Liquid skin cleanser

Abstract

To provide a liquid skin cleanser which is mild to the skin and suppresses discoloration due to light irradiation while securing excellent detergency, foaming properties and foam quality.SOLUTION: There is provided a liquid skin cleanser obtained by filling a liquid composition comprising the following components (A), (B), (C), (D) and (E): (A) an anionic surfactant, (B) less than 3 mass% of a nonionic surfactant having a sugar skelton, (C) a polyhydric alcohol, (D) 0.000001 to 0.001 mass% of a colorant selected from Yellow No.4, yellow No. 5, yellow No. 205, yellow No. 401, Yellow No. 402, yellow No. 404, yellow No. 405, yellow No. 406 and yellow No. 407 and (E) a perfume in a transparent container.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a liquid skin cleanser filled in a transparent container. [Background technology]

[0002] Cleansers for use on the body are required to be mild to the skin, yet have strong cleaning power and produce good foaming and foam quality, and much research is being conducted on these issues. Recently, there has been a demand for adding value to cleaning agents, and products with beautiful and eye-catching appearances, such as transparent appearances and filling transparent containers, are being considered. On the other hand, because changes in appearance due to storage are noticeable to consumers, studies are also being conducted on ways to suppress such changes in appearance.

[0003] For example, Patent Document 1 describes that soap-based skin cleansing agents have a problem of precipitating at low temperatures, and transparent formulations become cloudy, but by using a combination of an alkylsulfobetaine surfactant, a straight-chain fatty acid alkanolamide surfactant, and a fatty acid and its potassium salt, a soap-based skin cleansing agent composition can be obtained that maintains transparency even in a low-temperature environment and has good foam quality, feel after washing, and usability. Patent Document 2 describes that compositions for scalp and hair containing carotene (vitamin A) and tocopherol (vitamin E) tend to discolor and fade due to light, but by blending pyrophosphoric acid, edetic acid, glycolic acid, etc. in specific ratios, discoloration and fading due to light are suppressed and deterioration of appearance can be prevented. It is also known that fragrances contained in skin cleansers have the problem of discoloration. For example, Patent Document 3 describes that ammonium ions and primary amines in the composition react with the carbonyl group of the fragrance compound and discolor, so by making a composition that does not contain primary amines or ammonia in a composition that contains a carbonyl-containing fragrance compound, it is possible to obtain a shampoo composition that is substantially colorless for a long period of time, at the same time providing good cleansing and foaming properties, and is mild to the skin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-197453 A [Patent Document 2] JP 2008-273888 A [Patent Document 3] Japanese Patent Application Publication No. 8-501101 Summary of the Invention [Problem to be solved by the invention]

[0005] The inventors considered filling a transparent skin cleanser into a transparent container in order to create a skin cleanser that is mild to the skin, has excellent cleaning power and foam quality, and has a beautiful appearance that is easily noticeable to consumers; however, the skin cleanser sometimes turns yellow during storage. The present invention aims to provide a skin cleanser contained in a transparent container, which ensures excellent cleaning power, foaming and foam quality while suppressing discoloration due to light irradiation. [Means for solving the problem]

[0006] The inventors hypothesized that filling a liquid detergent composition into a transparent container exposed the detergent composition to direct light during storage, causing discoloration of the detergent composition due to the light and the increase in temperature associated with light exposure. After various investigations, they found that problems were likely to arise when trying to achieve the thick, bouncy foam quality characteristic of skin cleansers. In light of this, we investigated skin cleansing compositions that suppress the progression of discoloration due to light exposure and ensure foam quality, and found that by containing a specific range of nonionic surfactants having a sugar skeleton, and a polyhydric alcohol and a very small amount of a specific colorant, it is possible to obtain a liquid skin cleansing composition that significantly reduces color change due to light exposure, even in a liquid cleansing composition that contains a fragrance, and thus completed the present invention.

[0007] The present invention comprises the following components (A), (B), (C), (D) and (E): (A) an anionic surfactant, (B) less than 3% by mass of a nonionic surfactant having a sugar skeleton, (C) polyhydric alcohol, (D) 0.000001 to 0.001 mass% of a colorant selected from Yellow No. 4, Yellow No. 5, Yellow No. 205, Yellow No. 401, Yellow No. 402, Yellow No. 404, Yellow No. 405, Yellow No. 406, and Yellow No. 407, (E)Fragrance The present invention relates to a liquid skin cleansing agent in which a liquid composition containing the above is filled in a transparent container. Effect of the Invention

[0008] The liquid skin cleanser of the present invention ensures excellent cleansing power, foaming and foam quality (easy to spread and thick foam), while suppressing discoloration due to exposure to light. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The anionic surfactant of component (A) used in the present invention may be any one that is used in ordinary skin cleansing agents, and examples thereof include polyoxyalkylene alkyl ether carboxylic acid or a salt thereof, alkyl sulfuric acid or a salt thereof, polyoxyalkylene alkyl ether sulfuric acid or a salt thereof, polyoxyalkylene alkenyl ether sulfuric acid or a salt thereof, sulfosuccinic acid alkyl ester or a salt thereof, polyoxyalkylene sulfosuccinic acid alkyl ester or a salt thereof, α-olefin sulfonic acid or a salt thereof, fatty acid or a salt thereof, N-acylated amino acid or a salt thereof, N-acylalkyltaurine or a salt thereof, and the like.

[0010] (A1) The polyoxyalkylene alkyl ether carboxylic acid or a salt thereof includes a polyoxyethylene alkyl ether carboxylate represented by the following general formula (1). R 1 O(CH 2 CH 2 O) m CH 2COOM 1 (1) (In the formula, R 1 represents an alkyl or alkenyl group having 4 to 22 carbon atoms, m is the average number of moles added and is a number from 0.5 to 15, M 1 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or an organic ammonium.

[0011] In general formula (1), R 1 From the viewpoints of foaming ability and reduced irritation to stratum corneum cells, the alkyl group is preferably an alkyl group having 12 to 16 carbon atoms, and more preferably an alkyl group having 12 to 14 carbon atoms. From the above viewpoints, the average number of moles m of ethylene oxide added is preferably 1 to 10. M 1 Examples of the ammonium salt include hydrogen atoms, alkali metals such as sodium and potassium, alkaline earth metals such as calcium and magnesium, ammonium, ammonium derived from alkanolamines such as monoethanolamine, diethanolamine and triethanolamine, and ammonium derived from basic amino acids such as arginine and lysine. Among these, from the above-mentioned viewpoint, it is preferable to contain one or more types selected from sodium, potassium, triethanolamine and arginine, and it is more preferable to contain one or two types selected from sodium and potassium.

[0012] Specifically, such polyoxyethylene alkyl ether carboxylic acid or a salt thereof preferably includes one or more selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, polyoxyethylene myristyl ether carboxylic acid or a salt thereof, and polyoxyethylene palmityl ether carboxylic acid or a salt thereof, more preferably includes one or two selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, and polyoxyethylene myristyl ether carboxylic acid or a salt thereof, and even more preferably includes polyoxyethylene lauryl ether carboxylic acid or a salt thereof. Examples of commercially available products of these include Kao Akipo RLM-45 (manufactured by Kao Corporation), Kao Akipo RLM-45NV (manufactured by Kao Corporation), Kao Akipo RLM-100 (manufactured by Kao Corporation), and Kao Akipo RLM-100NV (manufactured by Kao Corporation).

[0013] (A2) The alkyl sulfate or polyoxyalkylene alkyl ether sulfate includes polyoxyethylene alkyl ether sulfate represented by the following general formula (2) or a salt thereof. R 2 O(CH 2 CH 2 O) p SO 3 M 2 (2) (In the formula, R 2 represents an aliphatic hydrocarbon group having 8 to 22 carbon atoms, M 2 represents a cation selected from alkali metals, alkaline earth metals, ammonium, alkylammonium, alkanolammonium, and glucammonium, and p represents the average number of moles added and is a number from 0 to 20.

[0014] In general formula (2), R 2 From the viewpoint of foaming property and blend stability, the alkyl group is preferably an aliphatic hydrocarbon group having 8 to 18 carbon atoms, more preferably an aliphatic hydrocarbon group having 8 to 16 carbon atoms, and even more preferably an aliphatic hydrocarbon group having 10 to 16 carbon atoms. Furthermore, an alkyl or alkenyl group having 8 to 16 carbon atoms is preferable, an alkyl or alkenyl group having 10 to 16 carbon atoms is more preferable, and an alkyl or alkenyl group having 10 to 14 carbon atoms is even more preferable. From the viewpoint of foamability, p is preferably from 0.5 to 3.0, and more preferably from 1.0 to 2.0. M 2 From the viewpoint of foaming properties and blend stability, the additive is preferably an alkali metal or ammonium, and more preferably contains one or two types selected from sodium and ammonium.

[0015] Specific examples thereof include sodium polyoxyethylene (1-2) alkyl ether sulfates such as polyoxyethylene (1) lauryl ether sulfate, polyoxyethylene (1) lauryl ether ammonium sulfate, polyoxyethylene (1) myristyl ether sulfate, polyoxyethylene (2) lauryl ether sulfate, and polyoxyethylene (2) myristyl ether sulfate. In the present invention, the numerical values ​​in parentheses for these compounds indicate the average number of moles of ethylene oxide added. Commercially available products of these include, for example, EMAL 125HP (manufactured by Kao Corporation, polyoxyethylene (1) lauryl ether sodium sulfate), EMAL 125A (manufactured by Kao Corporation, polyoxyethylene (1) lauryl ether ammonium sulfate), and EMAL 227HP (manufactured by Kao Corporation, polyoxyethylene (2) lauryl ether sodium sulfate).

[0016] (A3) The acylated amino acid or a salt thereof is, for example, an acylated amino acid represented by the general formula (3):

[0017] [ka]

[0018] (In the formula, R 3 represents a linear or branched alkyl or alkenyl group having 7 to 21 carbon atoms; R 4 represents a hydrogen atom or an alkyl or alkenyl group having 1 to 4 carbon atoms; R 5 is a hydrogen atom or -(CH 2 ) q R 6 (R 6 represents a hydrogen atom, a hydroxyl group or -COOM, and q represents 0 to 3), M 3 represents a hydrogen atom, an alkali metal, or an alkanolamine. Preferred is an N-acylamino acid salt represented by the following formula:

[0019] In formula (3), R 3R is preferably an alkyl group having 6 to 18 carbon atoms, and more preferably an alkyl group having 10 to 16 carbon atoms. 4 R is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and more preferably a hydrogen atom or a methyl group. 5 Examples include hydrogen atom, -(CH 2 ) q R 6 is preferred. 3 As the alkali metal, an alkali metal is preferable.

[0020] Specific examples of N-acylamino acid salts represented by general formula (3) include N-acylglycine salts such as N-cocoylglycine salts and N-lauroyl-N-methylglycine salts; N-acylglutamate salts such as N-lauroylglutamate and N-myristoylglutamate; N-acylalanine salts such as N-lauroyl-β-alanine salts and N-myristoyl-β-alanine salts; N-acylaspartates such as N-lauroylaspartate; N-acylserine salts such as N-lauroylserine salt; and alkali metal salts such as sodium and potassium thereof; alkanolamine salts such as monoethanolamine, diethanolamine, and triethanolamine. The compounds represented by general formula (4) are available in L-form, D-form, and racemic form, and any of these can be used in the present invention. Of these, N-acylglycine salts and N-acylaspartate salts are preferred.

[0021] (A4) The fatty acid or salt thereof includes a fatty acid having 10 to 22 carbon atoms or a salt thereof. As the fatty acid having 10 to 22 carbon atoms or a salt thereof, from the viewpoints of blend stability and foaming property, those containing a fatty acid having a linear or branched alkyl group having 10 to 18 carbon atoms are preferable, and those containing a fatty acid having a linear alkyl group having 12 to 14 carbon atoms are more preferable. Specifically, one or more selected from laurate, myristate, palmitate, stearate, and behenate can be mentioned, and from the above viewpoint, one or two selected from laurate, myristate, and stearate are more preferable. These salts preferably contain one or more types selected from alkali metals and ammonium, more preferably contain one or more types selected from alkali metals, and further preferably are sodium salts and potassium salts.

[0022] As component (A), from the viewpoints of providing a good feeling when used, reducing irritation to the skin, and providing a mild feeling to the skin, polyoxyethylene alkyl ether carboxylic acid or a salt thereof, and N-acyl amino acid or a salt thereof are preferred.

[0023] The anionic surfactant may be contained in the liquid composition as a neutralized salt. The neutralized salt may be any of those mentioned above, but from the viewpoint of further improving storage stability at low temperatures, an alkanolamine salt of component (A) may be contained. From the viewpoint of suppressing discoloration of the liquid composition due to long-term irradiation with light, the content of the alkanolamine salt of component (A) in the liquid composition is preferably less than 0.1% by mass, more preferably 0.05% by mass or less, and even more preferably not contained.

[0024] The component (A) may be used alone or in combination of two or more, and the content in the liquid composition is preferably 0.1 to 20% by mass, more preferably 0.5 to 16% by mass, and even more preferably 1.0 to 12% by mass, from the viewpoints of cleaning power and foaming. The content of the component (A) in the liquid composition is preferably 2.5% by mass or more, more preferably 5% by mass or more, and even more preferably 8% by mass or more, from the viewpoints of suppressing discoloration of the liquid composition due to long-term irradiation with light. The content of the component (A) in the liquid composition is preferably 12% by mass or less, more preferably 11% by mass or less, and even more preferably 10% by mass or less, from the viewpoints of increasing the visible light transmittance (transmittance at a wavelength of 600 nm) of the liquid composition.

[0025] Component (B) is a nonionic surfactant having a sugar skeleton, and is a component that improves foam quality in combination with component (A). The sugar skeleton refers to monosaccharides and structures derived from monosaccharides, such as glucoside, sorbitan, and sucrose. Examples of component (B) include (B1) alkyl glucoside, (B2) polyoxyethylene sorbitan fatty acid ester, and (B3) sucrose fatty acid ester.

[0026] The (B1) alkyl glucoside is one that is used in ordinary cleaning agents and is preferably an alkyl glucoside having an alkyl group having 8 to 20 carbon atoms, and from the viewpoints of foaming, foam retention, and low-temperature stability, more preferably an alkyl glucoside having an alkyl group having 10 to 16 carbon atoms.

[0027] Component (B1) can be used alone or in combination of two or more types. From the viewpoint of suppressing discoloration due to long-term exposure to light, the content in the liquid composition is preferably 1.5% by mass or less, more preferably 1% by mass or less, even more preferably 0.5% by mass or less, and even more preferably none is contained.

[0028] As the (B2) polyoxyethylene sorbitan fatty acid ester, those which are used in ordinary detergents, have fatty acids with an alkyl group having 12 to 22 carbon atoms, and have a degree of polymerization of ethylene oxide of 10 to 300 are preferred. From the viewpoints of foam quality, foaming ability and low temperature stability, the component (B2) preferably has an HLB of 10 to 20, and more preferably an HLB of 13 to 20. Here, the HLB value is an index showing the hydrophilic-lipophilic balance, and in this specification, the value calculated by the following formula by Griffin is used.

[0029]

number

[0030] Examples of the polyoxyethylene sorbitan fatty acid ester of component (B2) include polyoxyethylene sorbitan coconut oil fatty acid ester, polyoxyethylene sorbitan laurate, polyoxyethylene sorbitan myristate, polyoxyethylene sorbitan palmitate, polyoxyethylene sorbitan isostearate, polyoxyethylene sorbitan stearate, polyoxyethylene sorbitan oleate, polyoxyethylene sorbitan behenate, polyoxyethylene sorbitan tristearate, and polyoxyethylene triisostearate. Among these, from the viewpoint of low-temperature stability, the number of carbon atoms in the alkyl group of the fatty acid constituting the polyoxyethylene sorbitan fatty acid ester is preferably 12 to 18, more preferably 12 to 16, and even more preferably 12 to 14. The degree of polymerization of ethylene oxide is preferably 5 to 300, more preferably 10 to 100, and even more preferably 20 to 80. Furthermore, the polyoxyethylene sorbitan fatty acid ester is preferably a polyoxyethylene mono fatty acid ester.

[0031] Component (B) can be used alone or in combination of two or more types. From the viewpoint of suppressing discoloration due to long-term exposure to light, the content in the liquid composition is less than 3 mass%, preferably 2 mass% or less, more preferably 1 mass% or less, and even more preferably none is contained. On the other hand, from the viewpoint of achieving both foam quality and discoloration inhibition at a better level, it is preferable to contain component (B). From the viewpoint of achieving both foam quality and discoloration inhibition at a better level, component (B) contained in the composition is preferably (B2) polyoxyethylene sorbitan fatty acid ester, and from the viewpoint of achieving both foam quality and discoloration inhibition at a higher level, the content of component (B) in the liquid composition is preferably 0.1 to 3 mass%, more preferably 0.5 to 2 mass%. From the same viewpoint, the content of (B1) alkyl glucoside in the liquid composition is preferably 1.5 mass% or less, more preferably 10 mass% or less, and even more preferably 0.5 mass% or less, and the content of (B2) polyoxyethylene sorbitan fatty acid ester in the liquid composition is preferably 0.5 to 3 mass%, and more preferably 1 to 2 mass%.

[0032] The polyhydric alcohol of component (C) used in the present invention is one that is used in ordinary cleaning agents, and examples thereof include dihydric alcohols such as ethylene glycol, diethylene glycol, hexylene glycol, polyethylene glycols having an average molecular weight of 10,000 or less, propylene glycol, 1,3-propanediol, dipropylene glycol, polypropylene glycol, isoprene glycol, and 1,3-butylene glycol; trihydric or higher alcohols such as glycerin, diglycerin, triglycerin, tetraglycerin, hexaglycerin, decaglycerin, and trimethylpropanol; and sugars or sugar alcohols such as erythritol, pentaerythritol, dipentaerythritol, glucose, mannose, galactose, sucrose, fructose, maltose, maltitol, xylitol, inositol, sorbitan, and sorbitol. Of these, glycerin and polyethylene glycol are preferred from the viewpoints of suppressing discoloration of the composition and sufficiently improving foam quality.

[0033] The polyhydric alcohol of component (C) can be used alone or in combination of two or more kinds. From the viewpoints of suppressing discoloration of the composition and improving foam quality (ease of spreading the foam, feeling of thick foam), the content in the liquid composition is preferably 0.5 to 35 mass%, more preferably 1 to 30 mass%, and even more preferably 2 to 25 mass%.

[0034] Moreover, from the viewpoint of further improving foam quality, it is preferable that the polyhydric alcohol of component (C) contains (C1) glycerin. From the viewpoint of further improving foam quality, the content of (C1) glycerin in the liquid composition is preferably from 0.5 to 20 mass %, more preferably from 3 to 17 mass %, and even more preferably from 5 to 15 mass %.

[0035] In the present invention, the mass ratio (A) / (C) of component (A) to component (C) is preferably 0.1 to 40, more preferably 0.2 to 20, and even more preferably 0.3 to 10, from the viewpoint of improving foam quality.

[0036] In the present invention, when the liquid composition contains (B2) polyoxyethylene sorbitan fatty acid ester, from the viewpoint of further minimizing the change in color of the composition while maintaining foam quality, the mass ratio (B2) / (C) of component (B2) to component (C) is preferably 0.01 to 6, and more preferably 0.05 to 2.

[0037] Component (D) of the present invention is a colorant selected from Yellow No. 4, Yellow No. 5, Yellow No. 205, Yellow No. 401, Yellow No. 402, Yellow No. 404, Yellow No. 405, Yellow No. 406, and Yellow No. 407. These colorants are azo dyes, and reduce the amount of color change due to light irradiation in the liquid composition of the present invention. Component (D) can be used alone or in combination of two or more types. From the viewpoint of minimizing the amount of change in color of the liquid composition, the content is 0.000001 to 0.001 mass %, preferably 0.000005 to 0.001 mass %, and more preferably 0.00001 to 0.0007 mass % in the liquid composition. Furthermore, from the viewpoints of making the color of the liquid composition before light irradiation natural and improving the initial appearance of the product, the content of component (D) in the liquid composition is preferably 0.0005% by mass or less, more preferably 0.003% by mass or less, and even more preferably 0.0001% by mass or less. The content of component (D) can be analyzed by liquid chromatography / mass spectrometry (LC / MS). In the present invention, the reason why the inclusion of a small amount of component (D) reduces the amount of color change in the composition is not clear in detail, but it is presumed that since the colorant of component (D) has the property of fading relatively easily when exposed to light, there is a good balance between the color change due to component (D) and the color change of the skin cleanser composition, and the amount of color change of the skin cleanser composition is kept extremely small even when exposed to light for a long period of time.

[0038] The liquid skin cleanser of the present invention contains a fragrance (E) in the liquid composition to improve the scent. The fragrance used in the present invention may be a single fragrance component or a fragrance composition containing a plurality of fragrance components. The fragrance component is not particularly limited, and examples of the fragrance component include synthetic fragrances described in "Perfume and Flavor Chemicals" edited by Steffen Arctander, Montclair, NJ (USA) (1969), "Synthetic Fragrances - Chemistry and Product Knowledge" edited by the Synthetic Fragrances Editorial Committee (The Chemical Daily, December 20, 2016, revised and expanded edition), and "Basic Knowledge of Fragrances and Fragrances" edited by Nakajima Mototaka, Sangyo Tosho (first edition, 1995), as well as natural fragrances such as plant extracts.

[0039] From the viewpoint of improving the fragrance, the content of component (E) in the liquid composition is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.05% by mass or more. From the viewpoint of suppressing discoloration due to long-term exposure to light, the content of component (E) in the liquid composition is preferably 1% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.5% by mass or less. Furthermore, from the viewpoint of preventing discoloration due to exposure to light for a long period of time, it is preferable that the fragrance does not contain a large amount of plant extract; specifically, the content of plant extract in the liquid composition is preferably less than 0.001% by mass, more preferably 0.0008% by mass or less, even more preferably 0.0005% by mass or less, and even more preferably none.

[0040] In the present invention, from the viewpoints of improving the fragrance of the skin cleansing agent while further reducing the amount of change in color of the composition, the mass ratio (E) / (D) of component (E) to component (D) is preferably 15 to 900,000, more preferably 20 to 300,000, and even more preferably 200 to 70,000.

[0041] In the present invention, from the viewpoints of improving the fragrance and foam quality of the skin cleanser while further reducing the amount of change in color of the composition, the mass ratio of the total amount of components (B) and (E) to component (D), ((B)+(E)) / (D), is preferably 3,000 to 2,500,000, more preferably 10,000 to 500,000, and even more preferably 20,000 to 200,000.

[0042] In the present invention, the liquid composition may contain surfactants other than components (A) and (B), but from the viewpoint of suppressing discoloration caused by exposure of the skin cleanser to light, the content of alkylamine oxide is preferably low. The content of alkylamine oxide in the liquid composition is preferably less than 3% by mass, more preferably 1% by mass or less, and even more preferably no alkylamine oxide is contained.

[0043] In the present invention, from the viewpoint of suppressing discoloration caused by exposure of the skin cleansing agent to light, the content of the cationic polymer in the liquid composition is preferably small, and the content of the cationic polymer in the liquid composition is preferably 1% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.1% by mass or less, and even more preferably no cationic polymer is contained.

[0044] In the present invention, the liquid composition may contain, in addition to the above-mentioned components, components used in normal cleaning compositions within the scope of not impairing the effects of the present invention. For example, surfactants other than those mentioned above; lower alcohols such as ethanol and isopropyl alcohol; aromatic alcohols such as benzyl alcohol and benzyloxyethanol; cellosolves such as ethyl cellosolve and butyl cellosolve; carbitols such as ethyl carbitol and butyl carbitol; moisturizing components such as sugar (derivatives), amino acid (derivatives), animal and plant (protein) derivatives, and animal and plant extracts; silicone derivatives such as polyoxyalkylene-modified silicone; inorganic or organic salts such as sodium sulfate, sodium carbonate, sodium bicarbonate, potassium chloride, sodium chloride, and sodium citrate; pH adjusters such as acids and alkalis; anti-inflammatory agents such as glycyrrhetic acid, glycyrrhizic acid and derivatives thereof; bactericides such as isopropylmethylphenol; preservatives, sequestering agents, antioxidants, ultraviolet absorbers, anionic polymers, nonionic polymers, amphoteric polymers, fragrances, thickeners, vitamins, natural dyes, tar dyes, and other colorants.

[0045] In the present invention, the liquid composition is in the form of a liquid in which the above-mentioned components are dissolved in water. The content of water is the balance of the above components and other components that are contained as necessary, and is preferably 40 to 75 mass %, more preferably 45 to 70 mass %, and even more preferably 50 to 65 mass % in the liquid composition.

[0046] In the present invention, it is preferable that the liquid composition is not excessively colored from the viewpoint of the beauty of the appearance. Here, the liquid composition in the present invention refers to one having a Hazen color number of preferably 100 or less, more preferably 75 or less, even more preferably 50 or less, and 0 or more. The Hazen color number is a value obtained according to the method defined in JIS K0071-1:2017.

[0047] In the present invention, the liquid composition is preferably transparent. Here, transparency means that the transmittance at a wavelength of 600 nm is 10% or more, preferably 40% or more, more preferably 70% or more, and 100% or less. The transmittance can be measured by the measurement method described in the examples below.

[0048] The liquid skin cleansing agent of the present invention is prepared by filling the liquid composition obtained as described above into a transparent container. The container is preferably a foamer container that is mixed with air and discharged as foam, particularly a non-gas foamer container. When filling the foamer container, the viscosity of the liquid composition at 30°C is preferably 1 to 20 mPa·s, more preferably 2 to 15 mPa·s, even more preferably 3 to 13 mPa·s, and even more preferably 5 to 11 mPa·s, from the viewpoint of forming a fine, thick foam and the composition is in a liquid state before filling the container. In the present invention, the viscosity is measured at 30° C. using a Brookfield viscometer (Toki Sangyo, TVB-10) with rotor No. 1 rotating at a rotation speed of 60 r / min, and the viscosity is measured 60 seconds after the start of rotation. Even with a liquid composition having such a low viscosity, discoloration is sufficiently suppressed, and a cleaning agent having excellent foam quality and foaming properties can be realized.

[0049] The liquid composition is filled in a transparent container. In the present invention, the term "transparent" in the context of a transparent container means that it is transparent to visible light, specifically, that the transmittance at 600 nm is 10% or more, preferably 40% or more, more preferably 70% or more, and 100% or less. The transmittance of visible light can be measured in accordance with JISK7375:2008. In the present invention, a transparent container means that at least the upper 30% of the container is "transparent" as described above, it is more preferable that the upper half of the container is transparent, and it is even more preferable that the entire container is transparent.

[0050] Any foamer container can be used as long as it can be mixed with air and discharged as foam, for example, a pump foamer container that discharges by pressing a pump head, or a squeeze foamer container that discharges by pressing a body part, specifically, foamer containers manufactured by Yoshino Kogyosho Co., Ltd., Yamato Can Co., Ltd., and Rieke Co., Ltd. Also, for example, foamer containers described in JP-A-7-315463, JP-A-8-230961, JP-A-2005-193972, etc. can be used. Among them, from the viewpoint of convenience in the environment in which the liquid detergent is used, a pump foamer container that discharges by pressing a pump head is preferred, and from the viewpoint of further improving the foam quality, a container equipped with a porous membrane filter in the discharge flow path is preferred. From the viewpoint of obtaining finer and better foam quality, such a porous membrane filter is preferably a filter of 50 to 500 mesh, more preferably a filter of 100 to 400 mesh, even more preferably a filter of 200 to 400 mesh, and even more preferably a filter of 200 to 305 mesh. It is preferred that one to three such porous filters are disposed in the discharge flow path. In addition, examples of preferred materials for the mesh of such filters include nylon and polyester. The mixture ratio of the liquid composition and air in the pump foamer container is set to 0.03 to 0.14 g / cm so that the density of the discharged foam (mass of liquid composition / volume of air) is good and the foam quality is easy to wash the skin. 3 It is preferable that the density is 0.05 to 0.11 g / cm 3 is more preferred.

[0051] The liquid skin cleansing agent of the present invention is preferably used for skin cleansing, and more preferably used as hand soap, face wash, or body soap.The liquid skin cleansing agent of the present invention can be used to cleanse the skin by a general skin cleansing method.For example, when filled in a foamer container, the foam discharged from the container can be taken by hand, directly applied to the skin without diluting with water, foamed and cleansed, and then rinsed with warm water such as a shower. The washing method may be by hand or by using a sponge, towel, scrubbing brush, etc. made of chemical fibers such as cotton or nylon. To reduce irritation to the skin, the product may be directly washed by hand, or from the viewpoint of effectively and fully exerting the foaming performance and usability of the present invention, it may be washed with a soft cotton towel, etc. EXAMPLES

[0052] Examples 1 to 33, Comparative Examples 1 to 2 Liquid compositions having the compositions shown in Tables 1 to 4 were produced by mixing and dissolving each component in water, and the pH was adjusted to 6.2 with citric acid. (The numbers in the tables for the blend amounts indicate the blend amounts of the raw materials unless otherwise specified.) The obtained liquid compositions were placed in a cell with an optical path length of 10 mm, and the transmittance at a wavelength of 600 nm was measured using a photoelectric colorimeter AP-120 (manufactured by APEL Co., Ltd.). The transmittance of each composition was 70% or more (the transmittance (%) at 600 nm is shown in the table). The viscosity of the liquid compositions at 30°C was measured using a Brookfield viscometer (Toki Sangyo, TVB-10) with rotor No. 1 and a rotation speed of 60 r / min. The results are shown in Tables 1 to 4. The obtained liquid composition was filled into a pump former container (a transparent pump former container manufactured by Yoshino Kogyosho Co., Ltd. (the mesh sizes of the porous membrane filters installed in the discharge path are two 200 mesh filters and one 305 mesh filter); a container with a transmittance of 90% at 600 nm) to obtain a liquid skin cleanser in a transparent former container. The obtained liquid skin cleansing agents in transparent foam containers were stored in their containers at 50° C. for one month or exposed to light, and the change in Hazen color index before and after storage was measured. The results are shown in Tables 1 to 4. The exposure storage was performed by irradiating the samples with light for 240 hours using a Weatherometer Ci4000 (manufactured by Atlas Co., Ltd.). In addition, the Hazen color index was calculated by placing each composition in a measurement cell (optical path length 50 mm) and using a spectrophotometer TZ7700 (manufactured by Nippon Denshoku Industries Co., Ltd.) according to the method of JIS K0071-1:2017.

[0053] [Table 1]

[0054] [Table 2]

[0055] [Table 3]

[0056] [Table 4]

[0057] Furthermore, the foam quality (ease of spreading foam, foam thickness) and foaming were evaluated for the liquid skin cleansing agents in the transparent foamer containers of the Examples shown in Table 5. The evaluation results are shown in Table 5.

[0058] (Evaluation method) (1) Ease of spreading foam: Five expert panelists wet both arms with water, dispensed 1mL of foam onto the palm of one hand, pressed it against the other forearm and massaged it. The panelists evaluated whether the foam felt smooth and easy to spread, based on the following criteria. The results are shown as the average score of the five panelists. 4 points: The foam is slippery. 3 points: The foam is slightly slippery. 2 points: The foam is slightly non-slip. 1 point: The foam is not slippery.

[0059] (2) Foam thickness: Five expert panelists wet both arms with water, dispensed 1mL of foam onto the palm of one hand, pressed it against the other forearm and massaged it. The thickness of the foam felt (presence) was evaluated according to the following criteria. The results are shown as the average score of the five panelists. 4 points: Thick. 3 points: Somewhat thick. 2 points: Somewhat thin. 1 point: No thickness.

[0060] (3) Foaming: Five expert panelists wet both arms with water, dispensed a foam (volume: 1 mL) onto the palm of one hand, and spread it on the other forearm. The panelists assessed whether they felt the foam increase in proportion to the number of times they rubbed the hands together, using the following criteria. The results are shown as the average score of the five panelists. 4 points: I feel like the bubbles are increasing. 3 points: It feels like the bubbles are increasing slightly. 2 points: It feels like the foam isn't increasing much. 1 point: I feel like the bubbles aren't increasing

[0061] [Table 5]

Claims

1. The following components (A), (B), (C), (D) and (E): (A) one or more anionic surfactants selected from polyoxyalkylene alkyl ether carboxylic acids or salts thereof, polyoxyalkylene alkyl ether sulfates, and acylated amino acids or salts thereof; (B) a nonionic surfactant having a sugar skeleton, less than 3% by mass; (C) a polyhydric alcohol, (D) 0.000001 to 0.001% by mass of a colorant selected from Yellow No. 4, Yellow No. 5, Yellow No. 205, Yellow No. 401, Yellow No. 402, Yellow No. 404, Yellow No. 405, Yellow No. 406, and Yellow No. 407, (E) Fragrance The liquid skin cleansing agent is obtained by filling a transparent container with a liquid composition containing the above.

2. 2. The liquid skin cleansing agent according to claim 1, wherein the content of the alkyl glucoside (B1) in the liquid composition is 1.5 mass% or less.

3. 3. The liquid skin cleansing agent according to claim 1, wherein the content of the alkanolamine salt of component (A) in the liquid composition is less than 0.1% by mass.

4. The liquid skin cleansing agent according to any one of claims 1 to 3, wherein the content of the alkylamine oxide in the liquid composition is less than 3 mass%.

5. The liquid skin cleansing agent according to any one of claims 1 to 4, wherein the mass ratio (E) / (D) of component (E) to component (D) is 15 to 900,000.

6. The liquid skin cleansing agent according to any one of claims 1 to 5, wherein the liquid composition has a transmittance of 10 to 100% at a wavelength of 600 nm.

7. The liquid skin cleansing agent according to any one of claims 1 to 6, wherein the content of (C1) glycerin in the liquid composition is 0.5 to 20 mass%.

8. The liquid skin cleansing agent according to any one of claims 1 to 7, wherein the mass ratio (A) / (C) of component (A) to component (C) is 0.1 to 40.

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