Skin cleansing composition

Abstract

To provide a skin cleansing composition that keeps foam well, and makes the skin moist, not causing the itching after towel dry, while the composition is stable at low temperatures and keeps a transparent appearance.SOLUTION: A skin cleansing composition comprises (A) an anionic surfactant comprising at least one of palmitate and stearate, (B) a cationic polymer comprising a structural unit derived from dimethyldiallylammonium chloride at a molar ratio of 40% or more, and (C) (c1) alkyl amine oxide, (c2) sorbitan fatty acid ester, and (c3) polyethylene glycol fatty acid ester.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a skin cleansing composition.

Background Art

[0002] Conventionally, skin cleansing compositions such as body soaps and hand soaps are required to have good foaming performance such as foam retention, and to impart a moist feeling to the skin after washing. In addition, most consumers used to wash their bodies by including liquid body soap in cleaning tools such as nylon towels and cotton towels. In recent years, however, the demand for uses such as washing the body by including foamed body soap discharged from a former container or the like in a cleaning tool has been increasing.

[0003] When washing the body by including foamed detergent discharged from a former container or the like in a cleaning tool, the compatibility between foaming performance (foam retention) and low-temperature stability was not sufficiently satisfactory. In addition, in detergents, in order to improve foam retention, it is generally known that more long-chain fatty acids such as palmitic acid and stearic acid are added. However, when the ratio of long-chain fatty acids in the detergent is increased, the fatty acids may precipitate at low temperatures, the transparent appearance may not be maintained, the dischargeability from a former container or the like may deteriorate, or itching may occur on the skin after towel drying.

[0004] As a technique for improving solubility at low temperatures, an alkyl sulfobetaine type surfactant, a linear fatty acid alkanolamide type surfactant, a detergent containing fatty acids, etc. have been proposed (for example, see Patent Document 1). However, in the case of the detergent in Patent Document 1, the foam retention and the moist feeling of the skin after towel drying may be reduced, and the low-temperature stability is not sufficient.

[0005] Therefore, there has not yet been provided a skin cleansing composition that ensures foaming and a lack of itchiness and a moist feeling of the skin after towel drying, has excellent low-temperature stability, and maintains a transparent appearance, and there is currently a strong desire for its prompt development.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] An object of the present invention is to solve the above-described various problems of the prior art and achieve the following object. That is, an object of the present invention is to provide a skin cleansing composition that ensures foaming and a lack of itchiness and a moist feeling of the skin after towel drying, has excellent low-temperature stability, and maintains a transparent appearance.

Means for Solving the Problems

[0008] As a result of intensive studies to achieve the above object, the inventors of the present invention have found that the skin cleansing composition of the present invention contains (A) an anionic surfactant containing at least one of palmitate and stearate, (B) a cationic polymer having a molar ratio of structural units derived from dimethyldiallylammonium chloride of 40% or more, and (C) (c1) an alkylamine oxide, (c2) a sorbitan fatty acid ester, and (c3) a polyethylene glycol fatty acid ester, and thereby can ensure foaming and a lack of itchiness and a moist feeling of the skin after towel drying, has excellent low-temperature stability, and maintains a transparent appearance.

[0009] The present invention is based on the above findings by the inventors of the present invention, and means for solving the above problems are as follows. <1>An anionic surfactant containing at least one of palmitate and stearate, and (B) a cationic polymer in which the molar ratio of structural units derived from dimethyldiallylammonium chloride is 40% or more, and (C) (c1) an alkylamine oxide, (c2) a sorbitan fatty acid ester, and (c3) a polyethylene glycol fatty acid ester, and a skin cleansing composition characterized by containing the same. <2>The skin cleansing composition according to <1> above, wherein the mass ratio [(A) / (C)] of the content of the component (A) to the content of the component (C) is 3.5 or more and 9 or less. <3>The content of the component (A) is 12% by mass or more and 22% by mass or less with respect to the total amount of the skin cleansing composition, the content of the component (B) is 0.2% by mass or more and 0.8% by mass or less with respect to the total amount of the skin cleansing composition, and the content of the component (C) is 0.9% by mass or more and 7.5% by mass or less with respect to the total amount of the skin cleansing composition. The skin cleansing composition according to any one of <1> to <2> above. <4>The skin cleansing composition according to any one of <1> to <3> above, wherein the component (C) is (c1) dihydroxyethyl lauramine oxide, (c2) sorbitan isostearate, and (c3) polyethylene glycol monoisostearate. <5>The skin cleansing composition according to any one of <1> to <4> above, which is filled in a former container. [Effects of the Invention]

[0010] According to the present invention, the above-mentioned various problems in the prior art can be solved, the above-mentioned object can be achieved, and while ensuring foaming and the absence of itching and moist feeling of the skin after towel drying, a skin cleansing composition excellent in low-temperature stability and maintaining a transparent appearance can be provided. [Modes for Carrying Out the Invention]

[0011] (Skin Cleansing Composition) The skin cleansing agent composition of the present invention contains (A) an anionic surfactant containing at least one of palmitate and stearate, (B) a cationic polymer in which the molar ratio of the structural units derived from dimethyldiallylammonium chloride is 40% or more, and (C) (c1) an alkylamine oxide, (c2) a sorbitan fatty acid ester, and (c3) a polyethylene glycol fatty acid ester, and may contain other components as necessary. In the present specification, the anionic surfactant containing at least one of (A) palmitate and stearate may be referred to as the “component (A)” or “(A) anionic surfactant”, and the cationic polymer in which the molar ratio of the structural units derived from dimethyldiallylammonium chloride is 40% or more may be referred to as the “component (B)” or “(B) cationic polymer”, and (C) (c1) an alkylamine oxide, (c2) a sorbitan fatty acid ester, and (c3) a polyethylene glycol fatty acid ester may be referred to as the “component (C)”.

[0012] <(A) Anionic surfactant> The (A) anionic surfactant in the present invention contains at least one of palmitate and stearate, and may contain an anionic surfactant other than palmitate and stearate as necessary. The (A) anionic surfactant is mainly contained to improve foaming. In the present specification, “foaming” means that the foam is maintained without disappearing.

[0013] The anionic surfactant other than palmitate and stearate is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of improving foaming, higher fatty acid salts other than palmitate and stearate, polyoxyethylene (POE) alkyl ether sulfates, ether carboxylates, and amino acid-based surfactants are preferred, and higher fatty acid salts other than palmitate and stearate are more preferred. These may be used alone or in combination of two or more. In the present specification, the "higher fatty acid salts other than palmitate and stearate" may be referred to as "other higher fatty acid salts". Further, in the present specification, when simply denoted as "higher fatty acid salts", it indicates all of palmitate, stearate, and other higher fatty acid salts.

[0014] -Other higher fatty acid salts- The other higher fatty acid salts in the component (A) are not particularly limited and can be appropriately selected according to the purpose. Examples thereof include laurate, myristate, and the like. These may be used alone or in combination of two or more.

[0015] From the viewpoint of improving foaming property, the component (A) in the skin cleansing composition of the present invention is preferably a higher fatty acid salt containing any of laurate, myristate, palmitate, and stearate.

[0016] The counter ion in the higher fatty acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include alkali metal salts, amine salts, amino acid salts, and the like. The alkali metal salt is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include sodium salt, potassium salt, and the like. The amine salt is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include ammonium salt, monoethanolamine salt, diethanolamine salt, triethanolamine salt, alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol, and the like. The amino acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include lysine salt, arginine salt, and the like. Among these, alkali metal salts are preferable, and potassium salts are more preferable in terms of excellent foaming property.

[0017] As for the above-mentioned higher fatty acid salt, a commercially available product may be used, or a product synthesized as appropriate may be used. There is no particular limitation on the method for synthesizing the above-mentioned higher fatty acid salt, and it can be appropriately selected according to the purpose. For example, the fatty acid salt obtained by a conventional method may be directly blended, or in the blending process of the skin cleansing agent composition, the higher fatty acid and the salt serving as the counter ion such as potassium hydroxide may be separately added into the blending tank and neutralized to synthesize the higher fatty acid salt. In addition, as for the higher fatty acid used for the preparation of the above-mentioned higher fatty acid salt, a product synthesized as appropriate may be used, or a commercially available product may be used.

[0018] Examples of the commercially available products of the above-mentioned higher fatty acid salt include, for example, under the trade names, Non-Sal PK-1 (potassium palmitate), Non-Sal SK-1 (potassium stearate) (both manufactured by NOF Corporation), NIKKOL Potassium Laurate LK-120 (potassium laurate), NIKKOL Potassium Myristate MK-140 (potassium myristate), Tyson Soap MNK-40 (liquid containing a blend of potassium coconut fatty acid and potassium myristate) (all manufactured by Nikko Chemicals Co., Ltd.), etc.

[0019] There is no particular limitation on the content of the above-mentioned palmitate, and it can be appropriately selected according to the purpose. However, based on the total amount of the skin cleansing agent composition, 1% by mass or more and 10% by mass or less is preferable, and 3% by mass or more and 9% by mass or less is more preferable. There is no particular limitation on the content of the above-mentioned stearate, and it can be appropriately selected according to the purpose. However, based on the total amount of the skin cleansing agent composition, 0.1% by mass or more and 3% by mass or less is preferable, and 0.2% by mass or more and 1% by mass or less is more preferable.

[0020] - Polyoxyethylene (POE) alkyl ether sulfate - There is no particular limitation on the polyoxyethylene alkyl ether sulfate in the component (A), and it can be appropriately selected according to the purpose. For example, compounds represented by the following general formula (A1) etc. may be mentioned. The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more kinds.

[0021]

Chemical formula

[0022] Specific examples of the polyoxyethylene alkyl ether sulfate include sodium polyoxyethylene (1) lauryl ether sulfate, sodium polyoxyethylene (2) lauryl ether sulfate (alias: sodium POE(2) lauryl sulfate), sodium polyoxyethylene (3) lauryl ether sulfate (alias: sodium POE(3) lauryl sulfate), sodium polyoxyethylene (4) lauryl ether sulfate, sodium polyoxyethylene (5) lauryl ether sulfate, sodium polyoxyethylene (3) alkyl (C12,13) ether sulfate, ammonium polyoxyethylene (2) lauryl ether sulfate, ammonium polyoxyethylene (3) lauryl ether sulfate, etc. Note that the numerical value in the () represents the average number of moles of ethylene oxide (E.O.) added (n).

[0023] 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, for example, Texapon (registered trademark) N70 (sodium polyoxyethylene (2) lauryl ether sulfate) (manufactured by BASF) and Shinorin SPE-1250 (sodium polyoxyethylene (2) lauryl ether sulfate) (manufactured by Shin Nippon Rika Co., Ltd.).

[0024] - Ether carboxylate - The ether carboxylate in the component (A) is not particularly limited and can be appropriately selected according to the purpose. Examples include compounds represented by the following general formula (A2) or (A3). The ether carboxylate may be used alone or in combination of two or more.

[0025] [Chemical formula] In the general formulas (A2) and (A3), R 8 represents a linear, branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear, branched alkyl or alkenyl group having 5 to 23 carbon atoms. The number of carbon atoms in the R 8 portion is preferably 10 to 14. In the general formula (A2), R 9 may be the same or different and represents an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms. In the general formula (A2), o represents the average number of moles of alkylene oxide added, and the average number of moles of alkylene oxide added is preferably 1 to 5. 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.

[0026] Specific examples of the ether carboxylate represented by the general formula (A2) or (A3) include sodium polyoxyethylene (3) lauryl ether acetate, potassium polyoxyethylene (4) lauryl ether acetate, sodium lauryl glycol acetate, and the like. The numerical value within the parentheses represents the average number of moles (o) of alkylene oxide added.

[0027] As the ether carboxylate, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the ether carboxylate include, for example, under the trade names, Enacol EC-30 (sodium polyoxyethylene (3) lauryl ether acetate) (manufactured by Lion Specialty Chemicals Co., Ltd.), Viewlight LCA-25F (sodium polyoxyethylene (3) lauryl ether acetate), Viewlight LCA-30D (sodium polyoxyethylene (3) lauryl ether acetate), Viewlight LCA-H (polyoxyethylene (4) lauryl ether acetic acid), Viewlight LCA-25NH (laureth-4 carboxylic acid), Viewlight SHAA (sodium lauryl glycol carboxylate), Viewlight LCA (sodium polyoxyethylene (3) lauryl ether acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), Kao Acipo RLM-45NV (sodium polyoxyethylene (4.5) lauryl ether acetate), Kao Acipo RLM-100NV (sodium polyoxyethylene (10) lauryl ether acetate) (all manufactured by Kao Corporation), and the like. The numerical value within the parentheses represents the average number of moles (o) of alkylene oxide added.

[0028] - Amino acid - type surfactant - The amino acid - type surfactant in the component (A) is not particularly limited and can be appropriately selected according to the purpose. Examples include compounds represented by the following general formula (A4). The amino acid - type surfactant may be used alone or in combination of two or more.

[0029] [Chem.] In the general formula (A4), R 10 represents a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms. As for the number of carbon atoms in the R 10 portion, 8 to 18 are preferred. In the general formula (A4), R 11 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. In the general formula (A4), R 12 and R 13 may be the same or different and represent a hydrogen atom or -(CH2) m -COOM 2 . In the general formula (A4), m and n may be the same or different and represent numbers from 0 to 20. In the general formula (A4), M 1 and M 2 may be the same or different and represent a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

[0030] The amino acid structure of the hydrophilic part of the amino acid surfactant is not particularly limited and can be appropriately selected according to the purpose, but glycine, glutamic acid, and methylalanine are preferred.

[0031] Specific examples of the amino acid-based surfactant represented by the general formula (A4) include N-acyl-glycine and its salts such as N-cocoyl-glycine potassium (N-coconut oil fatty acid acyl glycine potassium); N-acyl-N-carboxyethyl-glycine and its salts such as sodium N-myristoyl-N-carboxyethyl-glycine; N-acylglutamic acid and its salts such as sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, potassium N-coconut oil fatty acid acyl-L-glutamate, sodium N-palm fatty acid acyl-L-glutamate, sodium N-stearoyl-L-glutamate; and potassium N-lauroyl-N-methyl-β-alanine.

[0032] As for the amino acid-based surfactant, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available amino acid surfactants include, for example, under the trade names, Amilite (registered trademark) GCK-11 (potassium N-coconut oil fatty acid acyl glycinate), Amilite (registered trademark) GCK-12K (potassium N-coconut oil fatty acid acyl glycinate), Amilite (registered trademark) GCS-12K (sodium N-coconut oil fatty acid acyl glycinate), Amilite (registered trademark) GCS-11 (sodium N-coconut oil fatty acid acyl glycinate), Amisoft (registered trademark) CS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-coconut oil fatty acid acyl-L-glutamate), Amisoft (registered trademark) LS-11 (sodium N-lauroyl-L-glutamate), Amisoft (registered trademark) 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 alaninate) (all manufactured by 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-alaninate) (all manufactured by Nikko Chemicals Co., Ltd.), Alanone ACE (sodium coconut oil fatty acid methylalaninate), Alanone AME (sodium myristoyl methyl-β-alaninate), Alanone ALE (sodium lauroyl methyl-β-alaninate) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Enagicol L-30AN (sodium lauroyl methyl-β-alaninate) (manufactured by Lion Specialty Chemicals Co., Ltd.), Softilt AT-L (sodium lauroyl methyl-β-alaninate) (manufactured by NOF Corporation), and the like.

[0033] The total content of the anionic surfactant as the component (A) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of foam retention and low-temperature stability, it is preferably 10% by mass or more and 25% by mass or less, more preferably 12% by mass or more and 22% by mass or less, based on the total amount of the skin cleansing composition. When the total content of the component (A) is 10% by mass or more based on the total amount of the skin cleansing composition, it is preferable because the foam retention becomes good. When the total content of the component (A) is 25% by mass or less based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability becomes good.

[0034] <(B) Cationic polymer> The cationic polymer (B) is a polymer in which the molar ratio of the structural unit derived from dimethyldiallylammonium chloride is 40% or more, and is contained to improve the moist feeling of the skin after towel drying. The component (B) may be used alone or in combination of two or more.

[0035] Examples of the polymer in which the molar ratio of the structural unit derived from dimethyldiallylammonium chloride is 40% or more include dimethyldiallylammonium chloride-acrylic acid copolymer represented by the following general formula (B1).

[0036]

Chemical formula

[0037] When using a dimethyldiallylammonium chloride-acrylic acid copolymer as the component (B), the molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is 40 mol% or more. Since the molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer being 40 mol% or more results in a good moist feeling of the skin after towel drying, it is preferable. Also, from the viewpoint of improving the moist feeling of the skin after towel drying, the molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is preferably 65 mol% or more, more preferably 95 mol% or more. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more.

[0038] The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) can be determined by measuring under the following measurement conditions by nuclear magnetic resonance (NMR). [Measurement Conditions] Solvent: Heavy water (D2O) Measuring instrument: JNM-LA300 (300 MHz, manufactured by JEOL Ltd.)

[0039] The weight average molecular weight of the cationic polymer (B) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of improving the moist feeling of the skin after towel drying, it is preferably 10,000 to 1,000,000, more preferably 15,000 to 450,000. The weight average molecular weight of the cationic polymer (B) can be measured, for example, by an SEC-MALLS-RI system (measurement conditions: column: TSKgel α series α-M column 30 cm manufactured by Tosoh Corporation, solvent: 0.3 M aqueous sodium nitrate solution).

[0040] The viscosity at 25°C of the 30 to 44 mass% solid content solution of the (B) cationic polymer is preferably 10 mPa·s to 15,000 mPa·s, more preferably 20 mPa·s to 12,000 mPa·s. The viscosity can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0041] As the (B) cationic polymer, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the (B) cationic polymer include Merquat 100, Merquat 106, Merquat 280, and Merquat 295 (all manufactured by Lubrizol). Among these, as the (B) cationic polymer, from the viewpoint of improving foam retention and the smooth feeling of the skin after towel drying, Merquat 100, Merquat 280, and Merquat 295 are preferred. The composition and physical properties of each commercially available product are shown below. - Merquat 100 - · Component name: Dimethyldiallylammonium chloride polymer · Solid content: 39 to 44 mass% · Viscosity at 25°C: 8,000 mPa·s to 12,000 mPa·s · Weight average molecular weight: 150,000 The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C using a spindle No. 3 rotor under the condition of 6 revolutions per minute. - Merquat 106 - · Component name: Dimethyldiallylammonium chloride polymer · Solid content: 30 to 36 mass% · Viscosity at 25°C: 20 mPa·s to 65 mPa·s · Weight average molecular weight: 15,000 Incidentally, the viscosity can be measured at 25°C using a Brookfield viscometer LVF (manufactured by Brookfield Engineering Laboratories, Inc.) with a spindle No. 1 rotor under the condition of 60 revolutions per minute. - Marcote 280- · Component name: Dimethyldiallylammonium chloride - acrylic acid copolymer · Ratio (molar ratio) n:m in the general formula (B1) = 35:65 · Solids content: 39% by mass to 43% by mass · Viscosity at 25°C: 3,000 mPa·s to 6,000 mPa·s · Weight-average molecular weight: 450,000 Incidentally, the viscosity can be measured at 25°C using a Brookfield viscometer LVF (manufactured by Brookfield Engineering Laboratories, Inc.) with a spindle No. 4 rotor under the condition of 60 revolutions per minute. - Marcote 295- · Component name: Dimethyldiallylammonium chloride - acrylic acid copolymer · Ratio (molar ratio) n:m in the general formula (B1) = 5:95 · Solids content: 35% by mass to 40% by mass · Viscosity at 25°C: 3,500 mPa·s to 9,000 mPa·s · Weight-average molecular weight: 190,000 Incidentally, the viscosity can be measured at 25°C using a Brookfield viscometer LVF (manufactured by Brookfield Engineering Laboratories, Inc.) with a spindle No. 4 rotor under the condition of 30 revolutions per minute.

[0042] The content of the (B) cationic polymer is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of improving the moist feeling and non-stickiness of the skin after towel drying, it is preferably 0.1% by mass or more and 1% by mass or less, more preferably 0.2% by mass or more and 0.8% by mass or less, based on the total amount of the skin cleansing composition. When the content of the (B) component is 0.1% by mass or more based on the total amount of the skin cleansing composition, it is suitable because it is excellent in the moist feeling of the skin after towel drying. When the content of the component (B) is 1% by mass or less based on the total amount of the skin cleansing composition, it is suitable because the stickiness on the skin after towel drying is good.

[0043] <(C) (c1) alkylamine oxide, (c2) sorbitan fatty acid ester, and (c3) polyethylene glycol fatty acid ester> The above-mentioned (C) (c1) alkylamine oxide, (c2) sorbitan fatty acid ester, and (c3) polyethylene glycol fatty acid ester are contained to improve the low-temperature stability and maintain the transparency in the appearance of the skin cleansing composition of the present invention. Incidentally, the (c1) alkylamine oxide may be referred to as the "(c1) component", the (c2) sorbitan fatty acid ester may be referred to as the "(c2) component", and the (c3) polyethylene glycol fatty acid ester may be referred to as the "(c3) component".

[0044] -(c1) alkylamine oxide- As the (c1) alkylamine oxide, a compound represented by the following general formula (I) can be used.

[0045]

Chemical formula

[0046] The compound represented by the general formula (I) is not particularly limited and can be appropriately selected according to the purpose. For example, amine oxides such as lauryldimethylamine oxide, myristyldimethylamine oxide, coconut alkyl dimethylamine oxide, lauryl-bis(2-hydroxyethyl)amine oxide, myristyl-bis(2-hydroxyethyl)amine oxide, coconut alkyl-bis(2-hydroxyethyl)amine oxide, dimethyllaurylamine oxide, and dihydroxyethyl lauramine oxide can be mentioned. Among these, from the viewpoint of improving low-temperature stability, dihydroxyethyl lauramine oxide and dimethyllaurylamine oxide are preferable, and dihydroxyethyl lauramine oxide is more preferable. These may be used alone or in combination of two or more.

[0047] As the component (c1), a commercially available product may be used, or a product synthesized as appropriate may be used. Examples of commercially available products of the component (c1) include Unisef A-LE (manufactured by NOF Corporation).

[0048] The content of the component (c1) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of improving low-temperature stability, it is preferably 0.2% by mass or more and 3% by mass or less, more preferably 0.3% by mass or more and 2.5% by mass or less, based on the total amount of the skin cleansing composition. When the content of the component (c1) is 0.2% by mass or more based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved. When the content of the component (c1) is 3% by mass or less based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved.

[0049] -(c2) Sorbitan fatty acid ester - The sorbitan fatty acid ester (c2) is an ester of sorbitan and a fatty acid, and is usually an ester in which 1 to 3 fatty acids are bonded to 1 molecule of sorbitan.

[0050] The component (c2) is not particularly limited and can be appropriately selected according to the purpose. For example, sorbitan laurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan isostearate, sorbitan sesquistearate, sorbitan tristearate, sorbitan monooleate, sorbitan sesquioleate, sorbitan trioleate, sorbitan monoisostearate, sorbitan sesquisoisostearate, sorbitan coconut fatty acid, etc. may be mentioned. Among these, from the viewpoint of improving low-temperature stability, sorbitan isostearate and sorbitan laurate are preferred, and sorbitan isostearate is more preferred. These may be used alone or in combination of two or more.

[0051] As the component (c2), commercially available products may be used, or those synthesized as appropriate may be used. Examples of commercially available products of the component (c2) include EMALEX SPIS-100 (manufactured by Nippon Emulsion Co., Ltd.), NIKKOL SI-10RV (manufactured by Nikko Chemicals Co., Ltd.), SPAN 120 (manufactured by Croda Japan Co., Ltd.), etc.

[0052] The content of the component (c2) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of improving low-temperature stability, it is preferably 0.2% by mass or more and 3% by mass or less, more preferably 0.3% by mass or more and 2.5% by mass or less, based on the total amount of the skin cleansing composition. When the content of the component (c2) is 0.2% by mass or more based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved. When the content of the component (c2) is 3% by mass or less based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved.

[0053] -(c3) Polyethylene glycol fatty acid ester- The polyethylene glycol fatty acid ester (c3) is represented by the following general formula (II). R 5COO(CH2CH2O) n H···(II) In the general formula (II), R 5 represents a linear or branched monovalent hydrocarbon group. The number of carbon atoms in the monovalent hydrocarbon group is preferably 12 to 24, more preferably 12 to 18, and may be saturated or unsaturated. The average number of moles of ethylene oxide (hereinafter sometimes referred to as EO) added to the polyethylene glycol fatty acid ester represented by the general formula (II) is preferably 2 to 150, more preferably 5 to 20, from the viewpoint of low-temperature stability.

[0054] The component (c3) is not particularly limited and can be appropriately selected according to the purpose. For example, polyethylene glycol monostearate, polyethylene glycol monolaurate, polyethylene glycol monoisostearate, polyethylene glycol monooleate, polyethylene glycol-3 isostearate, polyethylene glycol-8 isostearate, etc. can be mentioned. Among these, polyethylene glycol-3 isostearate and polyethylene glycol-8 isostearate are preferred, and polyethylene glycol-3 isostearate is more preferred. These may be used alone or in combination of two or more. Note that the "3" in the polyethylene glycol-3 isostearate represents the average number of moles of ethylene glycol added. Similarly, the "8" in the polyethylene glycol-8 isostearate represents the average number of moles of ethylene glycol added.

[0055] As the component (c3), commercially available products may be used, or those synthesized as appropriate may be used. Examples of commercially available products of the component (c3) include EMALEX PEIS-3, EMALEX PEIS-3EX, EMALEX PEIS-6, EMALEX PEIS-6EX, EMALEX PEIS-6EX, EMALEX PEIS-8, EMALEX PEIS-8EX, EMALEX PEIS-10R, and PEIS-12 (all manufactured by Nippon Emulsion Co., Ltd.), Nonion IS-2, Nonion IS-4, Nonion IS-6 (all manufactured by NOF Corporation), and the like.

[0056] The content of the component (c3) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of improving low-temperature stability, it is preferably 0.2% by mass or more and 3% by mass or less, more preferably 0.3% by mass or more and 2.5% by mass or less, based on the total amount of the skin cleansing composition. When the content of the component (c3) is 0.2% by mass or more based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved. When the content of the component (c3) is 3% by mass or less based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved.

[0057] The total content of the component (C) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of improving low-temperature stability, it is preferably 0.6% by mass or more and 9% by mass or less, more preferably 0.9% by mass or more and 7.5% by mass or less, based on the total amount of the skin cleansing composition. When the total content of the component (C) is 0.6% by mass or more based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved. When the total content of the component (C) is 9% by mass or less based on the total amount of the skin cleansing composition, it is preferable because the low-temperature stability is improved.

[0058] <Mass ratio [(A) / (C)]> The mass ratio [(A) / (C)] of the content of the component (A) to the content of the component (C) in the present invention is preferably 2 or more and 20 or less, more preferably 3.5 or more and 9 or less, from the viewpoint of improving foam retention, low-temperature stability, and the lack of skin itching after towel drying. When the mass ratio is 2 or more, it is preferable because low-temperature stability and foam retention are improved. When the mass ratio is 20 or less, it is preferable because low-temperature stability and the lack of skin itching after towel drying are improved.

[0059] <Other components> In the skin cleansing composition of the present invention, in addition to the component (A), the component (B), and the component (C), other components can be blended as needed within a range that does not impair the effects of the present invention. Examples of the other components include surfactants other than the component (A), water-soluble polymers other than the component (B), oils, silicones, alcohols, lanolin derivatives, protein derivatives, drugs (e.g., vitamins, etc.), moisturizers, bactericides, preservatives, pH adjusters, antioxidants, sequestering agents, ultraviolet absorbers, ultraviolet scattering agents, animal and plant extracts or their derivatives, chelating agents, amino acids, pigments, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer compound powders, and the like. These may be used alone or in combination of two or more. As the other components, those synthesized appropriately may be used, or commercially available products may be used. The content of the other components in the skin cleansing composition is not particularly limited and can be appropriately selected according to the purpose.

[0060] The oil component is not particularly limited and can be appropriately selected according to the purpose. For example, vegetable oils and fats such as castor oil, olive oil, cacao 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, whale wax, lanolin, hydrogenated lanolin, carnauba wax, candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, behenic acid; esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, cholesterol oleate, etc. These may be used alone or in combination of two or more. The content of the oil component is not particularly limited as long as the effects of the present invention are not impaired and can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 3% by mass or less based on the total amount of the skin cleansing composition.

[0061] The alcohols are not particularly limited and can be appropriately selected according to the purpose. For example, natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyl decanol, octyldodecanol, lauryl alcohol, etc. These may be used alone or in combination of two or more. The content of the alcohols is not particularly limited as long as the effects of the present invention are not impaired and can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 3% by mass or less based on the total amount of the skin cleansing composition.

[0062] There are no particular restrictions on the moisturizer, and it can be appropriately selected according to the purpose. For example, isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, polyglycerin, etc. may be mentioned. These may be used alone or in combination of two or more. There are no particular restrictions on the content of the moisturizer as long as the effects of the present invention are not impaired, and it can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 10% by mass or less based on the total amount of the skin cleansing composition.

[0063] There are no particular restrictions on the preservative, and it can be appropriately selected according to the purpose. For example, benzoate, sorbate, dehydroacetate, paraoxybenzoic acid ester, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcin, methylchloroisothiazolinone·methylisothiazolinone solution (trade name: Kathon CG, manufactured by Rohm and Haas Japan), salicylic acid, pentanediol, phenoxyethanol, ethanol, etc. may be mentioned. These may be used alone or in combination of two or more. There are no particular restrictions on the content of the preservative as long as the effects of the present invention are not impaired, and it can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the skin cleansing composition.

[0064] There are no particular restrictions on the antioxidant, and it can be appropriately selected according to the purpose. For example, dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, etc. may be mentioned. These may be used alone or in combination of two or more. There are no particular restrictions on the content of the antioxidant as long as the effects of the present invention are not impaired, and it can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the skin cleansing composition.

[0065] There are no particular limitations on the chelating agent, and it can be appropriately selected according to the purpose. Examples include disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. These may be used alone or in combination of two or more. There are no particular limitations on the content of the chelating agent as long as the effects of the present invention are not impaired, and it can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the skin cleansing agent composition.

[0066] There are no particular limitations on the pH adjuster, and it can be appropriately selected according to the purpose. Examples include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, etc. These may be used alone or in combination of two or more.

[0067] There are no particular limitations on the ultraviolet absorber and the ultraviolet scattering agent, and they can be appropriately selected according to the purpose. Examples include 2-hydroxy-4-methoxybenzophenone, octyldimethyl para-aminobenzoate, ethylhexyl paramethoxysalicylate, titanium oxide, kaolin, talc, etc. These may be used alone or in combination of two or more.

[0068] There are no particular limitations on the vitamins, and they can be appropriately selected according to the purpose. Examples include vitamin A, vitamin B group, 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 its derivatives, etc. These may be used alone or in combination of two or more. There are no particular limitations on the content of the vitamins as long as the effects of the present invention are not impaired, and it can be appropriately selected according to the purpose. However, it is preferably 0.001% by mass or more and 0.5% by mass or less based on the total amount of the skin cleansing agent composition.

[0069] There are no particular restrictions on the amino acids, and they can be appropriately selected according to the purpose. For example, glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and their derivatives can be mentioned. These may be used alone or in combination of two or more. There are no particular restrictions on the content of the amino acids as long as the effects of the present invention are not impaired, and they can be appropriately selected according to the purpose. However, it is preferably 0.001% by mass or more and 0.5% by mass or less based on the total amount of the skin cleansing agent composition.

[0070] There are no particular restrictions on the water-insoluble polymer compound powder, and it can be appropriately selected according to the purpose. For example, nylon, polyethylene, etc. can be mentioned. These may be used alone or in combination of two or more.

[0071] <ph> The pH of the skin cleansing agent composition of the present invention at 25°C is preferably 9.5 or more and 11.0 or less, more preferably 9.8 or more and 10.6 or less. There is no particular limitation on the method for measuring the pH. For example, a method of measuring using a glass electrode color hydrogen ion concentration indicator HM-30R (electrode type GST-5721, manufactured by Toa DKK Corporation) can be mentioned.

[0072] <Viscosity> There is no particular limitation on the viscosity of the skin cleansing agent composition of the present invention at 25°C, and it can be appropriately selected according to the container to be used. However, it is preferably 4 mPa·s or more and 40 mPa·s or less, more preferably 8 mPa·s or more and 30 mPa·s or less. Further, for example, when using a pump foamer container capable of discharging foam by pressing down the nozzle part, with one porous membrane body of 305 mesh and one porous membrane body of 200 mesh attached respectively, under the temperature conditions of use, the viscosity of the skin cleansing agent composition is preferably 30 mPa·s or less, more preferably 25 mPa·s or less. There is no particular limitation on the method for measuring the viscosity. For example, a method of measuring the viscosity after 1 minute at a sample temperature of 25°C, a rotation speed of 60 rpm, and using a No. 1 rotor using a BM type viscometer (manufactured by Tokyo Keiki Co., Ltd.) can be mentioned.

[0073] <Container> The skin cleansing agent composition of the present invention may be of a type filled in a foamer container and discharged in a foamy state.

[0074] - Foamer container - There is no particular limitation on the foamer container, and it can be appropriately selected from known foamer containers. For example, a non-gas type foam discharge container, an aerosol container using a propellant and a pressure-resistant container, etc. can be mentioned. Among these, a non-gas type foam discharge container is preferred. The non-gas type foam discharge container is not particularly limited as long as it can mix the skin cleansing agent composition of the present invention with air and discharge it in a foamed state, and can be appropriately selected according to the purpose. For example, a squeeze former container that can discharge foam by squeezing the bottle body by hand, a pump former container that can discharge foam by pressing down the nozzle part, etc. can be mentioned. As the former container, for example, a former container manufactured by Yamato Can Co., Ltd., a former container manufactured by Yoshino Kogyosho Co., Ltd., etc. can be used. More specifically, as the former container, a former container described in JP-A-7-315463, JP-A-8-230961, JP-A-2005-193972, etc. can be used.

[0075] The non-gas type foam discharge container usually has a porous membrane body (foam forming member) for forming foam, and foam is formed when the skin cleansing agent composition passes through the porous membrane body. The material of the porous membrane body is not particularly limited and can be appropriately selected according to the purpose, but plastic materials such as nylon, polyester, and polyolefin are preferable.

[0076] The mesh of the porous membrane body is not particularly limited and can be appropriately selected according to the purpose. For example, 100 mesh or more is preferable, 100 mesh or more and 400 mesh or less is more preferable, and 200 mesh or more and 305 mesh or less is even more preferable. The number of the porous membrane bodies is not particularly limited and can be appropriately selected according to the purpose, but 2 to 4 sheets are preferable from the viewpoint of improving foam performance (such as foam retention).

[0077] <Manufacturing method> The manufacturing method of the skin cleansing agent composition of the present invention is not particularly limited and can be appropriately selected according to the purpose. The components (A), (B), and (C), and if necessary, the other components and purified water (formulated as the remaining amount so that the whole skin cleansing agent composition becomes 100% by mass) can be mixed to obtain it. Specifically, it can be manufactured as follows. The component (A) is dissolved in purified water heated to 70°C to 80°C, cooled to 40°C or lower, and then the component (B), the component (C), and other components as required are added for manufacturing.

[0078] The skin cleansing composition may be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected according to the purpose. For example, a stirring device equipped with stirring blades having shear force and capable of mixing the whole can be mentioned. The stirring blades are not particularly limited and can be appropriately selected according to the purpose. For example, a propeller, a turbine, a disper, etc. can be mentioned.

[0079] <Use> The use site of the skin cleansing composition is not particularly limited and can be appropriately selected according to the purpose. For example, it can be used on the whole body, face, hands, etc. The use of the skin cleansing composition is not particularly limited and can be appropriately selected according to the purpose. However, while ensuring foaming and the lack of itchiness and moist feeling of the skin after towel drying, it is excellent in low-temperature stability and excellent in maintaining a transparent appearance. Therefore, for example, it can be used for body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, etc. In particular, it can be suitably used for body soaps that are foamed using cleaning tools such as nylon towels and cotton towels.

Examples

[0080] Hereinafter, the present invention will be described more specifically based on examples and comparative examples, but the present invention is not limited to these examples. Also, the content of each component described in the examples and comparative examples is shown in "mass%", and all are values converted to pure components.

[0081] (Examples 1 to 23 and Comparative Examples 1 to 14) The skin cleansing agent compositions having the compositions and contents shown in Tables 1 to 8 below were prepared by the following method. The component (A) was dissolved in purified water heated to 70°C to 80°C, cooled to 40°C or lower, and then the component (B) or the comparative component (B), and the component (C) or the comparative component (C) were added. The purified water was used in an amount such that it would be 95% by mass of the finally obtained skin cleansing agent composition. Thereafter, when the pH was less than the predetermined value, potassium hydroxide, which is another component, was added to adjust the pH to 10.0, and then lauramidopropyl betaine, propylene glycol, and fragrance, which are other components, were added, and purified water was added so that the total amount would be 100% by mass, thereby obtaining the target skin cleansing agent compositions of Examples 1 to 23 and Comparative Examples 1 to 14. Note that stirring was performed using a Three One motor (HEIDON BL1200, manufactured by Shinto Kagaku Co., Ltd.), and a propeller was used as the stirring blade. The pH of the obtained skin cleansing agent compositions of Examples 1 to 23 and Comparative Examples 1 to 14 was measured at 25°C using a pH meter (HM-30R, manufactured by TOA DKK). The obtained skin cleansing agent compositions of Examples 1 to 23 and Comparative Examples 1 to 14 were filled into containers with a pump dispenser (discharge amount 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.).

[0082] Regarding the obtained skin cleansing agent compositions of Examples 1 to 23 and Comparative Examples 1 to 14, "low-temperature stability", "foaming property", "moist feeling of the skin after towel drying", "non-stickiness of the skin after towel drying", and "non-itchiness of the skin after towel drying" were evaluated and judged. The results are shown in Tables 1 to 8 below.

[0083] <Evaluation of Low-Temperature Stability> Approximately 50 g of each skin cleansing agent composition of Examples 1 to 23 and Comparative Examples 1 to 14 was placed in a cylindrical transparent glass bottle (diameter 4 cm, height 7.5 cm) and stored in a constant temperature bath at -5°C for 1 month. A professional panelist visually observed the formation state of precipitates in the skin cleansing agent composition after 1 month of storage and evaluated it based on the following evaluation criteria. - Criteria for Judging "Low-Temperature Stability"- ◎: No crystallization or solid precipitation is observed within 2 weeks 〇: Almost no precipitation of crystals or solids is observed within two weeks (no problem in terms of commercial value). ×: A large amount of crystal or solid precipitation is observed within two weeks.

[0084] <Evaluation of foam retention> Ten professional evaluators took 2 pushes (about 6 g) of each skin cleansing agent composition of Examples 1 to 23 and Comparative Examples 1 to 14 on a nylon towel (Awas Turbo Body Towel, Kikumaru, manufactured by Kikuron Co., Ltd.), washed the whole body, and then observed the "foam retention", and evaluated it based on the following evaluation criteria. The results were obtained by calculating the average score of the 10 professional evaluators and judged based on the following criteria for the average score. - Evaluation criteria for "foam retention"- 4 points: When finishing washing the body, almost all the foam applied to the body at the beginning of washing remains. 3 points: When finishing washing the body, about 80% to 50% of the foam applied to the body at the beginning of washing remains. 2 points: When finishing washing the body, about 40% to 20% of the foam applied to the body at the beginning of washing remains. 1 point: When finishing washing the body, almost no foam applied to the body at the beginning of washing remains. - Judgment criteria for "foam retention"- ◎: The average score is 3.5 or more and 4.0 or less. ○: The average score is 3.0 or more and less than 3.5. △: The average score is 2.0 or more and less than 3.0. ×: The average score is less than 2.0.

[0085] <Evaluation of non-stickiness of the skin after towel drying> Ten professional evaluators took 2 pushes (about 6 g) of each skin cleansing agent composition of Examples 1 to 23 and Comparative Examples 1 to 14 on a nylon towel (Awas Turbo Body Towel, Kikumaru, manufactured by Kikuron Co., Ltd.), washed the whole body, rinsed it off with warm water at 40°C, towel-dried it, and then rested quietly in a constant temperature room at 38°C for 30 minutes, and then evaluated the "non-stickiness of the skin" based on the following evaluation criteria. The results were obtained by calculating the average score of 10 people and judged based on the following criteria for the average score. - Evaluation Criteria for "Absence of Stickiness of Skin after Towel Drying" 4 points: No stickiness is felt at all. 3 points: Little stickiness is felt. 2 points: Stickiness is felt. 1 point: Strong stickiness is felt. - Judgment Criteria for "Absence of Stickiness of Skin after Towel Drying" ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0086] <Evaluation of Moist Feeling of Skin after Towel Drying> Ten professional evaluators each took 2 pushes (about 6 g) of each skin cleansing agent composition of Examples 1 to 23 and Comparative Examples 1 to 14 on a nylon towel (Awas Turbo Body Towel, Kikuron Co., Ltd.), washed the whole body, rinsed it off with warm water at 40°C, towel-dried it, and then rested quietly in a constant temperature room at 25°C for 30 minutes. After that, the "moist feeling of the skin" was evaluated based on the following evaluation criteria. The results were obtained by calculating the average score of the 10 evaluators and judged based on the following judgment criteria for the average score. - Evaluation Criteria for "Moist Feeling of Skin after Towel Drying" 4 points: A strong moist feeling is felt. 3 points: A moist feeling is felt. 2 points: A slightly moist feeling is felt. 1 point: No moist feeling is felt. - Judgment Criteria for "Moist Feeling of Skin after Towel Drying" ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0087] <Evaluation of Itchiness of Skin after Towel Drying> Ten professional evaluators took about 6 g (2 pushes) of each skin cleansing agent composition of Examples 1 to 23 and Comparative Examples 1 to 14 on a nylon towel (such as Awaster Turbo Body Towel, Kikuron Co., Ltd.), washed the whole body, rinsed it off with warm water at 40°C, towel-dried it, and then rested quietly for 30 minutes in a constant temperature room at 25°C. After that, the "absence of skin itching" was evaluated based on the following evaluation criteria. The results were obtained by calculating the average score of the 10 evaluators and judged based on the following criteria for the average score. - Evaluation Criteria for "Absence of Skin Itching after Towel Drying" 4 points: No itching is felt at all. 3 points: Little itching is felt. 2 points: Itching is felt. 1 point: Strong itching is felt. - Judgment Criteria for "Absence of Skin Itching after Towel Drying" ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0088]

Table 1

[0089]

Table 2

[0090]

Table 3

[0091]

Table 4

[0092]

Table 5

[0093]

Table 6

[0094]

Table 7

[0095]

Table 8

[0096] Details of each component used in Examples 1 to 23 and Comparative Examples 1 to 14 are shown in Table 9 below.

[0097]

Table 9

Industrial Applicability

[0098] The skin cleansing agent composition of the present invention is excellent in low-temperature stability and maintaining a transparent appearance while ensuring foamability and the lack of itchiness and moist feeling of the skin after towel drying. Therefore, it can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, etc. In particular, it can be suitably used in body soaps that are foamed and used with cleaning tools such as nylon towels and cotton towels.< / ph>

Claims

1. (A) An anionic surfactant containing laurate, myristate, palmitate, and stearate, and (B) A cationic polymer in which the molar ratio of structural units derived from dimethyldiallylammonium chloride is 40% or more, and (C) (c1) An alkylamine oxide, (c2) A sorbitan fatty acid ester, and (c3) A polyethylene glycol fatty acid ester, and a skin cleansing composition containing the same, The content of the component (A) is 10% by mass or more and 25% by mass or less with respect to the total amount of the skin cleansing composition, The content of the component (B) is 0.1% by mass or more and 1% by mass or less with respect to the total amount of the skin cleansing composition, The content of the component (C) is 0.6% by mass or more and 9% by mass or less with respect to the total amount of the skin cleansing composition, and the skin cleansing composition is characterized by this.

2. The skin cleansing composition according to Claim 1, wherein the mass ratio [(A) / (C)] of the content of the component (A) to the content of the component (C) is 3.5 or more and 9 or less.

3. The content of the component (A) is 12% by mass or more and 22% by mass or less with respect to the total amount of the skin cleansing composition, The content of the component (B) is 0.2% by mass or more and 0.8% by mass or less with respect to the total amount of the skin cleansing composition, The skin cleansing composition according to any one of Claims 1 to 2, wherein the content of the component (C) is 0.9% by mass or more and 7.5% by mass or less with respect to the total amount of the skin cleansing composition.

4. The skin cleansing composition according to any one of Claims 1 to 3, wherein the component (C) is (c1) dihydroxyethyl lauramine oxide, (c2) sorbitan isostearate, and (c3) polyethylene glycol monoisostearate.

5. The skin cleansing composition according to any one of Claims 1 to 4, which is filled in a former container.

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