Liquid skin cleanser composition

Abstract

The present application provides a liquid skin cleanser composition filled in a foaming container, comprising: (A) an anionic surfactant including at least one selected from (a1) palmitate and (a2) stearate, (B) at least one cationic polymer selected from dimethyldiallyl ammonium chloride polymer and dimethyldiallyl ammonium chloride-acrylic acid copolymer, and (C) polyethylene glycol having an average molecular weight of 190 to 630, wherein the mass ratio [(A) / (C)] is 15 to 100.

Description

Technical Field

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

[0002] In the past, people expected liquid skin cleansing compositions such as hand soaps and body soaps to have good foam properties such as long-lasting foam, and good feel during washing, such as giving skin smoothness, giving elasticity to the skin after toweling, and not feeling tight after toweling. However, since most consumers use cleaning tools such as nylon towels or cotton towels for cleaning, when using a spray-foam body soap, which has been in high demand in recent years, with a cleaning tool, there is a problem that it is not possible to simultaneously meet the requirements of foam long-lasting foam and low-temperature stability.

[0003] In order to provide a good feeling during use, a liquid skin cleanser composition containing a fatty acid salt and a cationic polymer having a structural unit derived from dimethyldiallylammonium chloride has been proposed (see, for example, Patent Documents 1 and 2). However, the liquid skin cleanser composition proposed above has problems such as unsatisfactory foam durability when foaming using a cleansing tool such as a nylon towel or a cotton towel, and unsatisfactory elasticity and low-temperature stability of the skin after wiping with a towel.

[0004] In order to improve the foam durability of liquid skin cleanser compositions, liquid skin cleanser compositions containing nonionic surfactants such as polyoxyethylene alkyl ethers and fatty acid monoethanolamides have been proposed (see, for example, Patent Document 3). However, the liquid skin cleanser compositions in the above proposals have problems such as unsatisfactory elasticity and low-temperature stability of the skin after towel drying.

[0005] Generally, it is known that in order to improve the foam durability of a liquid skin cleanser composition, more long-chain fatty acids such as palmitic acid and stearic acid are added. However, when the ratio of long-chain fatty acids in a liquid skin cleanser composition is increased, there are problems such as the precipitation of fatty acids at low temperatures, inability to maintain a transparent appearance, and reduced elasticity of the skin after drying with a towel.

[0006] Therefore, there is a strong demand for providing a liquid skin cleanser composition filled in a foaming container, which has excellent foam durability when foamed using a cleansing tool such as a nylon towel or a cotton towel, does not feel tightness on the skin after towel drying, has smooth skin when rinsed off, has good elasticity on the skin after towel drying, and can prevent the precipitation of fatty acids even under low temperature conditions and maintain a transparent appearance.

[0007] [Prior art literature]

[0008] [Patent Literature]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2004-262838

[0010] [Patent Document 2] Japanese Patent Application Publication No. 2014-208633

[0011] [Patent Document 3] International Patent Publication No. 2019 / 97950 Summary of the invention

[0012] [Problems to be solved by the invention]

[0013] The present invention aims to solve the above-mentioned conventional problems and achieve the following objectives. Specifically, the present invention aims to provide a liquid skin cleanser composition having excellent foam persistence, no feeling of tightness on the skin after towel drying, good smoothness of the skin during rinsing and good elasticity of the skin after towel drying, and excellent low-temperature stability.

[0014]

Methods to solve the problem

[0015] The present inventors have conducted intensive studies and have found that a liquid skin cleanser composition comprises (A) an anionic surfactant including at least one selected from (a1) palmitic acid salt and (a2) stearic acid salt, (B) at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer, and (C) polyethylene glycol having an average molecular weight of 190 to 630, wherein the content of the component (A) is 10% to 25% by mass, the molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) is 40% by mole or more, and the mass ratio of the content of the component (A) to the content of the component (C) [(A) / (C)] is 15 to 100. The composition is filled in a foaming container, has excellent foam durability, does not feel tightness on the skin after towel drying, has good skin smoothness during rinsing and good elasticity on the skin after towel drying, and has excellent low-temperature stability.

[0016] The present invention is based on the above-mentioned knowledge of the present inventors, and the means for solving the above-mentioned problems are as follows. That is,

[0017] <1> A liquid skin cleanser composition, comprising:

[0018] (A) an anionic surfactant comprising at least one selected from (a1) palmitic acid salts and (a2) stearic acid salts,

[0019] (B) at least one cationic polymer selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers, and

[0020] (C) polyethylene glycol having an average molecular weight of 190 to 630,

[0021] The content of the component (A) is 10% to 25% by mass, the molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) is 40% by mole or more, and the mass ratio of the content of the component (A) to the content of the component (C) [(A) / (C)] is 15 to 100,

[0022] The above composition is filled in a foaming container.

[0023] <2> According to the above <1> The liquid skin cleanser composition further contains (D) a copolymer represented by the following general formula (1).

[0024]

Chemistry 1

[0025]

[0026] In the above general formula (1), n, m and z represent the molar ratio (mol %) of each structural unit, n+m+z=100, the above n is 0-34, the above m is 24-31, and the above z is 35-76.

[0027] <3> According to the above <1> ~ <2> In any one of the liquid skin cleansing compositions, a mass ratio of the total content of the palmitic acid salt (a1) and the stearic acid salt (a2) to the content of the component (A) [((a1)+(a2)) / (A)] is 0.1 to 0.5.

[0028] <4> According to the above <1> ~ <3> In any one of the liquid skin cleansing compositions, the content of the component (B) is 0.2 to 0.8% by mass, the content of the component (C) is 0.2 to 0.8% by mass, and the content of the component (D) is 0.05 to 0.3% by mass.

[0029] [Effects of the invention]

[0030] According to the present invention, the above-mentioned problems in the past can be solved and the above-mentioned objects can be achieved. A liquid skin cleanser composition can be provided, which has excellent foam persistence, does not feel tightness on the skin after towel drying, has good smoothness when rinsing and elasticity of the skin after towel drying, and has excellent low-temperature stability. DETAILED DESCRIPTION

[0031] (Liquid skin cleanser composition)

[0032] The liquid skin cleanser composition of the present invention contains (A) anionic surfactant, (B) cationic polymer, (C) polyethylene glycol, and preferably (D) a copolymer, and further contains other components as necessary.

[0033] <(A) Anionic surfactant>

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

[0035] In addition, "foam persistence" in this specification means that the foam is maintained and does not disappear when the cleansing tool is used. The above-mentioned cleansing tool is not particularly limited as long as it is a tool for skin cleansing, and can be appropriately selected according to the purpose, for example, nylon towels, cotton towels, etc. can be mentioned.

[0036] The anionic surfactant of the component (A) contains at least one selected from the group consisting of (a1) palmitic acid salt (hereinafter sometimes referred to as "component (a1)") and (a2) stearic acid salt (hereinafter sometimes referred to as "component (a2)").

[0037] The anionic surfactant of the component (A) is not particularly limited as long as it contains at least one selected from the palmitic acid salt (a1) and the stearic acid salt (a2), and can be appropriately selected according to the purpose. For example, higher fatty acid salts other than the components (a1) and (a2), polyoxyethylene (POE) alkyl ether sulfates, ether carboxylates, amino acid surfactants, etc. can be cited. These can be used alone or in combination of two or more. Among these, higher fatty acid salts and POE alkyl ether sulfates are preferred, and higher fatty acid salts are more preferred.

[0038] -Higher fatty acid salts-

[0039] As the above-mentioned higher fatty acid salt in the above-mentioned (A) component, there is no particular limitation as long as it contains at least one selected from the above-mentioned (a1) palmitate and the above-mentioned (a2) stearate, and it can be appropriately selected according to the purpose. For example, laurate, myristic acid salt, etc. can be listed. These can be used alone or in combination of two or more. From the perspective of foam durability and the elasticity of the skin after towel drying, it is preferred that the higher fatty acid salt contains palmitate, stearate, laurate and myristic acid salt.

[0040] The counter ion of the higher fatty acid salt is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include alkali metal salts, amine salts, and amino acid salts.

[0041] The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose. For example, a sodium salt, a potassium salt, etc. are mentioned.

[0042] The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include ammonium salts, monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkylolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol.

[0043] The amino acid salt is not particularly limited and can be appropriately selected depending on the intended purpose. Examples of the amino acid salt include lysine salts and arginine salts.

[0044] Among them, alkali metal salts are preferred, and potassium salts are particularly preferred.

[0045] The higher fatty acid salts may be appropriately synthesized or commercially available.

[0046] Examples of commercially available products of the higher fatty acid salts include NONSOUL PK-1 (potassium palmitate, manufactured by NOF Corporation), NONSOUL SK-1 (potassium stearate, manufactured by NOF Corporation), NIKKOL potassium laurate LK-120 (potassium laurate, manufactured by Nikko Chemical Co., Ltd.), NIKKOL potassium myristate MK-140 (potassium myristate, manufactured by Nikko Chemical Co., Ltd.), and TYSOUP MNK-40 (coconut oil fatty acid potassium-potassium myristate mixed liquid, manufactured by Nikko Chemical Co., Ltd.).

[0047] The higher fatty acid salts may be mixed as the higher fatty acid salts, or higher fatty acids and salts such as potassium hydroxide that serve as the above counter ions may be added separately to a mixing tank and allowed to undergo a neutralization reaction to generate the higher fatty acid salts.

[0048] The higher fatty acid used for preparing the higher fatty acid salt may be a suitably synthesized one or a commercially available one.

[0049] Commercially available products of the above-mentioned higher fatty acids include, for example, NAA (registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), NAA (registered trademark)-180 (stearic acid, manufactured by NOF Corporation), NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), and NAA (registered trademark)-142 (myristic acid, manufactured by NOF Corporation).

[0050] The content of the palmitic acid salt (a1) is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 to 10% by mass, more preferably 3 to 9% by mass, based on the total amount of the liquid skin cleanser composition.

[0051] The content of the stearate (a2) is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.1 to 3% by mass, more preferably 0.2 to 1% by mass, based on the total amount of the liquid skin cleanser composition.

[0052] The content of the lauric acid salt is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 3 to 12% by mass, more preferably 7 to 10% by mass, based on the total amount of the liquid skin cleanser composition.

[0053] The content of the stearate is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 3 to 14% by mass, more preferably 8 to 14% by mass, based on the total amount of the liquid skin cleanser composition.

[0054] -Polyoxyethylene alkyl ether sulfate-

[0055] The polyoxyethylene alkyl ether sulfate in the component (A) is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include compounds represented by the following general formula (A1). The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more.

[0056]

Chemistry 2

[0057] R 1 -O(CH2-CH2O) n -SO3X General formula (A1)

[0058] In the above general formula (A1), R 1 The alkyl group preferably has 10 to 14 carbon atoms.

[0059] 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.

[0060] In the above general formula (A1), X represents an alkali metal or ammonium.

[0061] The alkali metal is not particularly limited and can be appropriately selected depending on the purpose. Examples of the alkali metal include sodium and potassium.

[0062] Specific examples of the above-mentioned polyoxyethylene alkyl ether sulfates 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, C13) ether sodium sulfate, polyoxyethylene (2) lauryl ether ammonium sulfate, polyoxyethylene (3) lauryl ether ammonium sulfate, and the like.

[0063] The numerical value in parentheses indicates the average number of added moles (n) of ethylene oxide (EO).

[0064] The polyoxyethylene alkyl ether sulfate may be a suitably synthesized product or a commercially available product.

[0065] Examples of commercially available products of the polyoxyethylene alkyl ether sulfate include Texapon (registered trademark) N70 (manufactured by BASF, sodium polyoxyethylene (2) lauryl ether sulfate) and Sinolin SPE-1250 (manufactured by Shin Nippon Rika Co., Ltd., sodium polyoxyethylene (2) lauryl ether sulfate).

[0066] -Ether carboxylates-

[0067] The ether carboxylate in the component (A) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A2) or (A3). The ether carboxylates may be used alone or in combination of two or more.

[0068]

Chemistry 3

[0069] R 2 -O-(R 3 O) o -CH2COOM 1 General formula (A2)

[0070]

[0071] 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, wherein R 2 The moiety preferably has 10 to 14 carbon atoms.

[0072] In the above general formula (A2), R 3 The alkylene groups may be the same or different and represent an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms.

[0073] In the general formula (A2), o represents an average number of moles of alkylene oxide added of 1 to 20, and the average number of moles of alkylene oxide added is preferably 1 to 5.

[0074] In the above general formulas (A2) and (A3), M 1 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or a basic amino acid.

[0075] 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.

[0076] The numerical value in () above represents the average number of added moles of alkylene oxide (o).

[0077] The ether carboxylates may be appropriately synthesized or commercially available products.

[0078] Examples of commercially available products of the ether carboxylates include Enagicol EC-30 (manufactured by Lion Chemical Co., Ltd., polyoxyethylene (3) lauryl ether sodium acetate), BEAULIGHT LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), BEAULIGHT LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), BEAULIGHT LCA-H (polyoxyethylene (4) lauryl ether acetate), BEAULIGHT LCA-25NH (laureth-4 carboxylic acid), BEAULIGHT SHAA (sodium lauryl glycol carboxylate), BEAULIGHT LCA (polyoxyethylene (3) lauryl ether sodium acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), KAO AKYPO RLM-45NV (polyoxyethylene (4.5) lauryl ether sodium acetate), KAO AKYPO RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (produced by Kao Corporation) and the like.

[0079] The numerical value in () above represents the average number of added moles of alkylene oxide (o).

[0080] -Amino Acid Surfactant-

[0081] The amino acid surfactant in the component (A) is not particularly limited and can be appropriately selected according to the purpose, and examples thereof include compounds represented by the following general formula (A4). The amino acid surfactant may be used alone or in combination of two or more.

[0082]

Chemistry 4

[0083]

[0084] 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, as the above R 4 The number of carbon atoms in the moiety is preferably 8-18.

[0085] In the above general formula (A4), R 5 It represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

[0086] In the above general formula (A4), R 6 and R 7 Can be the same or different, representing a hydrogen atom or -(CH2) m -COOM 2 .

[0087] In the above general formula (A4), m and n may be the same as or different from each other, and represent a number of 0 to 20.

[0088] In the above general formula (A4), M 1 and M 2 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.

[0089] The amino acid structure of the hydrophilic part of the amino acid-based surfactant is not particularly limited and can be appropriately selected depending on the intended purpose, but glycine, glutamic acid, and methylalanine are preferred.

[0090] 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 oil 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 oil 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.

[0091] The amino acid-based surfactant may be a suitably synthesized one or a commercially available one.

[0092] Examples of commercially available amino acid surfactants include those sold under the trade names AMILITE (registered trademark) GCK-11 (N-coconut oil fatty acid acyl glycinate potassium), AMILITE (registered trademark) GCK-12K (N-coconut oil fatty acid acyl glycinate potassium), AMILITE (registered trademark) GCS-12K (N-coconut oil fatty acid acyl glycinate sodium), AMILITE (registered trademark) GCS-11 (N-coconut oil fatty acid acyl glycinate sodium), AMISOFT (registered trademark) CS-11 (N-myristoyl-L-glutamate sodium), AMISOFT (registered trademark) CS-22 (N-coconut oil fatty acid acyl glycinate sodium), AMISOFT (registered trademark) CS-23 (N-coconut oil fatty acid acyl glycinate sodium), AMISOFT (registered trademark) CS-24 (N-coconut oil fatty acid acyl glycinate sodium). Oil fatty acid acyl-L-glutamate sodium), AMISOFT (registered trademark) LS-11 (N-lauroyl-L-glutamate sodium), AMISOFT (registered trademark) MS-11 (N-myristoyl-L-glutamate sodium), AMISOFT (registered trademark) HS-11P (N-stearoyl-L-glutamate sodium), AMISOFT (registered trademark) HS-11P (F) (N-stearoyl-L-glutamate sodium), AMISOFT (registered trademark) HS21 (N-stearoyl-L-glutamate sodium), AMILITE (registered trademark) ACS-12 (cocoyl alanine sodium) (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 oil 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.), SOFTILT AT-L (sodium lauroyl methyl-β-alanine) (manufactured by NOF Corporation), etc.

[0093] From the viewpoint of foam persistence, elasticity of the skin after towel drying, and low temperature stability, the content of the anionic surfactant of the component (A) is 10% to 25% by mass, preferably 12% to 20% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the component (A) is less than 10% by mass, the foam persistence becomes insufficient, and when it is more than 25% by mass, the elasticity of the skin after towel drying and low temperature stability become insufficient.

[0094] The mass ratio of the total content of the palmitic acid salt (a1) and the stearic acid salt (a2) to the content of the component (A) [((a1) + (a2)) / (A)] is not particularly limited and can be appropriately selected according to the purpose, but is preferably 0.1 to 0.5, more preferably 0.15 to 0.3, from the viewpoint of foam durability, elasticity of the skin after toweling, and low-temperature stability. When the [((a1) + (a2)) / (A)] is 0.1 or more, foam durability is good, and when it is 0.5 or less, elasticity of the skin after toweling and low-temperature stability are good.

[0095] <(B) Cationic polymer>

[0096] The cationic polymer as the component (B) is at least one selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers, and is contained mainly to improve the elasticity of the skin after towel drying and the smoothness of the skin during rinsing.

[0097] The dimethyldiallylammonium chloride-acrylic acid copolymer in the above-mentioned component (B) is represented by the following general formula (B1).

[0098]

Chemistry 5

[0099]

[0100] In the above general formula (B1), n ​​and m represent the molar ratio (mol %) of each structural unit, n+m=100, and the above m is 40 mol % or more.

[0101] From the viewpoint of elasticity of the skin after towel drying, the molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) is preferably 65 mol % or more, more preferably 96 mol % or more.

[0102] The above-mentioned dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more.

[0103] The molar ratio of the structural units in the dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) can be determined by nuclear magnetic resonance (NMR) under the following measurement conditions.

[0104]

Measurement conditions

[0105] Solvent: Heavy water (D2O)

[0106] Measuring instrument: JNM-LA300 (300 MHz, manufactured by JEOL Ltd.)

[0107] The weight average molecular weight of the cationic polymer as the component (B) is not particularly limited and can be appropriately selected depending on the intended purpose, but is preferably 10,000 to 1,000,000, more preferably 15,000 to 450,000.

[0108] The weight average molecular weight of the cationic polymer of component (B) can be measured, for example, using a SEC-MALLS-RI system (measurement conditions: column: TSK gel α series manufactured by Tosoh Corporation, α-M column 30 cm, solvent: 0.3 M sodium nitrate aqueous solution).

[0109] The viscosity of a solution of the component (B) cationic polymer having a solid content of 30 to 44% by mass at 25° C. is preferably 10 to 15,000 mPa·s, more preferably 20 to 12,000 mPa·s.

[0110] The viscosity can be measured using, for example, a Brookfield viscometer LVF (manufactured by Brookfield).

[0111] The cationic polymer of the component (B) may be a suitably synthesized product or a commercially available product. Examples of commercially available cationic polymers of the component (B) include the following products by trade name.

[0112] Merquat 100 (ingredient name: dimethyldiallylammonium chloride polymer, manufactured by The Lubrizol Corporation, solid content 39% to 44% by mass, viscosity at 25°C: 8,000 to 12,000 mPa·s, weight average molecular weight: 150,000).

[0113] The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Co., Ltd.) at 25° C. using a No. 3 spindle rotor at 6 rpm.

[0114] Merquat 106 (ingredient name: dimethyldiallylammonium chloride polymer, manufactured by The Lubrizol Corporation, Japan, solid content 30% to 36% by mass, viscosity at 25° C.: 20 to 65 mPa·s, weight average molecular weight: 15,000).

[0115] The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Co., Ltd.) at 25° C. with a No. 1 spindle rotor at 60 rpm.

[0116] Merquat 280 (ingredient name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by The Lubrizol Corporation, solid content 39% to 43% by mass, viscosity at 25°C 3,000 to 6,000 mPa·s, weight average molecular weight: 450,000, n:m in the above general formula (1) = 35:65 (molar ratio), the molar ratio of the structural unit derived from dimethyldiallylammonium chloride is 65 mol%).

[0117] The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a No. 4 spindle rotor at 60 rpm.

[0118] Merquat 295 (ingredient name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by The Lubrizol Corporation, solid content 35% to 40% by mass, viscosity at 25°C of 3,500 to 9,000 mPa·s, weight average molecular weight: 190,000, n:m in the above general formula (1) = 5:95 (molar ratio), the molar ratio of the structural unit derived from dimethyldiallylammonium chloride is 95 molar %).

[0119] The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a No. 4 spindle rotor at 30 rpm.

[0120] Among these, Merquat 100, Merquat 280, and Merquat 295 are preferred as the cationic polymer of the component (B) from the viewpoint of the elasticity of the skin after towel drying.

[0121] The content of the cationic polymer as the component (B) is not particularly limited and can be appropriately selected according to the purpose, but from the perspective of foam persistence, elasticity of the skin after towel drying, and skin smoothness during rinsing, it is preferably 0.1% by mass to 1% by mass, and more preferably 0.2% by mass to 0.8% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the component (B) is 0.1% by mass or more, the elasticity of the skin after towel drying is good, and when it is 1% by mass or less, the skin does not feel tight after towel drying, which is good.

[0122] <(C) Polyethylene glycol>

[0123] The polyethylene glycol as the component (C) has an average molecular weight of 190 to 630 and is contained mainly to improve the elasticity and low-temperature stability of the skin after towel drying.

[0124] If the average molecular weight of the component (C) is greater than 630, the elasticity of the skin after towel drying may be reduced. In addition, there is no commercially available polyethylene glycol having an average molecular weight of less than 190.

[0125] The average molecular weight can be measured by the average molecular weight test described in the Standards for Quasi-drug Ingredients 2006.

[0126] Examples of the polyethylene glycol as the component (C) include polyethylene glycol 200 (average molecular weight 190 to 210), polyethylene glycol 300 (average molecular weight 280 to 320), polyethylene glycol 400 (average molecular weight 380 to 420), and polyethylene glycol 600 (average molecular weight 570 to 630). These may be used alone or in combination of two or more. Among these, polyethylene glycol 400 (average molecular weight 380 to 420) is preferred as the component (C) from the viewpoint of elasticity and low-temperature stability of the skin after towel drying.

[0127] In addition, depending on the product, for example, polyethylene glycol 200 may have # added between polyethylene glycol and the numerical value, such as polyethylene glycol #200.

[0128] The content of the polyethylene glycol as the component (C) is not particularly limited and can be appropriately selected according to the purpose, but from the perspective of the elasticity of the skin after toweling, it is preferably 0.1% by mass to 1.0% by mass, and more preferably 0.2% by mass to 0.8% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the component (C) is 0.1% by mass or more, the elasticity of the skin after toweling and the low temperature stability are good, and when it is 1.0% by mass or less, the low temperature stability is good.

[0129] <Mass ratio [(A) / (C)]>

[0130] From the viewpoint of foam durability, elasticity of the skin after towel drying, and low temperature stability, the mass ratio of the content of the component (A) to the content of the component (C) [(A) / (C)] is 15 to 100, preferably 20 to 40. When the mass ratio [(A) / (C)] is less than 15, the foam durability becomes insufficient, and when it exceeds 100, the elasticity of the skin after towel drying and low temperature stability become insufficient.

[0131] <(D) A copolymer represented by the following general formula (1)>

[0132] The component (D) copolymer is preferably contained in order to improve the smoothness of the skin during rinsing.

[0133] The component (D) copolymer is a copolymer represented by the following general formula (1).

[0134]

Chemistry 6

[0135]

[0136] In the above general formula (1), n, m and z represent the molar ratio (mol %) of each structural unit, and n+m+z=100.

[0137] The above n is preferably 0-34, the above m is preferably 34-31, and the above z is preferably 35-76.

[0138] Among these, from the viewpoint of the smoothness of the skin during rinsing, n:m:z=0:24:76 in the above general formula (1) is preferred.

[0139] The molar ratio of each structural unit in the copolymer of the component (D) can be determined by measuring with nuclear magnetic resonance (NMR) under the following measurement conditions.

[0140]

Measurement conditions

[0141] Solvent: Heavy water (D2O)

[0142] Measuring instrument: JNM-LA300 (300 MHz, manufactured by JEOL Ltd.)

[0143] The weight average molecular weight of the copolymer of component (D) is not particularly limited and can be appropriately selected according to the purpose, but is preferably 100,000 to 3,000,000, and more preferably 100,000 to 1,600,000. The weight average molecular weight of the copolymer of component (D) can be measured, for example, using a SEC-MALLS-RI system (measurement conditions: column: TSKgelα series manufactured by Tosoh Corporation, α-M column 30 cm, solvent: 0.3 M sodium nitrate aqueous solution).

[0144] The viscosity of the copolymer solution having a solid content of 8 to 45% by mass in the copolymer (D) component at 25° C. is not particularly limited and can be appropriately selected depending on the intended purpose, but is preferably 1,500 to 16,000 mPa·s.

[0145] The viscosity can be measured using, for example, a Brookfield viscometer LVF (manufactured by Brookfield).

[0146] As the copolymer of the component (D), a suitably synthesized one may be used, or a commercially available one may be used. Examples of the commercially available one include the following.

[0147] Merquat 550PR (ingredient name: dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol Corporation, solid content 8.8% to 9.8% by mass, viscosity at 25°C: 7,500 mPa·s to 15,000 mPa·s, weight average molecular weight: 1,600,000, n:m:z in the above general formula (1) = 0:30:70). The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with a No. 4 spindle rotor at 10 rpm.

[0148] Merquat 740 (ingredient name: dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol Corporation, solid content 41% to 45% by mass, viscosity at 25°C: 2,000 mPa·s to 12,000 mPa·s, weight average molecular weight: 120,000, n:m:z in the above general formula (1) = 0:24:76). The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with a No. 4 spindle rotor at 10 rpm.

[0149] Merquat 3330PR (ingredient name: acrylic acid-dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol Corporation, solid content 10.2% to 11.5% by mass, viscosity at 25°C: 1,000 mPa·s to 6,000 mPa·s, weight average molecular weight: 1,500,000, n:m:z in the above general formula (1) = 34:31:35). The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with a No. 4 spindle rotor at 30 rpm.

[0150] Merquat 3331PR (ingredient name: acrylic acid-dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol Corporation, solid content 9.7% to 10.7% by mass, viscosity at 25°C: 2,000 mPa·s to 12,000 mPa·s, weight average molecular weight: 1,600,000, n:m:z in the above general formula (1) = 22.5:26.5:51). The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with a No. 5 spindle rotor at 30 rpm.

[0151] Merquat 3940 (ingredient name: acrylic acid-dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol Corporation, solid content 41% to 45% by mass, viscosity at 25°C: 1,500 mPa·s to 4,500 mPa·s, weight average molecular weight: 150,000, n:m:z in the above general formula (1) = 31:29:40). The above viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with a No. 3 spindle rotor at 10 rpm.

[0152] Among these, Merquat 740 is preferred as the copolymer of the component (D) from the viewpoint of smoothness of the skin during rinsing.

[0153] From the perspective of smoothness of the skin during rinsing and the feeling of firmness of the skin after toweling, the content of the copolymer of the component (D) is preferably 0.01% to 0.5% by mass, more preferably 0.05% to 0.3% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the component (D) is 0.01% by mass or more, the smoothness of the skin during rinsing is good, and when it is 0.5% by mass or less, the feeling of firmness of the skin after toweling is good.

[0154] <Other ingredients>

[0155] The liquid skin cleanser composition may contain other components, in addition to the component (A), the component (B), the component (C) and the component (D), as necessary, within a range not impairing the effects of the present invention.

[0156] Examples of the other components include surfactants other than the component (A), water-soluble polymers other than the component (B) and the component (D), oils, silicones, alcohols, lanolin derivatives, protein derivatives, drugs (e.g., vitamins, etc.), moisturizers, bactericides, preservatives, pH adjusters, antioxidants, chelating agents, ultraviolet light absorbing and scattering agents, plant and animal extracts or derivatives thereof, chelating agents, ultraviolet light absorbing and scattering agents, amino acids, coloring agents, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer powders, etc. These may be used alone or in combination of two or more.

[0157] As the above-mentioned oil component, for example, castor oil, olive oil, cocoa butter, hardened palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grape seed oil, avocado oil and other plant oils and their ester compounds; mink oil, egg yolk oil and other animal oils; beeswax, spermaceti, lanolin, hydrogenated lanolin, carnauba wax, candelilla wax and other waxes; liquid paraffin, squalane, microcrystalline paraffin, ozokerite, paraffin, vaseline and other hydrocarbons; oleic acid, isostearic acid, behenic acid and other natural and synthetic fatty acids; tri (2-ethylhexanoic acid) glyceryl, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, myristic acid octyl dodecyl ester, oleic acid octyl dodecyl ester, cholesterol oleate and other esters, etc. These can be used alone or in combination of two or more.

[0158] The content of the oil component is not particularly limited unless the effects of the present invention are impaired, and can be appropriately selected depending on the intended purpose, but is preferably 0.1% by mass to 3% by mass based on the total amount of the liquid skin cleanser composition.

[0159] As the alcohols, for example, lower alcohols or higher alcohols can be cited, and specific examples thereof include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol, etc. These can be used alone or in combination of two or more.

[0160] The content of the alcohol is not particularly limited unless the effects of the present invention are impaired, and may be appropriately selected depending on the intended purpose, but is preferably 0.1% by mass to 3% by mass based on the total amount of the liquid skin cleanser composition.

[0161] Examples of the moisturizer include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, polypropylene glycol, hardened castor oil (30 EO), diglycerol, triglycerol, polyglycerol, etc. These may be used alone or in combination of two or more.

[0162] The content of the alcohol is not particularly limited unless the effects of the present invention are impaired, and may be appropriately selected depending on the intended purpose, but is preferably 0.1% by mass to 10% by mass based on the total amount of the liquid skin cleanser composition.

[0163] Examples of the preservative include benzoates, sorbates, dehydroacetates, parabens, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-triclocarban, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone / methylisothiazolinone liquid (trade name: Kathon CG, manufactured by ROHM AND HAAS JAPAN), salicylic acid, pentylene glycol, phenoxyethanol, ethanol, etc. These may be used alone or in combination of two or more.

[0164] The content of the preservative is not particularly limited unless the effects of the present invention are impaired, and may be appropriately selected depending on the intended purpose, but is preferably 0.1% by mass to 1% by mass based on the total amount of the liquid skin cleanser composition.

[0165] Examples of the antioxidant include butylated hydroxytoluene, butylated hydroxyanisole, ascorbic acid, etc. These may be used alone or in combination of two or more.

[0166] The content of the antioxidant is not particularly limited unless the effects of the present invention are impaired, and may be appropriately selected depending on the intended purpose, but is preferably 0.1% by mass to 1% by mass based on the total amount of the liquid skin cleanser composition.

[0167] Examples of the chelating agent include EDTA-2Na, ethylenediaminetetraacetate, sodium hexametaphosphate, gluconic acid, etc. These may be used alone or in combination of two or more.

[0168] The content of the anti-chelating agent is not particularly limited unless the effects of the present invention are impaired, and may be appropriately selected depending on the intended purpose, but is preferably 0.1 to 1% by mass based on the total amount of the liquid skin cleanser composition.

[0169] Examples of the pH adjuster include sodium hydroxide, potassium hydroxide, citric acid, hydrochloric acid, succinic acid, triethanolamine, ammonia water, triisopropanolamine, phosphoric acid, glycolic acid, etc. These may be used alone or in combination of two or more.

[0170] Examples of the ultraviolet absorbing and scattering agent include 2-hydroxy-4-methoxybenzophenone, dimethyloctyl p-aminobenzoate, ethylhexyl p-methoxycinnamate, titanium oxide, kaolin, talc, etc. These may be used alone or in combination of two or more.

[0171] Examples of the vitamins 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 derivatives thereof, etc. These may be used alone or in combination of two or more.

[0172] The content of the vitamins is not particularly limited unless the effects of the present invention are impaired, and may be appropriately selected depending on the intended purpose, but is preferably 0.001% by mass to 0.5% by mass based on the total amount of the liquid skin cleanser composition.

[0173] As the amino acids, for example, glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine and derivatives thereof can be mentioned, and these can be used alone or in combination of two or more.

[0174] The content of the amino acids is not particularly limited unless the effects of the present invention are impaired, and can be appropriately selected depending on the intended purpose, but is preferably 0.001% by mass to 0.5% by mass based on the total amount of the liquid skin cleanser composition.

[0175] Examples of the water-insoluble polymer compound include nylon and polyethylene, etc. These may be used alone or in combination of two or more.

[0176] -pH-

[0177] The pH of the liquid skin cleanser composition at 25° C. is not particularly limited and can be appropriately selected depending on the intended purpose, but is preferably 9.5 to 11.0, more preferably 9.8 to 10.6.

[0178] The pH can be measured, for example, using a glass electrode type hydrogen ion concentration indicator HM-30R (manufactured by DKK Toa Co., Ltd., electrode model GST-5721).

[0179] -Viscosity-

[0180] The viscosity of the liquid skin cleanser composition at 25° C. is not particularly limited and can be appropriately selected depending on the container used, but is preferably 4 to 40 mPa·s, more preferably 8 to 30 mPa·s.

[0181] For example, when a foaming container capable of discharging foam by pressing a nozzle and a porous membrane of 305 mesh and 200 mesh are used, the viscosity of the liquid skin cleanser composition is preferably 30 mPa·s or less, more preferably 25 mPa·s or less, under the temperature conditions of use.

[0182] 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.

[0183] -container-

[0184] The liquid skin cleanser composition is of a type that is filled in a foaming container and discharged in the form of foam.

[0185] 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 these, non-gas foam discharge containers are preferred.

[0186] As the above-mentioned non-gas type foam discharge container, as long as the above-mentioned liquid skin cleanser composition can be mixed with air and discharged in a foamed state, there is no particular limitation, and it can be appropriately selected according to the purpose, for example, an extrusion foaming container that can discharge foam by pressing the bottle body with hand, a pump foaming container that can discharge foam by pressing the nozzle portion, etc. can be listed. Such a foaming container can use containers manufactured by Yamato Can Co., Ltd., Yoshino Industry Co., Ltd., etc. More specifically, as a foaming container, a foaming container recorded in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, Japanese Patent Publication No. 2005-193972, etc. can be used.

[0187] 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 foam is formed by passing the liquid skin cleanser composition through the porous membrane.

[0188] The mesh size of the porous membrane is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 100 mesh or more, more preferably 100 mesh to 400 mesh, and further preferably 200 mesh to 305 mesh.

[0189] The number of the porous membranes is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 2 to 4 in view of improving foaming performance.

[0190] -Manufacturing method-

[0191] 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 liquid skin cleanser composition can be obtained by mixing the component (A), the component (B) and the component (C), and, if necessary, the component (D), the other components and purified water (the remainder being mixed so that the entire liquid skin cleanser composition becomes 100% by mass).

[0192] Specifically, the above-mentioned (A) component can be dissolved in purified water heated to 70°C to 80°C, cooled to 40°C or lower, and then added with the above-mentioned (B) component, the above-mentioned (C) component, and, if necessary, the above-mentioned (D) component and the above-mentioned other components.

[0193] 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. Examples thereof include a stirring apparatus equipped with a stirring blade that has a shearing force and can mix the entire composition.

[0194] The stirring blade is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include a propeller, a turbine, and a disperser.

[0195] -use-

[0196] The application site of the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the intended purpose. For example, the liquid skin cleanser composition can be applied to the whole body, face, hands, and the like.

[0197] The use of the liquid skin cleanser composition is not particularly limited and can be appropriately selected according to the purpose. Since the liquid skin cleanser composition has excellent foam persistence, the skin does not feel tight after being dried with a towel, the skin is smooth during rinsing and the skin is elastic after being dried with a towel, and it has excellent low-temperature stability, it can be used, for example, in bath shampoo, bath soap, facial cleanser, hand soap, foam hand soap, cleansing foam, makeup remover, etc., and is particularly suitable for bath soap used with a nylon towel or cotton towel to foam.

[0198] [Example]

[0199] The present invention will be further described below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples at all.

[0200] The content of each component described in the examples and comparative examples is expressed as "mass %", with the total amount being 100 mass %, and is the value after purity conversion. In addition, the mass ratio of the content (mass %) of component (A) to the content (mass %) of component (C) [(A) / (C)] is rounded off to the first decimal place after the second decimal place. The mass ratio of the total content (mass %) of component (a1) (potassium palmitate) and component (a2) (potassium stearate) to the content of component (A) [((a1)+(a2) / (A))] is rounded off to the second decimal place after the third decimal place after the second ...

[0201] (Examples 1 to 11, 19 to 32 and Comparative Examples 1 to 10)

[0202] According to the compositions and contents shown in Tables 1 to 5 below, liquid skin cleanser compositions were prepared according to the following method.

[0203] Purified water was heated to 70°C to 80°C to dissolve the anionic surfactant (A) component, and after cooling to 40°C, the cationic polymer (B) component or the comparative component cationized cellulose of (B) component and the polyethylene glycol (C) component or the comparative component of (C) component were added. The purified water was used in an amount that was 95% by mass of the liquid skin cleanser composition finally obtained. Then, when the prescribed pH (pH 10.0) was not satisfied, potassium hydroxide was added as a common component, and after adjusting the prescribed pH to 10.0, lauric acid amide propyl betaine, propylene glycol and fragrance as common components were added, and purified water was added to make the total amount 100% by mass to obtain the liquid skin cleanser compositions of Examples 1 to 11, 19 to 32 and Comparative Examples 1 to 10.

[0204] When preparing each of the above liquid skin cleanser compositions, a propeller-type stirring blade was used for stirring using a three-one motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.) The pH was measured at 25°C using a pH meter (HM-30R, manufactured by TOA DKK Co., Ltd.).

[0205] (Examples 12 to 18)

[0206] According to the compositions and contents shown in Table 2 and Table 3 below, a liquid skin cleanser composition was prepared according to the following method.

[0207] In preparing the liquid skin cleanser compositions of Examples 1 to 11 and 19 to 32, the anionic surfactant (A) component was dissolved, and when the cationic polymer (B) component and the polyethylene glycol (C) component were added, the liquid skin cleanser compositions of Examples 12 to 18 were prepared in the same manner as in the preparation of the liquid skin cleanser compositions of Examples 1 to 11 and 19 to 32, except that the copolymer (D) component was also added.

[0208] The obtained liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10 were filled in a pump-type foaming container with a dispenser (discharge volume 3 mL, manufactured by Yoshino Industries, Ltd.) and used for the following evaluation.

[0209] The liquid skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 10 were evaluated and judged in terms of "foam persistence", "skin smoothness during rinsing", "skin elasticity after towel drying", "tight feeling of skin after towel drying", and "low temperature stability" as described below. The results are shown in Tables 1 to 5 below.

[0210] <Foam persistence>

[0211] Ten professional evaluators squeezed each of the liquid skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 10 twice (about 6 g), took them on a nylon towel (OUR STAR soft bath towel, manufactured by Kikulon), washed their whole bodies, and observed the "foam persistence" and evaluated them according to the following evaluation criteria. The results were averaged by the scores of the ten professional evaluators, and the evaluation was performed according to the following evaluation criteria for the average score.

[0212] -Evaluation criteria for "foam durability"-

[0213] 4 points: When you finish washing your body, almost all the foam you had when you started washing remains.

[0214] 3 points: When washing is finished, about 80% to 50% of the foam on the body remains when washing began

[0215] 2 points: When washing is finished, about 20% to 40% of the foam on the body remains when washing began

[0216] 1 point: When washing the body, almost no foam remains from when washing began.

[0217] - Criteria for judging "foam persistence" -

[0218] ◎: The average score is above 3.5 and below 4.0

[0219] ○: The average score is above 3.0 and below 3.5

[0220] △: The average score is above 2.0 and below 3.0

[0221] ×: The average score is less than 2.0 points

[0222] <Skin smoothness when washing>

[0223] Ten professional evaluators squeezed each liquid skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 10 5 times (about 15 g) and took it into their hands, washed their whole bodies with their hands, and then evaluated the "smoothness of the skin when rinsing" when rinsing with warm water at 40°C according to the following evaluation criteria. The results were averaged by the scores of the ten professional evaluators, and judged according to the following average judgment criteria.

[0224] -Evaluation criteria for "skin smoothness during rinsing"-

[0225] 4 points: Strong feeling of skin smoothness

[0226] 3 points: Feel the smoothness of the skin

[0227] 2 points: Slightly feel the smoothness of the skin

[0228] 1 point: No feeling of skin smoothness

[0229] - Criteria for judging the smoothness of the skin during washing -

[0230] ◎: The average score is above 3.5 and below 4.0

[0231] ○: The average score is above 3.0 and below 3.5

[0232] △: The average score is above 2.0 and below 3.0

[0233] ×: The average score is less than 2.0 points

[0234] <Elasticity of skin after towel drying>

[0235] Ten professional evaluators squeezed each liquid skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 10 5 times (about 15 g) and took it in their hands, washed their whole bodies with their hands, rinsed with warm water at 40°C, and dried with a towel. Then, after standing in a constant temperature room at 24°C for 30 minutes, they evaluated the "elasticity of the skin after drying with a towel" according to the following evaluation criteria. The results were averaged by the scores of the ten professional evaluators, and the evaluation was performed according to the following average judgment criteria.

[0236] -Evaluation criteria for "elasticity of skin after towel drying"-

[0237] 4 points: When pressing the forearm with the palm, the skin can be strongly rebounded.

[0238] 3 points: Feel the skin rebound when pressing the forearm with the palm of your hand

[0239] 2 points: When pressing the forearm with the palm, the skin can be slightly rebounded.

[0240] 1 point: No rebound sensation of the skin can be felt when pressing the forearm with the palm of the hand

[0241] - Criteria for judging the elasticity of skin after towel drying -

[0242] ◎: The average score is above 3.5 and below 4.0

[0243] ○: The average score is above 3.0 and below 3.5

[0244] △: The average score is above 2.0 and below 3.0

[0245] ×: The average score is less than 2.0 points

[0246] <The feeling of tightness in the skin after towel drying>

[0247] Ten professional evaluators squeezed each liquid skin cleanser composition of Examples 1 to 32 and Comparative Examples 1 to 10 5 times (about 15 g) and took it in their hands, washed their whole bodies with their hands, rinsed with warm water at 40°C, and dried with a towel. Then, after standing in a constant temperature room at 24°C for 30 minutes, they evaluated the "elasticity of the skin after drying with a towel" according to the following evaluation criteria. The results were obtained by calculating the average score of the above 10 professional evaluators, and judging was performed according to the following judgment criteria for the average score.

[0248] -Evaluation criteria for "how tight the skin feels after towel drying"-

[0249] 4 points: No sense of skin tightness at all

[0250] 3 points: Slightly feel the skin tightening

[0251] 2 points: The skin feels obviously tight

[0252] 1 point: The skin feels very tight

[0253] - Criteria for judging the feeling of tightness of the skin after towel drying -

[0254] ◎: The average score is above 3.5 and below 4.0

[0255] ○: The average score is above 3.0 and below 3.5

[0256] △: The average score is above 2.0 and below 3.0

[0257] ×: The average score is less than 2.0 points

[0258] <Low Temperature Stability>

[0259] About 50 g of each of the liquid skin cleanser compositions of Examples 1 to 32 and Comparative Examples 1 to 10 were placed in a cylindrical transparent glass bottle (4 cm in diameter, 7.5 cm in height) and stored in a thermostatic chamber at -5°C for 2 weeks. Professional evaluators visually observed the state of precipitate formation in the liquid skin cleanser compositions after storage for 2 weeks and made judgments based on the following judgment criteria.

[0260] - Criteria for judging "low temperature stability" -

[0261] ◎: No crystals or solid precipitation were observed within 2 weeks

[0262] ○: Almost no crystals or solid precipitation were observed within 2 weeks (no problem in terms of commercial value)

[0263] ×: Large amounts of crystals or solid precipitation were observed within 2 weeks

[0264]

Table 1

[0265]

[0266]

Table 2

[0267]

[0268]

Table 3

[0269]

[0270]

Table 4

[0271]

[0272]

Table 5

[0273]

[0274] The detailed information of each component used in Examples 1 to 32 and Comparative Examples 1 to 10 is shown in Table 6 below.

[0275]

Table 6

[0276]

[0277] *1: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).

[0278] *2: Potassium myristic acid used was obtained by neutralizing myristic acid (NAA-142, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).

[0279] *3: Potassium palmitate was prepared by neutralizing palmitic acid (NAA-160, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).

[0280] *4: Potassium stearate was prepared by neutralizing stearic acid (NAA-180, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).

[0281] [Possible industrial applications]

[0282] The liquid skin cleanser composition can be applied to a foaming container, has excellent foam durability, does not feel tightness on the skin after towel drying, has good smoothness when rinsing, and has good elasticity on the skin after towel drying, and has excellent low-temperature stability. Therefore, it can be used in body wash, body soap, facial cleanser, hand soap, foam hand soap, cleansing foam, makeup remover, etc., and is particularly suitable for body soap used by foaming with a cleaning tool such as a nylon towel or a cotton towel.

Claims

1. A liquid skin cleanser composition, characterized in that contain: (A) an anionic surfactant comprising at least one selected from (a1) palmitic acid salts and (a2) stearic acid salts, (B) at least one cationic polymer selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers, and (C) polyethylene glycol having an average molecular weight of 190 to 630, The content of the component (A) is 10% to 25% by mass. The molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer as the component (B) is 40 mol% or more, The mass ratio of the content of the component (A) to the content of the component (C) [(A) / (C)] is 15 to 100, The mass ratio of the total content of the palmitic acid salt (a1) and the stearic acid salt (a2) to the content of the component (A) [((a1)+(a2)) / (A)] is 0.1 to 0.5, The content of the component (B) is 0.1% to 1% by mass. The liquid skin cleanser composition is filled in a foaming container.

2. The liquid skin cleanser composition according to claim 1, further comprising (D) a copolymer represented by the following general formula (1): in, In the general formula (1), n, m and z represent the molar ratio (mol %) of each structural unit, n+m+z=100, n is 0-34, m is 24-31, and z is 35-76.

3. The liquid skin cleanser composition according to claim 2, wherein the content of the component (B) is 0.2 to 0.8% by mass, the content of the component (C) is 0.2 to 0.8% by mass, and the content of the component (D) is 0.05 to 0.3% by mass.

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