Skin cleansing agent composition

Abstract

To provide a skin cleanser composition having excellent foamability, foam thickness (presence feeling) during washing and white foam and capable of obtaining a feeling of increasing of foam (sense of increased foam).SOLUTION: There is provided a skin cleanser composition which is a composition comprising the following components (A) and (B1): (A) an anionic surfactant, (B1) a copolymer having (b1), (b2) and (b3): (b1) a nonionic group-containing vinyl monomer, (b2) a cationic group-containing vinyl monomer and (b3) a crosslinkable vinyl monomer having at least two or more groups selected from a vinyl group, an acryloyl group, a methacryloyl group and an allyl group in the molecule as constitutional units and is filled in a foam discharge container and is discharged as foam from the foam discharge container at a volume ratio of air to the composition (air / composition) of 13 / 1 to 50 / 1.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a skin cleansing composition.

Background Art

[0002] Skin cleansing agents are required to exhibit good foaming properties and favorable foam feel during cleansing. For example, Patent Document 1 describes that a skin or hair cleansing composition containing a surfactant and a cationic polymer has excellent foaming properties and a favorable feeling upon use. Further, skin cleansing agents filled in foam discharge containers have been increasingly developed in recent years, as they eliminate the trouble of whipping foam manually.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] Skin cleansing agents filled in foam discharge containers are used by applying the foam discharged from the container directly to the skin and spreading it, which results in fewer opportunities for air entrainment, making it impossible to obtain sufficient foam thickness during cleansing and making it difficult to achieve a foam-increasing feeling.

Means for Solving the Problem

[0005] The present inventors have found that when a skin cleansing composition containing an anionic surfactant and a specific cationic polymer is discharged as foam from a foam discharge container at a specific volume ratio with air, excellent foaming properties are achieved, the foam has sufficient thickness (presence) during cleansing, the foam is white, and a feeling of increasing foam volume (foam-increasing feeling) can be obtained.

[0006] The present invention provides the following components (A) and (B1): (A) An anionic surfactant, (B1) (b1), (b2) and (b3): (b1) a nonionic group-containing vinyl monomer, (b2) a cationic group-containing vinyl monomer, (b3) a crosslinkable vinyl monomer having at least two or more groups selected from a vinyl group, an acryloyl group, a methacryloyl group and an allyl group in the molecule as constituent units The present invention relates to a skin cleanser composition that is filled in a foam discharge container and discharged as foam from the foam discharge container at a volume ratio of air to the composition (air / composition) of 13 / 1 to 50 / 1. [Effects of the Invention]

[0007] The skin cleanser composition of the present invention has excellent foaming properties, and even when the foam discharged from the foam discharge container is directly applied to the skin and spread for use, the foam has thickness (presence) during cleansing, the foam is white, and a feeling of increasing foam volume can be obtained. In addition, when the foam has fine texture and is firm, the foam during cleansing is perceived as white. [Brief Description of the Drawings]

[0008] [Figure 1] FIG. 3 is a diagram showing the results of measuring the image of foam discharged from the container, the number of foams, and the average diameter of the foams in Test Example 1. [Mode for Carrying Out the Invention]

[0009] The anionic surfactant of component (A) may be any anionic surfactant that is commonly used in ordinary skin cleansers, and examples thereof include polyoxyalkylene alkyl ether carboxylic acids or salts thereof, alkyl sulfuric acids or salts thereof, polyoxyalkylene alkyl ether sulfuric acids or salts thereof, polyoxyalkylene alkenyl ether sulfuric acids or salts thereof, N-acylated amino acids or salts thereof, fatty acids or salts thereof, alkyl sulfosuccinates or salts thereof, polyoxyalkylene alkyl sulfosuccinates or salts thereof, α-olefin sulfonic acids or salts thereof, and N-acylalkyl taurines or salts thereof.

[0010] (A1) Examples of polyoxyalkylene alkyl ether carboxylic acids or salts thereof include polyoxyethylene alkyl ether carboxylic acid salts represented by the following general formula (1). R 1 O(CH2CH2O) m CH2COOM 1 (1) (In the formula, R 1 represents an alkyl or alkenyl group having 4 to 22 carbon atoms, m is the average number of moles added, and represents a number from 0.5 to 15. 1 (This refers to a hydrogen atom, alkali metal, alkaline earth metal, ammonium, or organic ammonium.)

[0011] In general formula (1), R 1 From the viewpoint of foaming properties and formulation stability, alkyl groups having 12 to 16 carbon atoms are preferred, and alkyl groups having 12 to 14 carbon atoms are more preferred. Also, from the above viewpoint, the average number of moles of ethylene oxide added, m, is preferably 1 to 10. M 1 Examples include hydrogen atoms; alkali metals such as sodium and potassium; alkaline earth metals such as calcium and magnesium; ammonium; ammonium derived from alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; and ammonium derived from basic amino acids such as arginine and lysine. Of these, from the above viewpoint, it is preferable to include one or more selected from sodium, potassium, triethanolamine, and arginine, and more preferable to include one or more selected from sodium and potassium.

[0012] As such polyoxyethylene alkyl ether carboxylic acids or salts thereof, specifically, it is preferable to contain one or two or more selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, polyoxyethylene myristyl ether carboxylic acid or a salt thereof, and polyoxyethylene palmityl ether carboxylic acid or a salt thereof, it is more preferable to contain one or two selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, and polyoxyethylene myristyl ether carboxylic acid or a salt thereof, and it is even more preferable to contain polyoxyethylene lauryl ether carboxylic acid or a salt thereof. Examples of these commercially available products include Kao Akypo RLM-45 (manufactured by Kao Corporation), Kao Akypo RLM-45NV (manufactured by Kao Corporation), Kao Akypo RLM 45CA (manufactured by Kao Corporation), Kao Akypo RLM-100 (manufactured by Kao Corporation), Kao Akypo RLM-100NV (manufactured by Kao Corporation), Kao Akypo LM 26C (manufactured by Kao Corporation), and the like.

[0013] (A2) Examples of the alkyl sulfate or polyoxyalkylene alkyl ether sulfate include polyoxyethylene alkyl ether sulfuric acid or a salt thereof represented by the following general formula (2). R 2 O(CH2CH2O) p SO3M 2 (2) (In the formula, R 2 represents an aliphatic hydrocarbon group having 8 to 22 carbon atoms, M 2 represents a cation selected from alkali metals, alkaline earth metals, ammonium, alkylammonium, alkanolammonium, and glucammonium, p represents the average added mole number, and represents a number of 0 to 20)

[0014] In general formula (2), R 2From the viewpoint of improving foam quality and foam retention during washing, aliphatic hydrocarbon groups having 8 to 18 carbon atoms are preferred, aliphatic hydrocarbon groups having 8 to 16 carbon atoms are more preferred, and aliphatic hydrocarbon groups having 10 to 16 carbon atoms are even more preferred. Furthermore, alkyl or alkenyl groups having 8 to 16 carbon atoms are preferred, alkyl or alkenyl groups having 10 to 16 carbon atoms are more preferred, and alkyl or alkenyl groups having 10 to 14 carbon atoms are even more preferred. From the viewpoint of foaming properties, p is preferably 0.5 to 3.0, and more preferably 1.0 to 2.0. M 2 From the viewpoint of improving foam quality and foam retention during washing, alkali metals and ammonium are preferred, and it is even more preferable to include one or two selected from sodium and ammonium.

[0015] Specifically, examples include polyoxyethylene(1-2) alkyl ether sodium sulfate, such as polyoxyethylene(1) lauryl ether sodium sulfate, polyoxyethylene(1) lauryl ether ammonium sulfate, polyoxyethylene(1) myristyl ether sodium sulfate, polyoxyethylene(2) lauryl ether sodium sulfate, and polyoxyethylene(2) myristyl ether sodium sulfate. In this invention, the numbers in parentheses for these compounds represent the average number of moles of ethylene oxide added. Examples of commercially available products include Emal 125HP (manufactured by Kao Corporation, containing sodium polyoxyethylene (1) lauryl ether sulfate), Emal 125A (manufactured by Kao Corporation, containing ammonium polyoxyethylene (1) lauryl ether sulfate), and Emal 227 (manufactured by Kao Corporation, containing sodium polyoxyethylene (2) lauryl ether sulfate).

[0016] (A3) Examples of acylated amino acids or their salts include, for example, the general formula (3)

[0017] [ka]

[0018] (In the formula, R 3 R represents a linear or branched alkyl or alkenyl group having 7 to 21 carbon atoms, 4 R represents a hydrogen atom or an alkyl or alkenyl group having 1 to 4 carbon atoms. 5 is a hydrogen atom or -(CH2) q R 6 (R 6 (where represents a hydrogen atom, a hydroxyl group, or -COOM, and q represents 0-3), M 3 (This represents a hydrogen atom, alkali metal, or alkanolamine.) N-acyl amino acid salts represented by are preferred.

[0019] In formula (3), R 3 As such, alkyl groups having 6 to 18 carbon atoms are preferred, and alkyl groups having 10 to 16 carbon atoms are more preferred. 4 Preferably, the members are a hydrogen atom and an alkyl group having 1 to 4 carbon atoms, and more preferably a hydrogen atom and a methyl group. 5 For example, hydrogen atoms, -(CH2) q R 6 M is preferable. 3 Alkali metals are preferred as such.

[0020] Examples of N-acylamino acid salts represented by general formula (3) include, for example, N-acylglycine salts such as N-cocoyl glycine salt and N-lauroyl-N-methylglycine salt; N-acyl glutamates such as N-cocoyl glutamate, N-lauroyl glutamate, and N-myristoyl glutamate; N-acylalanine salts such as N-lauroyl-β-alanine salt and N-myristoyl-β-alanine salt; N-acyl aspartates such as N-lauroyl aspartate; and N-acylserine salts such as N-lauroyl serine salt. Furthermore, alkali metal salts of these, such as sodium and potassium, and alkanolamine salts such as monoethanolamine, diethanolamine, and triethanolamine are also included. Note that compounds represented by general formula (4) include L-forms, D-forms, and racemic mixtures, and any of these can be used in the present invention. Of these, N-acyl glutamate, N-acyl glycine salt, and N-acyl aspartate are preferred.

[0021] (A4) Examples of fatty acids or salts thereof include fatty acids having 10 to 22 carbon atoms or salts thereof. As fatty acids having 10 to 22 carbon atoms or their salts, from the viewpoint of formulation stability and foaming properties, those containing fatty acids having linear or branched alkyl groups with 10 to 18 carbon atoms are preferred, and those containing fatty acids having linear alkyl groups with 12 to 14 carbon atoms are more preferred. Specifically, examples include one or more selected from laurate, myristicate, palmitate, stearate, and behenate, and from the above viewpoint, one or more selected from laurate, myristicate, and palmitate are more preferred. These salts preferably contain one or more selected from alkali metals and ammonium, more preferably one or more selected from alkali metals, and sodium salts and potassium salts are even more preferred.

[0022] Component (A) preferably contains one or more selected from polyoxyalkylene alkyl ether carboxylic acid or its salt, polyoxyalkylene alkyl ether sulfate or its salt, and N-acylated amino acid or its salt, from the viewpoint of foaming ability, foam quality, and formulation stability.

[0023] The anionic surfactant of component (A) can be used alone or in combination of two or more types. From the viewpoint of improving foam thickness, foam whiteness, foaming sensation, and foaming ability, the content is preferably 4.5% by mass or more, more preferably 5% by mass or more, and even more preferably 6% by mass or more in terms of acid, of the total composition. From the viewpoint of improving foam thickness, it is preferably 10% by mass or less, more preferably 9% by mass or less, and even more preferably 8% by mass or less. Furthermore, the content of component (A) is preferably 4.5 to 10% by mass, more preferably 5 to 9% by mass, and even more preferably 6 to 8% by mass in terms of acid, of the total composition.

[0024] The cationic polymer of component (B1) is (b1) Nonionic group-containing vinyl monomer, (b2) Cationic group-containing vinyl monomer, and (b3) A crosslinkable vinyl monomer having at least two groups selected from vinyl groups, acryloyl groups, methacryloyl groups, and allyl groups in its molecule. It is a copolymer composed of these units. As the cationic polymer of component (B1), (b1) is a nonionic group-containing vinyl monomer represented by general formula (I) or (II). (b2) A cationic group-containing vinyl monomer represented by general formula (III) or (IV), (b3) is a cationic group-containing copolymer obtained by radical polymerization using at least one crosslinkable vinyl monomer having at least two groups selected from vinyl groups, acryloyl groups, methacryloyl groups, and allyl groups in its molecule as a constituent unit.

[0025] [ka]

[0026] [In the formula, R 11 R represents a hydrogen atom or a methyl group. 12 and R 13 These are identical or distinct, representing a hydrogen atom or a linear or branched alkyl or alkenyl group having 1 to 4 carbon atoms.

[0027] [ka]

[0028] [In the formula, R 11 This has the same meaning as above, A 1 and A 2 The groups are identical or distinct and represent the formula -(CH2)m- (where m is an integer from 2 to 6), and B represents the -O- or -CH2- group.

[0029] [ka]

[0030] [In the formula, R 11 This has the same meaning as above, R 14 and R 15 These are identical or different, and represent an alkyl or alkenyl group having 1 to 4 carbon atoms, R 16 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; Y represents an -O-, -NH-, -CH2-, or -O-CH2CH(OH)- group; Z represents a linear or branched alkylene group having 1 to 4 carbon atoms (however, if Y is -CH2-, then 0 to 3 carbon atoms); and X represents a conjugate base of an acid, a halogen atom, or an alkyl sulfate group having 1 to 4 carbon atoms.

[0031] [ka]

[0032] [In the formula, R 17 and R 18 They are the same or different, representing a hydrogen atom or a methyl group, R 19 and R 20 [These are the same or different elements, representing a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and X has the same meaning as above.]

[0033] (b1) Nonionic group-containing vinyl monomer: Specific examples of monomers represented by general formula (I) include (meth)acrylamide, N-methyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, Nn-propyl(meth)acrylamide, N-isopropyl(meth)acrylamide, Nt-butyl(meth)acrylamide, N-isobutyl(meth)acrylamide, and N-hydroxypropyl(meth)acrylamide. Examples of monomers represented by general formula (II) include N-(meth)acroylmorpholine.

[0034] (b2) Cationic group-containing vinyl monomer: Specific examples of monomers represented by the above general formula (III) include dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, dipropylaminoethyl (meth)acrylate, diisopropylaminoethyl (meth)acrylate, dibutylaminoethyl (meth)acrylate, diisobutylaminoethyl (meth)acrylate, di-t-butylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylamide, diethylaminopropyl (meth)acrylamide, dipropylaminopropyl (meth)acrylamide, diisopropylaminopropyl (meth)acrylamide, dibutylaminopropyl (meth)acrylamide, diisobutylaminopropyl (meth)acrylamide, di-t-butylaminopropyl (meth)acrylamide, and other (meth)acrylic acid esters or (meth)acrylamides having a dialkylamino group, which are neutralized by acid or quaternary ammonium salts that have been quaternized with a quaternizing agent.

[0035] Specific examples of monomers represented by the above general formula (IV) include diallyl-type quaternary ammonium salts such as dimethyldiallylammonium chloride and diethyldiallylammonium chloride.

[0036] Preferred acids for obtaining the above acid neutralization products include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, and phosphoric acid; and organic acids with a total of 1 to 22 carbon atoms such as acetic acid, formic acid, maleic acid, fumaric acid, citric acid, tartaric acid, adipic acid, sulfamic acid, toluenesulfonic acid, lactic acid, pyrrolidone-2-carboxylic acid, succinic acid, propionic acid, and glycolic acid. Preferred quaternizing agents for obtaining the above quaternary ammonium salts include alkyl halides with 1 to 8 carbon atoms such as methyl chloride, ethyl chloride, methyl bromide, and methyl iodide, and general alkylating agents such as dimethyl sulfate, diethyl sulfate, and di-n-propyl sulfate.

[0037] Among the monomers represented by the above general formula (III) or (IV), preferred examples include dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylamide, or quaternary ammonium salts obtained by quaternizing diethylaminopropyl (meth)acrylamide with the above-mentioned quaternizing agent, or dimethyldiallylammonium chloride. In this case, acid neutralized monomers may have low viscosity stability because the neutralized acid dissociates depending on the pH of the system, changing the polymer structure. From this point of view as well, quaternary ammonium salt type monomers are more preferred.

[0038] (b3) Crosslinkable vinyl monomer: Examples of crosslinkable vinyl monomers include (meth)acrylic acid esters of polyhydric alcohols such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, 1,2-butylene glycol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, glycerin di(meth)acrylate, glycerin tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, and pentaerythritol tetra(meth)acrylate; and N-methylallyl acrylamide. Examples include acrylamides such as N-vinylacrylamide, N,N'-methylenebis(meth)acrylamide, and bisacrylamideacetic acid; divinyl compounds such as divinylbenzene, divinyl ether, and divinylethyleneurea; polyallyl compounds such as diallyl phthalate, diallyl malate, diallylamine, triallylamine, triallylammonium salt, allyl etherified pentaerythritol, and allyl etherified sucrose having at least two allyl ether units in the molecule; and (meth)acrylic acid esters of unsaturated alcohols such as vinyl (meth)acrylate, allyl (meth)acrylate, 2-hydroxy-3-acryloyloxypropyl (meth)acrylate, and 2-hydroxy-3-acryloyloxypropyl (meth)acrylate. Of these crosslinkable monomers, ethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, divinylbenzene, pentaerythritol trialyl ether, and pentaerythritol tetraallyl ether are preferred.

[0039] (b4) Other vinyl monomers: The copolymer of component (B1) can consist of the three vinyl monomers mentioned above, which are the constituent units, as well as other vinyl monomers that can copolymerize with them. Other vinyl monomers include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, n-pentyl (meth)acrylate, neopentyl (meth)acrylate, cyclopentyl (meth)acrylate, n-hexyl (meth)acrylate, cyclohexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and n-decyl (meth)acrylate. Examples include (meth)acrylic acid derivatives such as phosphate, isodecyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, behenyl (meth)acrylate, phenyl (meth)acrylate, toluyl (meth)acrylate, xylyl (meth)acrylate, benzyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 2-butoxy (meth)acrylate, 2-phenoxy (meth)acrylate, 3-methoxypropyl (meth)acrylate, and 3-ethoxypropyl (meth)acrylate. Other vinyl monomers are preferably used in an amount of 30% by weight or less, and more preferably 15% by weight or less, of the total monomers constituting the copolymer.

[0040] The mixing ratio of the nonionic group-containing vinyl monomer (b1) and the cationic group-containing vinyl monomer (b2), which form a copolymer of component (B1), is preferably 2 / 98 to 98 / 2 in molar ratio (b1) / (b2), and more preferably 40 / 60 to 97 / 3. A larger molar ratio facilitates the expression of thixotropy, while a smaller molar ratio facilitates viscosity retention at low shear rates; however, the above range is preferable for the expression of both properties. The proportion of the crosslinkable vinyl monomer (b3) is preferably 0.002 to 5% by mass relative to the total amount of monomers, and more preferably 0.002% by mass or more and less than 0.1% by mass. If the proportion of monomer (b3) is 0.002% by mass or more, the viscosity of the hydrogel formed from the copolymer of component (B1) is sufficient, and if it is 5% by mass or less, the hydrogel will have a soft and smooth feel.

[0041] A preferred embodiment of the copolymer of component (B1) is the N,N-dimethylaminoethyl methacrylate diethyl sulfate-N,N-dimethylacrylamide-polyethylene glycol dimethacrylate copolymer represented by the following formula:

[0042] [ka]

[0043] (In the equation, the molar ratios are x / y = 1 / 9 to 5 / 5 and (x+y+z) / z = 1 / 0.1 to 1 / 0.002.) Examples of commercially available products include Sofcare KG-301W (manufactured by Kao Corporation) and Sofcare KG-101E (manufactured by Kao Corporation).

[0044] The copolymer of component (B1) can be used in combination of one or more types. From the viewpoint of improving foam thickness, foam whiteness, foaming sensation, and foaming ability, the content is preferably 0.0005% by mass or more, more preferably 0.001% by mass or more, even more preferably 0.005% by mass or more, and even more preferably 0.01% by mass or more in the total composition. From the viewpoint of dischargeability from a foam dispensing container, it is preferably 0.3% by mass or less, more preferably 0.2% by mass or less, even more preferably 0.15% by mass or less, and even more preferably 0.1% by mass or less. Furthermore, the content of component (B1) is preferably 0.0005 to 0.3% by mass in the total composition, more preferably 0.001 to 0.2% by mass, even more preferably 0.005 to 0.15% by mass, and even more preferably 0.01 to 0.1% by mass.

[0045] In the present invention, the mass ratio (A) / (B1) of component (A) to component (B1) is preferably 30 or more, more preferably 60 or more, and even more preferably 300 or more, from the viewpoint of improving foam-increasing properties and foaming properties. From the viewpoint of improving foam thickness, foam whiteness, foam-increasing sensation, and foaming properties, it is preferably 8000 or less, more preferably 2000 or less, and even more preferably 1500 or less. Furthermore, the mass ratio (A) / (B1) of component (A) to component (B1) is preferably 30 to 8000, more preferably 60 to 2000, and even more preferably 300 to 1500.

[0046] The skin cleansing composition of the present invention may further contain a polymer having a cationic group in its molecule (B2) in addition to component (B1), which can further improve foam thickness, foam whiteness, foaming sensation, and foaming ability. Examples of polymers for component (B2) include (B21) cationized cellulose derivatives, (B22) cationized guar gum derivatives, (B23) diallyl quaternary ammonium salt polymers, or diallyl quaternary ammonium / acrylamide copolymers.

[0047] (B21) As a cationized cellulose derivative, one represented by the following general formula (VI) is preferred.

[0048] [ka]

[0049] (In the formula, A represents a residue of an anhydroglucose unit, a is an integer between 50 and 20000, and each R 21 These represent substituents represented by the following general formula (VII).

[0050] [ka]

[0051] (In the formula, R' and R'' are alkylene groups having 2 or 3 carbon atoms, b is an integer from 0 to 10, c is an integer from 0 to 3, d is an integer from 0 to 10, R'''' is an alkylene or hydroxyalkylene group having 1 to 3 carbon atoms, R 22 , R 23 and R 24 X1 may be the same or different, and may represent an alkyl group, aryl group, or aralkyl group having up to 10 carbon atoms, or it may include a nitrogen atom in the formula to form a chlorine ring, and X1 represents an anion (chlorine, bromine, iodine, sulfuric acid, sulfonic acid, methylsulfuric acid, phosphoric acid, nitric acid, etc.).

[0052] The degree of cation substitution of the cationized cellulose derivative is preferably 0.01 to 1, meaning the average value of c per anhydroglucose unit is preferably 0.01 to 1, and more preferably 0.02 to 0.5. Furthermore, the sum of b+d is preferably 1 to 3 on average. For example, R 22 , R 23 and R 24 Preferably, all of the groups are CH3 groups, or two are short-chain alkyl groups such as CH3 groups, and the remaining one is a long-chain alkyl group having 10 to 20 carbon atoms. The molecular weight of the cationized cellulose derivative used here is preferably about 100,000 to 2,000,000, and more preferably 100,000 to 1,000,000. Examples of commercially available products include Poise C-80H (manufactured by Kao Corporation) and Polymer JR-400 (manufactured by Dow Chemical Corporation).

[0053] (B22) The cationized guar gum derivative is preferably one represented by the following general formula (VIII).

[0054] [ka]

[0055] (In the formula, D is a guar gum residue, R 25 is an alkylene group or a hydroxyalkylene group, R 26 , R 27 and R 28X3 may be the same or different, and may represent an alkyl group, aryl group, or aralkyl group having 10 or fewer carbon atoms, or may form a heterocycle including the nitrogen atom in the formula, where X3 is an anion (chlorine, bromine, iodine, sulfuric acid, sulfonic acid, methylsulfuric acid, phosphoric acid, sulfuric acid, etc.), and f is a positive integer.

[0056] The degree of cationic substitution of the cationized guar gum derivative is preferably 0.01 to 1, and more preferably 0.02 to 0.5 cationic groups introduced into the sugar unit. Cationic polymers of this type are described in Japanese Patent Publication No. 58-35640, Japanese Patent Publication No. 60-46158, and Japanese Patent Publication No. 58-53996. Commercially available products include those sold by Rhodia Inc. under the trademark name Jaguar, such as Jaguar C-13C and Jaguar C-17.

[0057] (B23) Diallyl quaternary ammonium salt polymers or diallyl quaternary ammonium salt / acrylamide copolymers are preferably those represented by the following general formula (IX) or (X).

[0058] [ka]

[0059] [ka]

[0060] (In equations (IX) and (X), R 33 and R 34 They are the same or different, and include hydrogen, alkyl groups (1-18 carbon atoms), phenyl groups, aryl groups, hydroxyalkyl groups, amidealkyl groups, cyanoalkyl groups, alkoxyalkyl groups, or carboalkoxyalkyl groups, R 35 , R 36 , R 37 and R 38(These are the same or different atoms, and each is a hydrogen atom, a lower alkyl group (1-3 carbon atoms), or a phenyl group; X4 is an anion (chlorine, bromine, iodine, sulfuric acid, sulfonic acid, methyl sulfate, etc.); g is an integer from 1 to 50; h is an integer from 0 to 50; and i is an integer from 150 to 8000.)

[0061] (B23) Examples of diallyl quaternary ammonium salt polymers or diallyl quaternary ammonium salt / acrylamide copolymers include polyquaternium-22 and polyquaternium-39. The molecular weight of the diallyl quaternary ammonium salt polymer or the diallyl quaternary ammonium salt / acrylamide copolymer is preferably about 30,000 to 2,000,000, and more preferably 100,000 to 1,000,000. Commercially available products include those sold by Matsumoto Kogyo under the trademark name Marcoat, such as Marcoat 100, Marcoat 550, Marcoat 3940, Marcoat 280, and Marcoat 295.

[0062] The polymer of component (B2) preferably has a molecular weight of 30,000 to 2,000,000, and more preferably 100,000 to 1,000,000, from the viewpoint of dischargeability from a foam dispensing container. Furthermore, the polymer of component (B2) preferably has a cation charge density of 0.5 meq / g or more. From the viewpoint of improving foam quality and foam retention during washing, in the case of (B21) cationized cellulose derivatives and (B22) cationized guar gum derivatives, the charge density is preferably 0.5 to 5.0 meq / g, and in the case of (B23) diallyl quaternary ammonium salt polymers or diallyl quaternary ammonium / acrylamide copolymers, the charge density is preferably 2.0 meq / g or more, and more preferably 2.5 to 5.0 meq / g.

[0063] As for component (B2), from the viewpoint of dischargeability from the foam dispensing container and foam quality, a diallyl quaternary ammonium salt polymer or a diallyl quaternary ammonium salt / acrylamide copolymer is preferred.

[0064] The polymer of component (B2) can be used in combination of one or more types. From the viewpoint of improving foam thickness and foam whiteness, the content is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.05% by mass or more in the total composition. From the viewpoint of foam thickness, foaming sensation, and foaming ability, it is preferably 3% by mass or less, more preferably 2% by mass or less, and even more preferably 1.5% by mass or less. Furthermore, the content of component (B2) is preferably 0.005 to 3% by mass in the total composition, more preferably 0.01 to 2% by mass, and even more preferably 0.05 to 1.5% by mass.

[0065] The skin cleansing composition of the present invention may further contain (C) an amphoteric surfactant, which can further improve foam thickness, foam whiteness, foaming sensation, and foaming ability. The amphoteric surfactant of component (C) can be any of those commonly used in skin cleansers, such as betaine-type surfactants such as lauryldimethylaminoacetic acid betaine, amine oxide-type surfactants such as lauryldimethylamine oxide, imidazolinium betaine-type surfactants such as 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, amide betaine-type surfactants such as lauric acid amidopropyl betaine, and sulfobetaine-type surfactants such as lauryl hydroxysulfobetaine. Of these, amide betaine type surfactants are preferred from the viewpoint of improving foam elasticity and foam thickness.

[0066] The amphoteric surfactant of component (C) can be used alone or in combination of two or more types. From the viewpoint of further improving foam thickness, foam whiteness, foaming sensation, and foaming ability, the content is preferably 2.5% by mass or more, more preferably 3% by mass or more, from the viewpoint of foaming sensation and foaming ability, preferably 5% by mass or less, more preferably 4.5% by mass or less, and even more preferably 4% by mass or less. Furthermore, the content of component (C) is preferably 2.5 to 5% by mass, more preferably 3 to 4.5% by mass, and even more preferably 3 to 4% by mass, from the viewpoint of foaming sensation and foaming ability.

[0067] In the present invention, the mass ratio (C) / (A) of component (C) to component (A) is preferably 0.35 or higher, more preferably 0.4 or higher, and even more preferably 0.45 or higher, from the viewpoint of further improving foam thickness and foaming ability. From the viewpoint of further improving foaming ability, it is preferably 0.8 or lower, more preferably 0.7 or lower, and even more preferably 0.6 or lower. Furthermore, the mass ratio (C) / (A) of component (C) to component (A) is preferably 0.35 to 0.8, more preferably 0.4 to 0.7, and even more preferably 0.45 to 0.6.

[0068] In the present invention, the mass ratio (C) / (B1) of component (C) to component (B1) is preferably 15 or more, more preferably 20 or more, and even more preferably 30 or more, from the viewpoint of dischargeability from a foam dispensing container and foaming ability. From the viewpoint of further improving foaming ability, it is preferably 3600 or less, more preferably 1000 or less, and even more preferably 500 or less. Furthermore, the mass ratio (C) / (B1) of component (C) to component (B1) is preferably between 15 and 3600, more preferably 20 and 1000, and even more preferably 30 and 500.

[0069] The skin cleansing composition of the present invention may further contain (D) a polyhydric alcohol, which can further improve foam thickness, foam whiteness, foam-enhancing properties, and foaming ability. Examples of polyhydric alcohols include those commonly used in skin cleansers, such as dihydric alcohols like ethylene glycol, diethylene glycol, hexylene glycol, propylene glycol, 1,3-propanediol, dipropylene glycol, polypropylene glycol, isoprene glycol, and 1,3-butylene glycol; trihydric or higher alcohols like glycerin, diglycerin, triglycerin, tetraglycerin, hexaglycerin, decaglycerin, and trimethylpropanol; and sugars or sugar alcohols such as erythritol, pentaerythritol, dipentaerythritol, glucose, mannose, galactose, sucrose, fructose, maltose, maltitol, xylitol, inositol, sorbitan, and sorbitol. Of these, glycerin, propylene glycol, and dipropylene glycol are preferred from the viewpoint of further improving foam thickness, foam whiteness, foaming effect, and foaming ability.

[0070] The polyhydric alcohol of component (D) can be used by one or a combination of two or more types. From the viewpoint of further improving foam thickness, foam whiteness, foaming sensation, and foaming ability, the content is preferably 2% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, preferably 40% by mass or less, more preferably 35% by mass or less, and even more preferably 30% by mass or less. Furthermore, the polyhydric alcohol content is preferably 2 to 40% by mass of the total composition, more preferably 10 to 35% by mass, and even more preferably 20 to 30% by mass.

[0071] The skin cleansing composition of the present invention is preferably in the form of a liquid obtained by dissolving the above components in water. The water content is the remainder of the above components (A) to (D) and other components to be included as needed, and from the viewpoint of low-temperature stability and dischargeability, it is preferably 40% by mass or more, more preferably 45% by mass or more, even more preferably 50% by mass or more, preferably 75% by mass or less, more preferably 70% by mass or less, and even more preferably 65% ​​by mass or less. Furthermore, the water content is preferably 40 to 75% by mass, more preferably 45 to 70% by mass, and even more preferably 50 to 65% by mass of the total composition.

[0072] In addition to the components mentioned above, the skin cleansing composition of the present invention may use components commonly used in ordinary cleansing compositions, as long as they do not impair the effects of the present invention. Examples include surfactants other than those mentioned above; lower alcohols such as ethanol and isopropyl alcohol; aromatic alcohols such as benzyl alcohol and benzyloxyethanol; cellosolves such as ethyl cellosolve and butyl cellosolve; carbitols such as ethyl carbitol and butyl carbitol; moisturizing ingredients such as sugars (derivatives), amino acids (derivatives), plant and animal (protein) derivatives, and plant and animal extracts; silicone derivatives such as polyoxyalkylene-modified silicones; inorganic or organic salts such as sodium sulfate, sodium carbonate, sodium bicarbonate, potassium chloride, sodium chloride, and sodium citrate; pH adjusters such as acids and alkalis; anti-inflammatory agents such as glycyrrhetinic acid, glycyrrhizic acid and their derivatives; bactericidal agents such as isopropylmethylphenol; preservatives, metal ion chelating agents, antioxidants, ultraviolet absorbers, anionic polymers, nonionic polymers, amphoteric polymers, fragrances, thickeners, vitamins, natural pigments, tar dyes, and other colorants.

[0073] The pH of the skin cleansing composition of the present invention is preferably in the range of pH 4.5 to 6.9, and more preferably in the range of pH 4.8 to 6.4, from the viewpoint of providing sufficient mildness after washing. In this invention, pH is measured by filling a beaker with 100 mL of the liquid detergent composition (undiluted solution), adjusting the temperature to 30°C in a 30°C constant temperature bath, and then immersing a pH measuring electrode in the solution for 1 minute.

[0074] The skin cleansing composition of the present invention is in liquid form, and from the viewpoint of ensuring a good foam appearance and dispensing performance, its viscosity at 30°C is preferably 2 to 20 mPa·s, more preferably 3 to 16 mPa·s, and even more preferably 6 to 13 mPa·s. In this invention, viscosity is measured at 30°C using a Brookfield viscometer (Toki Sangyo, TVB-10), with rotor No. 1 and rotation speed of 60 r / min, 60 seconds after the start of rotation.

[0075] The skin cleansing composition of the present invention is filled into a foaming container (foamer container) and dispensed from the foaming container as foam in a volume ratio of air to composition (air / composition) of 13 / 1 to 50 / 1. The skin cleansing composition is a foaming composition, and by being dispensed from the foaming container in the above volume ratio, a foam composition is produced with improved foam thickness, foam whiteness, foaming sensation, and foaming ability. The skin cleansing composition, together with the foaming container, can constitute a skin cleansing article. The volume ratio of air to composition (air / composition) when discharged from the foam dispensing container is preferably 15 / 1 to 50 / 1, more preferably 15 / 1 to 45 / 1, and even more preferably 20 / 1 to 40 / 1, from the viewpoint of further improving foam thickness, foam whiteness, and foaming ability. Particularly from the viewpoint of further improving foaming ability, it is preferably 25 / 1 or more, more preferably 27 / 1 or more. From the viewpoint of further improving the feeling of increased foaming, it is preferably 15 / 1 to 40 / 1, more preferably 15 / 1 to 35 / 1, and even more preferably 17 / 1 to 30 / 1.

[0076] The foam dispensing container (X) used in the present invention is, for example, a container having a foaming mechanism and a discharge port, and is a normal pressure container that does not require a propellant such as compressed gas. The composition is stored in a container, and the foaming mechanism may have a gas-liquid mixing section and a foam atomizing section, generate foam from the liquid, and discharge the foam from a discharge port. The gas-liquid mixing section is the region where air transported from outside or inside the foam dispensing container (X) flows in and mixes with the liquid skin cleansing agent composition (Y), which is stored inside the main body or in a tank or other component and filled into the container (X) as its contents. The foam atomization section is a region or component that atomizes the foam produced by mixing the air and the skin cleansing agent composition (Y) by providing a flow path or porous component with a specific shape in the flow path leading to the discharge port. The discharge port is a component that discharges the foam, which is generated by mixing the air and the skin cleansing agent composition (Y) and atomized by the foam atomization section, to the outside.

[0077] In other words, the gas-liquid mixing section, foam atomization section, and discharge port of these foam dispensing containers (X) are directly or indirectly linked in this order via components such as tubes and nozzles as needed. Then, in response to the added manual or electric power, the skin cleansing agent composition (Y), which is filled as a liquid inside the body of the foam dispensing container (X) or a tank or other component, passes from the gas-liquid mixing section to the foam atomization section, and then from the foam atomization section to the discharge port, and the skin cleansing agent composition (Y), which has become a fine foam containing air, is discharged to the outside from the discharge port and can be applied to the skin.

[0078] In the foam dispensing container (X) used in the present invention, from the viewpoint of dispensing foam at a high foaming ratio while ensuring good foam quality, the volume ratio of air to skin cleansing agent composition (Y) (air / composition) in the mechanism for dispensing contents from the outlet of the container (X) is 13 / 1 or more, preferably 15 / 1 or more, more preferably 17 / 1 or more, and even more preferably 20 / 1 or more. Furthermore, from the viewpoint of ease of operation of the container, reducing the weight and size of the container, and ensuring good foam quality, the volume ratio of air to skin cleansing agent composition (Y) (air / composition) is 50 / 1 or less, preferably 40 / 1 or less, more preferably 38 / 1 or less, even more preferably 30 / 1 or less, even more preferably 29 / 1 or less, and even more preferably 26 / 1 or less. Furthermore, in the mechanism for discharging the contents from the outlet of the foam discharging container (X), the volume ratio of air to the skin cleansing agent composition (Y) (air / composition) is 13 / 1 to 50 / 1, preferably 15 / 1 to 40 / 1, more preferably 17 / 1 to 38 / 1, even more preferably 20 / 1 to 30 / 1, even more preferably 20 / 1 to 29 / 1, and even more preferably 20 / 1 to 26 / 1. Note that the volume ratio of air to skin cleansing agent composition (Y) (air / composition) refers to the value at 25°C. A mechanism for discharging contents from a discharge port in the above volume ratio (air / composition) of air and skin cleansing agent composition may include, for example, a gas-liquid mixing section in which air and skin cleansing agent composition (Y) can be mixed in the above volume ratio (air / composition).

[0079] The specific form of the foam dispensing container (X) is one in which air and the skin cleansing agent composition are discharged from the gas-liquid mixing section in the above-mentioned mass ratio, preferably via a foam atomization section, and then the contents are discharged to the outside from the discharge port, and examples include squeeze-type containers, manual pump-type containers, and electric pump-type containers.

[0080] A squeeze-type container, also known as a squeeze container, is a container whose body is deformable. By applying manual external pressure to the body, that is, by squeezing and deforming the body, air pressurized from within the headspace is mixed with the liquid contents in a gas-liquid mixing section to form bubbles. These bubbles are then further refined in a bubble-refining section and discharged from a discharge port. Specifically, examples include the container described in Japanese Patent Publication No. 7-215353.

[0081] A pump-type container, also known as a pump vessel, is a foam dispenser equipped with a pump head that, when pressed, mixes air pumped from inside or outside the container with the liquid contents in a gas-liquid mixing section to form foam, then further refines the foam in a foam refinement section, and finally discharges the foam from the outlet. In other words, such a pump-type container is equipped with an air cylinder for introducing air from inside or outside the container and a liquid cylinder that serves as a flow path for the liquid contents, and each cylinder has a mechanism in which a piston slides. These pistons are driven by the pressure of the pump head, sending air and the liquid contents to the gas-liquid mixing section where they are mixed, then forming foam in the foam refinement section, and finally discharging the foam from the outlet. These containers are broadly classified into so-called manual pump-type containers, where the pump head is pressed manually, and so-called electric pump-type containers, where the pump head is pressed and the air and contents are transported between components electrically; both types can be used. Specifically, examples include the manual pump type container described in Japanese Patent Publication No. 2009-202122, and the electric pump type container described in Japanese Patent Publication No. 2006-212086 and Japanese Patent Publication No. 2013-212244.

[0082] Among these specific forms of foam dispensing containers (X), manual pump type containers and electric pump type containers are preferred from the viewpoint of stably ensuring a high foaming ratio, ensuring the formation of high-quality foam, and ease of operation of the container.

[0083] Furthermore, the foam dispensing container (X) used in the present invention preferably includes a porous member with a mesh or multiple small holes in the foam micronization section, from the viewpoint of forming a good foamy composition as the contents pass through the dispensing port, and from the viewpoint of the formed foam having good foam quality and improving the user experience. The mesh opening is preferably 16 to 180 μm (#510 to #90), and more preferably 40 to 80 μm (#330 to #180) considering the ease of use of the container and the quality of the foam obtained.

[0084] The skin cleansing composition of the present invention is used for skin cleansing and is suitably used as a hand soap, facial cleanser, and body soap. The skin cleansing composition of the present invention can be used to cleanse the skin by general skin cleansing methods. For example, it can be used by taking foam dispensed from a foam dispenser into the hand, applying it directly to the skin without diluting it with water, lathering and washing, and then rinsing with warm water such as a shower. Furthermore, there are several cleaning methods, including washing by hand and using cleaning tools such as sponges, towels, and scrubbing brushes made of synthetic fibers like cotton or nylon. From the perspective of reducing skin irritation, washing by hand is preferable. [Examples]

[0085] Examples 1-32, Comparative Examples 1-2 Skin cleansing compositions with the compositions shown in Tables 1 to 3 were prepared. The obtained skin cleansing compositions were tested by dispensing foam from a foam dispensing container. The thickness (presence) of the foam during washing, the whiteness of the foam, the feeling of the foam increasing, the foaming ability, and the pressure applied by the foam dispensing container were evaluated. The results are shown in Tables 1 to 3. Furthermore, non-aerosol type foam dispensing containers (containers described in Japanese Patent Publication No. 2019-107644) with different volume ratios (air / composition) in the gas-liquid mixing section were used as foam dispensing containers. The foam dispensing container is equipped with three meshes (#90 / mesh opening 177 μm, #200 / mesh opening 77 μm, #305 / mesh opening 44 μm) in the foam micronization section. The foaming mechanism is pump-type; when the head is pressed down, the piston is driven in conjunction with it, and as the piston moves within the cylinder, air and composition are supplied to the gas-liquid mixing section. The ambient temperature was set to 25°C, and each skin cleansing agent composition was filled into the foam dispensing container. With a single push of the head unit, 1 mL of the composition is dispensed from a liquid cylinder at a discharge speed of 30 mm / s, and a predetermined volume ratio of air is dispensed from an air cylinder at a discharge speed of 30 mm / s into the gas-liquid mixing chamber. The mixture is then mixed to form bubbles, which are then atomized through a bubble atomization section and discharged from the outlet by driving the piston.

[0086] (Manufacturing method) Each component was mixed with water, dissolved, and the pH was adjusted to 6.2 with citric acid to produce a skin cleansing agent composition. The resulting skin cleansing agent composition was then filled into a foam dispensing container.

[0087] (Evaluation method) (1) Thickness of bubbles (presence): Three expert panelists wet their forearms with water, dispensed 1 mL of foam onto the palm of one hand, and massaged it onto the other forearm 20 times. They evaluated the perceived thickness (presence) of the foam according to the following criteria. The results are shown as the average score of the three panelists. 5 points: It's quite thick. 4 points: It's thick. 3 points: It's a bit thick. 2 points: It's a little thin. 1 point: It's not thick enough.

[0088] (2) Whiteness of the foam: Three expert panelists wet their forearms with water, dispensed 1 mL of foam onto the palm of one hand, and massaged it onto the other forearm 20 times. They then evaluated the whiteness of the foam according to the following criteria. The results are shown as the average score of the three panelists. 5 points: I find the foam to be quite white. 4 points: The foam appears white. 3 points: The foam appears slightly white. 2 points: I don't find the foam to be particularly white. 1 point: I don't perceive the foam as white.

[0089] (3) The feeling of the bubbles increasing: Three expert panelists wet their forearms with water, dispensed 1 mL of foam onto the palm of one hand, and then spread it onto the other forearm. They evaluated whether the amount of foam increased in proportion to the number of times they rubbed the forearms together, according to the following criteria. The results are shown as the average score of the three panelists. 5 points: I feel like the foam increases considerably. 4 points: I feel like the bubbles are increasing. 3 points: I feel like the foam is increasing slightly. 2 points: I feel that the foam doesn't increase as much as I'd like. 1 point: I feel like the foam doesn't increase.

[0090] (4) Foaming property: Three expert panelists wet their forearms with water, dispensed 1 mL of foam into the palm of one hand, and massaged it 20 times against the other forearm. They then collected all the foam, placed it in a beaker, and measured the volume of foam using a cone-shaped liquid meter (Kartell).

[0091] (5) Pressing pressure of the foam dispensing container: For each skin cleansing agent composition, the head was pressed down at a constant speed, and the pressing force was measured using a load cell (manufactured by Unipulse). Three measurements were taken for each composition, and the average value was calculated.

[0092] [Table 1]

[0093] [Table 2]

[0094] [Table 3]

[0095] Test Example 1 For the skin cleansing compositions of Examples 1, 4, 18, 20, and Comparative Example 1, images of the foam dispensed from a foam dispensing container were taken, and the number of bubbles and the average diameter of the bubbles were measured. The results are shown in Figure 1.

[0096] (Evaluation Method) Three expert panelists wet their forearms with water, dispensed 1 mL of foam into the palm of one hand, and pressed it against the other forearm, massaging it 20 times. After that, all the foam was collected. The foam was placed in a glass cylinder with a prism, and images of the foam were taken using a dynamic foam analyzer (DFA100-FSM, manufactured by KRAUSS GmbH, Germany). The number of bubbles and the average diameter of the bubbles were then determined.

[0097] As shown in Figure 1, the foam compositions generated from the skin cleansing compositions of the examples all had a small average foam diameter, a large number of foams, and appeared white.

[0098] Prescription Examples 1-4 When a skin cleansing agent composition with the composition shown in Table 4 is filled into a foam dispensing container (for example, the same as in the examples) and the foam is dispensed from the container to cleanse the skin, it exhibits excellent foaming properties, has a substantial foam thickness (presence), is white, and gives the impression of increasing foam volume.

[0099] [Table 4]

Claims

1. The following components (A) and (B1): (A) Anionic surfactant, (B1)(b1), (b2) and (b3): (b1) Nonionic group-containing vinyl monomer, (b2) Cationic group-containing vinyl monomer, (b3) A crosslinkable vinyl monomer having at least two groups selected from vinyl groups, acryloyl groups, methacryloyl groups, and allyl groups in its molecule. Copolymer comprising the above as a constituent unit: 0.0005% by mass or more and 0.1% by mass or less A skin cleansing article comprising a skin cleansing composition (Y) containing a foam dispensing container (X), The foam dispensing container (X) comprises a foaming mechanism having a gas-liquid mixing section and a discharge port. The foam dispensing container (X) has a gas-liquid mixing section capable of mixing air and a skin cleansing agent composition (Y) so that air and a skin cleansing agent composition (Y) are dispensed as foam from the outlet in a volume ratio (air / composition) of 13 / 1 to 50 / 1. A skin cleansing article comprising the above component (B1) containing N,N-dimethylaminoethyl methacrylate diethyl sulfate-N,N-dimethylacrylamide-polyethylene glycol dimethacrylate copolymer.

2. The skin cleansing article according to claim 1, wherein component (A) comprises (A2) alkyl sulfate or polyoxyalkylene alkyl ether sulfate.

3. The aforementioned component (A) is as follows (A1) to (A4): (A1) Polyoxyalkylene alkyl ether carboxylic acid (A2) Alkyl sulfate or polyoxyalkylene alkyl ether sulfate (A3) Acylated amino acids or their salts (A4) Fatty acids or their salts A skin cleansing article according to claim 1, comprising two or more different anionic surfactants selected from the group consisting of the following.

4. A skin cleansing article according to any one of claims 1 to 3, wherein the content of component (B1) is 0.001 to 0.1% by mass.

5. A skin cleansing article according to any one of claims 1 to 3, wherein the content of component (A) is 5.5 to 10% by mass in terms of acid.

6. A skin cleansing article according to any one of claims 1 to 3, wherein the content of component (A) is 6 to 8.3% by mass in terms of acid.

7. Furthermore, the skin cleansing article according to any one of claims 1 to 3, further comprising (C) 2.5 to 5% by mass of an amphoteric surfactant.

8. The skin cleansing article according to claim 7, wherein the mass ratio (C) / (A) of component (C) to component (A) is 0.35 to 0.

8.

9. A skin cleansing article according to any one of claims 1 to 3, wherein the mass ratio (A) / (B1) of component (A) to component (B1) is 30 to 8000.

10. Furthermore, the skin cleansing article according to any one of claims 1 to 3, further comprising (B2) a polymer having a cationic group in its molecule other than component (B1).

11. The skin cleansing article according to claim 10, wherein component (B2) has a molecular weight of 30,000 to 2,000,000.

12. The skin cleansing article according to claim 10, wherein the content of component (B2) is 0.005 to 3% by mass.

13. Furthermore, (D) a skin cleansing article according to any one of claims 1 to 3, comprising a polyhydric alcohol.

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