Liquid skin cleansing composition

Abstract

To provide a liquid skin cleansing composition which is superior in foam richness, moisture sensation on the towel-dried skin, and a mild effect on the skin, and also ensures ease of discharge from a container.SOLUTION: A liquid skin cleansing composition comprises: (A) an anionic surfactant; (B) an amphoteric surfactant; (C) at least one selected from the group consisting of pyrrolidonecarboxylic acid or a salt thereof, pyrrolidonecarboxylic acid alkyl ester, urea, citrulline, cetyl hydroxyproline palmitamide, and N-acetyl-hydroxyproline; and (D) a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, wherein a mass ratio of the total content of components (A) and (B) to the content of component (C), [(A)+(B)] / (C), is 22 or more and 250 or less, and the composition is packaged in a foamer container.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Conventionally, liquid skin cleansing compositions such as body soaps have tended to be required to have good foaming performance and a refreshing feeling after washing. In recent years, however, there has been an increasing demand and interest in the moisturizing power to maintain a moist feeling and the mildness to care gently for the skin. For this reason, there is a demand for a liquid skin cleansing composition that achieves both good foam quality, moisturizing power, and mildness to the skin.

[0003] As a conventional technique, for example, a cleansing agent containing a fatty acid (anionic surfactant) and an amphoteric surfactant in a specific blending ratio has been proposed for the purpose of providing a cleansing agent with good foaming and low skin irritation (see Patent Document 1). However, since the amphoteric surfactant blended in the cleansing agent has a strong action of eluting intercellular lipids, there has been a concern about the mildness to the skin in the conventional technique including the cleansing agent of Patent Document 1. Also, for the purpose of providing a skin cleansing composition with good foaming and creaminess and less irritation to the skin, a skin cleansing composition containing a higher fatty acid salt (C14 or higher), a dimethyldiallylammonium chloride-acrylamide copolymer, and polyethylene glycol has been proposed (see Patent Document 2). However, in the conventional technique including the skin cleansing composition of Patent Document 2, there has been room for further improvement in foam performance such as the density of the foam.

[0004] Therefore, it is desired to provide a liquid skin cleansing composition that is excellent in foam density, the moist feeling on the skin after towel drying, mildness to the skin, and dischargeability from the container.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] An object of the present invention is to solve the above-mentioned conventional problems and achieve the following object. That is, an object of the present invention is to provide a liquid skin cleansing composition that is excellent in foam density, moist feeling on the skin after towel drying, mildness to the skin, and dischargeability from a container. [Means for Solving the Problems]

[0007] The present invention is a liquid skin cleansing composition containing (A) an anionic surfactant, (B) an amphoteric surfactant, (C) one or more selected from pyrrolidonecarboxylic acid or its salt, pyrrolidonecarboxylic acid alkyl ester, urea, citrulline, cetyl hydroxyproline palmitide, and N-acetyl-hydroxyproline, and (D) a cationic polymer having a structural unit derived from dimethyldiallylammonium chloride in an amount of 40 mol% or more, wherein the mass ratio [{(A)+(B)} / (C)] of the total content of the (A) component and the (B) component to the content of the (C) component is 22 or more and 250 or less, and is filled in a former container.

[0008] The present invention is based on the findings of the present inventor, and the means for solving the above problems are as follows. That is, <1> (A) an anionic surfactant, (B) an amphoteric surfactant, (C) one or more selected from pyrrolidonecarboxylic acid or its salt, pyrrolidonecarboxylic acid alkyl ester, urea, citrulline, cetyl hydroxyproline palmitide, and N-acetyl-hydroxyproline, A liquid skin cleansing composition containing a cationic polymer containing 40 mol% or more of a structural unit derived from dimethyldiallylammonium chloride. The mass ratio [{(A) + (B)} / (C)] of the total content of the component (A) and the component (B) to the content of the component (C) is 22 or more and 250 or less. A liquid skin cleansing composition characterized by being filled in a former container. <2> The content of the component (A) is 10% by mass or more and 25% by mass or less based on the total amount of the liquid skin cleansing composition. The content of the component (B) is 1% by mass or more and 6% by mass or less based on the total amount of the liquid skin cleansing composition. The content of the component (C) is 0.1% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition. The content of the component (D) is 0.1% by mass or more and 0.8% by mass or less based on the total amount of the liquid skin cleansing composition. The liquid skin cleansing composition according to <1>.

Advantages of the Invention

[0009] According to the present invention, a liquid skin cleansing composition excellent in foam density, moist feeling on the skin after towel drying, mildness to the skin, and dischargeability from the container can be provided.

Embodiments for Carrying Out the Invention

[0010] (Liquid Skin Cleansing Composition) The liquid skin cleansing composition of the present invention contains (A) an anionic surfactant, (B) an amphoteric surfactant, (C) one or more selected from pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, urea, citrulline, cetyl hydroxyproline palmitide, and N-acetyl-hydroxyproline, and (D) a cationic polymer containing 40 mol% or more of a structural unit derived from dimethyldiallylammonium chloride, and may contain other components as necessary. In this specification, "(A) anionic surfactant" may be referred to as "(A)" or "(A) component", "(B) amphoteric surfactant" may be referred to as "(B)" or "(B) component", and "one or more selected from (C) pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, urea, citrulline, cetyl hydroxyproline palmitide, and N-acetyl-hydroxyproline" may be referred to as "(C)" or "(C) component", and "(D) cationic polymer having a structural unit derived from dimethyldiallylammonium chloride in an amount of 40 mol% or more" may be referred to as "(D)" or "(D) component".

[0011] <(A) anionic surfactant> The (A) anionic surfactant imparts good foam density to the liquid skin cleansing composition.

[0012] The (A) anionic surfactant is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good foam density, fatty acid salts containing laurate, alkyl sulfates, and polyoxyethylene (POE) alkyl ether sulfates are preferred, and fatty acid salts containing laurate are more preferred. These may be used alone or in combination of two or more.

[0013] - Fatty acid salt - The fatty acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include laurate, myristate, palmitate, stearate, and the like. These may be used alone or in combination of two or more. When two or more are used in combination, it is preferable to contain at least laurate from the viewpoint of good foam density. In other words, the fatty acid preferably contains laurate and one or more selected from myristate, palmitate, and stearate. The fatty acid salt preferably does not contain an unsaturated fatty acid or its salt.

[0014] The counter ion in the fatty acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples 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 include sodium salts, potassium salts, and the like. The amine salt is not particularly limited and can be appropriately selected according to the purpose. Examples include ammonium salts; alkanolamine salts such as monoethanolamine salt, diethanolamine salt, triethanolamine salt, 2-amino-2-methylpropanol, 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 include lysine salts, arginine salts, and the like. Among these, alkali metal salts are preferred, and potassium salts are more preferred.

[0015] The fatty acid salt can be blended as a fatty acid salt, or the fatty acid and the salt serving as the counter ion can be separately added to the blending tank and subjected to a neutralization reaction to obtain a fatty acid salt.

[0016] For the fatty acid used in the preparation of the fatty acid salt, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the fatty acid include, by trade name, NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA (registered trademark)-142 (myristic acid, manufactured by NOF Corporation), NAA (registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), NAA (registered trademark)-180 (stearic acid, manufactured by NOF Corporation), and the like.

[0017] The fatty acid salt may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available products of the fatty acid salt include, for example, under the trade name, NIKKOL Potassium Laurate LK-120 (Potassium Laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL Potassium Myristate MK-140 (Potassium Myristate, manufactured by Nikko Chemicals Co., Ltd.), Nonceal PK-1 (Potassium Palmitate, manufactured by NOF Corporation), Nonceal SK-1 (Potassium Stearate, manufactured by NOF Corporation), Tyson Soap MNK-40 (a liquid mixture of Potassium Coconut Fatty Acid and Potassium Myristate, manufactured by Nikko Chemicals Co., Ltd.), and the like.

[0018] -Alkyl Sulfate- The alkyl sulfate is not particularly limited and can be appropriately selected according to the purpose. Examples include compounds represented by the following general formula (A2). R2OSO3M2 ··· General formula (A2) (However, in the general formula (A2), R2 represents an alkyl group having 10 to 18 carbon atoms, and M2 represents any one of an alkali metal, ammonium, and alkanolamine.)

[0019] Specific examples of the alkyl sulfate include lauryl sulfate, cocoalkyl sulfate, and the like.

[0020] The alkyl sulfate may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available products of the alkyl sulfate include, for example, under the trade name, Texapon ALS 70 (Ammonium Lauryl Sulfate, manufactured by BASF), Texapon K12 (Sodium Lauryl Sulfate, manufactured by BASF), and the like.

[0021] -Polyoxyethylene (POE) Alkyl Ether Sulfate- The polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected according to the purpose. For example, compounds represented by the following general formula (A1) can be mentioned. The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more.

[0022]

Chemical formula

[0023] In the general formula (A1), R 7 represents an alkyl group. The number of carbon atoms in the alkyl group part is preferably 10 to 14. In the general formula (A1), n represents the average number of moles of ethylene oxide (E.O.) added. The average number of moles of ethylene oxide added is preferably 1 to 5. In the general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected according to the purpose. For example, sodium, potassium, etc. can be mentioned.

[0024] Specific examples of the polyoxyethylene alkyl ether sulfate include polyoxyethylene capryl ether sulfate (EO: 1 to 3), polyoxyethylene lauryl ether sulfate (EO: 1 to 3), polyoxyethylene myristyl ether sulfate (EO: 1 to 3), polyoxyethylene palmityl ether sulfate (EO: 1 to 3), polyoxyethylene stearyl ether sulfate (EO: 1 to 3), etc.

[0025] The polyoxyethylene alkyl ether sulfate may be a synthesized product used as appropriate or a commercially available product. Examples of commercially available products of the polyoxyethylene alkyl ether sulfate include, for example, under the trade name, Emal 170J (sodium polyoxyethylene lauryl ether sulfate, EO: 1, manufactured by Kao Corporation), Shinorin SPE-1250 (sodium polyoxyethylene lauryl ether sulfate, EO: 2, manufactured by Shin Nippon Rika Co., Ltd.), Emal 20T (triethanolamine polyoxyethylene lauryl ether sulfate, EO: 3, manufactured by Kao Corporation), Teikapo NE1270 (ammonium polyoxyethylene lauryl ether sulfate, EO: 3, manufactured by Teika Co., Ltd.), and the like.

[0026] The content of the component (A) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of good foam denseness, a moist feeling on the skin after towel drying, and mildness to the skin, it is preferably 5% by mass or more and 25% by mass or less, more preferably 10% by mass or more and 25% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (A) is 5% by mass or more based on the total amount of the liquid skin cleansing composition, the foam denseness and the moist feeling on the skin after towel drying are good. When the content of the component (A) is 25% by mass or less based on the total amount of the liquid skin cleansing composition, the mildness to the skin is good.

[0027] <(B) Amphoteric surfactant> The (B) amphoteric surfactant imparts good foam denseness to the liquid skin cleansing composition.

[0028] The component (B) is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include amino acid-based amphoteric surfactants and betaine-based amphoteric surfactants.

[0029] - Amino acid-based amphoteric surfactant - The amino acid-based amphoteric surfactant is not particularly limited and can be appropriately selected according to the purpose. For example, sodium lauryl aminopropionate, sodium lauryl aminodipropionate, sodium cocoamphoacetate, disodium cocoamphodiacetate, sodium lauroamphoacetate, etc. can be mentioned. Among these, from the viewpoint of good foam density, sodium lauryl aminopropionate and sodium lauryl aminodipropionate are preferred. These may be used alone or in combination of two or more.

[0030] As the amino acid-based amphoteric surfactant, those synthesized appropriately may be used, or commercially available products may be used. Examples of commercially available products of the amino acid-based amphoteric surfactant include, for example, under the trade name, Levon APL (β-sodium lauryl aminopropionate, manufactured by Sanyo Chemical Industries, Ltd.).

[0031] - Betaine-based amphoteric surfactant - The betaine-based amphoteric surfactant is not particularly limited and can be appropriately selected according to the purpose. For example, lauric acid amide propyl betaine, lauryl dimethylaminoacetic acid betaine, cocoamidopropyl betaine, palm kernel fatty acid amide propyl betaine, lauryl hydroxysulfobetaine, lauramide propyl hydroxysulfobetaine, cocoamidopropyl hydroxysulfobetaine, etc. can be mentioned. Among these, from the viewpoint of good foam density, lauric acid amide propyl betaine, lauryl dimethylaminoacetic acid betaine, cocoamidopropyl betaine are preferred. These may be used alone or in combination of two or more.

[0032] As for the betaine-based amphoteric surfactant, a synthesized product may be used as appropriate, or a commercially available product may be used. Examples of commercially available products of the betaine-based amphoteric surfactant include, for example, Amogent-SH (lauryldimethylaminoacetic acid betaine, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and Enacol L-30B (lauric acid amidopropyl betaine, manufactured by Lion Specialty Chemicals Co., Ltd.) under their trade names.

[0033] The content of the component (B) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of good foam denseness and mildness to the skin, it is preferably 0.5% by mass or more and 10% by mass or less, more preferably 1% by mass or more and 6% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (B) is 0.5% by mass or more based on the total amount of the liquid skin cleansing composition, the foam denseness is good. When the content of the component (B) is 10% by mass or less based on the total amount of the liquid skin cleansing composition, the mildness to the skin is good.

[0034] <One or more selected from (C) pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, urea, citrulline, cetyl hydroxyproline palmitate, and N-acetyl-hydroxyproline> The component (C) imparts a moist feeling to the skin after towel drying with respect to the liquid skin cleansing composition.

[0035] As the component (C), pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, and urea are preferable from the viewpoint of good moist feeling on the skin after towel drying.

[0036] The component (C) may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available products of the component (C) include, by trade name, AJIDEW (registered trademark) A-100 (pyrrolidone carboxylic acid, manufactured by Ajinomoto Health Supply Co., Ltd.), AJIDEW (registered trademark) NL-50 (sodium pyrrolidone carboxylate, manufactured by Ajinomoto Health Supply Co., Ltd.), AJIDEW (registered trademark) ZN-100 (zinc L-pyrrolidone carboxylate, manufactured by Ajinomoto Health Supply Co., Ltd.), LAURYDONE (lauryl pyrrolidone carboxylate, manufactured by Nikko Chemicals Co., Ltd.), urea (manufactured by Hanwa Kogyo Co., Ltd.), L-citrulline (manufactured by Miyako Chemical Co., Ltd.), Ceramide Bio (cetyl hydroxyproline palmitide, manufactured by Iwase Kosfa Co., Ltd.), N-acetyl-L-hydroxyproline (N-acetyl-hydroxyproline, manufactured by Kyowa Hakko Bio Co., Ltd.), and the like.

[0037] The content of the component (C) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of the moist feeling on the skin after towel drying, mildness to the skin, and good dischargeability from the container, it is preferably 0.1% by mass or more and 1.5% by mass or less, more preferably 0.1% by mass or more and 1% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (C) is 0.1% by mass or more based on the total amount of the liquid skin cleansing composition, the moist feeling on the skin after towel drying and the mildness to the skin are good. When the content of the component (C) is 1.5% by mass or less based on the total amount of the liquid skin cleansing composition, the dischargeability from the container is good.

[0038] <Cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride> The component (D) imparts a moist feeling to the skin after towel drying to the liquid skin cleansing composition.

[0039] The component (D) is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers. Specific examples of the component (D) include compounds represented by the following general formula (B1).

[0040] [Chemical formula] However, in the general formula (B1), n and m represent the molar ratios (mol%) of each structural unit, n + m = 100, and it is preferable that m is 40 mol% or more.

[0041] From the viewpoint of achieving a good moist feeling on 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 40 mol% or more, more preferably 65 mol% or more, and even more preferably 90 mol% or more. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more.

[0042] The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer 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.)

[0043] The weight average molecular weight of the component (D) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of achieving a good moist feeling on the skin after towel drying, it is preferably 10,000 or more and 1,000,000 or less, and more preferably 15,000 or more and 450,000 or less. The weight-average molecular weight of the component (D) 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).

[0044] In a solution of 30% to 44% by mass of the solid content of the component (D), the viscosity at 25 °C is preferably 10 mPa·s or more and 15,000 mPa·s or less, and more preferably 20 mPa·s or more and 12,000 mPa·s or less. The viscosity can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0045] As the component (D), those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the component (D) include the following by trade name.

[0046] Merquat 100 (component name: dimethyldiallylammonium chloride polymer, manufactured by Nippon Lubrizol Corporation, viscosity at 25 °C of a 39% to 44% by mass solid content: 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 No. 3 spindle rotor under the condition of 6 revolutions per minute.

[0047] Merquat 106 (component name: dimethyldiallylammonium chloride polymer, manufactured by Nippon Lubrizol Corporation, viscosity at 25 °C of a 30% to 36% by mass solid content: 20 mPa·s to 65 mPa·s, weight-average molecular weight: 15,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25 °C using a No. 1 spindle rotor under the condition of 60 revolutions per minute.

[0048] Markote 280 (Component name: Dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Ltd., viscosity at 25°C with a solid content of 39% by mass to 43% by mass: 3,000 mPa·s to 6,000 mPa·s, weight average molecular weight: 450,000, n:m = 35:65 (molar ratio) in the general formula (B1), molar ratio of the structural unit derived from dimethyldiallylammonium chloride is 65 mol%). The viscosity can be measured at 25°C using a Brookfield viscometer LVF (manufactured by Brookfield) with a No. 4 spindle rotor under the condition of 60 revolutions per minute.

[0049] Markote 295 (Component name: Dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Ltd., viscosity at 25°C with a solid content of 35% by mass to 40% by mass: 3,500 mPa·s to 9,000 mPa·s, weight average molecular weight: 190,000, n:m = 5:95 (molar ratio) in the general formula (B1), molar ratio of the structural unit derived from dimethyldiallylammonium chloride is 95 mol%). The viscosity can be measured at 25°C using a Brookfield viscometer LVF (manufactured by Brookfield) with a No. 4 spindle rotor under the condition of 30 revolutions per minute.

[0050] The content of the component (D) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of the moist feeling on the skin after towel drying and good dischargeability from the container, it is preferably 0.1% by mass or more and 1% by mass or less, more preferably 0.1% by mass or more and 0.8% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (D) is 0.1% by mass or more based on the total amount of the liquid skin cleansing composition, the moist feeling on the skin after towel drying is good. When the content of the component (D) is 1% by mass or less based on the total amount of the liquid skin cleansing composition, the dischargeability from the container is good.

[0051] <Mass ratio [(A) + (B) / (C)]> In the liquid skin cleansing composition of the present invention, the mass ratio [{(A)+(B)} / (C)] of the total content of the component (A) and the component (B) to the content of the component (C) is 22 or more and 250 or less. As the mass ratio [{(A)+(B)} / (C)], from the viewpoint of good foam density, mildness to the skin, and dischargeability from the container, 22 or more and 230 or less are preferable. When the mass ratio [{(A)+(B)} / (C)] is 22 or more, the foam density and the dischargeability from the container become good. When the mass ratio [{(A)+(B)} / (C)] is 250 or less, the mildness to the skin becomes good.

[0052] <Other components> In addition to the components (A), (B), (C), and (D), other components can be blended as necessary within a range not impairing the effects of the present invention in the liquid skin cleansing composition. Examples of the other components include surfactants other than the component (A) and the component (B), water-soluble polymers other than the component (D), oils, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, amino acids, drugs such as vitamins, bactericides, moisturizers, preservatives, pH adjusters such as potassium hydroxide, citric acid, hydrochloric acid, antioxidants, sequestering agents, ultraviolet absorbers, ultraviolet scattering agents, animal and plant extracts or their derivatives, chelating agents such as edetic acid, dyes, fragrances, pigments, inorganic powders, clay minerals, and water-insoluble polymer compound powders such as nylon and polyethylene. These may be used alone or in combination of two or more. As the other components, those synthesized as appropriate may be used, or commercially available products may be used. The content of the other components in the liquid skin cleansing composition is not particularly limited and can be appropriately selected according to the purpose.

[0053] 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 oil, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grape seed oil, avocado oil, etc. and their ester compounds, animal oils and fats such as mink oil, egg yolk oil, etc., waxes such as beeswax, sperm whale wax, lanolin, hydrogenated lanolin, carnauba wax, candelilla wax, etc., hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, petrolatum, etc., natural and synthetic fatty acids such as oleic acid, isostearic acid, behenic acid, etc., esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, cholesterol oleate, etc. may be mentioned. 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 liquid skin cleansing composition.

[0054] 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. may be mentioned. 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 10% by mass or less based on the total amount of the liquid skin cleansing composition.

[0055] There are no particular restrictions on the moisturizing agent, 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, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, polyglycerins, etc. can be mentioned. These may be used alone or in combination of two or more.

[0056] There are no particular restrictions on the preservative, and it can be appropriately selected according to the purpose. For example, benzoates, sorbates, dehydroacetates, paraoxybenzoic acid esters, 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. can be mentioned. These may be used alone or in combination of two or more. As for the content of the preservative, there are no particular restrictions 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 liquid skin cleansing agent composition.

[0057] 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. can be mentioned. These may be used alone or in combination of two or more. As for the content of the antioxidant, there are no particular restrictions 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 liquid skin cleansing agent composition.

[0058] The chelating agent is not particularly limited and can be appropriately selected according to the purpose. For example, disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. can be mentioned. These may be used alone or in combination of two or more. The content of the chelating agent 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 1% by mass or less based on the total amount of the liquid skin cleansing composition.

[0059] The pH adjuster is not particularly limited and can be appropriately selected according to the purpose. For example, sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, etc. can be mentioned. These may be used alone or in combination of two or more.

[0060] The ultraviolet absorber and the ultraviolet scattering agent are not particularly limited and can be appropriately selected according to the purpose. For example, 2-hydroxy-4-methoxybenzophenone, octyldimethyl para-aminobenzoate, ethylhexyl paramethoxysalicylate, titanium oxide, kaolin, talc, etc. can be mentioned. These may be used alone or in combination of two or more.

[0061] The vitamins are not particularly limited and can be appropriately selected according to the purpose. For example, 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. can be mentioned. These may be used alone or in combination of two or more. As the content of the vitamins, there is no particular limitation 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 liquid skin cleansing composition.

[0062] Examples of the amino acids include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and derivatives thereof. These may be used alone or in combination of two or more. As the content of the amino acids, there is no particular limitation 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 liquid skin cleansing composition.

[0063] There is no particular limitation on the fragrance, and it can be appropriately selected according to the purpose. For example, fragrance compositions A to D described in paragraphs

[0065] to

[0071] of JP-A-2002-128658, fragrance compositions A to E described in paragraphs

[0076] to

[0088] of JP-A-2003-73249, or compounded fragrance compositions 1 to 4 described in paragraphs

[0016] to

[0023] of JP-A-2020-132680 can be used.

[0064] -pH- The pH of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected according to the purpose. However, it is preferably 9.5 or more and 11.0 or less, and more preferably 9.8 or more and 10.6 or less. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (electrode type GST-5721, manufactured by Toa DKK Corporation).

[0065] -Viscosity- The viscosity of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of good foam density and dischargeability from the container, it is preferably 5 mPa·s or more and 30 mPa·s or less, and more preferably 15 mPa·s or more and 25 mPa·s or less. The method for measuring the viscosity is not particularly limited. For example, there is 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 viscometer (manufactured by Tokyo Keiki Co., Ltd.).

[0066] -Former container- The liquid skin cleansing composition is filled in a former container and is of a type that is discharged in a foamy state from the former container. In this specification, the "former container" may sometimes be simply referred to as the "container". The former container is not particularly limited and can be appropriately selected from known former containers. For example, there are non-gas type foam discharge containers, aerosol containers using a propellant and a pressure-resistant container, etc. Among these, non-gas type foam discharge containers are preferred.

[0067] The non-gas type foam discharge container is not particularly limited as long as it can mix the liquid skin cleansing composition with air and discharge it in a foamy state, and can be appropriately selected according to the purpose. For example, there are squeeze former containers that can discharge foam by squeezing the bottle body by hand, pump former containers that can discharge foam by pressing down the nozzle part, etc. Such former containers can use, for example, those manufactured by Daiwa Can Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, as the former container, former containers described in JP-A-7-315463, JP-A-8-230961, JP-A-2005-193972, etc. can be used.

[0068] The non-gas type foam discharge container usually has a porous membrane body for forming foam, and foam is formed when the liquid skin cleansing 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 preferred.

[0069] The mesh of the porous membrane body is not particularly limited and can be appropriately selected according to the purpose, but 100 mesh or more is preferred, 100 mesh to 400 mesh is more preferred, and 200 mesh to 305 mesh is even more preferred. Also, the number of the porous membrane bodies is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of improving the foaming performance, 2 to 4 sheets are preferred. More specifically, the former containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972 can be preferably used. For example, when using the liquid skin cleansing agent composition with a pump former container having one 305-mesh porous membrane body and one 200-mesh porous membrane body respectively, the viscosity of the liquid skin cleansing agent composition under room temperature conditions of 25°C is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

[0070] - Manufacturing method - The manufacturing method of the liquid skin cleansing agent composition of the present invention is not particularly limited and can be appropriately selected according to the purpose. The component (A), the component (B), the component (C), and the component (D), and if necessary, the other components and purified water (formulated as the remaining amount so that the total of the liquid skin cleansing agent composition is 100% by mass) can be mixed to obtain it. Specifically, it can be manufactured as follows. After dissolving the component (A) in purified water heated to 70°C to 80°C, cooling it to 40°C or lower, and then adding the component (B), the component (C), and the component (D).

[0071] The liquid 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 that have a shearing force and can mix 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 disperser, etc. can be mentioned.

[0072] - Use - The application site and method of use of the liquid skin cleansing composition are 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. in a normal method of use.

[0073] The uses of the liquid skin cleansing composition are not particularly limited and can be appropriately selected according to the purpose. For example, body shampoo, body soap, facial cleansing foam, hand soap, foaming hand soap, cleansing foam, makeup remover, etc. can be mentioned.

Examples

[0074] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples in any way. The content of each component described in the Examples and Comparative Examples is shown in "mass%", the total amount is 100 mass%, and all are values converted to pure components.

[0075] (Examples 1 to 24 and Comparative Examples 1 to 15) The liquid skin cleansing compositions having the compositions and contents shown in Examples 1 to 24 and Comparative Examples 1 to 15 were prepared according to the following method. Specifically, 95% by mass of purified water of the finally obtained liquid skin cleansing composition was heated to 70°C to 80°C, the component (A) was dissolved, and then cooled to 40°C or lower, and then the component (B), the component (C), and the component (D), and other components as necessary were added. When the predetermined pH was not reached, potassium hydroxide, which is another component, was added to adjust the pH to 10.0, and then purified water was added so that the total amount became 100% by mass to obtain each liquid skin cleansing composition. In addition, a propeller was used as the stirring blade, and stirring was carried out using a three-one motor (HEIDON BL1200, manufactured by Shinto Kagaku Co., Ltd.). The pH was measured at 25 °C using a pH meter (HM-30R, manufactured by TOA DKK). In addition, the obtained liquid skin cleansing agent compositions of Examples 1 to 24 and Comparative Examples 1 to 15 were filled into a container with a foamer pump dispenser [discharge amount 1 mL, manufactured by Yoshino Kogyosho Co., Ltd.].

[0076] For each liquid skin cleansing agent composition, "foam density", "moist feeling on the skin after towel drying", "mildness to the skin", and "dischargeability from the container" were evaluated and judged as follows. The results are shown in Tables 1 to 5 below.

[0077] <Evaluation of foam density> Ten professional evaluators took about 15 g (5 pushes) of each liquid skin cleansing agent composition in their hands and washed their whole bodies. After washing, the foam was taken in the hand, and the foam density (foam touch and resistance to dripping) was evaluated 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 judgment criteria for the average score. - Evaluation criteria - 4 points: The foam is hard and does not drip even when the hand is turned upside down. 3 points: The foam is slightly hard and does not drip even when the hand is turned upside down. 2 points: The foam is slightly soft and is slightly likely to drip when the hand is turned upside down. 1 point: The foam is soft and drips when the hand is turned upside down. - Judgment criteria - ◎: 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

[0078] <Evaluation of the moist feeling on the skin after towel drying> Ten professional evaluators each took 2 pushes (about 6 g) of each liquid skin cleanser composition on a nylon towel (Awaste Turbo Body Towel, Kikuron Co., Ltd., or seaweed), washed their whole bodies, and then rinsed with warm water at 40 °C. After towel drying, they rested quietly for 30 minutes in a constant temperature room at 38 °C, and then evaluated the "skin moist feeling" 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 - 4 points: There is a very strong moist feeling. 3 points: There is a moist feeling. 2 points: There is a somewhat moist feeling. 1 point: There is no moist feeling. - Judgment Criteria - ◎: 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

[0079] <Evaluation of Mildness to Skin> Ten professional evaluators with sensitive skin wore a cup shaker on the inner part of their forearms, poured 4 mL of each liquid skin cleanser composition adjusted to 38 °C, and then tapped with a glass rod for 1 minute. Next, each liquid skin cleanser composition was removed with a dropper, 4 mL of tap water was added, shaken for 30 seconds, and then the tap water was removed. This operation was repeated twice. The irritation feeling (such as stinging and itching) on the skin after washing was evaluated by sensory evaluation 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 - 4 points: No irritation is felt at all. 3 points: Little irritation is felt. 2 points: Irritation is felt. 1 point: Strong irritation is felt. - Judgment Criteria - ◎: 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

[0080] <Evaluation of Dischargeability from Container> Ten professional evaluators evaluated the ease of pumping and the fineness of the foam during discharge at 25°C based on the following evaluation criteria. The results were obtained by calculating the average score of the ten professional evaluators and judged based on the following criteria for the average score. Note that a score of "△" or higher was considered a pass. - Evaluation Criteria - 4 points: The pump is easy to operate, and fine bubbles are discharged. 3 points: The pump is easy to operate, but there are slightly mixed large-particle bubbles. 2 points: The pump is slightly difficult to operate, and there are many mixed large-particle bubbles. 1 point: The pump is very difficult to operate, and only large-particle bubbles are discharged. - Judgment Criteria - ◎: 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

[0081]

Table 1

[0082]

Table 2

[0083]

Table 3

[0084]

Table 4

[0085]

Table 5

[0086] (Formulation Examples 1 - 6) A liquid skin cleansing agent composition having the composition and content shown in Table 6 below was prepared in the same manner as in Example 1.

[0087] [Table 6]

[0088] Details of each component used in Examples 1 to 24, Comparative Examples 1 to 15, and Formulation Examples 1 to 6 are shown in Table 7 below.

[0089] [Table 7] [Industrial Applicability]

[0090] The liquid skin cleansing agent composition is excellent in foam density, moist feeling on the skin after towel drying, and mildness to the skin, and also excellent in dischargeability from the container. Therefore, for example, it can be used in body shampoos, body soaps, facial cleansing foams, hand soaps, foam hand soaps, cleansing foams, makeup removers, etc., and can be particularly preferably used in body soaps.

Claims

1. (A) an anionic surfactant, (B) an amphoteric surfactant, (C) one or more selected from pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, urea, citrulline, cetyl hydroxyproline palmitide, and N-acetyl-hydroxyproline, (D) a cationic polymer containing 40 mol% or more of a structural unit derived from dimethyldiallylammonium chloride, and a liquid skin cleansing composition containing the same, The mass ratio [{(A)+(B)} / (C)] of the total content of the components (A) and (B) to the content of the component (C) is 22 or more and 250 or less, A liquid skin cleansing composition characterized by being filled in a former container.

2. The content of the component (A) is 10% by mass or more and 25% by mass or less based on the total amount of the liquid skin cleansing composition, The content of the component (B) is 1% by mass or more and 6% by mass or less based on the total amount of the liquid skin cleansing composition, The content of the component (C) is 0.1% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition, The content of the component (D) is 0.1% by mass or more and 0.8% by mass or less based on the total amount of the liquid skin cleansing composition. The liquid skin cleansing composition according to Claim 1.

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