Liquid skin cleaning agent composition

Abstract

A liquid skin cleaning agent composition which is characterized by containing (A) an anionic surfactant, (B) a phosphate salt, and (C) a bactericide, and which has a viscosity at 25 DEG C of 150 mPa * s or less.

Description

Technical Field

[0001] The present invention relates to liquid skin cleanser compositions. Background Art

[0002] In recent years, due to the increase in hygiene awareness caused by the spread of new viral infections, the number of hand washings per day has increased, and various liquid skin cleanser compositions have been proposed. In addition to having good foam properties such as foam persistence, liquid skin cleanser compositions are also required to provide a good cleansing feel when washing hands.

[0003] In order to provide a liquid detergent composition with good foam quality and low skin irritation, for example, a liquid detergent composition containing a fatty acid salt, an amphoteric surfactant or a semi-polar surfactant, and a compound having an acid dissociation index of 8.0 to 11.0 has been proposed (see, for example, Patent Document 1).

[0004] In addition, in order to provide a liquid skin cleanser composition having good foaming performance and good skin feel during and after cleansing, a liquid cleanser composition has been proposed, which comprises: an anionic surfactant, at least one cationic polymer selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers, and a copolymer containing methacryloylethyldimethylbetaine and methacryloylethyltrimethylammonium chloride as structural units (for example, refer to Patent Document 2).

[0005] However, none of the above proposals can satisfy the foam performance (particularly the density of the foam) and the real feeling of washing, and there is room for improvement.

[0006] Therefore, it is desired to provide a liquid skin cleansing composition having good foam performance (density of foam) and excellent cleansing feel.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: International Publication No. 2007 / 145054

[0010] Patent Document 2: International Publication No. 2020 / 090158 Summary of the invention

[0011] Problem that the invention aims to solve

[0012] The present invention aims to solve the above-mentioned problems and achieve the following objectives: Specifically, the present invention aims to provide a liquid skin cleanser composition having good foam performance (density of foam) and excellent cleansing feel.

[0013] Solutions for solving problems

[0014] The present inventors have conducted intensive studies to achieve the above-mentioned object and have found that a liquid skin cleanser composition containing (A) anionic surfactant, (B) phosphate and (C) bactericide and having a viscosity of 150 mPa·s or less at 25° C. can provide good foam performance (density of foam) and excellent cleansing feel.

[0015] The present invention was completed based on the above findings of the present inventors, and means for solving the above problems are as follows.

[0016] <1>

[0017] A liquid skin cleanser composition, characterized in that it contains (A) an anionic surfactant, (B) a phosphate and (C) a bactericide, wherein the viscosity of the liquid skin cleanser composition at 25° C. is 150 mPa·s or less.

[0018] <2>

[0019] According to the above <1> The liquid skin cleanser composition, wherein a mass ratio of the content of the (B) to the content of the (C) [(B) / (C)] is 1 or more and 10 or less.

[0020] <3>

[0021] According to the above <1> To the above <2> The liquid skin cleanser composition according to any one of the preceding claims, wherein the component (A) comprises palmitate.

[0022] <4>

[0023] According to the above <1> To the above <3> The liquid skin cleanser composition described above further comprises (D) monoethanolamine and (E) fragrance, wherein a mass ratio of the content of (D) to the content of (A) [(D) / (A)] is 0.08 to 0.5.

[0024] <5>

[0025] According to the above <1> To the above <4> The liquid skin cleanser composition according to any one of the preceding claims, wherein the content of (A) is 1% by mass or more and 25% by mass or less, the content of (B) is 0.05% by mass or more and 5% by mass or less, and the content of (C) is 0.05% by mass or more and 1% by mass or less, relative to the total amount of the liquid skin cleanser composition.

[0026] <6>

[0027] According to the above <1> To the above <5> The liquid skin cleanser composition according to any one of the above aspects is filled in a foaming container.

[0028] Effects of the Invention

[0029] According to the present invention, the above-mentioned problems of the related art can be solved, the above-mentioned objects can be achieved, and a liquid skin cleansing composition having good foam performance (density of foam) and excellent cleansing feel can be provided. DETAILED DESCRIPTION

[0030] (Liquid skin cleanser composition)

[0031] The liquid skin cleanser composition of the present invention contains (A) anionic surfactant, (B) phosphate and (C) bactericide, and may contain (D) monoethanolamine, (E) fragrance, (F) copolymer containing dimethyldiallylammonium chloride and containing at least one of acrylic acid and acrylamide as monomer units, and other components as needed. Furthermore, the liquid skin cleanser composition of the present invention is characterized in that the viscosity at 25° C. is 150 mPa·s or less.

[0032] In the present specification, "(A) anionic surfactant" is sometimes referred to as "(A)" or "(A) component", "(B) phosphate" is sometimes referred to as "(B)" or "(B) component", "(C) bactericide" is sometimes referred to as "(C)" or "(C) component", "(D) monoethanolamine" is sometimes referred to as "(D)" or "(D) component", "(E) fragrance" is sometimes referred to as "(E)" or "(E) component", and "(F) a copolymer containing dimethyldiallylammonium chloride and at least any one of acrylic acid and acrylamide as monomer units" is sometimes referred to as "(F)", "(F) component" or "(F) copolymer".

[0033] <(A) Anionic surfactant>

[0034] The anionic surfactant as the component (A) is contained mainly to improve the washing feel.

[0035] In this specification, "clean feeling" means that there is no stickiness or sliminess caused by dirt etc. during rinsing, and there is a refreshing touch.

[0036] The anionic surfactant of the component (A) 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, alkyl phosphate ester salts, polyoxyethylene (POE) alkyl ether phosphates, alkyl sulfosuccinates, polyoxyethylene (POE) alkyl sulfosuccinates, N-acyl methyl taurates, N-acyl sarcosinates, acylated isethionates, polyoxyethylene fatty acid amide ether sulfates, ether carboxylates, and amino acid-based surfactants, etc. Among them, higher fatty acid salts, polyoxyethylene (POE) alkyl ether sulfates, and ether carboxylates are preferred, and higher fatty acid salts are more preferred, from the viewpoints of a good feeling of washing, no residual fragrance after washing, and good density of foam.

[0037] These may be used alone or in combination of two or more.

[0038] The content of the anionic surfactant is not particularly limited and may be appropriately selected depending on the intended purpose. From the viewpoint of improving a feeling of cleansing, preventing residual fragrance after cleansing, and improving the density of foam, the content is preferably from 1.0% by mass to 25% by mass, and more preferably from 3% by mass to 7% by mass, based on the total amount of the liquid skin cleanser composition.

[0039] When the content of (A) is 1.0% by mass or more based on the total amount of the liquid skin cleansing composition, it is preferred because a good cleansing feeling and a dense foam are obtained.

[0040] When the content of (A) is 25% by mass or less based on the total amount of the liquid skin cleansing composition, it is preferred because the feeling of cleansing and the absence of lingering fragrance after cleansing are good.

[0041] -Higher fatty acid salts-

[0042] The higher fatty acid salt is not particularly limited and can be appropriately selected according to the purpose, and examples thereof include laurate, myristate, palmitate, stearate, etc. Among them, laurate, myristate, and palmitate are preferred from the viewpoints of good washing feel, no residual fragrance after washing, and good foam density.

[0043] These may be used alone or in combination of two or more.

[0044] From the viewpoint of improving the retention of the bactericide, the above-mentioned (A) preferably contains one or more selected from palmitic acid salts. In this case, the content of the palmitic acid salt is preferably 0.1% by mass or more and 4% by mass or less, and more preferably 0.4% by mass or more and 1% by mass or less, relative to the total amount of the above-mentioned liquid skin cleanser composition.

[0045] The above-mentioned higher fatty acid salt can use a suitably synthesized higher fatty acid salt, or a commercially available product. As the commercially available product of the higher fatty acid salt, for example, NIKKOL potassium laurate LK-120 (potassium laurate, Nikko Chemicals Co., Ltd. system), NIKKOL potassium myristate MK-140 (potassium myristate, Nikko Chemicals Co., Ltd. system), TAISOAP MNK-40 (coconut oil fatty acid potassium myristate compounding liquid, Nikko Chemicals Co., Ltd. system) etc. can be cited.

[0046] The above-mentioned higher fatty acid salt can also be blended as higher fatty acid salt, but the higher fatty acid and the salt that becomes the counter ion can also be added to the blending tank respectively for neutralization reaction to make the higher fatty acid salt. As the counter ion, there is no particular limitation, and it can be appropriately selected according to the purpose, for example, alkali metal ions, alkanolamines and basic amino acids can be cited.

[0047] Examples of the alkali metal include sodium ions and potassium ions.

[0048] Examples of the alkanolamine include monoethanolamine, diethanolamine, and triethanolamine.

[0049] Examples of the basic amino acid include lysine and arginine.

[0050] The above-mentioned higher fatty acid used in the preparation of the above-mentioned higher fatty acid salt can use the higher fatty acid of suitable synthesis, and also can use commercially available products. As the commercially available products of this higher fatty acid, for example, trade name NAA (registered trademark) -122 (lauric acid, NOF Corporation system), NAA (registered trademark) -142 (myristic acid, NOF Corporation system), NAA (registered trademark) -160 (palmitic acid, NOF Corporation system), NAA (registered trademark) -180 (stearic acid, NOF Corporation system) etc. can be listed.

[0051] -Polyoxyethylene (POE) alkyl ether sulfate-

[0052] The polyoxyethylene (POE) alkyl ether sulfate is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include compounds represented by the following general formula (A1).

[0053] The polyoxyethylene alkyl ether sulfates may be used alone or in combination of two or more.

[0054] R 1 -O(CH2-CH2O) n -SO3X General formula (A1)

[0055] In the general formula (A1), R 1 The alkyl group preferably has 10 to 14 carbon atoms.

[0056] 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.

[0057] In the general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include sodium and potassium.

[0058] Specific examples of the polyoxyethylene (POE) alkyl ether sulfate include polyoxyethylene (1) lauryl ether sodium sulfate, polyoxyethylene (2) lauryl ether sodium sulfate (also known as POE (2) lauryl alcohol polyether sulfate sodium ester), polyoxyethylene (3) lauryl ether sodium sulfate (also known as POE (3) lauryl alcohol polyether sulfate sodium ester), polyoxyethylene (4) lauryl ether sodium sulfate, polyoxyethylene (5) lauryl ether sodium sulfate, polyoxyethylene (3) alkyl (C12,13) ​​ether sodium sulfate, polyoxyethylene (2) lauryl ether ammonium sulfate, polyoxyethylene (3) lauryl ether ammonium sulfate, and the like.

[0059] The numerical values ​​in parentheses above represent the average number of added moles (n) of ethylene oxide (EO).

[0060] The polyoxyethylene alkyl ether sulfate may be a suitably synthesized product or a commercially available product. Examples of commercially available polyoxyethylene alkyl ether sulfates include sodium polyoxyethylene (1) lauryl ether sulfate (trade name: EMAL125A, manufactured by Kao Corporation), sodium polyoxyethylene (2) lauryl ether sulfate (manufactured by Shin Nippon Rika Co., Ltd.), sodium polyoxyethylene (3) lauryl ether sulfate (trade name: EMAL 20C, manufactured by Kao Corporation), ammonium polyoxyethylene (1) lauryl ether sulfate (manufactured by Kao Corporation), and ammonium polyoxyethylene (3) lauryl ether sulfate (manufactured by TAYCA Corporation).

[0061] -Ether carboxylates-

[0062] The ether carboxylate is not particularly limited and may be appropriately selected depending on the intended purpose, and examples thereof include compounds represented by the following general formula (A2) or (A3). The ether carboxylates may be used alone or in combination of two or more.

[0063] R 2 -O-(R 3 O) o -CH2COOM 1 General formula (A2)

[0064]

[0065] In the above 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. 2 The number of carbon atoms in the moiety is preferably 10 to 14.

[0066] In the general formula (A2), R 3 The groups may be the same or different and represent an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms.

[0067] In the general formula (A2), o represents the average number of moles of alkylene oxide added of 1 to 20. The average number of moles of alkylene oxide added is preferably 1 to 5.

[0068] 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.

[0069] Among them, polyoxyalkylene alkyl ether carboxylates are preferred from the viewpoints of good washing feel, no residual fragrance after washing, and good foam density. As the polyoxyalkylene alkyl ether carboxylates, polyoxyethylene (POE) alkyl ether acetate is preferred.

[0070] Specific examples of the ether carboxylate represented by the general formula (A2) or (A3) include polyoxyethylene (3) lauryl ether sodium acetate, polyoxyethylene (4) lauryl ether potassium acetate, and lauryl glycol sodium acetate.

[0071] In addition, the numerical value in the above parentheses represents the average number of moles of alkylene oxide added.

[0072] The ether carboxylates may be appropriately synthesized or commercially available. Examples of commercially available ether carboxylates include, by trade name, ENAGICO LEC-30 (sodium polyoxyethylene (3) lauryl ether acetate, manufactured by Lion Specialty Chemicals Co., Ltd.), BEAULIGHT LCA-25F (sodium polyoxyethylene (3) lauryl ether acetate), BEAULIGHT LCA-30D (sodium polyoxyethylene (3) lauryl ether acetate), BEAULIGHT LCA-H (polyoxyethylene (4) lauryl ether acetic acid), BEAULIGHT LCA-25NH (laureth-4 carboxylic acid), BEAULIGHT SHAA (sodium lauryl glycol carboxylate), BEAULIGHT LCA (sodium polyoxyethylene (3) lauryl ether acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), KAO AKYPO RLM-45NV (sodium polyoxyethylene (4.5) lauryl ether acetate), KAO AKYPO RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (produced by Kao Corporation) and the like.

[0073] In addition, the numerical value in the above parentheses represents the average number of moles of alkylene oxide added.

[0074] -Amino Acid Surfactant-

[0075] The amino acid-based surfactant is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include compounds represented by the following general formula (A4).

[0076] The amino acid-based surfactant may be used alone or in combination of two or more.

[0077]

[0078] In the above 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. 4 The number of carbon atoms in the moiety is preferably 8 to 18.

[0079] In the general formula (A4), R 5 It represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

[0080] In the general formula (A4), R 6 and R 7 Can be the same or different, representing a hydrogen atom or -(CH2) m -COOM 3 .

[0081] In the general formula (A4), m and n may be the same as or different from each other, and represent a number of 0 to 20.

[0082] In the general formula (A4), M 2 and M 3 They may be the same or different and represent a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or a basic amino acid.

[0083] The amino acid structure of the hydrophilic part of the amino acid-based surfactant is not particularly limited and may be appropriately selected depending on the intended purpose, but glycine, glutamic acid, and methylalanine are preferred.

[0084] Specific examples of the amino acid surfactant represented by the general formula (A4) include N-acyl-glycine and salts thereof such as potassium N-cocoyl-glycinate (potassium N-coconut fatty acid acyl glycinate); N-acyl-N-carboxyethyl-glycine and salts thereof such as sodium N-myristoyl-N-carboxyethyl-glycinate; N-acyl-glutamic acid and salts thereof such as sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, potassium N-coconut fatty acid acyl-L-glutamate, sodium N-palmityl fatty acid acyl-L-glutamate, sodium N-stearoyl-L-glutamate; potassium N-lauroyl-N-methyl-β-alanine, etc.

[0085] The amino acid surfactant may be a properly synthesized substance or a commercially available product. Commercially available products of the amino acid surfactant include, for example, Amilite (registered trademark) GCK-11 (N-coconut fatty acid acyl glycine potassium), Amilite (registered trademark) GCK-12K (N-coconut fatty acid acyl glycine potassium), Amilite (registered trademark) GCS-12K (N-coconut fatty acid acyl glycine sodium), Amilite (registered trademark) GCS-11 (N-coconut fatty acid acyl glycine sodium), Amisoft (registered trademark) CS-11 (N-myristoyl-L-glutamate sodium), Amisoft (registered trademark) CS-22 (N-coconut fatty acid acyl glycine sodium), Amilite (registered trademark) CS-23 (N-coconut fatty acid acyl glycine sodium), Amilite (registered trademark) CS-24 (N-coconut fatty acid acyl glycine sodium), Amilite (registered trademark) CS-25 (N-coconut fatty acid acyl glycine sodium), Amilite (registered trademark) CS-26 (N-coconut fatty acid acyl glycine sodium), Amilite (registered trademark) CS-27 (N-coconut fatty acid acyl glycine sodium). Amisoft (registered trademark) HS-11 (sodium N-lauroyl-L-glutamate), Amisoft (registered trademark) LS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) MS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) HS-11P (sodium N-stearoyl-L-glutamate), Amisoft (registered trademark) HS-11P (F) (sodium N-stearoyl-L-glutamate), Amisoft (registered trademark) HS21 (disodium N-stearoyl-L-glutamate), Amilite (registered trademark) ACS-12 (sodium cocoyl alanine) (the above are Ajinomoto Healthy Supply Co., Ltd.), Aminosurfact (registered trademark) AMMS-P1 (sodium N-myristoyl-L-glutamate) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Sarcosinate MN (sodium myristoyl methylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroyl methyl-β-alanine) (all manufactured by Nikko Chemical Co., Ltd.), ALANON ACE (sodium coconut fatty acid methyl alanine), ALANON AME (sodium myristoyl methyl-β-alanine), ALANON ALE (sodium lauroyl methyl-β-alanine) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), ENAGICOL L-30AN (sodium lauroyl methyl-β-alanine) (manufactured by Lion Specialty Chemicals Co., Ltd.), SOFTIL AT-L (sodium lauroyl methyl-β-alanine) (manufactured by NOF Corporation), etc.

[0086] <(B) Phosphate>

[0087] The above-mentioned phosphate is blended in order to improve the cleaning performance.

[0088] The phosphate (B) is not particularly limited and can be appropriately selected according to the purpose, and examples thereof include potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate, potassium polyphosphate, sodium polyphosphate, sodium pyrophosphate, sodium dihydrogen phosphate, sodium phosphate, sodium tripolyphosphate, disodium hydrogen phosphate, and calcium hydrogen phosphate, etc. Among these, potassium dihydrogen phosphate is preferred from the viewpoint of improving the washing feel and the density of the foam.

[0089] These may be used alone or in combination of two or more.

[0090] The content of the phosphate (B) is not particularly limited and may be appropriately selected depending on the intended purpose. From the viewpoint of improving the cleansing feel and the density of the foam, the content is preferably from 0.05% by mass to 5% by mass, more preferably from 0.2% by mass to 1.0% by mass, based on the total amount of the liquid skin cleanser composition.

[0091] When the content of the phosphate (B) is 0.05% by mass or more based on the total amount of the liquid skin cleansing composition, it is preferred because a good cleansing feeling and a thick foam are obtained.

[0092] When the content of the phosphate (B) is 5% by mass or less based on the total amount of the liquid skin cleansing composition, a good cleansing feeling is obtained, which is preferred.

[0093] As the phosphate (B), a suitably synthesized phosphate may be used, or a commercially available product may be used. Commercially available products of the phosphate (B) include, for example, potassium dihydrogen phosphate (trade name: monopotassium phosphate, manufactured by Taihei Chemical Industry Co., Ltd.), dipotassium hydrogen phosphate (trade name: dipotassium phosphate, manufactured by Taihei Chemical Industry Co., Ltd.), potassium tripolyphosphate (trade name: potassium tripolyphosphate, manufactured by Taihei Chemical Industry Co., Ltd.), sodium tripolyphosphate (trade name: sodium tripolyphosphate, manufactured by Taihei Chemical Industry Co., Ltd.), sodium dihydrogen phosphate (trade name: monosodium phosphate (anhydrous), manufactured by Taihei Chemical Industry Co., Ltd.), and sodium phosphate (trade name: trisodium phosphate (anhydrous), manufactured by Taihei Chemical Industry Co., Ltd.).

[0094] <(C) Fungicide>

[0095] The above-mentioned (C) bactericide is blended in order to improve the cleaning effect.

[0096] The bactericide (C) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include isopropylmethylphenol, salicylic acid, triclosan, benzalkonium chloride, and cetylpyridinium chloride, etc. Among them, isopropylmethylphenol is preferred from the viewpoint of good cleaning performance.

[0097] The content of the bactericidal agent (C) is not particularly limited and may be appropriately set depending on the purpose. From the viewpoint of cleansing performance, it is preferably 0.05 mass % to 1.0 mass % based on the total amount of the liquid skin cleanser composition, and more preferably 0.05 mass % to 0.4 mass % .

[0098] When the content of the bactericidal agent (C) is 0.05% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleanser composition, a good cleansing feeling is obtained, which is preferred.

[0099] The bactericide (C) may be a properly synthesized bactericide or a commercially available product. Examples of commercially available bactericides include isopropylmethylphenol (trade name: BIOSOL (registered trademark), manufactured by Osaka Chemical Industry Co., Ltd.), salicylic acid (trade name: Salicylic acid, manufactured by API Corporation), benzalkonium chloride (trade name: Cationic G-50, manufactured by Sanyo Chemical Industries, Ltd.), and cetylpyridinium chloride (trade name: cetylpyridinium chloride (CPC), manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.).

[0100] <(D) Monoethanolamine>

[0101] As described above, the liquid skin cleansing composition of the present invention may contain (D) monoethanolamine as necessary. The (D) monoethanolamine is blended to improve the cleansing feel and prevent the fragrance from remaining after cleansing.

[0102] The content of the monoethanolamine (D) is not particularly limited and may be appropriately set depending on the intended purpose. From the viewpoint of a positive cleaning feeling and no residual fragrance after cleaning, the content is preferably 0.3% by mass to 3.0% by mass, and more preferably 0.6% by mass to 2.0% by mass, based on the total amount of the liquid skin cleanser composition.

[0103] When the content of the (D) monoethanolamine is 0.3% by mass or more based on the total amount of the liquid skin cleansing composition, it is preferred because the fragrance does not remain after cleansing.

[0104] When the content of the (D) monoethanolamine is 3.0% by mass or less based on the total amount of the liquid skin cleansing composition, a good cleansing feeling is obtained, which is preferred.

[0105] The monoethanolamine (D) may be a suitably synthesized product or a commercially available product. Examples of the commercially available monoethanolamine (D) include monoethanolamine (manufactured by Nippon Shokubai Co., Ltd.).

[0106] <(E)Spice>

[0107] As described above, the liquid skin cleansing composition of the present invention may contain (E) a fragrance as necessary. The (E) fragrance is blended for the purpose of adding fragrance.

[0108] The (E) fragrance is not particularly limited and can be appropriately selected depending on the purpose. For example, fragrances described in JP-A-2002-128658, fragrances described in JP-A-2003-73249, or blended fragrance compositions described in JP-A-2020-132680 can be used.

[0109] The content of the fragrance (E) is not particularly limited and may be appropriately set depending on the purpose. From the viewpoint of preventing residual fragrance after washing, it is preferably from 0.05% by mass to 2.0% by mass, more preferably from 0.1% by mass to 1.0% by mass, based on the total amount of the liquid skin cleanser composition.

[0110] When the content of the fragrance (E) is 2.0% by mass or less based on the total amount of the liquid skin cleansing composition, it is preferred because the fragrance does not remain after washing.

[0111] <(F) Copolymer containing dimethyldiallylammonium chloride and at least one of acrylic acid and acrylamide as a monomer unit>

[0112] The component (F) is blended to enhance the cleaning feel.

[0113] The component (F) is preferably a copolymer of (F1) dimethyldiallylammonium chloride and (F2) acrylic acid and / or acrylamide. More specifically, the copolymer of the component (F) is preferably a copolymer represented by the following general formula (2).

[0114]

[0115] In the above general formula (2), n, m and z represent the molar ratio of each monomer unit, and n+m+z=100. In addition, n and z are not 0 at the same time.

[0116] The molar ratio of the dimethyldiallylammonium chloride (F1) in the copolymer (F) is not particularly limited and may be appropriately set depending on the purpose. From the viewpoint of improving the cleaning feel, it is preferably 10 mol % to 95 mol %, and more preferably 20 mol % to 50 mol %.

[0117] In addition, the ratio of each monomer in the said (F) component can be determined by measuring it by nuclear magnetic resonance (NMR) under the following measurement conditions.

[0118] [Measurement conditions]

[0119] Solvent: Heavy water (D2O)

[0120] Measuring instrument: JNM-LA300 (300 MHz, manufactured by JEOL Ltd.)

[0121] The content of the component (F) is not particularly limited and may be appropriately set depending on the intended purpose. From the viewpoint of a good cleansing feel and a dense foam, the content is preferably 0.01% by mass to 0.5% by mass, more preferably 0.01% by mass to 0.1% by mass, based on the total amount of the liquid skin cleanser composition.

[0122] When the content of the component (F) is 0.01% by mass or more based on the total amount of the liquid skin cleansing composition, a good cleansing feeling is obtained, which is preferred.

[0123] When the content of the component (F) is 0.1% by mass or less based on the total amount of the liquid skin cleansing composition, it is preferred because a good cleansing feeling and a thick foam are obtained.

[0124] As the copolymer of the component (F), a properly synthesized copolymer or a commercially available product may be used. As the commercially available product of the component (F), for example, the following commercially available products may be listed. It should be noted that they may be used alone or in combination of two or more.

[0125] -MERQUAT 280-

[0126]

[0127] The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. using a spindle No. 4 rotor and at 60 rpm.

[0128] -MERQUAT 295-

[0129]

[0130] The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. using a spindle No. 4 rotor and at 30 rpm.

[0131] -MERQUAT 550PR-

[0132]

[0133] The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. using a spindle No. 4 rotor and at 10 rpm.

[0134] -MERQUAT 740-

[0135]

[0136] The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. using a spindle No. 3 rotor and at 10 rpm.

[0137] [Mass ratio (B) / (C)]

[0138] In this specification, "the mass ratio of the content of (B) above to the content of (C) above" may be referred to as "mass ratio (B) / (C)".

[0139] The mass ratio (B) / (C) is not particularly limited and may be appropriately set depending on the intended purpose, but is preferably 1 to 10, more preferably 2 to 3, from the viewpoint of a sense of washing.

[0140] By setting the mass ratio (B) / (C) to 1 or more and 10 or less, a good washing feeling is obtained, which is preferable.

[0141] [Mass ratio (D) / (A)]

[0142] In this specification, "the mass ratio of the content of the above-mentioned (D) to the content of the above-mentioned (A)" may be referred to as "mass ratio (D) / (A)".

[0143] The mass ratio (D) / (A) is not particularly limited and may be appropriately set depending on the purpose, but is preferably 0.08 to 0.5, more preferably 0.2 to 0.4, from the viewpoint of a sense of wash and lack of fragrance after wash.

[0144] When the mass ratio (D) / (A) is 0.08 or more, the feeling of washing and the absence of residual fragrance after washing are good, which is preferred.

[0145] By setting the mass ratio (D) / (A) to be 0.5 or less, a good washing feeling is obtained, which is preferred.

[0146] <Other ingredients>

[0147] The liquid skin cleanser composition of the present invention may contain, in addition to the above-mentioned components (A), (B), (C), (D), (E) and (F), components commonly used in liquid skin cleanser compositions as other components as necessary, within the range not impairing the effects of the present invention.

[0148] The above-mentioned other components are not particularly limited and can be appropriately selected according to the purpose. For example, surfactants other than the above-mentioned component (A), water-soluble polymers other than the above-mentioned component (F), oils, silicones, alcohols, lanolin derivatives, protein derivatives, amino acids, vitamins and other drugs, preservatives, pH adjusters, antioxidants, metal blocking agents, animal and plant extracts or derivatives thereof, chelating agents, humectants, thickeners, ultraviolet absorbers or scattering agents, pigments, pigments, water-insoluble polymer powders, etc. can be mentioned.

[0149] There are no particular restrictions on the oil component and it can be appropriately selected according to the purpose. For example, there can be mentioned plant oils and fats such as castor oil, olive oil, cocoa butter, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grape seed oil, avocado oil and their ester compounds; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, spermaceti, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin, and vaseline; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; esters such as tri-2-ethylhexanoin, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate, etc.

[0150] These may be used alone or in combination of two or more.

[0151] The content of the oil component is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.1% by mass or more and 3% by mass or less based on the total amount of the liquid skin cleansing composition.

[0152] There is no particular limitation on the alcohols, and they can be appropriately selected according to the purpose, and can be either a lower alcohol or a higher alcohol. Specific examples of the alcohols include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol.

[0153] These may be used alone or in combination of two or more.

[0154] The content of the alcohol is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01% by mass or more and 15% by mass or less based on the total amount of the liquid skin cleansing composition.

[0155] The moisturizing agent is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include isoprene glycol, propylene glycol, glycerin, sorbitol, 1,3-butylene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerol, triglycerol, polyglycerol, and the like.

[0156] These may be used alone or in combination of two or more.

[0157] The content of the moisturizing agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01% by mass or more and 10.0% by mass or less based on the total amount of the liquid skin cleansing composition.

[0158] The thickener is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include natural polymers such as sodium alginate, xanthan gum, aluminum silicate, quince seed extract, tragacanth gum, and starch; semi-synthetic polymers such as methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and soluble starch; and synthetic polymer compounds such as carboxyvinyl polymers, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, and methacryloylethyl betaine methacrylate copolymer.

[0159] These may be used alone or in combination of two or more.

[0160] The content of the thickener is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleansing composition.

[0161] The preservative is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include benzoates, sorbates, dehydroacetates, p-hydroxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone / methylisothiazolinone liquid (trade name: Kathon CG, manufactured by Rohm & Haas Japan KK), salicylic acid, pentylene glycol, phenoxyethanol, ethanol, and the like.

[0162] These may be used alone or in combination of two or more.

[0163] The content of the preservative is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleansing composition.

[0164] The antioxidant is not particularly limited and may be appropriately selected depending on the intended purpose. Examples of the antioxidant include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid.

[0165] These may be used alone or in combination of two or more.

[0166] The content of the antioxidant is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.001 mass % or more and 1.0 mass % or less based on the total amount of the liquid skin cleansing composition.

[0167] The chelating agent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include edetic acid, edetate disodium, edetate, hexametaphosphate, and gluconic acid.

[0168] These may be used alone or in combination of two or more.

[0169] The content of the chelating agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.001 mass % or more and 5.0 mass % or less based on the total amount of the liquid skin cleansing composition.

[0170] The pH adjuster is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, ammonia water, triisopropanolamine, phosphoric acid, glycolic acid, and hydrochloric acid.

[0171] These may be used alone or in combination of two or more.

[0172] The ultraviolet absorber or scatterer is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl p-aminobenzoate, ethylhexyl p-methoxycinnamate, titanium oxide, kaolin, and talc.

[0173] These may be used alone or in combination of two or more.

[0174] The content of the ultraviolet absorber or scatterer is not particularly limited, but is preferably 0.01% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleansing composition.

[0175] The vitamins are not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include vitamin A, B vitamins, vitamin C, 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.

[0176] These may be used alone or in combination of two or more.

[0177] The content of the vitamins is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleansing composition.

[0178] The amino acid is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and derivatives thereof.

[0179] These may be used alone or in combination of two or more.

[0180] The content of the amino acids is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleansing composition.

[0181] The water-insoluble polymer compound is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include inorganic powders, clay minerals, nylon, polyethylene, and the like.

[0182] These may be used alone or in combination of two or more.

[0183] The content of the water-insoluble polymer compound powder is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.1% by mass or less based on the total amount of the liquid skin cleansing composition.

[0184] As the other components, those synthesized as appropriate may be used, or commercial products may be used.

[0185] The content of the other components relative to the total amount of the liquid skin cleansing composition is not particularly limited and may be appropriately selected depending on the intended purpose.

[0186] -pH-

[0187] The pH of the liquid skin cleansing composition at 25° C. is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 9.5 to 11.0, more preferably 9.8 to 10.6.

[0188] When an anionic surfactant other than a higher fatty acid salt is used as the component (A), the pH of the liquid skin cleansing composition at 25° C. is preferably 4.0 to 7.0, more preferably 4.0 to 5.0.

[0189] The pH can be measured, for example, using a glass electrode colorimetric hydrogen ion concentration indicator HM-30R (electrode type GST-5721 manufactured by TOA DKK Co., Ltd.).

[0190] -Viscosity-

[0191] The viscosity of the liquid skin cleanser composition at 25°C is 150 mPa·s or less. In terms of a good cleansing feel, no residual fragrance after cleansing, and good foam density, the viscosity of the liquid skin cleanser composition at 25°C is preferably 90 mPa·s or less, and more preferably 50 mPa·s or less.

[0192] The viscosity can be measured, for example, by measuring the viscosity after 1 minute at a sample temperature of 25° C. using a BM type viscometer (manufactured by Tokyo Keiki Co., Ltd.) with a rotation speed of 60 rpm and a No. 1 rotor.

[0193] -container-

[0194] The liquid skin cleansing composition of the present invention is not particularly limited, and is filled in a common container for use.

[0195] The container is not particularly limited and may be appropriately selected depending on the intended purpose, and examples thereof include a pump dispenser container, a tube, a foamer container, and a bag-like container, etc. Among them, a foamer container is preferred.

[0196] The foaming container is not particularly limited and can be appropriately selected from known foaming containers, such as non-gas foam discharge containers, aerosol containers using propellants and pressure-resistant containers, etc. Among them, non-gas foam discharge containers are preferred.

[0197] As the above-mentioned non-gas type foam discharge container, there is no particular limitation as long as it can mix the above-mentioned liquid skin cleanser composition with air and discharge it in a foamed state, and it can be appropriately selected according to the purpose, for example, it can be mentioned: a squeeze foaming container that can discharge foam by squeezing the bottle body by hand, a pump foaming container that can discharge foam by pressing down the nozzle, etc. Such a foaming container can use a container made by Yamato Can Co., Ltd., Yoshino Industry Co., Ltd., etc. More specifically, as a foaming container, a foaming container described in Japanese Patent Laid-Open No. 7-315463, Japanese Patent Laid-Open No. 8-230961, and Japanese Patent Laid-Open No. 2005-193972 can be used.

[0198] The non-gas type foam discharge container has a foam forming member, specifically, a porous membrane for forming foam (preferably made of plastic materials such as nylon, polyester, polyolefin, etc.), and the liquid skin cleansing composition forms foam through the porous membrane.

[0199] The mesh of the porous membrane is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 100 mesh or larger, more preferably 100 to 400 mesh, and particularly preferably 200 to 305 mesh.

[0200] The number of the porous membranes is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 2 to 4 in terms of improving foaming performance.

[0201] -Manufacturing method-

[0202] The method for producing the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the intended purpose. For example, the composition can be obtained by mixing the component (A), the component (B), the component (C), the component (D), the component (E), the component (F), and the other components as required, with purified water (mixed as the remainder so that the total amount of the liquid skin cleanser composition becomes 100% by mass).

[0203] Specifically, the above-mentioned (A) anionic surfactant, (B) phosphate, (C) bactericide, (D) monoethanolamine, and potassium hydroxide as other components are dissolved in purified water heated to 70°C to 80°C, and after cooling to 40°C or lower, the above-mentioned (E) fragrance and the above-mentioned (F) copolymer are added and dissolved.

[0204] The liquid skin cleanser composition can be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected according to the purpose, and examples thereof include a stirring apparatus equipped with a stirring blade having a shearing force and capable of mixing the entire composition.

[0205] The stirring blade is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a propeller, a turbine, and a disperser.

[0206] -use-

[0207] The application site of the liquid skin cleansing composition is not particularly limited and can be appropriately selected depending on the intended purpose. For example, the composition can be applied to the whole body, face, hands, and the like.

[0208] The method for using the liquid skin cleanser composition is not particularly limited and may be appropriately selected depending on the intended purpose. The composition is preferably filled in a foaming container and discharged in a foaming state for use.

[0209] The liquid skin cleanser composition has good foaming properties (density of foam) and excellent washing feel, and therefore can be used, for example, in body shampoo, body soap, facial cleanser, hand soap, foam hand soap, facial cleansing foam, makeup remover, etc., and is particularly suitable for use in body soap.

[0210] Example

[0211] The present invention is specifically described below by way of examples and comparative examples, but the present invention is not limited by these examples. The content of each component described in the examples and comparative examples is expressed as "mass %", the total amount being 100 mass %, and all are values ​​converted to pure components.

[0212] (Example 1 to Example 23 and Comparative Example 1 to Comparative Example 4)

[0213] Liquid skin cleanser compositions of the composition and content shown in Examples 1 to 23 and Comparative Examples 1 to 4 were prepared by the following method. Specifically, a mixture of purified water, propylene glycol, etc. as other components was prepared in an amount of 60% by mass of the total amount of the final liquid skin cleanser composition. The mixture of other components was heated to 70°C to 80°C, and (A) anionic surfactant, (B) phosphate, (C) bactericide, (D) monoethanolamine, and potassium hydroxide as other components were dissolved. Then, the mixture was cooled to 40°C or less, and (E) fragrance and (F) dimethyldiallylammonium chloride-acrylamide copolymer liquid were added and dissolved. Then, when the prescribed pH was not satisfied, potassium hydroxide as a common component was added, and after adjusting the pH to 10, purified water was added so that the total amount became 100% by mass, to obtain the liquid skin cleanser compositions of Examples and Comparative Examples.

[0214] In addition, mixing of each component was performed by stirring using a propeller as a stirring blade and a Three-One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.).

[0215] In addition, pH was measured at 25 degreeC using the pH meter (HM-30R, manufactured by TOA DKK Co., Ltd.).

[0216] The viscosity of the obtained liquid skin cleanser composition was measured at 25°C using a BM viscometer (manufactured by Tokyo Keiki Co., Ltd.) at 25°C and a No. 1 spindle rotor at 60 rpm for 1 minute.

[0217] Furthermore, each of the obtained liquid skin cleansing compositions of Examples 1 to 23 and Comparative Examples 1 to 4 was filled in a container with a foaming pump dispenser [discharge volume 1 mL, manufactured by Yoshino Industries, Ltd.].

[0218] For each liquid skin cleansing composition, "cleansing feel", "richness of foam", "no lingering fragrance after washing" and "retention of disinfectant" were evaluated and judged as follows.

[0219] The results are shown in Tables 1 to 6 below.

[0220] <Real feeling of cleaning>

[0221] Ten professional evaluators evaluated the cleaning feeling of taking 2 pumps (about 2 g) of each liquid skin cleanser composition on their hands, foaming, and washing at a speed of 2 times per second based on the following evaluation criteria. The average score of the 10 was calculated and judged based on the following judgment criteria of the average score. In addition, "0" or above was considered as passing.

[0222] -Evaluation Criteria-

[0223] 5 points: Very strong feeling of refreshing

[0224] 4 points: Strong sense of refreshment

[0225] 3 points: Feeling refreshed

[0226] 2 points: Slightly refreshing

[0227] 1 point: Not refreshing

[0228] -Judgment Criteria-

[0229] ◎◎: 4.5 points or more

[0230] ◎: 4.0 points or more and less than 4.5 points

[0231] ○: 3.0 points or more and less than 4.0 points

[0232] △: 2.0 points or more and less than 3.0 points

[0233] ×: Less than 2.0 points

[0234] <Density of foam>

[0235] Ten professional testers took 2 pumps (about 2 g) of each liquid skin cleanser composition on their hands, observed the rebounding feel when the bubbles were pressed against each other when wiping 10 times with both hands, and the non-drip properties when the hands were tilted 45 degrees, and evaluated based on the following evaluation criteria. The results were averaged, and the evaluation was based on the following evaluation criteria for the average score. In addition, "△" or above was considered qualified.

[0236] -Evaluation Criteria-

[0237] 4 points: The foam is hard and does not drip even if the hand is tilted

[0238] 3 points: The bubble is slightly hard and does not drip even if the hand is tilted

[0239] 2 points: The foam is slightly soft and tends to drip slightly when the hand is tilted

[0240] 1 point: The foam is soft and drips when the hand is tilted

[0241] -Judgment Criteria-

[0242] ◎:3.5 points or more

[0243] ○: 3.0 points or more and less than 3.5 points

[0244] △: 2.0 points or more and less than 3.0 points

[0245] ×: Less than 2.0 points

[0246] <Evaluation method for no residual fragrance after washing>

[0247] After the above-mentioned evaluation of the actual feeling of cleaning of each liquid skin cleanser composition, the same evaluation personnel immediately smelled the fragrance remaining on the hands, and evaluated the fragrance remaining on the hands according to the following evaluation criteria. The average score of the 10 people was calculated, and the judgment was made based on the judgment criteria of the following average score. In addition, "△" or above was considered as passing.

[0248] -Evaluation Criteria-

[0249] 5 points: No fragrance remains on hands

[0250] 4 points: The fragrance hardly remains on the hands

[0251] 3 points: The fragrance remains on your hands

[0252] 2 points: The fragrance remains strongly on the hands

[0253] 1 point: The fragrance is very strong and remains on the hands

[0254] -Judgment Criteria-

[0255] ◎:4.0 points or above

[0256] ○: 3.0 points or more and less than 4.0 points

[0257] △: 2.0 points or more and less than 3.0 points

[0258] ×: Less than 2.0 points

[0259] <Retention of sterilizing ingredients after cleaning>

[0260] After applying about 100 μL of each liquid skin cleanser composition to the model skin (VITRO-SKIN, 5×5), the skin was immersed in 20 mL of water for 5 seconds and dried naturally for 1 to 2 hours. Methanol was added to the model skin, and the solution obtained by ultrasonic treatment was filtered with a 0.45 μm filter, and the content of the bactericide was measured by liquid chromatography. The content of the bactericide in the liquid skin cleanser composition was set to 100, and the retention rate (%) of the bactericide was calculated, and the evaluation was performed based on the following evaluation criteria.

[0261] -Judgment Criteria-

[0262] ◎: Retention rate is more than 30%

[0263] ○: The retention rate is 20% or more and less than 30%

[0264] △: The retention rate is 10% or more and less than 20%

[0265] ×: Retention rate is less than 10%

[0266] [Table 1]

[0267]

[0268] [Table 2]

[0269]

[0270] [Table 3]

[0271]

[0272] [Table 4]

[0273]

[0274] [Table 5]

[0275]

[0276] [Table 6]

[0277]

[0278] (Formulation Example 1 to Formulation Example 6)

[0279] By the same method as in Example 1, a liquid skin cleansing composition having the composition and content shown in Table 7 below was prepared.

[0280] [Table 7]

[0281]

[0282] The details of the components used in Examples 1 to 23, Comparative Examples 1 to 4, and Formulation Examples 1 to 6 are shown in Table 8 below.

[0283] [Table 8]

[0284]

[0285] *1: Potassium myristic acid was prepared by neutralizing myristic acid (NAA-142, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Corporation).

[0286] *2: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Corporation).

[0287] *3: Potassium palmitate was prepared by neutralizing palmitic acid (NAA-160, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Corporation).

[0288] *4: Potassium stearate was prepared by neutralizing stearic acid (NAA-180, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Corporation).

[0289] Industrial Applicability

[0290] The liquid skin cleanser composition has good foaming properties (density of foam) and excellent cleansing feel, and therefore can be used, for example, in body washes, bath soaps, facial cleansers, hand soaps, foam hand soaps, facial cleansing foams, makeup removers, and is particularly suitable for body washes.

[0291] This international application claims the benefit of priority based on Japanese Patent Application No. 2022-207770 filed on December 26, 2022, the entire contents of which are incorporated herein by reference.

Claims

1. A liquid skin cleanser composition, characterized in that The skin cleansing composition comprises (A) an anionic surfactant, (B) a phosphate and (C) a bactericide, and has a viscosity at 25° C. of 150 mPa·s or less.

2. The liquid skin cleanser composition according to claim 1, wherein The mass ratio of the content of the (B) to the content of the (C) [(B) / (C)] is 1 or more and 10 or less.

3. The liquid skin cleanser composition according to claim 1 or 2, wherein The component (A) contains palmitate.

4. The liquid skin cleanser composition according to any one of claims 1 to 3, further comprising (D) monoethanolamine and (E) fragrance, wherein the mass ratio of the content of (D) to the content of (A) [(D) / (A)] is 0.08 or more and 0.5 or less.

5. The liquid skin cleanser composition according to any one of claims 1 to 4, wherein The content of (A) is 1% by mass or more and 25% by mass or less, the content of (B) is 0.05% by mass or more and 5% by mass or less, and the content of (C) is 0.05% by mass or more and 1% by mass or less, based on the total amount of the liquid skin cleanser composition. 6 . The liquid skin cleansing composition according to claim 1 , which is filled in a foaming container.

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