Composition for skin cleansing

Abstract

To provide a skin cleansing composition that is low in irritation, has excellent foaming properties, and provides a superior user experience after washing. [Solution] The skin cleansing composition of the present invention is characterized by containing lauryl glucoside, lauramidopropyl betaine, and decyl glucoside, and having a pH of 4.0 to 6.0.

Description

Technical Field

[0001] The present invention relates to a composition for skin cleansing, and more particularly to a composition for cleansing the delicate zone of women.

Background Art

[0002] It is difficult for women to consult about their concerns regarding the delicate zone (genital area), and many women remain unable to consult while having these concerns. In recent years, various types of information and methods for resolving problems related to the delicate zone of women, such as femtech and femcare, have been proposed. Examples of problems in the delicate zone of women include, for example, itching, odor, rash, swelling, dryness, and the like.

[0003] Because it is a delicate zone, for example, excessive washing with ordinary soap can cause skin roughness, inflammation, and the like.

[0004] For example, Patent Document 1 discloses a skin care agent for the delicate zone containing plant-derived components, wherein the plant-derived components include grapefruit fruit extract, perilla leaf extract, tea leaf extract, chamomile flower extract, apple fruit extract, rosemary leaf extract, amacha leaf extract, kaki tannin, and flaxseed extract.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The pH of human skin is said to be around 4.5 to 6.0. Skin pH refers to the pH of the epidermal lipid film (sebum film) that thinly covers the skin surface. The epidermal lipid film exhibits a slightly acidic pH of 4.5-6.0 due to the influence of free fatty acids present in sebum and lactic acid and amino acids contained in sweat. For skin cleansing compositions, it is preferable to have a pH within the skin's pH range. If the pH deviates from the skin's pH range, it will become more irritating to the skin.

[0007] From this perspective, a mildly acidic (pH of around 4.5 to 6.0) cleanser is preferable for use in the delicate area. General-purpose soaps for the skin are alkaline. While alkaline soaps for the skin lather well and cleanse effectively, they have the problem of being too irritating for the delicate area.

[0008] On the other hand, mildly acidic soaps don't lather well, giving the impression that it's unclear whether they're actually cleaning effectively. Also, while commercially available mildly acidic soaps generally have a pH of around 6.5-7, compared to the pH of the skin, some are slightly alkaline and therefore less effective at reducing skin irritation.

[0009] Furthermore, because it is a delicate area, cleansers for the delicate zone are required to be free from stinging or stickiness after washing (usability). In addition, from the perspective of being low-irritation and gentle on the skin, there is a demand for cleansers for the delicate zone made from naturally derived ingredients.

[0010] This invention has been made in view of the above circumstances, and aims to provide a skin cleansing composition that is low in irritation, made from naturally derived raw materials, has excellent foaming properties, and provides a superior user experience after washing. [Means for solving the problem]

[0011] The skin cleansing composition of the present invention, which has been able to solve the aforementioned problems, is characterized by containing lauryl glucoside: more than 0% by mass and 1.0% by mass or less, lauramidopropyl betaine: 7.0% by mass or more and 10.0% by mass or less, and decyl glucoside: 0.5% by mass or more and 4.0% by mass or less, and having a pH of 4.0 to 6.0. The inventors have found that by combining three types of cleansing ingredients, lauryl glucoside, lauramidopropyl betaine, and decyl glucoside, a skin cleansing composition with excellent foaming properties in the weakly acidic range and excellent usability can be obtained, and have completed the present invention. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a skin cleansing composition made from naturally derived raw materials that is low in irritation, lathers well, and has a superior feel. [Modes for carrying out the invention]

[0013] The skin cleansing composition of the present invention is characterized by containing, as cleansing components, lauryl glucoside: greater than 0 mass and 1.0% by mass or less, lauramidopropyl betaine: 7.0% by mass or more and 10.0% by mass or less, and decyl glucoside: 0.5% by mass or more and 4.0% by mass or less. It is preferable to use naturally derived lauryl glucoside, lauramidopropyl betaine, and decyl glucoside.

[0014] The content of lauryl glucoside in the skin cleansing composition of the present invention is preferably greater than 0% by mass, more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, preferably 1.0% by mass or less, more preferably 0.9% by mass or less, and even more preferably 0.8% by mass or less.

[0015] The content of lauramidopropyl betaine in the skin cleansing composition of the present invention is preferably 7.0% by mass or more, more preferably 7.5% by mass or more, even more preferably 8.0% by mass or more, preferably 10.0% by mass or less, more preferably 9.5% by mass or less, and even more preferably 9.0% by mass or less.

[0016] The decyl glucoside content in the skin cleansing composition of the present invention is preferably 0.5% by mass or more, more preferably 0.75% by mass or more, even more preferably 1.2% by mass or more, preferably 4.0% by mass or less, more preferably 2.5% by mass or less, and even more preferably 2.0% by mass or less.

[0017] In the skin cleansing composition of the present invention, the total content of lauryl glucoside, lauramidopropyl betaine, and decyl glucoside is preferably 7.5% by mass or more, and more preferably 15.0% by mass or less.

[0018] The pH of the skin cleansing composition of the present invention is preferably 4.0 to 6.0, more preferably 5.0 to 6.0, and even more preferably 5.0 to 5.5. Maintaining a slightly acidic pH reduces irritation to the skin.

[0019] The skin cleansing composition of the present invention preferably contains a pH adjusting agent, and more preferably contains a naturally derived pH adjusting agent. Examples of the pH adjusting agent include lactic acid, citric acid, succinic acid, ascorbic acid, fumaric acid, maleic acid, or salts thereof, and preferred naturally derived pH adjusting agents are citric acid and sodium citrate.

[0020] The amount of the pH adjusting agent is preferably such that the pH of the skin cleansing composition is 4.0 to 6.0, more preferably 5.0 to 6.0, and even more preferably 5.0 to 5.5. The content of the pH adjusting agent is not particularly limited, but is preferably 0.05% to 1.0% by mass, and more preferably 0.1% to 0.7% by mass.

[0021] The skin cleansing composition of the present invention preferably contains a moisturizer, and more preferably a naturally derived moisturizer. Examples of naturally derived moisturizers include proteins such as water-soluble collagen, elastin, and keratin, or their derivatives, hydrolysates and salts thereof, mucopolysaccharides such as hyaluronic acid and chondroitin sulfate and their derivatives, amino acids such as serine, glycine, theanine, aspartic acid, and arginine and their derivatives, sorbitol, erythritol, trehalose, inositol, glucose, xylitol, sucrose and its derivatives, dextrin and its derivatives, sugars such as honey, D-panthenol and its derivatives, glycolipids, and ceramides. By incorporating these moisturizers, it is possible to prevent skin dryness and moisturize the skin.

[0022] Specific examples of the aforementioned humectants include glycerin, diglycerin, triglycerin, polyglycerin, propanediol, 2,3-butanediol, 3-methyl-1,3-butanediol (isopropylene glycol), 1,3-butylene glycol, isoprene glycol, polyethylene glycol, 1,2-pentanediol (pentylene glycol), 1,2-hexanediol, propylene glycol, dipropylene glycol, polypropylene glycol, ethylene glycol, diethylene glycol, triethylene glycol, pentaerythritol, neopentyl glycol, and the like.

[0023] As the natural moisturizer, it is preferable to use glycerin, propanediol, 2,3 - butanediol, sodium hyaluronate, water - soluble collagen, hydrolyzed hyaluronic acid, DL - pyrrolidone carboxylic acid sodium solution (PCA - Na), honey, and betaine (trimethylglycine), etc.

[0024] The content rate of the moisturizer in the skin cleansing composition of the present invention is not particularly limited, but preferably 5% by mass or more, and more preferably 15% by mass or less.

[0025] The skin cleansing composition of the present invention preferably contains a thickener. As the thickener, for example, natural - derived water - soluble polymers are preferred.

[0026] The water - soluble polymer is used to improve the stability, usability, and feel of use of the system, and also to obtain a moisturizing effect. Specific examples of the water - soluble polymer include plant - based water - soluble polymers such as gum arabic, guar gum, carrageenan, pectin, agar, locust bean gum, cellulose; Microbial - fermentation - derived water - soluble polymers such as xanthan gum, gellan gum; animal - based water - soluble polymers such as casein, gelatin; starch - based water - soluble polymers such as starch; seaweed - derived water - soluble polymers such as sodium alginate; inorganic - based water - soluble polymers such as bentonite, hectorite, etc.

[0027] Examples of the cellulose - based water - soluble polymer include methyl cellulose, ethyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, nitrocellulose, hydroxypropyl methyl cellulose, crystalline cellulose, etc.

[0028] When the skin cleansing composition of the present invention contains a thickening agent, a thickening agent that does not inhibit the foaming properties of the cleansing components is preferred. Hydroxypropyl methylcellulose and gum arabic are preferred thickening agents that do not inhibit the foaming properties of the cleansing components. By using hydroxypropyl methylcellulose and gum arabic as thickening agents, good shape retention after foaming is achieved. Hydroxypropyl methylcellulose and gum arabic are preferably of natural origin.

[0029] The content of the thickening agent in the skin cleansing composition of the present invention is not particularly limited, but is preferably 0.01% by mass or more, and more preferably 1% by mass or less.

[0030] The skin cleansing composition of the present invention preferably contains human oligopeptide-1. The inclusion of human oligopeptide-1 enhances cell proliferation. Human oligopeptide-1 is preferably excipient-formed. For example, mannitol is a preferred excipient.

[0031] The skin cleansing composition of the present invention may further contain, as necessary and to the extent that it does not impair the effects of the present invention, ingredients commonly used in formulations such as cosmetics, external pharmaceuticals, and topical pharmaceuticals, such as water (purified water, hot spring water, deep sea water, etc., as well as water obtained when plants are steam-distilled), oils, surfactants (including emulsifiers), powders, alcohols, resins, inclusion compounds, antibacterial agents, preservatives, fragrances, deodorants, salts, cooling agents, extracts derived from plants, animals, and microorganisms, blood circulation promoters, whitening agents, cell activators, UV protectants, anti-inflammatory agents, antioxidants, astringents, anti-seborrheic agents, free radical scavengers, chelating agents, keratolytic agents, enzymes, hormones, vitamins, etc. Specific examples of preferred ingredients are listed below. Here, "derivative" includes salts that can be formed.

[0032] As for the oils used, any oils commonly used in cleaning agents can be used to improve the feel of use, regardless of their properties such as being solid, semi-solid, or liquid. These include hydrocarbons, waxes, fatty acids, higher alcohols, and ester oils. Examples of preferred oils include hydrocarbons such as squalane and petrolatum, plant and animal-derived oils such as castor oil and mink oil, and waxes such as beeswax, carnauba wax, candelilla wax, and gay wax. Naturally derived oils are preferred.

[0033] Examples of alcohols include lower alcohols such as ethanol and isopropanol, higher alcohols such as cetanol and behenyl alcohol, glycerin, diglycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol (BG), 2,3-butanediol, propanediol, pentylene glycol, polyethylene glycol, and the like.

[0034] Examples of animal or microorganism-derived extracts include serum deproteinized, spleen, egg components from birds, eggshell membrane extract, chicken comb extract, seashell extract, shellfish meat extract, royal jelly, silk protein and its degradation products or derivatives, hemoglobin or its degradation products, lactoferrin or its degradation products, mollusks such as squid ink, fish meat, animal-derived extracts from birds, shellfish, insects, fish, mollusks, etc., and microorganism-derived extracts such as reishi mushroom extract. By incorporating animal or microorganism-derived extracts, moisturizing effects, cell-activating effects, whitening effects, anti-inflammatory effects, free radical scavenging effects, and blood circulation-promoting effects can be imparted.

[0035] There are no particular restrictions on the plant part used for extraction or the extraction method. For example, the whole plant, or roots, stems, trunks, bark, buds, leaves, flowers, fruits, seeds, etc., can be used for extraction. These can be dried, chopped, pressed, or fermented as appropriate, and extracted at low temperatures or at room temperature to warm temperatures using various suitable solvents. As extraction solvents, one or more types can be used, such as water; lower monohydric alcohols such as methanol and ethanol; or liquid polyhydric alcohols such as glycerin, propylene glycol, and 1,3-butylene glycol. Extraction can also be performed using lipophilic solvents such as hexane, acetone, ethyl acetate, and ether, or with oily components such as squalane. The obtained extract can be filtered, adsorbed, decolorized, or purified to obtain a solution, paste, gel, or powder. If necessary, further purification treatments such as deodorization and decolorization may be performed to the extent that it does not affect the effect. As for the extraction method, for example, the extraction methods described above to obtain each extract can be employed.

[0036] As for plants, these include Alpinia zerumbet, asparagus, wild rose (Rosa multiflora), raspberry, Sophora flavescens (Sophora flavescens), Lilium maculatum, coffee, rice, Asarum sieboldii, hawthorn, white lily, peony, tea, beech, hops, mocca, saxifrage, Althaea, Angelica keiskei, Arnica, Nettle, Urtica dioica, Phellodendron amurense, Hypericum erectum, Honeysuckle (Lonicera japonica), Salvia (Sage) Examples of plant extracts include Lithospermum erythrorhizon, Birch, Soapberry, Astragalus sinicus, Ginkgo biloba, Barley, Swertia japonica, Jujube (Ziziphus jujuba), Rosemary (Rosemary), Coptis japonica, Grapefruit, Gentian, Soapwort, Sweet flag, Rehmannia glutinosa, Cnidium officinale, Malva serrata (Almond lily), Witch hazel, Coltsfoot, Prunus serrulata, Linden, Horse chestnut, Quince, and Bearberry leaves. By incorporating plant extracts, moisturizing effects, cell-activating effects, whitening effects, anti-inflammatory effects, free radical scavenging effects, and blood circulation-promoting effects can be imparted. (Note: The names in parentheses are alternative names for the plants or names of crude drugs.)

[0037] Examples of antibacterial alcohols include methanol, ethanol, propanol, isopropanol, butanol, isobutanol, tertiary butanol, 1,3-butylene glycol, propanediol, 2,3-butanediol, 1,2-pentanediol (pentylene glycol), 1,2-hexanediol, 1,2-octanediol, benzyl alcohol, phenylethanol, phenylpropanol, phenylbutanol, phenylpentanol, phenylhexanol, and phenoxyethanol.

[0038] Preferred antibacterial agents include 1,2-pentanediol (pentylene glycol), sodium anisate, and sodium levulinate.

[0039] Reactive oxygen species scavengers are used to suppress the production of lipid peroxides caused by ultraviolet light, and include superoxide dismutase, quercetin, catechin and its derivatives, thiamines (thiamine hydrochloride, thiamine sulfate), riboflavins (riboflavin, riboflavin acetate, etc.), pyridoxines (pyridoxine hydrochloride, pyridoxine dioctanoate, etc.), nicotinic acids (nicotinamide, benzyl nicotinate, etc.), and other B vitamins; dibutylhydroxytoluene and butylhydroxyanisole, etc. By incorporating these reactive oxygen species scavengers, dullness can be suppressed and a higher anti-aging effect can be achieved. Naturally derived reactive oxygen species scavengers are preferred.

[0040] Blood circulation promoters are used to promote melanin excretion by stimulating blood flow to the skin, and examples include capsicum tincture and γ-oryzanol, while enzymes such as lipase and papain can be used. Combining these can further enhance anti-aging effects. Naturally derived blood circulation promoters are preferred.

[0041] Examples of whitening agents include vitamin C and its derivatives (L-ascorbic acid phosphate, L-ascorbic acid sulfate, L-ascorbyl dipalmitate, L-ascorbyl tetraisopalmitate, etc.), glabridin, glabrene, liquiritin, isoliquiritin, and licorice extracts containing these. Naturally derived whitening agents are preferred.

[0042] Examples of antioxidants include vitamin E (tocopherol) and its derivatives (dl-α(β,γ)-tocopherol, dl-α-tocopherol acetate, dl-α-tocopherol nicotinate, dl-α-tocopherol linoleate, dl-α-tocopherol succinate, and other tocopherols and their derivatives, ubiquinones, etc.), vitamin D and its derivatives (ergocalciferol, cholecalciferol, dihydroxystanal, etc.), rutin and its derivatives, thiotaurine, taurine, hydroquinone and its derivatives, histidine, catechin and its derivatives, etc. Naturally derived antioxidants are preferred.

[0043] Examples of anti-inflammatory agents include glycyrrhizic acid and its derivatives, and glycyrrhetinic acid and its derivatives. Naturally derived anti-inflammatory agents are preferred.

[0044] As for the fragrance, naturally derived fragrances are preferred. Examples of naturally derived fragrances include plant-derived fragrances isolated from flowers, leaves, wood, fruit peels, etc., and animal-derived fragrances such as musk and civet. The skin cleansing composition of the present invention preferably contains rosehip flower water as a fragrance.

[0045] The remainder of the skin cleansing composition of the present invention is preferably water. Water is a naturally derived raw material. The water content of the remainder is preferably 60% by mass or more, more preferably 65% ​​by mass or more, even more preferably 70% by mass or more, preferably 85% by mass or less, more preferably 80% by mass or more, and even more preferably 75% by mass or less.

[0046] The skin cleansing composition of the present invention preferably consists only of naturally derived raw materials as defined in ISO 16128. This is because it results in a cosmetic product with low skin irritation and safety.

[0047] Natural raw materials, as defined in ISO 16128, refer to raw materials of natural origin (excluding petroleum and natural gas), obtained through physical processing without chemical synthesis. Natural origin means derived from plants, animals, microorganisms, fungi, algae, minerals, and water. Examples of physical processing include drying, grinding, enzymatic decomposition, and microbial fermentation.

[0048] As defined in ISO 16128, naturally derived raw materials refer to raw materials obtained through chemical or biological processing involving intentional chemical modification, where the naturally derived portion exceeds 50%. Examples of chemical or biological processing involving intentional chemical modification include electrolysis, hydrolysis, and genetic modification.

[0049] The natural index as defined in ISO 16128 is an index that indicates the percentage of natural raw materials included. The index for raw materials is shown on a scale of 0 to 1, and the index for the product is shown as a percentage.

[0050] The natural origin index specified in ISO 16128 is an index that indicates the natural portion of naturally derived raw materials. The index for a single raw material is shown as a value between 0 and 1, while the index for mixed raw materials and products is shown as a percentage. Whether or not water is included should be clearly indicated near the index. If water is included, it is common to indicate what percentage of the index is water.

[0051] The skin cleansing composition of the present invention preferably has a naturally derived index (including water) of 90.0% or more, more preferably 93.0% or more, and most preferably 95.0% or more, as defined in ISO 16128.

[0052] The skin cleansing composition of the present invention is preferably dispensed in a foamy state from a foaming container and used. The foaming container is not particularly limited as long as it can dispense the skin cleansing composition of the present invention in a foamy state by mixing it with air, and can be appropriately selected depending on the purpose. For example, a foaming container that can dispense foam by pressing down on the pump part is an example.

[0053] The foaming container typically has a porous membrane for forming foam, and foam is formed when the skin cleansing composition in the foaming container passes through the porous membrane. Examples of materials for the porous membrane include plastic materials such as nylon, polyester, and polyolefin. The mesh of the porous membrane is preferably 100 to 400 mesh, from the viewpoint of ease of pumping the foaming container in a low-temperature environment and the fineness of the foam. If the mesh of the porous membrane is less than 100 mesh, the fineness of the foam may be insufficient, and if it exceeds 400 mesh, it may be difficult to pump the foaming container in a low-temperature environment.

[0054] The number of porous membranes is preferably 2 to 4, from the viewpoint of ease of pumping the foamer container in a low-temperature environment and the fineness of the foam. If the number of porous membranes is less than 2, the fineness of the foam may be insufficient, and if it exceeds 4, the pump of the foamer container may become difficult to pump in a low-temperature environment. [Examples]

[0055] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples, and any modifications and embodiments that do not depart from the spirit of the present invention are all included within the scope of the present invention.

[0056] [Preparation of skin cleansing compositions] Compositions No. 1 to No. 5 for skin cleansing were prepared by blending the raw materials shown in Table 1. All components used in the skin cleansing compositions of this invention are naturally derived raw materials. The results of the evaluation of the obtained skin cleansing compositions are also shown in Table 1.

[0057] [Table 1]

[0058] The raw materials used are as follows: Damask rose flower water: Manufactured by Sunshine Corporation, Natural origin index 1 Lauryl glucoside: Manufactured by BASF Japan Ltd., Natural origin index 1 Lauramidopropyl betaine: Manufactured by Kao Corporation, natural origin index 0.83 (including water 0.65) Decyl glucoside: Seiwa Chemical Co., Ltd., Natural origin index 1 Glycerin: Manufactured by Kao Corporation, natural origin index 1 Human Oligopeptide-1 / Mannitol: Sold by Biolink Co., Ltd., Natural Origin Index 1 Hydroxypropyl methylcellulose: Manufactured by Shin-Etsu Chemical Co., Ltd., natural origin index 0.80 (including water 0.02) Sodium hyaluronate: Manufactured by SperaNexus Co., Ltd., Natural origin index 1 Hydrolyzed hyaluronic acid: Manufactured by Kewpie Corporation, natural origin index 1 Betaine: Manufactured by Asahi Kasei Finechem Co., Ltd., natural origin index 1 Gum arabic: Sunshine Corporation, Natural origin index 1 Propanediol: Manufactured by Primientovation, Natural Source Index 1 Water-soluble collagen / citric acid / sodium citrate: Manufactured by Koken Co., Ltd., natural origin index 1 (including 0.99g of added water) PCA-Na: Manufactured by Ajinomoto Healthy Supply Co., Ltd., Natural origin index 1 Alpinia speciosa extract: Manufactured by Shirai Matsushin Pharmaceutical Co., Ltd. Alpinia speciosa flower / leaf / stem water, natural origin index 1 Honey: Manufactured by Akita-ya Honten Co., Ltd., Natural origin index 1 Sodium levulinate / Sodium anisate / Water / Glycerin: Manufactured by GSI Creos Corporation, Natural origin index 1 Citric acid / Sodium citrate: Manufactured by Showa Kako Co., Ltd., Natural origin index 1

[0059] The skin cleansing compositions No. 1 and 2 of the present invention consist solely of naturally derived raw materials, with natural origin indices of 95.3% (including 72.3% water) and 95.3% (including 81.0% water), respectively.

[0060] The resulting skin cleansing composition was placed in a Biore U foaming pump dispenser from Kao Corporation, and its foaming properties were evaluated. The evaluation was conducted by 10 adult women, and the most frequent result was adopted.

[0061] (Foaming properties during dispensing) Judgment criteria ○: The amount of foam released is large, and the foam maintains its shape. △: The amount of foam that comes out is large, but the foam collapses as it touches the palm of your hand. ×: The amount of foam when it comes out is small, it's watery, and the foam collapses quickly.

[0062] (Fineness of bubbles during dispensing) Judgment criteria ○: Fine-grained △: Fine details ×: Large bubbles can also be seen.

[0063] (Foam shape retention (chewy texture)) Judgment criteria ○: When you touch the foam with your hand, it feels elastic. △: When you touch the foam with your hand, it lacks elasticity and the foam collapses easily. ×: When you spread the foam with your hands, the foam disappears easily.

[0064] (Ease of rinsing off foam) Judgment criteria ○: Can be rinsed off with running water in 15 seconds or less. △: Can be rinsed off with running water in 15 to 30 seconds. ×: It takes more than 30 seconds to rinse it off with running water.

[0065] (Feeling of use) Judgment criteria ○: After washing and drying with a towel, there is a moisturizing feeling. △: After washing and drying with a towel, there is no feeling of moisture. ×: After washing and wiping off the moisture with a towel, there is a slimy feeling.

[0066] The skin cleansing composition of the present invention was compared with commercially available foam-type soaps. The following commercially available products were used:

[0067] Commercial product A: Hand soap containing the following ingredients Isopropylmethylphenol, water, polyoxyethylene lauryl ether sulfate, ammonium (1E.O.) solution, PG, ethanol, PEG6000, POE lauryl ether acetate, glycerin ethylhexyl ether, acrylamide / acrylic acid / dimethyldiallylammonium chloride copolymer, trimethylammonium hydroxypropyl hydroxyethylcellulose chloride, EDTA salt, lactic acid, sodium hydroxide solution, benzoate, fragrance

[0068] Commercial product B: Foaming soap for the delicate area containing the following ingredients. Conazole nitrate, isopropylmethylphenol, PG, BG, concentrated glycerin, alkyl carboxymethyl hydroxyethyl imidazolinium betaine, sodium lauroyl methyl-β-alanine solution, coconut oil fatty acid diethanolamide, anhydrous citric acid, monosodium succinate, phenoxyethanol, water

[0069] Commercial product C: Foaming soap for the delicate area containing the following ingredients. Water, DPG, TEA-Cocoyl Glutamate, Pentylene Glycol, Lauryl Betaine, Cocamide DEA, Polyglyceryl-10 Laurate, Caprylyl Glycol, Sodium Hyaluronate, Hydrolyzed Collagen, Glycerin, Laurel Oil, Litsea Cubeba Fruit Oil, Cananga Odorata Flower Oil, Juniperus Virginiana Oil, Orange Peel Oil, Turpentine Oil, Pelargonium Graveolens Oil, Palmarosa Oil, Bitter Orange Leaf / Twig Oil, Chamaecyparis Obtusa Oil, Vetiver Root Oil, Bergamot Fruit Oil, Marjoram Leaf Oil, Eucalyptus Globulus Leaf Oil, Yuzu Peel Oil, Lime Oil, Lavandula Hybrida Oil, Citric Acid, Saxifraga Sarmentosa Extract, Grape Extract, BG, Morus Alba Root Bark Extract, Scutellaria Baicalensis Root Extract, Calendula Officinalis Flower Extract, Arginine, Sodium Citrate, Caprylhydroxamic Acid, Tetrasodium Etidronate, Disodium EDTA, Phenoxyethanol

[0070] Using the skin cleansing compositions of the present invention and commercially available products A to C, 80 mL of each cleanser was placed in an FII-100PE container (capacity 100 mL) with an FII foam pump manufactured by Gracel Co., Ltd., and the foaming properties were compared.

[0071] (Foaming properties) 15 pumps were applied to a 200mL transparent container, and the height of the foam immediately afterward was compared. The foaming properties of the skin cleansing compositions of the present invention were superior in the following order. The present invention's skin cleansing composition > Commercial product B, Commercial product C > Commercial product A

[0072] (Foam Fineness) 15 pumps were applied to a 200mL transparent container, and the fineness of the foam immediately afterward was visually evaluated. The fineness of the foam was best in the following order, with the foam of skin cleansing composition No. 7 of the present invention being the finest and most superior. The present invention's skin cleansing composition > Commercial product A > Commercial products B, C

[0073] (Foam shape retention time) 15 pumps were applied to a 200mL transparent container, and the foam shape after 30 minutes was compared. The foam shape retention time was excellent for the skin cleansing composition No. 7 of the present invention, in the order shown below, as it maintained its foam shape well. The skin cleansing composition of the present invention: Commercial product A > Commercial product C > Commercial product B

[0074] The results in Table 1 and the comparison with commercially available products show that the skin cleansing composition of the present invention, which contains lauryl glucoside: greater than 0% by mass and 1.0% by mass or less, lauramidopropyl betaine: 7.0% by mass or more and 10.0% by mass or less, and decyl glucoside: 0.5% by mass or more and 4.0% by mass or less, and has a pH of 4.0 to 6.0, is low-irritant, has excellent foaming properties, and provides a superior user experience after cleansing. [Industrial applicability]

[0075] The present invention is useful as a skin cleansing composition, and is particularly useful for cleansing the delicate areas of women.

Claims

1. Lauryl glucoside: greater than 0% by mass and 1.0% by mass or less Lauramidopropyl betaine: 7.0% by mass or more, and 10.0% by mass or less A skin cleansing composition characterized by containing decyl glucoside in an amount of 0.5% or more by mass and 4.0% or less by mass, and having a pH of 4.0 to 6.

0.

2. The skin cleansing composition according to claim 1, wherein the pH is 5.0 to 6.

0.

3. The skin cleansing composition according to claim 1, wherein the content of lauryl glucoside is 0.1% by mass to 0.8% by mass.

4. The skin cleansing composition according to claim 1, wherein the content of lauramidopropyl betaine is 7.0% to 9.0% by mass.

5. The skin cleansing composition according to claim 1, wherein the decyl glucoside content is 0.5% by mass to 2.5% by mass.

6. The skin cleansing composition according to claim 1, comprising hydroxypropyl methylcellulose and gum arabic as thickeners.

7. The skin cleansing composition according to claim 1, comprising glycerin, propanediol, sodium hyaluronate, water-soluble collagen, hydrolyzed hyaluronic acid, DL-pyrrolidone carboxylate sodium solution (PCA-Na), honey, and betaine (trimethylglycine) as a humectant.

8. The skin cleansing composition according to claim 1, comprising citric acid and sodium citrate as pH adjusters.

9. The skin cleansing composition according to claim 1, comprising Alpinia speciosa extract, Damask rose flower water, human oligopeptide-1, and mannitol.

10. A skin cleansing composition according to any one of claims 1 to 9, for use on the female genital area.

11. A skin cleansing composition according to claim 10, comprising only naturally derived raw materials as defined in ISO 16128.

12. The skin cleansing composition according to claim 11, wherein the naturally derived index as defined in ISO 16128 is 90.0% or more.

13. The skin cleansing composition according to claim 12, wherein the naturally derived index as defined in ISO 16128 is 95.0%.

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