JP2024093105A - Skin cleansing composition - Google Patents

Abstract

[Problem] To provide a skin cleanser composition which has excellent dispersibility of a scrubbing agent, excellent in terms of irritation, ease of use, and lack of tightness on the skin after use, and which has excellent persistence of irritation even when mixed with a composition containing a large amount of water.
SOLUTION
This skin cleanser composition contains (A) an oil that is solid at 25°C, (B) at least one water-soluble scrubbing agent selected from sugars and sugar alcohols, (C) at least one selected from polyoxyethylene hydrogenated castor oil having an HLB of less than 9 and polyoxyethylene hydrogenated castor oil fatty acid esters having an HLB of less than 9, and (D) a polyhydric alcohol, wherein when the skin cleanser composition contains (E) water, the content of the (E) water is 5 mass% or less based on the total amount of the skin cleanser composition.
[Selection diagram] None

Description

The present invention relates to a skin cleansing composition.

In recent years, there has been a demand for skin cleansing compositions that not only have the basic function of removing dirt, but also leave the skin in a good condition (no tightness, etc.) after use, and that contain a scrubbing agent that removes old keratin and dirt from pores, as well as providing a massage effect, etc.

For example, in order to provide a scrub-containing skin cleanser composition that is gentle on the skin, has excellent high-temperature stability, and exhibits high washability after use, a scrub-containing skin cleanser composition has been proposed that contains polyethylene glycol having a number-average molecular weight of 3,000 or less, a polyhydric alcohol, a specific nonionic surfactant, an oily solid component, an aqueous solid component, sodium chloride, and at least one of sodium carbonate and sodium bicarbonate (see, for example, Patent Document 1).
The scrubbing agent-containing skin cleansing composition described in Patent Document 1 contains sodium chloride as a water-soluble scrubbing agent, but the sodium chloride is highly irritating to the skin, and there have been concerns about the skin condition (particularly, a feeling of tightness of the skin) after use of the composition.
Furthermore, in conventional skin cleansing compositions, including the proposal described in Patent Document 1 above, the use of saccharides having moisturizing properties as scrubbing agents has been suggested; however, the saccharides dissolve quickly in the composition, making it difficult to obtain a scrubbing effect, and there have also been problems in that when the surface of the saccharide melts and aggregates, the scrubbing effect is weakened.

Therefore, a satisfactory skin cleansing composition that has excellent dispersibility of the scrubbing agent, excellent in terms of irritation, ease of use, and lack of tightness on the skin after use, and that has excellent irritation durability even when mixed with a composition containing a large amount of water, has not yet been provided, and there is currently a strong demand for such a composition to be provided as soon as possible.

JP 2021-080205 A

The present invention aims to solve the above-mentioned problems of the prior art and to achieve the following objectives. That is, the present invention aims to provide a skin cleansing composition that has excellent dispersibility of the scrubbing agent, excellent irritation, ease of use, and no tightness on the skin after use, and has excellent irritation persistence even when mixed with a composition containing a large amount of water.

As a result of intensive research conducted by the present inventors to achieve the above object, the present inventors have discovered that a skin cleansing composition containing (A) an oil that is solid at 25°C, (B) at least one water-soluble scrubbing agent selected from sugars and sugar alcohols, (C) at least one selected from polyoxyethylene hydrogenated castor oil having an HLB of less than 9 and polyoxyethylene hydrogenated castor oil fatty acid esters having an HLB of less than 9, and (D) a polyhydric alcohol, and that when the skin cleansing composition contains (E) water, the content of the (E) water is 5 mass% or less based on the total amount of the skin cleansing composition, thereby providing excellent dispersibility of the scrubbing agent, excellent irritation, ease of use, and lack of tightness on the skin after use of the skin cleansing composition, and excellent irritation persistence even when mixed with a composition containing a large amount of water.

The present invention is based on the above findings by the present inventors, and the means for solving the above problems are as follows.
＜1＞
(A) an oil that is solid at 25°C;
(B) at least one water-soluble scrubbing agent selected from sugars and sugar alcohols;
(C) at least one selected from polyoxyethylene hydrogenated castor oil having an HLB of less than 9 and polyoxyethylene hydrogenated castor oil fatty acid ester having an HLB of less than 9;
(D) a polyhydric alcohol,
When the skin cleanser composition contains (E) water, the content of (E) water is 5 mass% or less based on the total amount of the skin cleanser composition.
＜2＞
The skin cleanser composition according to <1>, wherein a mass ratio of the content of (C) to the content of (A) [(C)/(A)] is 3.4 or more and 30 or less.
＜3＞
The content of the (A) is 0.5% by mass or more and 7% by mass or less based on the total amount of the skin cleanser composition,
The content of the (B) is 20% by mass or more and 70% by mass or less based on the total amount of the skin cleanser composition,
The skin cleanser composition according to any one of <1> to <2>, wherein the content of the (C) is 5% by mass or more and 30% by mass or less based on the total amount of the skin cleanser composition.

The present invention can solve the above-mentioned problems of the prior art and achieve the above-mentioned objective, thereby providing a skin cleansing composition that is excellent in dispersibility of the scrubbing agent, excellent in terms of irritation, ease of use, and lack of tightness on the skin after use, and that has excellent persistence of irritation even when mixed with a composition containing a large amount of water.

(Skin cleansing composition)
The skin cleanser composition of the present invention contains (A) an oil that is solid at 25°C, (B) at least one water-soluble scrubbing agent selected from sugars and sugar alcohols, (C) at least one selected from polyoxyethylene hydrogenated castor oil having an HLB of less than 9 and polyoxyethylene hydrogenated castor oil fatty acid esters having an HLB of less than 9, and (D) a polyhydric alcohol, and may contain (E) water and other components (1) as necessary.
In this specification, "(A) oil that is solid at 25°C" may be referred to as "(A)" or "(A) component", "(B) at least one water-soluble scrubbing agent selected from sugars and sugar alcohols" may be referred to as "(B)", "(B) component", or "(B) scrubbing agent", "(C) at least one selected from polyoxyethylene hydrogenated castor oil having an HLB of less than 9, and polyoxyethylene hydrogenated castor oil fatty acid esters having an HLB of less than 9" may be referred to as "(C)" or "(C) component", "(D) polyhydric alcohol" may be referred to as "(D)" or "(D) component", and "(E) water" may be referred to as "(E)" or "(E) component".

<(A) Oil that is solid at 25°C>
The component (A) is contained mainly to impart dispersibility to the scrubbing agent (B) described below.

The component (A) is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of improving the lack of tightness of the skin after use of the skin cleansing composition, however, hydrocarbons, fatty acids and waxes are preferred, and waxes are more preferred.
These may be used alone or in combination of two or more.

-hydrocarbon-
The hydrocarbon is not particularly limited and can be appropriately selected depending on the purpose. Examples of the hydrocarbon include high melting point paraffin, microcrystalline wax, polyethylene wax, and petrolatum.
As the hydrocarbon, a synthetic product or a commercially available product may be used.
Examples of commercially available products of such hydrocarbons include, by trade name, SP-0165 (high melting point paraffin, manufactured by Nippon Seiro Co., Ltd.), refined microcrystalline wax (microcrystalline wax, manufactured by Nikko Rica Corporation), PMWAX82 (polyethylene wax, manufactured by Nikko Rica Corporation), Sunwhite P-150 (vaseline, manufactured by Nikko Rica Corporation), and Sunwhite P-200 (vaseline, manufactured by Nikko Rica Corporation).

-fatty acid-
The fatty acid is not particularly limited and can be appropriately selected depending on the purpose. Examples of the fatty acid include shea butter, lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid.
As the fatty acid, a synthetic product or a commercially available product may be used.
Examples of commercially available fatty acids include, by trade name, Star Shea Butter refined (shea butter, manufactured by The Hallstar Company), NAA-122 (lauric acid, manufactured by NOF Corporation), NAA-142 (myristic acid, manufactured by NOF Corporation), NAA-160 (palmitic acid, manufactured by NOF Corporation), NAA-180 (stearic acid, manufactured by NOF Corporation), and Isostearic Acid EX (isostearic acid, manufactured by Kokyu Alcohol Kogyo Co., Ltd.).

-Waxes-
The waxes are not particularly limited and can be appropriately selected depending on the purpose. Examples of the waxes include carnauba wax, candelilla wax, hydrogenated jojoba oil, rice bran wax, beeswax, Japan wax, and lanolin.
The waxes to be used may be appropriately synthesized or commercially available products.
Examples of commercially available waxes include, by trade name, refined carnauba wax R-100 (carnauba wax, manufactured by Yokoseki Oil Industries Co., Ltd.), refined candelilla wax MK-4 (candelilla wax, manufactured by Yokoseki Oil Industries Co., Ltd.), refined jojoba oil (hydrogenated jojoba oil, manufactured by Yokoseki Oil Industries Co., Ltd.), refined rice wax S-100 (rice bran wax, manufactured by Yokoseki Oil Industries Co., Ltd.), Kosan Dash sea beeswax (beeswax, manufactured by Miki Chemical Industry Co., Ltd.), VISCOSITY WAX C-1 (Japanese wax, manufactured by Yokoseki Oil Industries Co., Ltd.), and refined lanolin (lanolin, manufactured by Nippon Fine Chemical Co., Ltd.).

The content of the (A) component is not particularly limited and can be appropriately selected depending on the content of the (C) component described below. From the viewpoints of dispersibility of the scrubbing agent and usability, however, the content is preferably from 0.5% by mass to 7% by mass, and more preferably from 3% by mass to 5% by mass, based on the total amount of the skin cleanser composition.
It is preferable that the content of the component (A) is 0.5% by mass or more based on the total amount of the skin cleansing composition, since this leads to good usability.
It is preferable for the content of component (A) to be 7 mass % or less based on the total amount of the skin cleansing composition, since this improves the dispersibility of the scrubbing agent.

<(B) At least one water-soluble scrubbing agent selected from sugars and sugar alcohols>
The component (B) is contained mainly to impart an appropriate stimulating sensation.

The component (B) is not particularly limited and can be selected appropriately depending on the purpose, but monosaccharides, polysaccharides, and sugar alcohols are preferred from the viewpoint of providing a moderate stimulating sensation and its long-lasting effect.

-Monosaccharide-
The monosaccharide is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include glucose, fructose, xylose, mannose, galactose, etc. Among these, fructose is preferred from the viewpoint of providing an appropriate stimulating sensation and its persistence.
As the monosaccharide, a suitably synthesized one or a commercially available product may be used.

-Polysaccharides-
The polysaccharide is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include sucrose, trehalose, lactose, maltose, cellulose, etc. Among these, sucrose is particularly preferred from the viewpoint of providing an appropriate stimulating sensation and its persistence.

As the polysaccharide, a suitably synthesized one or a commercially available product may be used.
Commercially available products of the polysaccharide include, for example, trade names such as T.T.G.H granulated sugar (sucrose, particle size: 480-580 μm, manufactured by Toyo Sugar Refining Co., Ltd.), T.T.G.A special granulated sugar (sucrose, particle size: 250-290 μm, manufactured by Toyo Sugar Refining Co., Ltd.), and T.T.G. A Granulated sugar (sucrose, particle size: 380 to 460 μm, manufactured by Toyo Sugar Refining Co., Ltd.), trehalose (for cosmetics) (trehalose, manufactured by Hayashibara Co., Ltd.), lactose hydrate (lactose, manufactured by DMV-Fonterra Excipients GmbH & Co. KG), maltose white (maltose, manufactured by Hayashibara Co., Ltd.), maltose green (maltose, manufactured by Hayashibara Co., Ltd.), maltose S (maltose, manufactured by Hayashibara Co., Ltd.), IOGOMM'AGE W SERIES (cellulose, manufactured by Givaudan S.A.), and the like.

-Sugar alcohol-
The sugar alcohol is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include sorbitol, maltitol, xylitol, mannitol, lactitol, erythritol, etc. Among these, sorbitol, lactitol, and xylitol are preferred from the viewpoint of providing an appropriate stimulating sensation and its persistence.

The sugar alcohol may be appropriately synthesized or may be a commercially available product.
Examples of commercially available sugar alcohols include, by trade name, Sorbitol FP (sorbitol, manufactured by Bussan Food Science Co., Ltd.), Sorbitol SG (sorbitol, manufactured by Bussan Food Science Co., Ltd.), Parisienne (maltitol) (maltitol, particle size: about 200 μm, manufactured by Itochu Sugar Co., Ltd.), xylitol (xylitol, manufactured by Bussan Food Science Co., Ltd.), D-mannitol (mannitol, manufactured by Bussan Food Science Co., Ltd.), lactitol LC-0 (lactitol, manufactured by Bussan Food Science Co., Ltd.), lactitol LC-50M (lactitol, manufactured by Bussan Food Science Co., Ltd.), lactitol LC-1 (lactitol, manufactured by Bussan Food Science Co., Ltd.), and erythritol (erythritol, particle size: about 250 μm, manufactured by Jungbunzlauer International AG).

The content of the (B) component is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of a moderate irritating sensation and its duration, however, the content is preferably from 20% by mass to 70% by mass, and more preferably from 20% by mass to 50% by mass, based on the total amount of the skin cleanser composition.
It is preferable that the content of the component (B) is 20% by mass or more based on the total amount of the skin cleansing composition, since this provides a suitable irritating sensation and its persistence is good.
It is preferable that the content of the component (B) is 70 mass % or less based on the total amount of the skin cleansing composition, since this provides a suitable level of irritation.

The average primary particle size of component (B) is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 50 μm or more and 600 μm or less, and more preferably 200 μm or more and 600 μm or less.

<(C) At least one selected from polyoxyethylene hydrogenated castor oil having an HLB of less than 9 and polyoxyethylene hydrogenated castor oil fatty acid ester having an HLB of less than 9>
The component (C) is contained mainly to provide an appropriate duration of stimulating sensation and to impart dispersibility to the scrubbing agent (B).

The HLB (hydrophilic-lipophilic balance) of the component (C) is an index showing the balance between hydrophilicity and lipophilicity, and is generally calculated by the following formula:
(Formula) ... HLB = (Σ inorganic value / Σ organic value) × 10
The "Σ inorganic value / Σ organic value" is called the IOB value (Inorganic-Organic Balance), and can be calculated by integrating the "inorganic value" and "organic value" of the atoms and functional groups that constitute an organic compound such as a surfactant, based on the "inorganic value" and "organic value" set for each type of atom and functional group (see "Organic Conceptual Diagram - Basics and Applications" by Yoshio Koda, pages 11-17, Sankyo Publishing, 1984).

The component (C) is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoints of maintaining a moderate stimulating sensation, ease of use, dispersibility of the scrubbing agent (B), and lack of tightness on the skin after use of the skin cleansing composition, preferred polyoxyethylene hydrogenated castor oils having an HLB of less than 9 include PEG (polyethylene glycol)-5 hydrogenated castor oil and PEG-10 hydrogenated castor oil. Preferred polyoxyethylene hydrogenated castor oil fatty acid esters having an HLB of less than 9 include PEG-20 hydrogenated castor oil laurate and PEG-30 hydrogenated castor oil isostearate. PEG-5 hydrogenated castor oil, PEG-10 hydrogenated castor oil isostearate, PEG-15 hydrogenated castor oil isostearate, PEG-20 hydrogenated castor oil isostearate, PEG-5 hydrogenated castor oil triisostearate, PEG-10 hydrogenated castor oil triisostearate, PEG-15 hydrogenated castor oil triisostearate, PEG-20 hydrogenated castor oil triisostearate, PEG-30 hydrogenated castor oil triisostearate, PEG-40 hydrogenated castor oil triisostearate, and PEG-5 hydrogenated castor oil triisostearate are preferred.
Among these, polyoxyethylene hydrogenated castor oil fatty acid esters having an HLB of less than 9 are more preferred from the viewpoints of providing a suitable duration of irritation, ease of use, dispersibility of the (B) scrubbing agent, and lack of tightness on the skin after use of the skin cleansing composition.
These may be used alone or in combination of two or more. The numerical value written after "PEG" above is the average number of moles of ethylene oxide added.

As the component (C), a compound that is appropriately synthesized or a commercially available product may be used.
Commercially available products of the component (C) include, for example, trade names such as EMALEX RWL-120 (PEG-20 hydrogenated castor oil laurate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-105EX (PEG-5 hydrogenated castor oil isostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-110EX (PEG-10 hydrogenated castor oil isostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-115EX (PEG-15 hydrogenated castor oil isostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-120EX (PEG-20 hydrogenated castor oil isostearate, manufactured by Nippon Emulsion Co., Ltd.), and EMALEX RWIS-305 (PEG-5 hydrogenated castor oil triisostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-310 (PEG-10 hydrogenated castor oil triisostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-315 (PEG-15 hydrogenated castor oil triisostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-320 (PEG-20 hydrogenated castor oil triisostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-330 (PEG-30 hydrogenated castor oil triisostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-340 (PEG-40 hydrogenated castor oil triisostearate, manufactured by Nippon Emulsion Co., Ltd.), EMALEX RWIS-340 (PEG-5 hydrogenated castor oil triisostearate, manufactured by Nippon Emulsion Co., Ltd.) and the like.

The content of the (C) component is not particularly limited and can be appropriately selected depending on the content of the (A) component. From the viewpoints of the duration of the moderate stimulating sensation and the dispersibility of the (B) scrubbing agent, however, the content is preferably from 5% by mass to 30% by mass, and more preferably from 10% by mass to 20% by mass, based on the total amount of the skin cleanser composition.
It is preferable that the content of the component (C) is 5% by mass or more based on the total amount of the skin cleansing composition, since this leads to good durability of the moderate irritation.
When the content of the component (C) is 30 mass % or less based on the total amount of the skin cleansing composition, the dispersibility of the scrubbing agent (B) is favorable, which is preferable.

[Mass ratio (C)/(A)]
In this specification, the "mass ratio of the content of (C) to the content of (A)" may be referred to as the "mass ratio [(C)/(A)]".
The mass ratio [(C)/(A)] is not particularly limited and can be set appropriately depending on the purpose. From the viewpoints of maintaining a moderate sense of stimulation and improving usability, however, it is preferably 3.4 or more and 30 or less, and more preferably 3.7 or more and 10 or less.

<(D) Polyhydric alcohol>
The component (D) is not particularly limited and can be appropriately selected depending on the purpose, but is preferably a dihydric or higher polyhydric alcohol, and more preferably a trihydric or higher polyhydric alcohol.
Specific examples of the polyhydric alcohol (D) include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, isoprene glycol, dipropylene glycol, 1,3-butylene glycol (also known as 1,3-butanediol), 1,2-butanediol, 1,2-decanediol, glycerin (also known as 1,2,3-propanetriol), concentrated glycerin, diglycerin, triglycerin, polyglycerin, glucose, maltose, maltitol, sucrose, mannitol, sorbitol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, polyoxyethylene methyl glucoside, polyoxypropylene methyl glucoside, polyethylene glycol, etc. Among these, glycerin, diglycerin, triglycerin, polyglycerin, glucose, maltose, maltitol, sucrose, mannitol, and sorbitol are preferred.

The content of the (D) component is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 15% by mass or more and 70% by mass or less, and more preferably 30% by mass or more and 55% by mass or less, based on the total amount of the skin cleansing composition.

<(E) Water>
The skin cleansing composition of the present invention may contain (E) water, but it is preferable that it does not contain water.
When the skin cleanser composition contains water (E), the content of water (E) is 5% by mass or less based on the total amount of the skin cleanser composition. From the viewpoint of obtaining an appropriate irritating sensation, the content of water (E) is preferably 1% by mass or less based on the total amount of the skin cleanser composition.

<Other Ingredients (1)>
In addition to the component (A), the component (B), the component (C), the component (D), and the component (E), the skin cleanser composition of the present invention may contain, as necessary, other components (1) that are typically used in skin cleanser compositions and the like, within the scope of the present invention.

The other components (1) are not particularly limited and may be appropriately selected depending on the purpose. Examples of the other components (1) include moisturizers, powder components, oils that are liquid at 25°C, silicone compounds, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants other than the component (C), natural water-soluble polymers, semi-synthetic water-soluble polymers, synthetic water-soluble polymers, cationic polymers, thickening polymers, thickeners, UV absorbers, UV protection agents, vitamin compounds, sequestering agents, lower alcohols, monosaccharides, oligosaccharides, polysaccharides, amino acids, organic amines, polymer emulsions, pH adjusters, antioxidants, antioxidant assistants, preservatives, anti-inflammatory agents, skin whitening agents, activators, blood circulation promoters, antiseborrheic agents, anti-inflammatory agents, cooling agents (also known as cooling agents), bactericidal components, antiperspirant components, animal extracts, plant extracts, various extracts, pearlizing agents, and fragrances.

-Oil that is liquid at 25℃-
The oil that is liquid at 25°C is not particularly limited and can be appropriately selected depending on the purpose. Examples of the oil that is liquid at 25°C include silicone oil, fluorine-based oil, hydrocarbon oil, ether oil, ester oil, glyceride oil, higher fatty acid, higher alcohol, natural animal and vegetable oil, and semi-synthetic oil.
Among these, hydrocarbon oils, ester oils having 30 or less carbon atoms, natural animal and vegetable oils, and semi-synthetic oils are preferred, and ester oils having 30 or less carbon atoms, natural animal and vegetable oils, and semi-synthetic oils are more preferred.

Examples of the silicone oil include low-viscosity or high-viscosity organopolysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, methyltrimethicone, and dimethylsiloxane-methylphenylsiloxane copolymers, and cyclic siloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, tetramethyltetrahydrogencyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetratrifluoropropylcyclotetrasiloxane, and pentamethylpentatrifluoropropylcyclopentasiloxane.

Examples of such fluorine-based oils include perfluoropolyether, perfluorodecalin, and perfluorooctane.

Examples of the hydrocarbon oil include linear hydrocarbon oils, branched hydrocarbon oils, volatile hydrocarbon oils, etc. Specific examples include α-olefin oligomers, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, squalene, liquid paraffin, liquid isoparaffin, etc.
The hydrocarbon oil may be appropriately synthesized or may be a commercially available product. Examples of commercially available hydrocarbon oils include, by trade name, NIKKOL Synthelan 4SP (α-olefin oligomer, manufactured by Nikko Chemicals Co., Ltd.), MARUKAZOL R (light isoparaffin, manufactured by Maruzen Petrochemical Co., Ltd.), HICOL M-52 (light liquid isoparaffin, manufactured by Kaneda Co., Ltd.), HICOL M-72 (light liquid isoparaffin, manufactured by Kaneda Co., Ltd.), HICOL M-172 (light liquid isoparaffin, manufactured by Kaneda Co., Ltd.), squalane (squalane, manufactured by Kuraray Co., Ltd.), squalane (squalane, manufactured by Nikko Chemicals Co., Ltd.), sugar squalane (vegetable squalane, manufactured by Nikko Chemicals Co., Ltd.), liquid paraffin S (liquid paraffin, manufactured by Sanko Chemicals Co., Ltd.), and Palmream 24 (liquid isoparaffin, manufactured by NOF Corporation).

Examples of such ether oils include butyl glycidyl ether, 2-ethylhexyl glycidyl ether, allyl glycidyl ether, phenyl glycidyl ether, alkyl-1,3-dimethylbutyl ether, and nonylphenyl ether.

Examples of the ester oil include diisobutyl adipate, 2-hexyldecyl adipate, di-2-heptylundecyl adipate, N-alkyl glycol monoisostearate, isostearyl isostearate, isocetyl isostearate, trimethylolpropane triisostearate, isononyl isononanoate, isotridecyl isononanoate, ethylene glycol di-2-ethylhexanoate, cetyl 2-ethylhexanoate, trimethylolpropane tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, cetyl ethylhexanoate, oleyl oleate, octyldodecyl oleate, decyl oleate, neopentyl glycol dicaprate, triethyl citrate, 2-ethylhexyl succinate, amyl acetate, ethyl acetate, and acetic acid. Butyl, isocetyl stearate, butyl stearate, diisopropyl sebacate, di-2-ethylhexyl sebacate, cetyl lactate, myristyl lactate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, dipentaerythritol fatty acid esters, isopropyl myristate, octyldodecyl myristate, 2-hexyldecyl myristate, hexyldecyl dimethyloctanoate, ethyl laurate, hexyl laurate, diisostearyl malate, acetoglyceryl, glyceryl triethylhexanoate, tri(caprylic/capric acid)glyceryl, glyceryl triisostearate, glyceryl triisopalmitate, glyceryl di-2-heptylundecanoate, and the like.
The ester oil may be appropriately synthesized or may be a commercially available product. Examples of commercially available ester oils having 30 or less carbon atoms include, by trade name, KAK 99 (isononyl isononanoate, manufactured by Kokyu Alcohol Kogyo Co., Ltd.), KAK 139 (isotridecyl isononanoate, manufactured by Kokyu Alcohol Kogyo Co., Ltd.), Exepar HO (cetyl 2-ethylhexanoate, manufactured by Kao Chemical Co., Ltd.), NIKKOL SG-IOP (2-ethylhexyl palmitate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL IPM-EX (isopropyl myristate, manufactured by Nikko Chemicals Co., Ltd.), ethyl laurate (ethyl laurate, manufactured by Tokyo Chemical Industry Co., Ltd.), KAK HL (hexyl laurate, manufactured by Kokyu Alcohol Kogyo Co., Ltd.), and NIKKOL TRIFAT S-308 (glyceryl triethylhexanoate, manufactured by Nikko Chemicals Co., Ltd.).

Examples of higher fatty acids in the other component (1) include undecylenic acid, oleic acid, linoleic acid, linolenic acid, arachidonic acid, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and isostearic acid.

Examples of such higher alcohols include oleyl alcohol, isostearyl alcohol, hexyldecanol, octyldodecanol, 2-decyltetradecyl, and monooleyl glyceryl ether (selachyl alcohol).

Examples of the natural animal and vegetable oils and the semi-synthetic oils include avocado oil, almond oil, olive oil, apricot kernel oil, wheat germ oil, sesame oil, rice germ oil, rice bran oil, sasanqua oil, safflower oil, cinnamon oil, turtle oil, soybean oil, tea seed oil, camellia oil, evening primrose oil, corn oil, rapeseed oil, Japanese tung oil, germ oil, persic oil, castor oil, castor oil fatty acid methyl ester, sunflower oil, grape oil, jojoba oil, macadamia nut oil, mink oil, meadowhoo oil, cottonseed oil, peanut oil, liquid lanolin, lanolin alcohol acetate, lanolin fatty acid polyethylene glycol, and egg yolk oil.
The natural animal and vegetable oils and the semi-synthetic oils may be appropriately synthesized or commercially available products. Examples of commercially available products of the natural animal and vegetable oils and the semi-synthetic oils include avocado oil (avocado oil, manufactured by Summit Oil Mills Co., Ltd.), almond oil (almond oil, manufactured by Summit Oil Mills Co., Ltd.), refined olive oil S (olive oil, manufactured by Summit Oil Mills Co., Ltd.), NIKKOL, etc. Apricot kernel oil (Apricot kernel oil, manufactured by Nikko Chemicals Co., Ltd.), wheat germ oil (Wheat germ oil, manufactured by Summit Oil Mills Co., Ltd.), refined sesame oil (Sesame oil, manufactured by Summit Oil Mills Co., Ltd.), rice bran oil (Rice bran oil, manufactured by Oryza Oil & Fat Chemical Co., Ltd.), safflower salad oil (Safflower oil, manufactured by Summit Oil Mills Co., Ltd.), soybean oil YM (soybean oil, manufactured by Nisshin Oillio Group Co., Ltd.), tea seed oil (tea seed oil, manufactured by Summit Oil Mills Co., Ltd.), DOCNATURA (registered trademark) CJSO (Camellia oil, manufactured by DOC Japan Co., Ltd.), evening primrose oil (evening primrose oil, manufactured by Summit Oil Mills Co., Ltd.), corn germ oil (corn oil, manufactured by Nikko Chemicals Co., Ltd.), domestic rapeseed white refined oil (rapeseed oil, manufactured by Ohta Oil Mills Co., Ltd.), castor oil Marutok A (castor oil, manufactured by Ito Oil Mills Co., Ltd.), K-PON 120 (castor oil fatty acid methyl ester, manufactured by Kokura Synthetic Industries Co., Ltd.), high oleic sunflower oil (sunflower oil, manufactured by Summit Oil Mills Co., Ltd.), grapeseed oil (grape oil, manufactured by Summit Oil Mills Co., Ltd.), jojoba oil (jojoba oil, manufactured by Summit Oil Mills Co., Ltd.), macadamia nut oil (macadamia nut oil, manufactured by Summit Oil Mills Co., Ltd.), NIKKOL meadowfoam oil (meadowfoam oil, manufactured by Nikko Chemicals Co., Ltd.), cottonseed oil (cottonseed oil, manufactured by Okamura Oil Mills Co., Ltd.), and peanut oil (peanut oil, manufactured by Summit Oil Mills Co., Ltd.).

The content of the oil that is liquid at 25°C is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.05% by mass or more and 5% by mass or less, and more preferably 0.5% by mass or more and 3% by mass or less, based on the total amount of the skin cleanser composition.

-pH-
The pH of the skin cleansing composition at 25° C. is not particularly limited and may be appropriately selected depending on the purpose, but is preferably from 5.5 to 9.0, and more preferably from 6.0 to 8.0.
The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (TOA DKK Corporation, electrode type GST-5721).

-Dosage form-
The formulation of the skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose. Examples of the formulation include a semi-solid skin cleanser composition, a gel skin cleanser composition, and a liquid skin cleanser composition.
The semi-solid skin cleansing composition may be, for example, a cream type.
The gel-type skin cleansing composition may be, for example, a gel type.
The liquid skin cleansing composition may be, for example, a roll-on type or a lotion type.

-Production method-
The method for producing the skin cleansing composition is not particularly limited and may be appropriately selected depending on the purpose. For example, the skin cleansing composition may be obtained by mixing the component (A), the component (B), the component (C), the component (D), optionally the component (E), and, optionally, another component (1).

The skin cleansing composition may be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected depending on the purpose. For example, an agitator equipped with an agitating blade that exerts shear force and can mix the entire composition may be used. Examples of the agitator include a propeller mixer, a dispersing mixer, and a paddle mixer.

The skin cleansing composition of the present invention can be used by mixing the skin cleansing composition with a composition containing a large amount of water. In other words, the skin cleansing composition can be suitably used in a skin cleansing method in which the skin is cleaned with a mixture of the skin cleansing composition and a composition containing a large amount of water.
The skin cleansing composition of the present invention does not lose the irritating sensation derived from the scrubbing agent (B) even when mixed with a composition containing a large amount of water. In other words, the skin cleansing composition of the present invention maintains the irritating sensation derived from the scrubbing agent (B) even when mixed with a composition containing a large amount of water, and has excellent irritation durability. In addition, by mixing the skin cleansing composition with a composition containing a large amount of water, the density of the foam generated from the mixture is improved, and the refreshing feeling of the skin after washing is improved.
In this specification, the "skin cleansing composition" and the "composition" are different.

<Mixture>
The mixture refers to one obtained by mixing the skin cleansing composition with the water-rich composition.
In this specification, the "composition containing a large amount of water" may be simply referred to as the "composition."

The mixing ratio of the skin cleansing composition and the composition is not particularly limited and can be appropriately set depending on the purpose.
The method for producing the mixture, i.e., the method for mixing the skin cleanser composition and the composition, is not particularly limited and can be appropriately selected depending on the purpose. For example, there is a method in which the skin cleanser composition and the composition are evenly dispensed onto the hand and then mixed by rubbing them together.

<<Composition>>
The composition preferably contains a large amount of water, and may contain an anionic surfactant and other components (2) as necessary.
Here, the term "containing a large amount" is not particularly limited, but preferably means containing 40 mass % or more with respect to the total amount of the composition.

<<<Anionic surfactants>>>
The anionic surfactant contained in the composition is not particularly limited and can be appropriately selected according to the purpose, and examples thereof include higher fatty acid salts, polyoxyethylene (POE) alkyl ether sulfates, ether carboxylates, amino acid surfactants, etc. These may be used alone or in combination of two or more. Among these, higher fatty acid salts are preferred.

- Higher fatty acid salts -
The higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include laurate, myristate, palmitate, stearate, etc. These may be used alone or in combination of two or more.
The content of the higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 10% by mass or more and 20% by mass or less based on the total amount of the composition.

The salt in the higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include alkali metal salts, amine salts, and amino acid salts.
The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the alkali metal salt include sodium salts and potassium salts.
The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the amine salt include ammonium salts, monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol.
The amino acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the amino acid salt include lysine salt and arginine salt.

The higher fatty acid salt may be appropriately synthesized or may be a commercially available product.
The method for synthesizing the higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose. For example, a higher fatty acid salt obtained by a conventional method may be blended as it is, or a higher fatty acid salt may be synthesized by neutralizing a higher fatty acid with an alkali such as potassium hydroxide in a blending tank during the blending process of the composition. Specifically, potassium laurate may be prepared by neutralizing lauric acid (trade name: NAA-122, manufactured by NOF Corporation) with potassium hydroxide (trade name: liquid caustic potash, manufactured by AGC Inc.). Potassium myristate may be prepared by neutralizing myristic acid (trade name: NAA-142, manufactured by NOF Corporation) with potassium hydroxide (trade name: liquid caustic potash, manufactured by AGC Inc.). Potassium palmitate may be prepared by neutralizing palmitic acid (trade name: NAA-160, manufactured by NOF Corporation) with potassium hydroxide (trade name: liquid caustic potash, manufactured by AGC Inc.). Potassium stearate may be prepared by neutralizing stearic acid (trade name: NAA-180, manufactured by NOF Corporation) with potassium hydroxide (trade name: liquid caustic potash, manufactured by AGC Inc.).
Examples of commercially available higher fatty acid salts include, by trade name, NIKKOL potassium laurate LK-120 (potassium laurate), NIKKOL potassium myristate MK-140 (potassium myristate) (both manufactured by Nikko Chemicals Co., Ltd.), and NONSARL PK-1 (potassium palmitate) (manufactured by NOF Corporation).

-Polyoxyethylene alkyl ether sulfate-
The polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a compound represented by the following general formula (A1): The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more kinds.

In the general formula (A1), R ¹ represents an alkyl group, and the alkyl group moiety preferably has 10 to 14 carbon atoms.
In the general formula (A1), n represents the average number of moles of ethylene oxide (E.O.) added. The average number of moles of ethylene oxide added is preferably 1 to 5.
In the general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include sodium and potassium.

Specific examples of the polyoxyethylene alkyl ether sulfate include polyoxyethylene (1) sodium lauryl ether sulfate, polyoxyethylene (2) sodium lauryl ether sulfate (also known as POE (2) sodium laureth sulfate), polyoxyethylene (3) sodium lauryl ether sulfate (also known as POE (3) sodium laureth sulfate), polyoxyethylene (4) sodium lauryl ether sulfate, polyoxyethylene (5) sodium lauryl ether sulfate, polyoxyethylene (3) sodium alkyl (C12,13) ether sulfate, polyoxyethylene (2) lauryl ether ammonium sulfate, and polyoxyethylene (3) lauryl ether ammonium sulfate.
The numbers in the parentheses indicate the average number of moles (n) of ethylene oxide (E.O.) added.

The polyoxyethylene alkyl ether sulfate may be appropriately synthesized or may be a commercially available product. Examples of commercially available polyoxyethylene alkyl ether sulfates include Texapon (registered trademark) N70 (manufactured by BASF, sodium polyoxyethylene (2) lauryl ether sulfate) and Shinorin SPE-1250 (manufactured by New Japan Chemical Co., Ltd., sodium polyoxyethylene (2) lauryl ether sulfate).

-Ether carboxylate-
The ether carboxylate is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A2) or (A3): The ether carboxylate may be used alone or in combination of two or more kinds.

In the general formulae (A2) and (A3), ^R2 represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. The number of carbon atoms in the ^R2 portion is preferably 10 to 14.
In the general formula (A2), R ³ may be the same or different and represents an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms.
In the general formula (A2), o represents the average number of moles of alkylene oxide added, which is 1 to 20. The average number of moles of alkylene oxide added is preferably 1 to 5.
In the general formulae (A2) and (A3), M ¹ represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

Specific examples of the ether carboxylate represented by the general formula (A2) or (A3) include polyoxyethylene (3) sodium lauryl ether acetate, polyoxyethylene (4) potassium lauryl ether acetate, and sodium lauryl glycol acetate.
The numbers in the parentheses indicate the average number of moles of alkylene oxide added.

The ether carboxylate may be appropriately synthesized or a commercially available product. Examples of commercially available ether carboxylates include, by trade name, ENERGICOL EC-30 (manufactured by Lion Specialty Chemicals Co., Ltd., polyoxyethylene (3) lauryl ether sodium acetate), VIEWRITE LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), VIEWRITE LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), VIEWRITE LCA-H (polyoxyethylene (4) lauryl ether acetic acid), VIEWRITE LCA-25NH (laureth-4 carboxylic acid), VIEWRITE SHAA (sodium lauryl glycol carboxylate), VIEWRITE LCA (polyoxyethylene (3) lauryl ether sodium acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), Kao Akipo RLM-45NV (polyoxyethylene (4.5) lauryl ether sodium acetate), and Kao Akipo RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (all manufactured by Kao Corporation).
The numbers in the parentheses indicate the average number of moles of alkylene oxide added.

- Amino acid-based surfactants -
The amino acid surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A4): The amino acid surfactant may be used alone or in combination of two or more kinds.

In the general formula (A4), ^R4 represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. The number of carbon atoms in the ^R4 portion is preferably 8 to 18.
In the general formula (A4), R ⁵ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.
In the general formula (A4), R ⁶ and R ⁷ may be the same or different and each represents a hydrogen atom or —(CH ₂ ) _m ^—COOM3 .
In the general formula (A4), m and n may be the same or different and represent a number from 0 to 20.
In the general formula (A4), M ² and M ³ may be the same or different and each represent a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

The amino acid structure of the hydrophilic portion of the amino acid surfactant is not particularly limited and can be selected appropriately depending on the purpose, but glycine, glutamic acid, and methylalanine are preferred.

Specific examples of amino acid surfactants represented by the general formula (A4) include N-acyl-glycine and its salts, such as N-cocoyl-glycine potassium (N-coconut oil fatty acid acylglycine potassium); N-acyl-N-carboxyethyl-glycine and its salts, such as N-myristoyl-N-carboxyethyl-glycine sodium; N-acylglutamic acid and its salts, such as N-myristoyl-L-glutamate sodium, N-myristoyl-L-glutamate potassium, N-coconut oil fatty acid acyl-L-glutamate potassium, N-palm fatty acid acyl-L-glutamate sodium, and N-stearoyl-L-glutamate sodium; and N-lauroyl-N-methyl-β-alanine potassium.

The amino acid surfactant may be appropriately synthesized or may be a commercially available product. Commercially available amino acid surfactants include, for example, Amirite (registered trademark) GCK-11 (potassium N-coconut oil fatty acid acylglycine), Amirite (registered trademark) GCK-12K (potassium N-coconut oil fatty acid acylglycine), Amirite (registered trademark) GCS-12K (sodium N-coconut oil fatty acid acylglycine), Amirite (registered trademark) GCS-11 (sodium N-coconut oil fatty acid acylglycine), Amisoft (registered trademark) CS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-coconut oil fatty acid acyl-L-glutamate), Amisoft (registered trademark) LS-11 (sodium N-lauroyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-coconut oil fatty acid acyl-L-glutamate), Amisoft (registered trademark) LS-22 (sodium N-lauro ... sodium glutamate), Amisoft (registered trademark) MS-11 (N-myristoyl-L-sodium glutamate), Amisoft (registered trademark) HS-11P (N-stearoyl-L-sodium glutamate), Amisoft (registered trademark) HS-11P(F) (N-stearoyl-L-sodium glutamate), Amisoft (registered trademark) HS21 (N-stearoyl-L-disodium glutamate), Amirite (registered trademark) ACS-12 (sodium cocoyl alanine) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), Aminosurfact (registered trademark) AMMS-P1 (N-myristoyl-L-sodium glutamate) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Examples include Sarcosinate MN (sodium myristoyl methylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroyl methyl-β-alanine) (all manufactured by Nikko Chemicals Co., Ltd.), Alanon ACE (sodium coconut oil methylalanine), Alanon AME (sodium myristoyl methyl-β-alanine), Alanon ALE (sodium lauroyl methyl-β-alanine) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Energicole L-30AN (sodium lauroyl methyl-β-alanine) (manufactured by Lion Specialty Chemicals Co., Ltd.), and Softilt AT-L (sodium lauroyl methyl-β-alanine) (manufactured by NOF Corporation).

-Other ingredients (2)-
The other component (2) is not particularly limited and can be appropriately selected depending on the purpose. Examples of the other component (2) include surfactants other than the anionic surfactants, water-soluble solvents, water-soluble polymers, chelating agents, pH adjusters, foam quality improvers, water-soluble polymers, oils, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, bactericides, moisturizers, preservatives, antioxidants, ultraviolet absorbers, ultraviolet scattering agents, amino acids, pharmaceutical agents such as vitamins, animal and plant extracts or derivatives thereof, colorants, fragrances, pigments, inorganic powders, clay minerals, and water-insoluble polymer compound powders.
These may be used alone or in combination of two or more.
The other components may be appropriately synthesized or commercially available products.
The content of the other components in the composition is not particularly limited and can be appropriately selected depending on the purpose.

--Surfactants other than the above anionic surfactants--
The surfactant other than the anionic surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include nonionic surfactants, cationic surfactants, amphoteric surfactants, etc. These may be used alone or in combination of two or more kinds.

The nonionic surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples of the nonionic surfactant include sorbitan fatty acid esters, glycerin fatty acid esters, alkylene oxide adducts of sorbitan fatty acid esters, alkylene oxide adducts of glycerin fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene alkylphenols, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene alkylphenyl formaldehyde condensates, polyoxyethylene sterols and derivatives thereof, polyoxyethylene lanolin and derivatives thereof, polyoxyethylene beeswax derivatives, sugar esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene castor oil, etc.

The cationic surfactant is not particularly limited and can be appropriately selected according to the purpose. Examples include alkyl trimethyl ammonium salts such as stearyl trimethyl ammonium chloride and lauryl trimethyl ammonium chloride, alkyl pyridinium salts such as cetyl pyridinium chloride, distearyl dimethyl ammonium chloride dialkyl dimethyl ammonium salts, poly(N,N'-dimethyl-3,5-methylene piperidinium chloride), alkyl quaternary ammonium salts, alkyl dimethyl benzyl ammonium salts, alkyl isoquinolinium salts, dialkyl morphonium salts, POE-alkyl amines, alkyl amine salts, polyamine fatty acid derivatives, amyl alcohol fatty acid derivatives, benzalkonium chloride, and benzethonium chloride.

The amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include betaine-type amphoteric surfactants and amino acid-type amphoteric surfactants.

The betaine type amphoteric surfactant is not particularly limited and can be appropriately selected according to the purpose. Examples of the betaine type amphoteric surfactant include alkyl betaine type amphoteric surfactants such as lauryl dimethylamino acetate betaine, coconut oil alkyl betaine, and stearyl dimethylamino acetate betaine; amido betaine type amphoteric surfactants such as lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, and palm kernel oil fatty acid amidopropyl betaine; sulfobetaine type amphoteric surfactants such as lauryl hydroxysulfobetaine, lauramidopropyl hydroxysultaine, coconut oil fatty acid dimethylamino hydroxysulfobetaine, and lauryl dimethylamino hydroxysulfobetaine; and imidazolinium betaine type amphoteric surfactants such as N-lauroyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine sodium, N-coconut oil fatty acid acyl-N'-carboxymethyl-N'-hydroxyethyl ethylenediamine sodium, and 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine.

The amino acid type amphoteric surfactant is not particularly limited and can be appropriately selected according to the purpose. Examples include sodium β-lauryl aminopropionate, sodium lauryl aminodipropionate, sodium N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine, sodium coconut oil alkylaminopropionate, N-lauryl β-alanine, and N-stearyl β-alanine.

The content of the surfactant other than the anionic surfactant is not particularly limited and can be appropriately selected according to the purpose, so long as it does not impair the effects of the present invention.

--Water-soluble solvent--
The water-soluble solvent is not particularly limited and can be appropriately selected depending on the purpose. Examples of the water-soluble solvent include glycerin, sorbitol, propylene glycol, and 1,3-butylene glycol.
The content of the water-soluble solvent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 5% by mass or more and 20% by mass or less based on the total amount of the composition.

--Water-soluble polymers--
The water-soluble polymer is not particularly limited and can be appropriately selected depending on the purpose. Examples of the water-soluble polymer include cationic polymers such as polydimethyldimethylenepyrrolidinium chloride and methyldiallylammonium chloride-acrylamide copolymer.
The content of the water-soluble polymer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.5% by mass or more and 5% by mass or less based on the total amount of the composition.

--Chelating agent--
The chelating agent is not particularly limited and can be appropriately selected depending on the purpose. Examples of the chelating agent include edetic acid, edetate disodium, ethylenediaminetetraacetate, hexametaphosphate, and gluconic acid.
The content of the chelating agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.02% by mass or more and 1% by mass or less based on the total amount of the composition.

--pH adjuster--
The pH adjuster is not particularly limited and can be appropriately selected depending on the purpose. Examples of the pH adjuster include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, monoethanolamine, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, and glycolic acid.

--Foam quality improver--
The foam quality improver is not particularly limited and may be appropriately selected depending on the purpose. Examples of the foam quality improver include potassium dihydrogen phosphate.
The content of the foam quality improver is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.5% by mass or more and 5% by mass or less based on the total amount of the composition.

--Stabilizer--
The stabilizer is not particularly limited and can be appropriately selected depending on the purpose. For example, polyethylene glycol 400 is included.
The content of the stabilizer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.5% by mass or more and 10% by mass or less based on the total amount of the composition.

--Oil content--
The oil is not particularly limited and can be appropriately selected depending on the purpose. Examples of the oil include vegetable oils and fats such as castor oil, olive oil, cacao oil, hardened palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, avocado oil, and ester compounds thereof; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate.
The content of the oil is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 0.1% by mass or more and 5% by mass or less based on the total amount of the composition.

--Alcohols--
The alcohols are not particularly limited and can be appropriately selected depending on the purpose. Examples of the alcohols include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol.
The content of the alcohol is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% by mass or more and 5% by mass or less based on the total amount of the composition.

--Moisturizer--
The moisturizing agent is not particularly limited and can be appropriately selected depending on the purpose. Examples of the moisturizing agent include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 EO), diglycerin, triglycerin, and polyglycerins.
The content of the moisturizing agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% by mass or more and 20% by mass or less based on the total amount of the composition.

--Preservative--
The preservative is not particularly limited and can be appropriately selected depending on the purpose. Examples of the preservative include benzoates, sorbates, dehydroacetates, paraoxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcin, methylchloroisothiazolinone-methylisothiazolinone solution (product name: Cason CG, manufactured by Rohm and Haas Japan), pentanediol, phenoxyethanol, and ethanol.

--Antioxidant--
The antioxidant is not particularly limited and can be appropriately selected depending on the purpose. Examples of the antioxidant include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid.
The content of the antioxidant is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 1 mass % or less based on the total amount of the composition.

--Ultraviolet absorbing agent and ultraviolet scattering agent--
The ultraviolet absorbing agent and the ultraviolet scattering agent are not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl paraaminobenzoate, ethylhexyl paramethoxycyanamate, titanium oxide, kaolin, and talc.
The content of the ultraviolet absorbing agent and the ultraviolet scattering agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 1 mass % or less based on the total amount of the composition.

--Vitamins--
The vitamins are not particularly limited and can be appropriately selected depending on the purpose. Examples of the vitamins include vitamin A, B vitamins, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid, and derivatives thereof.
The content of the vitamins is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 1% by mass or less based on the total amount of the composition.

--Amino acids--
The amino acids are not particularly limited and can be appropriately selected depending on the purpose. Examples of the amino acids include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and derivatives thereof.
The content of the amino acids is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 5% by mass or less based on the total amount of the composition.

--Water-insoluble polymer compound powder--
The water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose. Examples of the water-insoluble polymer compound powder include nylon and polyethylene.
The content of the water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 5% by mass or less based on the total amount of the composition.

The composition may be filled in a former container and discharged in the form of a foam. The former container is not particularly limited and may be appropriately selected depending on the purpose as long as it can discharge the composition in the form of a foam. Examples of the former container include a non-gas type foam dispenser and an aerosol container using a propellant and a pressure-resistant container. Among these, a non-gas type foam dispenser is preferred.

-Non-gas type foam dispenser-
The non-gas type foam dispenser is not particularly limited as long as it can mix the composition with air and dispense it in a foamed state, and can be appropriately selected depending on the purpose. Examples of the foam dispenser include a squeeze foamer container that can dispense foam by squeezing the bottle body by hand, and a pump foamer container that can dispense foam by pressing down on the nozzle.
As the squeeze former container and the pump former container, for example, a former container manufactured by Yamato Can Co., Ltd., a former container manufactured by Yoshino Kogyosho Co., Ltd., etc. can be used. More specifically, the former containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972, etc. can be used.

The non-gas type foam dispenser generally has a porous membrane for forming foam, and foam is formed by the composition passing through the porous membrane.
The material of the porous membrane is not particularly limited and can be appropriately selected depending on the purpose, but plastic materials such as nylon, polyester, polyolefin, etc. are preferred.

The mesh of the porous membrane body is not particularly limited and can be appropriately selected depending on the purpose. For example, it is preferably 100 mesh or more, more preferably 100 mesh or more and 400 mesh or less, and even more preferably 200 mesh or more and 350 mesh or less.
The number of the porous membrane bodies is not particularly limited and can be appropriately selected according to the purpose, but from the viewpoint of improving foam performance, 2 to 4 sheets are preferable. More specifically, the foamer containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972 can be preferably used. For example, when the composition is used using the pump foamer container having one 350 mesh porous membrane body and one 200 mesh porous membrane body, the viscosity of the composition under the temperature conditions actually used is preferably 30 mPa·s or less, more preferably 25 mPa·s or less.

The method for producing the composition is not particularly limited and can be appropriately selected depending on the purpose. For example, the composition can be obtained by mixing water, an anionic surfactant, and other components (2).

--Applications--
The area where the skin cleansing composition is applied is not particularly limited and can be appropriately selected depending on the purpose. For example, the skin cleansing composition can be applied to the whole body, face, hands, etc.
The skin cleanser composition has excellent dispersibility of the scrubbing agent, excellent in terms of irritation, ease of use, and lack of tightness on the skin after use, and also has excellent persistence of irritation even when mixed with a composition containing a large amount of water, and therefore can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, cleansing foams, makeup removers, and the like.

The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. The content of each component described in the examples and comparative examples is shown in "mass %", the total amount is 100 mass %, and all values are converted to pure content.

(Examples 1 to 27 and Comparative Examples 1 to 13)
Each skin cleansing composition having the composition and content shown in Tables 2 to 9 was prepared according to the following method. Specifically, each skin cleansing composition was obtained by mixing the component (A), the component (B), the component (C), the component (D), the component (E), and other component (1) at 90°C.
The components were mixed using a propeller as a stirring blade and a Three-One Motor (HEIDON BL1200, manufactured by Shinto Chemical Industry Co., Ltd.).

The following items were evaluated and judged for each of the obtained skin cleansing compositions. The results are shown in Tables 2 to 9.

<Evaluation and judgment of moderate irritation>
Ten expert evaluators wetted the inside of the left forearm with water. 2.0 g of each skin cleansing composition was placed on the palm of the right hand, and the composition was rubbed back and forth on the skin 10 times. The "moderate irritation" was evaluated based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators, and judged based on the following evaluation criteria for the average score.
-Evaluation criteria-
4 points: Moderate stimulation 3 points: Slightly strong stimulation 2 points: Strong stimulation that causes pain, or little stimulation 1 point: Very strong stimulation that causes pain, or no stimulation at all - Evaluation criteria -
◎: 3.5 points or more ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

<Evaluation and assessment of duration of stimulation>
The inner side of the left forearm of five expert evaluators was wetted with water. 2.0 g of each skin cleansing composition and 3.0 g of the foam body soap were placed on the palm of the right hand, mixed, and passed back and forth over the skin to evaluate and judge "stimulation duration". The results were calculated by calculating the average score of the five expert evaluators and judged based on the following criteria for judging the average score. The "foam body soap" corresponds to the above-mentioned composition and was produced by mixing the components shown in Table 1 below. The pH was measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (TOA DKK Corporation, electrode type GST-5721).
-Evaluation criteria-
4 points: Roughness (irritation) is still felt even after 20 back and forth strokes. 3 points: Roughness (irritation) disappears after 15 to 20 back and forth strokes. 2 points: Roughness (irritation) disappears after 5 to 15 back and forth strokes. 1 point: Roughness (irritation) disappears after less than 5 back and forth strokes. - Evaluation criteria -
◎: 3.5 points or more ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

Details of each component in Table 1 are shown below.
Potassium laurate (product name: Nonsal LK-2, manufactured by NOF Corporation)
Potassium myristate (product name: Nonsal MK-1, manufactured by NOF Corporation)
Potassium hydroxide (48% solution) (product name: liquid caustic potash, manufactured by AGC Corporation)
- Monoethanolamine (product name: Monoethanolamine, manufactured by Nippon Shokubai Co., Ltd.)
Lauryl amide propyl betaine (product name: Energical L-30B, manufactured by Lion Specialty Chemicals Co., Ltd.)
Polydimethyldimethylenepyrrolidinium chloride (product name: Mercoat 100, manufactured by Lubrizol Japan, Ltd.)
Propylene glycol (product name: cosmetic propylene glycol, manufactured by ADEKA Corporation)
・Glycerin (product name: 85% glycerin for cosmetics, manufactured by Sakamoto Pharmaceutical Co., Ltd.)
Fragrance (appropriately selected from fragrances A to D described in paragraphs [0065] to [0071] of JP 2002-128658 A, fragrances A to E described in paragraphs [0076] to [0088] of JP 2003-73249 A, or blended fragrance compositions 1 to 4 described in paragraphs [0016] to [0023] of JP 2020-132680 A)
・Purified water (product name: Purified Water, manufactured by Kosakai Pharmaceutical Co., Ltd.)

<Evaluation and judgment of dispersibility of scrubbing agent>
Five expert evaluators discharged 3.0 g of each different skin cleansing composition onto a 20 x 20 cm transparent glass plate, spread it evenly with their fingertips, and visually observed and evaluated and judged the "dispersibility." The results were calculated by calculating the average score of the five expert evaluators and judging based on the following criteria for judging the average score.
-Evaluation criteria-
4 points: The formulation spreads evenly and there is no uneven distribution of the scrubbing agent. 3 points: The formulation spreads evenly, but there is slight uneven distribution of the scrubbing agent. 2 points: The formulation spreads evenly, but there is a lot of uneven distribution of the scrubbing agent. 1 point: The formulation cannot be spread evenly due to uneven distribution of the scrubbing agent. - Evaluation criteria -
◎: 3.5 points or more ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

<Evaluation and judgment of usability>
The left forearm of each of five expert evaluators was wetted with water. 2.0 g of each skin cleansing composition was placed on the palm of the right hand, and the composition was rubbed back and forth on the skin 10 times to evaluate and judge the "usability". The results were calculated by calculating the average score of the five expert evaluators, and judged based on the following criteria for judging the average score.
-Evaluation criteria-
3 points: Easy to spread 2 points: Spreadable, but slightly sticky 1 point: Difficult to spread - Evaluation criteria -
◎: 2.5 points or more ○: 2.0 points or more and less than 2.5 points ×: Less than 2.0 points

<Evaluation and assessment of skin tightness after use of skin cleansing composition>
The inner side of the left forearm of five expert evaluators was wetted with water. 2.0 g of each skin cleansing composition was placed on the palm of the right hand and moved back and forth on the skin 10 times. The applied area was rinsed with warm water at 40°C, towel-dried, and then left to rest for 30 minutes in a thermostatic room at 28°C, and the "tight feeling of the skin after use" was evaluated and judged. The results were calculated by calculating the average score of the five expert evaluators, and judged based on the following criteria for judging the average score.
-Evaluation criteria-
◎: No feeling of skin tension ○: A slight feeling of skin tension is felt, but tolerable ×: A strong feeling of skin tension is felt - Evaluation criteria -
◎: 2.5 points or more ○: 2.0 points or more and less than 2.5 points ×: Less than 2.0 points

Details of each component used in Examples 1 to 27 and Comparative Examples 1 to 13 are shown in Table 10 below.

The skin cleansing composition has excellent dispersibility of the scrubbing agent, excellent irritation, ease of use, and no tight feeling on the skin after use. It also has excellent irritation durability even when mixed with a composition containing a large amount of water, so it can be used, for example, in body shampoos, body soaps, facial cleansers, hand soaps, cleansing foams, makeup removers, etc.

Claims (3)

(A) an oil that is solid at 25°C;
(B) at least one water-soluble scrubbing agent selected from sugars and sugar alcohols;
(C) at least one selected from polyoxyethylene hydrogenated castor oil having an HLB of less than 9 and polyoxyethylene hydrogenated castor oil fatty acid ester having an HLB of less than 9;
(D) a polyhydric alcohol,
The skin cleanser composition, when it contains (E) water, the content of the (E) water is 5 mass% or less based on the total amount of the skin cleanser composition. The skin cleansing composition according to claim 1, wherein the mass ratio of the content of (C) to the content of (A) [(C)/(A)] is 3.4 or more and 30 or less. The content of the (A) is 0.5% by mass or more and 7% by mass or less based on the total amount of the skin cleanser composition,
The content of the (B) is 20% by mass or more and 70% by mass or less based on the total amount of the skin cleanser composition,
The skin cleanser composition according to claim 1 , wherein the content of (C) is from 5% by mass to 30% by mass, based on the total amount of the skin cleanser composition.