Skin cleansing agent composition

Abstract

To provide a skin detergent composition that has both makeup removal effect and low irritation, by which skin moist feeling is improved and creak of skin is reduced, and that has effect of reducing an amount of inflammatory cytokine, and has excellent high-temperature stability.SOLUTION: A skin detergent composition contains: (A) anionic surfactant including amino acid-based surfactant; (B) at least either one selected from cationic polymer including dimethyldiallylammonium chloride and cationized polysaccharides; (C) at least either one selected from salicylic acid or a salt thereof, and α-hydroxy acid or a salt thereof; and (D) vitamin C derivative.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a skin cleansing composition. [Background technology]

[0002] Traditionally, skin cleansing compositions such as hand soaps and facial cleansers have been desired to possess not only sufficient bactericidal power, but also to be low-irritating to the skin, have excellent usability (leaving the skin feeling moisturized and not squeaky after use), makeup removal effect, and anti-inflammatory effect.

[0003] In recent years, skin cleansing compositions containing fatty acid salts, cationic polymers, and amino acid-based surfactants have been proposed with the aim of providing a skin cleansing composition that exhibits high bactericidal power even when using low concentrations of fatty acid salts, has excellent foaming performance such as foam elasticity, good foaming ability, and fine foam texture, and is mild on the skin (see, for example, Patent Document 1). Furthermore, skin cleansing compositions combining polyquaternium-10, a cationic polymer, and salicylic acid, an antibacterial component, have been proposed with the aim of providing excellent body odor suppression effects (antibacterial performance) (see, for example, Patent Document 2).

[0004] However, the compositions described in Patent Documents 1 and 2 above were not satisfactory in terms of sufficient makeup removal effect, low irritation, inflammation suppression, and usability (moisturizing effect and lack of tightness on the skin after use).

[0005] Therefore, a skin cleansing composition that achieves both effective makeup removal and low irritation, while also providing excellent moisturizing properties, preventing skin dryness, reducing inflammatory cytokine levels, and maintaining high-temperature stability, has yet to be provided. There is a strong desire for its rapid development. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2014-231481 [Patent Document 2] Japanese Patent Publication No. 2014-101356 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The present invention aims to solve the aforementioned problems of the conventional approach and achieve the following objectives. Specifically, it aims to provide a skin cleansing composition that combines makeup removal effectiveness with low irritation, while also exhibiting excellent moisturizing properties, non-greasy skin, reduced levels of inflammatory cytokines, and high-temperature stability. [Means for solving the problem]

[0008] The present inventors, through diligent research to achieve the above objectives, have found that the skin cleansing composition of the present invention contains (A) an anionic surfactant including an amino acid-based surfactant, (B) at least one selected from a cationic polymer including dimethyldiallylammonium chloride and cationized polysaccharides, (C) at least one selected from salicylic acid or its salt and α-hydroxy acid or its salt, and (D) a vitamin C derivative, thereby achieving both makeup removal effectiveness and low irritation, as well as excellent skin moisturizing effect, lack of skin tightness, effect of reducing inflammatory cytokine levels, and high-temperature stability.

[0009] The present invention is based on the aforementioned findings by the inventors, and the means for solving the aforementioned problems are as follows. <1> The skin cleansing composition is characterized by containing (A) an anionic surfactant including an amino acid-based surfactant, (B) at least one selected from a cationic polymer containing dimethyldiallylammonium chloride and a cationized polysaccharide, (C) at least one selected from salicylic acid or a salt thereof and an α-hydroxy acid or a salt thereof, and (D) a vitamin C derivative. <2> The mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 22 or more and 40 or less, <1> This is a skin cleansing composition as described above. <3> The mass ratio of the content of component (B) to the content of component (C) [(B) / (C)] is 0.3 or more and 6.0 or less, <1> From the above <2> It is a skin cleansing composition as described in any of the above. <4> The aforementioned component (B) is at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer, The molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is 65% or more. <1> From the above <3> It is a skin cleansing composition as described in any of the above. <5> The former container is filled with the above <1> From the above <4> It is a skin cleansing composition as described in any of the above. [Effects of the Invention]

[0010] According to the present invention, the aforementioned problems of the conventional era can be solved, the aforementioned objectives can be achieved, and a skin cleansing composition can be provided that combines makeup removal effectiveness with low irritation, provides a moist feeling to the skin, prevents skin dryness, reduces the amount of inflammatory cytokines, and exhibits excellent high-temperature stability. [Modes for carrying out the invention]

[0011] (Skin cleansing agent composition) The skin cleansing composition of the present invention contains (A) an anionic surfactant including an amino acid-based surfactant, (B) at least one selected from a cationic polymer including dimethyldiallylammonium chloride and a cationized polysaccharide, (C) at least one selected from salicylic acid or a salt thereof and an α-hydroxy acid or a salt thereof, and (D) a vitamin C derivative, and may optionally contain other components. In addition, in this specification, the anionic surfactant containing an amino acid-based surfactant may be referred to as the "(A) component", at least any one selected from a cationic polymer containing dimethyldiallylammonium chloride and a cationized polysaccharide may be referred to as the "(B) component", at least any one selected from salicylic acid or its salt and an α-hydroxy acid or its salt may be referred to as the "(C) component", and a vitamin C derivative may be referred to as the "(D) component".

[0012] <Anionic surfactant containing an amino acid-based surfactant> The anionic surfactant containing the amino acid-based surfactant (A) is mainly contained to improve the makeup removal effect.

[0013] -Amino acid-based surfactant- The amino acid-based surfactant is not particularly limited and can be appropriately selected according to the purpose. For example, compounds represented by the following general formula (A4) can be mentioned. The amino acid-based surfactant may be used alone or in combination of two or more.

Chemical formula

[0014] In the general formula (A4), R 2 represents a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms. As the number of carbon atoms in the R 2 portion, 8 to 18 is preferable. In the general formula (A4), R 4 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. In the general formula (A4), R 5 and R 6 may be the same or different, and represent a hydrogen atom or -(CH2) m -COOM 2 . In the general formula (A4), m and n may be the same or different and represent numbers from 0 to 20. In the general formula (A4), M 1 and M 2 may be the same or different and each represents a hydrogen atom, an alkali metal, an alkaline earth metal, an alkanolamine, ammonium, or a basic amino acid.

[0015] The amino acid structure of the hydrophilic part of the amino acid surfactant is not particularly limited and can be appropriately selected according to the purpose. However, glycine, glutamic acid, and methylalanine are preferred.

[0016] Specific examples of the amino acid surfactant represented by the general formula (A4) include N-acyl-glycine such as N-cocoyl-glycine potassium (N-coconut oil fatty acid acyl glycine potassium) and its salts, N-acyl-N-carboxyethyl-glycine such as sodium N-myristoyl-N-carboxyethyl-glycine and its salts, sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, potassium N-coconut oil fatty acid acyl-L-glutamate, sodium N-palm fatty acid acyl-L-glutamate, sodium N-stearoyl-L-glutamate and other N-acylglutamates and their salts, potassium N-lauroyl-N-methyl-β-alanine, triethanolamine N-lauroyl-N-methyl-β-alanine, triethanolamine N-coconut oil fatty acid acyl-DL-alanine and other N-acyl-N-methyl-β-alanine and their salts, N-acyl-β-alanine such as triethanolamine N-cocoyl-β-alanine and its salts, and acyl sarcosine such as triethanolamine coconut oil fatty acid sarcosine and its salts. Among these, cocoyl glutamate salts and cocoyl glycine salts are preferred in terms of improving the makeup removal effect and the effect of reducing the amount of inflammatory cytokines.

[0017] There are no particular restrictions on the content of the amino acid-based surfactant, and it can be set appropriately depending on the purpose. However, from the viewpoint of makeup removal effect, high temperature stability, and low irritation, it is preferably 0.5% by mass or more and 20% by mass or less, and more preferably 1% by mass or more and 10% by mass or less, based on the total amount of the skin cleansing agent composition. It is preferable that the content of the amino acid-based surfactant is 0.5% by mass or more relative to the total amount of the skin cleansing composition, as this can resolve problems such as insufficient makeup removal effect or increased skin irritation. It is preferable that the content of the amino acid-based surfactant is 20% by mass or less of the total amount of the skin cleansing composition, as this can resolve problems such as poor high-temperature stability and increased skin irritation.

[0018] The aforementioned amino acid-based surfactant may be one that has been synthesized as appropriate, or a commercially available product may be used. Examples of commercially available amino acid-based surfactants include Amilite® GCK-11 (N-coconut oil fatty acid acylglycine potassium solution), Amilite® GCK-12K (N-coconut oil fatty acid acylglycine potassium solution), Amilite® GCS-12K (N-coconut oil fatty acid acylglycine sodium solution), Amilite® GCS-11 (N-coconut oil fatty acid acylglycine sodium), Amisoft® CS-11 (N-acyl-L-glutamate sodium), and Amisoft® LS-11 (N-acyl-L-glutamate sodium Amisoft® MS-11 (N-acyl-L-glutamate sodium), Amisoft® HS-11P (N-stearoyl-L-glutamate sodium), Amisoft® HS-11P(F) (N-stearoyl-L-glutamate sodium), Amilight® ACS-12 (N-coconut oil fatty acid acyl-L-alanine sodium solution) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), AminoSurfact® AMMS-P1 (N-acyl-L-glutamate sodium) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Examples include Sarcosinate MN (sodium myristoylmethylaminoacetate), NIKKOL Alaninate LN-30 (aqueous solution of sodium lauroylmethylalanine) (both manufactured by Nikko Chemicals Co., Ltd.), Alanone ACE (sodium coconut oil fatty acid methylalanine solution), Alanone AME (sodium N-myristoyl-N-methyl-β-alanine), Alanone ALE (sodium lauroylmethyl-β-alanine solution) (both manufactured by Kawaken Fine Chemicals Co., Ltd.), Energcol L-30AN (sodium lauroylmethyl-β-alanine solution) (manufactured by Lion Specialty Chemicals Co., Ltd.), Softilt AT-L (N-lauroyl N-methyl-β-alanine triethanolamine solution) (manufactured by NOF Corporation), Plantapon Amino SCG-L (disodium cocoyl glutamate), and Plantapon Amino KG-L (potassium cocoyl glycine) (both manufactured by BASF).

[0019] -Anionic surfactants other than amino acid-based surfactants- The skin cleansing composition of the present invention may contain an anionic surfactant other than the amino acid-based surfactant in addition to the amino acid-based surfactant. In this specification, anionic surfactants other than the amino acid-based surfactant may be referred to as "other anionic surfactants."

[0020] The aforementioned other anionic surfactants are not particularly limited and can be appropriately selected depending on the purpose. Examples include higher fatty acid salts, polyoxyethylene alkyl ether sulfates, and ether carboxylic acid-based surfactants. These may be used individually or in combination of two or more.

[0021] There are no particular restrictions on the aforementioned higher fatty acid salts, and they can be appropriately selected depending on the purpose. Examples include laurate, myristic acid, palmitate, and stearate. Among these, laurate and myristic acid are preferred because they improve the makeup removal effect and the reduction of inflammatory cytokine levels. These may be used individually or in combination of two or more.

[0022] There are no particular restrictions on the salt used in the aforementioned higher fatty acid salt; it can be appropriately selected depending on the purpose. Examples include alkali metal salts, amine salts, and amino acid salts. There are no particular restrictions on the alkali metal salt, and it can be appropriately selected depending on the purpose. Examples include sodium salts and potassium salts. The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples include ammonium salts, monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol. There are no particular restrictions on the amino acid salts mentioned above, and they can be appropriately selected depending on the purpose. Examples include lysine salts and arginine salts. Among these, alkali metal salts are preferred, and potassium salts are more preferred.

[0023] There are no particular restrictions on the polyoxyethylene alkyl ether sulfate, and it can be appropriately selected depending on the purpose. Examples include sodium polyoxyethylene (1) lauryl ether sulfate, sodium polyoxyethylene (2) lauryl ether sulfate, sodium polyoxyethylene (3) lauryl ether sulfate, sodium polyoxyethylene (4) lauryl ether sulfate, sodium polyoxyethylene (5) lauryl ether sulfate, sodium polyoxyethylene (3) alkyl(C12,13) ​​ether sulfate, ammonium polyoxyethylene (2) lauryl ether sulfate, and ammonium polyoxyethylene (3) lauryl ether sulfate. The numbers in parentheses above represent the average number of moles (n) of ethylene oxide added. These may be used individually or in combination of two or more.

[0024] The ether carboxylic acid-based surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include sodium polyoxyethylene (3) lauryl ether acetate, potassium polyoxyethylene (4) lauryl ether acetate, and sodium lauryl glycol acetate. The numbers in parentheses above represent the average number of moles (n) of ethylene oxide added. These may be used individually or in combination of two or more.

[0025] There are no particular restrictions on the content of the laurate salt, and it can be set appropriately depending on the purpose, but it is preferably 1% by mass or more and 18% by mass or less, and more preferably 5% by mass or more and 16% by mass or less, based on the total amount of the skin cleansing agent composition. There are no particular restrictions on the content of the myristic acid salt, and it can be set appropriately depending on the purpose, but it is preferably 0.5% by mass or more and 10% by mass or less, and more preferably 1% by mass or more and 6% by mass or less, based on the total amount of the skin cleansing agent composition.

[0026] There are no particular restrictions on the content of the aforementioned higher fatty acid salt, and it can be set appropriately depending on the purpose. However, from the viewpoint of makeup removal effect and low irritation, it is preferable that it be 2% by mass or more and 20% by mass or less, and more preferably 5% by mass or more and 15% by mass or less, based on the total amount of the skin cleansing agent composition. A content of the aforementioned higher fatty acid salt of 2% by mass or more relative to the total amount of the skin cleansing composition is preferable because it can resolve the problem of insufficient makeup removal effect. When the content of the aforementioned higher fatty acid salt is 20% by mass or less relative to the total amount of the skin cleansing agent composition, it is preferable because it can resolve problems such as increased skin irritation.

[0027] The aforementioned higher fatty acid salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available higher fatty acid salts include NIKKOL potassium laurate LK-120 (potassium laurate) and NIKKOL potassium myristate MK-140 (potassium myristate) (both manufactured by Nikko Chemicals Co., Ltd.).

[0028] There are no particular restrictions on the method for synthesizing the aforementioned higher fatty acid salts, and an appropriate method can be selected depending on the purpose. For example, fatty acid salts obtained by conventional methods may be incorporated as is, or higher fatty acid salts may be synthesized during the formulation process of the skin cleansing composition by neutralizing higher fatty acids with an alkali such as potassium hydroxide in a mixing tank. Specifically, potassium laurate may be prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Inc.). Similarly, potassium myristate may be prepared by neutralizing myristic acid (NAA-142, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Inc.).

[0029] As component (A) in the skin cleansing composition of the present invention, it is preferable to use the amino acid-based surfactant and the other anionic surfactant in combination, in that the makeup removal effect and the effect of reducing the amount of inflammatory cytokines are improved.

[0030] <(B) At least one selected from cationic polymers containing dimethyldiallylammonium chloride and cationized polysaccharides> At least one of the cationic polymers containing (B) dimethyldiallylammonium chloride and cationized polysaccharides is included to provide a moist feeling to the skin after use of the skin cleansing composition of the present invention.

[0031] -Cationic polymer containing dimethyldiallylammonium chloride- The cationic polymer is not particularly limited as long as it contains dimethyldiallylammonium chloride, and can be appropriately selected depending on the purpose. It may be a dimethyldiallylammonium chloride polymer or a copolymer of dimethyldiallylammonium chloride and acrylic acid (dimethyldiallylammonium chloride-acrylic acid copolymer), but from the viewpoint of providing a moisturizing effect on the skin, a dimethyldiallylammonium chloride polymer is preferred.

[0032] The dimethyldiallylammonium chloride-acrylic acid copolymer is represented by the following general formula (B1). [ka] In the general formula (B1) above, n and m represent the molar ratio (mol%) of each structural unit. In the above general formula (B1), m is 40 or greater, and n and m satisfy the following formula (I). n+m=100...Formula (I)

[0033] In the present invention, the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is preferably 65 mol% or more, and more preferably 95 mol% or more. By having a molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of 65 mol% or more, a skin cleansing composition with excellent moisturizing properties for the skin can be obtained. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more types.

[0034] The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer in component (B) can be determined by measuring under the following measurement conditions using nuclear magnetic resonance (NMR). [Measurement conditions] Solvent: Deuterium water (D2O) Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

[0035] There are no particular restrictions on the weight-average molecular weight of the cationic polymer, and it can be appropriately selected depending on the purpose, but 10,000 to 1,000,000 is preferred, and 15,000 to 450,000 is more preferred. The weight-average molecular weight of the cationic polymer can be measured, for example, using the SEC-MALLS-RI system (measurement conditions: column: TSKgel α series α-M column 30 cm manufactured by Tosoh Corporation, solvent: 0.3 M aqueous solution of sodium nitrate).

[0036] The viscosity of the 30% to 44% by mass solution of the cationic polymer at 25°C is preferably 10 mPa·s to 15,000 mPa·s, and more preferably 20 mPa·s to 12,000 mPa·s. The viscosity can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0037] The cationic polymer may be one that has been synthesized as appropriate, or a commercially available product may be used. Examples of commercially available cationic polymers include MERQUAT 100 (dimethyldiallylammonium chloride polymer), MERQUAT 280 (dimethyldiallylammonium chloride-acrylic acid copolymer), MERQUAT 295 (dimethyldiallylammonium chloride-acrylic acid copolymer), and MERQUAT 550PR (dimethyldiallylammonium chloride-acrylamide copolymer) (all manufactured by Lubrizol). The composition and physical properties of each commercially available product are shown below. -Marquardt 100- • Composition (molar ratio): Acrylic acid:Dimethyldiallylammonium chloride = 0:100 ·Solid content 39% to 44% by mass Viscosity at 25°C: 8,000 mPa·s to 12,000 mPa·s ·Weight average molecular weight 150,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C, with a rotor of spindle No. 3, and under conditions of 6 revolutions per minute. -Marquardt 280- • Composition (molar ratio): Acrylic acid:Dimethyldiallylammonium chloride = 35:65 ·Solid content 39% by mass ~ 43% by mass Viscosity at 25°C: 3,000 mPa·s to 6,000 mPa·s ·Weight average molecular weight 450,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C, with a rotor of spindle No. 4, and under conditions of 60 revolutions per minute. -Marquardt 295- • Composition (molar ratio): Acrylic acid:Dimethyldiallylammonium chloride = 5:95 ·Solid content 35% to 40% by mass Viscosity at 25°C: 3,500 mPa·s to 9,000 mPa·s ·Weight average molecular weight 190,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C, with a rotor of spindle No. 4, and under conditions of 30 revolutions per minute. -Marquardt 550PR- • Composition (molar ratio): Acrylamide:Dimethyldiallylammonium chloride = 70:30 ·Solid content 8.8% by mass ~ 9.8% by mass Viscosity at 25°C: 75,000 mPa·s to 150,000 mPa·s ·Weight average molecular weight 1,600,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C, using a rotor with spindle No. 4, and at a rate of 10 revolutions per minute.

[0038] -Cationized polysaccharides- The cationized polysaccharide is not particularly limited and can be appropriately selected depending on the purpose. Examples include cationized cellulose and cationized guar gum.

[0039] The aforementioned cationized polysaccharide may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available cationized polysaccharides include Leoguard GP (polyquaternium-10, manufactured by Lion Specialty Chemicals), JAGUAR C145 (cationized guar gum, manufactured by Sankyo Kasei Co., Ltd.), and Laborgum CG-M (DSP Gokyo Food & Chemical Co., Ltd.).

[0040] As component (B), it is preferable to use dimethyldiallylammonium chloride polymer from the viewpoint of improving the moisturizing effect on the skin.

[0041] There are no particular restrictions on the content of component (B) and it can be appropriately selected depending on the purpose, but from the viewpoint of improving the moist feeling of the skin and the absence of skin stiffness, it is preferable that it be 0.2% by mass or more and 1.5% by mass or less, and more preferably 0.3% by mass or more and 0.8% by mass or less, based on the total amount of the skin cleansing agent composition. A content of component (B) of 0.2% by mass or more relative to the total amount of the skin cleansing composition is preferable because it can resolve the problem of insufficient skin moisturizing effect. If the content of component (B) is 1.5% by mass or less relative to the total amount of the skin cleansing agent composition, it is preferable because it can resolve the problem of insufficient dryness of the skin.

[0042] <(C) At least one selected from salicylic acid or a salt thereof, and α-hydroxy acid or a salt thereof> At least one of the above (C) salicylic acid or a salt thereof, and α-hydroxy acid or a salt thereof, is included to enhance the effect of reducing the amount of inflammatory cytokines.

[0043] -Salicylic acid or its salt- The salt in the salicylic acid or its salt is not particularly limited and can be appropriately selected depending on the purpose, for example, alkali metal salts. The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose, for example, sodium salts, potassium salts, etc.

[0044] The salicylic acid or its salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available salicylic acid or its salts include salicylic acid (manufactured by API Corporation).

[0045] -α-hydroxy acid or its salt- The α-hydroxy acid or its salt is not particularly limited and can be appropriately selected depending on the purpose. Examples include malic acid or its salt, glycolic acid or its salt, lactic acid or its salt, tartaric acid or its salt, etc. These can be used individually or in combination of two or more.

[0046] The α-hydroxy acid or its salt is not particularly limited and can be appropriately selected depending on the purpose, for example, alkali metal salts. The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose, for example, sodium salts, potassium salts, etc.

[0047] The α-hydroxy acid or its salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available α-hydroxy acids or their salts include Fuso Malate, DL-Sodium Malate, Fermented Lactic Acid 90, L-Tartaric Acid (all manufactured by Fuso Chemical Industry Co., Ltd.), and Glycolic Acid 50% Cyclosystem Complex (manufactured by H. Holstein Co., Ltd.).

[0048] The content of component (C) is preferably 0.01% to 3% by mass, and more preferably 0.1% to 1% by mass, relative to the total amount of the skin cleansing agent composition, in order to reduce the amount of inflammatory cytokines and improve low irritation. If the content of component (C) is 0.01% by mass or more relative to the total amount of the skin cleansing agent composition, it is preferable that the problem of insufficient reduction of inflammatory cytokine levels is resolved. When the content of component (C) is 3% by mass or less relative to the total amount of the skin cleansing agent composition, it is preferable that problems such as increased skin irritation are resolved.

[0049] <(D) Vitamin C derivative> The aforementioned vitamin C derivative is included to enhance the effect of reducing the amount of inflammatory cytokines.

[0050] There are no particular limitations on the vitamin C derivatives, and they can be appropriately selected depending on the purpose. Examples include sodium ascorbyl phosphate, ascorbyl glucoside, potassium (ascorbyl / tocopheryl) phosphate, magnesium ascorbyl phosphate, sodium ascorbyl-2-phosphate-6-palmitate, ascorbyl dipalmitate, and ascorbyl tetrahexyldecanoate. Among these, sodium ascorbyl phosphate is preferred from the viewpoint of improving the effect of reducing the amount of inflammatory cytokines. These can be used individually or in combination of two or more.

[0051] There are no particular restrictions on the content of component (D) and it can be set appropriately depending on the purpose, but from the viewpoint of reducing the amount of inflammatory cytokines and improving high temperature stability, it is preferable that it be 0.001% by mass or more and 5% by mass or less, and more preferably 0.01% by mass or more and 1% by mass or less, relative to the total amount of the skin cleansing agent composition. If the content of component (D) is 0.001% by mass or more relative to the total amount of the skin cleansing agent composition, it is preferable that the problem of insufficient reduction of inflammatory cytokine levels is resolved. If the content of component (D) is 5% by mass or less relative to the total amount of the skin cleansing agent composition, it is preferable because it can resolve problems such as poor high-temperature stability.

[0052] The aforementioned component (D) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available products of component (D) include ascorbic acid PS (sodium ascorbyl phosphate), Apprecie® (sodium ascorbic acid-2-phosphate-6-palmitate) (both manufactured by Showa Denko Corporation), EPC (SENJU) (potassium ascorbyl / tocopheryl phosphate) (manufactured by Senju Pharmaceutical Co., Ltd.), AA2G (ascorbyl glucoside) (manufactured by Hayashibara Corporation), NIKKOL CP (ascorbyl dipalmitate), NIKKOL VC-PMG (magnesium ascorbyl phosphate), and NIKKOL VC-IPV (ascorbyl tetrahexyldecanoate) (all manufactured by Nikko Chemicals Co., Ltd.).

[0053] <Mass ratio [(A) / (B)]> In the skin cleansing composition of the present invention, there are no particular limitations on the mass ratio [(A) / (B)] of the content of component (A) to the content of component (B), and it can be set appropriately depending on the purpose. However, it is preferably 22 to 40, and more preferably 26 to 32, in order to improve the effect of reducing the amount of inflammatory cytokines. Having a mass ratio of the above-mentioned contents [(A) / (B)] of 22 or more is preferable because it can resolve problems such as insufficient reduction of inflammatory cytokine levels. Having a mass ratio of the above-mentioned contents [(A) / (B)] of 40 or less is preferable because it can resolve problems such as insufficient reduction of inflammatory cytokine levels.

[0054] <Mass ratio [(B) / (C)]> In the skin cleansing composition of the present invention, there are no particular limitations on the mass ratio [(B) / (C)] of the content of component (B) to the content of component (C), and it can be set appropriately depending on the purpose. However, from the viewpoint of improving the effect of reducing the amount of inflammatory cytokines and low irritation, it is preferably 0.3 to 6, and more preferably 0.6 to 1.5. A mass ratio of the above-mentioned content [(B) / (C)] of 0.3 or higher is preferable because it can resolve problems such as insufficient reduction of inflammatory cytokine levels or increased skin irritation. Having a mass ratio of the above-mentioned content [(B) / (C)] of 6 or less is preferable because it can resolve the problem of insufficient reduction in inflammatory cytokine levels.

[0055] <Other ingredients> In addition to component (A), component (B), component (C), and component (D) of the present invention, other components may be added to the skin cleansing composition as needed, provided that they do not impair the effects of the present invention. Examples of the other components mentioned above include surfactants other than component (A), water-soluble solvents, water-soluble polymers other than component (B), oils, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, amino acids, drugs such as vitamins other than component (D), disinfectants, humectants, preservatives, pH adjusters, antioxidants, chelating agents, ultraviolet absorbers, ultraviolet scattering agents, plant and animal extracts or derivatives thereof, chelating agents, dyes, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer compound powders, and the like. These may be used individually or in combination of two or more types. The other components mentioned above may be synthesized as appropriate, or commercially available products may be used. There are no particular restrictions on the content of the other components in the aforementioned skin cleansing composition, and they can be appropriately selected depending on the purpose.

[0056] <<Surfactants other than component (A)>> Other than component (A) mentioned above, there are no particular restrictions on the surfactants, and they can be appropriately selected depending on the purpose. Examples include nonionic surfactants and amphoteric surfactants.

[0057] -Nonionic surfactant- The nonionic surfactant is included to provide a moisturizing effect to the skin after use of the skin cleansing composition and to improve storage stability. The nonionic surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include POE alkyl ether type nonionic surfactants. Examples of the POE alkyl ether type nonionic surfactant include polyoxyethylene (5) behenyl ether, polyoxyethylene (10) behenyl ether, polyoxyethylene (5) octyldodecyl ether, polyoxyethylene (10) octyldodecyl ether, polyoxyethylene (5) decyltetradecyl ether, and polyoxyethylene (20) decyltetradecyl ether. The numbers in parentheses above represent the average number of moles (n) of ethylene oxide added. There are no particular restrictions on the content of the nonionic surfactant, and it can be set appropriately depending on the purpose, but it is preferably 1% by mass or more and 20% by mass or less based on the total amount of the skin cleansing composition.

[0058] - Amphoteric surfactants - The aforementioned amphoteric surfactant is included to reduce the feeling of tightness on the skin after using the skin cleansing composition and to improve storage stability. The aforementioned amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include amide betaine type amphoteric surfactants and alkyl betaine type amphoteric surfactants. The aforementioned amidobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, and palm kernel oil fatty acid amidopropyl betaine. The alkylbetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include lauryldimethylaminoacetic acid betaine, coconut oil alkyl betaine, and stearyldimethylaminoacetic acid betaine. There are no particular restrictions on the content of the amphoteric surfactant, and it can be set appropriately depending on the purpose, but it is preferably 1% by mass or more and 20% by mass or less based on the total amount of the skin cleansing composition.

[0059] <<Water-soluble solvent>> The aforementioned water-soluble solvent is included to provide a moisturizing effect to the skin after use of the skin cleansing composition and to improve storage stability. The aforementioned water-soluble solvent is not particularly limited and can be appropriately selected depending on the purpose. Examples include glycerin, sorbitol, propylene glycol, and 1,3-butylene glycol. There are no particular restrictions on the content of the water-soluble solvent, and it can be set appropriately depending on the purpose, but it is preferably 1% by mass or more and 30% by mass or less based on the total amount of the skin cleansing agent composition.

[0060] <<Oil content>> There are no particular restrictions on the oil content, and it can be appropriately selected depending on the purpose. Examples include vegetable oils and fats such as castor oil, olive oil, cocoa oil, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, and avocado oil, and their ester compounds; animal oils such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. There are no particular restrictions on the oil content, and it can be set appropriately depending on the purpose, but it is preferably 0.1% by mass or more and 10% by mass or less based on the total amount of the skin cleansing agent composition.

[0061] <<Alcoholic beverages>> There are no particular restrictions on the alcohols mentioned above, and they can be appropriately selected depending on the purpose. Examples include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. There are no particular restrictions on the content of the aforementioned alcohols, and they can be set appropriately depending on the purpose, but it is preferable that they be 0.1% by mass or more and 10% by mass or less of the total amount of the skin cleansing agent composition.

[0062] <<Moisturizer>> There are no particular restrictions on the humectant, and it can be appropriately selected depending on the purpose. Examples include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, and polyglycerins. There are no particular restrictions on the amount of the aforementioned moisturizer, and it can be set appropriately depending on the purpose, but it is preferably 0.05% by mass or more and 10% by mass or less based on the total amount of the skin cleansing composition.

[0063] <<Preservatives>> There are no particular restrictions on the preservatives mentioned above, and they can be appropriately selected depending on the purpose. Examples include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4′-trichloro-2′-hydroxydiphenyl ether, 3,4,4′-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone / methylisothiazolinone solution (product name: Kayson CG, manufactured by Rohm & Haas Japan), pentanediol, phenoxyethanol, and ethanol. There are no particular restrictions on the content of the preservative, and it can be set appropriately depending on the purpose, but it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the skin cleansing agent composition.

[0064] <<Antioxidant>> The antioxidant is not particularly limited and can be appropriately selected according to the purpose. For example, dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, etc. can be mentioned. The content of the antioxidant is not particularly limited and can be appropriately set according to the purpose. However, it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the skin cleansing composition.

[0065] <<Chelating agent>> The chelating agent is not particularly limited and can be appropriately selected according to the purpose. For example, disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. can be mentioned. The content of the chelating agent is not particularly limited and can be appropriately set according to the purpose. However, it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the skin cleansing composition.

[0066] <<pH adjuster>> The pH adjuster is not particularly limited and can be appropriately selected according to the purpose. For example, sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, etc. can be mentioned. Among these, potassium hydroxide is preferred.

[0067] <<UV absorber and the above-mentioned UV scattering agent>> The UV absorber and the above-mentioned UV scattering agent are not particularly limited and can be appropriately selected according to the purpose. For example, 2-hydroxy-4-methoxybenzophenone, octyldimethyl para-aminobenzoate, ethylhexyl paramethoxysalicylate, titanium oxide, kaolin, talc, etc. can be mentioned. The content of the UV absorber and the above-mentioned UV scattering agent is not particularly limited and can be appropriately set according to the purpose. However, it is preferably 0.01% by mass or more and 10% by mass or less based on the total amount of the skin cleansing composition.

[0068] <<Vitamins other than component (D)>> Other than the aforementioned component (D), there are no particular restrictions on the vitamins, and they can be appropriately selected depending on the purpose. Examples include vitamin A, B vitamins, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid and its derivatives. There are no particular restrictions on the content of vitamins other than component (D) mentioned above, and they can be set appropriately depending on the purpose, but it is preferable that they be 0.001% by mass or more and 0.5% by mass or less of the total amount of the skin cleansing agent composition.

[0069] <<Amino Acids>> The aforementioned amino acids are not particularly limited and can be appropriately selected depending on the purpose. Examples include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and their derivatives. There are no particular restrictions on the content of the aforementioned amino acids, and they can be set appropriately depending on the purpose, but it is preferable that they be 0.001% by mass or more and 0.5% by mass or less of the total amount of the skin cleansing agent composition.

[0070] <<Water-insoluble polymer compound powder>> The water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose. Examples include nylon and polyethylene. These may be used individually or in combination of two or more. There are no particular restrictions on the content of the water-insoluble polymer compound powder, and it can be set appropriately depending on the purpose, but it is preferably 0.01% by mass or more and 3% by mass or less based on the total amount of the skin cleansing agent composition.

[0071] <ph> The pH of the skin cleansing composition of the present invention is preferably 9 to 11 at 25°C. There are no particular limitations on the method for measuring the pH, but one example is to warm the skin cleansing agent composition to a constant temperature of 25°C and then measure the value after 3 minutes at 25°C using a pH meter (HM-30R, manufactured by TOA DKK).

[0072] <Viscosity> The viscosity of the skin cleansing composition of the present invention at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but 3 mPa·s to 30 mPa·s is preferred. There are no particular restrictions on the method for measuring the viscosity, but one example is to use a BM-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) and measure the viscosity after 1 minute with a sample temperature of 25°C, a rotation speed of 60 rpm, and rotor No. 1. When adjusting the viscosity of the skin cleansing composition of the present invention, it is preferable to use the nonionic surfactant, amphoteric surfactant, and water-soluble solvent described in the <Other Components> section above.

[0073] <Former container> The skin cleansing composition of the present invention may be of the type that is filled into a foaming container and dispensed as a foam. The foaming container is not particularly limited as long as it can dispense the skin cleansing composition in a foamy form, and can be appropriately selected depending on the purpose. Examples include a non-gas foaming dispenser and an aerosol container using a propellant and a pressure-resistant container. Among these, a non-gas foaming dispenser is preferred.

[0074] —Non-gas type foam dispenser— The non-gas foam dispenser is not particularly limited as long as it can dispense the skin cleansing agent composition in a foamed state by mixing it with air, and can be appropriately selected according to the purpose. Examples include a squeeze foamer container that dispenses foam by squeezing the bottle body by hand, and a pump foamer container that dispenses foam by pressing down the nozzle. As the squeeze former container and the pump former container, for example, former containers manufactured by Yamato Seikan Co., Ltd. and former containers manufactured by Yoshino Kogyosho Co., Ltd. can be used. More specifically, former containers described in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, and Japanese Patent Publication No. 2005-193972 can be used.

[0075] The aforementioned non-gas foam dispenser typically has a porous membrane for forming foam, and foam is formed when the skin cleansing agent composition passes through the porous membrane. There are no particular restrictions on the material of the porous membrane, and it can be appropriately selected depending on the purpose, but plastic materials such as nylon, polyester, and polyolefin are preferred.

[0076] There are no particular restrictions on the mesh of the porous membrane, and it can be appropriately selected according to the purpose, but for example, 100 mesh or more is preferred, 100 mesh or more and 400 mesh or less is more preferred, and 200 mesh or more and 350 mesh or less is even more preferred. There are no particular restrictions on the number of porous membranes, and they can be appropriately selected depending on the purpose, but two to four are preferred from the viewpoint of improving foam performance. More specifically, the foaming containers described in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, and Japanese Patent Publication No. 2005-193972 can be suitably used. For example, when using the skin cleansing composition with a pump-former container having one 350-mesh porous membrane and one 200-mesh porous membrane, the viscosity of the skin cleansing composition under the actual temperature conditions is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

[0077] <Method for producing a skin cleansing agent composition> There are no particular limitations on the method for producing the skin cleansing composition of the present invention, and can be appropriately selected depending on the purpose. It can be obtained by mixing component (A), component (B), component (C), and component (D), the other components as needed, and purified water (added as a remainder so that the entire skin cleansing composition is 100% by mass). Specifically, it can be manufactured as follows: After dissolving component (A) and component (C) in purified water heated to 70°C to 80°C, it can be manufactured by cooling it to 40°C or below, and then adding component (B), component (D), and the other components.

[0078] The skin cleansing agent composition may be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected depending on the purpose. Examples include a stirring device equipped with stirring blades that have shear force and can mix the entire mixture. There are no particular restrictions on the stirring blades, and they can be appropriately selected according to the purpose. Examples include propellers, turbines, and dispersers.

[0079] <Application> There are no particular restrictions on the site or method of use of the aforementioned skin cleansing composition; it can be appropriately selected according to the purpose, and for example, it can be used on the whole body, face, hands, etc., in the usual manner. There are no particular restrictions on the use of the aforementioned skin cleansing composition, and it can be appropriately selected according to the purpose. Examples include body shampoo, body soap, facial cleansing foam, hand soap, foaming hand soap, cleansing foam, and makeup remover. Among these, facial cleansing foam is preferred. [Examples]

[0080] The present invention will be described in more detail below based on examples, comparative examples, and formulation examples, but the present invention is not limited to these examples. Furthermore, the content of each component described in the examples, comparative examples, and formulation examples is shown in "mass%" and is all a pure content equivalent.

[0081] (Examples 1-19 and Comparative Examples 1-4) Skin cleansing compositions with the compositions and contents shown in Tables 1 to 5 below were prepared by the following method. Purified water in an amount equivalent to 95% by mass of the total volume of the final skin cleansing agent composition was heated to 70°C to 80°C to dissolve components (A) and (C). After cooling to below 40°C, components (B), (D), and other components were added to prepare the skin cleansing agent composition. Subsequently, if the pH was below the predetermined level, potassium hydroxide, one of the other components, was added to adjust the pH to 10.0, and then purified water was added to bring the total volume to 100% by mass to obtain the target skin cleansing agent compositions of Examples 1 to 19 and Comparative Examples 1 to 4. The mixture was stirred using a Three One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.), with a propeller used as the stirring blade. The skin cleansing compositions obtained from Examples 1 to 19 and Comparative Examples 1 to 4 were filled into containers with foam pump dispensers (discharge volume 1 mL, manufactured by Yoshino Kogyosho Co., Ltd.).

[0082] The skin cleansing compositions obtained from Examples 1-19 and Comparative Examples 1-4 were evaluated and judged for "lack of skin irritation," "skin moisturizing effect," "lack of skin stiffness," "effect of reducing inflammatory cytokine levels," "makeup removal effect," and "high temperature stability." The results are shown in Tables 1-5 below.

[0083] <Evaluation of non-irritation to the skin, skin's moisturizing effect, and lack of skin tightness> Ten expert evaluators used two pumps (approximately 2g) of foam from each of the skin cleansing compositions in Examples 1-19 and Comparative Examples 1-4 to wash their faces for approximately 30 seconds. After rinsing off the foam with water, they patted their faces dry with a towel. They then evaluated the "lack of skin irritation," "skin moisture," and "lack of skin tightness" based on the following evaluation criteria. The average of the ten expert evaluators' ratings was calculated and judged based on the following criteria. -Evaluation criteria for "no skin irritation"- 5 points: No sensation at all. 4 points: No sensation 3 points: Slightly irritating 2 points: I feel a sensation. 1 point: I feel a strong sensation. - Criteria for determining "no skin irritation" - ◎: 4.0 points or higher ○: 3.0 points or higher, less than 4.0 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points -Evaluation criteria for "skin moisture level"- 4 points: Very moisturizing. 3 points: Slightly moisturizing. 2 points: It doesn't feel very moisturizing. 1 point: It doesn't feel moisturizing at all. - Criteria for judging "skin's moisture level" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points -Evaluation criteria for "lack of skin tightness"- 4 points: No creaking at all. 3 points: Slightly creaky 2 points: I feel a creaking sound. 1 point: It creaks a lot. - Criteria for determining "lack of skin tightness" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0084] <Evaluation of the effect of reducing inflammatory cytokine levels> In 10 male and female panelists who used the skin cleansing compositions of Examples 1-19 and Comparative Examples 1-4 for 14 consecutive days, the amount of inflammatory cytokines (interleukin-1α) in the stratum corneum was quantified using ELISA (Enzyme-linked immunosorbent assay) before the start of use of each skin cleansing composition and after the end of use (14 days later). The evaluation was based on the percentage decrease in interleukin-1α before and after the use of each skin cleansing composition, and was determined according to the following criteria. - Criteria for determining the "effect of reducing inflammatory cytokine levels" - ◎: Interleukin-1α levels decreased (decrease rate of 30% or more) ○: Slight decrease in interleukin-1α levels (decrease rate between 20% and 30%) △: Interleukin-1α levels do not change significantly (decrease rate between 10% and 20%) ×: Interleukin-1α levels remain unchanged (decrease rate less than 10%)

[0085] <Evaluation of makeup removal effectiveness> Ten expert evaluators applied a fixed amount (10 mg) of foundation to the inner forearm of each of the ten expert evaluators. They then rubbed the foundation the same number of times (20 back-and-forth strokes) with one pump (approximately 1 g) of foam from each of the skin cleansing compositions in Examples 1-19 and Comparative Examples 1-4. The degree of makeup removal was then visually observed and evaluated based on the following evaluation criteria. The average rating of the ten expert evaluators was calculated and judged based on the following criteria. -Evaluation Criteria for "Makeup Removal Effect"- 4 points: Makeup completely removed 3 points: Makeup was almost completely removed. 2 points: Some makeup remains. 1 point: A lot of makeup remains. - Criteria for determining "makeup removal effectiveness" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0086] <High temperature stability> 50 mL of each of the skin cleansing compositions from Examples 1-19 and Comparative Examples 1-4 was filled into a 55 mL capacity, lidded, hard, transparent glass bottle (8 cm high, 3 cm in diameter). The bottles were stored at 50°C for 4 weeks, and their appearance was observed and evaluated based on the following evaluation criteria. - Evaluation Criteria for "High Temperature Stability" - ◎: Colorless ○: Slightly yellowed △: Yellowed ×: It is quite yellowed.

[0087] [Table 1]

[0088] [Table 2]

[0089] [Table 3]

[0090] [Table 4]

[0091] [Table 5]

[0092] (Prescription examples 1-10) Facial cleansing foams and paste cleansers with the compositions and contents shown in Tables 6-7 below were prepared in the same manner as in Example 1.

[0093] [Table 6]

[0094] [Table 7]

[0095] Details of each component used in Examples 1-19, Comparative Examples 1-4, and Formulation Examples 1-10 are shown in Table 8 below.

[0096] [Table 8] [Industrial applicability]

[0097] The skin cleansing composition of the present invention achieves both effective makeup removal and low irritation, and is excellent in moisturizing the skin, preventing skin dryness, reducing inflammatory cytokine levels, and high-temperature stability. Therefore, it can be suitably used in products such as body shampoos, body soaps, facial cleansers, hand soaps, foaming hand soaps, cleansing foams, and makeup removers.< / ph>

Claims

1. (A) Anionic surfactants including amino acid-based surfactants, (B) At least one selected from cationic polymers containing dimethyldiallylammonium chloride and cationized polysaccharides, (C) At least one selected from salicylic acid or a salt thereof, and α-hydroxy acid or a salt thereof, (D) Vitamin C derivatives, It contains, The content of the amino acid-based surfactant is 1% by mass or more and 10% by mass or less of the total amount of the skin cleansing composition. A skin cleansing composition characterized in that the mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 26 or more and 38.33 or less.

2. The skin cleansing composition according to Claim 1, wherein the mass ratio of the content of component (B) to the content of component (C) [(B) / (C)] is 0.3 or more and 6 or less.

3. The component (B) is at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer, The skin cleansing composition according to any one of claims 1 to 2, wherein the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is 65% or more.

4. A skin cleansing composition according to any one of claims 1 to 3, which is filled into a foaming container.

5. The content of component (B) is 0.3% by mass to 0.8% by mass with respect to the total amount of the skin cleansing composition, The content of component (C) is 0.1% by mass to 1% by mass relative to the total amount of the skin cleansing composition. The skin cleansing composition according to any one of claims 1 to 4, wherein the content of component (D) is 0.01% by mass to 1% by mass relative to the total amount of the skin cleansing composition.

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