Liquid skin cleansing composition

Abstract

To provide a liquid skin cleansing composition which is superior in foam richness as well as skin smoothness during rinsing, and also effectively retains skin moisture after washing even in a low-humidity environment.SOLUTION: A liquid skin cleansing composition comprises: (A) a fatty acid salt; (B-1) at least one cationic polymer selected from the group consisting of dimethyldiallylammonium chloride polymer and a copolymer of dimethyldiallylammonium chloride and acrylic acid; (B-2) a cationized polysaccharide; and (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.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, the demand and interest in the moisturizing power to sustain the feeling of moisture have been increasing.

[0003] As a conventional technique, for example, for the purpose of providing a skin cleansing composition having good foaming and foam quality and excellent moisturizing effect, a skin cleansing composition containing a higher fatty acid having 14 or more carbon atoms, a dimethyldiallylammonium chloride-acrylamide copolymer, and polyethylene glycol has been proposed (see Patent Document 1). However, in the conventional skin cleansing compositions including Patent Document 1, the moisturizing effect by body soap, which is a rinse-off preparation, is limited, and the skin improvement effects such as the effect of suppressing skin dryness like body cream are not sufficiently satisfactory. Further, since the conventional skin cleansing compositions including Patent Document 1 are rinse-off preparations, it has been very difficult to penetrate components having higher hydrophilicity than hydrophobic moisturizing components such as vitamin A into the skin.

[0004] Therefore, it is desired to provide a liquid skin cleansing composition excellent in foam density, smoothness of the skin during rinsing, and moisturizing persistence on the skin after washing.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention aims to solve the above-mentioned problems and achieve the following objectives. That is, the present invention aims to provide a liquid skin cleansing composition that is excellent in foam density and skin smoothness during rinsing, and also excellent in moisturizing persistence on the skin after washing even in a low-humidity environment.

Means for Solving the Problems

[0007] The liquid skin cleansing composition of the present invention contains (A) a fatty acid salt, (B-1) one or more cationic polymers selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers, (B-2) a cationized polysaccharide, and (C) one or more selected from pyrrolidonecarboxylic acid or its salt, pyrrolidonecarboxylic acid alkyl ester, urea, citrulline, cetyl hydroxyproline palmitate, and N-acetyl-hydroxyproline.

[0008] The present invention is based on the findings of the present inventors, and the means for solving the above problems are as follows. That is, <1> (A) a fatty acid salt, (B-1) one or more cationic polymers selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers, (B-2) a cationized polysaccharide, (C) one or more selected from pyrrolidonecarboxylic acid or its salt, pyrrolidonecarboxylic acid alkyl ester, urea, citrulline, cetyl hydroxyproline palmitate, and N-acetyl-hydroxyproline, and is a liquid skin cleansing composition characterized by containing the same. <2> The liquid skin cleansing composition according to <1> above, wherein the mass ratio [(B-1) / (B-2)] of the content of the component (B-1) to the content of the component (B-2) is 4.2 or more and 40 or less. <3> The content of the component (A) is 10% by mass or more and 23% by mass or less based on the total amount of the liquid skin cleansing composition, the content of the component (B-1) 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 content of the component (B-2) is 0.01% by mass or more and 0.2% by mass or less based on the total amount of the liquid skin cleansing composition, The liquid skin cleansing composition according to <1> or <2> above, wherein the content of the component (C) is 0.1% by mass or more and 5% by mass or less based on the total amount of the liquid skin cleansing composition.

Advantages of the Invention

[0009] According to the present invention, it is possible to provide a liquid skin cleansing composition that is excellent in the density of foam and the smoothness of the skin during rinsing, and also excellent in the moisturizing persistence on the skin after washing even in a low humidity environment.

Embodiments for Carrying Out the Invention

[0010] (Liquid Skin Cleansing Composition) The liquid skin cleansing composition of the present invention contains (A) a fatty acid salt, (B-1) one or more cationic polymers selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, (B-2) a cationized polysaccharide, and (C) one or more selected from pyrrolidonecarboxylic acid or its salt, an alkyl ester of pyrrolidonecarboxylic acid, urea, citrulline, cetyl hydroxyproline palmitate, and N-acetyl-hydroxyproline, and may contain other components as necessary. In this specification, "(A) fatty acid salt" may be referred to as "(A)" or "(A) component", "(B-1) one or more cationic polymers selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers" may be referred to as "(B-1)" or "(B-1) component", "(B-2) cationized polysaccharide" may be referred to as "(B-2)" or "(B-2) component", and "(C) one or more selected from pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, urea, citrulline, cetyl hydroxyproline palmitate, and N-acetyl-hydroxyproline" may be referred to as "(C)" or "(C) component".

[0011] In the liquid skin cleansing composition of the present invention, by combining the aggregate of the (A) component and the hydrophobic (B-1) component with the (B-2) component, the aggregate is hydrophilically changed, and by further combining the (C) component (moisturizing functional component) that can be oriented in the vicinity of the fatty acid micelle, the hydrophilic moisturizing functional component can be retained and penetrated into the skin for a long time. Therefore, it is possible to realize a liquid skin cleansing composition that is excellent in the density of foam and the smoothness of the skin during rinsing, and is also excellent in the moisturizing persistence of the skin after washing even in a low-humidity environment.

[0012] <(A) fatty acid salt> The (A) fatty acid salt imparts good foam density and smoothness of the skin during rinsing to the liquid skin cleansing composition.

[0013] The component (A) is not particularly limited and can be appropriately selected according to the purpose. Examples include laurate, myristate, palmitate, stearate, etc. Among these, from the viewpoint of excellent foam density, smoothness of the skin during rinsing, and skin moisturizing persistence in a low humidity environment (hereinafter sometimes simply referred to as "moisturizing persistence"), it is preferably included one or more selected from saturated fatty acid salts having 12 or more and 22 or less carbon atoms, and more preferably included one or more selected from saturated fatty acid salts having 12 or more and 18 or less carbon atoms. These may be used alone or in combination of two or more.

[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, etc. The alkali metal salt is not particularly limited and can be appropriately selected according to the purpose. Examples include sodium salts, potassium salts, etc. 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, etc. The amino acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples include lysine salts, arginine salts, etc. 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, but the fatty acid and the salt serving as the counter ion may be separately added to the blending tank and neutralized to form a fatty acid salt.

[0016] The fatty acid used for preparing the fatty acid salt may be appropriately synthesized or a commercially available product may be used. Examples of commercially available products of the fatty acid include, for example, under the 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 appropriately synthesized 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 (liquid mixture of potassium coconut fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), and the like.

[0018] The content of the component (A) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of good foam density and smoothness of the skin during rinsing, it is preferably 5% by mass or more and 25% by mass or less, more preferably 10% by mass or more and 23% 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 density is 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 smoothness of the skin during rinsing is good.

[0019] <One or more cationic polymers selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers> The component (B-1) imparts good long-lasting moisturizing property to the liquid skin cleansing composition.

[0020] The component (B-1) is a polymer compound having a structure represented by the following general formula (B1).

[0021] [Chemical formula] (In the general formula (B1), n and m represent the molar ratios (mol%) of the respective structural units, and n + m = 100.)

[0022] As the molar ratio of the structural unit derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer, from the viewpoint of achieving good long-lasting moisturizing property, 65 mol% or more is preferable, and 95 mol% or more is more preferable. The component (B-1) may be used alone or in combination of two or more.

[0023] 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.)

[0024] The weight average molecular weight of the component (B-1) is not particularly limited and can be appropriately selected according to the purpose, but 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 (B-1) 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).

[0025] In the solution of the solid content of 30% by mass to 44% by mass of the component (B-1), the viscosity at 25°C is preferably 10 mPa·s or more and 15,000 mPa·s or less, 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).

[0026] As the component (B-1), those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the component (B-1) include the following by trade name.

[0027] Merquat 100 (component name: dimethyldiallylammonium chloride polymer, manufactured by Nippon Lubrizol Corporation, viscosity at 25°C with a solid content of 39% by mass to 44% by mass: 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.

[0028] Merquat 106 (component name: dimethyldiallylammonium chloride polymer, manufactured by Nippon Lubrizol Corporation, viscosity at 25°C with a solid content of 30% by mass to 36% by mass: 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.

[0029] Markote 280 (Component name: Dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Nippon Lubrizol Corporation, 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 using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C using a No. 4 spindle rotor under the condition of 60 revolutions per minute.

[0030] Markote 295 (Component name: Dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Nippon Lubrizol Corporation, 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 using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C using a No. 4 spindle rotor under the condition of 30 revolutions per minute.

[0031] The content of the component (B-1) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of excellent moisturizing sustainability, 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 (B-1) is 0.1% by mass or more based on the total amount of the liquid skin cleansing composition, the moisturizing sustainability is good. When the content of the component (B-1) is 1% by mass or less based on the total amount of the liquid skin cleansing composition, the moisturizing sustainability is good.

[0032] <(B-2) Cationized polysaccharide> The component (B-2) imparts smoothness of the skin during rinsing and persistent moisturization to the liquid skin cleansing composition.

[0033] The component (B-2) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of achieving good smoothness of the skin during rinsing and persistent moisturization, cationized cellulose, cationized guar gum, cationized xanthan gum, and cationized locust bean gum are preferred, and cationized cellulose is more preferred. These may be used alone or in combination of two or more.

[0034] Examples of the cationized cellulose include O-[2-hydroxy-3-(trimethylammonio)propyl] hydroxyethyl cellulose chloride. Examples of commercially available products of the cationized cellulose include, by trade name, Cationar HC-100, Cationar HC-200, Cationar LC-100, Cationar LC-200 (all from Toho Chemical Industry Co., Ltd.), DOCQUAT-10, DOCQUAT-10V (both from DOC JAPAN Co., Ltd.).

[0035] Examples of the cationized guar gum include O-[2-hydroxy-3-(trimethylammonio)propyl] guar gum chloride. Examples of commercially available products of the cationized guar gum include, by trade name, Laboal Gum CG-M (manufactured by DSP Gokyo Hood & Chemical Co., Ltd.), JAGUAR EXCEL (manufactured by Sankyo Co., Ltd.).

[0036] Examples of commercially available products of the cationized xanthan gum include, by trade name, Laboal Gum CX (manufactured by DSP Gokyo Hood & Chemical Co., Ltd.).

[0037] Examples of the cationized locust bean gum include locust bean hydroxypropyltrimonium chloride. Examples of commercially available products of the cationized locust bean gum include, for example, Catinar CLB-100 (manufactured by Toho Chemical Industry Co., Ltd.) under the trade name.

[0038] The average molecular weight (MW) of the component (B-2) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of smoothness during rinsing and good moisturizing persistence, it is preferably 300,000 or more and 1,300,000 or less. The average molecular weight of the component (B-2) can be measured, for example, by the static light scattering method. Specifically, the concentration-specific refractive index curve is measured using a differential refractive index meter for a diluted polymer aqueous solution, and the concentration-angle dependence of the scattering intensity is measured using a scattering intensity measuring device, and the weight average molecular weight can be measured by extrapolating to a concentration of 0 and an angle of 0 in the Zimm plot.

[0039] The cation charge amount (meq / g) of the component (B-2) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of smoothness during rinsing, good moisturizing persistence, and good drainage property, it is preferably 0.7 meq / g or more and 1.5 meq / g or less. The cation charge amount of the component (B-2) can be obtained, for example, by determining the amount of nitrogen per unit amount by the Kjeldahl method and dividing it by the atomic weight of nitrogen as shown in the following formula. (Formula)... Cation charge amount (meq / g) = {X / (100 × 14)} × 1000 In the formula, X represents the nitrogen content (%) obtained by the Kjeldahl method.

[0040] The content of the component (B-2) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of smoothness of the skin during rinsing, good moisturizing persistence, and good drainage property from the container, it is preferably 0.005% by mass or more and 0.2% by mass or less, more preferably 0.01% by mass or more and 0.2% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (B-2) is 0.005% by mass or more based on the total amount of the liquid skin cleansing composition, the smoothness of the skin during rinsing and the long-lasting moisturizing property become good. When the content of the component (B-2) is 0.2% by mass or less based on the total amount of the liquid skin cleansing composition, the long-lasting moisturizing property and the discharge property from the container become good.

[0041] <One or more selected from (C) pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, urea, citrulline, cetyl hydroxyproline palmitide, and N-acetyl-hydroxyproline> The component (C) imparts good long-lasting moisturizing property to the liquid skin cleansing composition. The good long-lasting moisturizing property is derived from the component (C) having an IOB value of 0.4 to 11. Here, the IOB value (Inorganic Organic Balance (inorganicity / organicity ratio)) is a value representing the ratio of the inorganic value to the organic value, and is an index indicating the degree of polarity of an organic compound. "Inorganic values" and "organic values" corresponding to various atoms or functional groups are set, and the IOB value can be calculated by integrating the "inorganic values" and "organic values" of all atoms and functional groups in the organic compound.

[0042] As the component (C), from the viewpoint of good long-lasting moisturizing property, pyrrolidonecarboxylic acid or its salt, urea, and N-acetyl-hydroxyproline having an IOB value of 3.0 to 11 are preferable.

[0043] As the component (C), those synthesized as appropriate may be used, or commercially available products 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.

[0044] The content of the component (C) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of good moisture retention persistence and good dischargeability from the container, it is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 5% 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 moisture retention persistence is good. When the content of the component (C) is 10% by mass or less based on the total amount of the liquid skin cleansing composition, the dischargeability from the container is good.

[0045] <Mass ratio [(B-1) / (B-2)]> In the liquid skin cleansing composition of the present invention, from the viewpoints of good smoothness of the skin during rinsing and good moisture retention persistence, the mass ratio [(B-1) / (B-2)] of the content of the component (B-1) to the content of the component (B-2) is preferably 4.2 or more and 40 or less, more preferably 4.2 or more and 30 or less. When the mass ratio [(B-1) / (B-2)] is 4.2 or more, the moisture retention persistence is good. When the mass ratio [(B-1) / (B-2)] is 40 or less, the smoothness of the skin during rinsing and the moisturizing persistence become good.

[0046] <Other components> In the liquid skin cleanser composition, in addition to the components of the component (A), the component (B-1), the component (B-2), and the component (C), other components can be blended as needed within a range that does not impair the effects of the present invention. Examples of the other components include surfactants other than the component (A), water-soluble polymers other than the component (B-1), 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 scatterers, animal and plant extracts or their derivatives, chelating agents such as edetic acid, dyes, fragrances, pigments, inorganic powders, clay minerals, 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 appropriately may be used, or commercially available products may be used. The content of the other components in the liquid skin cleanser composition is not particularly limited and can be appropriately selected according to the purpose.

[0047] 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, cocoa butter, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grape seed oil, avocado oil, and their ester compounds; animal oils and fats such as mink oil, egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, behenic acid; esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, cholesterol oleate, etc. can 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.

[0048] 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. can 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.

[0049] The humectant is not particularly limited and 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.

[0050] The preservative is not particularly limited and can be appropriately selected according to the purpose. For example, benzoate, sorbate, dehydroacetate, paraoxybenzoate, 2,4,4′ - trichloro - 2′ - hydroxydiphenyl ether, 3,4,4′ - trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, 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. The content of the preservative 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, with respect to the total amount of the liquid skin cleansing composition, 0.1% by mass or more and 1% by mass or less is preferable.

[0051] The antioxidant is not particularly limited and 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. The content of the antioxidant 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, with respect to the total amount of the liquid skin cleansing composition, 0.1% by mass or more and 1% by mass or less is preferable.

[0052] 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 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 composition.

[0053] 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.

[0054] 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.

[0055] 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. The content of the vitamins is not particularly limited 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.

[0056] 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. The content of the amino acids 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 0.001% by mass or more and 0.5% by mass or less based on the total amount of the liquid skin cleansing composition.

[0057] The fragrance is not particularly limited and 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.

[0058] -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, 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 DK KK).

[0059] -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, 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, 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.) can be mentioned.

[0060] - Foamer container - The liquid skin cleansing agent composition is filled in a foamer container, and a type that is discharged in a foamy state from the foamer container is preferred. In this specification, the "foamer container" may sometimes be simply referred to as a "container". The foamer container is not particularly limited and can be appropriately selected from known foamer containers. For example, a non-gas type foam discharge container, an aerosol container using a propellant and a pressure-resistant container, etc. can be mentioned. Among these, a non-gas type foam discharge container is preferred.

[0061] The non-gas type foam discharge container is not particularly limited as long as it can mix the liquid skin cleansing agent composition with air and discharge it in a foamed state, and can be appropriately selected according to the purpose. For example, a squeeze foamer container that can discharge foam by squeezing the bottle body by hand, a pump foamer container that can discharge foam by pressing down the nozzle part, etc. can be mentioned. Such foamer containers can use, for example, those manufactured by Daiwa Can Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, as the foamer container, foamer containers described in JP-A-7-315463, JP-A-8-230961, JP-A-2005-193972, etc. can be used.

[0062] 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 agent composition passes through the porous membrane body. The material of the porous membrane body is not particularly limited and can be appropriately selected according to the purpose, but plastic materials such as nylon, polyester, and polyolefin are preferred.

[0063] The mesh of the porous membrane body is not particularly limited and can be appropriately selected according to the purpose. However, 100 mesh or more is preferable, 100 mesh to 400 mesh is more preferable, and 200 mesh to 305 mesh is even more preferable. Also, the number of the porous membrane bodies is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoint of improving the foaming performance, 2 to 4 sheets are preferable. 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 the room temperature condition of 25°C is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

[0064] -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 components (A), (B-1), (B-2), and (C), and, if necessary, the other components and purified water (formulated as the remaining amount so that the total 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) and the component (C) in purified water heated to 70°C to 80°C, cooling it to 40°C or lower, and then adding the component (B-1), the component (B-2), and the other components, it can be manufactured.

[0065] The liquid skin cleansing agent 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 apparatus equipped with stirring blades having a shearing force and capable of mixing the whole can be mentioned. The stirring blades are not particularly limited and can be appropriately selected according to the purpose. For example, propellers, turbines, dispersers, etc. can be mentioned.

[0066] - 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 the usual method of use. The use of the liquid skin cleansing composition is 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

[0067] 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 at all. 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.

[0068] (Examples 1 to 24 and Comparative Examples 1 to 10) The liquid skin cleansing compositions having the compositions and contents shown in Examples 1 to 24 and Comparative Examples 1 to 10 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 components (A) and (C) were dissolved, and then cooled to 40°C or lower, and then the components (B-1) and (B-2) and other components as necessary were added. When the predetermined pH was not satisfied, a pH adjuster, 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. Also, a propeller was used as the stirring blade, and stirring was performed 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 cleanser compositions of Examples 1 to 24 and Comparative Examples 1 to 10 were filled into containers equipped with a foamer pump dispenser [discharge amount 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.].

[0069] For each liquid skin cleanser composition, "foam density", "smoothness of the skin during rinsing", "moisturizing persistence in a low-humidity environment", and "drainability" were evaluated and judged as follows. The results are shown in Tables 1 to 5 below.

[0070] <Evaluation of foam density> Ten professional evaluators each took 5 pushes (about 15 g) of each liquid skin cleanser composition by hand and washed their whole bodies. After washing, the foam was taken in hand, and the foam density (the feel of the foam and the difficulty of 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 drips slightly 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

[0071] <Evaluation of the smoothness of the skin during rinsing> Ten professional evaluators wet the inner part of the forearm with warm water at 40 °C, took 1 push (about 3 g) of each liquid skin cleanser composition by hand, rubbed it, and then rinsed it with warm water at 40 °C. The tight and squeaky feeling after rinsing was regarded as the "smoothness of the skin during rinsing" and evaluated according to 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: There is no squeaky feeling at all. 3 points: There is a slight squeaky feeling. 2 points: There is a creaking feeling 1 point: There is a very strong creaking 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

[0072] <Evaluation of moisture retention persistence in a low - humidity environment> Ten professional evaluators each picked up about 15 g (5 pushes) of each liquid skin cleanser composition and washed their whole body by hand without using cleaning tools such as towels (humidity: 30%, temperature: 22°C), and then towel - dried. After 9 hours, the "skin flakiness" caused by skin dryness was evaluated 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 judgment criteria for the average score. - Evaluation criteria - 4 points: There is no flakiness at all 3 points: There is a slight flakiness 2 points: There is flakiness 1 point: There is a very strong flakiness - 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

[0073] <Evaluation of dischargeability from the container> Ten professional evaluators evaluated the ease of pumping the pump 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 judgment criteria for the average score. - Evaluation criteria - 4 points: The pump is easy to press and fine - grained foam is discharged 3 points: The pump is easy to press, but there are slightly mixed large - particle bubbles 2 points: The pump is slightly difficult to press and there are many mixed large - particle bubbles 1. Point: The pump is very difficult to press, 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

[0074]

Table 1

[0075]

Table 2

[0076]

Table 3

[0077]

Table 4

[0078]

Table 5

[0079] Details of each component used in Examples 1 to 24 and Comparative Examples 1 to 10 are shown in Table 6 below.

[0080]

Table 6

Industrial Applicability

[0081] The liquid skin cleansing composition is excellent in the density of foam and the smoothness of the skin during rinsing, and also excellent in the moisturizing persistence on the skin after washing even in a low-humidity environment. Therefore, it can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, etc., and can be particularly preferably used in body soaps.

Claims

1. (A) a fatty acid salt, (B-1) one or more cationic polymers selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers, (B-2) a cationized polysaccharide, (C) one or more selected from pyrrolidonecarboxylic acid or its salt, alkyl pyrrolidonecarboxylate, urea, citrulline, cetyl hydroxyproline palmitide, and N-acetyl-hydroxyproline, A liquid skin cleansing composition characterized by containing the above components.

2. The liquid skin cleansing composition according to Claim 1, wherein the mass ratio [(B-1) / (B-2)] of the content of the component (B-1) to the content of the component (B-2) is 4.2 or more and 40 or less.

3. The content of the component (A) is 10% by mass or more and 23% by mass or less based on the total amount of the liquid skin cleansing composition, The content of the component (B-1) 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 content of the component (B-2) is 0.01% by mass or more and 0.2% by mass or less based on the total amount of the liquid skin cleansing composition, The liquid skin cleansing composition according to Claim 1 or 2, wherein the content of the component (C) is 0.1% by mass or more and 5% by mass or less based on the total amount of the liquid skin cleansing composition.

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