using the oxidative hair dye composition according to any one of claims 1 to 4 on previously dyed areas of hair.