JP7257154B2 - Foaming aerosol product and hair washing method - Google Patents

Description

The present invention relates to foaming aerosol products and hair washing methods.

In recent years, foaming aerosol products, which are used by filling a container with an undiluted solution together with a propellant and applying the formed foam to the hair after spraying from the container, have become popular because of their ease of use.
Among them, carbon dioxide (carbon dioxide gas) is attracting attention for its effect of promoting blood circulation in the skin. A technique for performing hair treatment using foamed foam has been proposed (see Japanese Patent Application Laid-Open No. 2014-111560).

JP 2014-111560 A

By the way, in a foaming aerosol product containing carbon dioxide as a propellant, foam formed by jetting from a container tends to defoam on the hair, and there is room for improvement in suppressing defoaming.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a foaming aerosol product and a hair washing method capable of suppressing defoaming of foams formed by a propellant containing carbon dioxide.

The inventor of the present invention conducted intensive studies to suppress defoaming during hair washing using foams formed by a propellant containing carbon dioxide, and found that N-acyl glutamates and α-olefin sulfonates , and betaine alkyldimethylaminoacetate are found to be significant in the undiluted solution, leading to the completion of the present invention.

That is, the foaming aerosol product according to the present invention is a foaming aerosol product used for hair washing,
[A] A stock solution containing N-acyl glutamate, α-olefin sulfonate, and betaine alkyldimethylaminoacetate, and [B] a propellant containing carbon dioxide are filled in a container.

The stock solution [A] is preferably mixed with charcoal. As a result, it is excellent in cleansing the scalp (removing oil) while suppressing defoaming.

The total amount of the anionic surfactant and the amphoteric surfactant in the stock solution [A] is preferably 15% by mass or less. Here, the undiluted solution does not contain any anionic surfactant or amphoteric surfactant other than the three components of N-acylglutamate, α-olefin sulfonate, and betaine alkyldimethylaminoacetate. may be used, or only one of them may be blended. Thus, the total amount of anionic surfactants (including N-acylglutamates and α-olefin sulfonates) and amphoteric surfactants (including betaine alkyldimethylaminoacetates) in the undiluted solution is 15% by mass or less. By doing so, it is possible to reduce the irritation given to the scalp during hair washing.

The hair washing method according to the present invention uses the foaming aerosol product described above to wash the hair.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress defoaming in the case of washing hair using a foam formed by a propellant containing carbon dioxide.

Hereinafter, the present invention will be described by taking the foaming aerosol product and the hair washing method of the present embodiment as examples.
The foaming aerosol product of the present embodiment is a foaming aerosol product used for hair washing,
[A] A stock solution containing N-acyl glutamate, α-olefin sulfonate, and betaine alkyldimethylaminoacetate, and [B] a propellant containing carbon dioxide are filled in a container.

([A] undiluted solution)
The stock solution [A] contains N-acylglutamate, α-olefin sulfonate, and betaine alkyldimethylaminoacetate (the content of water in the stock solution [A] is, for example, 70% by mass or more. be.).
By blending the above three components in the stock solution, defoaming is suppressed in lathering when hair is washed with foam formed by a propellant containing carbon dioxide. As a result, the hairs are prevented from being caught by each other during hair washing, and the operability of hair washing is improved. In addition, when scalp massage is performed during hair washing, operability is improved by preventing the hairs from catching on each other during the massage.
In addition, by blending the above three components in the stock solution, not only can the foam quality be improved even after the hair is washed with the foam formed by the propellant containing carbon dioxide, but also the foam can be improved. Sufficient quantity can be secured.
In addition, in the stock solution [A], any ingredients known as raw materials for hair cleansing agents such as shampoos may be blended as long as they do not impair the effects of the present invention.

［上記一般式（１）において、Ｒ^１は、直鎖の飽和又は不飽和の炭素数８以上２２以下の炭化水素基を表す。また、Ｘ及びＹは、水素、ナトリウム、カリウム、トリエタノールアミンを表す。なお、Ｘ及びＹが両方とも水素となることはない。］ (N-acyl glutamate)
N-acylglutamate is represented by the following general formula (1).

[In the above general formula (1), R ¹ represents a linear saturated or unsaturated hydrocarbon group having 8 or more and 22 or less carbon atoms. Moreover, X and Y represent hydrogen, sodium, potassium, and triethanolamine. Note that both X and Y are not hydrogen. ]

Examples of N-acyl glutamates include capryloyl glutamate (e.g., disodium capryloyl glutamate), N-cocoyl glutamate (e.g., disodium cocoyl glutamate, sodium cocoyl glutamate, potassium cocoyl glutamate, TEA cocoyl glutamate, etc.), N-lauroyl glutamate (e.g., sodium lauroyl glutamate, disodium lauroyl glutamate, potassium lauroyl glutamate, TEA lauroyl glutamate, etc.), N-myristoyl glutamate (e.g., sodium myristoyl glutamate, potassium myristoyl glutamate, etc.), N-palmitoyl glutamate, N-stearoyl glutamate (e.g. stearoyl glutamate 2Na, stearoyl glutamate Na, stearoyl glutamate K etc.), N-oleoyl glutamate, N-palm fatty acid glutamate (e.g. palm fatty acid Na glutamate etc.), N-olive fatty acid glutamic acid Salts (for example, sodium glutamate of olive oil fatty acid, etc.) and the like are included.

By blending the N-acyl glutamate with the [A] stock solution of the foaming aerosol product of the present embodiment, the foam foamed from the foaming aerosol product has a creamy (many fine bubbles) foam quality. realizable.

[A] The stock solution contains one or more of the above N-acylglutamic acid salts.
[A] The lower limit of the amount of the N-acylglutamic acid salt compounded in the stock solution is preferably 0.5% by mass or more, more preferably 1% by mass or more, from the viewpoint of achieving a creamier (many fine bubbles) foam quality. In addition, the upper limit of the amount of N-acylglutamate in the stock solution [A] is preferably 10% by mass or less, and more preferably 5% by mass or less, from the viewpoint of better foam retention.

(α-olefin sulfonate)
The α-olefin sulfonate is a salt adduct of alkylsulfonic acid in which α-olefin having 10 to 20 carbon atoms is sulfonated.
Examples of the α-olefin sulfonate include sodium olefin (C12-14) sulfonate, sodium olefin (C14-16) sulfonate, sodium olefin (C14-18) sulfonate, and sodium tetradecene sulfonate. .

By blending the α-olefin sulfonate into the [A] stock solution of the foaming aerosol product of the present embodiment, the foaming aerosol product has excellent fast foaming properties.

[A] The stock solution contains one or more of the α-olefin sulfonates.
[A] The lower limit of the amount of the α-olefin sulfonate compounded in the stock solution is preferably 0.5% by mass or more from the viewpoint of improving the rapid foaming property when the foaming aerosol product is foamed. , more preferably 1% by mass or more. In addition, the upper limit of the amount of the α-olefin sulfonate in the stock solution [A] is preferably 10% by mass or less, more preferably 6% by mass or less, from the viewpoint of making the hair softer to the touch during hair washing. .

［上記一般式（２）において、Ｒ^２は、アルキル基を表し、例えば、炭素数１０以上１８以下の直鎖状アルキル基である。］ (betaine alkyldimethylaminoacetate)
Alkyldimethylamino acetic acid betaine is represented by the following general formula (2).

[In the general formula (2), R ² represents an alkyl group, for example, a linear alkyl group having 10 or more and 18 or less carbon atoms. ]

Specific examples of the betaine alkyldimethylaminoacetate include betaine lauryldimethylaminoacetate, betaine stearyldimethylaminoacetate, betaine cetyldimethylaminoacetate, and betaine myristyldimethylaminoacetate.

By blending betaine alkyldimethylaminoacetate with [A] stock solution of the foaming aerosol product of the present embodiment, excellent foam retention during hair washing can be obtained.

[A] The undiluted solution contains one or more of the alkyldimethylamino acetic acid betaines.
[A] The lower limit of the content of betaine alkyldimethylaminoacetate in the stock solution is preferably 0.5% by mass or more, more preferably 2% by mass or more, from the viewpoint of improving foam retention in hair washing. The upper limit of the amount of betaine alkyldimethylaminoacetate in the stock solution [A] is preferably 10% by mass or less, more preferably 8% by mass or less, from the viewpoint of making the hair softer to the touch during hair washing.
The amount of betaine alkyldimethylaminoacetate blended in the stock solution [A] may be greater than the blended amount of N-acylglutamate and greater than the blended amount of α-olefin sulfonate.

(Optional raw materials in stock solution)
[A] As described above, raw materials used in known hair cleansing agents such as shampoos are arbitrarily blended into the stock solution [A]. This optional raw material is a component other than the above three components, for example, charcoal, amphoteric surfactant, anionic surfactant, nonionic surfactant, cationic polymer, polyhydric alcohol, cooling agent, acid, lower alcohol, Components such as saccharides, polymer compounds, amino acids, plant and animal extracts, inorganic compounds, fragrances, and preservatives may be included. In addition, you may use each arbitrary component individually or in combination of 2 or more types, respectively.

Charcoal is a dry charcoal obtained by heating or the like from wood or bamboo. If charcoal is blended, sebum stains on the scalp and pores can be adsorbed, and a scalp cleansing effect can be obtained.
The charcoal is not particularly limited as long as it can be blended into foaming aerosol products, but examples include activated charcoal, medicinal charcoal, paulownia charcoal, cedar charcoal, bamboo charcoal, binchotan charcoal, and cypress charcoal. From the viewpoint of improving cleansing of the scalp, it is preferable to use a powdery one. Although the upper limit of the volume average particle size of charcoal is not particularly limited, it is, for example, 50 μm. The value of the volume average particle size of the charcoal can be measured by a laser diffraction/scattering method (as a measuring device, for example, "Microtrac MT3000" manufactured by Nikkiso Co., Ltd. can be used). By setting the upper limit of the volume-average particle size of charcoal to 50 μm, it is possible to improve operability during hair washing and to suppress clogging of the injection port of foaming aerosol products. In addition, the lower limit of the volume average particle size of charcoal is, for example, 0.5 μm.
The lower limit of the content of charcoal in the [A] stock solution is not particularly limited, but can be, for example, 0.010% by mass or more. Here, from the viewpoint of sufficiently suppressing the decrease in the amount of foam after foaming during hair washing and improving the foam retention, it is preferable that the content of charcoal in the [A] stock solution is 0.4% by mass or less. preferable. From the viewpoint of improving foam quality after foaming during hair washing, the content of charcoal in the [A] stock solution is preferably 0.025% by mass or more.

Examples of amphoteric surfactants other than betaine alkyldimethylaminoacetate include amidopropyl betaine such as coconut oil fatty acid amidopropyl betaine, lauramidopropyl betaine, isostearamide propyl betaine, linoleic acid amidopropyl betaine, and palm kernel fatty acid amidopropyl betaine. Amidoalkyl betaine type amphoteric surfactants including betaine type amphoteric surfactants; imidazoline-type amphoteric surfactants such as ethylimidazolinium betaine, undecyl-N-hydroxyethyl-N-carboxymethylimidazolinium betaine; N-alkyl-N,N-dimethylammonium-N-propylsulfonate sodium, N- Sulfobetaine types such as sodium alkyl-N,N-dimethylammonium-N-(2-hydroxypropyl)sulfonate and sodium N-fatty acid amidopropyl-N,N-dimethylammonium-N-(2-hydroxypropyl)sulfonate amphoteric surfactants; amidoamine oxide type amphoteric surfactants such as lauramidopropyl dimethylamine oxide; and the like.

Examples of anionic surfactants other than the N-acylglutamate and α-olefin sulfonate include acyl amino acids other than N-acylglutamate or salts thereof (e.g., acyl aspartic acid or salts thereof, acyl alanine or salt, acylmethylalanine or its salt, acylglycine or its salt, etc.); coconut oil fatty acid or its salt (sodium salt, potassium salt, etc.), cocoylisethioic acid or its salt (sodium salt, potassium salt, etc.); Ethylene lauryl ether sulfuric acid or its salts (sodium salt, potassium salt, etc.); Polyoxyethylene lauryl ether acetic acid or its salts (sodium salt, potassium salt, etc.); salt, potassium salt, etc.); lauroyl hydrolyzed silk sodium; isostearic acid hydrolyzed silk AMP (2-amino-2-methyl-1-propanol salt of the condensation product of isostearic acid and hydrolyzed silk); cocoyl hydrolyzed soy protein potassium; salts of cocoyl hydrolyzed collagen (sodium salt, potassium salt, etc.); polyoxyethylene lauryl ether phosphate or salts thereof (sodium salt, potassium salt, etc.);

The total amount of anionic surfactant (including N-acylglutamate and α-olefin sulfonate) and amphoteric surfactant (including betaine alkyldimethylaminoacetate) in the [A] stock solution is 15 mass. % or less. As a result, it is possible to reduce the stimulation given to the scalp during hair washing. In addition, even if the total amount of the compounded amount is suppressed to 15% by mass or less to suppress irritation to the scalp, N-acylglutamate, α-olefin sulfonate, and alkyldimethylamino in the [A] stock solution Defoaming during hair washing can be suppressed by containing betaine acetate.
In addition, from the viewpoint of minimizing irritation to the scalp, [A] anionic surfactant (including N-acylglutamate and α-olefin sulfonate) and amphoteric surfactant (alkyldimethylaminoacetic acid betaine) in the undiluted solution ) and the nonionic surfactant is more preferably 15% by mass or less.

Examples of nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol tetra fatty acid esters, glycerin fatty acid esters, poly Oxyethylene glycerin fatty acid ester, alkyl glucoside, sorbitan fatty acid ester, polyglycerin fatty acid ester, sucrose fatty acid ester and the like. [A] The stock solution may be blended with one or more nonionic surfactants, and the amount of the nonionic surfactant in the [A] stock solution is, for example, 0.1% by mass or more and 5% by mass or less. be.

Examples of cationic polymers include cationized cellulose, cationized guar gum, vinylpyrrolidone/N,N-dimethylaminoethyl methacrylic acid copolymer diethyl sulfate, acrylamide/acrylic acid/dimethyldiallylammonium chloride copolymer, N , N-dimethylaminoethyl methacrylate diethyl sulfate/N,N-dimethylacrylamide/polyethylene glycol dimethacrylate copolymer. [A] By blending a cationic polymer in the stock solution, it is possible to improve finger combability when rinsing the foam formed from the foaming aerosol product from the hair. [A] The stock solution may contain one or more cationic polymers, and the amount of the cationic polymer in the [A] stock solution is, for example, 0.1% by mass or more and 1% by mass or less. .

Examples of polyhydric alcohols include ethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-butylene glycol, glycerin, polyglycerin and the like. One or two or more polyhydric alcohols may be blended in the [A] stock solution, and the blending amount of the polyhydric alcohol in the [A] stock solution is, for example, 0.01% by mass or more and 5% by mass or less.

Cooling agents include, for example, menthol. One or two or more cooling agents may be added to the [A] stock solution, and the content of the cooling agent in the [A] stock solution is, for example, 0.05% by mass or more and 1% by mass or less.

Examples of acids include organic acids such as malic acid, lactic acid, tartaric acid, citric acid, succinic acid and glycolic acid; inorganic acids such as phosphoric acid, sulfuric acid and hydrochloric acid; and the like. One or two or more acids may be blended in the [A] stock solution, and the blending amount of the acid in the [A] stock solution is, for example, 0.1% by mass or more and 1.5% by mass or less.

(dosage form)
[A] The stock solution is preferably liquid. When the viscosity of the liquid [A] stock solution is measured using a Brookfield viscometer (temperature: 25 ° C., rotor: set appropriately according to viscosity, rotor rotation speed: 60 rpm), 60 seconds from the start of viscosity measurement The value after passage is preferably 10 mPa·s or more and 20,000 mPa·s or less, more preferably 20 mPa·s or more and 15,000 mPa·s or less, and even more preferably 30 mPa·s or more and 12,000 mPa·s or less.

(pH)
[A] The pH of the undiluted solution is preferably weakly acidic. By keeping the pH at a weak acidity, it is possible to suppress the conversion of carbon dioxide into carbonate and enhance the effect of promoting blood circulation. can be suppressed. [A] The pH of the undiluted solution is preferably 4.0 or more and 6.8 or less, more preferably 4.5 or more and 6.5 or less.

(chloride ion concentration)
[A] The chloride ion concentration of the undiluted solution is preferably 500 ppm by mass or less from the viewpoint of suppressing corrosion of the container, which will be described later.
The chloride ion concentration refers to the analytical value by ion chromatography (for example, by using Dionex's "ICS-2000" equipped with Dionex's anion exchange column "IonPacAS18", chloride ion concentration Analytical value is obtained.).

([B] propellant)
The container in the foaming aerosol product of the present embodiment is filled with [B] propellant. The [B] propellant foams the [A] undiluted solution ejected from the container.

[B] The propellant contains carbon dioxide. As a result, carbon dioxide can be contained in the foamed foam, so that blood circulation in the scalp can be promoted, and the scalp can be cleansed (removed oil).
In the foaming aerosol product of the present embodiment, the concentration of carbon dioxide filled in the container is 0.8% by mass or more, preferably 1.0% by mass or more, and preferably 1.1% by mass or more. Also, the concentration of carbon dioxide filled in the container can be, for example, 3.0% by mass or less. Here, the concentration of carbon dioxide filled in the container is calculated by "(carbon dioxide)/([A] undiluted solution and [B] propellant filled in container)×100".

[B] The propellant may further contain one or more components other than carbon dioxide. Such components include, for example, liquefied petroleum gas (LPG), isopentane, dimethyl ether, nitrogen and mixtures thereof.
The liquefied petroleum gas is not particularly limited, but may be, for example, propane and n-butane (normal butane), propane and i-butane (isobutane), or propane, n-butane and i-butane. It is speculated that liquefied petroleum gas contributes to initial foaming due to its high volatility.
Isopentane is speculated to contribute to foam persistence when removed from the container. Moreover, when filling isopentane together with liquefied gas, it is preferable that the amount of liquefied gas is larger than that of isopentane in order to improve foamability.

[B] The propellant may be composed of only carbon dioxide, but it is preferable to use both carbon dioxide and liquefied petroleum gas from the viewpoint of using up the contents as much as possible while obtaining the effect of promoting blood circulation.
Compared with foams formed by a propellant other than carbon dioxide, foams containing carbon dioxide may be defoamed by the hair washing operation, but as described above [A] By blending the three components into the stock solution, it is possible to suppress the defoaming.

[B] The propellant is preferably 0.5 parts by mass or more and 30 parts by mass or less, more preferably 1 part by mass or more and 20 parts by mass or less, and further 2 parts by mass or more and 15 parts by mass or less with respect to 100 parts by mass of the stock solution. preferable. By setting the filling amount of the propellant within the above range, the stock solution can be efficiently jetted.

(container)
The container in the foaming aerosol product of the present embodiment is preferably a known pressure-resistant container, and the material thereof is metal such as aluminum, aluminum alloy, tinplate, and steel. Furthermore, the metal container may have a plated surface. Further, the container may have a resin layer laminated on the inner surface, or may have an inner bag inside. Further, the container may or may not have an inner bag filled with [A] concentrate and [B] propellant.

(gauge pressure)
From the viewpoint of safety, the gauge pressure of the container in the foaming aerosol product of the present embodiment is 0.80 MPa or less, preferably 0.65 MPa or less, at a temperature of 25°C.

(Application and hair washing method)
The foaming aerosol product of the present embodiment can be used not only for shampooing, but also for hair washing such as scalp massage and scalp spa, which requires a relatively long treatment time compared to shampoo. is provided. The hair washing includes washing of the hair and scalp. Here, treatment time such as scalp massage or scalp spa is, for example, 5 minutes or more and 20 minutes or less.
When using the foam formed by the foaming aerosol product of the present embodiment for hair washing, scalp massage, scalp spa, etc., the foam does not easily disappear during and after the treatment. It is easy to apply because it improves the finger combability of the hair and reduces the creak of the hair during washing.

EXAMPLES The present invention will be specifically described below based on Examples, but the present invention is not limited to these Examples.

(Preparation of stock solution)
The components shown in Tables 1, 3, and 5 were mixed with water to prepare stock solutions (A-1 to A-4, B-1 to B-4), respectively.
As the N-acylglutamate, sodium N-coconut fatty acid acyl-L-glutamate is used, as the α-olefinsulfonate, sodium tetradecenesulfonate is used, and as the alkyldimethylaminoacetic acid betaine, lauryldimethylaminoacetic acid is used. Betaine was used.

(Preparation of Examples 1 to 4, Comparative Example 1, and Reference Examples A to C)
Each stock solution prepared above and the propellant were mixed so that the propellant was 7.1 parts by mass with respect to 92.9 parts by mass of the stock solution, and filled in an aluminum pressure-resistant container. , Tables 4 and 6, foaming aerosol products of Examples 1 to 4, Comparative Example 1 and Reference Examples A to C were obtained. The composition of the propellant was 1.1 parts by mass of isopentane, 4.8 parts by mass of LPG, and 1.2 parts by mass of carbon dioxide.

(Evaluation of state of foam after ejection (before foaming))
The evaluation of the state of foam after ejection (before foaming) was performed according to the following evaluation method and evaluation criteria.

(Evaluation method)
3 g of the content was discharged from each of the foaming aerosol products of Examples 1 to 4, Comparative Example 1, and Reference Examples A to C, and the discharged foam-like discharge was compared with the standard to determine the foam after discharge. The state (the amount of foam (the size of the entire foam)) was visually evaluated. Each evaluation result was obtained through discussion by three panelists who conduct evaluations on a daily basis.

(Evaluation criteria)
◯: The amount of foam is large compared to the standard.
-: The amount of foam is equivalent compared to the standard.
x: The amount of foam is small compared to the standard.

(Evaluation of foam volume after foaming and foam quality after foaming)
Each evaluation of foam volume after foaming and foam quality after foaming was performed according to the following evaluation methods and evaluation criteria.

Randomly selected Japanese women with hair longer than shoulders were rinsed with warm water and then applied different effervescent aerosol product squirts to the left and right halves of the woman's head. bottom. Specifically, 3 g of the foamy discharge discharged from the reference foaming aerosol product (Example 1 or Comparative Example 1) was applied to one wet hair, and the other wet hair was evaluated. 3 g of foamy discharges discharged from the foaming aerosol products of Examples 1 to 4, Comparative Example 1, and Reference Examples A to C were applied, and the reference and evaluation target foamy discharges were not mixed. Thus, lathering was carried out with the fingers for about 2 minutes. After foaming, the amount and quality of foam present on the left and right hairs were visually evaluated (evaluation of "foam volume after foaming" and "foam quality after foaming"). Each evaluation result was obtained through discussion by three panelists who conduct evaluations on a daily basis.

(Evaluation criteria)
The evaluation criteria for the amount of foam after foaming and the quality of foam after foaming are shown below.

Amount of foam after foaming ◯: The amount of foam is large compared to the standard.
-: The amount of foam is equivalent compared to the standard.
x: The amount of foam is small compared to the standard.

Foam quality after foaming ◯: Superior in foam creaminess (amount of fine foam) compared to the standard.
-: The creaminess of the foam (the amount of fine foam) is equivalent to that of the standard.
x: Inferior in foam creaminess (amount of fine bubbles) compared to the standard.

(Evaluation of foam retention)
Evaluation of foam retention was performed according to the following evaluation method and evaluation criteria.

(Evaluation method)
A plurality of hair tresses each having a length of 45 cm and a weight of 7.5 g were prepared from Japanese hair of the same person that had undergone hair dyeing treatment and had damaged ends. After rinsing the hair tresses with warm water for about 5 seconds, the foamy discharge ejected from the foaming aerosol products of Examples 1 to 4, Comparative Example 1, and Reference Examples A to C was applied to each wet hair tress. 0.5 g of the product was applied to the hair tress and lathered on the tress with fingers for 30 seconds. After lathering, the hair tress was allowed to stand for 2 minutes, and the remaining foam on the tress was scraped off and transferred to a 50 mL or 200 mL graduated cylinder, and the foam transferred to the graduated cylinder was evaluated according to the following evaluation criteria. In addition, evaluation was performed by one panelist who conducts evaluation on a daily basis.

(Evaluation criteria)
◯: The amount of foam transferred to the graduated cylinder is large compared to the standard.
Equivalent: Equivalent amount of foam transferred to the graduated cylinder compared to the reference.
x: The amount of foam transferred to the graduated cylinder is small compared to the standard.

It was confirmed that Example 1 was excellent in foam volume, foam quality, and foam retention after foaming when Comparative Example 1 was used as a reference. In particular, in Example 1, the total amount of the amphoteric surfactant and the anionic surfactant blended in the stock solution was less than in Comparative Example 1, and although the irritation to the scalp was suppressed to a small extent, after lathering It was superior to Comparative Example 1 in terms of foam volume, foam quality and foam retention.
During the treatment, in Comparative Example 1, it was confirmed that the amount of foam on the hair decreased, but in Example 1, it was confirmed that the amount of foam on the hair was maintained or increased.

According to Example 2-3 above, even when charcoal (Binchotan charcoal with a volume average particle size of 50 μm or less) was added to the stock solution, the amount of foam after foaming, foam quality, and foam It was confirmed that it is excellent in durability.
According to Example 4, when the content of charcoal in the stock solution was large, the foam quality after foaming was excellent, but the foam volume and foam retention after foaming were inferior. However, it was confirmed that Example 4 was superior to Comparative Example 1 not only in foam quality after foaming but also in foam volume and foam retention after foaming (not shown in the table).

In the above Reference Examples A to C, the total amount of the amphoteric surfactant and the anionic surfactant was the same as in Comparative Example 1 (because the amphoteric surfactant was not blended, the anionic surfactant ) and different types of anionic surfactants were examined, but it was confirmed that all of them were inferior to Comparative Example 1 in terms of foam quality and foam volume after foaming.

Claims (5)

A foaming aerosol product for hair washing, comprising:
[A] N-acyl glutamate, α-olefin sulfonate , betaine alkyldimethylaminoacetate , and a stock solution containing water , and [B] a propellant containing carbon dioxide are filled in a container ,
A foaming aerosol product , wherein the content of water in the stock solution is 70% by mass or more . A foaming aerosol product for hair washing, comprising:
[A] Stock solution containing N-acyl glutamate, α-olefin sulfonate, and betaine alkyldimethylaminoacetate, and
[B] Propellant containing carbon dioxide
is filled into the container and
A foaming aerosol product, wherein the total amount of the anionic surfactant and the amphoteric surfactant in the stock solution is 15% by mass or less. 2. The foaming aerosol product according to claim 1 , wherein the total content of the anionic surfactant and the amphoteric surfactant in the stock solution is 15% by mass or less. 4. The foaming aerosol product according to any one of claims 1 to 3, wherein charcoal is blended in said stock solution. A hair washing method comprising washing hair with the foaming aerosol product according to any one of claims 1 to 4 .