JP2024177683A - Aerosol Products - Google Patents

Abstract

To provide an aerosol product that is used by mixing two or more types of agents, in which one or more agents are a low-density composition which foams after being discharged from an aerosol container, which has excellent uniform application performance in application operation to hair, and excellent adhesion performance to hair.SOLUTION: Provided is an aerosol product that is used by mixing two or more types of agents, in which one or more agents are a low-density composition which foams after being discharged from an aerosol container, and a foaming ratio of the low-density composition is twice or more and 30 times or less.SELECTED DRAWING: None

Description

The present invention relates to an aerosol product that uses a mixture of two or more agents.

Conventionally, aerosol products using a mixture of two types of ejection materials are known. The properties of the ejection materials include creams and foams. Creams have the advantage of being highly adhesive to hair and not easily dripping, but compared to foams, they tend to be less easy to apply to hair and are difficult to apply evenly. Foams also have the advantage of being highly easy to apply to hair, but compared to creams, they tend to be less adhesive to hair. In order to obtain both of these advantages, aerosol products using a cream and a foam as the two types of ejection materials are being considered.
For example, Patent Document 1 discloses a two-liquid aerosol product that discharges two kinds of aerosol compositions, in which one discharged product is surrounded by the other discharged product to form a double discharge product, and the surrounded inner discharge product has a lower density than the outer discharge product. Patent Document 2 also discloses a two-liquid discharge aerosol product that includes a container body having a first container filled with a foamable composition and a second container filled with a viscous concentrate, a first passage for extracting the foamable composition in the first container, and a second passage for extracting the viscous concentrate in the second container, a valve mechanism attached to the container body, and a discharge member attached to the valve mechanism and having a discharge mechanism for discharging the viscous concentrate so as to cover at least a part of the foamable composition.

JP 2015-163658 A JP 2017-001692 A

Aerosol products that use conventional foaming agents and aerosol products that use a mixture of a low-density composition and a high-density composition as disclosed in Patent Documents 1 and 2 have the problem of uneven application of the amount of the product when applied to hair. There is also a demand for further improvement in adhesion to hair.

The object of the present invention is to provide an aerosol product that uses a mixture of two or more agents, in which one or more agents are low-density compositions that foam after being discharged from an aerosol container, and that has excellent uniform applicability (hereinafter also referred to as "uniform applicability") when applied to hair and excellent adhesion to hair.

As a result of intensive research into the above-mentioned problems, the present inventors have discovered that in an aerosol product in which two or more agents are mixed and used, and in which one or more agents are a low-density composition that foams after being discharged from an aerosol container, by setting the foaming ratio of the mixed composition after discharge to between 2 and 30 times, the adhesion to hair and the uniform application of the mixture of two or more agents are improved, and have completed the present invention.

The aerosol product of the present invention, which solves the above problems, is an aerosol product that uses a mixture of two or more agents, wherein one or more agents are low-density compositions that foam after being ejected from an aerosol container, and the foaming ratio of the mixture of the two or more agents is 2 times or more and 30 times or less.
According to the aerosol product of the present invention, it is possible to provide an aerosol product that has excellent adhesion to hair and excellent uniform application ability.

In addition, one embodiment of the aerosol product of the present invention is characterized in that the two or more agents include a low-density composition and a high-density composition, wherein the low-density composition has a density at 25°C of 0.01 g/mL or more and 0.30 g/mL or less, and the high-density composition has a density at 25°C of more than 0.30 g/mL and 1.5 g/mL or less.
This feature makes it possible to provide an aerosol product that combines the adhesiveness to hair of a high-density composition with the ease of application to hair of a low-density composition.

In one embodiment of the aerosol product of the present invention, each of the two or more agents comprises (A) a nonionic surfactant and (B) a higher alcohol.
According to this feature, it is possible to provide an aerosol product that is particularly excellent in terms of uniform application properties.

In one embodiment of the aerosol product of the present invention, the two or more agents contain an ionic surfactant (C).
According to this feature, it is possible to provide an aerosol product that is particularly excellent in terms of adhesion to hair and uniform application properties.

According to the present invention, an aerosol product using a mixture of two or more agents, in which one or more agents are low-density compositions that foam after being discharged from an aerosol container, can be provided that has uniform applicability when applied to hair and excellent adhesion to hair.

The aerosol product of the present invention is an aerosol product in which two or more kinds of agents are mixed and used, and one or more agents are low-density compositions that foam after being discharged from an aerosol container. The dosage form of the other agents other than the low-density composition is not particularly limited as long as they can be mixed with the low-density composition, and may be, for example, a low-density composition such as a foam, or a high-density composition such as a cream, gel, liquid, or emulsion.
According to the aerosol product of the present invention, by setting the foaming ratio of the mixed composition after ejection to be 2 to 30 times, it is possible to provide an aerosol product that has excellent adhesion to hair and uniform application properties.

Hereinafter, embodiments of the aerosol product according to the present invention will be described in detail.
The aerosol products described in the present embodiment are merely examples for the purpose of explaining the present invention, and the present invention is not limited thereto.
In addition, in the description of the technical features of each component in this specification, unless there is a statement specifying a low-density composition or a high-density composition, the technical features apply to both the low-density composition and the high-density composition.

[Aerosol products]
The aerosol product is a product in which two or more kinds of agents are mixed and used after being discharged from an aerosol container. The aerosol product of the present invention is characterized in that it comprises a low-density composition that foams after at least one agent is discharged from the aerosol container, and the mixture of the two or more agents has an expansion ratio of 2 to 30 times.
The lower limit of the expansion ratio of the mixture of two or more kinds of agents is preferably 3 times or more.The upper limit is preferably 28 times or less, more preferably 25 times or less, even more preferably 20 times or less, and particularly preferably 15 times or less.
By setting the content within this range, excellent effects can be obtained with respect to uniform coating property and adhesion.

The aerosol product of the present invention preferably comprises a low-density composition and a high-density composition. A low-density composition has a density of 0.01 g/mL or more and 0.30 g/mL or less at 25°C, and a high-density composition has a density of more than 0.30 g/mL and 1.5 g/mL or less at 25°C. By comprising a high-density composition, adhesion to hair can be improved.

The aerosol product may be a composition of three or more types, not just two types, such as a low-density composition + a low-density composition + a low-density composition, a low-density composition + a low-density composition + a high-density composition, a low-density composition + a high-density composition + a high-density composition, a high-density composition + a high-density composition + a high-density composition, etc.

The density of the low-density composition at 25° C. is 0.01 g/mL or more and 0.30 g/mL or less. The lower limit is preferably 0.05 g/mL or more, more preferably 0.1 g/mL or more. The upper limit is preferably 0.28 g/mL or less, more preferably 0.25 g/mL or less.
A specific formulation is a foaming agent. The foaming agent may be one that foams with a foaming gas or the like during or after ejection, and may be one that foams immediately after ejection with a foaming agent such as liquefied petroleum gas (LPG), or one that foams after ejection with a post-foaming agent such as isopentane. The composition before ejection (before foaming) may be a liquid composition, a milky composition, a gel composition, or a creamy composition.

The density of the high-density composition at 25° C. is greater than 0.30 g/mL and not greater than 1.5 g/mL. The lower limit is preferably 0.40 g/mL or more, more preferably 0.50 g/mL or more. The upper limit is preferably 1.4 g/mL or less, more preferably 1.3 g/mL or less.
The specific dosage form is not particularly limited, but may be, for example, a cream, a gel, a liquid, or an emulsion. The dosage form of the high-density composition is preferably a cream or a gel. The composition before ejection may be the same as that after ejection, and may be a cream composition, a gel composition, a liquid composition, or an emulsion composition, or may change in state within the above density range after ejection.

In the present invention, the viscosity of each state is, for example, preferably less than 3,000 millipascal seconds (mPa·s) at 25°C for liquid and emulsion formulations, and preferably 3,000 to 50,000 mPa·s at 25°C for cream and gel formulations.

The mixing ratio of the low-density composition to the high-density composition (low-density composition: high-density composition) is, for example, 1:0.5 to 1:4, preferably 1:0.6 to 1:3.5, and more preferably 1:0.7 to 1:3.

The method for measuring density at 25°C involves dispensing the low-density or high-density composition into a 100-mL volumetric cup whose weight has been measured in advance until it overflows, and immediately after dispensing, preferably one minute after dispensing, the overflowing composition is leveled off at the top of the 100-mL volumetric cup, and the weight of the low-density or high-density composition per 100 mL volume is measured.

The aerosol product has an aerosol container filled with a composition that becomes a low-density composition or a high-density composition after being discharged, and a discharge port for separately discharging the low-density composition and the high-density composition, respectively. The aerosol container may be a double aerosol container in which the low-density composition and the high-density composition are filled in separate containers, or a single aerosol container in which the high-density composition filled in an inner bag is placed in a container containing the low-density composition.
The timing of ejection of the two or more kinds of agents may be simultaneous or separate. From the viewpoint of easy ejection by the user, it is preferable that two or more kinds of agents are ejected simultaneously by one ejection operation. In addition, the timing of mixing may be simultaneous with ejection or after ejection.

In an aerosol product having a low-density composition and a high-density composition as two kinds of agents, from the viewpoint of improving the mixability of the low-density composition and the high-density composition, the low-density composition and the high-density composition may be discharged so that they come into contact with each other during or after discharge. The arrangement of the low-density composition and the high-density composition after discharge is not particularly limited, but may be, for example, a two-layered arrangement in which the low-density composition (e.g., foam agent) and the high-density composition (e.g., cream agent) are arranged vertically or horizontally, or a double-tube arrangement in which the low-density composition and the high-density composition are arranged inside and outside. From the viewpoint of excellent mixability, in the case of a two-layered arrangement, it is preferable that the lower layer is a low-density composition and the upper layer is a high-density composition, and in the case of a double-tube arrangement, it is preferable that the inside is a low-density composition and the outside is a high-density composition.
When three or more types of compositions are used, the composition may be in the form of a multi-layer or multi-layered cylinder. For example, the composition may be in the form of a three-layered cylinder having a lower layer of a foam, a middle layer of a foam, and an upper layer of a cream, or in the form of a triple-layered cylinder having an innermost layer of a foam, a middle layer of a foam, and an outermost layer of a cream.

The use of the aerosol product of the present invention is not particularly limited as long as it is a product that uses a mixture of two or more agents, and examples thereof include hair cosmetics such as hair dyes, bleaches, and hair styling products, and external cosmetics such as hair removal creams and shaving gels. From the viewpoint of further exerting the effects of the present invention, such as excellent uniform application and adhesion, it is preferable to use it in an oxidation hair dye or bleaching/decoloring agent that has a first agent containing an alkaline agent and a second agent containing an oxidizing agent, or other two-agent hair coloring composition (hair dye, color treatment, color shampoo, etc.). When used in an oxidation hair dye or bleaching/decoloring agent, it is possible to obtain the effects of excellent hair dyeing power (bleaching power) and uniform dyeing ability (uniform bleaching ability).
When used in an oxidation hair dye or a bleaching/decolorizing agent, it is preferable to use a foam as the first agent and a cream as the second agent.

[Low density composition, high density composition]
Next, a low-density composition and a high-density composition will be described as compositions constituting two or more agents of the aerosol product of the present invention.
The low-density composition and the high-density composition of the present invention preferably contain (A) a nonionic surfactant, (B) a higher alcohol, (C) an ionic surfactant, and (D) an oil component. These components (A) to (D) may be contained in either the low-density composition or the high-density composition, or in both. From the viewpoint of achieving a more effective effect, it is preferable that both of them are contained.

The components used in the low-density and high-density compositions are explained below, but unless otherwise specified, they apply to both low-density and high-density compositions.

<(A) Nonionic Surfactant>
The nonionic surfactant is a surfactant having a hydrophilic group that does not undergo ionic dissociation when dissolved in water. In the aerosol product of the present invention, the nonionic surfactant is contained in either the low-density composition or the high-density composition or in both compositions. Preferably, the nonionic surfactant is contained in both compositions. By containing the nonionic surfactant, the emulsion stability of the low-density composition and the high-density composition is improved.

Examples of nonionic surfactants include ether-type nonionic surfactants such as polyoxyethylene alkyl ether and polyoxypropylene alkyl ether, ester-type nonionic surfactants, ester ether-type nonionic surfactants, alkanolamide-type nonionic surfactants, alkyl glucosides, and lecithin derivatives such as hydrogenated soybean lecithin. Ether-type nonionic surfactants are preferred.

Specific examples of ether-type nonionic surfactants include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene behenyl ether, polyoxyethylene lanolin, and polyoxyethylene phytosterol.

The number of repeating units of polyalkylene oxide such as polyoxyethylene in the ether-type nonionic surfactant is, for example, 2 or more and 200 or less, with the upper limit being preferably 150 or less, and more preferably 125 or less.

The HLB (hydrophile-lipophile balance) value of the nonionic surfactant is not particularly limited, as long as it is, for example, 2.0 or more and 20.0 or less. It is preferable to use two or more nonionic surfactants with different HLB values. Specifically, in the case of a low-density composition (particularly a foaming agent), it is preferable to include a nonionic surfactant with an HLB value of 15.0 or less and a nonionic surfactant with an HLB value of more than 15.0. In the case of a high-density composition (particularly a cream), it is preferable to include a nonionic surfactant with an HLB value of 10.0 or less and a nonionic surfactant with an HLB value of more than 10.0. By using these nonionic surfactants, the effect of the present invention can be further exhibited.

The HLB value in the present invention is an actual measured value. The HLB value was devised by W. C. Griffin and is a numerical value given to nonionic surfactants, which represents the balance between the strength of the lipophilic group (alkyl group) and the hydrophilic group (ethylene oxide chain) of the nonionic surfactant in numerical form. The actual measured value calculated from the emulsification method is used for the HLB value (see "Handbook - Cosmetics and Pharmaceutical Raw Materials" Nikko Chemicals Co., Ltd. (revised edition published on February 1, 1977)). To measure the actual HLB value, a combination of sorbitan monostearate (e.g., NIKKOL SS-10 manufactured by Nikko Chemicals Co., Ltd., HLB value 4.7) and polyoxyethylene sorbitan monostearate (e.g., NIKKOL TS-10 manufactured by Nikko Chemicals Co., Ltd., HLB value 14.9) is used as a standard substance for surfactants. Liquid paraffin is used as the material to be emulsified. In addition, if the liquid paraffin is likely to vary depending on the type or lot, it is measured each time. Liquid paraffin is emulsified with the above two types of surfactants to determine the optimal surfactant ratio and the required HLB value of the liquid paraffin (emulsified HLB value). The calculation formula is shown in formula (1).

The required HLB value of liquid paraffin is usually around 10.1 to 10.3, depending on the type and lot. Next, the HLB value of the unknown surfactant is measured using the liquid paraffin for which the required HLB value was determined. If the unknown surfactant is hydrophilic, it is combined with sorbitan monostearate, and if the unknown surfactant is hydrophobic, it is combined with polyoxyethylene sorbitan monostearate, and the liquid paraffin is emulsified to determine the optimal ratio at which stability is achieved, and the HLB value of the unknown surfactant is calculated as x by applying it to the above formula (1).

The content of the nonionic surfactant in the low-density composition of the present invention 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 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, and particularly preferably 1.0% by mass or more. On the other hand, the upper limit is preferably 15.0% by mass or less, more preferably 12.5% by mass or less, and even more preferably 10.0% by mass or less.
By setting the content within these ranges, the effect of achieving even better emulsion stability can be obtained.

The content of the nonionic surfactant in the high-density composition of the present invention 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 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, and particularly preferably 1.0% by mass or more. On the other hand, the upper limit is preferably 15.0% by mass or less, more preferably 12.5% by mass or less, and even more preferably 10.0% by mass or less.
By setting the content within these ranges, the effect of achieving even better emulsion stability can be obtained.

In the aerosol product of the present invention, the difference between the nonionic surfactant content of the low-density composition and the nonionic surfactant content of the high-density composition is preferably 2.5% by mass or less, more preferably 2.3% by mass or less, and even more preferably 2.1% by mass or less. By setting the difference in nonionic surfactant content within this range, the effect of further improving adhesion, uniform application, and mixability is observed.

The content of the nonionic surfactant in the mixture of the low-density composition and the high-density 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 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, and particularly preferably 1.0% by mass or more. On the other hand, the upper limit is preferably 15.0% by mass or less, more preferably 12.5% by mass or less, and even more preferably 10.0% by mass or less.
By setting the content within these ranges, it is possible to obtain the effects of further improving adhesion and uniform coating properties.

<(B) Higher Alcohol>
The higher alcohol is a compound having a hydroxyl group as a substituent on a linear, branched or cyclic hydrocarbon having 6 or more carbon atoms. A preferred higher alcohol is a linear higher alcohol.
The higher alcohol preferably has 12 or more and 22 or less carbon atoms.
The number of hydroxyl groups of the higher alcohol is not particularly limited, and it may be a polyhydric alcohol having a plurality of hydroxyl groups, but is preferably a monohydric alcohol.
The hydrocarbon of the higher alcohol may be either a saturated hydrocarbon or an unsaturated hydrocarbon. The higher alcohol may have a substituent other than a hydroxyl group.

Specific examples of higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), stearyl alcohol, isostearyl alcohol, cetostearyl alcohol, decyl alcohol, oleyl alcohol, linoleyl alcohol, linolenyl alcohol, 2-hexyldecanol, arachyl alcohol, behenyl alcohol, lanolin alcohol, 2-octyldodecanol, decyltetradecanol, phytosterol, and cholesterol.
The higher alcohols contained in the low-density compositions (e.g., foams) are preferably myristyl alcohol and cetyl alcohol (cetanol), and the higher alcohols contained in the high-density compositions (e.g., creams) are preferably stearyl alcohol, arachyl alcohol, and behenyl alcohol.

By including a higher alcohol, uniform coating properties are improved.
Furthermore, when the low-density composition contains a higher alcohol, a thick foam is obtained, the foam stability is improved, and the adhesion of the mixture with the high-density composition to hair is also improved.
Furthermore, when the high-density composition contains a higher alcohol, the emulsion stability is improved, and the adhesion to hair and the uniformity of application of the mixture with the low-density composition are improved.
When both the low-density composition and the high-density composition contain a higher alcohol, the mixability of the low-density composition and the high-density composition is improved, and further, the adhesion and uniform application properties of the mixture to hair can be further improved.

The content of the higher alcohol in the low-density 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, and even more preferably 0.4% by mass or more. The upper limit is preferably 7.5% by mass or less, and more preferably 5.0% by mass or less.
By setting the content of higher alcohol in the low-density composition within the above range, a thick foam can be obtained, and the stability of the foam can be improved, while also improving the adhesion to hair and the uniform application property of the mixture with the high-density composition.

The content of the higher alcohol in the high-density composition of the present invention 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 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and particularly preferably 3.0% by mass or more. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less.
By setting the content of higher alcohol in the high-density composition within the above range, it is possible to improve emulsion stability while also improving the adhesion to hair and the uniform application properties of the mixture with the low-density composition.

In the aerosol product of the present invention, the difference between the content of higher alcohol in the low-density composition and the content of higher alcohol in the high-density composition is preferably 5.0% by mass or less, and more preferably 4.5% by mass or less. By setting the difference in the content of higher alcohol within this range, the effect of improving adhesion, uniform application, and mixability is observed.

The content of higher alcohol in the mixture of low-density composition and high-density 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 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and particularly preferably 3.0% by mass or more. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less. By setting it in the above range, it is possible to improve adhesion and uniform application properties.

<(C) Ionic Surfactant>
Ionic surfactants are surfactants having a hydrophilic group that dissolves in water and undergoes ionic dissociation, and include cationic surfactants, anionic surfactants, and amphoteric surfactants. In the aerosol product of the present invention, the ionic surfactant may be contained in either or both of the low-density composition and the high-density composition, and it is preferable that the ionic surfactant is contained in both compositions. By containing the ionic surfactant in the low-density composition and/or the high-density composition, the effects of the present invention, such as excellent uniform application property and excellent adhesion, are further exhibited.

In the aerosol product of the present invention, the ionic surfactant (C) may be any of the cationic surfactant (C1), the anionic surfactant (C2), and the amphoteric surfactant (C3), and among these, the cationic surfactant (C1) and the anionic surfactant (C2) are preferred, and the cationic surfactant (C1) is more preferred. In particular, it is preferred that the cationic surfactant (C1) is contained in both the low-density composition and the high-density composition. By using these ionic surfactants, the effects of the present invention can be further enhanced.

The content of the ionic surfactant in the mixture of the low-density composition and the high-density 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 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, and even more preferably 5.0% by mass or less.
By setting the content within the above range, the uniform coating property and the adhesion can be further improved.

The content of the ionic surfactant in the low-density 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 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, and even more preferably 5.0% by mass or less.
By setting the content within the above range, the uniform coating property and the adhesion can be further improved.

The content of the ionic surfactant in the high-density 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 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, and even more preferably 5.0% by mass or less.
By setting the content within the above range, the uniform coating property and the adhesion can be further improved.

((C1) Cationic Surfactant)
Cationic surfactants are surfactants in which the hydrophilic group that dissociates when dissolved in water becomes a cation. Examples of cationic surfactants include alkyl quaternary ammonium salts such as monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, benzalkonium quaternary ammonium salts, and monoalkyl ether quaternary ammonium salts, alkylamine salts, fatty acid amide amine salts, ester-containing tertiary amine salts, and amine salts such as arcobell tertiary amine salts, cyclic quaternary ammonium salts such as alkylpyridinium salts and alkylisoquinolium salts, and benzethonium chloride. From the viewpoint of more effectively exerting the effects of the present invention, preferred cationic surfactants are alkyl quaternary ammonium salts, more preferably monoalkyl quaternary ammonium salts and dialkyl quaternary ammonium salts, and particularly preferably monoalkyl quaternary ammonium salts.

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

Specific examples of monoalkyl-type quaternary ammonium salts include lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, stearyltrimethylammonium chloride, stearyltrimethylammonium bromide, behenyltrimethylammonium chloride, alkyl(28)trimethylammonium chloride, and methacryloyloxyethyltrimethylammonium chloride.
Preferred are cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, and alkyl(28)trimethylammonium chloride.
These cationic surfactants may be used alone or in combination of two or more.

When a cationic surfactant is contained in either or both of the low-density composition and the high-density composition, the effect of improving the adhesion to hair and the uniform application property of the mixture of the low-density composition and the high-density composition is achieved.
Furthermore, when the foaming agent contains a cationic surfactant as a low-density composition, the foam of the foaming agent has a finer foam texture, improving the foam stability, and further improving the uniform application property of the mixture with the high-density composition and the adhesion to hair.

The content of the cationic surfactant in the low-density composition, the high-density composition, and mixtures thereof 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 0.03% by mass or more, and more preferably 0.05% by mass or more. The upper limit is preferably 7.5% by mass or less, more preferably 5.0% by mass or less, and even more preferably 3.0% by mass or less.

((C2) Anionic Surfactant)
Anionic surfactants are surfactants in which the hydrophilic group that dissociates when dissolved in water becomes an anion. Examples of anionic surfactants include alkyl sulfates, alkyl sulfate ester salts, polyoxyethylene alkyl ether sulfates, alkenyl sulfates, alkenyl sulfate ester salts, alkenyl ether sulfates, olefin sulfonates, alkanesulfonates, saturated fatty acid salts, unsaturated fatty acid salts, alkyl ether carboxylates, alkenyl ether carboxylates, α-sulfonic acid salts, N-acyl amino acid surfactants, phosphoric acid monoester surfactants, phosphoric acid diester surfactants, and sulfosuccinate esters. Preferred examples include alkyl sulfates, polyoxyethylene alkyl ether sulfates, and N-acyl amino acid surfactants.
Examples of counter ions of the anionic groups of these anionic surfactants include sodium ions, potassium ions, and triethanolamine.

Specific examples of anionic surfactants include sodium lauryl sulfate, potassium lauryl sulfate, ammonium lauryl sulfate, triethanolamine lauryl sulfate, sodium myristyl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium polyoxyethylene lauryl ether sulfate, triethanolamine polyoxyethylene lauryl ether sulfate, ammonium polyoxyethylene lauryl ether sulfate, sodium polyoxyethylene stearyl ether sulfate (sodium laureth sulfate), sodium polyoxyethylene lauryl ether acetate, polyoxyethylene lauryl ether phosphoric acid, polyoxyethylene lauryl ether phosphate, disodium lauryl sulfosuccinate, sodium N-stearoyl-N-methyl taurine, triethanolamine dodecylbenzenesulfonate, sodium tetradecenesulfonate, sodium lauryl phosphate, N-lauroyl glutamate salts such as sodium lauroyl glutamate, N-lauroyl methyl-β-alanine salt, N-acyl glycine salt, and N-acyl glutamate salt.
Preferred are sodium lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium polyoxyethylene lauryl ether sulfate (sodium laureth sulfate), sodium N-stearoyl-N-methyl taurate, and N-acyl glutamate.
These anionic surfactants may be used alone or in combination of two or more kinds.

The anionic surfactant can be contained in both or either of the low-density composition and the high-density composition. This allows the mixture of the low-density composition and the high-density composition to have both the adhesion to hair of the high-density composition and the applicability to hair of the low-density composition, and also improves the uniformity of application and adhesion.

The content of the anionic surfactant in the mixture of the low-density composition and the high-density 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 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, and even more preferably 5.0% by mass or less.
By setting the content within the above range, uniform coating properties and adhesion can be further improved.

((C3) Amphoteric Surfactant)
Amphoteric surfactants are surfactants in which the hydrophilic group that dissociates when dissolved in water becomes positively or negatively charged depending on the pH. Examples of amphoteric surfactants include amino acid-type amphoteric surfactants and betaine-type amphoteric surfactants.
In the aerosol product of the present invention, the amphoteric surfactant is contained in either the low-density composition or the high-density composition, or in both compositions. By containing the amphoteric surfactant in the low-density composition and/or the high-density composition, it is possible to provide an aerosol product having excellent uniform application properties and adhesion.

Specific examples of the amino acid type amphoteric surfactant include, for example, N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium (sodium lauroamphoacetate), 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, undecylhydroxyethylimidazolinium betaine sodium, alkyldiaminoethylglycine hydrochloride, N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine sodium, N-coconut oil fatty acid acyl-N'-carboxyethoxyethyl-N' glycine type amphoteric surfactants such as N-carboxyethylethylenediamine disodium, N-coconut oil fatty acid acyl-N'-carboxymethoxyethyl-N'-carboxymethylethylenediamine disodium, sodium lauryldiaminoethylglycine, and palm oil fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium; and aminopropionic acid type amphoteric surfactants such as sodium laurylaminopropionate, sodium laurylaminodipropionate, and triethanolamine laurylaminopropionate.
Preferred are glycine-type amphoteric surfactants and propionic acid-type amphoteric surfactants, and particularly preferred are N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium (sodium lauroamphoacetate), 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, and sodium laurylaminodipropionate.

Specific examples of the betaine type amphoteric surfactant include aminoacetic acid betaine type amphoteric surfactants such as coconut oil alkyl betaine, lauryl dimethylaminoacetate betaine, myristyl dimethylaminoacetate betaine, stearyl dimethylaminoacetate betaine, sodium stearyl dimethyl betaine, coconut oil fatty acid amidopropyl betaine, palm oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, ricinoleic acid amidopropyl betaine, and stearyl dihydroxyethyl betaine; and sulfobetaine type amphoteric surfactants such as lauryl hydroxysulfobetaine.
Aminoacetic acid betaine type amphoteric surfactants are preferred, and lauryl dimethyl aminoacetic acid betaine and coconut oil fatty acid amidopropyl betaine are particularly preferred.
These amphoteric surfactants may be used alone or in combination of two or more.

The amphoteric surfactant can be contained in both or either of the low-density composition and the high-density composition. This allows the mixture of the low-density composition and the high-density composition to have both the adhesion to hair of the high-density composition and the applicability to hair of the low-density composition, as well as improved uniform application and adhesion.

The content of the amphoteric surfactant in the low-density composition, the high-density composition, and the mixture thereof 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 0.05% by mass or more, and more preferably 0.1% by mass or more. The upper limit is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, and even more preferably 5.0% by mass or less.
By setting the content within the above range, uniform coating properties and adhesion can be further improved.

<(D) Oil-based component>
The oil component is a liquid or solid oil component other than the higher alcohol of component (B). Examples of the oil component include hydrocarbon oils, oils and fats, higher fatty acids, waxes, alkyl glyceryl ethers, ester oils, silicone oils, etc. Preferred are hydrocarbon oils, oils and fats, and ester oils, and more preferred are oil components that are liquid at 25°C.
These oily ingredients may be used alone or in combination of two or more.

The oily component can be contained in both or either of the low-density composition and the high-density composition. By containing an oily component, it is possible to further improve the mixability of the low-density composition and the high-density composition, and the uniform application of the mixture of the low-density composition and the high-density composition. It also improves the adhesion, extensibility, and affinity of the mixture to hair.

The oil component may be included in either the first agent containing an alkaline agent or the second agent containing an oxidizing agent, but is preferably included in the second agent.

Hydrocarbons are compounds consisting of carbon and hydrogen. Specific examples of hydrocarbon oils include liquid paraffin, paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, synthetic squalane, hydrogenated squalane, squalane, polybutene, polyethylene, microcrystalline wax, petrolatum, ozokerite, ceresin, limonene, and turpentine. Preferred hydrocarbons are liquid paraffin, paraffin, olefin oligomer, polyisobutene, hydrogenated polyisobutene, microcrystalline wax, and petrolatum, and liquid paraffin is particularly preferred.

The fats and oils are triglycerides, i.e. triesters of fatty acids and glycerin. Specific examples of fats and oils include olive oil, rosehip oil, camellia oil, shea butter, macadamia nut oil, almond oil, tea seed oil, camellia oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, beef tallow, cocoa butter, corn oil, peanut oil, rapeseed oil, rice bran oil, rice germ oil, wheat germ oil, pearl barley oil, grape seed oil, avocado oil, carrot oil, castor oil, linseed oil, coconut oil, mink oil, egg yolk oil, and evening primrose oil. Preferred fats and oils are olive oil, camellia oil, shea butter, grape seed oil, and evening primrose oil.

The higher fatty acid is an aliphatic carboxylic acid having 6 or more carbon atoms. The number of carbon atoms of the higher fatty acid is not particularly limited, and is, for example, 6 or more and 24 or less. The lower limit is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more. On the other hand, the upper limit is preferably 22 or less, more preferably 20 or less, and even more preferably 18 or less.
Furthermore, the carbon chain of the higher fatty acid may be saturated or unsaturated.
Specific examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, undecylenic acid, oleic acid, linoleic acid, ricinoleic acid, lanolin fatty acid, etc. Preferred higher fatty acids are stearic acid and oleic acid.

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

Specific examples of alkyl glyceryl ethers include batyl alcohol, chimyl alcohol, selachyl alcohol, and isostearyl glyceryl ether. A preferred alkyl glyceryl ether is batyl alcohol.

Ester oils are compounds obtained by the dehydration reaction of fatty acids and alcohols. Specific examples of ester oils include diisopropyl adipate, 2-hexyldecyl adipate, isopropyl myristate, myristyl myristate, octyldodecyl myristate, myristyl myristate, isotridecyl myristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate, diisopropyl sebacate, isopropyl palmitate, 2-ethylhexyl palmitate, cetyl ethylhexanoate, butyl stearate, stearyl stearate, and isostearyl. Examples of the ester oil include isocetyl ester, hexyl laurate, decyl oleate, fatty acids (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, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, and hydrogenated castor oil isostearate. A preferred ester oil is cetyl ethylhexanoate.

Silicone oil is a synthetic polymer in which silicon with organic groups and oxygen are alternately linked by chemical bonds. Specific examples of silicone oil include dimethylpolysiloxane (dimethicone), dimethylpolysiloxane with hydroxyl end groups (dimethiconol), methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, polyether-modified silicone, highly polymerized silicone with an average degree of polymerization of 650 to 10,000, amino-modified silicone, betaine-modified silicone, alkyl-modified silicone, alkoxy-modified silicone, mercapto-modified silicone, carboxy-modified silicone, and fluorine-modified silicone. Preferred silicone oils are dimethylpolysiloxane and amino-modified silicone.

Specific examples of the above amino-modified silicones include aminopropylmethylsiloxane-dimethylsiloxane copolymer (aminopropyl dimethicone), aminoethylaminopropylsiloxane-dimethylsiloxane copolymer (amodimethicone), aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer (trimethylsilylamodimethicone), etc.

The content of the oil component in the mixture of the low-density composition and the high-density composition is not particularly limited, and is, for example, 0.1% by mass or more and 20.0% by mass or less. The lower limit is preferably 1.0% by mass or more, more preferably 2.0% by mass or more, even more preferably 2.5% by mass or more, and particularly preferably 2.8% by mass or more. On the other hand, the upper limit is preferably 18.0% by mass or less, more preferably 17.0% by mass or less, even more preferably 16.0% by mass or less, and particularly preferably 15.0% by mass or less. By setting it in the above range, the adhesion and uniform application can be further improved.

The content of the oil component in the low-density 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 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more. On the other hand, the upper limit is preferably 15.0% by mass or less, and more preferably 10.0% by mass or less.

The content of the oil component in the high-density composition is not particularly limited, and is, for example, 0.1% by mass or more and 20.0% by mass or less. The lower limit is preferably 0.5% by mass or more, and more preferably 1.0% by mass or more. On the other hand, the upper limit is preferably 18.0% by mass or less, more preferably 17.0% by mass or less, even more preferably 16.0% by mass or less, and particularly preferably 15.0% by mass or less.

<Foaming Agent>
The foaming agent is blended in the low-density composition, and may be any component that foams the low-density composition when discharged from a high-pressure environment such as an aerosol container into the usage environment of the hair cosmetic (usually at room temperature and atmospheric pressure), and examples of the foaming agent include liquefied natural gas (LPG), nitrogen gas, carbon dioxide gas, dimethyl ether, diethyl ether, propane, n-butane, isobutane, n-pentane, isopentane, hexane, trichlorotrifluoroethane, dichlorotetrafluoroethane, etc. From the viewpoint of excellent foaming power, liquefied natural gas and carbon dioxide gas are preferred.

<Other ingredients>
The low-density composition and high-density composition of the aerosol product of the present invention may contain, in addition to the above-mentioned components (A) to (D), an appropriate selection of the following, such as an alkaline agent, an oxidizing agent, a hydrogen peroxide stabilizer, a polyhydric alcohol, a polymeric compound, a peptide, an amino acid, a chelating agent, a pH adjuster, an oxidative dye, a direct dye, and water, as necessary.

(Alkaline agent)
The alkaline agent has the effect of swelling the hair and promoting the penetration of the dye or oxidizing agent, and is blended in the first agent. Examples of the alkaline agent include alkanolamines, ammonia, silicates, carbonates, hydrogencarbonates, metasilicates, phosphates, sulfates, chlorides, organic amines, basic amino acids, hydroxides of alkali metals or alkaline earth metals, etc. Specifically, examples of alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, aminomethylpropanol, isopropylamine, etc.; examples of silicates include sodium silicate, potassium silicate, etc.; examples of carbonates include sodium carbonate, ammonium carbonate, magnesium carbonate, guanidine carbonate, etc.; examples of hydrogencarbonates include sodium hydrogencarbonate, ammonium hydrogencarbonate, etc.; examples of metasilicates include sodium metasilicate, potassium metasilicate, etc.; examples of phosphates include primary ammonium phosphate. Examples of the basic amino acid include arginine, lysine and salts thereof, and examples of the hydroxides of alkali metals or alkaline earth metals include calcium hydroxide, magnesium hydroxide, sodium hydroxide, potassium hydroxide, etc. Particularly preferred are ammonium carbonate, ammonium hydrogen carbonate, ammonia, and monoethanolamine.

(Oxidizing Agent)
The oxidizing agent has the effect of oxidizing the oxidative dye to develop color, and of decomposing the melanin pigment inside the hair and the dye fixed in the hair by dyeing, and is blended into the second agent.
Specific examples of the oxidizing agent 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, hydrogen peroxide adducts of phosphates, hydrogen peroxide adducts of pyrophosphates, peracetic acid, performic acid, peracetates, performates, permanganates, and bromates. A preferred oxidizing agent is hydrogen peroxide from the viewpoint of excellent decolorization power for melanin pigments and dyes fixed in hair by hair dyeing.
These oxidizing agents may be used alone or in combination of two or more.

(Hydrogen peroxide stabilizer)
A hydrogen peroxide stabilizer is a compound that improves the stability of hydrogen peroxide when it is contained in the oxidizing agent-containing composition of the present invention.
Specific examples of hydrogen peroxide stabilizers include, for example, ethylene glycol phenyl ether (phenoxyethanol), tetrasodium salts of hydroxyethanediphosphonic acid, such as tetrasodium hydroxyethanediphosphonic acid and disodium hydroxyethanediphosphonic acid, and stannates, such as sodium stannate and potassium stannate.
These hydrogen peroxide stabilizers may be used alone or in combination of two or more.

(Polyhydric alcohol)
The polyhydric alcohol is an alcohol having a plurality of hydroxyl groups in the molecule, excluding the above-mentioned component (C). Examples of the polyhydric alcohol include glycol and glycerin.
Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol (eg, PEG 400, PEG 1000, PEG 1500, PEG 1540, etc.), polypropylene glycol, isoprene glycol, and 1,3-butylene glycol.
Specific examples of glycerin include glycerin, diglycerin, and polyglycerin.
These polyhydric alcohols may be used alone or in combination of two or more.

(Polymer Compound)
The polymer compound is a compound having a large molecular weight, and includes natural polymer compounds and synthetic polymer compounds. Examples of the polymer compound include cationic cellulose derivatives, diallyl quaternary ammonium salt polymers or copolymers, quaternary polyvinylpyrrolidone, cationic starch, and cationic guar gum.
These polymer compounds may be used alone or in combination of two or more.

Specific examples of cationic cellulose derivatives include polyquaternium-10 (e.g., Leoguard G (Lion Corporation)), which is a polymer of quaternary ammonium salt obtained by adding glycidyltrimethylammonium chloride to hydroxyethylcellulose; polyquaternium-4 (e.g., Cellcoat H-100 (National Starch and Chemical Co.)), which is hydroxyethylcellulose dimethyl diallyl ammonium chloride; and O-[2-hydroxy-3-(lauryldimethylammonio)propyl]hydroxyethylcellulose chloride.

Specific examples of polymers or copolymers of diallyl quaternary ammonium salts include polyquaternium-6, which is a dimethyldiallylammonium chloride polymer (polydimethylmethylenepiperidinium chloride) (e.g., Mercoat 100 (Nalco)), polyquaternium-22, which is a dimethyldiallylammonium chloride/acrylic acid copolymer (e.g., Mercoat 280 (Nalco)), polyquaternium-39, which is an acrylic acid/diallyl quaternary ammonium salt/acrylamide copolymer (e.g., Mercoat Plus 3331 (Nalco)), etc.).

Specific examples of quaternized polyvinylpyrrolidone include polyquaternium-11 (e.g., Gafcoat 734, Gafcoat 755 (both manufactured by ISP Japan)), which is a quaternary ammonium salt obtained from a copolymer of vinylpyrrolidone and dimethylaminoethyl methacrylate and diethyl sulfate.

Other examples of polymeric compounds include anionic polymers such as carboxyvinyl polymers, water-soluble polymers, etc. Specific examples of water-soluble polymers include plant polymers such as gum arabic, xanthan gum, carrageenan, pectin, agar, starch, and algae colloid (brown algae extract), microbial polymers such as dextran and pullulan, starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch, cellulose-based polymers such as methylcellulose, ethylcellulose, nitrocellulose, and hydroxyethylcellulose, alginic acid-based polymers such as sodium alginate, and vinyl-based polymers such as carboxyvinyl polymers.

(Peptides, amino acids)
Peptides and amino acids are organic compounds that contain both amino and carboxyl functional groups.
Specific examples of peptides and amino acids include animal proteins such as collagen, keratin, elastin, fibroin, silk, casein, and gelatin; proteins obtained from plants such as wheat, barley, oat, soybean, and almond; and proteins obtained by hydrolyzing these proteins with acids, alkalis, enzymes, etc.
These peptides and amino acids may be used alone or in combination of two or more.

(Chelating Agent)
A chelating agent has a ligand and binds to a metal ion.
Specific examples of chelating agents include ethylenediaminetetraacetic acid (EDTA, edetic acid), hydroxyethylethylenediaminetriacetic acid (HEDTA) and its salts, diethylenetriaminepentaacetic acid and its salts, and hydroxyethanediphosphonic acid (HEDP, etidronic acid) and its salts.
These chelating agents may be used alone or in combination of two or more.

(pH adjuster)
The pH adjuster is used to adjust the pH of the composition, and is composed of an acid component which is an inorganic acid or an organic acid, and an alkali component which is an inorganic alkali or an organic alkali.

Specific examples of organic acids include hydroxycarboxylic acids such as glycolic acid, lactic acid, malic acid, citric acid, and tartaric acid, and dicarboxylic acids such as succinic acid.
Specific examples of organic alkalis include volatile alkaline components such as morpholine, alkanolamines such as monoethanolamine, aminoalcohols such as 2-amino-2-methyl-1-propanol, and basic amino acids such as L-arginine, L-lysine, and L-histidine.

(Oxidation dyes)
Oxidation dyes are dyes that develop color through oxidative polymerization in the presence of an oxidizing agent, and are blended into the first agent. Oxidation dyes include dye intermediates and couplers. Dye intermediates are substances that develop color through their own oxidation, and couplers are substances that can be combined with dye intermediates to produce a variety of colors.
Dye intermediates are dye precursors which are mainly o- or p-phenylenediamines or aminophenols and are usually themselves colorless or weakly colored compounds.
Specific examples include p-phenylenediamine, toluene-2,5-diamine (p-toluylenediamine), N-phenyl-p-phenylenediamine, 4,4'-diaminodiphenylamine, p-aminophenol, o-aminophenol, p-methylaminophenol, N,N-bis(2-hydroxyethyl)-p-phenylenediamine, 2-hydroxyethyl-p-phenylenediamine, o-chloro-p-phenylenediamine, 4-amino-m-cresol, 2-amino-4-hydroxyethylaminoanisole, 2,4-diaminophenol, 2,2'-[(4-aminophenyl)imino]bisethanol, etc. One or more types of dye intermediates can be selected and used depending on the desired hair color tone.
The coupler mainly includes m-diamines, aminophenols, and salts of diphenols. Specific examples include 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, resorcin, catechol, pyrogallol, phloroglucin, gallic acid, hydroquinone, α-naphthol, phenylmethylpyrazolone, 3,3'-iminodiphenyl, 1,5-dihydroxynaphthalene, tannic acid, 5,6-dihydroxyindoline, and 5,6-dihydroxyindole. One or more couplers can be selected and used according to the desired hair color tone.

(Direct dyes)
The direct dye is a compound having a color, and is not particularly limited as long as it adheres to or penetrates into hair to dye it. Examples of the direct dye include acid dyes, basic dyes, natural dyes, nitro dyes, HC dyes, and disperse dyes.
These direct dyes may be used alone or in combination of two or more depending on the desired hair color tone.

(others)
The low-density composition and high-density composition of the aerosol product of the present invention may further contain at least one selected from antioxidants (e.g., ascorbic acid, anhydrous sodium sulfite, etc.), preservatives (e.g., sodium benzoate, etc.), organic solvents (e.g., ethanol, etc.), sugars (e.g., sorbitol, maltose, etc.), stabilizers (e.g., phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, tannic acid, etc.), inorganic salts (e.g., sodium chloride, sodium carbonate, etc.), buffers (sodium phosphate, etc.), plant extracts, herbal extracts, vitamins, fragrances, ultraviolet absorbers, and those listed in the "Standards for Quasi-Drug Raw Materials" (published in June 2006 by Yakuji Nipposha).

The following provides examples of the aerosol product of the present invention to further explain the present invention in detail, but the present invention is not limited to these examples.

The foams and creams of the present invention according to the examples and comparative examples were obtained with the contents shown in Table 1. The foaming ratio, adhesion, and uniform application of these were evaluated according to the following evaluation criteria. The results are shown in Table 1. The foaming ratio was adjusted by changing the LPG pressure.

<Method of measuring foaming ratio>
The foam and cream were discharged from the aerosol into a cup, immediately mixed, and transferred to a 20 mL hemispherical plastic container. Immediately after the mixture was filled to the brim, the mass of the foam after mixing was measured and the foaming ratio was calculated using the following formula. The mixing was performed using a brush attached to a Bigen Cream Tone (trade name) manufactured by Hoyu Corporation, and by hand, stirring 15 times at the same speed in 10 seconds, drawing a circle with a diameter of approximately 5 cm.
Foaming ratio = 20 mL / [mass of foam after mixing (g) / specific gravity of stock solution after mixing (g/mL)]

<Method for evaluating adhesion>
Both agents were dispensed onto the palm of the hand and applied to a black wig (Beulax Co., Ltd., Queen Cut No. 775S) by hand. Ten panelists observed the condition of the mixture at the roots of the hair immediately after application and 5 minutes later, and rated according to the following criteria.
The condition was rated on a 5-point scale: excellent (5 points) when the same amount of the mixture remained at the root of the hair as immediately after application; good (4 points) when the mixture had flowed slightly compared to immediately after application but remained at the root of the hair; fair (3 points) when the mixture had flowed more compared to immediately after application but remained at the root of the hair; slightly poor (2 points) when the mixture had flowed more compared to immediately after application and barely remained at the root of the hair; and poor (1 point) when the mixture did not remain at the root of the hair and dripped off the hair.
The scores of each panelist were averaged, and the results were evaluated as follows: 4.6 points or more was "excellent: 5", 3.6 points or more but less than 4.6 points was "good: 4", 2.6 points or more but less than 3.6 points was "fair: 3", 1.6 points or more but less than 2.6 points was "slightly poor: 2", and less than 1.6 points was "poor: 1". The results are shown in the "Adhesion" column of Table 1.

<Method for evaluating uniform coating property>
5g of foam and 4g of cream were discharged, and an oxidative hair dye was applied to a black wig (Beulax Co., Ltd. Queen Cut No. 775S) in an amount three times the weight of the black wig using a brush (bath ratio 1:3), and the wig was left for 30 minutes at 30°C. After leaving the wig, the black wig was washed with water and then washed with shampoo to wash away the oxidative hair dye. Next, a conditioner was applied to the black wig. After rinsing the black wig to wash away the conditioner, the black wig was wiped dry with a towel and finally dried with a hair dryer.
The degree of color unevenness of the dyed black wig was visually observed by 10 panelists, and the presence or absence of color unevenness was evaluated (sensory evaluation).
Specifically, "evenly dyed" was given a rating of "5", "almost evenly dyed" was given a rating of "4", "some unevenness but within an acceptable range" was given a rating of "3", "lots of unevenness" was given a rating of "2", and "very much unevenness" was given a rating of "1".
The average score of each panelist was calculated, and the evaluation results were determined as follows: an average score of 4.6 points or more was designated as "excellent: 5", an average score of 3.6 points or more but less than 4.6 points was designated as "good: 4", an average score of 2.6 points or more but less than 3.6 points was designated as "fair: 3", an average score of 1.6 points or more but less than 2.6 points was designated as "slightly poor: 2", and an average score of less than 1.6 points was designated as "poor: 1".

As shown in Table 1, the aerosol products of the present invention in the examples were rated as excellent in terms of adhesion and uniform application of the oxidative hair dye mixture when the foaming ratio of the mixture of the first and second agents was 2 to 30 times (for example, comparing the oxidative hair dyes of Examples 1-1 to 1-3 and Examples 2-1 to 2-3 with the oxidative hair dyes of Comparative Examples 1-1 to 1-2 and Comparative Examples 2-1 to 2-2).
When comparing the oxidative hair dyes of Examples 1-1 to 1-3 and Examples 2-1 to 2-3 with the oxidative hair dyes of Examples 1-4 and 2-4, it can be seen that when an ionic surfactant is added, the adhesion and uniform mixing of the mixture are improved.
Comparing the oxidative hair dye compositions of Examples 1-1 and 2-1 with the oxidative hair dye compositions of Examples 1-5 to 1-6 and Examples 2-5 to 2-6, it can be seen that the adhesion and uniform mixing of the mixture is improved when higher alcohols or oily components are added.

The aerosol product of the present invention can be used, for example, in hair cosmetics such as hair dyes, bleaches, and hair styling products, and external cosmetics such as hair removal creams and shaving gels. More preferably, it can be used, for example, in oxidation hair dyes comprising a first agent containing an alkaline agent and a second agent containing an oxidizing agent.

Claims (4)

An aerosol product using a mixture of two or more agents,
a low density composition in which one or more agents foam upon expulsion from an aerosol container;
An aerosol product, characterized in that the mixture of two or more agents has an expansion ratio of 2 to 30 times. the two or more agents include the low density composition and the high density composition;
The low-density composition has a density of 0.01 g/mL or more and 0.30 g/mL or less at 25° C.,
2. The aerosol product of claim 1, wherein the high density composition has a density at 25°C of greater than 0.30 g/mL and less than or equal to 1.5 g/mL. The aerosol product according to claim 1 or 2, characterized in that the two or more agents each contain (A) a nonionic surfactant and (B) a higher alcohol. The aerosol product according to claim 1 or 2, characterized in that the two or more agents contain (C) an ionic surfactant.