Aerosol product

Abstract

The present invention addresses the problem of providing an aerosol product that is used by mixing a low-density composition and a high-density composition, and that provides an excellent use experience during or after application thereof to hair.　To solve the problem, the present invention provides an aerosol product that is used by mixing a low-density composition and a high-density composition. The low-density composition and / or the high-density composition contains (A) a nonionic surfactant and (B) an ionic surfactant. The density of the low-density composition is 0.01-0.30 g / mL at 25°C, and the density of the high-density composition is more than 0.30 g / mL but not more than 1.5 g / mL at 25°C.

Description

aerosol products

[0001] The present invention relates to an aerosol product that uses a mixture of a low density composition and a high density composition.

[0002] Conventionally, aerosol products using a mixture of two types of ejection materials have been known. The ejection materials include creams and foams. Creams have the advantage of being highly adhesive to hair and less likely to drip, but they tend to be less easily applied to hair than foams and are therefore less uniformly applied. Foams also have the advantage of being easily applied to hair, but tend to be less easily adhered to hair than creams. To achieve both of these advantages, aerosol products using a cream and a foam as the two types of ejection materials have been investigated. For example, Patent Document 1 discloses a two-liquid aerosol product that ejects two types of aerosol compositions, where one ejection material is surrounded by the other ejection material to form a double ejection material, with the inner ejection material having a lower density than the outer ejection material. Furthermore, Patent Document 2 discloses an aerosol product for dispensing two liquids, which comprises a container body having a first container filled with a foamable composition and a second container filled with a viscous concentrate, a valve mechanism attached to the container body, which is formed with 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, 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 portion of the foamable composition.

[0003] JP 2015-163658 A JP 2017-001692 A

[0004] In the conventional aerosol products disclosed in Patent Documents 1 and 2, by mixing a low-density composition with a high-density composition, it is possible to obtain an aerosol product that combines the adhesion to hair of a high-density composition and the ease of application to hair of a low-density composition. However, there is a problem in that the feel when applied to hair (when applied to hair) and after application (for example, adhesion and penetration to hair, presence or absence of unevenness during application, spreadability during application, etc.) is insufficient.

[0005] Therefore, an object of the present invention is to provide an aerosol product that uses a mixture of a low-density composition and a high-density composition, and that has an excellent feel when applied to hair and after application.

[0006] As a result of intensive research into the above-mentioned problems, the present inventors have discovered that in an aerosol product using a mixture of a low-density composition and a high-density composition, by including (A) a nonionic surfactant and (B) an ionic surfactant in both the low-density composition and / or the high-density composition, an aerosol product that provides an excellent feel when applied to hair and after application can be obtained, and have completed the present invention.

[0007] The aerosol product of the present invention, which solves the above-mentioned problems, is an aerosol product that uses a mixture of a low-density composition and a high-density composition, wherein the low-density composition and the high-density composition contain (A) a nonionic surfactant and (B) an ionic surfactant, and the low-density composition has a density of 0.01 g / mL or more and 0.30 g / mL or less at 25°C, and the high-density composition has a density of more than 0.30 g / mL and 1.5 g / mL or less at 25°C. The aerosol product of the present invention can provide an aerosol product that provides an excellent feel when applied to hair and after application. In particular, an aerosol product can be provided that reduces unevenness in the amount of application and provides excellent uniform application (hereinafter also referred to as "uniform application") when applied to hair (when applied to hair). Furthermore, it is also possible to provide an aerosol product that selectively and significantly exhibits superior usability (e.g., adhesion and penetration to hair, spreadability upon application, etc.) depending on the type of ionic surfactant used (cationic surfactant, anionic surfactant, amphoteric surfactant).

[0008] In one embodiment of the aerosol product of the present invention, the low-density composition is a foam and the high-density composition is a cream, which provides an aerosol product that is particularly excellent in terms of feel during and after application to hair.

[0009] In one embodiment of the aerosol product of the present invention, the low-density composition and / or the high-density composition contains a higher alcohol (C). This feature makes it possible to provide an aerosol product that is particularly excellent in terms of feel during and after application to hair.

[0010] In one embodiment of the aerosol product of the present invention, the low-density composition and / or the high-density composition contains an oily component (D), and the content of the oily component (D) (excluding component (C)) in the mixture of the low-density composition and the high-density composition is 2.5 mass % or more. This feature makes it possible to provide an aerosol product that is particularly excellent in terms of feel during and after application to hair.

[0011] According to the present invention, an aerosol product can be provided that uses a mixture of a low-density composition and a high-density composition, and that provides an excellent feel when applied to hair and after application.

[0012] The present invention relates to an aerosol product that uses a mixture of a low-density composition and a high-density composition. According to the aerosol product of the present invention, by including (A) a nonionic surfactant and (B) an ionic surfactant in both or either of the low-density composition and the high-density composition, it is possible to provide an aerosol product that provides an excellent feel during and after application to hair. The nonionic surfactant (A) and the ionic surfactant (B) may be separately included in either the low-density composition or the high-density composition, or both the nonionic surfactant (A) and the ionic surfactant (B) may be included in either the low-density composition or the high-density composition.

[0013] Hereinafter, embodiments of the aerosol product according to the present invention will be described in detail. Note that the aerosol product described in this embodiment is merely an example for explaining the present invention, and is not limited thereto. Furthermore, in the description of the technical features of each component in this specification, unless a description is made to specify a low-density composition or a high-density composition, the technical features apply to both the low-density composition and the high-density composition.

[0014] [Aerosol Product] An aerosol product is a product that uses a mixture of two or more compositions dispensed from an aerosol container. The aerosol product of the present invention comprises a low-density composition and a high-density composition as the two or more compositions dispensed from the aerosol container, the low-density composition having a density of 0.01 g / mL or more and 0.30 g / mL or less at 25°C, and the high-density composition having a density of more than 0.30 g / mL and 1.5 g / mL or less at 25°C. The aerosol product may be composed of not only two types of compositions, but also three or more types of compositions, such as a low-density composition + a low-density composition + a high-density composition, or a low-density composition + a high-density composition + a high-density composition.

[0015] 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. The specific dosage form is not particularly limited, but may be, for example, a foaming agent. The foaming agent may be one that foams using a foaming gas or the like during or after ejection, and may be one that foams immediately after ejection using a foaming agent such as liquefied petroleum gas (LPG), or one that foams after ejection using a post-foaming agent such as isopentane. The composition before ejection (before foaming) may be a liquid composition, an emulsion composition, a gel composition, or a cream composition.

[0016] 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. Specific dosage forms are not particularly limited, but include, for example, creams, gels, liquids, and emulsions. Preferred dosage forms of the high-density composition are creams and gels. The composition before ejection may be the same as that after ejection, and may be a cream composition, gel composition, liquid composition, or emulsion composition, or the state may change within the above density range after ejection.

[0017] 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 dosage forms, and preferably 3,000 to 50,000 mPa·s at 25°C for cream and gel dosage forms.

[0018] 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.

[0019] The density at 25°C is measured by discharging the low-density composition or high-density composition into a 100 mL volumetric cup whose weight has been measured in advance until it overflows, and immediately after discharging, preferably after 1 minute, the overflowing composition is leveled off at the top of the 100 mL volumetric cup, and the weight of the low-density composition or high-density composition per 100 mL volume is measured.

[0020] The aerosol product has an aerosol container filled with compositions that become low-density and high-density compositions after ejection, and an ejection port that ejects the low-density and high-density compositions separately. The aerosol container may be a double aerosol container in which the low-density and high-density compositions are filled in separate containers, or a single aerosol container in which the high-density composition filled in an inner bag is placed inside a container containing the low-density composition. The low-density and high-density compositions may be ejected simultaneously or separately. From the perspective of making ejection easier for the user, it is preferable that the low-density and high-density compositions be ejected simultaneously with a single ejection operation. Furthermore, the timing of mixing may be simultaneous with ejection or after ejection.

[0021] From the viewpoint of improving the simultaneous penetration of the low-density composition and the high-density composition, the aerosol product may be ejected so that the low-density composition and the high-density composition come into contact during or after ejection. The arrangement of the low-density composition and the high-density composition after ejection is not particularly limited. For example, the low-density composition (e.g., foam) and the high-density composition (e.g., cream) may be arranged vertically or horizontally in a two-layer structure, or a double-cylindrical structure in which the low-density composition and the high-density composition are arranged inside and outside. From the viewpoint of excellent simultaneous penetration, in the case of a two-layer structure, it is preferable that the lower layer is the low-density composition and the upper layer is the high-density composition. In the case of a double-cylindrical structure, it is preferable that the inner layer is the low-density composition and the outer layer is the high-density composition. When three or more compositions are used, a multi-layer or multi-layered cylindrical structure may be used. For example, a three-layer structure with a lower layer being a foam, a middle layer being a foam, and an upper layer being a cream, or a triple-cylindrical structure with an innermost layer being a foam, a middle layer being a foam, and an outermost layer being a cream, may be used.

[0022] The uses of the aerosol product of the present invention are not particularly limited as long as it is a product that uses a mixture of two or more compositions, but examples include hair cosmetics such as hair dyes, bleaches, and hair styling products, and topical cosmetics such as hair removal creams and shaving gels. From the perspective of further demonstrating the effects of the present invention, such as excellent adhesion to hair and uniform application, it is preferable to use it in oxidative hair dyes or bleaching / decoloring agents that include a first agent containing an alkaline agent and a second agent containing an oxidizing agent, or other two-part hair coloring compositions (hair dyes, color treatments, color shampoos, etc.). When used in oxidative hair dyes or bleaching / decoloring agents, it is possible to obtain the effects of excellent hair dyeing power (bleaching power) and dye levelness (uniform bleaching). Furthermore, when used in oxidative hair dyes or bleaching / decoloring agents, it is preferable to use a foam as the first agent and a cream as the second agent.

[0023] [Low-density composition, high-density composition] The aerosol product of the present invention is characterized in that both the low-density composition and the high-density composition contain (A) a nonionic surfactant and (B) an ionic surfactant. Note that, although the components used in the low-density composition and the high-density composition will be explained below, unless otherwise specified, the explanation applies to both the low-density composition and the high-density composition.

[0024] <(A) Nonionic Surfactant> A 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. The inclusion of the nonionic surfactant improves the emulsion stability of the low-density composition and the high-density composition.

[0025] 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, lecithin derivatives, hydrogenated soybean lecithin, etc. Ether-type nonionic surfactants are preferred.

[0026] 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.

[0027] 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.

[0028] 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 exceeding 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 exceeding 10.0. The use of these nonionic surfactants can further enhance the effects of the present invention.

[0029] The HLB values ​​used in the present invention are measured values. The HLB value was proposed by W. C. Griffin and is a numerical value assigned 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. The HLB value is a measured value calculated from the emulsification method (see "Handbook - Cosmetics and Pharmaceutical Raw Materials" by Nikko Chemicals Co., Ltd. (revised edition published February 1, 1977)). To measure the measured HLB value, a combination of sorbitan monostearate (e.g., NIKKOL SS-10 manufactured by Nikko Chemicals, HLB value 4.7) and polyoxyethylene sorbitan monostearate (e.g., NIKKOL TS-10 manufactured by Nikko Chemicals, HLB value 14.9) is used as a surfactant standard substance. Liquid paraffin is used as the emulsified substance. If variations in the liquid paraffin type or lot are expected, the HLB value is measured each time. Liquid paraffin is emulsified with the above two surfactants to determine the optimum surfactant ratio, and the required HLB value of the liquid paraffin (the HLB value to be emulsified) is calculated using the formula shown in Equation (1).

[0030]

[0031] The required HLB value of liquid paraffin is usually about 10.1 to 10.3, depending on the type and lot. Next, the HLB value of an unknown surfactant is measured using liquid paraffin for which the required HLB value has been 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 used as x to calculate the HLB value by applying it to the above formula (1).

[0032] 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 it within these ranges, the effect of even better emulsion stability can be obtained.

[0033] 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 even better emulsion stability can be obtained.

[0034] In the aerosol product of the present invention, the difference between the content of nonionic surfactant in the low-density composition and the content of nonionic surfactant in 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 keeping the difference in nonionic surfactant content within this range, the effects of further improving adhesion, uniform application, and mixability are observed.

[0035] 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 it within these ranges, the effect of even better adhesion and uniform coating properties can be obtained.

[0036] <(B) Ionic Surfactant> Ionic surfactants are surfactants having a hydrophilic group that dissociates ionically upon dissolving in water, and include anionic surfactants, cationic surfactants, and amphoteric surfactants. In the aerosol product of the present invention, the ionic surfactant may be contained in either the low-density composition or the high-density composition, and it is more preferable that the ionic surfactant be contained in both the low-density composition and the high-density composition. By containing the ionic surfactant in both the low-density composition and the high-density composition, an aerosol product can be provided that has excellent miscibility between the low-density composition and the high-density composition, as well as excellent adhesion and penetration to hair, spreadability upon application (hereinafter also referred to as "extension"), and uniform application.

[0037] 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 feel during application to hair and after application, including uniform application, can be further improved.

[0038] 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 feel during application to hair and after application, including uniform application, can be further improved.

[0039] 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 feel during and after application to hair, including uniform application, can be further improved.

[0040] Hereinafter, surfactants that can be used as the ionic surfactant, component (B) of the present invention, will be described along with specific examples.

[0041] ((B1) Cationic Surfactant) A cationic surfactant is a surfactant 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; amine salts such as alkylamine salts, fatty acid amidoamine salts, ester-containing tertiary amine salts, and Arcobel tertiary amine salts; cyclic quaternary ammonium salts such as alkylpyridinium salts and alkylisoquinolium salts; and benzethonium chloride. From the viewpoint of further 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.

[0042] 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.

[0043] 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 blended alone or in combination of two or more.

[0044] Inclusion of a cationic surfactant in either the low-density composition, the high-density composition, or both has the effect of providing excellent uniform application to hair. Furthermore, the adhesion of a mixture of the low-density composition and the high-density composition to hair is improved. Furthermore, when a cationic surfactant is contained in the foam agent as the low-density composition, the foam texture of the foam agent becomes finer, improving foam stability, and further improving the uniform application and adhesion of the mixture with the high-density composition to hair. Inclusion of a cationic surfactant in the high-density composition improves the uniform application and adhesion of the mixture with the low-density composition to hair. It is more preferable to contain a cationic surfactant in both the low-density composition and the high-density composition, which can further improve the simultaneous penetration of the low-density composition and the high-density composition, and the adhesion of the mixture of the low-density composition and the high-density composition to hair.

[0045] When a cationic surfactant is used as the ionic surfactant of the present invention, the content of the cationic 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 10.0% by mass or less. The lower limit is preferably 0.03% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% 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. By setting the content within this range, the texture of the foam of the foaming agent becomes finer, further improving the foam stability, and further improving the uniform application properties of the mixture with the high-density composition and the adhesion to hair.

[0046] Furthermore, when a cationic surfactant is used as the ionic surfactant of the present invention, the content of the cationic 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 10.0% by mass or less. The lower limit is preferably 0.03% by mass or more, 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. By setting the content within this range, the uniform application property of the mixture with the low-density composition and the adhesion to hair are further improved.

[0047] Furthermore, when a cationic surfactant is used as the ionic surfactant of the present invention, the content of the cationic 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 10.0% by mass or less. The lower limit is preferably 0.03% by mass or more, 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. By setting the content within this range, the uniform application property and adhesion to hair of the mixture of the low-density composition and the high-density composition are further improved.

[0048] ((B2) 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, phosphate monoester surfactants, phosphate diester surfactants, and sulfosuccinate esters. Preferred are 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.

[0049] 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, polyoxyethylene lauryl ether sodium sulfate, polyoxyethylene lauryl ether triethanolamine sulfate, polyoxyethylene lauryl ether ammonium sulfate, polyoxyethylene stearyl ether sodium sulfate (sodium laureth sulfate), polyoxyethylene lauryl ether sodium acetate, polyoxyethylene lauryl ether phosphate, polyoxyethylene lauryl ether phosphate, disodium lauryl sulfosuccinate, sodium N-stearoyl-N-methyl taurate, triethanolamine dodecylbenzenesulfonate, sodium tetradecenesulfonate, sodium lauryl phosphate, N-lauroyl glutamates such as sodium lauroyl glutamate, N-lauroylmethyl-β-alanine salt, N-acylglycine salt, and N-acylglutamate. Preferred are sodium lauryl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, polyoxyethylene lauryl ether sodium 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.

[0050] The anionic surfactant can be contained in both or either one of the low-density composition and the high-density composition. As a result, a mixture of the low-density composition and the high-density composition not only has the adhesion to hair of the high-density composition and the applicability to hair of the low-density composition, but also has good spreadability (extendability) during application, excellent operability during application, and particularly excellent uniform application properties.

[0051] When an anionic surfactant is used as the ionic surfactant of the present invention, the content of the anionic 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 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, it is possible to further improve the elongation (extendability) when applied to hair.

[0052] (B3) Amphoteric Surfactant) An amphoteric surfactant is a surfactant in which a 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 or both of the low-density composition and the high-density composition. By containing an amphoteric surfactant in the low-density composition and / or the high-density composition, an aerosol product that has excellent affinity to hair can be provided. In the present invention, "affinity (to hair)" refers to the ease of penetration into the entire head of hair.

[0053] Specific examples of amino acid type amphoteric surfactants include 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' 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 lauroylamphoacetate), 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, and sodium laurylaminodipropionate.

[0054] Specific examples of betaine-type amphoteric surfactants include aminoacetic acid betaine-type amphoteric surfactants such as coconut oil alkyl betaine, lauryl dimethylaminoacetic acid betaine, myristyl dimethylaminoacetic acid betaine, stearyl dimethylaminoacetic acid 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 dimethylaminoacetic acid betaine and coconut oil fatty acid amidopropyl betaine are particularly preferred. These amphoteric surfactants may be blended alone or in combination of two or more.

[0055] The amphoteric surfactant can be contained in both or either one of the low-density composition and the high-density composition. This can enhance the defoaming properties of the low-density composition when the low-density composition and the high-density composition are mixed. The defoaming properties improve penetration into hair when applied to hair, resulting in good compatibility with hair. From the viewpoint of enhancing defoaming properties, it is preferable to contain a cationic surfactant in a composition separate from the composition containing the amphoteric surfactant. In alkaline compositions, the amphoteric surfactant has anionic properties, so it can form a complex with the cationic surfactant and exhibit appropriate defoaming properties. Furthermore, by containing an amphoteric surfactant, the mixture of the low-density composition and the high-density composition not only has the adhesion to hair of the high-density composition and the applicability to hair of the low-density composition, but also exhibits excellent compatibility with hair.

[0056] When an amphoteric surfactant is used as the ionic surfactant of the present invention, the content of the amphoteric 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 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. 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, compatibility with hair and uniform application can be further improved.

[0057] <(C) Higher Alcohol> A 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 number of carbon atoms in the higher alcohol is preferably 12 or more and 22 or less. The number of hydroxyl groups in the higher alcohol is not particularly limited, and the higher alcohol may be a polyhydric alcohol having multiple hydroxyl groups, but is preferably a monohydric alcohol. Furthermore, 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.

[0058] 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, cholesterol, etc. Preferred higher alcohols contained in low-density compositions (e.g., foaming agents) are myristyl alcohol and cetyl alcohol (cetanol), and preferred higher alcohols contained in high-density compositions (e.g., creams) are stearyl alcohol, arachyl alcohol and behenyl alcohol.

[0059] The higher alcohol can be contained in both or either of the low-density composition and the high-density composition. The inclusion of a higher alcohol improves the feel during and after application to hair, particularly the adhesion and penetration into hair, spreadability, and uniform application. Furthermore, when the low-density composition contains a higher alcohol, a thick foam is obtained, and foam stability is improved. Furthermore, the effect of the mixture with the high-density composition on hair (adhesion to hair, compatibility with hair, etc.) is improved, and spreadability and uniform application are also improved. Furthermore, when the high-density composition contains a higher alcohol, emulsion stability is improved, and the effect of the mixture with the low-density composition on hair is improved, and spreadability and uniform application are also improved. Furthermore, when a higher alcohol is contained in both the low-density composition and the high-density composition, simultaneous penetration of the low-density composition and the high-density composition is improved, and the adhesion to hair and uniform application of the mixture can be further improved.

[0060] 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, more preferably 5.0% by mass or less. By setting the content of the higher alcohol in the low-density composition within the above range, a thick foam can be obtained and foam stability can be improved, and further, the effect of the mixture with the high-density composition on hair (adhesion to hair, compatibility with hair, etc.) can be improved, and spreadability and uniform application can also be improved.

[0061] 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 the higher alcohol in the high-density composition within the above range, emulsion stability is improved, and further, the effect on hair of the mixture with the low-density composition (adhesion to hair, familiarity with hair, etc.) is improved, and spreadability and uniform application are also improved.

[0062] In the aerosol product of the present invention, the difference between the higher alcohol content of the low-density composition and the higher alcohol content of the high-density composition is preferably 5.0% by mass or less, more preferably 4.5% by mass or less. By keeping the difference in the higher alcohol content within this range, the effects of improving adhesion, uniform application, and mixability are observed.

[0063] The content of higher alcohol 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 0.1% 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 within the above range, the feel during and after application to hair, particularly the uniform application property, can be improved.

[0064] <(D) Oily Component> The oily component is a liquid or solid oily component excluding the higher alcohol of component (C). Examples of oily components include hydrocarbon oils, fats and oils, higher fatty acids, waxes, alkyl glyceryl ethers, ester oils, and silicone oils. Hydrocarbon oils, fats and oils, and ester oils are preferred, and oily components that are liquid at 25°C are more preferred. These oily components may be blended alone or in combination of two or more.

[0065] The oily component can be contained in both or either one of the low-density composition and the high-density composition. By containing the oily component, the action and effect on hair of the mixture of the low-density composition and the high-density composition (adhesion to hair, compatibility with hair, etc.) can be improved, and the spreadability and uniform application can also be further improved.

[0066] Hydrocarbons are compounds composed 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 particularly preferred is liquid paraffin.

[0067] 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, Job's tears oil, grape seed oil, avocado oil, carrot oil, castor oil, linseed oil, palm 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.

[0068] The higher fatty acid is an aliphatic carboxylic acid having 6 or more carbon atoms. The number of carbon atoms in the higher fatty acid is not particularly limited and may be, 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. 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, and lanolin fatty acid. Preferred higher fatty acids are stearic acid and oleic acid.

[0069] Waxes are esters of higher fatty acids and higher alcohols. Specific examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, spermaceti, rice bran wax, sugarcane wax, palm wax, montan wax, cotton wax, bayberry wax, privet wax, kapok wax, and shellac wax. Preferred waxes are beeswax, jojoba oil, and lanolin.

[0070] Specific examples of alkyl glyceryl ethers include batyl alcohol, chimyl alcohol, selachyl alcohol, isostearyl glyceryl ether, etc. A preferred alkyl glyceryl ether is batyl alcohol.

[0071] Ester oils are compounds obtained by a dehydration reaction between 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 esters. Examples of ester oils include isocetyl phosphate, hexyl laurate, decyl oleate, C10-30 fatty acids (cholesteryl / lanosteryl), lauryl lactate, octyldodecyl lactate, octyldodecyl ricinoleate, cetyl lactate, lanolin acetate, pentaerythritol fatty acid esters, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, cetyl caprate, glyceryl tricaprylate, diisostearyl malate, dioctyl succinate, and hydrogenated castor oil isostearate. A preferred ester oil is cetyl ethylhexanoate.

[0072] Silicone oil is a synthetic polymer in which silicon and oxygen atoms with organic groups are alternately linked by chemical bonds.Specific examples of silicone oil include dimethylpolysiloxane (dimethicone), dimethylpolysiloxane (dimethiconol) with hydroxyl terminal groups, methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, polyether-modified silicone, highly polymerized silicone with an average degree of polymerization of 650 or more and 10,000 or less, 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.

[0073] Specific examples of the amino-modified silicone include aminopropylmethylsiloxane-dimethylsiloxane copolymer (aminopropyl dimethicone), aminoethylaminopropylsiloxane-dimethylsiloxane copolymer (amodimethicone), and aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer (trimethylsilyl amodimethicone).

[0074] The content of the oily 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 the content within the above range, the effect on hair (adhesion to hair, compatibility with hair, etc.) is improved, and the spreadability and uniform application ability can also be further improved.

[0075] The content of the oily 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.

[0076] The content of the oily 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, 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.

[0077] <Foaming Agent> The foaming agent is blended into 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 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.

[0078] <Other Components> The low-density composition and high-density composition of the aerosol product of the present invention may contain, as necessary, the above-mentioned foaming agent and other components in addition to the above-mentioned components (A) to (D). Examples of other components that may be included include, for example, the following, appropriately selected and included: alkaline agents, oxidizing agents, hydrogen peroxide stabilizers, polyhydric alcohols, polymeric compounds, peptides, amino acids, chelating agents, pH adjusters, oxidative dyes, direct dyes, and water.

[0079] (Alkaline Agent) The alkaline agent has the effect of swelling the hair and promoting the penetration of dyes and oxidizing agents, and is incorporated into the first agent. Examples of alkaline agents include alkanolamines, ammonia, silicates, carbonates, bicarbonates, metasilicates, phosphates, sulfates, chlorides, organic amines, basic amino acids, and hydroxides of alkali metals or alkaline earth metals. Specific examples of alkanolamines include monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, aminomethylpropanol, and isopropylamine. Examples of silicates include sodium silicate and potassium silicate. Examples of carbonates include sodium carbonate, ammonium carbonate, magnesium carbonate, and guanidine carbonate. Examples of bicarbonates include sodium bicarbonate and ammonium bicarbonate. Examples of metasilicates include sodium metasilicate and potassium metasilicate. Examples of phosphates include monoammonium phosphate. Examples of the basic amino acid include arginine, lysine, and salts thereof. Examples of the alkali metal or alkaline earth metal hydroxide include calcium hydroxide, magnesium hydroxide, sodium hydroxide, potassium hydroxide, etc. Particularly preferred are ammonium carbonate, ammonium hydrogen carbonate, ammonia, and monoethanolamine.

[0080] (Oxidizing Agent) The oxidizing agent has the effect of oxidizing the oxidation dye to develop color and decomposing the melanin pigment inside the hair and the dye fixed in the hair by hair dyeing, and is incorporated 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. The preferred oxidizing agent is hydrogen peroxide, from the viewpoint of its excellent decolorizing power for melanin pigments and dyes fixed in the hair by hair dyeing. These oxidizing agents may be used alone or in combination of two or more.

[0081] (Hydrogen Peroxide Stabilizer) A hydrogen peroxide stabilizer is a compound that improves the stability of the composition of the present invention (low-density composition and / or high-density composition) when the composition contains an oxidizing agent and further contains hydrogen peroxide. Specific examples of hydrogen peroxide stabilizers include ethylene glycol phenyl ether (phenoxyethanol), tetrasodium hydroxyethanediphosphonate such as tetrasodium hydroxyethanediphosphonate and disodium hydroxyethanediphosphonate, and stannates such as sodium stannate and potassium stannate. These hydrogen peroxide stabilizers may be used alone or in combination of two or more.

[0082] (Polyhydric Alcohol) The polyhydric alcohol is an alcohol having multiple hydroxyl groups in the molecule, excluding the above-mentioned component (C). Examples of polyhydric alcohols include glycol and glycerin. Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol (e.g., 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 blended alone or in combination of two or more.

[0083] (Polymer Compound) Polymer compounds are compounds with large molecular weights, and include natural polymer compounds and synthetic polymer compounds. Examples of polymer compounds include cationic cellulose derivatives, diallyl quaternary ammonium salt polymers or copolymers, quaternized polyvinylpyrrolidone, cationic starch, and cationic guar gum. These polymer compounds may be blended alone or in combination of two or more.

[0084] Specific examples of cationized cellulose derivatives include polyquaternium-10 (e.g., Leoguard G (Lion Corporation)), which is a polymer of a quaternary ammonium salt obtained by adding glycidyltrimethylammonium chloride to hydroxyethyl cellulose; polyquaternium-4 (e.g., Cellcoat H-100 (National Starch and Chemical Co.)), which is a hydroxyethyl cellulose dimethyl diallyl ammonium chloride; and O-[2-hydroxy-3-(lauryldimethylammonio)propyl]hydroxyethyl cellulose chloride.

[0085] Specific examples of the polymer or copolymer of a diallyl quaternary ammonium salt include Polyquaternium-6, which is a dimethyldiallylammonium chloride polymer (polydimethylmethylenepiperidinium chloride) (e.g., Merquat 100 (Nalco)), etc.), Polyquaternium-22, which is a dimethyldiallylammonium chloride / acrylic acid copolymer (e.g., Merquat 280 (Nalco)), etc.), and Polyquaternium-39, which is an acrylic acid / diallyl quaternary ammonium salt / acrylamide copolymer (e.g., Merquat Plus 3331 (Nalco)), etc.).

[0086] 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.

[0087] Other examples of the polymer compound include anionic polymers such as carboxyvinyl polymers, water-soluble polymers, etc. Specific examples of the water-soluble polymer 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.

[0088] (Peptides, Amino Acids) Peptides and amino acids are organic compounds having 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 blended alone or in combination of two or more.

[0089] (Chelating Agent) A chelating agent has a ligand and binds to a metal ion. Specific examples of the chelating agent 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.

[0090] (pH Adjusting Agent) The pH adjusting agent is used to adjust the pH of the composition, and comprises 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.

[0091] 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 alkali components such as morpholine, alkanolamines such as monoethanolamine, amino alcohols such as 2-amino-2-methyl-1-propanol, and basic amino acids such as L-arginine, L-lysine, and L-histidine.

[0092] (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 produce various colors when combined with dye intermediates. Dye intermediates are dye precursors, primarily o- or p-phenylenediamines or aminophenols, and are usually colorless or weakly colored compounds themselves. 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, and 2,2'-[(4-aminophenyl)imino]bisethanol. One or more dye intermediates can be selected and used depending on the desired hair color tone. Examples of couplers include salts of m-diamines, aminophenols, and 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, resorcinol, catechol, pyrogallol, phloroglucinol, gallic acid, hydroquinone, α-naphthol, phenylmethylpyrazolone, 3,3′-iminodiphenyl, 1,5-dihydroxynaphthalene, tannic acid, 5,6-dihydroxyindoline, 5,6-dihydroxyindole, etc. One or more couplers can be selected and used depending on the desired hair color tone.

[0093] (Direct dye) The direct dye is a colored compound, and is not particularly limited as long as it adheres to or penetrates into hair to dye it. Examples include acid dyes, basic dyes, natural dyes, nitro dyes, HC dyes, disperse dyes, etc. Furthermore, these direct dyes may be blended alone or in combination of two or more types depending on the desired hair color tone.

[0094] (Others) The low-density composition and the 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).

[0095] EXAMPLES The present invention will be explained in more detail below by showing examples of the aerosol product of the present invention, but the present invention is not limited to these examples in any way.

[0096] Example 1 In Example 1, examples of component formulations (low-density composition (first agent), high-density composition (second agent), and mixtures thereof) for an aerosol product focusing on simultaneous penetration of the two agents (foam and cream), adhesion to hair, and uniform application, which are properties related to the feel during and after application to hair, are shown, along with the evaluation results. A first agent (foam) comprising the low-density composition of the present invention and a second agent (cream) comprising the high-density composition for each Example (Examples 1-1-1 to 1-1-13 relating to the first agent and Examples 1-2-1 to 1-2-13 relating to the second agent) were prepared in the amounts shown in Tables 1 and 2 by a conventional method. Furthermore, the first agent and the second agent were mixed in the usual manner to prepare mixtures (hereinafter also referred to as "oxidative hair dyes") in the amounts shown in Tables 1 and 2. The LPG in the tables was filled at 0.4 mPa. These were evaluated for simultaneous penetration of the two agents, adhesion to hair, and uniform application according to the following evaluation criteria. The evaluation results are also shown in Tables 1 and 2.

[0097] <Method for Evaluating Simultaneous Penetration> A low-density composition serving as a foam agent was colored in advance by blending an appropriate amount of Yellow No. 203. The colored first agent (foam agent) and the uncolored second agent (cream agent) were used to evaluate the simultaneous penetration of the two agents. Simultaneous penetration was evaluated by simultaneously discharging 5 g of the colored first agent and 4 g of the uncolored second agent onto a wig from a two-layer aerosol product with a first agent as the lower layer and a second agent as the upper layer. Ten expert panelists visually observed the timing at which both agents simultaneously penetrated the wig's hair, and evaluated the results according to the following criteria. The application was performed using gloved hands, pressing the dispensed agent against the hair. 4: The timing at which the first and second agents penetrated was completely indistinguishable. 3: The timing at which the first and second agents penetrated was barely distinguishable. 2: The timing at which the first and second agents penetrated was somewhat clearly distinguishable. 1: The timing of penetration of the first and second agents can be clearly distinguished. The average scores of each expert panelist were calculated, and an average score of 3.4 points or more was rated as "excellent: ◎", an average score of 2.8 points or more but less than 3.4 points was rated as "fair to good: ◯", and an average score of less than 2.8 points was rated as "slightly poor to poor: △". The evaluation results are shown in the "Simultaneous Penetration" column of Tables 1 and 2.

[0098] <Method for Evaluating Adhesion> Both the first and second agents were dispensed onto the palm of the hand and applied by hand to a black wig (Queen Cut No. 775S, manufactured by Beaulux). Ten expert panelists observed the state of the mixture at the roots of the hair immediately after application and 5 minutes later, and evaluated it according to the following criteria. The condition was rated on a 5-point scale: excellent (5 points) when the same amount of mixture remained at the roots as immediately after application; good (4 points) when the mixture flowed slightly more than immediately after application but remained at the roots; fair (3 points) when the mixture flowed more than immediately after application but remained at the roots; slightly poor (2 points) when the mixture flowed more than immediately after application and barely remained at the roots; and poor (1 point) when the mixture did not remain at the roots and dripped off the hair. The average score of each panelist was calculated, and the evaluation results were determined as follows: an average score of 4.6 or more was "excellent: 5", an average score of 3.6 or more but less than 4.6 was "good: 4", an average score of 2.6 or more but less than 3.6 was "fair: 3", an average score of 1.6 or more but less than 2.6 was "slightly poor: 2", and an average score of less than 1.6 was "poor: 1". The evaluation results are shown in the "Adhesion" column of Tables 1 and 2.

[0099] <Method for evaluating uniform application> 5 g of the first agent (foam agent) and 4 g of the second agent (cream agent) were dispensed, and the mixture (oxidative hair dye) was applied to a black wig (Bealux Co., Ltd. Queen Cut No. 775S) using a brush in an amount three times the weight of the black wig (bath ratio 1:3), and left to stand at 30°C for 30 minutes. After standing, 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. Ten panelists visually observed the degree of color unevenness of the dyed black wig and evaluated (sensory evaluation) whether or not there was color unevenness. Specifically, "evenly dyed" was rated as "5", "almost evenly dyed" as "4", "some unevenness but within an acceptable range" as "3", "much unevenness" as "2", and "very much unevenness" as "1". The average of the scoring results of each panelist was calculated, and an average of 4.6 points or more was rated as "excellent: 5", 3.6 points or more but less than 4.6 points as "good: 4", 2.6 points or more but less than 3.6 points as "fair: 3", 1.6 points or more but less than 2.6 points as "slightly poor: 2", and less than 1.6 points as "poor: 1", and these were used as evaluation results. The evaluation results are shown in the "Uniformity of Application" column of Tables 1 and 2.

[0100]

[0101] As shown in Table 1, the aerosol products of the present invention in this example were evaluated as excellent in terms of uniform application by containing component (A) and component (B) in the first or second agent. In particular, as shown in the evaluation results for the oxidation hair dyes of Examples 1-1-1 to 1-1-5 and 1-2-1 to 1-2-5, by containing the cationic surfactant (B1) as component (B) in the first or second agent, the simultaneous penetration of the two agents (foam and cream) and the adhesion of the oxidation hair dye, which is a mixture of foam and cream, to hair were evaluated as excellent. Furthermore, when comparing the oxidative hair dyes of Examples 1-1-1 and 1-2-1 with the oxidative hair dyes of Examples 1-1-2 to 1-1-5 and 1-2-2 to 1-2-5, the inclusion of component (A) and component (B1) in both the first and second agents resulted in extremely excellent evaluations of the simultaneous penetration of the two agents (foam and cream) and the adhesion to hair of the oxidative hair dye, which is a mixture of foam and cream.

[0102]

[0103] Furthermore, as shown in Table 2, the oxidative hair dyes of Examples 1-1-8 to 1-1-10 and 1-2-8 to 1-2-10, which are examples in which the type of component (A) or (B1) shown in Example 1-1-1 and Example 1-2-1 was changed, were similarly evaluated as being excellent in terms of simultaneous penetration of the two agents (foam and cream) and adhesion to hair of the oxidative hair dye, which is a mixture of foam and cream. That is, the aerosol product of the present invention exhibits excellent uniform application to hair by containing component (A) and component (B) in the first or second agent. In addition, by using the cationic surfactant component (B1) as component (B), the product exhibits excellent effects in terms of simultaneous penetration of the two agents and adhesion to hair, among the feel during and after application to hair. In particular, by containing component (A) and component (B1) in both the first and second agents, the product exhibits extremely excellent effects in terms of simultaneous penetration of the two agents, adhesion to hair, and uniform application.

[0104] As shown in Table 2, when the oxidative hair dyes of Examples 1-1-1 and 1-2-1 are compared with those of Examples 1-1-11 and 1-2-11, it is clear that the inclusion of component (C) improves simultaneous penetration and also improves adhesion to hair and uniform application of the oxidative hair dye, which is a mixture of foam and cream. Furthermore, when the oxidative hair dyes of Examples 1-1-1 and 1-2-1 are compared with those of Examples 1-1-12 to 1-1-13 and 1-2-12 to 1-2-13, it is clear that increasing the content of component (D) improves the uniform application of the oxidative hair dye, which is a mixture of foam and cream. This indicates that the inclusion of component (D) improves uniform application.

[0105] Example 2 In Example 2, examples of the formulation of each component (low-density composition (first agent), high-density composition (second agent), and their mixture) for an aerosol product focusing on the mixability of the two agents, the spreadability of the mixture, and the uniform application, which are properties related to the feel during and after application to hair, are shown, along with the evaluation results. A first agent (foam) comprising the low-density composition of the present invention and a second agent (cream) comprising the high-density composition for each Example (Examples 2-1-1 to 2-1-13 relating to the first agent and Examples 2-2-1 to 2-2-13 relating to the second agent) were prepared by a conventional method using the blending amounts shown in Tables 3 and 4. Furthermore, the first agent and the second agent were mixed by a conventional method to prepare mixtures (oxidation hair dyes) with the blending amounts shown in Tables 3 and 4. The LPG in the tables was filled at 0.4 mPa. The mixability of the two agents, the spreadability of the mixture, and the uniform application were evaluated according to the following evaluation criteria. The evaluation results are also shown in Tables 3 and 4.

[0106] <Method for Evaluating Mixability> A low-density composition serving as a foaming agent was colored in advance by blending an appropriate amount of Yellow No. 203. The colored first agent (foaming agent) and the uncolored second agent (cream agent) were used to evaluate the mixability of the two agents. To evaluate mixability, 5 g of the colored first agent and 4 g of the uncolored second agent were mixed together, and visually observed to determine whether they were indistinguishably uniformly mixed. The mixture was ranked according to the following evaluation criteria, ranging from ◎ to ×. The mixing operation was performed using a brush attached to a product called Bigen Cream Tone (manufactured by Hoyu Co., Ltd.) and by hand, drawing a circle approximately 5 cm in diameter at the same speed 15 times. The evaluation results are shown in the "Mixability" column of Tables 3 and 4. ◎: Completely indistinguishable. ○: Almost indistinguishable. △: Somewhat clearly distinguishable. ×: Clearly distinguishable.

[0107] <Method for Evaluating Spreadability> 5 g of the first agent (foam) and 4 g of the second agent (cream) were dispensed, and the foam and cream were mixed to prepare a mixture (oxidation hair dye). The oxidation hair dye was applied to a wig from the roots to the ends multiple times, and the spread (spreadability) of the mixture was evaluated according to the following criteria. Ten panelists judged the spread of the mixture according to the following criteria. The spread of the mixture was scored on a five-point scale: excellent (5 points), good (4 points), fair (3 points), somewhat poor (2 points), and poor (1 point). The average score of each panelist was calculated, and the evaluation results were determined as follows: an average score of 4.6 or more was "excellent: 5", an average score of 3.6 or more but less than 4.6 was "good: 4", an average score of 2.6 or more but less than 3.6 was "fair: 3", an average score of 1.6 or more but less than 2.6 was "slightly poor: 2", and an average score of less than 1.6 was "poor: 1". The evaluation results are shown in the "Extensibility" column of Tables 3 and 4.

[0108] <Method for Evaluating Uniform Coating Property> The presence or absence of color unevenness was evaluated (sensory evaluation) for Example 2 in accordance with the method for evaluating uniform coating property shown in Example 1. The evaluation results are shown in the "Uniform Coating Property" column of Tables 3 and 4.

[0109]

[0110] As shown in Table 3, the aerosol products of the present invention in this example were evaluated as excellent in terms of uniform application by containing the components (A) and (B) in the first or second agent, similarly to the above-mentioned Example 1. In particular, as shown in the evaluation results for the oxidation hair dyes of Examples 2-1-1 to 2-1-5 and Examples 2-2-1 to 2-2-5, by containing the anionic surfactant (B2) as the component (B) in the first or second agent, the mixability of the two agents (foam and cream) and the spreadability of the oxidation hair dye mixture were evaluated as excellent. Furthermore, when comparing the oxidative hair dyes of Examples 2-1-1 and 2-2-1 with the oxidative hair dyes of Examples 2-1-2 to 2-1-5 and Examples 2-2-2 to 2-2-5, the oxidative hair dyes, which are a mixture of two agents (foam and cream), were evaluated as having excellent spreadability on hair due to the inclusion of component (A) and component (B2) in both the first and second agents.

[0111]

[0112] Furthermore, as shown in Table 4, the oxidative hair dyes of Examples 2-1-8 to 2-1-10 and Examples 2-2-8 to 2-2-10, which are examples in which the type of component (A) or (B2) shown in Example 2-1-1 and Example 2-2-1 was changed, were also evaluated as being excellent in terms of the mixability of the two components (foam and cream) and the spreadability of the oxidative hair dye mixture. In other words, by using the anionic surfactant (B2) as the component (B), the aerosol product of the present invention exhibits excellent effects in terms of the mixability of the two components (foam and cream) and the spreadability of the oxidative hair dye mixture, among other things, in terms of the feel during and after application to hair. In particular, by including the components (A) and (B2) in both the first and second agents, extremely excellent effects are exhibited in terms of the mixability of the two agents, the spreadability of the mixture, and the uniform application ability.

[0113] As shown in Table 4, when comparing the oxidative hair dyes of Examples 2-1-1 and 2-2-1 with the oxidative hair dyes of Examples 2-1-11 and 2-2-11, it can be seen that the inclusion of component (C) improves the spreadability and uniform application of the oxidative hair dye, which is a mixture of foam and cream, to hair. Furthermore, when comparing the oxidative hair dyes of Examples 2-1-1 and 2-2-1 with the oxidative hair dyes of Examples 2-1-12 to 2-1-13 and 2-2-12 to 2-2-13, it can be seen that increasing the content of component (D) improves the uniform application of the oxidative hair dye, which is a mixture of foam and cream, and therefore it can be seen that the inclusion of component (D) improves the uniform application.

[0114] Example 3 In Example 3, examples of component formulations (low-density composition (first agent), high-density composition (second agent), and mixtures thereof) for aerosol products focusing on defoaming properties, compatibility with hair, and uniform application when the two agents are mixed are shown, along with the evaluation results. A first agent (foaming agent) comprising the low-density composition of the present invention and a second agent (cream) comprising the high-density composition of the present invention for each Example (Examples 3-1-1 to 3-1-13 relating to the first agent and Examples 3-2-1 to 3-2-13 relating to the second agent) were prepared in the usual manner using the blending amounts shown in Tables 5 and 6. Furthermore, the first and second agents were mixed in the usual manner to prepare mixtures (oxidative hair dyes) with the blending amounts shown in Tables 5 and 6. The LPG in the tables was filled at 0.4 mPa. These were evaluated for defoaming properties, compatibility with hair, and uniform application when the two agents were mixed, according to the following evaluation criteria. The evaluation results are also shown in Tables 5 and 6.

[0115] <Method for evaluating defoaming properties during mixing> The foam state (defoaming properties during mixing) when the first agent (foam agent) and the second agent (cream agent) were mixed was evaluated. The defoaming properties during mixing were evaluated by mixing 5 g of the first agent and 4 g of the second agent, visually inspected by 10 expert panelists, and evaluated according to the following evaluation criteria. The mixing was performed using a brush attached to a Bigen Cream Tone product (trade name) manufactured by Hoyu Corporation, and by hand, stirring 15 times at the same speed in a circular motion of approximately 5 cm in diameter. 3: The foam was moderately reduced during mixing, making it very easy to mix with the cream agent. 2: The foam was reduced during mixing, making it easy to mix with the cream agent. 1: The foam was barely reduced or almost completely disappeared during mixing, making it difficult to mix with the cream agent. The average score of each panelist was calculated, and an average score of 2.6 points or more was evaluated as "excellent: 5", 2.2 points or more but less than 2.6 points as "good: 4", 1.8 points or more but less than 2.2 points as "fair: 3", 1.4 points or more but less than 1.8 points as "slightly poor: 2", and less than 1.4 points as "poor: 1". The evaluation results are shown in the "Defoaming property when mixed" column of Tables 5 and 6.

[0116] <Method for evaluating compatibility with hair> The first agent (foam) and the second agent (cream) were dispensed at a ratio of 1:0.8 and mixed to prepare an oxidation hair dye. The oxidation hair dye was applied to a black wig (Bealux Co., Ltd., Queen Cut No. 775S) using gloved hands (bath ratio 1:1.5), and 10 expert panelists evaluated compatibility with hair according to the following criteria. Compatibility with hair was scored on a 5-point scale: excellent (5 points), good (4 points), fair (3 points), somewhat poor (2 points), and poor (1 point). The average score of each panelist was calculated, and an average score of 4.6 points or more was evaluated as "excellent: 5", 3.6 points or more but less than 4.6 points was evaluated as "good: 4", 2.6 points or more but less than 3.6 points was evaluated as "fair: 3", 1.6 points or more but less than 2.6 points was evaluated as "slightly poor: 2", and less than 1.6 points was evaluated as "poor: 1". The evaluation results are shown in the "Fitment" column of Tables 5 and 6.

[0117] <Method for Evaluating Uniform Coating Property> The presence or absence of color unevenness was evaluated (sensory evaluation) for Example 3 in accordance with the method for evaluating uniform coating property shown in Example 1. The evaluation results are shown in the "Uniform Coating Property" column of Tables 5 and 6.

[0118]

[0119] As shown in Table 5, the aerosol products of the present invention in this example were evaluated as excellent in terms of uniform application by containing the components (A) and (B) in the first or second agent, similarly to the above-mentioned Examples 1 and 2. In particular, as shown in the evaluation results for the oxidation hair dyes of Examples 3-1-1 to 3-1-5 and Examples 3-2-1 to 3-2-5, by containing the amphoteric surfactant (B3) as the component (B) in the first or second agent, the defoaming properties when the two agents (foam and cream) are mixed and the affinity of the oxidation hair dye mixture to the hair were evaluated as excellent. Furthermore, when comparing the oxidative hair dyes of Examples 3-1-1 and 3-2-1 with the oxidative hair dyes of Examples 3-1-2 to 3-1-5 and Examples 3-2-2 to 3-2-5, the oxidative hair dyes, which are a mixture of two agents (foam and cream), were evaluated as being extremely excellent in terms of compatibility with hair due to the inclusion of component (A) and component (B3) in both the first and second agents.

[0120]

[0121] Furthermore, as shown in Table 6, the oxidative hair dyes of Examples 3-1-8 to 3-1-10 and Examples 3-2-8 to 3-2-10, which are examples in which the type of component (A) or component (B3) shown in Example 3-1-1 and Example 3-2-1 was changed, were also evaluated as being extremely excellent in terms of defoaming properties and compatibility with hair when the two components were mixed. That is, by using the amphoteric surfactant component (B3) as the component (B), the aerosol product of the present invention exhibits excellent effects in terms of defoaming properties and compatibility with hair when the two components are mixed. In particular, by containing component (A) and component (B3) in both the first and second agents, extremely excellent effects are exhibited in terms of defoaming properties, compatibility with hair, and uniform application when the two components are mixed.

[0122] As shown in Table 6, when comparing the oxidative hair dyes of Examples 3-1-1 and 3-2-1 with the oxidative hair dyes of Examples 3-1-11 and 3-2-11, it can be seen that the inclusion of component (C) improves the affinity to hair and the uniform application of the oxidative hair dye, which is a mixture of foam and cream. Furthermore, when comparing the oxidative hair dyes of Examples 3-1-1 and 3-2-1 with the oxidative hair dyes of Examples 3-1-12 to 3-1-13 and 3-2-12 to 3-2-13, it can be seen that increasing the content of component (D) improves the uniform application of the oxidative hair dye, which is a mixture of foam and cream. This indicates that the inclusion of component (D) improves the uniform application of the oxidative hair dye.

[0123] 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 in external cosmetics such as hair removal creams and shaving gels. More preferably, it can be used, for example, in oxidative hair dyes comprising a first agent containing an alkaline agent and a second agent containing an oxidizing agent.

Claims

1. An aerosol product that uses a mixture of a low-density composition and a high-density composition, wherein the low-density composition and / or the high-density composition contain (A) a nonionic surfactant and (B) an ionic surfactant, the low-density composition has a density of 0.01 g / mL or more and 0.30 g / mL or less at 25°C, and the high-density composition has a density of more than 0.30 g / mL and 1.5 g / mL or less at 25°C.

2. The aerosol product according to claim 1, characterized in that the low density composition is a foam and the high density composition is a cream.

3. The aerosol product according to claim 1 or 2, characterized in that the low-density composition and / or the high-density composition contains (C) a higher alcohol.

4. The aerosol product according to claim 1 or 2, characterized in that the low-density composition and / or the high-density composition contains an oil component (D), and the content of the oil component (D) (excluding the component (C)) is 2.5 mass% or more.

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