Liquid skin cleanser composition

Abstract

To provide a skin detergent composition having high bactericidal activity against coliform bacillus or the like having pathogenicity while holding indigenous bacteria enhancing a barrier function on skin, having no coloration and satisfactory liquid appearance, no disgusting odor, excellent foam quality and touch after cleansing, no irritation onto hand skin, and excellent stability.SOLUTION: A skin detergent composition contains (A) anionic surfactant, (B) at least one kind of plant extract selected from Sasa kurilensis extract and water extract of mint, and (C) at least one kind of polyhydric alcohol selected from glycerol, 1,3-butylene glycol and propylene glycol. A mass ratio [(C) / (B)] between the content of the component (B) and the content of the component (C) is 3 to 30.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Skin cleanser compositions used for washing hands are required to have not only excellent foam quality, post-cleaning feel, non-irritation to the skin, and stability, but also high bactericidal activity, and synthetic chemical substances have traditionally been used as bactericidal ingredients (see, for example, Patent Documents 1 and 2). However, the formulation conditions and amounts of these synthetic chemical substances are generally determined from the standpoints of safety and skin irritation. Furthermore, because these synthetic chemical substances also kill resident bacteria that enhance the barrier function of the skin, repeated washing with a skin cleanser composition with high bactericidal activity has the problem of causing rough and dry skin on the hands.

[0003] Therefore, there is a demand for plant-derived antibacterial ingredients that are gentle on the skin. However, extracts obtained by common plant extraction methods, such as extraction with organic solvents such as alcohol and extraction with acid or alkali treatment, suffer from decomposition or aggregation of the active ingredients, resulting in coloration and a distinctive unpleasant taste and odor, which limits the conditions for incorporation into cosmetics such as skin cleanser compositions. Furthermore, these plant extracts have low bactericidal activity, and even when incorporated into skin cleanser compositions, they do not have the same bactericidal activity as synthetic chemicals.

[0004] Therefore, there is a strong demand for a skin cleanser composition that has high bactericidal activity against pathogenic Escherichia coli and the like while preserving normal flora that enhance the barrier function of the skin, is colorless, has a good liquid appearance, is free from unpleasant taste and odor, has excellent foam quality, feeling after cleansing, is non-irritating to the skin, and is stable. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2011 / 043226 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-182698 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention aims to solve the above-mentioned problems of the prior art and to achieve the following objectives: Namely, the present invention aims to provide a skin cleanser composition that has high bactericidal activity against pathogenic bacteria such as Escherichia coli while preserving normal resident bacteria that enhance the skin's barrier function, is colorless, has a good liquid appearance, is free from unpleasant taste and odor, and is excellent in foam quality, feel after cleansing, non-irritation to the skin, and stability. [Means for solving the problem]

[0007] As a result of intensive research to achieve the above-mentioned object, the inventors have found that a skin cleanser composition comprising (A) an anionic surfactant, (B) at least one plant extract selected from a Sasa kurilensis extract and an aqueous extract of peppermint, and (C) at least one polyhydric alcohol selected from glycerin, 1,3-butylene glycol, and propylene glycol, and having a mass ratio [(C) / (B)] of the content of the component (C) to the content of the component (B) of 3 to 30, exhibits high bactericidal activity against pathogenic Escherichia coli and the like while maintaining normal resident bacteria that enhance the barrier function of the skin, is free from coloration, has a good liquid appearance, is free from an unpleasant taste and odor, and is excellent in foam quality, feel after cleansing, non-irritation to the skin, and stability.

[0008] 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 anionic surfactant; (B) at least one plant extract selected from a Sasa kurilensis extract and a water extract of mint; (C) at least one polyhydric alcohol selected from glycerin, 1,3-butylene glycol, and propylene glycol; and the mass ratio of the content of the component (C) to the content of the component (B) [(C) / (B)] is 3 to 30. <2> The above-mentioned composition, wherein the (B) component of the extract of Sasa kurilensis is Sasa kurilensis water, and the (B) component of the water extract of mint is mint oil. <1> The skin cleansing composition according to claim 1. <3> The content of the component (A) is 5% by mass to 12% by mass, The content of the Sasa kurilensis extract of the component (B) is 0.5% by mass to 1.2% by mass, and the content of the peppermint water extract of the component (B) is 0.2% by mass to 0.5% by mass, The above composition, in which the component (C) is 5% by mass to 10% by mass. <1> from <2> The skin cleanser composition according to any one of the preceding claims. <4> (D) The above composition further containing an amphoteric surfactant <1> from <3> The skin cleanser composition according to any one of the preceding claims. <5> The content of the component (D) is 0.5% by mass to 4% by mass. <4> The skin cleansing composition according to claim 1. [Effects of the Invention]

[0009] According to the present invention, the above-mentioned conventional problems can be solved and the above-mentioned object can be achieved, and a skin cleanser composition can be provided which has high bactericidal activity against pathogenic Escherichia coli and the like while retaining the resident bacteria that enhance the barrier function of the skin, is free from coloration and has a good liquid appearance, is free from an unpleasant taste or odor, and is excellent in foam quality, feel after cleansing, non-irritation to the skin, and stability. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Skin cleanser composition) The skin cleanser composition of the present invention contains (A) an anionic surfactant, (B) at least one plant extract selected from a Sasa kurilensis extract and an aqueous extract of peppermint, and (C) at least one polyhydric alcohol selected from glycerin, 1,3-butylene glycol, and propylene glycol, and preferably further contains (D) an amphoteric surfactant, and may further contain other ingredients as necessary.

[0011] <(A) Anionic Surfactant> The anionic surfactant as component (A) is contained mainly to improve foam quality, feel after washing, and bactericidal activity against Escherichia coli.

[0012] The anionic surfactant of component (A) is not particularly limited and can be appropriately selected depending on the purpose. Examples 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 in terms of foam quality, feel after washing, and bactericidal activity against Escherichia coli.

[0013] -Higher fatty acid salts- The higher fatty acid salt in component (A) 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. Among these, higher fatty acid salts containing both laurate and myristate are preferred.

[0014] The counter ion of 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 thereof include sodium salts and potassium salts. The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof 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 thereof include lysine salt and arginine salt. Among these, alkali metal salts are preferred, and potassium salts are particularly preferred, in that they provide excellent foam elasticity.

[0015] The higher fatty acid salt may be suitably synthesized or may be a commercially available product. 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), and TYSOAP MNK-40 (liquid blend of potassium coconut oil fatty acid and potassium myristate (all manufactured by Nikko Chemicals Co., Ltd.)).

[0016] The higher fatty acid salt can be blended as a higher fatty acid salt, but a higher fatty acid and a salt serving as the counter ion, such as potassium hydroxide, may be added separately to a blending tank and subjected to a neutralization reaction to form the higher fatty acid salt.

[0017] The higher fatty acid used for preparing the higher fatty acid salt may be an appropriately synthesized product or a commercially available product. Examples of commercially available higher fatty acids include, by trade name, NAA (registered trademark)-122 (lauric acid), NAA (registered trademark)-142 (myristic acid), NAA (registered trademark)-160 (palmitic acid), and NAA (registered trademark)-180 (stearic acid) (all manufactured by NOF Corporation), Kortacid 1299 (lauric acid), and Kortacid 1499 (myristic acid) (all manufactured by Pacific Oleochemicals).

[0018] The content of the laurate salt is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 2% by mass to 12% by mass, more preferably 4% by mass to 10% by mass, based on the total amount of the skin cleanser composition.

[0019] The content of the myristate salt is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.5% by mass to 10% by mass, and more preferably 1% by mass to 8% by mass, based on the total amount of the skin cleanser composition.

[0020] The content of the palmitate is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 1% by mass to 11% by mass, and more preferably 3% by mass to 9% by mass, relative to the total amount of the skin cleanser composition.

[0021] The content of the stearate is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.1% by mass to 3% by mass, and more preferably 0.2% by mass to 1% by mass, relative to the total amount of the skin cleanser composition.

[0022] -Polyoxyethylene alkyl ether sulfate- The polyoxyethylene alkyl ether sulfate in the component (A) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A1): The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more types. [ka]

[0023] In the general formula (A1), R 1 represents an alkyl group, and the alkyl group moiety preferably has 10 to 14 carbon atoms.

[0024] In the general formula (A1), n ​​represents the average number of moles of ethylene oxide (EO) added, and the average number of moles of ethylene oxide added is preferably 1 to 5.

[0025] 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. Examples thereof include sodium and potassium.

[0026] Specific examples of the polyoxyethylene alkyl ether sulfates 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 value in the parentheses indicates the average number of moles (n) of ethylene oxide (EO) added.

[0027] The polyoxyethylene alkyl ether sulfate may be suitably synthesized or may be a commercially available product. Commercially available polyoxyethylene alkyl ether sulfates include, for example, EMALE 20C (polyoxyethylene (3) lauryl ether sodium sulfate), EMALE 270J (polyoxyethylene (2) lauryl ether sodium sulfate), EMALE 20CM (polyoxyethylene (3) alkyl (C12,13) ​​ether sodium sulfate), EMALE 125HP (polyoxyethylene (1) lauryl ether sodium sulfate) (all manufactured by Kao Corporation), ALSCOP (registered trademark) DA-330S (polyoxyethylene (3) alkyl (C 12,13) ​​ether sodium sulfate), Arscope (registered trademark) A-225B (polyoxyethylene (2) lauryl ether ammonium sulfate) (all manufactured by Toho Chemical Industry Co., Ltd.), Shinorine SPE-1150 (polyoxyethylene (1) lauryl ether sodium sulfate), Shinorine SPE-1250 (polyoxyethylene (2) lauryl ether sodium sulfate), Shinorine SPE-1350 (polyoxyethylene (3) lauryl ether sodium sulfate) (all manufactured by New Japan Chemical Co., Ltd.), Texapon (registered trademark) N70 (polyoxyethylene (2) lauryl ether sodium sulfate) (manufactured by BASF).

[0028] -Ether carboxylate- The ether carboxylate salt in the component (A) 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 salt may be used alone or in combination of two or more. [ka]

[0029] In the general formulas (A2) and (A3), R 2 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, and 2 The moiety preferably has 10 to 14 carbon atoms.

[0030] In the general formula (A2), R 3 represents an alkylene group having 2 to 4 carbon atoms, and the R 3 The number of carbon atoms in the R moiety is preferably 2. 3 may be the same or different.

[0031] In the general formula (A2), o represents an average number of moles of alkylene oxide added of 1 to 20, and the average number of moles of alkylene oxide added is preferably 1 to 5.

[0032] In the general formulas (A2) and (A3), M 1 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

[0033] Specific examples of the ether carboxylate salt represented by the general formula (A2) or (A3) include polyoxyethylene (3) lauryl ether sodium acetate, polyoxyethylene (4) lauryl ether potassium acetate, and sodium lauryl glycol acetate. The numerical value in the parentheses indicates the average number of moles (o) of alkylene oxide added.

[0034] The ether carboxylate may be an appropriately synthesized product or a commercially available product. Commercially available examples of the ether carboxylate include Energicol EC-30 (polyoxyethylene (3) lauryl ether sodium acetate, manufactured by Lion Specialty Chemicals Co., Ltd.), Viewlite LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-H (polyoxyethylene (4) lauryl ether acetic acid), Viewlite LCA-25NH (laureth-4 carboxylic acid), Viewlite SHAA (sodium lauryl glycol carboxylate), Viewlite 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 numerical value in the parentheses indicates the average number of moles (o) of alkylene oxide added.

[0035] -Amino acid surfactant- The amino acid surfactant in the component (A) 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 surfactants may be used alone or in combination of two or more. [ka]

[0036] In the general formula (A4), R 4 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, and 4 The carbon number of the moiety is preferably 8 to 18.

[0037] In the general formula (A4), R 5represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

[0038] In the general formula (A4), R 6 and R 7 is a hydrogen atom or -(CH2) m -COOM 2 The above R 6 and the above R 7 may be the same or different.

[0039] In the general formula (A4), m and n represent numbers of 0 to 20. The m and n may be the same or different.

[0040] In the general formula (A4), M 1 and M 2 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid. 1 and the above M 2 may be the same or different.

[0041] The amino acid structure of the hydrophilic portion of the amino acid surfactant is not particularly limited and can be appropriately selected depending on the purpose, but glycine, glutamic acid, and methylalanine are preferred.

[0042] Specific examples of the amino acid surfactant represented by the general formula (A4) include N-acylglycines and salts thereof, such as potassium N-cocoylglycine (potassium N-cocoylglycine) and sodium N-cocoylglycine (sodium N-cocoylglycine); N-acyl-N-carboxyethyl-glycines and salts thereof, such as sodium N-myristoyl-N-carboxyethylglycine; sodium N-myristoyl-L-glutamate, sodium N-lauroyl-L-glutamate, potassium N-myristoyl-L-glutamate, potassium N-cocoyl acyl-L-glutamate, sodium N-cocoyl acyl-L-glutamate, and N-palm fatty acyl- Examples include N-acyl glutamic acids and salts thereof, such as sodium L-glutamate and sodium N-stearoyl-L-glutamate; N-acyl-N-methyl-β-alanines and salts thereof, such as potassium N-lauroyl-N-methyl-β-alanine, sodium lauroylmethyl-β-alanine, N-lauroyl-N-methyl-β-alanine triethanolamine, sodium coconut oil fatty acid methylalanine, and N-coconut oil fatty acid acyl-DL-alanine triethanolamine; N-acyl-β-alanines and salts thereof, such as N-cocoyl-β-alanine triethanolamine; and acyl sarcosines and salts thereof, such as coconut oil fatty acid sarcosine triethanolamine and sodium myristoyl methylaminoacetate.

[0043] The amino acid-based surfactant may be suitably 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), and Amisoft (registered trademark) CS-22 (sodium N-coconut oil fatty acid acyl-L-glutamate). sodium glutamate), Amisoft® MS-11 (N-myristoyl-L-glutamate sodium), Amisoft® HS-11P (N-stearoyl-L-glutamate sodium), Amisoft® HS-11P(F) (N-stearoyl-L-glutamate sodium), Amisoft® HS21 (N-stearoyl-L-glutamate disodium), Amirite® ACS-12 (cocoylalanine sodium) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), AminoSurfact® AMMS-P1 (N-myristoyl-L-glutamate sodium) (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 fatty acid methylalanine), Alanon AME (sodium myristoyl methyl-β-alanine), Alanon ALE (sodium lauroyl methyl-β-alanine) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Energicol 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).

[0044] The content of the anionic surfactant of the component (A) is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoints of foam quality, feel after washing, and bactericidal activity against E. coli, it is preferably 3 to 14% by mass, and more preferably 5 to 12% by mass, relative to the total amount of the skin cleanser composition. When the content of the component (A) is 3% by mass or more, the foam quality, feel after washing, and bactericidal activity against E. coli are good, and when it is 14% by mass or less, the stability, particularly low-temperature stability, is good.

[0045] <(B) At least one plant extract selected from a Sasa kurilensis extract and a water extract of mint> The plant extract as component (B) is at least one selected from a Sasa kurilensis extract and a water extract oil of peppermint, and is contained mainly to improve the bactericidal activity against Escherichia coli.

[0046] -Sasa kurilensis extract- The Sasa kurilensis ( Now kurilensis ) is a member of the Poaceae family ( Poaceae ) Bambusoideae ( Bambusoideae ) Sasa genus ( Now It is a monocotyledonous plant belonging to the family of monocotyledons. It grows widely in Japan, both wild and cultivated, and is easily available.

[0047] The Sasa kurilensis used as the extraction raw material may be a variant of Sasa kurilensis. The variant of Kurile Sasa is not particularly limited as long as it exhibits the effects of the present invention and can be appropriately selected depending on the purpose, and examples include Kiakebononemagari, Gintai chishima, Kintaichishima, Kinmei chishima, Shimofurinemagari, Takaranemagari, Chabokonshimachishima, Chabomakiba, Chaboshimofurichishima, Nochizaekifunemagari, Makibanemagari, Miirochishima, Ezonemagari variant, Nagabanemagaridake, etc. These may be used alone or in combination of two or more. In this specification, Sasa kurilensis and its varieties are collectively referred to as "Sasa kurilensis species." Furthermore, an extract of the Sasa kurilensis species is referred to as "Sasa kurilensis extract." The method for obtaining the Sasa kurilensis species is not particularly limited and can be appropriately selected depending on the purpose. The species may be collected from nature or may be commercially available.

[0048] The Sasa kurilensis extract can be easily obtained by a method commonly used for plant extraction, but in terms of bactericidal activity against E. coli and liquid appearance, extractions by extraction methods such as steam distillation and compression extraction are preferred, and purified products of the extracts are more preferred. These extraction methods may be used alone or in combination of two or more.

[0049] The part of the Sasa kurilensis used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose, and examples include above-ground parts such as flowers, buds, fruits, pericarp, seeds, seed coats, stems, leaves, branches, and foliage; and underground parts such as roots and rhizomes. These may be used alone or in combination of two or more. Among these, above-ground parts are preferred as the part of the Sasa kurilensis used.

[0050] There are no particular restrictions on the size of the Kumamoto bamboo used as the extraction raw material, and it can be selected appropriately depending on the purpose. For example, it can be the size as it is when collected, cut to the desired size, or pulverized (powdered) size.

[0051] The state of the Sasa kurilensis used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose, and examples include the state as collected, dried, or crushed.

[0052] There are no particular restrictions on the method for drying the Kumamoto bamboo species used as the extraction raw material, and it can be selected appropriately depending on the purpose. Examples include drying in the sun and drying using a commonly used dryer.

[0053] There are no particular restrictions on the method for pulverizing the Kumamoto bamboo species used as the extraction raw material, and it can be selected appropriately depending on the purpose. Examples include pulverization methods using a mixer, sugar mill, power mill, jet mill, impact crusher, etc.

[0054] When the Sasa kurilensis extract is prepared by steam distillation, the water used as the extraction solvent is not particularly limited and can be appropriately selected depending on the purpose, and examples include pure water, tap water, well water, mineral water, hot spring water, spring water, fresh water, purified water, hot water, ion-exchanged water, physiological saline, phosphate buffer, phosphate buffered physiological saline, etc. These may be used alone or in combination of two or more.

[0055] The amount of the extraction solvent used is not particularly limited and can be appropriately selected depending on the purpose.

[0056] The extraction conditions for the Sasa kurilensis extract (extraction time, extraction temperature, atmospheric conditions such as pressure, etc.) are not particularly limited, and can be appropriately selected from known methods depending on the purpose. In the case of the compression extraction method, it is preferable to carry out the method at low temperature and high pressure, and generally, the extraction is carried out at a temperature of 70° C. or less and under reduced pressure of 100 mmHg to 700 mmHg.

[0057] The state of the Sasa kurilensis extract is not particularly limited and can be selected appropriately depending on the purpose, and may be, for example, the Sasa kurilensis extract itself, a crude or purified product of the Sasa kurilensis extract, a concentrate of the Sasa kurilensis extract, a diluted product of the Sasa kurilensis extract, a dried product of the Sasa kurilensis extract, etc. The Sasa kurilensis extract may also be obtained by mixing or dissolving the dried product of the Sasa kurilensis extract in water again.

[0058] Among these, the Sasa kurilensis extract is preferably Sasa kurilensis water obtained by extracting and purifying Sasa kurilensis by low-temperature, high-pressure compression extraction. Examples of commercially available products of such Kumazasa extract include Aqua Aroma Kumazasa (manufactured by Arista Health and Nutrition Science Co., Ltd.) and Kumazasa Water K2-C (manufactured by Nippon Haruma Co., Ltd.).

[0059] The content of the Sasa kurilensis extract is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of bactericidal activity against Escherichia coli, it is preferably 0.5% by mass to 1.5% by mass, and more preferably 0.5% by mass to 1.2% by mass, relative to the total amount of the skin cleanser composition. When the content of the Sasa kurilensis extract is 0.5% by mass or more or 1.5% by mass or less, the bactericidal activity against Escherichia coli is good.

[0060] -Mint water extract- The mint used as the raw material for extracting the water extract of the mint is a member of the Lamiaceae family ( Lamiaceae ) Mint genus( Mint ) and most species are perennials, but there are also annual species. They grow widely in Japan, both wild and cultivated, and are easily available.

[0061] The aforementioned Mint genus ( Mint The plants belonging to the genus Mentha are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include Japanese mint (also known as Japanese mint), water mint, bergamot mint, green mint, common mint, and American mint. These may be used alone or in combination of two or more. Among these, Japanese mint and American mint are preferred. The method for obtaining the Mint plant is not particularly limited and can be appropriately selected depending on the purpose. The plant may be collected from nature or may be a commercially available product.

[0062] The water extract of mint can be easily obtained by a method commonly used for plant extraction, but an extract extracted and purified by steam distillation is preferred in terms of its bactericidal activity against Escherichia coli and liquid appearance.

[0063] The part of the mint plant used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include above-ground parts such as flowers, buds, fruits, pericarp, seeds, seed coats, stems, leaves, branches, and foliage; and underground parts such as roots and rhizomes. These may be used alone or in combination of two or more. Among these, above-ground parts are preferred as the part of the mint plant.

[0064] The size of the plant belonging to the genus Mint used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose. For example, the size may be that as it is when harvested, cut to a desired size, or pulverized (powdered) size.

[0065] The state of the plant belonging to the genus Mint used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose. For example, the plant may be in the state as collected, dried, crushed, or squeezed juice.

[0066] The method for drying the plant belonging to the genus Mint used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose. Examples include a method of drying in the sun and a method of drying using a commonly used dryer.

[0067] The method for pulverizing the plant belonging to the genus Mentha used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose. Examples include pulverization methods using a mixer, sugar mill, power mill, jet mill, impact pulverizer, etc.

[0068] The method for extracting juice from the plant belonging to the genus Mint used as the extraction raw material is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include squeezing.

[0069] The water used as the extraction solvent for the water extract of mint is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include pure water, tap water, well water, mineral water, hot spring water, spring water, fresh water, purified water, hot water, ion-exchanged water, physiological saline, phosphate buffer, phosphate buffered physiological saline, etc. These may be used alone or in combination of two or more.

[0070] The amount of the extraction solvent used is not particularly limited and can be appropriately selected depending on the purpose.

[0071] The extraction conditions for the water extract of mint (extraction time, extraction temperature, atmospheric conditions such as pressure, etc.) are not particularly limited, and can be appropriately selected from known methods depending on the purpose.

[0072] The state of the mint water extract is not particularly limited and can be appropriately selected depending on the purpose, and may be, for example, the mint water extract itself, a crude or purified product of the mint water extract, a concentrate of the mint water extract, a diluted product of the mint water extract, a dried product of the mint water extract, etc. The mint water extract may also be obtained by mixing or dissolving the dried product of the mint water extract in water again.

[0073] Among these, the water extract of mint is preferably mint oil extracted and purified by steam distillation from a plant belonging to the genus Mint. Examples of commercially available water extracts of such mint include, under the trade names, Menthol Oil (manufactured by Suzuki Mint Co., Ltd.) and Mint White Oil (manufactured by Nagaoka Jitsugyo Co., Ltd.).

[0074] The content of the mint water extract is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoints of bactericidal activity against E. coli and odor, it is preferably 0.1% by mass to 0.6% by mass, and more preferably 0.2% by mass to 0.5% by mass, relative to the total amount of the skin cleanser composition. When the content of the mint water extract is 0.1% by mass or more, the bactericidal activity against E. coli is good, and when it is 0.6% by mass or less, the specific odor can be suppressed.

[0075] <(C) At least one polyhydric alcohol selected from glycerin, 1,3-butylene glycol, and propylene glycol> The polyhydric alcohol as component (C) is contained mainly to improve the foam quality and the feel after washing.

[0076] The polyhydric alcohol of the component (C) is at least one selected from glycerin, 1,3-butylene glycol, and propylene glycol.

[0077] The polyhydric alcohol of the component (C) may be either an appropriately synthesized product or a commercially available product. Examples of commercially available glycerin products as the polyhydric alcohol of component (C) include ELOGLYN R995 (glycerin) (manufactured by LG Household & Health Care), concentrated glycerin for cosmetics (manufactured by Miyoshi Oil & Fats Co., Ltd.), and Triol VE (manufactured by Kokyu Alcohol Kogyo Co., Ltd.).

[0078] An example of a commercially available product of 1,3-butylene glycol as the polyhydric alcohol of component (C) is High Sugar Cane BG (manufactured by Kokyu Alcohol Kogyo Co., Ltd.).

[0079] Examples of commercially available propylene glycol as the polyhydric alcohol of component (C) include cosmetic propylene glycol (manufactured by ADEKA) and Propylene Glycol JSQI (manufactured by Dow Chemical).

[0080] The content of the polyhydric alcohol in component (C) is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of foam quality and post-rinse feel, it is preferably 3 to 12 mass % and more preferably 5 to 10 mass % relative to the total amount of the skin cleanser composition. When the content of component (C) is 3 mass % or more, the foam quality and post-rinse feel are good, and when it is 12 mass % or less, the foam quality and post-rinse feel are good.

[0081] <Mass ratio [(C) / (B)]> The mass ratio [(C) / (B)] of the content (mass%) of the component (C) to the content (mass%) of the component (B) is 3 to 30, preferably 5 to 25, in order to achieve high bactericidal activity against Escherichia coli and low bactericidal activity against Staphylococcus epidermidis (a normal skin flora). If the mass ratio [(C) / (B)] is less than 3 or exceeds 30, the bactericidal activity against Escherichia coli decreases.

[0082] <(D) Amphoteric surfactant> The amphoteric surfactant as component (D) is contained mainly to improve foam quality.

[0083] The amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include alkylbetaine-type amphoteric surfactants, amidobetaine-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants, hydroxysulfobetaine-type amphoteric surfactants, amidosulfobetaine-type amphoteric surfactants, phosphobetaine-type amphoteric surfactants, imidazoline-type amphoteric surfactants, amine oxide-type amphoteric surfactants, etc. These may be used alone or in combination of two or more.

[0084] The alkyl betaine type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include lauryl dimethylaminoacetic acid betaine, lauryl betaine, etc. These may be used alone or in combination of two or more.

[0085] The amidobetaine amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include lauric acid amidopropyl betaine (lauramidopropyl betaine), stearyl dimethylaminoacetic acid betaine, cocamidopropyl betaine (coconut oil fatty acid amidopropyl betaine), etc. These may be used alone or in combination of two or more.

[0086] The sulfobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include coconut oil fatty acid dimethyl sulfopropyl betaine, etc. These may be used alone or in combination of two or more.

[0087] The hydroxysulfobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include lauryl hydroxysultaine, etc. These may be used alone or in combination of two or more.

[0088] The amidosulfobetaine amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include cocamidopropyl hydroxysultaine, lauramidopropyl hydroxysultaine, etc. These may be used alone or in combination of two or more.

[0089] The phosphobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include lauryl hydroxyphosphobetaine, etc. These may be used alone or in combination of two or more.

[0090] The imidazoline-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include coconut oil alkyl-N-hydroxyethyl imidazolinium betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, etc. These may be used alone or in combination of two or more.

[0091] The amine oxide type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include lauryl dimethylamine oxide, coconut oil alkyl dimethylamine oxide, etc. These may be used alone or in combination of two or more.

[0092] The amphoteric surfactant of the component (D) may be an appropriately synthesized product or a commercially available product. Commercially available amphoteric surfactants of component (D) include, for example, trade names such as NIKKOL AM-3130N (cocamidopropyl betaine, manufactured by Nikko Chemicals Co., Ltd.), TEGO Betaine (cocamidopropyl betaine, manufactured by Evonik), Amphitol 20AB (lauric acid amidopropyl betaine, manufactured by Kao Corporation), MITAINE L (lauryl betaine, manufactured by Miwon Commercial), Amphorex LSB (lauryl hydroxysultaine, manufactured by Miyoshi Oil & Fats Co., Ltd.), Amphitol 20HD (lauryl hydroxysultaine, manufactured by Kao Corporation), Softazoline LSB (lauramidopropyl hydroxysultaine, manufactured by Kawaken Fine Chemicals Co., Ltd.), and Softazoline. Examples include CH (2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, manufactured by Kawaken Fine Chemicals Co., Ltd.), Amphitol 20N (lauryl dimethylamine oxide, manufactured by Kao Corporation), and Unisafe (registered trademark) A-LM (lauryl dimethylamine oxide, manufactured by NOF Corporation).

[0093] The content of the amphoteric surfactant of component (D) is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoints of foam quality and non-irritation to hand skin, it is preferably 0.1 to 5 mass %, and more preferably 0.5 to 4 mass %, of the total amount of the skin cleanser composition. When the content of component (D) is 0.1 mass % or more, good foam quality is achieved, and when it is 5 mass % or less, non-irritation to hand skin is good.

[0094] <Other ingredients> In addition to the components (A), (B), (C), and (D), the skin cleanser composition of the present invention may contain other components that are typically used in skin cleanser compositions, etc., as needed, within the scope of the present invention.

[0095] The other components are not particularly limited and can be appropriately selected depending on the purpose. Examples of the other components include silicones, moisturizers, anionic surfactants other than the component (A) (e.g., sodium polyoxyethylene alkyl ether sulfate, etc.), nonionic surfactants (e.g., polyoxyethylene alkyl ether, etc.), cationic surfactants (e.g., stearyltrimethylammonium chloride, etc.), anti-inflammatory agents (e.g., dipotassium glycyrrhizinate, glycyrrhetinic acid, allantoin, etc.), vitamins, cationic polymers (e.g., cationized cellulose, cationized guar gum, polydimethyldimethylenepyrrolidinium chloride (polyquaternium-6), dimethyldiallylammonium chloride-acrylamide copolymer, etc.), amphoteric polymers (e.g., acrylic acid / dimethyldiallylammonium copolymer, etc.), anionic polymers (for example, acrylic acid-based polymers, etc.), animal extracts or derivatives thereof, plant extracts or derivatives thereof other than the component (B), pearlizing agents, colorants, scrubbing agents (for example, polyethylene, etc.), fragrances, coloring materials, pigments, preservatives other than the component (B) (for example, methylparaben, phenoxyethanol, etc.), sugars, oils, lanolin derivatives, protein derivatives, acrylic resin dispersions, antioxidants, sequestering agents, UV absorbers, humectants (for example, sorbitol, etc.), emulsifiers (for example, steareth-11, trideceth-8, octyldodeceth-5, etc.), chelating agents (for example, EDTA-4Na, etc.), pH adjusters (for example, potassium hydroxide, monoethanolamine, etc.), solvents (for example, water, etc.), and the like.

[0096] -pH- The pH of the skin cleanser composition at 25° C. is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 8.0 to 12.0, more preferably 8.5 to 11.0. The pH can be measured, for example, using a pH meter (HM-30V, manufactured by DKK-TOA Corporation).

[0097] -container- The skin cleanser composition of the present invention is not particularly limited, and is filled into a conventional container for use. The container is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include pump dispenser containers, tube containers, former containers, squeeze containers, bag-shaped containers, etc. Among these, former containers are preferred.

[0098] The former container is not particularly limited and can be appropriately selected from known former containers, for example, a non-gas type foam discharging container, an aerosol container using a propellant and a pressure-resistant container, etc. Among these, a non-gas type foam discharging container is preferred.

[0099] The non-gas foam-dispensing container is not particularly limited as long as it can mix the skin cleanser composition with air and dispense it in a foamed state, and can be appropriately selected depending on the purpose. Examples include a squeeze foamer container that can dispense foam by manually squeezing the bottle body, and a pump foamer container that can dispense foam by pressing down the nozzle. Such foamer containers can be manufactured by Yamato Seikan Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, foamer containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972 can be used.

[0100] The non-gas type foam dispensing container usually has a foam forming member for forming foam. Specific examples of the non-gas foam-discharging container include those having a porous membrane (preferably made of a plastic material such as nylon, polyester, or polyolefin), in which foam is formed when the skin cleanser composition passes through the porous membrane.

[0101] The mesh of the porous membrane is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 100 mesh or more, more preferably 100 mesh to 400 mesh, and particularly preferably 200 mesh to 305 mesh. The number of the porous membrane bodies is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of improving foam performance, 2 to 4 membrane bodies are preferred.

[0102] -Properties- The state of the skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably liquid at room temperature. The viscosity of the skin cleanser composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 1 mPa·s to 30 mPa·s, and more preferably 3 mPa·s to 30 mPa·s. When the viscosity is 1 mPa·s or more or 30 mPa·s or less, good foam quality is obtained. Furthermore, when using a foamer container, for example, a pump foamer container capable of discharging foam by depressing the nozzle part, and two 200-mesh porous membranes, the viscosity of the skin cleanser composition under the temperature conditions used is preferably 15 mPa s or less, and more preferably 1 mPa s to 10 mPa s. Here, the viscosity can be measured, for example, using a Brookfield viscometer, by setting the temperature of the skin cleanser composition to 25°C, measuring the viscosity after 1 minute at a rotation speed of 60 rpm using a No. 1 rotor.

[0103] -Manufacturing method- The method for producing the skin cleanser composition of the present invention is not particularly limited and can be appropriately selected depending on the purpose, and can be obtained, for example, by mixing the (A), (B), (C), and (D) components, and further, if necessary, the other components, and purified water (blended as the remainder so that the total amount of the skin cleanser composition becomes 100% by mass). When mixing, heating may be performed as necessary.

[0104] The skin cleanser composition may be prepared using an apparatus that is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a stirring apparatus equipped with stirring blades that exert shear force and can mix the entire composition. The stirring blade is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include a propeller, a turbine, and a disperser.

[0105] -Applications- The area where the skin cleanser composition is applied is not particularly limited and can be appropriately selected depending on the purpose. For example, the skin cleanser composition can be applied to the whole body, face, hands, etc. The method of using the skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose, but it is preferable to fill the composition into a foamer container and discharge it in the form of foam.

[0106] The skin cleanser composition has high bactericidal activity against pathogenic Escherichia coli and the like while preserving normal bacteria that enhance the barrier function of the skin, is free from coloration, has a good liquid appearance, is free from an unpleasant taste or odor, and is excellent in foam quality, feel after cleansing, non-irritation to the hands and skin, and stability. Therefore, the skin cleanser composition can be used, for example, in body shampoos, body soaps, facial cleansers, liquid hand soaps, foam hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in liquid hand soaps that are dispensed in foam form. [Example]

[0107] The present invention will be specifically explained below with reference to examples, comparative examples, and formulation examples, but the present invention is not limited to these examples and formulation examples.

[0108] The content of each component in the Examples, Comparative Examples, and Formulation Examples is expressed in mass % and is a value converted to a pure content. The mass ratio of the content (mass %) of component (C) to the content (mass %) of component (B) [(C) / (B)] was calculated by rounding to one decimal place.

[0109] (Examples 1 to 32 and Comparative Examples 1 to 12) <Preparation of Skin Cleansing Composition> At 70°C to 80°C, components (A), (C), and (D) were uniformly dissolved in purified water and the common components, with the compositions and contents (mass%) shown in Tables 1 to 6 below. After cooling to 40°C or below, component (B) or a comparative component for component (B) was added and stirred until uniform, yielding a solution. While stirring, potassium hydroxide was then added appropriately to the solution, adjusting the pH to the desired level. Purified water was then added to each solution until the total volume was 100% by mass, yielding the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12. As shown in Table 7 below, component (B) "peppermint oil" is an extract obtained by steam distillation extraction, component (B) "Kurile bamboo water" is an extract obtained by compression extraction, and the comparative component of component (B) is a solvent extract using butylene glycol or ethanol as the extraction solvent.

[0110] For each of the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12, the "bactericidal activity against Escherichia coli," "liquid appearance," "odor," "foam quality" (foam elasticity, foam creaminess, and foam persistence), "feel after cleansing" (refreshing feeling after rinsing and moist feeling after rinsing), "non-irritation to hands and skin," and "stability" (low-temperature stability, high-temperature stability, and pH) were evaluated and judged as follows. Furthermore, for each of the skin cleanser compositions of Examples 1 to 32, the "bactericidal activity against Staphylococcus epidermidis" was evaluated and judged as follows. The results are shown in Tables 1 to 6 below.

[0111] <Bactericidal effect against E. coli> (1) Preparation of bacterial suspension Typical E. coli that causes infectious diseases ( Escherichia coli NBRC3972 (Gram-negative bacterium, obtained from the National Institute of Technology and Evaluation) was statically cultured in SCDLP medium (manufactured by Nippon Pharmaceutical Co., Ltd.) at 30°C under aerobic conditions for 24 hours. Next, the E. coli was suspended in physiological saline (manufactured by Otsuka Pharmaceutical Co., Ltd.) until the initial cell count reached 10. 6 The concentration was adjusted to cells / mL to prepare a bacterial solution.

[0112] (2) Preparation of test solution Each of the skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 12 was diluted 10 times with sterilized water to prepare each test liquid.

[0113] (3) Evaluation method At 25°C, 0.1 mL of the bacterial solution obtained in (1) was added to 10 mL of each test solution obtained in (2) above and thoroughly stirred. 30 seconds after the addition of (1), 0.3 mL of the mixed solution was removed and added to 2.7 mL of SCDLP agar medium (Soybean-Casein Digest Broth with Lectin & Polysorbate 80, manufactured by Wako Pure Chemical Industries, Ltd.) to obtain a 10-fold diluted solution. The same method was repeated to obtain 10-fold diluted solutions of the bacterial solution. 2 double, 10 3 times, and 10 4 Each diluted solution was diluted 1.0 mL into a petri dish, homogenized with 15 mL of SCDLP agar medium, and cultured at 30°C for 1 day. The number of colonies was counted to determine the number of surviving bacteria (agar plate dilution method). The difference between the initial number of bacteria and the number of surviving bacteria (Δlog 10 ) was calculated, and the "bactericidal activity against Escherichia coli" was judged based on the following criteria. Note that the larger the value calculated by the following formula (1), the higher the bactericidal activity. Sterilization number Δlog 10 =-log 10 (Number of surviving bacteria / Number of initial bacteria) Equation (1) - Criteria for determining "bactericidal activity against E. coli" - ◎: Δlog 10 But 2.7 or more ○: Δlog 10 but between 2.5 and 2.7 △: Δlog 10 but between 2.0 and 2.5 × : Δlog 10 But less than 2.0

[0114] <Liquid appearance> Immediately after preparation, 50 g of each skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a hard glass vial, and one expert panelist visually observed the liquid appearance and judged the "liquid appearance" based on the following criteria. - Criteria for "Liquid Appearance" - ◎: The liquid color is transparent ○: The liquid is slightly yellow △: The liquid is yellow ×: The liquid is brown in color

[0115] <Smell> Immediately after preparation, 50 g of each skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a hard glass vial, and three expert panelists evaluated the "odor" based on the following criteria. The results were calculated by calculating the average score of the three expert panelists and judging based on the following criteria. -Evaluation criteria for "smell"- 5: No distinctive odor at all 4: A slight peculiar smell is detected 3: A slight peculiar smell is detected 2: A specific odor is quite noticeable, but there is no unpleasant odor. 1: The specific odor is strong and unpleasant. - Criteria for determining "odor" - ◎: Average rating is 4.0 or higher ○: Average evaluation score is 3.0 or more and less than 4.0 points △: Average rating is between 2.0 and 3.0 points ×: Average rating is less than 2.0 points

[0116] <Foam quality> Each of the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a foamer container (manufactured by Yoshino Kogyosho Co., Ltd.). Three expert panelists evaluated (1) "foam elasticity," (2) "foam creaminess," and (3) "foam durability" of each of the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12 filled into the container using the following methods. The average evaluation scores of the three expert panelists were calculated for each item, and the total score of the average evaluation scores for the three items was calculated. The "foam quality" was then judged based on the following criteria. -Criteria for determining "foam quality"- ◎: The total average score of (1) to (3) is 12.0 points or more, and the average score of all items (1) to (3) is 4 points or more ○: The total average score of (1) to (3) is 9.0 points or more and less than 12.0 points, and the average score of all items (1) to (3) is 3 points or more. △: The total average score of (1) to (3) is 6.0 or more and less than 9.0 points, and the average score of all items (1) to (3) is 2 points or more for all items. ×: The total average score of (1) to (3) is less than 6.0 points

[0117] (1) Foam elasticity Three expert panelists wet both hands with water, shook them once to lightly dry them, and then dispensed 1 g (1 push) of each skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 12 from a foamer container onto the palm of their right hand at 25° C. They rubbed their palms together in a back-and-forth motion, and after 10 back-and-forth movements, pressed their left hand against the foam collected in the palm of their right hand, and evaluated the "foam elasticity" according to the following evaluation criteria. -Evaluation criteria for "foam elasticity"- 5 points: The foam is very elastic 4 points: The foam is elastic 3 points: The foam is somewhat elastic 2 points: The foam is not very elastic 1 point: The foam has almost no elasticity

[0118] (2) Creaminess of the foam Three expert panelists wet both hands with water, shook them once to lightly dry them, and then dispensed 1 g (1 push) of each skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 12 from a foamer container onto the palm of their right hand at 25° C. They rubbed their palms together in a back-and-forth motion, and after rubbing their hands back and forth 10 times, the appearance of the foam was visually observed, and the "creamyness of the foam" was evaluated based on the feel during use according to the following evaluation criteria. -Evaluation criteria for "creamy foam"- 5 points: Most of the foam was fine and very creamy 4 points: There were some large bubbles mixed in with the fine bubbles, but it was creamy. 3 points: Large bubbles were mixed in with fine bubbles, and it was slightly creamy. 2 points: There were more large, coarse bubbles than fine ones, and it was not creamy. 1 point: Only large, coarse bubbles formed, not creamy at all

[0119] (3) Durability of foam Three expert panelists wet both hands with water, shook them once to lightly dry them, and then dispensed 1 g (1 push) of each skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 12 from a foamer container onto the palm of their right hand at 25°C. They placed their palms together and rubbed them back and forth, rubbing them back and forth 10 times, and then allowed to stand for 10 seconds. The foam volume (Fa) immediately after rubbing the hands back and forth 10 times and the foam volume (Fb) after leaving the hands to stand for 10 seconds were visually observed, and the "foam persistence" was evaluated according to the following evaluation criteria. -Evaluation criteria for "creamy foam"- 5 points: No change at all between foam volume (Fa) and foam volume (Fb) 4 points: Almost no change between foam volume (Fa) and foam volume (Fb) 3 points: The foam volume (Fb) is reduced compared to the foam volume (Fa) 2 points: The foam volume (Fb) is significantly reduced compared to the foam volume (Fa). 1 point: No foam remains on hands for both foam volume (Fa) and foam volume (Fb)

[0120] <Feel after washing> Each of the skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a former container (manufactured by Yoshino Kogyosho Co., Ltd.). Three expert panelists evaluated (1) "refreshing feeling after rinsing" and (2) "moist feeling after rinsing" of each of the skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 12 filled into the container using the following methods. The average evaluation scores of the three expert panelists were calculated for each item, and the total score of the average evaluation scores for (1) and (2) was calculated. The "feel after cleansing" was then judged based on the following criteria. - "Feel after washing" evaluation criteria - ◎: The total average score of (1) and (2) is 8.0 points or more ○: The total average score of (1) and (2) is 7.0 points or more but less than 8.0 points △: The total average score of (1) and (2) is 5.0 points or more but less than 7.0 points ×: The total average score of (1) and (2) is less than 5.0 points

[0121] (1) Refreshing feeling after rinsing Three expert panelists wet both hands with water, shook them once to lightly dry them, and then dispensed 1 g (1 push) of each skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 12 from a foamer container onto the palm of their right hand at 25° C. The panelists placed their palms together and rubbed them back and forth for 10 seconds, then rinsed them with tap water (25° C., 2 L / min).When each expert panelist determined that rinsing was complete, the panelists evaluated the "refreshing feeling after rinsing" according to the following criteria. -Evaluation criteria for "refreshing feeling after rinsing"- 5 points: Very refreshing 4 points: Refreshing 3 points: Slightly refreshing 2 points: Not very refreshing 1 point: No refreshing feeling at all

[0122] (2) Moisturizing feeling after rinsing Three expert panelists wet both hands with water, shook them once to lightly dry them, and then dispensed 1 g (1 push) of each skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 12 from a foamer container onto the palm of their right hand at 25° C. The panelists rubbed their palms together in a back-and-forth motion, rubbing their hands together for 10 seconds, and then rinsed their hands with tap water (25° C., 2 L / min).When each expert panelist determined that rinsing was complete, they evaluated the "moist feeling after rinsing" according to the following evaluation criteria. -Evaluation criteria for "moisturizing feeling after rinsing"- 5 points: Very moist 4 points: Moist feeling 3 points: Slightly moist 2 points: Not very moisturizing 1 point: No moist feeling at all

[0123] <No irritation to the skin> Each of the skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a former container (manufactured by Yoshino Kogyosho Co., Ltd.). Three expert panelists wet both hands with water, shook them once to lightly dry them, and then dispensed 1 g (1 push) of each skin cleanser composition from Examples 1 to 32 and Comparative Examples 1 to 12 from a former container onto the palm of their right hand at 25°C. The panelists placed their palms together and rubbed them back and forth for 10 seconds. After rinsing their hands with tap water (25°C, 2 L / min), they towel-dried them and evaluated the "non-irritation to the hands" according to the following criteria. The results were calculated by calculating the average score of the three expert panelists and rated according to the following criteria. -Evaluation criteria for "non-irritation to hand skin"- 5: No irritation to hands during washing or drying 4: There is almost no irritation to the skin during washing and drying. 3: Slight irritation to hands during washing or drying 2: Irritation to hands during washing or drying 1: There is strong irritation to the skin of the hands during washing or drying. -Criteria for determining "non-irritation to hand skin"- ◎: Average rating of 4.0 or above 〇: Average rating is 3.0 or more and less than 4.0 △: Average rating is between 2.0 and 3.0 ×: Average rating is less than 2.0

[0124] <Stability> The skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12 were evaluated for (1) "low-temperature stability," (2) "high-temperature stability," and (3) "pH" by the following methods. The total score for each of the items (1) to (3) was calculated, and the "stability" was judged based on the following criteria. - Criteria for determining "stability" - ◎: The total score of (1) to (3) is 12.0 points or more, and all items of (1) to (3) are 3 points or more ○: The total score of (1) to (3) is 9.0 or more and less than 12.0 points, and all items of (1) to (3) are 3 points or more. △: The total score of (1) to (3) is between 6.0 and 9.0 points, and all items of (1) to (3) are 2 points or more. ×: The total score of (1) to (3) is less than 6.0 points

[0125] (1)Low temperature stability 50 g of each of the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a hard glass vial and stored in an environment at 10°C for one month, or stored in an environment at 10°C for one month and then returned to 25°C. After that, one expert panelist visually observed the appearance of the liquid and evaluated the "low-temperature stability" based on the following evaluation criteria. -Evaluation criteria for "low temperature stability"- 5 points: No precipitation after 1 month storage at 10°C 4 points: No precipitates when returned to 25°C after storage at 10°C for 1 month 3 points: After storing at 10°C for one month, slight turbidity due to precipitate is observed when returned to 25°C. 2 points: Precipitation is observed when the temperature is returned to 25°C after storing at 10°C for one month 1 point: A large amount of precipitate was observed when the temperature was returned to 25°C after storing at 10°C for one month.

[0126] (2) High temperature stability 50 g of each of the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a hard glass vial and stored in an environment of 50°C for one month. After that, one expert panel member visually observed the appearance of the liquid and evaluated the odor, and evaluated the "high-temperature stability" based on the following evaluation criteria. -Evaluation criteria for "high temperature stability"- 5 points: No change in color or odor after 1 month of storage at 50°C compared to before storage 4 points: After storing at 50°C for one month, there is almost no change in color or odor compared to before storage. 3 points: After one month of storage at 50°C, there is a slight change in color or odor compared to before storage, but it is not a problem in terms of commercial value. 2 points: After one month of storage at 50°C, there is a change in color or odor compared to before storage, and there is a problem with the product's commercial value. 1 point: After storing at 50°C for one month, the color or odor has changed significantly compared to before storage, and there is a problem with the product's commercial value.

[0127] (3) pH 50 g of each of the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12 was filled into a hard glass vial and stored in an environment of 50°C for one month. After that, the pH was measured using a pH meter (HM-30V, manufactured by DKK-TOA Corporation), and the "pH" was evaluated based on the following evaluation criteria. - "pH" evaluation criteria - 5 points: pH change after 1 month at 50°C is within ±0.2 compared to before storage 4 points: pH change after 1 month storage at 50°C is greater than ±0.2 and less than ±0.4 compared to before storage 3 points: After one month of storage at 50°C, the pH change is greater than ±0.4 and less than ±0.6 compared to before storage. 2 points: After storing at 50°C for one month, the pH change is greater than ±0.6 and less than ±0.8 compared to before storage. 1 point: pH change after 1 month storage at 50°C is more than ±0.8 compared to before storage

[0128] <Bactericidal activity against Staphylococcus epidermidis> Because Staphylococcus epidermidis is a normal inhabitant of the skin with a barrier function, it is preferable that a skin cleanser composition have low bactericidal activity against Staphylococcus epidermidis. Therefore, the bactericidal activity of each of the skin cleanser compositions of Examples 1 to 32 against Staphylococcus epidermidis was evaluated by the following method.

[0129] (1) Preparation of bacterial suspension Staphylococcus epidermidis ( Staphylococcus epidermidisATCC12228, obtained from the National Institute of Technology and Evaluation (NBRC), was statically cultured in SCDLP medium (Nihon Pharmaceutical Co., Ltd.) at 30°C under aerobic conditions for 24 hours. Next, the Staphylococcus epidermidis was suspended in physiological saline (Otsuka Pharmaceutical Co., Ltd.) until the initial cell count reached 10. 6 The concentration was adjusted to cells / mL to prepare a bacterial solution.

[0130] (2) Preparation of test solution Each of the skin cleansing compositions of Examples 1 to 32 was diluted 10 times with sterile water to prepare each test liquid.

[0131] (3) Evaluation method At 25°C, 0.1 mL of the bacterial solution obtained in (1) was added to 10 mL of each test solution obtained in (2) above and thoroughly stirred. 30 seconds after the addition of (1), 0.3 mL of the mixed solution was removed and added to 2.7 mL of SCDLP agar medium (Soybean-Casein Digest Broth with Lectin & Polysorbate 80, manufactured by Wako Pure Chemical Industries, Ltd.) to obtain a 10-fold diluted solution. The same method was repeated to obtain 10-fold diluted solutions of the bacterial solution. 2 double, 10 3 times, and 10 4 Each diluted solution was diluted 1.0 mL into a petri dish, and 15 mL of SCDLP agar medium was added to homogenize the diluted solution. After culturing at 30°C for 2 days, the number of colonies was counted to determine the number of surviving bacteria (agar plate dilution method). The difference between the initial number of bacteria and the number of surviving bacteria (Δlog 10 ) was calculated, and the "bactericidal activity against Staphylococcus epidermidis" was judged based on the following criteria. Note that the larger the value calculated by the following formula (2), the higher the bactericidal activity. Sterilization number Δlog 10 =-log 10 (Number of surviving bacteria / Number of initial bacteria) Equation (2) -Criteria for determining "bactericidal activity against Staphylococcus epidermidis"- ◎: Δlog 10 but less than 1.0 ○: Δlog 10 is greater than or equal to 1.0 and less than 2.0 △: Δlog10 but between 2.0 and 3.0 × : Δlog 10 But 3.0 or higher

[0132] [Table 1]

[0133] [Table 2]

[0134] [Table 3]

[0135] [Table 4]

[0136] [Table 5]

[0137] [Table 6]

[0138] (Prescription Examples 1-8) <Preparation of Skin Cleansing Composition> The skin cleanser compositions of Formulation Examples 1 to 8 were obtained in the same manner as in the preparation of the skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 12, except that the compositions and contents (mass%) were changed to those shown in Table 7 below.

[0139] [Table 7]

[0140] [Table 8]

[0141] Details of each component used in Examples 1 to 32, Comparative Examples 1 to 12, and Formulation Examples 1 to 12 are shown in Table 9 below.

[0142] [Table 9] *1: Potassium laurate was prepared by neutralizing lauric acid (Kortacid 1299, manufactured by Pacific Oleochemicals) with potassium hydroxide (POTASSIUM HYDROXIDE 48%, manufactured by UNID). *2: Potassium myristate was prepared by neutralizing myristic acid (Kortacid 1499, manufactured by Pacific Oleochemicals) with potassium hydroxide (POTASSIUM HYDROXIDE 48%, manufactured by UNID). [Industrial Applicability]

[0143] The skin cleanser composition has high bactericidal activity against pathogenic Escherichia coli and the like while preserving normal bacteria that enhance the barrier function of the skin, is free from coloration, has a good liquid appearance, is free from an unpleasant taste or odor, and is excellent in foam quality, feel after cleansing, non-irritation to the hands and skin, and stability. Therefore, the skin cleanser composition can be used, for example, in body shampoos, body soaps, facial cleansers, liquid hand soaps, foam hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in liquid hand soaps that are dispensed in foam form.

Claims

1. (A) a higher fatty acid salt; (B) at least one plant extract selected from a Sasa kurilensis extract and a water extract of mint; (C) at least one polyhydric alcohol selected from glycerin, 1,3-butylene glycol, and propylene glycol; (D) at least one amphoteric surfactant selected from alkylbetaine amphoteric surfactants and amine oxide amphoteric surfactants; Contains The Sasa kurilensis extract is a Sasa kurilensis water obtained by compressing and extracting Sasa kurilensis under a reduced pressure of 100 mmHg to 700 mmHg at an extraction temperature of 70°C or less, and purifying the extract; The water extract of mint is mint oil obtained by steam distillation and purification of a plant belonging to the genus Mint; The content of the component (A) is 3% by mass to 14% by mass, When the component (B) contains the Sasa kurilensis extract, the content of the Sasa kurilensis extract is 0.5% by mass to 1.5% by mass, When the component (B) contains the water extract of mint, the content of the water extract of mint is 0.1% by mass to 0.6% by mass, The content of the component (C) is 3% by mass to 12% by mass, A liquid skin cleanser composition, characterized in that the mass ratio [(C) / (B)] of the content of the component (C) to the content of the component (B) is 3 to 30.

2. The content of the (A) component is 5% by mass to 12% by mass, When the component (B) contains the Sasa kurilensis extract, the content of the Sasa kurilensis extract is 0.5% by mass to 1.2% by mass, When the component (B) contains the water extract of mint, the content of the water extract of mint is 0.2% by mass to 0.5% by mass, 2. The liquid skin cleanser composition according to claim 1, wherein the content of the component (C) is 5% by mass to 10% by mass.

3. A liquid skin cleanser composition described in claim 1 or 2, wherein the content of component (D) is 0.5% by mass to 4% by mass.

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