Liquid skin cleanser composition

Abstract

To provide a liquid skin cleanser composition that offers superior foaming performance (foam generation and foam rinsing efficiency), while superior low-temperature stability and resistance to yellowing.SOLUTION: A liquid skin cleanser composition contains (A) an anionic surfactant, (B) an amino alcohol, (C) any salt selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate, and (D) any one selected from mannitol, xylitol, erythritol, lactitol, and palatinit. The mass ratio of the content of (B) to the sum of the content of (C) and content of (D), [(B) / {(C)+(D)}], is 0.3 or more and 2 or less.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] Conventionally, skin cleansing compositions have been required to have good foaming performance, such as foam breaking off during rinsing and foaming ability, as well as excellent long-term storage stability.

[0003] For example, for the purpose of providing a liquid skin cleanser composition that improves the skin condition after towel drying and has excellent foaming performance (speed of foaming and density of foam), a liquid skin cleanser composition containing an anionic surfactant, a cationic polymer, and a potassium phosphate salt has been proposed (see, for example, Patent Document 1). However, conventional skin cleansing compositions including that of Patent Document 1 contain fatty acid salts (anionic surfactants) as cleaning base materials, which tend to deteriorate low-temperature stability, and there are concerns that this may cause clogging of the mesh during discharge from the foamer container, resulting in poor foam dischargeability. In addition, monoethanolamine is added to improve the deterioration of low-temperature stability, but there are concerns that the oxidation of the monoethanolamine may cause the liquid color to turn yellow over time, resulting in poor storage stability.

[0004] Therefore, there is a demand for a liquid skin cleansing composition that has excellent foaming performance (good foaming and foam-removal during rinsing), as well as excellent low-temperature stability and yellowing suppression effect. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-006355 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention aims to solve the above-mentioned problems in the prior art and to achieve the following object: That is, the present invention aims to provide a liquid skin cleansing composition that has excellent foam performance (e.g., foaming ability and foam rinse-off during rinsing), and also has excellent low-temperature stability and yellowing suppression effect. [Means for solving the problem]

[0007] The present invention contains (A) an anionic surfactant, (B) an amino alcohol, (C) a salt selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate, and (D) any one selected from mannitol, xylitol, erythritol, lactitol, and palatinit, and the mass ratio [(B) / {(C)+(D)}] of the content of (B) to the sum of the content of (C) and the content of (D) is 0.3 or more and 2 or less.

[0008] The present invention is based on the findings of the present inventors, and the means for solving the above problems are as follows. <1> (A) an anionic surfactant; (B) an amino alcohol; (C) any salt selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate; (D) any one selected from mannitol, xylitol, erythritol, lactitol, and palatinite; The liquid skin cleansing composition is characterized in that the mass ratio of the content of (B) to the sum of the content of (C) and the content of (D), [(B) / {(C)+(D)}], is 0.3 or more and 2 or less. <2> the mass ratio of the content of (C) to the content of (D) [(C) / (D)] is 0.2 or more and 1 or less; <1> The liquid skin cleansing composition according to claim 1, <3> The liquid skin cleansing composition is for use in a foam container. <1> or the above <2> The liquid skin cleansing composition according to claim 1, Effect of the Invention

[0009] According to the present invention, it is possible to provide a liquid skin cleansing composition which has excellent foaming performance (good foaming and foam-removal during rinsing), and which has excellent low-temperature stability and yellowing-inhibiting effect. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Liquid skin cleansing composition) The liquid skin cleansing composition of the present invention contains (A) an anionic surfactant, (B) an aminoalcohol, (C) any salt selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate, and (D) any salt selected from mannitol, xylitol, erythritol, lactitol, and palatinit, and may contain other ingredients as necessary. In this specification, "(A) anionic surfactant" may be referred to as "(A)" or "(A) component", "(B) aminoalcohol" may be referred to as "(B)" or "(B) component", "(C) any salt selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate" may be referred to as "(C)" or "(C) component", and "(D) any one selected from mannitol, xylitol, erythritol, lactitol, and palatinit" may be referred to as "(D)" or "(D) component". In addition, "any" in the components (C) and (D) can be rephrased as "one or more".

[0011] <(A) Anionic surfactant> The anionic surfactant as the component (A) is contained in order to improve foam removal during rinsing.

[0012] The component (A) is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoints of foam removal during rinsing, foaming when discharged from a foamer container, and excellent low-temperature stability, a higher fatty acid salt, an ether carboxylic acid or a salt thereof is preferred, and a higher fatty acid salt is more preferred. These may be used alone or in combination of two or more.

[0013] -Higher fatty acid salts- The higher fatty acid salt is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include laurates, myristates, palmitates, stearates, etc. Among these, laurates, myristates, and palmitates are preferred from the viewpoints of foam removal during rinsing, foaming when discharged from a foamer container, and excellent low-temperature stability.

[0014] The counter ion in the higher fatty acid salt of the component (A) is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include alkali metal ions, ammonium ions, alkanolamines, and basic amino acids. Examples of the alkali metal ion include sodium ion and potassium ion. Examples of the alkanolamine include monoethanolamine, diethanolamine, and triethanolamine. Examples of the basic amino acid include lysine and arginine.

[0015] The higher fatty acid salt can be blended as a higher fatty acid salt, but a higher fatty acid and a salt serving as a counter ion may be added separately to a blending tank and subjected to a neutralization reaction to form a higher fatty acid salt.

[0016] The higher fatty acid used in the preparation of the higher fatty acid salt may be appropriately synthesized or may be a commercially available product. Examples of the commercially available higher fatty acid include 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), and NAA (registered trademark)-180 (stearic acid, manufactured by NOF Corporation).

[0017] The higher fatty acid salt may be appropriately synthesized or may be a commercially available product. Examples of commercially available higher fatty acid salts 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.), and Tysoap MNK-40 (liquid containing potassium coconut oil fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.).

[0018] -Ether carboxylic acid or its salt- The ether carboxylic acid or a salt thereof is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A2) or (A3): The ether carboxylic acid or a salt thereof may be used alone or in combination of two or more kinds.

[0019] [ka]

[0020] In the general formulas (A2) and (A3), R 2 represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. 2 The moiety preferably has 10 to 14 carbon atoms. In the general formula (A2), R 3may be the same or different and represent an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms. In the general formula (A2), o represents the average number of moles of alkylene oxide added, which is 1 to 20. The average number of moles of alkylene oxide added is preferably 1 to 5. In the general formulae (A2) and (A3), M 1 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

[0021] Among these, polyoxyalkylene alkyl ether carboxylic acid or a salt thereof is preferred from the viewpoints of foam removal during rinsing, foaming when discharged from a foamer container, and low-temperature stability. As the polyoxyalkylene alkyl ether carboxylic acid or a salt thereof, polyoxyethylene (POE) alkyl ether acetate is preferred.

[0022] Specific examples of the ether carboxylate represented by the general formula (A2) or (A3) include polyoxyethylene (3) sodium lauryl ether acetate, polyoxyethylene (4) potassium lauryl ether acetate, polyoxyethylene (4.5) sodium lauryl ether acetate, and sodium lauryl glycol acetate. The numerical value in the parentheses indicates the average number of moles (o) of alkylene oxide added.

[0023] The ether carboxylate may be appropriately synthesized or a commercially available product. Examples of commercially available ether carboxylates include, by trade name, Energyl EC-30 (manufactured by Lion Specialty Chemicals Co., Ltd., polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-H (polyoxyethylene (4) lauryl ether acetic acid), Viewlite LCA-25NH (laureth-4 carboxylic acid), Viewlite SHAA (sodium lauryl glycol carboxylate), Viewlite LCA (polyoxyethylene (3) lauryl ether sodium acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), Kao Akipo RLM-45NV (polyoxyethylene (4.5) lauryl ether sodium acetate), and Kao Akipo RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (all manufactured by Kao Corporation). The numerical value in the parentheses indicates the average number of moles (o) of alkylene oxide added.

[0024] The content of (A) is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoints of foam-breaking during rinsing, foaming when discharged from a foamer container, and excellent low-temperature stability, the content of (A) is preferably from 1.0% by mass to 25% by mass, and more preferably from 3% by mass to 7% by mass, based on the total amount of the liquid skin cleanser composition. When the content of (A) is 1.0% by mass or more based on the total amount of the liquid skin cleansing composition, good foaming is achieved when the composition is discharged from a foamer container, which is preferable. When the content of (A) is 25% by mass or less based on the total amount of the liquid skin cleansing composition, this is preferable because it provides good foam removal during rinsing and good low-temperature stability.

[0025] <(B) Amino alcohol> The amino alcohol as component (B) is contained to improve low temperature stability.

[0026] The (B) amino alcohol is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of achieving good low-temperature stability and yellowing inhibition effect, monoethanolamine, diethanolamine, and triethanolamine are preferred. These may be used alone or in combination of two or more.

[0027] The content of the (B) amino alcohol is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of obtaining good low-temperature stability and yellowing inhibition effect, however, the content is preferably from 0.5% by mass to 2% by mass, and more preferably from 0.7% by mass to 1% by mass, based on the total amount of the liquid skin cleanser composition. It is preferable that the content of the amino alcohol (B) is 0.5% by mass or more based on the total amount of the liquid skin cleanser composition, since this leads to good low-temperature stability. If the content of the amino alcohol (B) is 2 mass % or less based on the total amount of the liquid skin cleanser composition, the yellowing suppression effect is favorable.

[0028] The amino alcohol (B) may be a synthesized product or a commercially available product, such as monoethanolamine, diethanolamine, or triethanolamine (all manufactured by Nippon Shokubai Co., Ltd.).

[0029] <(C) Any salt selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate> The component (C) is blended to improve the foam-removal effect during rinsing and the effect of inhibiting yellowing.

[0030] The dihydrogen phosphate salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the dihydrogen phosphate salt include potassium dihydrogen phosphate and sodium dihydrogen phosphate. The hydrogen phosphate is not particularly limited and may be appropriately selected depending on the purpose. Examples of the hydrogen phosphate include dipotassium hydrogen phosphate and disodium hydrogen phosphate. The phosphate is not particularly limited and can be appropriately selected depending on the purpose. Examples of the phosphate include sodium phosphate and tripotassium phosphate. The tripolyphosphate is not particularly limited and can be appropriately selected depending on the purpose. Examples of the tripolyphosphate include potassium tripolyphosphate and sodium tripolyphosphate. The polyphosphate is not particularly limited and can be appropriately selected depending on the purpose. Examples of the polyphosphate include potassium polyphosphate and sodium polyphosphate. The pyrophosphate salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the pyrophosphate salt include sodium pyrophosphate and potassium pyrophosphate. Among these, from the viewpoints of achieving good foam removal during rinsing and good yellowing suppression effects, dihydrogen phosphates, that is, potassium dihydrogen phosphate and sodium dihydrogen phosphate, are preferred.

[0031] The content of the (C) component is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of achieving good foam-breaking during rinsing and good yellowing suppression effect, the content is preferably from 0.05% by mass to 3% by mass, and more preferably from 0.2% by mass to 1.0% by mass, based on the total amount of the liquid skin cleanser composition. It is preferable that the content of the component (C) is 0.05% by mass or more based on the total amount of the liquid skin cleanser composition, since this leads to a good yellowing suppression effect. If the content of the component (C) is 3 mass % or less based on the total amount of the liquid skin cleansing composition, this is preferable because it provides good foam removal during rinsing and good inhibition of yellowing.

[0032] The component (C) may be appropriately synthesized or may be a commercially available product. Examples of commercially available products of the component (C) include, by trade name, potassium dihydrogen phosphate, sodium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium phosphate, tripotassium phosphate, potassium tripolyphosphate, sodium tripolyphosphate, potassium polyphosphate, sodium pyrophosphate (all manufactured by Taihei Chemical Industry Co., Ltd.), sodium polyphosphate, disodium hydrogen phosphate (all manufactured by Fujifilm Wako Pure Chemical Industries Co., Ltd.), and potassium pyrophosphate (manufactured by Yoneyama Chemical Industry Co., Ltd.).

[0033] <(D) Any one selected from mannitol, xylitol, erythritol, lactitol, and palatinit> The component (D) is blended to improve the foam-removal effect during rinsing and the effect of inhibiting yellowing.

[0034] As the component (D), mannitol is preferred from the viewpoints of improving foam removal during rinsing and inhibiting yellowing.

[0035] The content of the (D) component is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of achieving good foam-breaking during rinsing and good yellowing suppression effect, the content is preferably from 0.1% by mass to 3% by mass, and more preferably from 0.5% by mass to 2% by mass, based on the total amount of the liquid skin cleanser composition. It is preferable that the content of the component (D) is 0.1 mass % or more based on the total amount of the liquid skin cleansing composition, since this provides a good yellowing suppression effect. If the content of the component (D) is 3 mass % or less based on the total amount of the liquid skin cleansing composition, this is preferable because it provides good foam removal during rinsing and good inhibition of yellowing.

[0036] The component (D) may be appropriately synthesized or may be a commercially available product, such as mannitol, xylitol, erythritol, lactitol (all manufactured by Bussan Food Science Co., Ltd.), and Palatinit (manufactured by DM Mitsui Sugar Holdings Co., Ltd.).

[0037] -Mass ratio [(B) / {(C)+(D)}]- In this specification, "the mass ratio of the content of (B) to the sum of the content of (C) and the content of (D)" may be referred to as the mass ratio [(B) / {(C)+(D)}]. In the liquid skin cleansing composition of the present invention, the mass ratio [(B) / {(C)+(D)}] is from 0.3 to 2. Moreover, from the viewpoint of obtaining good yellowing suppression effect and low temperature stability, the mass ratio [(B) / {(C)+(D)}] is preferably from 0.4 to 1.8. It is preferable for the mass ratio [(B) / {(C)+(D)}] to be 0.3 or more since the low temperature stability is good. It is preferable that the mass ratio [(B) / {(C)+(D)}] is 2 or less since the yellowing suppression effect is good.

[0038] -Mass ratio [(C) / (D)]- In this specification, "the mass ratio of the content of (C) to the content of (D)" may be referred to as "mass ratio [(C) / (D)]". The mass ratio [(C) / (D)] is not particularly limited and can be set appropriately depending on the purpose. From the viewpoint of achieving good foam removal during rinsing, however, it is preferably 0.05 or more and 5 or less, and more preferably 0.2 or more and 1 or less. It is preferable that the mass ratio [(C) / (D)] is 0.05 or more since this leads to good foam removal during rinsing. It is preferable that the mass ratio [(C) / (D)] is 5 or less since this allows for good foam removal during rinsing.

[0039] <Other ingredients> In addition to the components (A), (B), (C), and (D), the liquid skin cleanser composition of the present invention may contain other components that are typically used in liquid skin cleanser compositions, as necessary, within the scope of the present invention.

[0040] The other components are not particularly limited and can be appropriately selected depending on the purpose. Examples of the other components include surfactants other than the component (A), water-soluble polymers, oils, silicones, alcohols other than the component (B), lanolin derivatives, protein derivatives, amino acids, vitamins and other drugs, bactericides, preservatives, pH adjusters, antioxidants, sequestering agents, animal and plant extracts or derivatives thereof, chelating agents, moisturizers, thickeners, ultraviolet absorbing agents or scattering agents, dyes, pigments, water-insoluble polymer compound powders, and the like.

[0041] The oil is not particularly limited and can be appropriately selected depending on the purpose. Examples of the oil include vegetable oils and fats such as castor oil, olive oil, cacao oil, hardened palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, avocado oil, and ester compounds thereof; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These may be used alone or in combination of two or more. The content of the oil is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably from 0.1% by mass to 3% by mass based on the total amount of the liquid skin cleansing composition.

[0042] The alcohol other than the component (B) is not particularly limited and may be appropriately selected depending on the purpose, and may be a lower alcohol or a higher alcohol. Specific examples of the alcohol include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyl decanol, octyldodecanol, and lauryl alcohol. These may be used alone or in combination of two or more. The content of the alcohol is not particularly limited and can be appropriately selected depending on the purpose, but is preferably from 0.01% by mass to 15% by mass based on the total amount of the liquid skin cleansing composition.

[0043] The moisturizer is not particularly limited and can be appropriately selected depending on the purpose. Examples of the moisturizer include isoprene glycol, propylene glycol, glycerin, 1,3-butylene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, and polyglycerin. These may be used alone or in combination of two or more. The content of the moisturizing agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably from 0.01% by mass to 10.0% by mass based on the total amount of the liquid skin cleansing composition.

[0044] The thickener is not particularly limited and can be appropriately selected depending on the purpose. Examples of the thickener include natural polymers such as sodium alginate, xanthan gum, aluminum silicate, quince seed extract, tragacanth gum, and starch, semi-synthetic polymers such as methylcellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, and soluble starch, and synthetic polymer compounds such as carboxyvinyl polymer, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, and methacryloylethyl betaine-methacrylic acid ester copolymer. These may be used alone or in combination of two or more. The content of the thickener is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably from 0.01% by mass to 1.0% by mass based on the total amount of the liquid skin cleansing composition.

[0045] The preservative is not particularly limited and can be appropriately selected depending on the purpose. Examples of the preservative include benzoates, sorbates, dehydroacetates, paraoxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone-methylisothiazolinone solution (product name: Cason CG, manufactured by Rohm and Haas Japan), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used alone or in combination of two or more. The content of the preservative is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably from 0.01% by mass to 1.0% by mass based on the total amount of the liquid skin cleansing composition.

[0046] The antioxidant is not particularly limited and can be appropriately selected depending on the purpose. Examples of the antioxidant include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid. These may be used alone or in combination of two or more. The content of the antioxidant is not particularly limited and can be appropriately selected depending on the purpose, but is preferably from 0.001% by mass to 1.0% by mass based on the total amount of the liquid skin cleansing composition.

[0047] The chelating agent is not particularly limited and can be appropriately selected depending on the purpose. Examples of the chelating agent include edetic acid, edetate disodium, ethylenediaminetetraacetate, hexametaphosphate, and gluconic acid. These may be used alone or in combination of two or more. The content of the chelating agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably from 0.001% by mass to 5.0% by mass based on the total amount of the liquid skin cleansing composition.

[0048] The pH adjuster is not particularly limited and can be appropriately selected depending on the purpose. Examples of the pH adjuster include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, aqueous ammonia, phosphoric acid, glycolic acid, and hydrochloric acid. These may be used alone or in combination of two or more.

[0049] The ultraviolet absorbing agent or scattering agent is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl paraaminobenzoate, ethylhexyl paramethoxycyanamate, titanium oxide, kaolin, and talc. These may be used alone or in combination of two or more. The content of the ultraviolet absorbing agent or scattering agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.01% by mass or more and 1.0% by mass or less based on the total amount of the liquid skin cleansing composition.

[0050] The vitamins are not particularly limited and can be appropriately selected depending on the purpose. Examples of the vitamins include vitamin A, B vitamins, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid, and derivatives thereof. These may be used alone or in combination of two or more. The content of the vitamins is not particularly limited and can be appropriately selected depending on the purpose, but is preferably from 0.01% by mass to 1.0% by mass based on the total amount of the liquid skin cleansing composition.

[0051] The amino acids are not particularly limited and can be appropriately selected depending on the purpose. 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 and can be appropriately selected depending on the purpose, but is preferably from 0.01% by mass to 1.0% by mass based on the total amount of the liquid skin cleansing composition.

[0052] The water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose. Examples of the water-insoluble polymer compound powder include inorganic powder, clay mineral, nylon, and polyethylene. These may be used alone or in combination of two or more. The content of the water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 0.1% by mass or less based on the total amount of the liquid skin cleansing composition.

[0053] The other components may be appropriately synthesized or commercially available products. The content of the other components relative to the total amount of the liquid skin cleansing composition is not particularly limited and may be appropriately selected depending on the purpose.

[0054] -pH- The pH of the liquid skin cleansing composition at 25° C. is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 9.5 to 11.0, and more preferably 9.8 to 10.6. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (TOA DKK, electrode type GST-5721).

[0055] -viscosity- The viscosity of the liquid skin cleansing composition at 25° C. is preferably 20 mPa·s or less, and more preferably from 3 mPa·s to 10 mPa·s. The viscosity can be measured, for example, using a BM type viscometer (manufactured by Tokyo Keiki Co., Ltd.) at a sample temperature of 25° C., at a rotation speed of 60 rpm, and after 1 minute using rotor No. 1.

[0056] -container- The liquid skin cleansing composition of the present invention is preferably used by filling it into a foamer container. The foamer container is not particularly limited and can be appropriately selected from known foamer containers, for example, a non-gas type foamer container, an aerosol container using a propellant and a pressure-resistant container, etc. Among these, a non-gas type foamer container is preferred.

[0057] The non-gas type foam-discharging container is not particularly limited as long as it can mix the liquid skin cleanser composition with air and discharge it in a foamed state, and can be appropriately selected according to the purpose, and examples thereof include a squeeze foamer container that can discharge foam by squeezing the bottle body by hand, and a pump foamer container that can discharge foam by pushing down the nozzle. Such foamer containers can be manufactured by Yamato Can Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, the foamer containers that can be used include those described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972.

[0058] The non-gas type foam dispensing container has a foam-forming member, specifically, a porous membrane body (preferably made of a plastic material such as nylon, polyester, polyolefin, etc.) for forming foam, and foam is formed by the liquid skin cleansing composition passing through the porous membrane body.

[0059] The mesh of the porous membrane is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 100 mesh or more, more preferably 100 to 400 mesh, and particularly preferably 200 to 305 mesh. The number of the porous membrane bodies is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of improving the foam performance, 2 to 4 sheets are preferable.

[0060] -Manufacturing method- The method for producing the liquid skin cleanser composition is not particularly limited and may be appropriately selected depending on the purpose. For example, the liquid skin cleanser composition may be obtained by mixing the component (A), the component (B), the component (C), the component (D), and, if necessary, the other components, and purified water (blended as the balance so that the total amount of the liquid skin cleanser composition becomes 100% by mass). Specifically, a mixture is prepared using other components such as purified water and propylene glycol in an amount that accounts for 60% by mass of the total amount of the final liquid skin cleanser composition, and the mixture is then heated to 70°C to 80°C to dissolve the components (A), (B), (C), and (D), as well as potassium hydroxide as another component, to obtain the liquid skin cleanser composition.

[0061] The liquid skin cleanser composition may be prepared using an apparatus that is not particularly limited and may be appropriately selected depending on the purpose, and examples of the apparatus include a stirring apparatus equipped with stirring blades that exert a shearing force and can mix the entire composition. The stirring blade is not particularly limited and can be appropriately selected depending on the purpose. Examples of the stirring blade include a propeller, a turbine, and a disperser.

[0062] -Applications- The area where the liquid skin cleansing composition is applied is not particularly limited and can be appropriately selected depending on the purpose. For example, the composition can be applied to the whole body, face, hands, etc.

[0063] The liquid skin cleanser composition has excellent foaming performance (good foaming and foam-rinsing properties during rinsing), as well as excellent low-temperature stability and yellowing suppression effect, and can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in body soaps. EXAMPLES

[0064] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. The content of each component described in the examples and comparative examples is shown in "mass %", the total amount is 100 mass %, and all values ​​are calculated as pure contents.

[0065] (Examples 1 to 21 and Comparative Examples 1 to 7) Liquid skin cleansing compositions having the compositions and contents shown in Examples 1 to 21 and Comparative Examples 1 to 7 were prepared according to the following method. Specifically, using other components such as purified water and propylene glycol, a mixture was prepared in an amount that would account for 60% by mass of the total amount of the liquid skin cleansing composition finally obtained. The mixture of other components was heated to 70°C to 80°C, and then the components (A), (B), (C), (D), and potassium hydroxide, which was another component, were dissolved therein. Thereafter, if the pH did not reach a predetermined level, potassium hydroxide, which was a common component, was added to adjust the pH to 10, and purified water was added until the total amount reached 100% by mass, thereby obtaining the liquid skin cleansing compositions of the Examples and Comparative Examples. The components were mixed using a propeller as a stirring blade and a Three-One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.). The pH was measured at 25° C. using a pH meter (HM-30R, manufactured by TOA DKK). The viscosity of the obtained liquid skin cleansing composition was measured at a constant temperature of 25°C using a BM type viscometer (manufactured by Tokyo Keiki Co., Ltd.) at 25°C using a spindle No. 1 rotor at a rotation speed of 60 rpm for 1 minute. Furthermore, each of the obtained liquid skin cleansing compositions of Examples 1 to 21 and Comparative Examples 1 to 7 was filled into a container equipped with a foamer pump dispenser [discharge volume 1 mL, manufactured by Yoshino Kogyosho Co., Ltd.].

[0066] For each of the liquid skin cleansing compositions of Examples 1 to 21 and Comparative Examples 1 to 7, "foaming when discharged from a foamer container," "low-temperature stability," "yellowing suppression effect," and "foam removal during rinsing" were evaluated and judged as follows. The results are shown in Tables 1 to 4 below.

[0067] <Foaming when discharged from the foamer container> The liquid skin cleansing composition of each of Examples 1 to 21 and Comparative Examples 1 to 7 was filled in 100 mL into the pump foamer container, and the operation of discharging the composition by one expert panelist was repeated five times. The dischargeability of the foam was evaluated based on the following criteria. The number of samples was three, and a score of "○" or higher was considered to be acceptable. -Evaluation criteria- ◎: The entire foam ejected is fine. 〇: Some coarse bubbles are mixed in the discharged foam, but it can be discharged as a relatively fine foam. △: More than 50% of the foam discharged is coarse. ×: No discharge and no foam formed

[0068] <Low temperature stability> The liquid skin cleansing compositions of Examples 1 to 21 and Comparative Examples 1 to 7 were stored at -5°C for one month, then returned to room temperature and observed to evaluate the presence or absence of precipitates or aggregates according to the following evaluation criteria. The number of samples was 3, and a score of "◯" or higher was considered to be acceptable. -Evaluation criteria- ◎: No precipitates or aggregates were observed ○: Almost no precipitates or agglomerates are observed △: Precipitates and aggregates can be seen ×: Precipitates and aggregates are clearly visible.

[0069] <Yellowing prevention effect> The liquid skin cleansing compositions of Examples 1 to 21 and Comparative Examples 1 to 7 were stored at 50°C for one month, then returned to room temperature and observed, and the change in appearance compared with that stored at room temperature for one month (product stored at room temperature) was evaluated according to the following evaluation criteria. The number of samples was 3, and a score of "◯" or higher was considered to be acceptable. -Evaluation criteria- ◎: No change in appearance compared to room temperature storage ○: Almost no yellowing compared to room temperature storage △: Yellowing can be seen compared to products stored at room temperature ×: Yellowing is evident compared to products stored at room temperature.

[0070] <Foam loss during rinsing> Ten expert evaluators took two pumps (about 2 g) of the liquid skin cleansing composition of Examples 1 to 21 and Comparative Examples 1 to 7 into the hand, lathered it, and then rinsed it at a speed of 1 second per second to evaluate the foam-rinsing quality according to the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators, and judged according to the following criterion for judging the average score. A score of "◯" or higher was considered to be a pass. -Evaluation criteria- 4 points: Very good foam removal 3 points: Good foam removal 2 points: The foam doesn't rinse off very well 1 point: The foam does not rinse off easily -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 ×: 1.0 or more and less than 2.0 points

[0071] [Table 1]

[0072] [Table 2]

[0073] [Table 3]

[0074] [Table 4]

[0075] Details of each component used in Examples 1 to 21 and Comparative Examples 1 to 7 are shown in Table 5 below.

[0076] [Table 5] *1: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, NOF Corporation) with potassium hydroxide (AGC Corporation, liquid caustic potash). *2: Potassium myristate was prepared by neutralizing myristic acid (NAA-142, NOF Corporation) with potassium hydroxide (AGC Corporation, liquid caustic potash). *3: Potassium palmitate was prepared by neutralizing palmitic acid (NAA-160, NOF Corporation) with potassium hydroxide (AGC Corporation, liquid caustic potash). [Industrial Applicability]

[0077] The liquid skin cleanser composition has excellent foaming performance (good foaming and foam-rinsing properties during rinsing), as well as excellent low-temperature stability and yellowing suppression effect, and can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in body soaps.

Claims

1. (A) an anionic surfactant; (B) an amino alcohol; (C) any salt selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate; (D) any one selected from mannitol, xylitol, erythritol, lactitol, and palatinite; A liquid skin cleansing composition, wherein a mass ratio of the content of said (B) to the sum of the content of said (C) and the content of said (D), [(B) / {(C)+(D)}], is 0.3 or more and 2 or less.

2. 2. The liquid skin cleansing composition according to claim 1, wherein a mass ratio of the content of said (C) to the content of said (D) [(C) / (D)] is 0.2 or more and 1 or less.

3. The liquid skin cleanser composition according to claim 1 or 2, wherein the liquid skin cleanser composition is for use in a foamer container.

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