JP2024083166A - Skin cleansing agent - Google Patents

Abstract

[Problem] To provide a skin cleansing agent that has excellent performance in removing keratin plugs and leaves the skin feeling moisturized after cleansing. [Solution] The skin cleansing agent contains a higher fatty acid salt having 8 to 22 carbon atoms, a polyhydric alcohol, spherical crystalline cellulose, polyquaternium-7, and a betaine-based amphoteric surfactant. [Selected Figures] None

Description

This disclosure relates to a skin cleanser.

Skin cleansing products such as facial cleansing creams are sometimes required to contain scrubbing agents that not only remove sebum from the skin, but also remove dirt that has clogged pores (so-called keratin plugs).
As an example of a skin cleanser containing a scrubbing agent, Patent Document 1 discloses a skin cleanser containing crystalline cellulose having an average particle size of 100 μm or less, polyquaternium-7, a salt of a higher fatty acid having 8 to 22 carbon atoms, and a polyhydric alcohol.
Patent Document 2 discloses a skin cleanser composition containing component (A): a higher fatty acid and/or a salt thereof, component (B): fibrous cellulose, component (C): a cationic polymer, and component (D): water, in which the content of component (A) is 5.0 to 50.0 mass%, the content of component (B) is 1.0 to 10.0 mass%, and the content of component (C) is 0.05 to 2.0 mass%.

JP 2014-221743 A JP 2020-079216 A

Facial cleansers containing scrubbing agents as described in Patent Documents 1 and 2 above can make the skin feel tight after cleansing, making it difficult to obtain a moisturizing feeling.
Therefore, there has been a strong demand for the development of a skin cleanser that not only has excellent performance in removing dirt clogged in pores (hereinafter also referred to as keratin plug removal performance) but also provides a moisturizing feeling after cleansing the skin.

One embodiment of the present disclosure aims to provide a skin cleanser that has excellent keratin plug removal performance and provides a moisturizing feeling after cleansing the skin.

The means for solving the above problems are as follows.
<1> A skin cleansing agent comprising a salt of a higher fatty acid having 8 to 22 carbon atoms, a polyhydric alcohol, spherical crystalline cellulose, polyquaternium-7, and a betaine-based amphoteric surfactant.
<2> The skin cleansing agent according to <1>, wherein the betaine-based amphoteric surfactant comprises at least one selected from the group consisting of sodium cocoamphoacetate, lauramidopropyl betaine, and palm kernel fatty acid amidopropyl betaine.
<3> The skin cleansing agent according to <1> or <2>, wherein the betaine-based amphoteric surfactant is lauramidopropyl betaine.
<4> The skin cleansing agent according to any one of <1> to <3>, wherein the spherical crystalline cellulose has a particle size range of 100 μm to 700 μm.
<5> The skin cleansing agent according to any one of <1> to <4>, wherein the spherical crystalline cellulose has a particle size range of 150 μm to 300 μm.
<6> The skin cleansing agent according to any one of <1> to <5>, wherein the content of the spherical crystalline cellulose is 0.3% by mass to 1.0% by mass, based on the total mass of the skin cleansing agent.

According to one embodiment of the present disclosure, it is possible to provide a skin cleanser that has excellent keratin plug removal performance and provides a moisturizing feeling after cleansing the skin.

The skin cleansing agent of the present disclosure will be described in detail below. The explanation of the requirements described below may be based on a representative embodiment of the present disclosure, but the present disclosure is not limited to such an embodiment, and can be implemented with appropriate modifications within the scope of the purpose of the present disclosure.

In the present disclosure, a numerical range indicated using "to" means a range that includes the numerical values before and after "to" as the lower and upper limits, respectively.
In the numerical ranges described in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in the present disclosure. In addition, in the numerical ranges described in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the examples.

In the present disclosure, a combination of two or more preferred aspects or embodiments is a more preferred aspect or embodiment.
In the present disclosure, when a plurality of substances corresponding to each component are present in the composition, the amount of each component in the composition means the total amount of the plurality of substances present in the composition, unless otherwise specified.

<Skin cleansing agent>
The skin cleansing agent of the present disclosure contains (A) a salt of a higher fatty acid having 8 to 22 carbon atoms, (B) a polyhydric alcohol, (C) spherical crystalline cellulose, (D) polyquaternium-7, and (E) a betaine-based amphoteric surfactant.

As mentioned above, skin cleansing agents containing scrubbing agents have the ability to remove keratin plugs, but they often fail to provide a moisturizing feeling after cleansing the skin.
The skin cleansing agent of the present disclosure has excellent performance in removing keratin plugs and also provides a moisturizing feeling after cleansing the skin.
This is thought to be because the product contains spherical crystalline cellulose and a betaine-based amphoteric surfactant together with a higher fatty acid salt having 8 to 22 carbon atoms and a polyhydric alcohol, which allows the spherical crystalline cellulose to exert its ability to remove keratin plugs when cleansing the skin, and furthermore, the presence of the betaine-based amphoteric surfactant prevents the skin from feeling tight after cleansing, providing a feeling of moisturization.

Each ingredient is explained below.

[Salts of higher fatty acids having 8 to 22 carbon atoms]
The skin cleansing agent of the present disclosure contains a salt of a higher fatty acid having 8 to 22 carbon atoms (hereinafter, also simply referred to as a "higher fatty acid salt").

The higher fatty acid salt is a salt of a higher fatty acid having 8 to 22 carbon atoms.
The aliphatic hydrocarbons contained in the higher fatty acid having 8 to 22 carbon atoms may be either saturated or unsaturated, and may be either straight-chain or branched-chain.
Specific examples of higher fatty acids having 8 to 22 carbon atoms include lauric acid, myristic acid, palmitic acid, stearic acid, arachidonic acid, behenic acid, isostearic acid, oleic acid, 2-palmitoleic acid, petroselinic acid, elaidic acid, ricinoleic acid, linoleic acid, linoelaidic acid, linolenic acid, coconut oil fatty acid, palm kernel oil fatty acid, and beef tallow fatty acid.

Examples of bases for forming salts with higher fatty acids include inorganic bases such as sodium, potassium, and magnesium; alkanolamines such as ammonium, monoethanolamine, diethanolamine, triethanolamine, 2-amino-2-methylpropanol, and 2-amino-2-methylpropanediol; and basic amino acids such as lysine and arginine. Of these, alkali metals such as sodium and potassium are preferred.

The higher fatty acid salt may be blended into the skin cleansing agent as a raw material component, or the higher fatty acid and the basic component may be blended independently into the skin cleansing agent to form the higher fatty acid salt in the composition. The higher fatty acid may be the above-mentioned higher fatty acid, and the basic component may be potassium hydroxide, sodium hydroxide, calcium hydroxide, triethanolamine, tromethane, arginine, etc.
Preferred examples of the higher fatty acid salt include potassium myristate, potassium palmitate, potassium stearate, and potassium laurate.
Preferred combinations of higher fatty acids and basic components include myristic acid and potassium hydroxide, palmitic acid and potassium hydroxide, stearic acid and potassium hydroxide, and lauric acid and potassium hydroxide.

As the higher fatty acid salt, commercially available products can also be used.
Commercially available higher fatty acid salts include, for example, NONSAL LK-2, NONSAL MK-1, NONSAL PK-1, and NONSAL SK-1 manufactured by NOF Corporation.
Commercially available higher fatty acids include, for example, Lunac MY-98, Lunac P-95, Lunac L-98, and Lunac S-98 manufactured by Kao Corporation.
Furthermore, examples of commercially available basic components include 48% potassium hydroxide solution manufactured by Kanto Chemical Co., Ltd., and TRIS AMINO (registered trademark) ULTRA PC manufactured by Angus Chemical Company.

The higher fatty acid salts may be used alone or in combination of two or more.
From the viewpoint of foaming, the content of the higher fatty acid salt is preferably 15% by mass to 60% by mass, more preferably 20% by mass to 50% by mass, and even more preferably 25% by mass to 35% by mass, relative to the total mass of the skin cleanser.
When the higher fatty acid and the basic component are mixed independently, the content of the higher fatty acid salt is represented by the total amount of the higher fatty acid and the basic component.

[Polyhydric alcohol (B)]
The skin cleansing agent of the present disclosure contains a polyhydric alcohol.
The polyhydric alcohol is not particularly limited as long as it is a dihydric or higher alcohol.

Examples of polyhydric alcohols include glycerin, diglycerin, triglycerin, polyglycerin, 3-methyl-1,3-butanediol, 1,3-butylene glycol, isoprene glycol, polyethylene glycol, 1,2-pentanediol, 1,2-hexanediol, propylene glycol, dipropylene glycol, ethylene glycol, diethylene glycol, neopentyl glycol, propanediol, glucoside, glyceryl glucoside, trehalose, glycosyl trehalose, xylitol, fructose, lactose, sorbitol, maltitol, and hydrogenated starch hydrolysates.
Among these, from the viewpoint of enhancing the moisturizing feeling after cleansing, the polyhydric alcohol is preferably glycerin, 1,3-butylene glycol, polyethylene glycol (average molecular weight of 10,000 or less), glycosyl trehalose, sorbitol, glyceryl glucoside, or hydrogenated starch hydrolysate, and more preferably glycerin, sorbitol, glycosyl trehalose, polyethylene glycol (average molecular weight of 200 to 2,000), or hydrogenated starch hydrolysate.

As the polyhydric alcohol, commercially available products can also be used.
Examples of commercially available products include PEG-6, PEG-20, and PEG-32 manufactured by NOF Corporation, glycerin manufactured by New Japan Chemical Co., Ltd., sorbitol manufactured by Kao Corporation, and an aqueous solution of hydrogenated starch hydrolysate manufactured by Bussan Food Science Co., Ltd.

The polyhydric alcohols may be used alone or in combination of two or more kinds.
From the viewpoint of obtaining a moisturizing feeling after cleansing, the content of the polyhydric alcohol is preferably 5% by mass to 60% by mass, more preferably 10% by mass to 50% by mass, and even more preferably 15% by mass to 50% by mass, based on the total mass of the skin cleanser.

[Spherical crystalline cellulose (C)]
The skin cleansing agent of the present disclosure contains spherical crystalline cellulose.
Crystalline cellulose has a CAS number of 9004-34-6 and is a component obtained by partially depolymerizing α-cellulose obtained as pulp from fibrous plants with a mineral acid and purifying it.
The size and shape of crystalline cellulose vary depending on the processing method (e.g., granulation method), but as long as it is spherical, it can be used in the skin cleansing agent of the present disclosure without any particular limitation.

Spherical crystalline cellulose refers to crystalline cellulose having a sphericity of 1.0 to 1.3, calculated by "length of major axis/length of minor axis."
The sphericity of the spherical crystalline cellulose is 1.0 to 1.3, and from the viewpoint of excellent performance in removing keratin plugs, it is preferably 1.0 to 1.2, and more preferably 1.0 to 1.1.

From the viewpoint of excellent keratin plug removal performance and low irritation (low friction), the particle size range of the spherical crystalline cellulose is preferably 100 μm to 700 μm, more preferably 150 μm to 500 μm, and even more preferably 150 μm to 300 μm.

The particle size range of spherical crystalline cellulose means the range within which the particle size (i.e., particle size) of each spherical crystalline cellulose falls. In other words, in the case of spherical crystalline cellulose with a particle size range of 100 μm to 700 μm, each spherical crystalline cellulose has a minimum particle size of 100 μm and a maximum particle size of 700 μm.

The sphericity and particle size range of crystalline cellulose are determined by the following method.
The skin cleansing agent containing the crystalline cellulose to be measured is photographed under an electron microscope (magnification x 50), and 10 crystalline cellulose particles are extracted from the photographed image. The lengths of the major and minor axes of the 10 extracted crystalline cellulose particles are measured, and the sphericity is calculated by dividing the major axis length by the minor axis length (i.e., "major axis length/minor axis length"). The arithmetic mean value of the sphericities of the 10 particles obtained is calculated, and this is regarded as the sphericity of the crystalline cellulose.
In addition, the major axis of the extracted 10 crystalline cellulose particles is taken as the particle diameter (i.e., particle size), and the minimum and maximum particle diameters of the obtained 10 particles are determined, and these are taken as the particle size range of spherical crystalline cellulose.
Here, the length of the long axis is the distance between A-A' when the crystalline cellulose in the captured image is sandwiched between two parallel lines A and A' so that they are in contact with each other, and the length of the short axis is the distance between B-B' when the crystalline cellulose is sandwiched between two parallel lines B and B' that are perpendicular to the two parallel lines A and A' that determine the length of the long axis.

In this disclosure, when catalog values are available for the sphericity and particle size range of crystalline cellulose, the catalog values are used as a matter of preference.

As the crystalline cellulose, commercially available products can also be used.
Examples of commercially available products include the Cellophea (registered trademark) series manufactured by Asahi Kasei Chemicals Corporation, such as Cellophea CP-102 (sphericity 1.2, particle size range 106 μm to 212 μm), Cellophea CP-203 (sphericity 1.1, particle size range 150 μm to 300 μm), Cellophea CP-305 (sphericity 1.1, particle size range 300 μm to 500 μm), Cellophea CP-507 (sphericity 1.1, particle size range 500 μm to 710 μm), and Cellophea CP-708 (sphericity 1.2, particle size range 710 μm to 850 μm).

The spherical crystalline cellulose may be used alone or in combination of two or more kinds.
From the viewpoint of obtaining keratin plug removal performance and suppressing irritation to the skin, the content of spherical crystalline cellulose is preferably 0.05% by mass to 1.0% by mass, more preferably 0.1% by mass to 1.0% by mass, even more preferably 0.2% by mass to 1.0% by mass, particularly preferably 0.2% by mass to 0.6% by mass, and most preferably 0.2% by mass to 0.4% by mass, relative to the total mass of the skin cleanser.
By making the content of spherical crystalline cellulose 0.05% by mass or more based on the total mass of the skin cleanser, it becomes easier to obtain the ability to remove keratin plugs. Also, by making the content of spherical crystalline cellulose 1.0% by mass or less based on the total mass of the skin cleanser, it becomes harder to feel the grainy feeling derived from spherical crystalline cellulose, and it becomes easier to suppress irritation to the skin.

[Polyquaternium-7 (D)]
The skin cleanser of the present disclosure contains polyquaternium-7.
Polyquaternium-7, CAS number 26590-05-6, is a polymer of a quaternary ammonium salt obtained from acrylic acid amide and dimethyldiallylammonium chloride.

Polyquaternium-7 may also be a commercially available product.
Examples of commercially available products include Marcoat 550 (manufactured by Lubrizol) and Lipoflow MN (manufactured by Lion Corporation).

From the viewpoint of moisturizing feeling, the content of polyquaternium-7 is preferably 0.01% by mass to 5.0% by mass, more preferably 0.05% by mass to 3.0% by mass, and even more preferably 0.1% by mass to 1.0% by mass, based on the total mass of the skin cleanser.

[Betaine-based amphoteric surfactant (E)]
The skin cleansing agent of the present disclosure contains a betaine-based amphoteric surfactant.
The betaine-based amphoteric surfactant refers to an amphoteric compound having both a cationic moiety and an anionic moiety in the molecule, and having surface activity.

Examples of betaine-based amphoteric surfactants include sodium cocoamphoacetate, lauramidopropyl betaine, palm kernel fatty acid amidopropyl betaine, cocamidopropyl betaine, lauryl betaine, etc. Among them, from the viewpoint of enhancing the moisturizing feeling of the skin after cleansing, it is preferable that the betaine-based amphoteric surfactant contains one or more selected from the group consisting of sodium cocoamphoacetate, lauramidopropyl betaine, and palm kernel fatty acid amidopropyl betaine, and it is preferable that it is lauramidopropyl betaine.

As the betaine-based amphoteric surfactant, commercially available products can also be used.
Examples of commercially available products include Softazoline (registered trademark) LPB-R, Softazoline (registered trademark) CL-R, and Softazoline (registered trademark) PKPB (manufactured by Kawaken Fine Chemicals Co., Ltd.).

The betaine-based amphoteric surfactants may be used alone or in combination of two or more kinds.
From the viewpoint of obtaining a moisturizing feeling after cleansing, the content of the betaine-based amphoteric surfactant is preferably 0.1% by mass to 1.0% by mass, more preferably 0.2% by mass to 0.8% by mass, and even more preferably 0.4% by mass to 0.8% by mass, relative to the total mass of the skin cleanser.

[Anionic Surfactant (F)]
From the viewpoint of improving cleaning performance, it is preferable that the skin cleansing agent of the present disclosure further contains an anionic surfactant.
Preferred examples of the anionic surfactant include sodium cocoyl methyl taurate, sodium cocoyl methyl taurate, sodium lauroyl glutamate, etc., which can function as a cleaning component. Of these, sodium cocoyl methyl taurate is preferred as the anionic surfactant.

From the viewpoint of cleansing properties and moisturizing properties, the content of the anionic surfactant is preferably 0.5% by mass to 2.5% by mass, more preferably 1.0% by mass to 2.0% by mass, and even more preferably 1.0% by mass to 1.5% by mass, based on the total mass of the skin cleanser.

The ratio of anionic surfactant to betaine-based amphoteric surfactant (anionic surfactant/betaine-based amphoteric surfactant) is preferably 0.1 to 10, more preferably 0.5 to 7, and even more preferably 1 to 3.

[Other ingredients]
In addition to the above-mentioned components, the skin cleansing agent of the present disclosure may contain components known as additives for skin cleansing agents, if necessary. Examples of components known as additives for skin cleansing agents include components that can function as moisturizing components, anti-inflammatory components, bactericidal components, cationic surfactants, nonionic surfactants, colorants, antioxidants, preservatives, etc. The other components may each have two or more functions.
The moisturizing component may be any component other than those already mentioned that can function as a moisturizing component, and preferred examples include lactobacillus fermentation filtrate, pear juice fermentation filtrate, blackberry extract, bilberry leaf extract, artichoke leaf extract, etc.
The anti-inflammatory component may be any component that can function as an anti-inflammatory component, and examples thereof include stearyl glycyrrhetinate, β-glycyrrhizinic acid, glycyrrhetinic acid, allantoin, and tranexamic acid.
The bactericidal component may be any component capable of functioning as a bactericidal component, and examples thereof include salicylic acid, sulfur, and isopropylmethylphenol.
An example of the cationic surfactant is polyquaternium-6, which is a cationic polymer.
Examples of nonionic surfactants include nonionic surfactants having a linear fatty acid ester structure having 8 to 22 carbon atoms, such as glyceryl stearate, glyceryl myristate, and glyceryl palmitate.
Examples of colorants include titanium oxide, caramel, iron oxide, and copper chlorophyllin Na.
Examples of antioxidants include tocopherol and its derivatives, ascorbic acid and its derivatives, astaxanthin, and the like.
Examples of preservatives include paraben, propylparaben, phenoxyethanol, and EDTA.
Other components such as tocopherol acetate, pantothenyl alcohol, pyridoxine hydrochloride, nicotinamide, urea, arbutin, ascorbic acid glucoside, and magnesium ascorbyl phosphate may also be contained as necessary.
The content of these other ingredients is, for example, preferably 0.001% by mass to 10% by mass, and more preferably 0.01% by mass to 5% by mass, relative to the total mass of the skin cleansing agent.

[solvent]
The skin cleansing agent of the present disclosure may contain a solvent.
Examples of the solvent include water and liquids other than polyhydric alcohols (specifically, polar oils).
The content of the solvent is, for example, preferably 5% by mass to 50% by mass, and more preferably 10% by mass to 30% by mass, relative to the total mass of the skin cleanser.

[Application]
The skin cleanser of the present disclosure is preferably used as a facial cleanser or a body cleanser, and more preferably used as a facial cleanser.

[Production method]
The skin cleansing agent of the present disclosure can be produced according to known methods.
For example, the skin cleansing agent of the present disclosure can be produced by mixing the essential components of the skin cleansing agent of the present disclosure and any optional components that can be added as necessary using a stirrer, impeller stirring, homomixer, or the like.

The present invention will be described in more detail below with reference to the following examples. The embodiments described below are examples of the configuration of the present invention, and the present invention is not limited to the following embodiments. In the following description, percentages are based on mass unless otherwise specified.

[Examples 1 to 9, Comparative Examples 1 to 5]
Based on the formulations shown in Tables 1 and 2, the skin cleansing agents of Examples 1 to 9 and Comparative Examples 1 to 5 were prepared in a conventional manner.
In the table, the numerical values of the blended components are the contents (blended amounts) in units of mass %. In the table, "-" indicates that the corresponding component is not blended.

The details of each component shown in Tables 1 and 2 are as follows.
Glycosyl trehalose: Tornare (registered trademark) manufactured by Hayashibara Co., Ltd.
Cellphea CP-203: Cellphea CP-203 manufactured by Asahi Kasei Chemicals Corporation (sphericity 1.1, particle size range 150 μm to 300 μm)
CEOLUS KG-1000: CEOLUS KG-1000 (non-spherical crystalline cellulose, average particle size 50 μm) manufactured by Asahi Kasei Chemicals Corporation
CEOLUS PH-F20JP: CEOLUS PH-F20JP (non-spherical crystalline cellulose, average particle size 20 μm) manufactured by Asahi Kasei Chemicals Corporation
Cellphea CP-305: Cellphea CP-305 manufactured by Asahi Kasei Chemicals Corporation (sphericity 1.1, particle size range 300 μm to 500 μm)
Polyquaternium-7: MERQUAT 550 manufactured by Lubrizol
Polyquaternium-6: Merquat (registered trademark) 100 Polymer manufactured by Lubrizol Japan, Ltd.
Additives (mixture of antioxidants, chelating agents, and moisturizing agents)

The prepared skin cleansers were evaluated for moisturizing feeling after cleansing the skin and for their ability to remove keratin plugs according to the evaluation criteria described below. The evaluation results are shown in Tables 1 and 2.

[Moisturizing sensation]
Each example of skin cleanser was filled into a tube-type container with a hinged cap to prepare a bottled facial cleanser. Seven monitors evaluated the prepared facial cleanser for moisturizing sensation after cleansing using the following method.
1.5g of face wash foam is added with 12.5mL of water and foamed by hand, then the obtained foam is placed on the skin (forearm), spread and rinsed.Then, the water on the spread part is lightly wiped off, and the degree of moisturizing feeling on the skin from just before drying to after drying is evaluated using the following ranks.A indicates the rank with the best moisturizing feeling.The rank selected by each monitor with the most number of selections is regarded as the evaluation result of moisturizing feeling, and when the number of selections is the same, the better rank is regarded as the evaluation result of moisturizing feeling.

-Moisturizing sensation evaluation rank-
A: I can feel a strong moisturizing sensation on my skin.
B: The skin feels moisturized.
C: There is a slight feeling of moisture on the skin.
D: No moisturizing sensation on the skin.

[Removal of keratin plugs]
Each example of the skin cleanser was filled into a tube-type container with a hinged cap to prepare a bottled facial cleanser. The facial cleanser thus prepared was evaluated for its ability to remove keratin plugs by the following method.
A silicone rubber sheet was prepared in which artificial keratin plugs were embedded using an artificial keratin plug composition prepared by mixing keratin powder and artificial sebum at a ratio of 1:1 and coloring the composition with carbon black.
100 mg of face wash foam was applied to the silicone rubber sheet, rubbed with the hand 120 times, and then rinsed with warm water for 2 minutes. The silicone rubber sheet was photographed with a digital camera before and after washing, and the area of the artificial keratin plug was quantified by image analysis.
The difference between the area of the artificial keratin plug before and after washing was used as an index of the ability to remove the keratin plug. The greater the difference in the area of the artificial keratin plug before and after washing, the better the ability to remove the keratin plug.
In the present disclosure, the removability of keratin plugs is preferably such that the difference in the area of the artificial keratin plugs before and after washing is 8500px or more, that is, the ranks are "A", "B", and "C".

- Evaluation criteria for keratin plug removal -
A: The difference in the area of the artificial keratin plug before and after washing is 9,500 px (pixels) or more.
B: The difference in the area of the artificial keratin plug before and after washing is 9,000 px or more and less than 9,500 px.
C: The difference in the area of the artificial keratin plug before and after washing is 8,500 px or more and less than 9,000 px.
D: The difference in the area of the artificial keratin plug before and after washing is 8000px or more and less than 8500px.
E: The difference in the area of the artificial keratin plug before and after washing is less than 8000px.

As is clear from the results shown in Tables 1 and 2, the skin cleansing agent of the example has excellent performance in removing keratin plugs and provides a moisturizing feeling after cleansing the skin.

Claims (6)

a salt of a higher fatty acid having 8 to 22 carbon atoms;
A polyhydric alcohol;
Spherical crystalline cellulose;
Polyquaternium-7,
A betaine-based amphoteric surfactant,
A skin cleanser containing: The skin cleansing agent according to claim 1, wherein the betaine-based amphoteric surfactant comprises one or more selected from the group consisting of sodium cocoamphoacetate, lauramidopropyl betaine, and palm kernel fatty acid amidopropyl betaine. The skin cleansing agent according to claim 1 or 2, wherein the betaine-based amphoteric surfactant is lauramidopropyl betaine. The skin cleansing agent according to claim 1 or 2, wherein the particle size range of the spherical crystalline cellulose is 100 μm to 700 μm. The skin cleansing agent according to claim 4, wherein the particle size range of the spherical crystalline cellulose is 150 μm to 300 μm. 3. The skin cleansing agent according to claim 1, wherein the content of the spherical crystalline cellulose is 0.3% by mass to 1.0% by mass relative to the total mass of the skin cleansing agent.