Liquid skin cleansing composition

Abstract

To provide a liquid skin cleansing composition that is superior in foam retention during washing, sense of moisture on post-wash skin, and low-temperature stability.SOLUTION: A liquid skin cleansing composition comprises: (A) one or more selected from polyoxyethylene alkyl ether sulfates and polyoxyethylene alkyl ether carboxylates; (B) a fatty acid having 10 to 20 carbon atoms or a salt thereof; (C) a cationic polymer; (D) a polyhydric alcohol; and (E) one or more selected from a neutral amino acid or a salt thereof, urea, and lactic acid or a salt thereof. The liquid skin cleansing 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] In recent years, liquid skin cleansing compositions such as body soaps have been required to have good foaming performance and good moisturizing performance after washing.

[0003] For example, for the purpose of obtaining good moisturizing performance after washing, a skin cleansing composition containing an anionic surfactant, a cationic polymer, and an oil agent in a specific ratio has been proposed (see, for example, Patent Document 1). However, in conventional skin cleansing compositions including Patent Document 1, there has been room for improvement in the texture of the foam discharged from the foamer container. In addition, when the blending ratio of fatty acids is increased to improve foam performance such as foam texture, the low-temperature stability may deteriorate, and there has also been a concern that the discharge property from the foamer container and the moisturizing performance after washing may decrease due to this.

[0004] Therefore, there is a demand for a liquid skin cleansing composition that is excellent in foam texture during washing, a moist feeling on the skin after washing, and low-temperature stability.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to solve the above-described conventional problems and achieve the following objects. That is, an object of the present invention is to provide a liquid skin cleansing composition that is excellent in foam texture during washing, a moist feeling on the skin after washing, and low-temperature stability.

Means for Solving the Problems

[0007] The liquid skin cleansing agent composition of the present invention contains (A) at least one selected from polyoxyethylene alkyl ether sulfates and polyoxyethylene alkyl ether carboxylates, (B) a fatty acid having 10 to 20 carbon atoms or a salt thereof, (C) a cationic polymer, (D) a polyhydric alcohol, and (E) at least one selected from neutral amino acids or salts thereof, urea, and lactic acid or salts thereof, and is filled in a foamer 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) at least one selected from polyoxyethylene alkyl ether sulfates and polyoxyethylene alkyl ether carboxylates, (B) a fatty acid having 10 to 20 carbon atoms or a salt thereof, (C) a cationic polymer, (D) a polyhydric alcohol, (E) at least one selected from neutral amino acids or salts thereof, urea, and lactic acid or salts thereof, and is a liquid skin cleansing agent composition characterized by being filled in a foamer container. <2> The liquid skin cleansing agent composition according to <1> above, wherein the mass ratio [(D) / (E)] of the content of component (D) to the content of component (E) is 16 or more and 100 or less. <3> The liquid skin cleansing agent composition according to <1> or <2> above, wherein the total content of component (D) and component (E) is 4.9% by mass or more and 15% by mass or less.

Advantages of the Invention

[0009] According to the present invention, it is possible to provide a liquid skin cleansing agent composition excellent in foam retention during washing, a moist feeling on the skin after washing, and low-temperature stability.

Mode for Carrying Out the Invention

[0010] (Liquid Skin Cleanser Composition) The liquid skin cleanser composition of the present invention contains (A) at least one selected from polyoxyethylene alkyl ether sulfates and polyoxyethylene alkyl ether carboxylates, (B) a fatty acid having 10 to 20 carbon atoms or a salt thereof, (C) a cationic polymer, (D) a polyhydric alcohol, and (E) at least one selected from neutral amino acids or salts thereof, urea, and lactic acid or salts thereof, and may contain other components as necessary. In the present specification, "at least one selected from polyoxyethylene alkyl ether sulfates and polyoxyethylene alkyl ether carboxylates (A)" may be referred to as "(A)" or "(component A)", and "(B) a fatty acid having 10 to 20 carbon atoms or a salt thereof" may be referred to as "(B)" or "(component B)", "(C) a cationic polymer" may be referred to as "(C)" or "(component C)", "(D) a polyhydric alcohol" may be referred to as "(D)" or "(component D)", "(E) at least one selected from neutral amino acids or salts thereof, urea, and lactic acid or salts thereof" may be referred to as "(E)" or "(component E)", and "former container" may sometimes be simply referred to as "container". In the present specification, "foam retention during washing" may sometimes be simply referred to as "foam retention", and "moist feeling on the skin after washing" may sometimes be simply referred to as "moist feeling".

[0011] <At least one selected from polyoxyethylene alkyl ether sulfates and polyoxyethylene alkyl ether carboxylates (A)> The component (A) imparts good foam retention to the liquid skin cleanser composition.

[0012] - Polyoxyethylene alkyl ether sulfate - The polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good foaming property, those having an average addition mole number of ethylene oxide (E.O.) of 1 to 6 and an alkyl chain length of 10 to 16 are preferable, and those having an average addition mole number of ethylene oxide (E.O.) of 1 to 6 and an alkyl chain length of 12 to 14 are more preferable.

[0013] Specific examples of the polyoxyethylene alkyl ether sulfate include polyoxyethylene (1 - 3) caprylether sulfate, polyoxyethylene (1 - 3) lauryl ether sulfate, polyoxyethylene (1 - 3) myristyl ether sulfate, polyoxyethylene (1 - 3) palmityl ether sulfate, polyoxyethylene (1 - 3) stearyl ether sulfate, etc. Among these, from the viewpoint of good foaming property, polyoxyethylene (1 - 3) lauryl ether sulfate is preferable. The numerical value within the parentheses represents the average addition mole number of ethylene oxide (E.O.). These may be used alone or in combination of two or more.

[0014] The counter ion of the polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected according to the purpose. For example, alkali metal ions, ammonium ions, alkanolamines, basic amino acids, etc. can be mentioned. The alkali metal ion is not particularly limited and can be appropriately selected according to the purpose. For example, sodium ion, potassium ion, etc. can be mentioned. The alkanolamine is not particularly limited and can be appropriately selected according to the purpose. For example, monoethanolamine, diethanolamine, triethanolamine, etc. can be mentioned. The basic amino acid is not particularly limited and can be appropriately selected according to the purpose. For example, lysine, arginine, etc. can be mentioned. Among these, alkali metal ions are preferable, and sodium ions are more preferable.

[0015] As for the polyoxyethylene alkyl ether sulfate, a synthesized product may be used as appropriate, or a commercially available product may be used. Examples of commercially available products of the polyoxyethylene alkyl ether sulfate include, for example, under the trade names, Emal 125HP (sodium polyoxyethylene (1) lauryl ether sulfate, manufactured by Kao Corporation), Shinorin SPE-1250 (sodium polyoxyethylene (2) lauryl ether sulfate, manufactured by Shin Nippon Rika Co., Ltd.), Emal 20C (sodium polyoxyethylene (3) lauryl ether sulfate, manufactured by Kao Corporation), Emal 20T (triethanolamine polyoxyethylene (3) alkyl ether sulfate, manufactured by Kao Corporation), Teikapoal NE1270 (ammonium polyoxyethylene (3) lauryl ether sulfate, manufactured by Teika Co., Ltd.), and the like.

[0016] - Polyoxyethylene alkyl ether carboxylate - The polyoxyethylene alkyl ether carboxylate is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good foaming property, those having an average addition mole number of ethylene oxide (E.O.) of 1 to 6 and an alkyl chain length of 10 to 16 are preferred, and those having an average addition mole number of ethylene oxide (E.O.) of 1 to 6 and an alkyl chain length of 12 to 14 are more preferred.

[0017] Specific examples of the polyoxyethylene alkyl ether carboxylate include polyoxyethylene (1 to 12) alkyl ether carboxylate, polyoxyethylene (1 to 12) hydroxy ether carboxylate, polyoxyethylene (1 to 12) alkylamide ether carboxylate, and the like. Among these, from the viewpoint of good foaming property, polyoxyethylene (1 to 3) lauryl ether carboxylate is preferred. The numerical values in the parentheses represent the average addition mole number of ethylene oxide (E.O.). These may be used alone or in combination of two or more.

[0018] The counter ion of the polyoxyethylene alkyl ether carboxylate is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include alkali metal ions, ammonium ions, alkanolamines, basic amino acids, and the like. The alkali metal ion is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include sodium ions, potassium ions, and the like. The alkanolamine is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include monoethanolamine, diethanolamine, triethanolamine, and the like. The basic amino acid is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include lysine, arginine, and the like. Among these, alkali metal ions are preferred, and sodium ions are more preferred.

[0019] As the polyoxyethylene alkyl ether carboxylate, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the polyoxyethylene alkyl ether carboxylate include, for example, by trade name, Kaoacipo RLM-45NV (sodium polyoxyethylene (4.5) lauryl ether acetate, manufactured by Kao Corporation), Enajicol EC-30 (sodium polyoxyethylene (3) lauryl ether acetate, manufactured by Lion Specialty Chemicals Co., Ltd.), Byolite LCA-H (polyoxyethylene (4) lauryl ether acetic acid, manufactured by Sanyo Chemical Industries, Ltd.), Kaoacipo RLM-100NV (sodium polyoxyethylene (10) lauryl ether acetate, manufactured by Kao Corporation), and the like.

[0020] The content of the component (A) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of good foaming property, moist feeling, and low-temperature stability, it is preferably 0.5% by mass or more and 20% by mass or less, more preferably 1% by mass or more and 10% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (A) is 0.5% by mass or more based on the total amount of the liquid skin cleansing composition, the foaming property becomes good. When the content of the component (A) is 20% by mass or less based on the total amount of the liquid skin cleansing composition, the moist feeling and the low-temperature stability become good.

[0021] <(B) Fatty acid having 10 to 20 carbon atoms or its salt> The component (B) imparts good foaming property and good moist feeling to the liquid skin cleansing composition.

[0022] The component (B) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good foaming property, moist feeling, and low-temperature stability, a fatty acid having 12 to 18 carbon atoms or its salt is preferable, and a fatty acid having 12 to 14 carbon atoms or its salt is more preferable. Specific examples of the fatty acid having 12 to 18 carbon atoms or its salt include lauric acid or its salt, myristic acid or its salt, palmitic acid or its salt, stearic acid or its salt, and the like. Specific examples of the fatty acid having 12 to 14 carbon atoms or its salt include lauric acid or its salt, myristic acid or its salt, and the like. These may be used alone or in combination of two or more.

[0023] As the fatty acid, those synthesized as appropriate may be used, or commercially available products 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. These fatty acids may be used for the preparation of fatty acid salts.

[0024] Although the fatty acid salt can be blended as a fatty acid salt, the fatty acid and the salt serving as a counter ion may be separately added to the blending tank and neutralized to form a fatty acid salt.

[0025] The counter ion of the salt in the component (B) is not particularly limited and can be appropriately selected according to the purpose. Examples include alkali metal ions, ammonium ions, alkanolamines, basic amino acids, and the like. The alkali metal ion is not particularly limited and can be appropriately selected according to the purpose. Examples include sodium ions, potassium ions, and the like. The alkanolamine is not particularly limited and can be appropriately selected according to the purpose. Examples include monoethanolamine, diethanolamine, triethanolamine, and the like. The basic amino acid is not particularly limited and can be appropriately selected according to the purpose. Examples include lysine, arginine, and the like. Among these, alkali metal ions are preferred, and sodium ions are more preferred.

[0026] As 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 salt include, by 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.), Non-Sal PK-1 (potassium palmitate, manufactured by NOF Corporation), Non-Sal SK-1 (potassium stearate, manufactured by NOF Corporation), Tysope MNK-40 (a liquid mixture of potassium coconut fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), and the like.

[0027] 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 foaming property, moist feeling, and low-temperature stability, it is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.5% by mass or more and 8% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (B) is 0.1% by mass or more based on the total amount of the liquid skin cleansing composition, the foaming property 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 moist feeling and the low-temperature stability are good.

[0028] <(C) Cationic polymer> The component (C) imparts good foaming property and good moist feeling to the liquid skin cleansing composition.

[0029] The component (C) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of good foaming property, moist feeling, and low-temperature stability, cationized polysaccharides and quaternized dialkylaminoalkyl (meth)acrylate polymers are preferred.

[0030] - Cationized polysaccharides - Examples of the cationized polysaccharides include cationized cellulose, cationized guar gum, cationized xanthan gum, cationized locust bean gum, etc. Among these, cationized cellulose is preferred from the viewpoints of good foaming property, moist feeling, and low-temperature stability.

[0031] Examples of the cationized cellulose include O-[2-hydroxy-3-(trimethylammonio)propyl] hydroxyethyl cellulose chloride, etc. The cationized cellulose may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available products of the cationized cellulose include, for example, under the trade names, Katinal HC-100, Katinal HC-200, Katinal LC-100, Katinal LC-200 (above, Toho Chemical Industry Co., Ltd.), DOCQUAT-10, DOCQUAT-10V (above, DOC JAPAN Co., Ltd.), and the like.

[0032] Examples of the cationized guar gum include, for example, O-[2-hydroxy-3-(trimethylammonio)propyl] guar gum chloride and the like. The cationized guar gum may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available products of the cationized guar gum include, for example, under the trade name, JAGUAR EXCEL (manufactured by Sankyo Co., Ltd.) and the like.

[0033] The cationized xanthan gum may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available products of the cationized xanthan gum include, for example, under the trade name, Labo Gum CX (manufactured by DSP Gokyo Foods & Chemicals Co., Ltd.) and the like.

[0034] Examples of the cationized locust bean gum include, for example, locust bean hydroxypropyltrimonium chloride and the like. The cationized locust bean gum may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available products of the cationized locust bean gum include, for example, under the trade name, Katinal CLB-100 (manufactured by Toho Chemical Industry Co., Ltd.) and the like.

[0035] - Quaternized dialkylaminoalkyl (meth)acrylate polymer - Examples of the quaternized dialkylaminoalkyl (meth)acrylate polymer include diethyl sulfate N,N-dimethylaminoethyl methacrylate·N,N-dimethylacrylamide· polyethylene glycol dimethacrylate copolymer (Polyquaternium-52), vinylpyrrolidone·N,N-dimethylaminoethyl methacrylate co-diethyl sulfate copolymer (Polyquaternium-11), and the like.

[0036] As the quaternized dialkylaminoalkyl (meth)acrylate polymer, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the quaternized dialkylaminoalkyl (meth)acrylate polymer include, for example, under the trade name, Sofcare KG-301W (Polyquaternium-52, manufactured by Kao Corporation), H.C. Polymer 1NS (Polyquaternium-11, manufactured by Osaka Organic Chemical Industry 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. From the viewpoints of good foaming, moist feeling, and low-temperature stability, it is preferably 0.1% by mass or more and 1% by mass or less, more preferably 0.2% by mass or more and 0.8% by mass or less, based on the total amount of the 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 foaming and the moist feeling are good. When the content of the component (C) is 1% by mass or less based on the total amount of the liquid skin cleansing composition, the low-temperature stability is good.

[0038] <(D) Polyhydric alcohol> The component (D) imparts good low-temperature stability to the liquid skin cleansing composition.

[0039] The component (D) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good low-temperature stability, propylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, and sorbitol are preferable, and propylene glycol and glycerin are more preferable.

[0040] As the component (D), those synthesized appropriately may be used, or commercially available products may be used. Examples of commercially available products of the component (D) include, for example, propylene glycol for cosmetics (propylene glycol, manufactured by ADEKA CORPORATION) under the trade name, dipropylene glycol FG (dipropylene glycol, manufactured by Iwase Kosfa Co., Ltd.), 1,3-butylene glycol (1,3-butylene glycol, manufactured by Iwase Kosfa Co., Ltd.), glycerin for cosmetics (85%) (glycerin, manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.), D-sorbitol solution (D-sorbitol 70%) (sorbitol, manufactured by Mitsubishi Corporation Life Sciences Ltd.), and the like.

[0041] The content of the component (D) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of good foaming and good low-temperature stability, 4.8% by mass or more and 14.8% by mass or less is preferable, and 5% by mass or more and 10% by mass or less is more preferable, based on the total amount of the liquid skin cleansing agent composition. When the content of the component (D) is 4.8% by mass or more based on the total amount of the liquid skin cleansing agent composition, the low-temperature stability becomes good. When the content of the component (D) is 14.8% by mass or less based on the total amount of the liquid skin cleansing agent composition, the foaming becomes good.

[0042] <One or more selected from (E) neutral amino acids or their salts, urea, and lactic acid or its salts> The component (E) imparts good foaming, good moist feeling, and good low-temperature stability to the liquid skin cleansing agent composition.

[0043] The (E) component is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of good foaming property, moist feeling, and low-temperature stability, pyrrolidone carboxylic acid or its salt, proline, urea, lactic acid or its salt is preferable, and pyrrolidone carboxylic acid or its salt is more preferable.

[0044] As the (E) component, those synthesized appropriately may be used, or commercially available products may be used. Examples of commercially available products of the (E) component include, by trade name, AJIDEW (registered trademark) A-100 (pyrrolidone carboxylic acid, manufactured by Ajinomoto Health Supply Co., Ltd.), AJIDEW NL-50 (sodium pyrrolidone carboxylate, manufactured by Ajinomoto Health Supply Co., Ltd.), AJIDEW ZN-100 (zinc L-pyrrolidone carboxylate, manufactured by Ajinomoto Health Supply Co., Ltd.), and the like.

[0045] The content of the (E) component is not particularly limited and can be appropriately selected according to the purpose. From the viewpoints of good foaming property, moist feeling, and low-temperature stability, 0.05% by mass or more and 0.5% by mass or less is preferable, and 0.1% by mass or more and 0.3% by mass or less is more preferable with respect to the total amount of the liquid skin cleansing agent composition. When the content of the (E) component is 0.05% by mass or more with respect to the total amount of the liquid skin cleansing agent composition, the foaming property, moist feeling, and low-temperature stability become good. When the content of the (E) component is 0.5% by mass or less with respect to the total amount of the liquid skin cleansing agent composition, the low-temperature stability becomes good.

[0046] <Total content [(D) + (E)]> In the liquid skin cleansing agent composition of the present invention, from the viewpoints of good foaming property and low-temperature stability, the total content [(D) + (E)] of the (D) component and the (E) component is preferably 4.9% by mass or more and 15% by mass or less, and more preferably 5% by mass or more and 10.2% by mass or less. When the total content [(D) + (E)] is 4.9% by mass or more, the low-temperature stability becomes good. When the total content [(D) + (E)] is 15% by mass or less, the foaming property becomes good.

[0047] <Mass ratio [(D) / (E)]> In the liquid skin cleansing composition of the present invention, from the viewpoint of good low-temperature stability, the mass ratio [(D) / (E)] of the content of the (D) component to the content of the (E) component is preferably 16 or more and 100 or less, and more preferably 16.6 or more and 80 or less. When the mass ratio [(D) / (E)] is 16 or more, the low-temperature stability becomes good. When the mass ratio [(D) / (E)] is 100 or less, the foaming property, moist feeling, and low-temperature stability become good.

[0048] <Other components> In the liquid skin cleansing composition of the present invention, in addition to the (A) component to the (E) component, other components can be blended as necessary within a range that does not impair the effects of the present invention. Examples of the other components include surfactants other than the (A) component and the (B) component, water-soluble polymers other than the (C) component, oils, silicones, alcohols other than the (D) component, lanolin derivatives, protein derivatives, amino acids other than the (E) component, drugs such as vitamins, bactericides, moisturizers, preservatives, pH adjusters such as potassium hydroxide, citric acid, and 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, appropriately synthesized ones 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.

[0049] The oil component is not particularly limited and can be appropriately selected according to the purpose. For example, vegetable oils and fats such as castor oil, olive oil, cacao butter, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grape seed oil, avocado oil, 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. can be mentioned. The content of the oil component is not particularly limited 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.

[0050] The alcohols other than the component (D) 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, hexadecanol, octyldodecanol, lauryl alcohol, etc. can be mentioned. The content of the alcohols is not particularly limited 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.

[0051] The humectant is not particularly limited and can be appropriately selected according to the purpose. For example, diethylene glycol monoalkyl ether, hydrogenated castor oil (30 E.O.), etc. can be mentioned.

[0052] 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, resorcinol, methylchloroisothiazolinone / methylisothiazolinone solution (trade name: Kathon CG, manufactured by Rohm and Haas Japan Co., Ltd.), salicylic acid, phenoxyethanol, ethanol, etc. can be mentioned. There are no particular restrictions on the content of the preservative, 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] 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. There are no particular restrictions on the content of the antioxidant, 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.

[0054] There are no particular restrictions on the chelating agent, and it can be appropriately selected according to the purpose. For example, disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. can be mentioned. There are no particular restrictions on the content of the chelating agent, 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.

[0055] There are no particular restrictions on the pH adjuster, and it 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.

[0056] 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 para-methoxysinnamate, titanium oxide, kaolin, talc, etc. can be mentioned.

[0057] 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. The content of the vitamins is not particularly limited 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.

[0058] 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, etc. can be used.

[0059] -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 4.0 or more and 8.0 or less, and more preferably 4.5 or more and 6.5 or less. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by Toa DK KK, electrode type GST-5721).

[0060] -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, it is preferably 4 mPa·s or more and 40 mPa·s or less, and more preferably 8 mPa·s or more and 30 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.).

[0061] -Former container- The liquid skin cleansing composition is filled in a former container, and a type that is ejected in a foamy state from the former container is preferable. The former container is not particularly limited as long as it can eject the liquid skin cleansing composition in a foamy state and can be appropriately selected according to the purpose. For example, a non-gas type foam ejection container, an aerosol container using a propellant and a pressure-resistant container, etc. can be mentioned. Among these, a non-gas type foam ejection container is preferable.

[0062] The non-gas type foam ejection container is not particularly limited as long as it can mix the liquid skin cleansing composition with air and eject it in a foamed state, and can be appropriately selected according to the purpose. For example, a squeeze former container that can eject foam by squeezing the bottle body by hand, a pump former container that can eject foam by pressing down the nozzle part, etc. can be mentioned. 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.

[0063] The non-gas type foam ejection 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.

[0064] 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 or more and 400 mesh or less is more preferred, and 200 mesh or more and 305 mesh or less 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 one pump former container capable of discharging foam by pressing down the nozzle part and one porous membrane body of 305 mesh and 200 mesh respectively, the viscosity of the liquid skin cleansing agent composition under the temperature conditions of use is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

[0065] - 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, and can be obtained by mixing the component (A) to the component (E), and if necessary, the other components, and purified water (formulated as the remaining amount so that the whole of the liquid skin cleansing agent composition is 100% by mass). Specifically, it can be manufactured as follows. After heating purified water and the component (D) to 70°C to 80°C in an amount of 95% by mass required for the finally obtained liquid skin cleansing agent composition, the component (A) and the component (B) are dissolved and cooled to 40°C or lower. Then, the component (C) and the component (E) are added. When the pH is less than the predetermined value, a pH adjuster, which is the other component, is added to adjust the pH to 6.0, and purified water is added so that the total amount becomes 100% by mass to obtain a liquid skin cleansing agent composition.

[0066] 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 shear 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.

[0067] -Use- The use 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. 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

[0068] Hereinafter, the present invention will be specifically described by giving examples and comparative examples, but the present invention is not limited to these examples at all. The contents of each component described in the examples and comparative examples are shown in "mass%", the total amount is 100 mass%, and all are values converted to pure components.

[0069] (Examples 1 to 30 and Comparative Examples 1 to 5) The liquid skin cleansing compositions having the compositions and contents shown in Examples 1 to 30 and Comparative Examples 1 to 5 were prepared according to the following method. Specifically, an amount of purified water and component (D) corresponding to 95% by mass of the amount required for the finally obtained liquid skin cleansing composition was heated to 70°C to 80°C, and then component (A) and component (B) were dissolved and cooled to 40°C or lower. Thereafter, component (C) and component (E) were added. When the predetermined pH was not reached, sodium hydroxide, which is another component, was added to adjust the pH to 6.0, and purified water was added so that the total amount became 100% by mass to obtain each liquid skin cleansing composition. Also, for the mixing of each component, 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). Also, each of the obtained liquid skin cleansing agent compositions was filled into a container with a foamer pump dispenser [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.].

[0070] For each liquid skin cleansing agent composition, the "low-temperature stability", "foam retention during washing", and "moist feeling on the skin after washing" were evaluated and judged as follows. The results are shown in Tables 1 to 6 below.

[0071] <Evaluation of low-temperature stability> Approximately 50 g of each liquid skin cleansing agent composition was placed in a cylindrical transparent glass bottle (diameter 4 cm, height 7.5 cm) and stored in a constant temperature bath at -5°C for 2 weeks. After storage, the liquid skin cleansing agent composition was visually observed, and the formation state of precipitates was judged based on the following judgment criteria. - Judgment criteria - ◎: No crystallization or solid precipitation 〇: Almost no crystallization or solid precipitation △: Crystals or solids are precipitating ×: A large amount of crystals or solids are precipitating

[0072] <Evaluation of foam retention during washing> Ten professional evaluators each took 3 pushes (about 9 g) of each liquid skin cleansing agent composition in their hands and evaluated the "foam retention" when washing the whole body 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: Very good foam retention 3 points: Good foam retention 2 points: Slightly good foam retention 1 point: Poor foam retention - Judgment criteria - ◎: 3.5 points or more ○: 3.0 or more and less than 3.5 points △: 2.0 or more and less than 3.0 points ×: less than 2.0 points

[0073] <Evaluation of the Moisture Feeling of Skin after Washing> Ten professional evaluators each took 3 pushes (about 9 g) of each liquid skin cleansing agent composition in their hands, washed their whole bodies, and then rinsed with warm water at 40 °C. After towel-drying, the "moisture feeling" 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 criteria for the average score. - Evaluation Criteria - 4 points: Very moist 3 points: Moist 2 points: Slightly moist 1 point: Not moist - Judgment Criteria - ◎: 3.5 points or more ○: 3.0 or more and less than 3.5 points △: 2.0 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]

Table 6

[0080] Details of each component used in Examples 1 to 30 and Comparative Examples 1 to 5 are shown in Table 7 below.

[0081]

Table 7

Industrial Applicability

[0082] Since the liquid skin cleansing agent composition is excellent in foam retention during washing, moist feeling on the skin after washing, and low-temperature stability, 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) one or more selected from polyoxyethylene alkyl ether sulfates and polyoxyethylene alkyl ether carboxylates, (B) a fatty acid having 10 to 20 carbon atoms or a salt thereof, (C) a cationic polymer, (D) a polyhydric alcohol, (E) one or more selected from neutral amino acids or salts thereof, urea, and lactic acid or salts thereof, and A liquid skin cleansing composition characterized by being filled in a former container.

2. The liquid skin cleansing composition according to claim 1, wherein the mass ratio [(D) / (E)] of the content of component (D) to the content of component (E) is 16 or more and 100 or less.

3. The liquid skin cleansing composition according to claim 1 or 2, wherein the total content of component (D) and component (E) is 4.9% by mass or more and 15% by mass or less.

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