JP2022054740A - Aqueous composition - Google Patents

Abstract

To provide a basic formulation of a shampoo agent that can prevent low viscosity at the preparation of a second agent caused by the blending of an acid and an oxidizer in an oxidative hair dye of shampoo type or the like and a temporal decrease in the viscosity.SOLUTION: An aqueous composition contains the following components (a)-(d) and is mixed with a composition containing an alkali agent: (a) an oxidizer, (b) an acid, (c) an anionic surfactant and (d) an ampholytic surfactant.SELECTED DRAWING: None

Description

The present invention relates to an aqueous composition, and more particularly to an aqueous composition capable of achieving a suitable viscosity under the compounding of an acid and an oxidizing agent and maintaining the viscosity over time. This aqueous composition is preferably used as, for example, a shampoo-type oxidative hair dye, a hair bleaching agent, and a second agent of a hair bleaching agent. Hereinafter, the term "oxidative hair dye, etc." is a general term for oxidative hair dyes, hair bleaching agents, and hair bleaching agents.

There is provided a hair cosmetic that should be called a shampoo hair color in which an active ingredient such as an oxidative hair dye is added to the basic composition of a shampoo agent. According to such a hair cosmetic, the effect of hair dyeing or bleaching / bleaching with an oxidative hair dye or the like can also be obtained in a daily shampoo operation. For use, for example, non-permeable thin gloves or the like can be worn.

Patent Document 1 relates to an oxidative hair dye, wherein the first agent contains an alkaline agent, an oxidative dye, an anionic surfactant, an amphoteric surfactant and a nonionic surfactant, and the second agent is an oxidant and an acid (hydroxyl). Ethanediphosphonic acid), anionic surfactant and nonionic surfactant. From the viewpoint of applicability to hair, we invented the prevention of viscosity reduction and sagging of the oxidative hair dye (mixture of the first agent and the second agent) due to the high content of the oxidative dye (1 to 20% by mass). It is an issue of. It is described that the thickening polymer can be blended with the second agent, but the viscosity of the second agent and the maintenance of the viscosity are not taught.

Patent Document 2 relates to an oxidative hair dye or a hair bleaching agent, wherein the first agent contains an alkaline agent, an amphoteric surfactant and / or an anionic surfactant, and the second agent is an oxidant, an acid and a nonionic surfactant. Contains an agent. Further, as in Patent Document 1, from the viewpoint of applicability to hair, maintaining the viscosity of the oxidative hair dye (mixture of the first agent and the second agent) and preventing dripping are the subjects of the invention. It should be noted that the possibility of blending a thickening polymer with the second agent and the viscosity of the second agent are described, but the maintenance of the viscosity of the second agent is not taught.

Japanese Unexamined Patent Publication No. 2016-08891 Japanese Patent No. 5919039

As seen in Patent Documents 1 and 2, various attempts have been made conventionally to maintain the viscosity of the oxidative hair dye and the like and prevent dripping.
However, in the shampoo type oxidative hair dye, there is a peculiar situation that the active ingredient of the hair color is added to the basic composition of the shampoo agent. The technical significance of the required viscosity for hair applicability in a normal oxidative hair dye and the required viscosity as a shampoo in a shampoo type oxidative hair dye are different. Such a situation is the same even when the active ingredient of the hair bleaching agent or the hair bleaching agent is added to the basic formulation of the shampoo agent. Therefore, it is necessary to newly develop a basic formulation of shampoo agents corresponding to shampoo type oxidative hair dyes and the like.

By the way, various inorganic acids and organic acids are blended in the second agent such as an oxidative hair dye for the purpose of stabilizing hydrogen peroxide and neutralizing the alkaline agent of the first agent. The organic acid hydroxyethanediphosphonic acid (HEDP) and its salts are also used as chelating agents. These acids reduce the viscosity of the second agent. Further, the oxidant compounded in the second agent such as an oxidative hair dye also contributes to lowering the viscosity of the second agent.

Therefore, the present invention, as part of the development of a basic shampoo formulation for shampoo-type oxidative hair dyes and the like, reduces the viscosity of the second agent due to the formulation of an acid and an oxidant, and reduces the viscosity over time. The purpose is to provide a basic formulation of shampoo that can be prevented.

(Structure of the First Invention)
The first invention of the present application for solving the above-mentioned problems is an aqueous composition containing the following components (a) to (d) and used by mixing with a composition containing an alkaline agent.

(A) Oxidizing agent (b) Acid (c) Anionic surfactant (d) Amphoteric surfactant (Construction of the second invention)
In the second invention of the present application for solving the above-mentioned problems, the component (c) of the aqueous composition according to the first invention is an anionic surfactant having a lauryl group.

(Structure of the Third Invention)
In the third invention of the present application for solving the above-mentioned problems, the content of the component (c) of the aqueous composition according to the first invention or the second invention is 3.0% by mass or more.

(Structure of the Fourth Invention)
In the fourth invention of the present application for solving the above problems, the content of the component (d) of the aqueous composition according to any one of the first to third inventions is 3.5% by mass or more.

(Structure of the fifth invention)
In the fifth invention of the present application for solving the above problems, the mass ratio of the content of the component (c) to the content of the component (d) in the aqueous composition according to any one of the first to fourth inventions ( c) / (d) is in the range of 0.35 to 1.50.

(Effect of the first invention)
The second agent of the oxidative hair dye, the hair bleaching agent, and the hair bleaching agent contains an oxidizing agent such as hydrogen peroxide as an essential component. Further, various kinds of inorganic acids and organic acids are blended for the purpose of stabilizing the hydrogen peroxide and neutralizing the alkaline agent when mixed with the first agent containing the alkaline agent. Further, hydroxyethanediphosphonic acid (HEDP) and the like, which are often blended in the second agent as a chelating agent, are also organic acids.

The second agent containing these oxidizing agents and acids has a low viscosity at the time of preparation when combined with a surfactant used in a general shampoo when preparing as a shampoo-type oxidative hair dye or the like. If a thickener such as a polymer compound is added to increase the viscosity of this problem, the viscosity of the product decreases with time during storage.

The inventor of the present application is a second agent such as an oxidative hair dye, and a water-based composition used by mixing with a composition containing an alkaline agent includes (c) anionic surfactant and (d) amphoteric surfactant. It has been found that when the aqueous composition is prepared, low viscosity and a decrease in viscosity with time can be effectively prevented.

The reason for obtaining such an effect is that when the aqueous composition contains (c) an anionic surfactant and (d) an amphoteric surfactant in combination, particularly, the anionic interface in which the component (c) has a lauryl group. This is because it is an activator, and when both components (c) and (d) have a specific content ratio, both components form a complex having a stable structure with respect to an acid and / or an oxidizing agent. ..

(Effect of the second invention)
(C) The type of the anionic surfactant is not limited, but the anionic surfactant having a lauryl group, which is a linear alkyl chain having 12 carbon atoms, has a low viscosity and a decrease in viscosity with time during preparation of the aqueous composition. It is particularly preferable in terms of prevention.

(Effect of the Third Invention)
The content of the component (c) in the water-based composition is not limited, but it is particularly preferable that the content is 3.0% by mass or more in order to prevent low viscosity and a decrease in viscosity with time during preparation of the water-based composition.

(Effect of the Fourth Invention)
The content of the component (d) in the water-based composition is not limited, but 3.5% by mass or more is particularly preferable in order to prevent low viscosity and a decrease in viscosity with time during preparation of the water-based composition.

(Effect of the fifth invention)
The mass ratio (c) / (d) of the content of the component (c) to the content of the component (d) in the water-based composition is not limited, but is in the range of 0.35 to 1.50. This is particularly preferable in terms of preventing low viscosity and a decrease in viscosity over time when preparing the composition.

Hereinafter, embodiments of the present invention will be described including the best embodiments thereof. The technical scope of the present invention is not limited by the following embodiments.
[Aqueous composition]
In the present invention, the aqueous composition is a water-based composition, and includes at least an aqueous solution and an aqueous gel. Aqueous gel-like aqueous compositions are particularly preferred. Compositions in which water-insoluble or sparingly soluble components are emulsified are not included.

The aqueous composition of the present invention may be in the form of foam or mist when used together with the first agent. In the case of foaming, an aerosol former container or a non-aerosol former container may be used.

Further, the shampoo-type oxidative hair dye or the like using the aqueous composition of the present invention as the second agent may be a multi-agent type of three or more agents. The multi-agent type oxidative hair dye and the like can be configured by using a component in the first agent such as the oxidative hair dye as a separate agent. For example, in the three-agent hair dye, the first agent containing the alkaline agent and the oxidative dye, the second agent which is the aqueous composition of the present invention, and the alkaline agent and the oxidative dye were removed from the first agent. It is composed of a third agent having a composition.

The aqueous composition is based on water as a precondition and also contains the components (a) to (d) as essential components. Since the component (a) is an oxidizing agent, typical examples of the aqueous composition include second agents such as an oxidative hair dye, a hair bleaching agent, and a hair bleaching agent.

The oxidative hair dye is a mixture of a first agent containing an alkaline agent and an oxidative dye and a second agent containing an oxidant, and the oxidative dye is colored by the oxidant to dye the hair. The alkaline agent has the effect of swelling the hair and promoting the penetration of the dye and the oxidant, and the oxidant has the effect of oxidizing the oxidative dye and also having the effect of decomposing the melanin inside the hair. There is.

The hair bleaching agent and the hair bleaching agent do not contain an oxidative dye in the first agent and bleach the hair. The hair bleaching agent decolorizes the hair by oxidatively decomposing the melanin in the hair, and the hair decoloring agent decolorizes the dye and melanin from the dyed hair.

The pH of the aqueous composition is not particularly limited, but is preferably pH 1 to 6, more preferably pH 1.5 to 5.5, and even more preferably pH 1.5 to 5.5 at 25 ° C. when dissolved in water at a concentration of 10% by mass. The pH is 2 to 5.2, and particularly preferably pH 2.5 to 5.

[(A) Oxidizing agent]
The oxidant has an action of oxidizing an oxidative dye to develop a color and an action of decomposing melanin inside the hair. Specifically, for example, hydrogen peroxide, urea peroxide, melamine peroxide, sodium percarbonate, potassium percarbonate, sodium perborate, potassium perborate, ammonium persulfate, potassium persulfate, sodium persulfate and the like. Sulfate, sodium peroxide, potassium peroxide, magnesium peroxide, barium peroxide, calcium peroxide, strontium peroxide, hydrogen peroxide adduct of sulfate, hydrogen peroxide adduct of phosphate, pyrophosphate Examples thereof include hydrogen peroxide adduct, peracetic acid and its salt, pergic acid and its salt, permanganate, bromine salt and the like. Among these, hydrogen peroxide is preferable. When the water-based composition is the second agent of the hair decontamination agent, persulfate such as ammonium persulfate, potassium persulfate and sodium persulfate may be contained as an oxidation aid.

The content of the (a) oxidizing agent in the aqueous composition is not particularly limited, but the lower limit is preferably 0.1% by mass, more preferably 2% by mass from the viewpoint of hair dyeing power, decontamination / decolorization performance, and the like. It is particularly preferably 3% by mass, and the upper limit is preferably 15% by mass, more preferably 9% by mass, and particularly preferably 6% by mass from the viewpoint of suppressing hair damage and the like.

When the aqueous composition contains hydrogen peroxide as an oxidizing agent, it is preferable to add ethylene glycol phenyl ether (phenoxyethanol), hydroxyethanediphosphonic acid or a salt thereof or the like as a stabilizer for improving the stability thereof.

[(B) Acid]
The acid has an effect of neutralizing the alkaline agent when mixed with the first agent of the aqueous composition, and for example, phosphoric acids such as phosphoric acid and pyrophosphate, inorganic acids such as hydrochloric acid, sulfuric acid and nitrate, and citrus. Organic acids such as acid, acetic acid, tartaric acid, lactic acid, malic acid, glycolic acid, levulinic acid, gluconic acid, aspartic acid, glutamic acid, hydroxyethandiphosphonic acid and ascorbic acid. Preferred are phosphoric acids, citric acids and the like having a valence of trivalent or higher, more preferably phosphoric acids or organic acids, and particularly preferably phosphoric acid, citric acid or hydroxyethanediphosphonic acid.

By containing a trivalent or higher acid, the feel of hair, fading resistance, emulsification stability, and application operability can be improved. Further, it also has the effect of suppressing the change in color tone due to the addition of acid.

The content of the acid in the aqueous composition is not particularly limited, but the lower limit is preferably 0.01% by mass, more preferably 0.05% by mass, and particularly preferably 0.1% by mass.
Further, the upper limit of the acid content is not particularly limited, but is preferably 1.0% by mass, more preferably 0.5% by mass, and particularly preferably 0.5% by mass from the viewpoint of stability of the aqueous composition and the like. It is 0.3% by mass. By setting the acid content to 1.0% by mass or less, the stability of the aqueous composition and the performance as a hair treatment agent such as hair dyeing power and coating operability can be improved.

[(C) Anionic surfactant]
As anionic surfactants, alkyl ether sulfate, POE alkyl ether sulfate, alkyl sulfate, alkenyl ether sulfate, alkenyl sulfate, olefin sulfonate, alkane sulfonate, saturated or unsaturated fatty acid salt, alkyl or Examples thereof include alkenyl ether carboxylate, α-sulfosulfate salt, N-acylamino acid type surfactant, phosphoric acid mono or diester type surfactant, sulfosuccinic acid ester and higher fatty acid. The counterion of the anion group of these surfactants may be, for example, sodium ion, potassium ion, or triethanolamine.

Specifically, sodium lauryl sulfate, sodium myristyl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium POE lauryl ether sulfate, POE lauryl ether sulfate triethanolamine, POE lauryl Amdium ether sulfate, POE stearyl ether sulfate sodium, stearoyl methyl taurine sodium, dodecylbenzene sulfonate triethanolamine, sodium tetradecyl sulfonate, sodium lauryl phosphate, POE lauryl ether phosphate and its salts, N-lauroyl glutamates (lauroyl glutamate) (Sodium, etc.), N-lauroylmethyl-β-alanine salt, N-acylglycine salt, N-acylglutamate salt, higher fatty acids lauric acid, myristic acid, and salts of these higher fatty acids are exemplified. A preferred anionic surfactant is sodium lauryl sulfate.

The content of the anionic surfactant in the aqueous composition is not particularly limited, but is preferably 3.0% by mass or more, more preferably 3.3% by mass or more, still more preferably 4.0% by mass or more. Is. There is no particular restriction on the upper limit of the content of the anionic surfactant, but from the viewpoint of stabilizing the oxidizing agent, it can be, for example, about 6.0% by mass.

[(D) Amphoteric tenside agent]
Examples of the amphoteric tenside include an amino acid type amphoteric tenside agent and a betaine type amphoteric tenside agent.

Examples of the amino acid-type amphoteric surfactant include N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium (Na lauroamphoacetate), alkyldiaminoethylglycine hydrochloride, sodium lauryldiaminoethylglycine, and palm oil fatty acid acyl-N. -Glycin-type amphoteric surfactant such as carboxyethyl-N-hydroxyethylethylenediamine sodium, aminopropionic acid-type amphoteric surfactant such as sodium laurylaminopropionate, sodium laurylaminodipropionate, triethanolamine laurylaminopropionate, etc. Is exemplified.

Specific examples of betaine-type amphoteric surfactants include lauryldimethylaminoacetic acid betaine, coconut oil alkylbetaine, myristyldimethylaminoacetic acid betaine, stearyldimethylbetaine sodium, coconut oil fatty acid amide propyl betaine, palm oil fatty acid amide propyl betaine, and lauric acid. Examples thereof include aminoacetate betaine-type amphoteric surfactants such as amidopropyl betaine, ricinoleic acid amidopropyl betaine, and stearyldihydroxyethyl betaine, and sulfobetaine-type amphoteric surfactants such as lauryl hydroxysulfobetaine. A preferred amphoteric surfactant is betaine lauryldimethylaminoacetate.

The content of the amphoteric tenside agent in the aqueous composition is not particularly limited, but is preferably 3.5% by mass or more, more preferably 4.0% by mass or more, and further preferably 4.5% by mass or more. The upper limit of the content of the amphoteric surfactant is not particularly limited, but from the viewpoint of stabilizing the oxidizing agent, it can be, for example, about 7.0% by mass.

[Mass ratio (c) / (d)]
In relation to the effect of the present invention, the mass ratio (c) / (d) of the content of the component (c) to the content of the component (d) in the aqueous composition is in the range of 0.35 to 1.50. It is preferably in the range of 0.40 to 1.25, more preferably in the range of 0.50 to 1.25, and even more preferably in the range of 0.50 to 1.25.

[Total content (c) + (d)]
In relation to the effect of the present invention, the total "(c) + (d)" of the content of the component (c) and the content of the component (d) in the aqueous composition is 7.5% by mass or more. Is preferable, more preferably 8.5% by mass or more, still more preferably 9.5% by mass or more.

[Arbitrary component in aqueous composition]
In addition to the above-mentioned components (a) to (d), the aqueous composition of the present invention includes various kinds as exemplified below as long as it does not promote the effect of the present invention or inhibit the effect of the present invention. Any ingredient can be blended.

(Cationic surfactant)
Examples of the cationic surfactant include alkyl quaternary ammonium salts such as monoalkyl type, dialkyl type, trialkyl type, benzalkonium type and monoalkyl ether type, as well as various amine salts and benzethonium chloride.

Specifically, lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, lauryltrimethylammonium bromide, behenyltrimethylammonium chloride, dialkyl chloride (12-15) dimethylammonium, dialkyl chloride (12-18) dimethylammonium, dialkyl chloride (14) -18) Examples thereof include dimethylammonium, dicocoyldimethylammonium chloride, disetyldimethylammonium chloride, distearyldimethylammonium chloride, isostearyllauryldimethylammonium chloride and the like.

The content of the cationic surfactant in the aqueous composition is not particularly limited, and can be appropriately selected, for example, in the range of 0.01 to 1.0% by mass. From the viewpoint of enhancing the transparency of the aqueous composition, it is preferably 0.5% by mass or less, and particularly preferably 0.2% by mass or less.

(Nonion surfactant)
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, sorbitan fatty acid esters, and sucrose. Examples thereof include fatty acid esters, alkyl polyglucosides, and fatty acid alkanolamides.

Specific examples of POE alkyl ethers include POE (2) lauryl ether, POE (7) cetyl ether, POE (20) stearyl ether, POE (10) oleyl ether, POE (5) behenyl ether and the like.

Specific examples of the POE sorbitan fatty acid esters include POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan monopalmitate, POE sorbitan monolaurate, and POE sorbitan trioleate.

Specific examples of the POE glycerin fatty acid esters include POE glycerin monostearate, POE glycerin monomyristic acid, and the like.
Specific examples of the sorbitan fatty acid esters include tetraoleic acid POE sorbit, hexastearic acid POE sorbit, monolauric acid POE sorbit, POE sorbitol Mitsurou and the like.

Specific examples of the fatty acid alkanolamides include lauric acid monoethanolamide, stearic acid monoethanolamide, POE lauric acid monoethanolamide, POE coconut oil fatty acid monoethanolamide, and polyoxypropylene myristic acid monoethanolamide. Will be done. These components may be contained alone or in combination of two or more of the specific examples.

The content of the nonionic surfactant in the aqueous composition is not particularly limited, and can be appropriately selected within the range of, for example, 0.01 to 5% by mass.
(Oil component)
Examples of the oily component include higher alcohols, fats and oils, waxes, hydrocarbons, esters, silicone oils and the like.

Examples of higher alcohols include cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, and oleyl alcohol, and examples of fats and oils include olive oil, camellia oil, shea butter, macadamia nut oil, safflower oil, sesame oil, beef fat, cacao fat, and rapeseed. Examples include oil, wheat germ oil, avocado oil, egg yolk oil, examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, and whale wax, and examples of hydrocarbons include liquid paraffin. Paraffin, microcrystallin wax, vaseline, α-olefin oligomer and the like are exemplified, higher fatty acids are exemplified by lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, lanolin fatty acid and the like, and esters include diisopropyl adipate, etc. Examples thereof include isopropyl myristate, myristyl myristate, cetyl octanate, etc. Examples of the silicone oil include dimethylpolysiloxane (INCI name: dimethicone), dimethylpolysiloxane having a hydroxy end group (INCI name: dimethiconol), methylphenylpolysiloxane, and the like. Examples thereof include polyether-modified silicone and amino-modified silicone.

(Other optional ingredients)
In addition to the above optional components, the aqueous composition of the present invention includes preservatives such as sodium benzoate, organic solvents such as ethanol, saccharides such as sorbitol and maltose, and water-soluble polymers such as hydroxyethyl cellulose and carboxyvinyl polymer. Polydimethylmethylene piperidinium solution, cationized water-soluble polymers such as diallyldimethylammonium chloride and hydroxyethyl cellulose, polyhydric alcohols such as polyethylene glycol and dipropylene glycol, ethylenediamine hydroxyethyl trisodium trisodium dihydrate, sodium chloride Inorganic salts such as, pH adjusters such as ammonium hydrogencarbonate, direct dyes, hair growth ingredients, plant extracts, crude drug extracts, amino acids / peptides, ureas, vitamins, fragrances, UV absorbers, etc. may be optionally contained. Can be done.

Examples of the present invention will be described below with corresponding comparative examples. The technical scope of the present invention is not limited by these examples and comparative examples.
[Preparation of Examples and Comparative Examples]
As shown in Tables 1 and 2 at the end, a second agent (that is, an aqueous composition) for oxidative hair dyeing or hair bleaching according to Examples 1 to 5 and Comparative Examples 1 to 4 is always used. Prepared at room temperature according to the method. The dosage form was different in the form of an aqueous gel or an aqueous solution depending on each example, and each example was in the form of an aqueous gel, but each comparative example was in the form of an aqueous solution or an aqueous gel close to an aqueous solution.

It should be noted that the present invention aims at preventing low viscosity and a decrease in viscosity over time in a second agent such as for oxidative hair dyeing containing an acid. Therefore, a detailed description of the first agent for oxidative hair dyeing used in combination with these second agents, and a detailed explanation of an oxidative hair dyeing test or the like in which the first agent and the second agent are mixed and applied to hair. Is omitted. However, there was no problem in the results of the oxidative hair dyeing test and the hair bleaching test in which these second agents were used in combination with the first agent for oxidative hair dyeing and hair bleaching having a general composition, respectively.

In Tables 1 and 2, when the component shown in the component name column corresponds to any of the components (a) to (d) of the present invention, that fact is added to the component symbol column. In addition, the component described as "d ratio" in the column of the component symbol in Table 2 indicates that it is a component for comparison with the component (d). The numerical value indicating the content of each component means the content of the component in the second agent according to each Example or each Comparative Example in units of mass%.

In the actual preparation, a 35% hydrogen peroxide solution was used as hydrogen peroxide and a 60% hydroxyethane diphosphonic acid solution was used as the hydroxyethane diphosphonic acid. In Tables 1 and 2, the pure components of both of these components are used. (Net compounding amount) is shown.

The items described as "c + d" in Tables 1 and 2 indicate the total content of the component (c) and the component (d) in the second agent according to each Example or each comparative example in mass% units. The term "c / d" also indicates the mass ratio (c) / (d) of the content of the component (c) to the content of the component (d).

[Evaluation of Examples and Comparative Examples]
Viscosity was measured immediately after preparation using a part of the second agent according to each Example and each Comparative Example shown in Tables 1 and 2. Use a VISCOMETER TV-10 viscometer (manufactured by Toki Sangyo Co., Ltd.) to measure the viscosity. It was measured under the conditions of. When the viscosity was 10,000 mPa · s or more and less than 50,000 mPa · s, the measurement was carried out under the conditions of 25 ° C. for 1 minute, rotation speed: 12 rpm, and the use of a No. 4 rotor. These measured values are shown in the section of "(1) Room temperature / same day" in the column of "Viscosity value (actual measurement)" in Tables 1 and 2. The unit of the numerical value is mPa · s.

Next, the other part of the second agent according to each Example and each Comparative Example was stored at 25 ° C. for 24 hours after preparation, and then the viscosity was measured under the same measurement conditions. These measured values are shown in the section "(2) Room temperature, 1 day later" in the column of "Viscosity value (actual measurement)" in Tables 1 and 2. The unit of the numerical value is mPa · s.

Next, after further another part of the second agent according to each Example and each Comparative Example was stored at 60 ° C. for 24 hours after preparation, the viscosity was measured under the same measurement conditions. These measured values are shown in the section "(3) 60 ° C. 1 day later" in the column of "viscosity value (actual measurement)" in Tables 1 and 2. The unit of the numerical value is mPa · s.

In each of the comparative examples shown in Table 2, the measured values of the above three items are all indicated as "-", which means that the second agent according to each comparative example has a low viscosity equivalent to that of purified water. It indicates that the viscosity could not be measured because it was present.

The columns of "(3) / (2)" in Table 1 are parameters that are indicators of the decrease in viscosity of the second agent over time, and are "(3) 60" with respect to the viscosity value of "(2) Room temperature, 1 day later". The ratio of the viscosity value of "° C. 1 day later" is expressed as a percentage.

[Evaluation criteria for Examples and Comparative Examples]
The "viscosity evaluation" in Tables 1 and 2, that is, the evaluation criteria that the viscosity of the second agent immediately after adjustment is not low, is the highest rank when the above "(1) Room temperature / day" is 10,000 mPa · s or more. If it is 5000 mPa · s or more and less than 10000 mPa · s, it will be ranked "4", and if it is 3000 mPa · s or more and less than 5000 mPa · s, it will be ranked "3", 2000 mPa · s. When it was s or more and less than 3000 mPa · s, it was given a rank of "2", and when it was less than 2000 mPa · s, it was given a lowest rank of "1". This evaluation rank is shown in the "Viscosity evaluation" column of Tables 1 and 2.

The evaluation criteria for "viscosity stability", that is, the decrease in viscosity of the second agent over time is the highest rank when the numerical value in the above "(3) / (2)" column is 95 or more. 5 ”, below, 80 or more and less than 95 is ranked“ 4 ”, 45 or more and less than 80 is ranked“ 3 ”, and 20 or more and less than 45 is ranked“ 2 ”. , When it is less than 20, the lowest rank is "1". This evaluation rank is shown in the "Viscosity stability" column of Tables 1 and 2.

According to the present invention, there is provided a low viscosity of a second agent such as an oxidative hair dye due to the combination of an acid and an oxidizing agent, and a basic composition of a shampoo agent capable of preventing the viscosity from decreasing with time.

Claims (5)

An aqueous composition containing the following components (a) to (d) and used by mixing with a composition containing an alkaline agent.
(A) Oxidizing agent (b) Acid (c) Anionic surfactant (d) Amphoteric surfactant The aqueous composition according to claim 1, wherein the component (c) is an anionic surfactant having a lauryl group. The aqueous composition according to claim 1 or 2, wherein the content of the component (c) is 3.0% by mass or more. The aqueous composition according to any one of claims 1 to 3, wherein the content of the component (d) is 3.5% by mass or more. Any one of claims 1 to 4, wherein the mass ratio (c) / (d) of the content of the component (c) to the content of the component (d) is in the range of 0.35 to 1.50. The aqueous composition according to the section.