Detergent composition for skin

Abstract

The present invention provides a cleansing agent composition for skin, which stably contains a clay mineral in a preparation mainly composed of an acylamino acid surfactant. This skin cleanser composition contains the following components (A)-(D): (A) 5-40% by mass of an acylamino acid surfactant; (B) 25 to 60 mass% of glycerol; (C) 0.05-10% by mass or less of a clay mineral; (D) 15-45% by mass of water; the composition contains (b1) diglycerol and (b2) monoglycerol and / or polyglycerol other than (b1) as component (B) glycerol.

Description

Technical Field

[0001] The present invention relates to a skin cleanser composition. Background Art

[0002] In recent years, the functions required of skin cleansing compositions include the ability to cleanse and suppress sebum.

[0003] On the other hand, conventional skin cleansing compositions based on acylamino acid surfactants, which are the most common, are mild, but their skin cleansing and sebum-control effects are relatively poor for oily skin with excess sebum. Furthermore, formulations based on acylamino acid surfactants have the tendency to crystallize over time, forming recognizable particles, making it difficult to maintain product stability. Furthermore, when new ingredients with potential additional functions are added to products based on acylamino acid surfactants, the increased likelihood of promoting the growth of acylamino acid surfactant crystals can further deteriorate product stability.

[0004] Furthermore, while clay minerals possess multiple functions, including sebum adsorption and acne bacteria inhibition, they are less irritating to the skin than typical surfactants and are therefore commonly incorporated into skin cleansing compositions. Therefore, by incorporating clay minerals into skin cleansing compositions containing acylamino acid surfactants, there is a desire to develop mild and multifunctional amino acid-based skin cleansing compositions that possess not only sebum cleansing properties but also superior performance.

[0005] However, because clay minerals are powders, they are prone to precipitation, potentially degrading product stability and significantly impairing product quality. Furthermore, amino acid surfactants are known to be difficult to handle and are prone to crystal growth during storage, leading to quality degradation. This can further deteriorate product quality when blended with clay minerals.

[0006] Therefore, there is a need to develop a technology that can suppress the precipitation of clay minerals and the crystal growth of acylamino acid surfactants. Summary of the Invention

[0007] Therefore, an object of the present invention is to provide a highly stable skin cleanser composition which, despite containing two components, namely, an acylamino acid surfactant and a clay mineral, can suppress the precipitation of the clay mineral and the crystal growth of the acylamino acid surfactant.

[0008] The present inventors have conducted extensive research to develop a composition comprising both an acylamino acid surfactant and a clay mineral from the perspective of improving stability. As a result, they have discovered that by combining a specific glycerin component with a formulation comprising both an acylamino acid surfactant and a clay mineral, a skin cleanser composition can be obtained that, while blending the clay mineral, inhibits the growth of crystals of the acylamino acid surfactant and also inhibits the precipitation of the clay mineral.

[0009] That is, the present invention provides a skin cleanser composition comprising the following components (A) to (D):

[0010] (A) acylamino acid surfactant: 5-40% by mass;

[0011] (B) Glycerol: 25-60% by mass;

[0012] (C) Clay minerals: 0.05 to 10% by mass;

[0013] (D) Water: 15-45% by mass

[0014] Furthermore, (b1) diglycerol, (b2) monoglycerol, and / or polyglycerol other than (b1) are contained as the component (B) glycerols.

[0015] Effects of the Invention

[0016] According to the present invention, the inclusion of an acylamino acid surfactant not only achieves a sebum cleansing function but also reduces skin irritation. Furthermore, the inclusion of a clay mineral enables multiple functions such as sebum adsorption and acne-inhibiting functions. Furthermore, the inclusion of diglycerin inhibits the crystal growth of the acylamino acid surfactant even when formulated with a clay mineral, further suppressing the precipitation of the clay mineral. DETAILED DESCRIPTION

[0017] Hereinafter, the present invention will be described in detail.

[0018] [Ingredients (A)]

[0019] The skin cleanser composition of the present invention contains (A) an acylamino acid surfactant. The inclusion of this (A) acylamino acid surfactant allows for maintaining excellent foaming properties and achieving a smooth, creamy foam that adheres well to the skin. The (A) acylamino acid surfactant is preferably an N-acylamino acid or a salt thereof. These N-acylamino acids or salts may be used alone or in combination of two or more.

[0020] From the perspective of foaming properties and post-cleansing skin feel, the acyl group in the acylamino acid surfactant (A) has 8 to 18 carbon atoms, preferably 8 to 16 carbon atoms, and more preferably 12 to 16 carbon atoms. The acyl group is preferably derived from a saturated or unsaturated linear or branched fatty acid or a mixed fatty acid. Examples of such fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid; or mixed fatty acids such as coconut oil fatty acid and palm kernel oil fatty acid. Among these fatty acids, from the perspective of foaming properties, foam quality, and storage stability, lauric acid, myristic acid, palmitic acid, oleic acid, coconut oil fatty acid, and palm kernel oil fatty acid are preferred. Lauric acid, myristic acid, coconut oil fatty acid, and palm kernel oil fatty acid are more preferred, and coconut oil fatty acid is even more preferred.

[0021] Examples of the amino acid residue in the acylamino acid surfactant (A) include residues derived from at least one amino acid selected from glutamic acid, aspartic acid, glycine, and alanine. Among these amino acid residues, at least one amino acid residue derived from glycine and alanine is preferred from the perspectives of foaming properties, foam quality, and storage stability. It is particularly preferred that the acylamino acid surfactant (A) contain both (a1) N-acylglycinate and (a2) N-acylalanine.

[0022] When the acylamino acid surfactant (A) contains both (a1) N-acylglycine salt and (a2) N-acylalanine salt, the mass ratio (a1) / (a2) of the content of (a1) N-acylglycine salt to the content of (a2) N-acylalanine salt is preferably 1 to 15, more preferably 2 to 12, and even more preferably 5 to 8 from the viewpoint of crystal stability.

[0023] For (A) acylamino acid surfactants, when deployed as N-acylamino acids, in order to ensure foaming or foam quality, they are neutralized to the desired pH value by alkali for use. As alkali, conventional alkalis such as sodium hydroxide, potassium hydroxide, monoethanolamine, triethanolamine, diethanolamine, ammonia, lysine, arginine, histidine, sodium acetate, potassium acetate, AMP (2-amino-2-methyl-1-propanol), 2-amino-2-hydroxymethyl-1,3-propanediol can be used, preferably sodium hydroxide, potassium hydroxide, arginine. Among them, from the perspective of foaming or foam quality, skin irritation or ease of acquisition, it is preferred to use sodium hydroxide, potassium hydroxide, arginine as a base to modulate to form a sodium salt, potassium salt, or arginine salt, and it is further preferred to use sodium hydroxide or potassium hydroxide as a base to modulate to form a sodium salt or potassium salt. On the other hand, it is also possible to deploy a salt in which all or part of the carboxyl groups possessed by the (A) acylamino acid surfactant are pre-neutralized by an alkali. The salt obtained by neutralization is preferably a salt selected from sodium salts, potassium salts, ammonium salts, ethanolamine salts, and basic amino acid (lysine, arginine, histidine) salts from the viewpoints of foaming properties or foam quality, skin irritation, or easy availability. Salts selected from sodium salts, potassium salts, and arginine salts are more preferred, and sodium salts and potassium salts are particularly preferred. In addition, in order to ultimately achieve the desired pH value of the skin cleanser composition, various conventional bases such as sodium hydroxide, potassium hydroxide, triethylamine, ammonia, lysine, arginine, and histidine may be added as needed. In any case, in order to adjust the pH value of the skin cleanser composition, various conventional acids such as hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, citric acid, malic acid, lactic acid, fumaric acid, and succinic acid may be added.

[0024] The content of the acylamino acid surfactant (A) in the skin cleansing composition of the present invention is preferably 5% by mass or more, more preferably 17% by mass or more, and even more preferably 20% by mass or more, and is preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, and particularly preferably 23% by mass or less, from the viewpoint of suppressing crystal growth of the acylamino acid surfactant component (A) and suppressing precipitation of the clay mineral (C), thereby achieving high stability of the skin cleansing composition.

[0025] [Component (B)]

[0026] The skin cleansing composition of the present invention contains glycerin as a component (B).

[0027] Examples of the glycerols as the component (B) in the present invention include monoglycerol, diglycerol, and polyglycerol.

[0028] The skin cleanser composition of the present invention preferably contains both (b1) diglycerol and (b2) monoglycerol and / or a polyglycerol other than (b1) as the glycerin component (B) from the viewpoint of suppressing the crystal growth of the acylamino acid surfactant component (A) and suppressing the precipitation of the clay mineral (C), thereby achieving high stability of the skin cleanser composition.

[0029] In the present invention, "(b2) monoglycerol and / or polyglycerol other than (b1)" means that diglycerol (b1) is not included. That is, component (b2) in the present invention includes "monoglycerol" and / or "polyglycerol other than diglycerol." From the perspective of achieving high stability of the skin cleanser composition, in the present invention, monoglycerol is preferably included as component (b2).

[0030] The "polyglycerol" in the present invention refers to polyglycerol other than diglycerol, and examples thereof include the compound represented by the following formula (1).

[0031]

[0032] In formula (1), [C3H6O2] represents a glycerol unit, and k represents the average degree of polymerization of [C3H6O2], wherein k is a number from 3 to 10. Regarding the polyglycerol in the present invention, the total content of triglycerol and tetraglycerol may be 75% by mass or greater. Here, the average degree of polymerization k refers to a value measured by the following method and calculated by the following calculation formula (2).

[0033] <Method for measuring the average degree of polymerization (k) of polyglycerol>

[0034] The average degree of polymerization (k) of polyglycerol was calculated by measuring the hydroxyl value (mgKOH / g) of the polyglycerol using the following calculation formula (2). The hydroxyl value was determined by acetylation of the hydroxyl groups in 1 g of sample with acetic anhydride and pyridine, followed by hydrolysis with excess acetic anhydride and titration of the generated acetic acid with potassium hydroxide.

[0035] Formula (2):

[0036] Average degree of polymerization of polyglycerol (k) = (112200-18×[hydroxyl value]) / (74.08×[hydroxyl value]-56100)

[0037] Here, as [C3H6O2] k The specific structure of can include one or more structures selected from the following formulae (1-1) to (1-5).

[0038]

[0039] Here, q, r, s, and t represent integers greater than 1, and [C3H6O2] has the same meaning as described above. From the viewpoint of producing a stable skin cleanser composition, polyglycerol-3 is preferred.

[0040] The inclusion of (b1) diglycerol in the skin cleanser composition of the present invention can inhibit the crystal growth of the acylamino acid surfactant (A) and the precipitation of the clay mineral (C), thereby achieving high stability of the skin cleanser composition. From the perspective of inhibiting the crystal growth of the acylamino acid surfactant and the precipitation of the clay mineral, the content of (b1) diglycerol is preferably 5% by mass or more, more preferably 8% by mass or more, and even more preferably 14% by mass or more, and is preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 16% by mass or less.

[0041] The skin cleanser composition of the present invention can be made more stable by containing (b2) monoglycerol and / or a polyglycerol other than (b1). From the perspective of improving the stability of the skin cleanser composition, the content of (b2) monoglycerol and / or a polyglycerol other than (b1) (i.e., the content of component (b2)) is preferably 25% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass or more, and is preferably less than 60% by mass, more preferably 55% by mass or less, and even more preferably 50% by mass or less.

[0042] In the skin cleansing composition of the present invention, from the viewpoint of suppressing the crystal growth of the acylamino acid surfactant of the component (A) and suppressing the precipitation of the clay mineral (C), thereby achieving high stability of the skin cleansing composition, the total content of the glycerin component (B), that is, the total content of (b1) diglycerol and (b2) monoglycerol and / or polyglycerol other than (b1) ((b1) + (b2)) in the skin cleansing composition of the present invention is preferably 25% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass or more, and is preferably 60% by mass or less, more preferably 55% by mass or less, and even more preferably 50% by mass or less.

[0043] In the skin cleansing composition of the present invention, from the viewpoint of suppressing the precipitation of clay minerals and maintaining crystal stability, the mass ratio of (b1) diglycerol to the content of (b2) monoglycerol and / or polyglycerol other than (b1) ((b1) / (b2)) is preferably 0.1 or more, more preferably 0.3 or more, even more preferably 0.5 or more, and is preferably 0.8 or less, more preferably 0.7 or less, and even more preferably 0.6 or less.

[0044] [Ingredient (C)]

[0045] The skin cleansing composition of the present invention contains a clay mineral as component (C). The inclusion of the clay mineral as component (C) in the skin cleansing composition of the present invention can impart various functions such as a sebum adsorption function and an acne bacteria inhibitory function.

[0046] The component (C) clay mineral of the present invention is a mineral constituting clay, and its main component is a layered silicate mineral (pyroxene silicate mineral). As representative clay minerals, kaolin, montmorillonite, Stevensite, sericite, talc, etc. can be enumerated, and sediments such as sea mud are also included. As specific clay mineral raw materials, for example, volcanic mud, Japanese Tanakura clay, kaolin, talc, Moroccan lava clay, zeolite, mica, etc. can be enumerated. By including component (C) clay mineral, it is possible to make the skin cleanser composition more stable. From the viewpoint of the effect of improving the stability of the skin cleanser composition, it is preferably kaolin, volcanic mud, more preferably volcanic mud, and further preferably volcanic mud consisting of rhyolite.

[0047] The particle size of the clay mineral (component (C)) of the present invention is preferably 100 μm or less, more preferably 60 μm or less, even more preferably 50 μm or less, even more preferably 40 μm or less, even more preferably 30 μm or less, even more preferably 20 μm or less, and particularly preferably 14 μm or less. This particle size can be measured, for example, by the laser diffraction scattering method (JIS Z8825:2013).

[0048] In the skin cleanser composition of the present invention, from the viewpoint of suppressing precipitation of the clay mineral (C) and maintaining crystal stability, the content of the clay mineral (C) is preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 5% by mass or less, even more preferably 4.7% by mass or less, and even more preferably 4.5% by mass or less.

[0049] On the other hand, from the viewpoint of sebum adsorption and oil control, the content of the clay mineral as component (C) in the skin cleanser composition of the present invention is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, and particularly preferably 1.0% by mass or more, and preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 5% by mass or less, even more preferably 4.7% by mass or less, and even more preferably 4.5% by mass or less.

[0050] [Ingredient (D)]

[0051] The skin cleanser composition of the present invention also preferably contains (D) water. Regarding (D) water, distilled water or ion-exchanged water is preferably used from the viewpoint of not affecting storage stability. The content of (D) water includes not only the amount of water formulated but also the water contained in other ingredients. Regarding the content of (D) water (water), in addition to varying depending on the components (A), (B), and (C), it also varies based on the amount of other ingredients included as needed. From the viewpoint of the sprayability, foaming properties, maintenance of good foam quality, feel during use, and storage stability of the container, the content of (D) water in the skin cleanser composition of the present invention is preferably 15% by mass or more, more preferably 17.5% by mass or more, further preferably 18.5% by mass or more, and preferably 45% by mass or less, more preferably 30% by mass or less, further preferably 26% by mass or less, and particularly preferably 23% by mass or less.

[0052] [pH]

[0053] To achieve good stability and reduce skin irritation, the pH of the skin cleanser composition of the present invention is preferably below pH 7, more preferably below pH 6.9, and even more preferably below pH 6.8. Furthermore, it is preferably at least pH 5.5, and even more preferably at least pH 5.9. Furthermore, conventional bases such as sodium hydroxide, potassium hydroxide, triethanolamine, and ammonia, as well as conventional acids such as hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, citric acid, malic acid, lactic acid, fumaric acid, and succinic acid, may be added as needed to adjust the pH to the desired value. The pH is generally measured by immersing a pH measuring electrode in the undiluted skin cleanser composition of the present invention for 3 minutes after the composition is stored in a thermostatic bath at 20°C.

[0054] [Other ingredients]

[0055] The skin cleansing composition of the present invention may further contain other components generally used in cleansing compositions in addition to the above-mentioned components, within a range not inhibiting the effects of the present invention.

[0056] Examples of such other components include fatty acids or their salts, such as lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, oleic acid, linolenic acid, linoleic acid, oxidized stearic acid, undecylenic acid, lanolin fatty acid, coconut oil fatty acid, etc.; polyols other than component (B), such as 1,3-butylene glycol, propylene glycol, polyethylene glycol, and dipropylene glycol; polysaccharides derived from plants such as guar gum, polysaccharides derived from microorganisms such as xanthan gum, celluloses such as hydroxypropyl cellulose and carboxymethyl cellulose, and esters having a polyoxyethylene chain in the molecule. Or ether compounds, acrylic acid polymers or acrylic acid / methacrylate copolymers and other carboxyvinyl polymers and other thickeners, alkyl polyglycosides, polyoxyethylene alkyl ethers, polyoxyalkylene sorbitan fatty acid esters and other non-ionic surfactants; alkyl sulfates or their salts, polyoxyethylene alkyl ether sulfates or their salts and other ingredients; betaines such as cocoyl betaine and cocamidopropyl betaine; colorants such as dyes; inorganic salts; plant extracts; preservatives; chelating agents; vitamins; anti-inflammatory agents; fragrances; ultraviolet absorbers; antioxidants, bactericides, etc.

[0057] [Viscosity]

[0058] The viscosity of the skin cleansing composition of the present invention at 20° C. is preferably 30 to 3000 Pa·s, more preferably 100 to 1500 Pa·s, and even more preferably 150 to 1000 Pa·s from the viewpoint of tube dischargeability.

[0059] The viscosity of the skin cleanser composition of the present invention is measured using a Brookfield viscometer (Toki Sangyo, TVB-10) at 20°C, 5 rpm, and a measurement time of 60 seconds. Appropriate fixtures can be used for different viscosity ranges. For example, the TF is used for viscosities of 400 to 4000 Pa·s; the TE is used for viscosities of 200 to 2000 Pa·s; the TD is used for viscosities of 80 to 800 Pa·s; the TC is used for viscosities of 40 to 400 Pa·s; and the TB is used for viscosities of 16 to 160 Pa·s.

[0060] The skin cleansing composition of the present invention is produced by using the above-mentioned components, for example, according to the production method described in the following Examples.

[0061] The skin cleansing composition is preferably used for skin cleansing, and more preferably used as a face cleansing composition.

[0062] The skin cleanser composition of the present invention is used to cleanse the skin using conventional skin cleansing methods. Cleansing methods include hand cleansing and cleansing using a sponge, towel, or facial cleansing cloth made of chemical fibers such as cotton or nylon. However, from the perspective of reducing skin irritation and effectively utilizing the foaming properties and feel of the present invention, direct hand cleansing is preferred.

[0063] The skin cleanser composition of the present invention contains a low-irritation acylamino acid surfactant (A), making it suitable for cleansing various skin types, including sensitive skin, dry skin, combination skin, and oily skin. Furthermore, since it contains a clay mineral (C) that has multiple functions, such as sebum adsorption and acne-inhibiting properties, it is particularly suitable for cleansing oily skin.

[0064] Regarding the above-mentioned embodiment of the present invention, the following skin cleansing composition is further disclosed.

[0065] [1] A skin cleanser composition comprising the following components (A) to (D):

[0066] (A) acylamino acid surfactant: 5-40% by mass;

[0067] (B) Glycerol: 25-60% by mass;

[0068] (C) Clay minerals: 0.05 to 10% by mass;

[0069] (D) Water: 15-45% by mass

[0070] The glycerol component (B) includes (b1) diglycerol and (b2) monoglycerol and / or polyglycerol other than (b1).

[0071] [2] The skin cleanser composition according to [1], wherein the content of the acylamino acid surfactant (A) in the skin cleanser composition is preferably 5% by mass or more, more preferably 17% by mass or more, even more preferably 20% by mass or more, and is preferably 40% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, and particularly preferably 23% by mass or less.

[0072] [3] The skin cleanser composition according to [1] or [2], wherein the acyl group in the acylamino acid surfactant (A) has 8 to 18 carbon atoms, preferably 8 to 16 carbon atoms, more preferably 12 to 16 carbon atoms, and the acyl group is preferably an acyl group derived from a saturated or unsaturated linear or branched fatty acid or a mixed fatty acid, preferably an acyl group derived from caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, coconut oil fatty acid, or palm kernel oil fatty acid, more preferably an acyl group derived from lauric acid, myristic acid, palmitic acid, oleic acid, coconut oil fatty acid, or palm kernel oil fatty acid, further preferably an acyl group derived from lauric acid, myristic acid, coconut oil fatty acid, or palm kernel oil fatty acid, and particularly preferably an acyl group derived from coconut oil fatty acid.

[0073] [4] The skin cleanser composition according to any one of [1] to [3], wherein the amino acid residue in the acylamino acid surfactant (A) is a residue derived from at least one amino acid selected from glutamic acid, aspartic acid, glycine, and alanine.

[0074] [5] The skin cleanser composition according to any one of [1] to [4], wherein the component (A) contains (a1) an N-acylglycine salt.

[0075] [6] The skin cleanser composition according to any one of [1] to [5], wherein the component (A) contains (a1) an N-acyl glycinate and (a2) an N-acyl alanine salt.

[0076] [7] The skin cleanser composition according to [6], wherein the mass ratio (a1) / (a2) of the content of the (a1) N-acyl glycinate to the content of the (a2) N-acyl alanine salt is preferably 1 to 15, more preferably 2 to 12, and even more preferably 5 to 8.

[0077] [8] The skin cleanser composition according to any one of [1] to [7], wherein the content of diglycerol (b1) in the skin cleanser composition is preferably 5% by mass or more, more preferably 8% by mass or more, and even more preferably 14% by mass or more, and is preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 16% by mass or less.

[0078] [9] The skin cleanser composition according to any one of [1] to [8], wherein the content of (b2) monoglycerol and / or polyglycerol other than (b1) in the skin cleanser composition is preferably 25% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass or more, and is preferably less than 60% by mass, more preferably 55% by mass or less, and even more preferably 50% by mass or less.

[0079]

[10] The skin cleanser composition according to any one of [1] to [9], comprising monoglycerol and a polyglycerol other than (b1) as the component (b2).

[0080]

[11] The skin cleanser composition according to any one of [1] to

[10] , wherein the polyglycerol other than (b1) is a compound represented by the following formula (1):

[0081]

[0082] In formula (1), [C3H6O2] is a glycerol unit, k is the average polymerization degree of [C3H6O2], and k is a number from 3 to 10.

[0083]

[12] A skin cleanser composition as described in any one of [1] to

[11] , wherein the total content of the glycerols as component (B), i.e., the total content of (b1) diglycerol and (b2) monoglycerol and / or polyglycerol other than (b1) ((b1) + (b2)) in the skin cleanser composition is preferably 25% by mass or more, more preferably 30% by mass or more, further preferably 40% by mass or more, and is preferably 60% by mass or less, more preferably 55% by mass or less, further preferably 50% by mass or less.

[0084]

[13] A skin cleanser composition according to any one of [1] to

[12] , wherein the mass ratio (b1) / (b2) of the content of (b1) diglycerol to the content of (b2) monoglycerol and / or polyglycerol other than (b1) in the skin cleanser composition is preferably 0.1 or more, more preferably 0.3 or more, further preferably 0.5 or more, and preferably 0.8 or less, more preferably 0.7 or less, further preferably 0.6 or less.

[0085]

[14] A skin cleanser composition as described in any one of [1] to

[13] , wherein the clay mineral of component (C) is at least one selected from kaolin, montmorillonite, saponite, sericite, talc, and sea mud; further, the clay mineral of component (C) is at least one selected from volcanic mud, Japanese Tanakura clay, kaolin, talc, Moroccan lava clay, zeolite, and mica; the clay mineral of component (C) is kaolin; the clay mineral of component (C) is at least one selected from volcanic mud and kaolin; the clay mineral of component (C) is volcanic mud; the clay mineral of component (C) is volcanic mud composed of rhyolite.

[0086]

[15] The skin cleanser composition according to any one of [1] to

[14] , wherein the particle size of the clay mineral of component (C) is preferably 100 μm or less, more preferably 60 μm or less, further preferably 50 μm or less, further preferably 40 μm or less, further preferably 30 μm or less, further preferably 20 μm or less, and particularly preferably 14 μm or less.

[0087]

[16] A skin cleanser composition according to any one of [1] to

[15] , wherein the content of the clay mineral as component (C) in the skin cleanser composition is preferably 10% by mass or less, more preferably 8% by mass or less, further preferably 5% by mass or less, further preferably 4.7% by mass or less, particularly preferably 4.5% by mass or less, and preferably 0.1% by mass or more, more preferably 0.2% by mass or more, further preferably 0.3% by mass or more, particularly preferably 0.5% by mass or more.

[0088]

[17] The skin cleanser composition according to any one of [1] to

[16] , wherein the content of (D) water in the skin cleanser composition is preferably 15% by mass or more, more preferably 17.5% by mass or more, further preferably 18.5% by mass or more, preferably 45% by mass or less, more preferably 30% by mass or less, further preferably 26% by mass or less, and particularly preferably 23% by mass or less.

[0089]

[18] The skin cleanser composition according to any one of [1] to

[17] , wherein the pH of the skin cleanser composition at 20°C is preferably less than 7, more preferably pH 6.9 or less, further preferably pH 6.8 or less, and preferably pH 5.5 or more, more preferably pH 5.9 or more.

[0090]

[19] The skin cleanser composition according to any one of [1] to 18], wherein the viscosity of the skin cleanser composition at 20°C is preferably 30 to 3000 Pa·s, more preferably 100 to 1500 Pa·s, and even more preferably 150 to 1000 Pa·s.

[0091]

[20] The skin cleanser composition according to any one of [1] to

[19] , wherein the skin cleanser composition is a hand wash, a facial cleanser or a body wash, and more preferably a facial cleanser.

[0092]

[21] Use of the skin cleanser composition according to any one of [1] to

[20] for producing a skin cleanser.

[0093]

[22] Use of the skin cleanser composition according to any one of [1] to

[20] for cleansing the skin.

[0094]

[23] Use of the skin cleanser composition according to any one of [1] to

[20] for cleansing skin selected from sensitive skin, dry skin, combination skin, and oily skin.

[0095]

[24] Use of the skin cleanser composition according to any one of [1] to

[20] for direct hand application and hand cleansing.

[0096] Example

[0097] The present invention will be described in further detail below by way of examples. The scope of the present invention is not limited to these examples. In this specification, "%" means "mass %" unless otherwise specified.

[0098] Each skin cleanser composition was prepared according to the composition shown in Tables 1 to 4 by the following production method, the pH was measured by the following pH measurement method, and each evaluation was performed according to the following evaluation method. The results are shown in Tables 1 to 4.

[0099] [Manufacturing method]

[0100] Heat water and glycerin to 65-85°C and stir. Then, add the ingredients other than the clay mineral dispersion and stir while heating to 65-85°C. Then, cool while stirring, add the clay mineral dispersion at 50-60°C, and stir until uniform. Further, cool to 25°C while stirring to obtain a skin cleanser composition.

[0101] The following raw materials were used to produce the cleaning agents of the Examples and Comparative Examples.

[0102] Potassium Coconut Fatty Acid Acylglycinate: Trade name "AMILITE GCK-11(F)" (Manufacturer: Ajinomoto Co., Ltd.)

[0103] Sodium Coconut Fatty Acid Acylalaninate: Trade name "AMILITE ACS-12" (Manufacturer: Ajinomoto Co., Ltd.)

[0104] Rhyolite 60um: Trade name "MATERRA POWDER 60um UNDER" (Manufacturer: MATERRA Co., Ltd.)

[0105] Rhyolite 14um: Trade name "MATERRA POWDER 14um UNDER" (Manufacturer: MATERRA Co., Ltd.)

[0106] Kaolin: Trade name "2457 Kaolin" (manufacturer: Brenntag Specialties, Inc.)

[0107] Polyglyceryl-10 Myristate: Trade name "S FACE M-1001" (Manufacturer: Sakamoto Pharmaceutical Co., Ltd.)

[0108] <pH Measurement Method>

[0109] 50 mL of the skin cleanser composition obtained in each Example and Comparative Example was placed in a glass bottle and maintained at 20° C. in a thermostat. A pH measuring electrode (model: HORIBA, pH METER D-52) was immersed in the thermostated sample for 3 minutes to measure the pH value.

[0110] <Viscosity measurement method>

[0111] The viscosity of the skin cleanser composition was measured using a B-type viscometer (Toki Sangyo, TVB-10) at 20°C, 5 rpm, and a measurement time of 60 s. Appropriate fixtures were used for different viscosity ranges. For example, the TF was used for viscosities of 400-4000 Pa·s; the TE was used for viscosities of 200-2000 Pa·s; the TD was used for viscosities of 80-800 Pa·s; the TC was used for viscosities of 40-400 Pa·s; and the TB was used for viscosities of 16-160 Pa·s.

[0112] Evaluation Method

[0113] <Evaluation 1: Evaluation of Clay Mineral Precipitation>

[0114] The method for measuring the precipitation property is as follows.

[0115] 50 g of the sample was filled into a glass bottle, and the bottle was placed in a constant temperature chamber at 45°C, and the time required for precipitation was observed.

[0116] The results of the precipitation measurement were evaluated based on the following criteria.

[0117] Score 1: Precipitation occurred within 3 days.

[0118] Score 2: Precipitation occurred within 2 weeks.

[0119] Score 3: Precipitation occurred within 4 weeks.

[0120] Score 4: Precipitation occurred within 8 weeks.

[0121] <Evaluation 2: Evaluation of crystal stability>

[0122] The method for measuring crystallinity is as follows.

[0123] 50 g of the sample was placed in a glass bottle and allowed to stand in a thermostatic chamber at 20° C. for 2 weeks. The crystal morphology of the sample was observed using a polarizing microscope (Nikon, ECLIPSE LV100POL).

[0124] The crystallization measurement results were evaluated based on the following criteria.

[0125] Score 1: The crystal diameter is greater than 1000 μm.

[0126] Score 2: The crystal diameter is greater than 500 μm and less than 1000 μm.

[0127] Score 3: The crystal diameter is greater than 100 μm and less than 500 μm.

[0128] Score 4: The crystal diameter is less than 100 μm.

[0129] If the skin cleanser composition of the present invention has a score of "2" or higher in <Evaluation 1: Evaluation of Clay Mineral Precipitation>, there are no problems in practical use, and thus it is considered to be able to suppress clay mineral precipitation, and the evaluation is "good." A higher score in <Evaluation 1: Evaluation of Clay Mineral Precipitation> is more preferred.

[0130] For the skin cleanser composition of the present invention, if the score in <Evaluation 2: Evaluation of Crystal Stability> is "2" or higher, there are no problems in practical use, and the crystals in the composition are considered stable, and the evaluation is "good." The higher the score in <Evaluation 2: Evaluation of Crystal Stability>, the more preferred.

[0131] As shown in Tables 1 to 4, the skin cleansing compositions of the Examples inhibited clay mineral precipitation and exhibited high crystal stability. In contrast, the skin cleansing compositions of the Comparative Examples exhibited rapid clay mineral precipitation, low crystal stability, or both. Note that the mass % of each component in the Examples and Comparative Examples in Tables 1 to 4 represents the active ingredient amount.

[0132]

[0133]

[0134]

[0135]

Claims

1. A skin cleanser composition, wherein: Contains the following ingredients (A) to (D), (A) acylamino acid surfactant: 5-40% by mass; (B) Glycerol: 25-60% by mass; (C) Clay minerals: 0.05 to 10% by mass; (D) Water: 15-45% by mass Furthermore, (b1) diglycerol, (b2) monoglycerol, and / or polyglycerol other than (b1) are contained as the component (B) glycerols.

2. The skin cleanser composition according to claim 1, wherein The component (A) contains (a1) an N-acyl glycinate.

3. The skin cleanser composition according to claim 1, wherein The component (A) comprises (a1) an N-acyl glycinate and (a2) an N-acyl alanine salt.

4. The skin cleanser composition according to claim 1, wherein The content of the component (A) is 17 to 30% by mass.

5. The skin cleanser composition according to claim 1, wherein The content of the component (A) is 20 to 25% by mass.

6. The skin cleanser composition according to claim 1, wherein The component (B) is contained in an amount of 30 to 55% by mass.

7. The skin cleanser composition according to claim 1, wherein The component (B) is contained in an amount of 40 to 50% by mass.

8. The skin cleanser composition according to claim 1, wherein The (b1) diglycerin is contained in an amount of 5 to 20% by mass.

9. The skin cleanser composition according to claim 1, wherein The monoglycerol (b2) and / or polyglycerol other than (b1) are contained in an amount of 25 to 50% by mass.

10. The skin cleansing composition according to claim 1, wherein The content of the component (C) is 0.1 to 8% by mass.

11. The skin cleansing composition according to claim 1, wherein The content of the component (C) is 0.2 to 5% by mass.

12. The skin cleansing composition according to claim 1, wherein The content of the component (C) is 0.3 to 4.7% by mass.

13. The skin cleansing composition according to claim 1, wherein The skin cleanser composition has a pH of less than 7 at 20°C.

14. The skin cleansing composition according to claim 1, wherein The component (C) is kaolin.

15. The skin cleansing composition according to claim 1, wherein The particle size of the clay mineral as the component (C) is less than 100 μm.

16. The skin cleansing composition according to claim 14, wherein The component (C) is one or more selected from volcanic mud and kaolin.

17. The skin cleansing composition according to claim 14, wherein The component (C) is volcanic mud.

18. The skin cleansing composition according to claim 14, wherein The component (C) is volcanic mud composed of rhyolite.

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