JP7624027B2 - Second agent composition of aerosol type hair dye or hair bleach - Google Patents

Description

The present invention relates to a second agent composition for an aerosol type hair dye or hair bleach.

Conventionally, a two-component aerosol hair dye or hair bleach is known, which consists of a first agent containing an alkaline agent and a second agent containing an oxidizing agent, the first agent and the second agent being stored in separate aerosol containers, and which are ejected and mixed when used (Patent Documents 1 and 2).

It is generally known that in the manufacture of such two-drug aerosol products, high shear forces are applied to the agents when they are filled into the aerosol container and when they are ejected from the aerosol container.

JP 2000-297018 A JP 2004-091359 A

However, the shear forces applied to the agent during filling and dispensing are so strong that they can change the emulsion structure of the agent, causing the viscosity of the agent to become lower than initially set when used. This decrease in viscosity of the agent can cause a change in the amount of agent dispensed from the aerosol container. In particular, in two-agent aerosol hair dyes or hair bleaches, the above-mentioned viscosity changes can cause the amount of the first agent dispensed from the first agent container to differ significantly from the amount of the second agent dispensed from the second agent container, making it impossible to achieve a stable hair dyeing/bleaching effect.

In addition, when using hydrogen peroxide and a cationic surfactant (often with a chloride ion as the counter ion) in the second agent of an aerosol hair dye/bleach, there is a risk of corrosion of the metal container, and in order to prevent this, it is necessary to select an inner bag or inner coating for the metal container, which requires a great deal of effort. In addition, there is a problem that using an anionic surfactant in the second agent can cause a deterioration in the feel of the hair and can decompose at low pH, making it difficult to use an ionic surfactant.

The present invention relates to a second agent composition that uses as little ionic surfactant as possible, and maintains a constant viscosity from before the agent is filled into the aerosol container until it is discharged from the aerosol container, thereby realizing stable discharge of the agent from the aerosol container and providing a stable hair dyeing/bleaching effect.

After extensive research, the inventors have discovered that in the second agent of an aerosol type hair dye or hair bleach, in order to maintain a constant viscosity of the agent without using as much ionic surfactant as possible, it is sufficient to reduce the emulsion particle size, and further that, for this purpose, it is effective to blend a nonionic surfactant, a higher alcohol, and a hydrocarbon in a specific ratio.

The present invention provides an aerosol type second-agent composition for hair dyeing or hair bleaching, which is used by mixing with a first-agent composition containing an alkaline agent, the second-agent composition for aerosol type hair dyeing or hair bleaching comprising the following components (A) to (D), in which the mass ratio of the total of components (C) and (D) to component (B), [(C)+(D)]/(B), is 1.0 or more and 3.5 or less, and the mass ratio of component (D) to component (C), (D)/(C), is 1.2 or more and 2.2 or less.
(A) Hydrogen peroxide
(B) Nonionic surfactants
(C) Higher alcohol
(D) Hydrocarbons

The second agent composition of the present invention is prevented from thinning due to filling or discharging into an aerosol container, and the viscosity is kept constant, so it can be stably discharged from an aerosol container, and when used together with the first agent as an aerosol type hair dye or bleach, a stable hair dyeing/bleaching effect can be obtained.

[Second agent composition]
The second agent composition of the present invention is used as an aerosol type hair dye or hair bleach in combination with a first agent composition containing an alkaline agent.

[Component (A): Hydrogen peroxide]
The second agent composition of the present invention contains hydrogen peroxide as component (A). The content of hydrogen peroxide in the second agent composition is preferably 1% by mass or more, more preferably 3% by mass or more, from the viewpoint of obtaining sufficient bleaching power, and is preferably 9% by mass or less, more preferably 6% by mass or less, from the viewpoint of suppressing irritation to the scalp.

[Component (B): Nonionic surfactant]
The second agent composition of the present invention contains a nonionic surfactant as component (B). Examples of component (B) include polyoxyalkylene alkyl ethers, alkyl alkanolamides, polyoxyalkylene alkylamines, alkyl polyglucosides, and alkyl glyceryl ethers. Among these, polyoxyalkylene alkyl ethers are preferred, and polyoxyethylene alkyl ethers are more preferred, from the viewpoint of maintaining a constant viscosity of the second agent composition.

The polyoxyethylene alkyl ether may be represented by the following general formula (1):

R ¹ -O-(CH ₂ CH ₂ -O) _m -H (1)
[In the formula, ^R1 represents a linear or branched, saturated or unsaturated hydrocarbon group having 8 to 22 carbon atoms, and m represents an average number of 1 to 100.]

In general formula (1), from the viewpoint of the solubility of the dye contained in the hair dye, the number of carbon atoms in ^R1 is 8 or more, preferably 10 or more, more preferably 12 or more, and is 22 or less, preferably 20 or less, more preferably 18 or less. Component (B) can be used alone or in combination of two or more kinds.

From the viewpoint of the stability of the second agent composition, component (B) is preferably a combination of (B-1) where m in general formula (1) is 1 or more and less than 30, and (B-2) where m is 30 or more and 100 or less, more preferably a combination of (B-1) where m is 1 or more and 20 or less, and (B-2) where m is 35 or more and 60 or less, and even more preferably a combination of (B-1) where m is 1 or more and 10 or less, and (B-2) where m is 35 or more and 45 or less. From the viewpoint of the stability of the second agent composition, the mass ratio of component (B-1) to component (B-2) [(B-1):(B-2)] is preferably 0.5:9.5 to 4:1, more preferably 1:9 to 3:2, even more preferably 1.5:8.5 to 1:1, and even more preferably 1:4 to 2:3.

From the viewpoint of maintaining a constant viscosity of the second agent composition, the content of component (B) in the second agent composition is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, even more preferably 5% by mass or more, even more preferably 7% by mass or more, and is preferably 15% by mass or less, more preferably 12% by mass or less, even more preferably 10% by mass or less, even more preferably 9% by mass or less.

[Component (C): Higher alcohol]
The second agent composition of the present invention contains a higher alcohol as component (C). As component (C), a compound represented by the following general formula (2) can be used.

^R2 -OH (2)
[In the formula, ^R2 represents a linear or branched hydrocarbon group having 12 to 24 carbon atoms.]

Component (C) includes lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, carnaubinyl alcohol, oleyl alcohol, etc. Component (C) can be used alone or in combination of two or more.

From the viewpoint of maintaining a constant viscosity of the second agent composition, component (C) is preferably a combination of (C-1) a linear alkyl group having from 12 to 18 carbon atoms and (C-2) a linear alkyl group having from 20 to 24 carbon atoms in general formula (2), and more preferably a combination of ( ^C -1) a linear alkyl group having from 14 to 18 carbon atoms and (C-2) a linear alkyl group having from 20 to 22 carbon atoms. From the viewpoint of maintaining a constant viscosity of the second agent composition, the mass ratio of component (C-1) to component (C-2) [(C-1):(C-2)] is preferably 0.5:9.5 to 9.5:0.5, more preferably 1:9 to 9:1, even more preferably 1.5:8.5 to 8.5:1.5, even more preferably 1:4 to 4:1, and even more preferably 1:3 to 3:1.

From the viewpoint of maintaining a constant viscosity of the second agent composition, the content of component (C) in the second agent composition is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, even more preferably 1.0% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, and is preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less.

[Component (D): Hydrocarbons]
The second agent composition of the present invention contains a hydrocarbon as component (D). The hydrocarbon of component (D) used in the present invention is preferably liquid at 25°C, and examples thereof include liquid paraffin, liquid isoparaffin, light isoparaffin, light liquid isoparaffin, heavy liquid isoparaffin, and squalane. Among these, liquid paraffin is preferred from the viewpoint of maintaining a constant viscosity of the second agent composition. Component (D) can be used alone or in combination of two or more.

The content of component (D) in the second agent composition is preferably 3% by mass or more, more preferably 5% by mass or more, from the viewpoint of improving the brightness after dyeing or bleaching, and is preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 12% by mass or less.

The mass ratio of the total of components (C) and (D) to component (B) in the second agent composition [(C) + (D)]/(B) is 1.0 or more, preferably 1.2 or more, more preferably 1.5 or more, and is 3.5 or less, preferably 3.3 or less, more preferably 3.2 or less, from the viewpoint of maintaining a constant viscosity of the second agent composition.

Furthermore, the mass ratio (D)/(C) of component (D) to component (C) in the second agent composition is 1.2 or more, preferably 1.3 or more, and 2.2 or less, preferably 2.1 or less, from the viewpoint of maintaining a constant viscosity of the second agent composition.

[Component (E): Cationic surfactant]
The second agent composition of the present invention may contain a cationic surfactant as component (E). As the cationic surfactant of component (E), monoalkyltrimethylammonium chloride and monoalkyltrimethylammonium bromide are preferable, and among them, stearyltrimethylammonium chloride (steartrimonium chloride), cetyltrimethylammonium chloride (cetrimonium chloride), and lauryltrimethylammonium chloride (lauryltrimonium chloride) can be used. Component (E) can be used alone or in combination of two or more.

From the viewpoint of preventing corrosion of the metal container, the content of component (E) in the second agent composition is preferably 0.001% by mass or less, more preferably 0.0005% by mass or less, and further preferably does not contain component (E).

[Component (F): Hydroxyethanediphosphonic acid]
The second agent of the present invention may contain hydroxyethanediphosphonic acid as component (F). From the viewpoint of stabilizing hydrogen peroxide, the content of component (F) in the second agent composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.10% by mass or more, even more preferably 0.3% by mass or more, and is preferably 2% by mass or less, more preferably 1.5% by mass or less, even more preferably 1% by mass or less.

[pH]
From the viewpoint of inhibiting decomposition of hydrogen peroxide, the pH (25° C.) of the second agent composition of the present invention is preferably 2 or more, more preferably 2.5 or more, and is preferably 6 or less, more preferably 4 or less. Examples of pH adjusters include inorganic acids such as hydrochloric acid and phosphoric acid; organic acids such as citric acid, glycolic acid, and lactic acid; and phosphates such as monopotassium dihydrogen phosphate and disodium monohydrogen phosphate.

〔viscosity〕
The viscosity of the second agent composition of the present invention before it is filled into an aerosol container (hereinafter referred to as "viscosity 1") is, from the viewpoint of formulation stability, preferably 5,000 mPa·s or more, more preferably 10,000 mPa·s or more, even more preferably 15,000 mPa·s or more, even more preferably 20,000 mPa·s or more, even more preferably 25,000 mPa·s or more, and is preferably 100,000 mPa·s or less, more preferably 90,000 mPa·s or less, even more preferably 80,000 mPa·s or less, even more preferably 70,000 mPa·s or less, and even more preferably 50,000 mPa·s or less.

The viscosity (hereinafter referred to as "viscosity 2") immediately after the second agent composition of the present invention is discharged from the second container one month after filling the inner bag with the second agent composition of the present invention is, from the viewpoint of the stability of the formulation, preferably 5,000 mPa·s or more, more preferably 10,000 mPa·s or more, even more preferably 15,000 mPa·s or more, even more preferably 20,000 mPa·s or more, even more preferably 25,000 mPa·s or more, and also preferably 100,000 mPa·s or less, more preferably 90,000 mPa·s or less, even more preferably 80,000 mPa·s or less, even more preferably 70,000 mPa·s or less, even more preferably 50,000 mPa·s or less.

From the viewpoint of formulation stability, the ratio of viscosity 2 to viscosity 1 (viscosity 2/viscosity 1) is preferably 0.80 or more, more preferably 0.85 or more, even more preferably 0.90 or more, even more preferably 0.93 or more, and is preferably 1.25 or less, more preferably 1.20 or less, even more preferably 1.15 or less, even more preferably 1.13 or less.

The viscosity (25°C) of the second agent composition of the present invention is measured using a B-type viscometer with a helical stand and a T-C rotor after rotating at 10 rpm for 1 minute.

[Volume average diameter of emulsified particles in second agent composition]
From the viewpoint of maintaining a constant viscosity, the volume average diameter of the emulsified particles before the second agent composition of the present invention is preferably 0.05 μm or more, more preferably 0.10 μm or more, and is preferably 23 μm or less, even more preferably 20 μm or less, even more preferably 15 μm or less, even more preferably 12 μm or less, and even more preferably 10 μm or less.

By setting the above range, the viscosity of the second agent composition discharged from the second container can be kept constant in any temperature range.

Here, the volume average diameter of the emulsified particles in the second agent composition was obtained by measuring the volume distribution of the average diameter of the second agent using a HORIBA dynamic light scattering particle size distribution analyzer, with the sample setting set to "Organic sample" (refractive index: 1.600-0.000i) and the dispersion medium setting set to "Water" (refractive index: 1.333).

[First agent composition]
The second agent composition of the present invention is used as an aerosol type hair dye or hair bleach in combination with a first agent composition containing an alkaline agent.

[Alkaline agent]
The first agent composition contains an alkaline agent. Examples of the alkaline agent include ammonia and its salts (e.g., ammonium hydrogen carbonate); alkanolamines and their salts, such as monoethanolamine, isopropanolamine, 2-amino-2-methylpropanol, and 2-aminobutanol; alkanediamines and their salts, such as 1,3-propanediamine; and carbonates, such as guanidine carbonate, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate. These alkaline agents can be used alone or in combination of two or more.

The content of the alkaline agent in the first agent composition is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and even more preferably 2% by mass or more, from the viewpoint of sufficient hair dyeing effect, and is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 7% by mass or less, from the viewpoint of reducing hair damage and scalp irritation.

〔dye〕
When the second agent composition of the present invention is a second agent for a hair dye, the first agent composition may contain an oxidative dye intermediate or a direct dye.

(Oxidation dye intermediates)
The oxidation dye intermediate may be a known precursor or coupler that is generally used in hair dyes. Examples of the precursor include paraphenylenediamine, toluene-2,5-diamine, orthochloroparaphenylenediamine, N-phenylparaphenylenediamine, N,N-bis(hydroxyethyl)paraphenylenediamine, 3-methyl-4-aminophenol, 2-hydroxyethylparaphenylenediamine, paraaminophenol, paramethylaminophenol, 4-amino-metacresol, orthoaminophenol, and salts thereof.

Examples of couplers include resorcin, 2-methylresorcin, 1-naphthol, 1,5-dihydroxynaphthalene, 5-amino-orthocresol, metaphenylenediamine, ortho-aminophenol, meta-aminophenol, para-aminophenol, 2,4-diaminophenoxyethanol, 2,6-diaminopyridine, 2-methyl-5-hydroxyethylaminophenol, 2-amino-3-hydroxypyridine, and salts thereof.

The precursor and coupler may be used alone or in combination of two or more kinds. The content of each of the precursor and coupler in the first agent composition is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and is preferably 5% by mass or less, more preferably 4% by mass or less.

(Direct dyes)
Examples of direct dyes include acid dyes, nitro dyes, disperse dyes, basic dyes, etc. More specifically, examples of acid dyes include Blue No. 1, Purple No. 401, Black No. 401, Orange No. 205, Red No. 227, Red No. 106, Yellow No. 203, and Acid Orange No. 3, and examples of nitro dyes include 2-nitro-p-phenylenediamine, 2-amino-6-chloro-4-nitrophenol, 3-nitro-p-hydroxyethylaminophenol, 4-nitro-o-phenylenediamine, 4-amino-3-nitrophenol, 4-hydro- Examples of the disperse dyes include disperse purple 1, disperse blue 1, and disperse black 9. Examples of the basic dyes include basic blue 99, basic brown 16, basic brown 17, basic red 76, basic yellow 76, basic orange 31, and basic red 51.

The direct dyes may be used alone or in combination of two or more, and may be used in combination with an oxidative dye intermediate. The content of the direct dye in the first agent is preferably 0.001% by mass or more, more preferably 0.01% by mass or more, and is preferably 5% by mass or less, more preferably 3% by mass or less.

[Other ingredients in the first agent]
The first agent may contain components that are commonly used in the art in addition to the above-mentioned alkaline agent and dye.

[Shape of aerosol container]
Examples of aerosol containers that can be used in the present invention include (1) double-type aerosol containers in which an inner bag containing a first agent and an inner bag containing a second agent are housed in separate aerosol containers (e.g., the container described in JP 2000-297018 A), and (2) double-type aerosol containers in which an inner bag containing a first agent and an inner bag containing a second agent are each housed in a single aerosol container (e.g., the container described in JP 2013-43659 A).

The inner bag is preferably elastic and made of synthetic resins such as high or low density polyethylene, saponified ethylene-vinyl acetate copolymer, polyethylene terephthalate, polypropylene, polyacrylonitrile, or laminates of these. Preferably, the inner bag has low propellant gas permeability. The inner surface of the inner bag can also be coated with a chemical-resistant resin.

The propellant gas used in the present invention is not particularly limited and may be any gas generally used in aerosol products, such as dimethyl ether, liquefied petroleum gas, nitrogen gas, or alternative fluorocarbons. Of these, nitrogen gas is preferred from the standpoint of preventing deterioration.

[Dosage form]
The second agent composition of the present invention may be in the form of a cream, gel, paste, foam, or the like when ejected from an aerosol container.

[Method of producing an aerosol type hair dye or hair bleach]
An aerosol type hair dye or hair bleach can be produced by filling an aerosol container with the first agent composition containing an alkaline agent and the second agent composition of the present invention, respectively. In this case, it is preferable to adjust the viscosity of the second agent composition of the present invention to the above-mentioned viscosity range, i.e., 5,000 mPa·s or more and 100,000 mPa·s or less, before filling it into the aerosol container.

[Hair dyeing tools]
The aerosol type hair dye or bleach of the present invention can be applied to hair using a hair dyeing tool, such as a hair dyeing tool having a brush part and a comb part as described in JP-A-2006-326081.

With regard to the above-described embodiment, further preferred aspects of the present invention are disclosed below.

<1> A second-agent composition for aerosol type hair dye or hair bleach to be used by mixing with a first-agent composition containing an alkaline agent, the second-agent composition for aerosol type hair dye or hair bleach containing the following components (A) to (D), in which the mass ratio of the total of components (C) and (D) to component (B), [(C)+(D)]/(B), is 1.0 or more and 3.5 or less, and the mass ratio of component (D) to component (C), (D)/(C), is 1.2 or more and 2.2 or less.
(A) Hydrogen peroxide
(B) Nonionic surfactants
(C) Higher alcohol
(D) Hydrocarbons

<2> The second agent composition according to <1>, in which the content of component (A) in the second agent composition is preferably 1% by mass or more, more preferably 3% by mass or more, and is also preferably 9% by mass or less, more preferably 6% by mass or less.

<3> The second agent composition according to <1> or <2>, wherein the component (B) is preferably a polyoxyethylene alkyl ether represented by the following general formula (1).
R ¹ -O-(CH ₂ CH ₂ -O) _m -H (1)
[In the formula, ^R1 represents a linear or branched, saturated or unsaturated hydrocarbon group having 8 to 22 carbon atoms, and m represents an average number of 1 to 100.]

<4> The second agent composition according to <3>, in which the number of carbon atoms in R ¹ in general formula (1) is preferably 10 or more, more preferably 12 or more, and is preferably 20 or less, more preferably 18 or less.

<5> The second agent composition according to <3> or <4>, in which component (B) is preferably a combination of (B-1) a polyoxyethylene alkyl ether in which m in general formula (1) is 1 or more and less than 30 and (B-2) a polyoxyethylene alkyl ether in which m in general formula (1) is 30 or more and 100 or less, more preferably a combination of (B-1) a polyoxyethylene alkyl ether in which m in general formula (1) is 1 or more and 20 or less and (B-2) a polyoxyethylene alkyl ether in which m in general formula (1) is 35 or more and 60 or less, and even more preferably a combination of (B-1) a polyoxyethylene alkyl ether in which m in general formula (1) is 1 or more and 10 or less and (B-2) a polyoxyethylene alkyl ether in which m in general formula (1) is 35 or more and 45 or less.

<6> The second agent composition according to <5>, in which the mass ratio of component (B-1) to component (B-2) [(B-1):(B-2)] is preferably 0.5:9.5 to 4:1, more preferably 1:9 to 3:2, even more preferably 1.5:8.5 to 1:1, and even more preferably 1:4 to 2:3.

<7> The second agent composition according to any one of <1> to <6>, in which the content of component (B) in the second agent composition is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, even more preferably 5% by mass or more, even more preferably 7% by mass or more, and is preferably 15% by mass or less, more preferably 12% by mass or less, even more preferably 10% by mass or less, even more preferably 9% by mass or less.

<8> The second agent composition according to any one of <1> to <7>, wherein the component (C) is a higher alcohol represented by the following general formula (2):
^R2 -OH (2)
[In the formula, ^R2 represents a linear or branched hydrocarbon group having 12 to 24 carbon atoms.]

<9> The second agent composition according to <8>, wherein component (C) is preferably a combination of a higher alcohol (C-1) in which R ² in general formula (2) is a straight-chain hydrocarbon group having from 12 to 18 carbon atoms, and a higher alcohol (C-2) in which R ² in general formula (2) is a straight-chain hydrocarbon group having from 20 to 24 carbon atoms, and more preferably a combination of a higher alcohol (C-1) in which R ² in general formula (2) is a straight-chain hydrocarbon group having from 14 to 18 carbon atoms, and a higher alcohol (C-2) in which R ² in general formula (2) is a straight-chain hydrocarbon group having from 20 to 22 carbon atoms.

<10> The second agent composition according to <9>, in which the mass ratio of component (C-1) to component (C-2) [(C-1):(C-2)] is preferably 0.5:9.5 to 9.5:0.5, more preferably 1:9 to 9:1, even more preferably 1.5:8.5 to 8.5:1.5, even more preferably 1:4 to 4:1, even more preferably 1:3 to 3:1.

<11> The second agent composition according to any one of <1> to <10>, in which the content of component (C) in the second agent composition is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, even more preferably 1.0% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, and is preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less.

<12> The second agent composition according to any one of <1> to <11>, wherein component (D) is preferably a hydrocarbon that is liquid at 25°C.

<13> The second agent composition according to <12>, in which component (D) is preferably at least one selected from the group consisting of liquid paraffin, liquid isoparaffin, light isoparaffin, light liquid isoparaffin, heavy liquid isoparaffin and squalane.

<14> The second agent composition according to any one of <1> to <13>, in which the content of component (D) in the second agent composition is preferably 3% by mass or more, more preferably 5% by mass or more, and is preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, and even more preferably 12% by mass or less.

<15> The second agent composition according to any one of <1> to <14>, in which the mass ratio of the total of components (C) and (D) to component (B) in the second agent composition, [(C) + (D)]/(B), is preferably 1.2 or more, more preferably 1.5 or more, and is preferably 3.3 or less, more preferably 3.2 or less.

<16> The second agent composition according to any one of <1> to <15>, in which the mass ratio (D)/(C) of component (D) to component (C) in the second agent composition is preferably 1.3 or more and preferably 2.1 or less.

<17> The second agent composition according to any one of <1> to <16>, which may further contain a cationic surfactant as component (E), preferably in an amount of 0.001% by mass or less, more preferably 0.0005% by mass or less, of the second agent composition, and more preferably does not contain component (E).

<18> The second agent composition according to any one of <1> to <17>, preferably further containing hydroxyethanediphosphonic acid as component (F).

<19> The second agent composition according to <18>, in which the content of component (F) in the second agent composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.10% by mass or more, even more preferably 0.3% by mass or more, and is preferably 2% by mass or less, more preferably 1.5% by mass or less, even more preferably 1% by mass or less.

<20> The second agent composition according to any one of <1> to <19>, which has a pH at 25°C of preferably 2 or more, more preferably 2.5 or more, and preferably 6 or less, more preferably 4 or less.

<21> The second agent composition according to any one of <1> to <20>, which has a viscosity before being filled into an aerosol container of preferably 5,000 mPa·s or more, more preferably 10,000 mPa·s or more, even more preferably 15,000 mPa·s or more, even more preferably 20,000 mPa·s or more, even more preferably 25,000 mPa·s or more, and is preferably 100,000 mPa·s or less, more preferably 90,000 mPa·s or less, even more preferably 80,000 mPa·s or less, even more preferably 70,000 mPa·s or less, even more preferably 50,000 mPa·s or less.

<22> The second agent composition according to any one of <1> to <21>, which has a viscosity immediately after being filled into the inner bag and discharged from the second container one month later of preferably 5,000 mPa·s or more, more preferably 10,000 mPa·s or more, even more preferably 15,000 mPa·s or more, even more preferably 20,000 mPa·s or more, even more preferably 25,000 mPa·s or more, and is also preferably 100,000 mPa·s or less, more preferably 90,000 mPa·s or less, even more preferably 80,000 mPa·s or less, even more preferably 70,000 mPa·s or less, even more preferably 50,000 mPa·s or less.

<23> The second agent composition according to any one of <1> to <22>, in which the ratio (viscosity 2/viscosity 1) of the viscosity (viscosity 2) immediately after filling into the inner bag and discharging from the second container one month later to the viscosity (viscosity 1) before filling into the aerosol container is preferably 0.80 or more, more preferably 0.85 or more, even more preferably 0.90 or more, even more preferably 0.93 or more, and is preferably 1.25 or less, more preferably 1.20 or less, even more preferably 1.15 or less, even more preferably 1.13 or less.

<24> The second agent composition according to any one of <1> to <23>, in which the volume average diameter of the emulsified particles of the second agent composition before filling into the inner bag is preferably 0.05 μm or more, more preferably 0.10 μm or more, and also preferably 23 μm or less, even more preferably 20 μm or less, even more preferably 15 μm or less, even more preferably 12 μm or less, even more preferably 10 μm or less.

Example 1, Comparative Example 1
A second agent composition was prepared according to the formulation shown in Table 1. The second agent composition was then filled into the inner bag of the second container of a double-barreled aerosol, and nitrogen gas was filled between the inner bag and the second agent container. The viscosity and volume average diameter of the second agent composition were measured by the methods shown below.

(Viscosity Measurement Method)
The viscosity of the second agent composition was measured at two points in time: before filling into the container and immediately after discharging from the container one month after filling into the container. The viscosity (25°C) was measured using a B-type viscometer with a helical stand (manufactured by Toki Sangyo Co., Ltd., Model TVB-10R, T-BAR STAGE TS-10) after rotating at 10 rpm with a TC rotor for 1 minute.

(Method for measuring volume average diameter of emulsion particles)
The volume average diameter of the emulsion particles was obtained by measuring the volume distribution of the average diameter of the emulsion particles using a HORIBA DYNAMIC LIGHT SCATTERING PARTICLE SIZE ANALYZER LB-500, selecting the sample setting as "Organic sample" (refractive index: 1.600-0.000i) and the dispersion medium setting as "Water" (refractive index: 1.333).

Examples 2 to 7, Comparative Examples 2 to 5
Second agent compositions were prepared having the formulations shown in Tables 2 and 3. The volume average diameter of the emulsified particles in the second agent compositions was measured by the method described above.

Claims (7)

A second-agent composition for aerosol type hair dye or hair bleach, which is used by mixing with a first-agent composition containing an alkaline agent, contains the following components (A) to (D) and (F) , and the content of the cationic surfactant (E) is 0.001% by mass or less or does not contain component (E):
A second-agent composition for aerosol type hair dyeing or hair bleaching, in which the mass ratio of the total of components (C) and (D) to component (B), [(C)+(D)]/(B), is 1.0 or more and 3.5 or less, the mass ratio of component (D) to component (C), (D)/(C), is 1.3 or more and 2.1 or less, and the viscosity immediately after being discharged from a container is 10,000 mPa s or more and 100,000 mPa s or less.
(A) Hydrogen peroxide
(B) Nonionic surfactant : 3% by mass or more and 9% by mass or less
(C) Stearyl alcohol (C-1) and behenyl alcohol (C-2) 3% by mass or more and 8% by mass or less
(D) Hydrocarbons : 5% by mass or more and 12% by mass or less
(F) Hydroxyethanediphosphonic acid: 0.3% by mass or more and 2% by mass or less The second agent composition according to claim 1, wherein component (B) is a polyoxyethylene alkyl ether represented by the following general formula (1):
R ¹ -O-(CH ₂ CH ₂ -O) _m -H (1)
[In the formula, ^R1 represents a linear or branched, saturated or unsaturated hydrocarbon group having 8 to 22 carbon atoms, and m represents an average number of 1 to 100.] The second agent composition according to claim 2, wherein component (B) is a combination of (B-1) a polyoxyethylene alkyl ether in which m in general formula (1) is 1 or more and less than 30, and (B-2) a polyoxyethylene alkyl ether in general formula (1) in which m is 30 or more and 100 or less. The second agent composition according to claim 3, wherein the mass ratio of component (B-1) to component (B-2) [(B-1):(B-2)] is 0.5:9.5 to 4:1. The second agent composition according to any one of claims 1 to 3 , wherein the mass ratio of component (C-1) to component (C-2) [(C-1):(C-2)] is 0.5:9.5 to 9.5:0.5. The second agent composition according to any one of claims 1 to 5 , wherein the component (D) is at least one selected from the group consisting of liquid paraffin, liquid isoparaffin, light isoparaffin, light liquid isoparaffin, heavy liquid isoparaffin, and squalane. The second agent composition according to any one of claims 1 to 6, in which the ratio (viscosity 2/viscosity 1) of the viscosity immediately after being discharged from the aerosol container to the viscosity (viscosity 1) before being filled into the container is 0.80 or more and 1.25 or less.