Liquid skin cleansing composition

Abstract

To provide a liquid skin cleansing composition that is superior in foaming durability and foam break-off at the discharge port.SOLUTION: A liquid skin cleansing composition comprises: (A) an anionic surfactant; (B) one or more salts selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate; (C) a bactericide having an aromatic ring; and (D) a chelating agent, wherein the content of the component (B) is 0.5 mass% or more and 4 mass% or less based on the total amount of the liquid skin cleansing composition, and wherein the composition is packaged in a foamer container having a downward-facing discharge port.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Conventionally, as liquid skin cleansing compositions such as body soap, for example, for the purpose of improving the usability (such as the moist feeling on the skin after towel drying and the lack of stickiness), the dischargeability from the former container, and the foam performance (the speed and density of foaming), a liquid skin cleansing composition containing an anionic surfactant, a cationic polymer, and a potassium phosphate salt in a specific ratio has been proposed (see, for example, Patent Document 1).

[0003] However, when a skin cleansing composition with good foaming, such as the conventional liquid skin cleansing composition including Patent Document 1, is filled into a former container having a discharge port downward and used, the foam breakage from the discharge port may deteriorate, and there are concerns such as a decrease in the discharge amount and dirt on the former container body due to this.

[0004] Therefore, it is desired to provide a liquid skin cleansing composition excellent in foaming and foam breakage from the discharge port.

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-mentioned various problems in the prior art and achieve the following object. That is, an object of the present invention is to provide a liquid skin cleansing composition excellent in foaming and foam breakage from the discharge port.

Means for Solving the Problems

[0007] The liquid skin cleansing composition of the present invention contains (A) an anionic surfactant, (B) one or more salts selected from dihydrogen phosphates, hydrogen phosphates, phosphates, tripolyphosphates, polyphosphates, and pyrophosphates, (C) a bactericide having an aromatic ring, and (D) a chelating agent. The content of the component (B) is 0.5% by mass or more and 4% by mass or less based on the total amount of the liquid skin cleansing composition, and it is filled in a former container having a discharge port downward.

[0008] The present invention is based on the findings of the present inventor, and the means for solving the above problems are as follows. That is, <1> (A) an anionic surfactant, (B) one or more salts selected from dihydrogen phosphates, hydrogen phosphates, phosphates, tripolyphosphates, polyphosphates, and pyrophosphates, (C) a bactericide having an aromatic ring, (D) a chelating agent, and is a liquid skin cleansing composition, wherein the content of the component (B) is 0.5% by mass or more and 4% by mass or less based on the total amount of the liquid skin cleansing composition, and it is characterized in that it is filled in a former container having a discharge port downward. <2> The liquid skin cleansing composition according to <1> above, wherein the mass ratio [(B) / {(C)+(D)}] of the content of the component (B) to the total content of the components (C) and (D) is 2 or more and 23 or less. <3> The content of the component (A) is 3% by mass or more and 10% by mass or less based on the total amount of the liquid skin cleansing composition, the content of the component (B) is 1% by mass or more and 3.5% by mass or less based on the total amount of the liquid skin cleansing composition, the content of the component (C) is 0.05% by mass or more and 0.5% by mass or less based on the total amount of the liquid skin cleansing composition, The content of the component (D) is 0.05% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition, and it is the liquid skin cleansing composition according to <1> or <2> above.

Advantages of the Invention

[0009] According to the present invention, it is possible to provide a liquid skin cleansing composition excellent in foam retention and foam breakage from the discharge port.

Brief Description of the Drawings

[0010]

Figure 1

Embodiments for Carrying Out the Invention

[0011] (Liquid Skin Cleansing Composition) The liquid skin cleansing composition of the present invention contains (A) an anionic surfactant, (B) one or more salts selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate, (C) a bactericide having an aromatic ring, and (D) a chelating agent, and may contain other components as necessary. In this specification, the “(A) anionic surfactant” may be referred to as “(A)” or “component (A)”, the “(B) one or more salts selected from dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate” may be referred to as “(B)” or “component (B)”, the “(C) bactericide having an aromatic ring” may be referred to as “(C)” or “component (C)”, and the “(D) chelating agent” may be referred to as “(D)” or “component (D)”.

[0012] <(A) Anionic Surfactant> The component (A) imparts good foam retention to the liquid skin cleansing composition.

[0013] The component (A) is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include higher fatty acid salts, polyoxyethylene alkyl ether sulfates, ether carboxylic acids or their salts, etc. Among these, from the viewpoint of good foaming property, higher fatty acid salts are preferred. These may be used alone or in combination of two or more.

[0014] -Higher fatty acid salt- The higher fatty acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include laurate, myristate, palmitate, stearate, etc.

[0015] The counter ion in the higher fatty acid salt 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, etc. The alkali metal ion is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include sodium ion, potassium ion, etc. The alkanolamine is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include monoethanolamine, diethanolamine, triethanolamine, etc. The basic amino acid is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include lysine, arginine, etc.

[0016] The higher fatty acid salt can be blended as a higher fatty acid salt, but the higher fatty acid and the salt serving as the counter ion (such as potassium hydroxide, triethanolamine, monoethanolamine, etc.) may be separately added to the blending tank and subjected to a neutralization reaction to obtain a higher fatty acid salt.

[0017] For the higher fatty acid used in the preparation of the higher fatty acid salt, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the higher 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.

[0018] For the higher fatty acid salt, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the higher fatty acid salt include, for example, under the trade name, NIKKOL Potassium Laurate LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL Potassium Myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), Non-Sal PK-1 (potassium palmitate, manufactured by NOF Corporation), Non-Sal SK-1 (potassium stearate, manufactured by NOF Corporation), Tyson Soap MNK-40 (liquid mixture of potassium coconut fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), and the like.

[0019] - Polyoxyethylene (POE) alkyl ether sulfate There are no particular restrictions on the polyoxyethylene alkyl ether sulfate, and it can be appropriately selected according to the purpose. Examples thereof include compounds represented by the following general formula (A1). The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more.

[0020]

Chemical formula

[0021] In the general formula (A1), R 1 represents an alkyl group. The number of carbon atoms in the alkyl group part is preferably 10 to 14. In the general formula (A1), n represents the average number of moles of ethylene oxide (E.O.) added. The average number of moles of ethylene oxide added is preferably 1 to 5. In the general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected according to the purpose. Examples thereof include sodium and potassium.

[0022] Specific examples of the polyoxyethylene alkyl ether sulfate include sodium polyoxyethylene (1) lauryl ether sulfate, sodium polyoxyethylene (2) lauryl ether sulfate (alias: POE(2) lauryl sulfate sodium), sodium polyoxyethylene (3) lauryl ether sulfate (alias: POE(3) lauryl sulfate sodium), sodium polyoxyethylene (4) lauryl ether sulfate, sodium polyoxyethylene (5) lauryl ether sulfate, sodium polyoxyethylene (3) alkyl (C12,13) ether sulfate, ammonium polyoxyethylene (2) lauryl ether sulfate, ammonium polyoxyethylene (3) lauryl ether sulfate, and the like. Note that the numerical value in the parentheses represents the average number of moles of ethylene oxide (E.O.) added (n).

[0023] The polyoxyethylene alkyl ether sulfate may be a synthesized product or a commercially available product. Examples of commercially available products of the polyoxyethylene alkyl ether sulfate include, by trade name, sodium polyoxyethylene (1) lauryl ether sulfate (trade name: Emal 125A, manufactured by Kao Corporation), sodium polyoxyethylene (2) lauryl ether sulfate (manufactured by Shin Nippon Rika Co., Ltd.), sodium polyoxyethylene (3) lauryl ether sulfate (trade name: Emal 20C, manufactured by Kao Corporation), ammonium polyoxyethylene (1) lauryl ether sulfate (manufactured by Kao Corporation), ammonium polyoxyethylene (3) lauryl ether sulfate (manufactured by Teika Corporation), and the like.

[0024] - Ether carboxylic acid or its salt - The ether carboxylic acid or its salt is not particularly limited and can be appropriately selected according to the purpose. Examples include compounds represented by the following general formula (A2) or (A3). The ether carboxylic acid or its salt may be used alone or in combination of two or more.

[0025] [Chemical formula]

[0026] In the general formulas (A2) and (A3), R 2 represents a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms. The number of carbon atoms in the R 2 portion is preferably 10 to 14. In the general formula (A2), R 3 may be the same or different and represents an alkylene group having 2 to 4 carbon atoms, preferably an alkylene group having 2 carbon atoms. In the general formula (A2), o represents the average number of moles of alkylene oxide added, and the average number of moles of alkylene oxide added is preferably 1 to 5. In the general formulas (A2) and (A3), M 1 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid. Among these, from the viewpoint of good foaming properties, polyoxyalkylene alkyl ether carboxylic acid or its salt is preferable. As the polyoxyalkylene alkyl ether carboxylic acid or its salt, polyoxyethylene (POE) alkyl ether acetic acid or its salt is preferable.

[0027] Specific examples of the ether carboxylic acid represented by the general formula (A2) or (A3) or a salt thereof include sodium polyoxyethylene (3) lauryl ether acetate, potassium polyoxyethylene (4) lauryl ether acetate, sodium lauryl glycol acetate, and the like. The numerical value within the parentheses represents the average number of moles (o) of alkylene oxide added.

[0028] As the ether carboxylic acid or a salt thereof, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the ether carboxylic acid or a salt thereof include, for example, under the trade names, Enacol EC-30 (sodium polyoxyethylene (3) lauryl ether acetate, manufactured by Lion Specialty Chemicals Co., Ltd.), Viewlite LCA-25F (sodium polyoxyethylene (3) lauryl ether acetate), Viewlite LCA-30D (sodium polyoxyethylene (3) lauryl ether 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 (sodium polyoxyethylene (3) lauryl ether acetate) (all of the above are manufactured by Sanyo Chemical Industries, Ltd.), Kao Akipo RLM-45NV (sodium polyoxyethylene (4.5) lauryl ether acetate), Kao Akipo RLM-100NV (sodium polyoxyethylene (10) lauryl ether acetate) (all of the above are manufactured by Kao Corporation), and the like. The numerical value within the parentheses represents the average number of moles (o) of alkylene oxide added.

[0029] The content of the component (A) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of foam retention, low-temperature stability, and good foam breakage during discharge, it is preferably 1.0% by mass or more and 25% by mass or less, more preferably 3.0% 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 1.0% 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 (A) is 25% by mass or less based on the total amount of the liquid skin cleansing composition, the low-temperature stability and the foam breakage during discharge are good.

[0030] <One or more salts selected from (B) dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate> The component (B) imparts good foaming property and good foam breakage during discharge to the liquid skin cleansing composition.

[0031] There is no particular limitation on the component (B), and it can be appropriately selected according to the purpose. From the viewpoint of good foaming property and good foam breakage during discharge, dihydrogen phosphate, hydrogen phosphate, phosphate, tripolyphosphate, polyphosphate, and pyrophosphate are preferable, and dihydrogen phosphate, hydrogen phosphate, tripolyphosphate, and polyphosphate are more preferable.

[0032] Examples of the dihydrogen phosphate include potassium dihydrogen phosphate and sodium dihydrogen phosphate. Examples of the hydrogen phosphate include dipotassium hydrogen phosphate and disodium hydrogen phosphate. Examples of the phosphate include sodium phosphate and tripotassium phosphate. Examples of the tripolyphosphate include potassium tripolyphosphate and sodium tripolyphosphate. Examples of the polyphosphate include potassium polyphosphate and sodium polyphosphate. Examples of the pyrophosphate include sodium pyrophosphate and potassium pyrophosphate. Among these, from the viewpoint of good foaming property and good foam breakage during discharge, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate, and potassium polyphosphate are preferable.

[0033] For the component (B), those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the component (B) 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 Corporation), potassium pyrophosphate (manufactured by Yoneyama Chemical Industry Co., Ltd.), and the like.

[0034] In the liquid skin cleansing composition of the present invention, the content of the component (B) is 0.5% by mass or more and 4% by mass or less based on the total amount of the liquid skin cleansing composition. Further, from the viewpoints of good foam retention, low-temperature stability, and good foam breakage during discharge, the content of the component (B) is preferably 1.0% by mass or more and 3.5% by mass or less based on the total amount of the liquid skin cleansing composition. When the content of the component (B) is 0.5% by mass or more based on the total amount of the liquid skin cleansing composition, the foam retention and the foam breakage during discharge are good. When the content of the component (B) is 4.0% by mass or less based on the total amount of the liquid skin cleansing composition, the low-temperature stability is good.

[0035] <(C) Bactericide having an aromatic ring> The component (C) imparts good foam breakage during discharge to the liquid skin cleansing composition.

[0036] The component (C) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good foam breakage during discharge, isopropylmethylphenol and salicylic acid are preferred, and isopropylmethylphenol is more preferred.

[0037] For the component (C), those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the component (C) include, for example, isopropylmethylphenol (manufactured by Osaka Chemical Co., Ltd.) and salicylic acid (manufactured by API Corporation) under their respective trade names.

[0038] The content of the component (C) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good foam breakage during discharge, it is preferably 0.02% by mass or more and 1.0% by mass or less, more preferably 0.05% by mass or more and 0.5% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (C) is 0.02% by mass or more based on the total amount of the liquid skin cleansing composition, the foam breakage during discharge is good. When the content of the component (C) is 1.0% by mass or less based on the total amount of the liquid skin cleansing composition, the foam breakage during discharge is good.

[0039] <(D) Chelating agent> The component (D) imparts good foam retention and good foam breakage during discharge to the liquid skin cleansing composition.

[0040] The component (D) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of good foam retention and good foam breakage during discharge, edetic acid or its salts, citric acid or its salts, gluconic acid or its salts, methylglycine diacetate (MGDA), and glutamic acid diacetate (GLDA) are preferred, and edetic acid or its salts are more preferred.

[0041] Examples of the edetic acid or its salts include edetic acid, disodium edetate, trisodium edetate, and tetrasodium edetate. Examples of the citric acid or its salts include citric acid and sodium citrate. Examples of the gluconic acid or its salts include gluconic acid. Examples of the methylglycine diacetate include trisodium methylglycine diacetate. Examples of the glutamic acid diacetate include sodium glutamate diacetate tetrasodium.

[0042] As the component (D), those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the component (D) include, for example, under the trade names, Disorbine Z (ethylenediaminetetraacetic acid, manufactured by Lion Specialty Chemicals Co., Ltd.), Disorbine NA2-S (disodium ethylenediaminetetraacetate, manufactured by Lion Specialty Chemicals Co., Ltd.), Krest 2C-SD (trisodium ethylenediaminetetraacetate, manufactured by Krest Co., Ltd.), Disorbine NA-X (tetrasodium ethylenediaminetetraacetate, manufactured by Lion Specialty Chemicals Co., Ltd.), citric acid (citric acid, manufactured by Komatsuya Co., Ltd.), sodium citrate (sodium citrate, manufactured by Komatsuya Co., Ltd.), 50% gluconic acid solution (gluconic acid, manufactured by Fujifilm Wako Pure Chemical Corporation), Neutrol (registered trademark) MGDA (trisodium methylglycine diacetate, manufactured by BASF), Krest CMG-40 (tetrasodium glutamate diacetate, manufactured by Krest Co., Ltd.), and the like.

[0043] The content of the component (D) is not particularly limited and can be appropriately selected according to the purpose. However, from the viewpoints of foaming property, low-temperature stability, and good foam breakage during discharge, it is preferably 0.02% by mass or more and 1.5% by mass or less, more preferably 0.05% by mass or more and 1.0% by mass or less, based on the total amount of the liquid skin cleansing composition. When the content of the component (D) is 0.02% by mass or more based on the total amount of the liquid skin cleansing composition, the foaming property and the foam breakage during discharge are good. When the content of the component (D) is 1.5% by mass or less based on the total amount of the liquid skin cleansing composition, the low-temperature stability and the foam breakage during discharge are good.

[0044] <Mass ratio [(B) / {(C)+(D)}]> In the liquid skin cleansing composition of the present invention, the mass ratio [(B) / {(C)+(D)}] of the content of the component (B) to the total content of the component (C) and the component (D) is preferably 1.5 or more and 25 or less, more preferably 2.0 or more and 23 or less, from the viewpoint of good foam collapse during discharge. When the mass ratio [(B) / {(C)+(D)}] is 1.5 or more, the foam collapse during discharge becomes good. When the mass ratio [(B) / {(C)+(D)}] is 25 or less, the foam collapse during discharge becomes good.

[0045] <Other components> In addition to the components (A), (B), (C), and (D) in the liquid skin cleansing composition, 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 component (A), water-soluble polymers, oils, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, amino acids, drugs such as vitamins, bactericides other than the component (C), moisturizers, preservatives, pH adjusters such as potassium hydroxide, sulfuric acid, hydrochloric acid, antioxidants, sequestering agents, ultraviolet absorbers, ultraviolet scattering agents, animal and plant extracts or their derivatives, chelating agents other than the component (D), pigments, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer compound powders such as nylon and polyethylene. These may be used alone or in combination of two or more. As the other components, those synthesized appropriately may be used, or commercially available products may be used. The content of the other components in the liquid skin cleansing composition is not particularly limited and can be appropriately selected according to the purpose.

[0046] The oil component is not particularly limited and can be appropriately selected according to the purpose. For example, vegetable oils and fats such as castor oil, olive oil, cocoa butter, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grape seed oil, avocado oil, and their ester compounds; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, behenic acid; esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, cholesterol oleate, etc. can be mentioned. These may be used alone or in combination of two or more. The content of the oil component is not particularly limited as long as the effects of the present invention are not impaired, and can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 3% by mass or less based on the total amount of the liquid skin cleansing composition.

[0047] The alcohols are not particularly limited and can be appropriately selected according to the purpose. For example, natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyl decanol, octyldodecanol, lauryl alcohol, etc. can be mentioned. These may be used alone or in combination of two or more. The content of the alcohols is not particularly limited as long as the effects of the present invention are not impaired, and can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass or more and 10% by mass or less based on the total amount of the liquid skin cleansing composition.

[0048] The humectant is not particularly limited and can be appropriately selected according to the purpose. For example, isoprene glycol, 1,2 - pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, polyglycerins, etc. can be mentioned. These may be used alone or in combination of two or more.

[0049] The preservative is not particularly limited and can be appropriately selected according to the purpose. For example, benzoate, sorbate, dehydroacetate, para - hydroxybenzoate, 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), pentanediol, phenoxyethanol, ethanol, etc. can be mentioned. These may be used alone or in combination of two or more. The content of the preservative is not particularly limited as long as the effects of the present invention are not impaired and can be appropriately selected according to the purpose. However, 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.

[0050] The antioxidant is not particularly limited and can be appropriately selected according to the purpose. For example, dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, etc. can be mentioned. These may be used alone or in combination of two or more. The content of the antioxidant is not particularly limited as long as the effects of the present invention are not impaired and can be appropriately selected according to the purpose. However, 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.

[0051] The pH adjuster is not particularly limited and can be appropriately selected according to the purpose. For example, sodium hydroxide, potassium hydroxide, sulfuric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, etc. can be mentioned. These may be used alone or in combination of two or more.

[0052] 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-methoxysalicylate, titanium oxide, kaolin, talc, etc. can be mentioned. These may be used alone or in combination of two or more.

[0053] The vitamins are not particularly limited and can be appropriately selected according to the purpose. For example, vitamin A, vitamin B group, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid and its derivatives, etc. can be mentioned. These may be used alone or in combination of two or more. The content of the vitamins is not particularly limited as long as the effects of the present invention are not impaired and 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.

[0054] 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 its derivatives, etc. These may be used alone or in combination of two or more. The content of the amino acids is not particularly limited as long as the effects of the present invention are not impaired, and can be appropriately selected according to the purpose. However, it is preferably 0.001% by mass or more and 0.5% by mass or less based on the total amount of the liquid skin cleansing composition.

[0055] The fragrance is not particularly limited and can be appropriately selected according to the purpose. For example, fragrance compositions A to D described in paragraphs

[0065] to

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

[0076] to

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

[0016] to

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

[0056] -pH- The pH of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected according to the purpose. However, it is preferably 9.5 or more and 11.0 or less, and more preferably 9.8 or more and 10.6 or less. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by Toa DK Kogyo Co., Ltd., electrode type GST-5721).

[0057] -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 20 mPa·s or less, and more preferably 3 mPa·s or more and 10 mPa·s or less. The method for measuring the viscosity is not particularly limited. For example, a method of measuring the viscosity after 1 minute at a sample temperature of 25°C, a rotation speed of 60 rpm, and using a No. 1 rotor using a BM viscometer (manufactured by Tokyo Keiki Co., Ltd.) can be mentioned.

[0058] -Foamer container- The liquid skin cleansing composition of the present invention is filled in a foamer container having a discharge port downward. As the former container, there is no particular limitation as long as it can mix the skin cleansing agent composition with air and discharge it downward in a foamed state, and it can be appropriately selected according to the purpose. For example, a pump former container capable of discharging foam by pressing down the nozzle part, a dispenser that automatically discharges foam (for example, the former container 1 having a power supply 2, a sensor 3, and a discharge port 4 shown in FIG. 1), and other non-gas type foam discharge containers can be mentioned.

[0059] The non-gas type foam discharge container usually has a porous membrane body for forming foam, and foam is formed when the liquid skin cleansing agent composition passes through the porous membrane body. As the material of the porous membrane body, there is no particular limitation and it can be appropriately selected according to the purpose, but plastic materials such as nylon, polyester, and polyolefin are preferred.

[0060] As the mesh of the porous membrane body, there is no particular limitation and it can be appropriately selected according to the purpose, but 100 mesh or more is preferred, 100 mesh to 400 mesh is more preferred, and 200 mesh to 305 mesh is even more preferred. Also, as the number of the porous membrane bodies, there is no particular limitation and it can be appropriately selected according to the purpose, but from the viewpoint of improving foam performance, 2 to 4 sheets are preferred.

[0061] -Manufacturing method- As the manufacturing method of the liquid skin cleansing agent composition of the present invention, there is no particular limitation and it can be appropriately selected according to the purpose. For example, it can be obtained by mixing the component (A), the component (B), the component (C), and the component (D), and if necessary, the other components, and purified water (formulated as the remaining amount so that the whole liquid skin cleansing agent composition becomes 100% by mass). Specifically, it can be manufactured as follows. Using purified water, propylene glycol, etc., which are other components, a mixture is prepared in an amount that makes up 60% by mass of the total amount of the finally obtained liquid skin cleansing composition. After heating the mixture to 70°C to 80°C, it can be manufactured by dissolving component (A), component (B), component (C), component (D), and potassium hydroxide and monoethanolamine, which are other components.

[0062] 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.

[0063] - 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 the normal method of use.

[0064] 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

[0065] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples in any way. The content of each component described in the Examples and Comparative Examples is shown in "mass%", the total amount is 100 mass%, and all are values in terms of pure components.

[0066] (Examples 1 to 23 and Comparative Examples 1 to 6) The liquid skin cleansing agent compositions with the compositions and contents shown in Examples 1 to 23 and Comparative Examples 1 to 6 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 be 60% by mass of the total amount of the finally obtained liquid skin cleansing agent composition. After heating the mixture to 70°C to 80°C, the components (A), (B), (C), (D), and other components such as potassium hydroxide and monoethanolamine were dissolved. If the predetermined pH was not reached, potassium hydroxide, which is another component, was added to adjust the pH to 10.0, and then purified water was added so that the total amount became 100% by mass, thereby obtaining each liquid skin cleansing agent composition. Also, for the mixing of each component, a propeller was used as the stirring blade, and stirring was performed using a three - one motor (HEIDON BL1200, manufactured by Shinto Kagaku Co., Ltd.). Note that the pH was measured at 25°C using a pH meter (HM - 30R, manufactured by TOA DKK). Note that the viscosity was measured at 25°C using a BM - type viscometer (manufactured by Tokyo Keiki Co., Ltd.) after maintaining a constant temperature at 25°C, using a rotor of spindle No. 1 at a rotation speed of 60 revolutions per minute for 1 minute. Also, the obtained liquid skin cleansing agent compositions of Examples 1 to 23 and Comparative Examples 1 to 6 were filled into a Lion Corporation foaming hand soap automatic dispenser as shown in Figure 1.

[0067] For each liquid skin cleansing agent composition, "foam break - off from the spout", "foam retention", and "low - temperature stability" were evaluated and determined as follows. The results are shown in Tables 1 to 4 below.

[0068] <Evaluation of foam break - off from the spout> After discharging each liquid skin cleansing agent composition once (about 1.5 g), the foam break - off from the spout was evaluated based on the following evaluation criteria. The results were obtained by calculating the average score value when performed 10 times, and the determination was made based on the following determination criteria for the average score value. - Evaluation criteria - 4 points: The foam break - off from the spout is very good 3 points: The foam break - off from the spout is somewhat good 2 points: The foam breakage from the discharge port is not very good. 1 point: The foam breakage from the discharge port is very poor. - Judgment criteria - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0069] <Evaluation of foaming> To 10 professional evaluators, each liquid skin cleansing agent composition of about 1.5 g (for one use) was discharged. Regarding the "foaming" when rubbing the palms of both hands 5 times back and forth and the backs of both hands 10 times back and forth at a speed of once per second, evaluation was carried out based on the following evaluation criteria. The results were obtained by calculating the average score of the 10 professional evaluators and judged based on the following judgment criteria for the average score. - Evaluation criteria - 4 points: The foam covers 80% or more of the hand. 3 points: The foam covers more than 50% and less than 80% of the hand. 2 points: The foam covers more than 30% and less than 50% of the hand. 1 point: The foam covers less than 30% of the hand. - Judgment criteria - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0070] <Evaluation of low-temperature stability> Each liquid skin cleansing agent composition was stored at -5°C for 2 months, then returned to room temperature and visually observed. The presence or absence of precipitates and aggregates was evaluated based on the following evaluation criteria. The results were obtained by calculating the average score of 10 implementations and judged based on the following judgment criteria for the average score. - Evaluation criteria - 4 points: No precipitates or aggregates are visible. 3 points: Almost no precipitates or aggregates are visible. 2 points: Precipitates or aggregates can be confirmed. 1 point: Precipitates or aggregates can be significantly confirmed. -Judgment Criteria- ◎: 3.5 or more and 4.0 or less points ○: 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

[0071]

Table 1

[0072]

Table 2

[0073]

Table 3

[0074]

Table 4

[0075] Details of each component used in Examples 1 to 23 and Comparative Examples 1 to 6 are shown in Table 5 below.

[0076]

Table 5

Industrial Applicability

[0077] Since the liquid skin cleansing composition is excellent in foaming and foam breakage from the discharge port, it can be used, for example, in body shampoos, body soaps, facial cleansing foams, foam hand soaps, cleansing foams, makeup removers, etc., and can be preferably used particularly in foam hand soaps.

Explanation of Signs

[0078] 1 Foamer container 2 Power supply 3 Sensor 4 Discharge port

Claims

1. (A) an anionic surfactant; (B) at least one salt selected from dihydrogen phosphate salts, hydrogen phosphate salts, phosphate salts, tripolyphosphate salts, polyphosphate salts, and pyrophosphate salts; (C) a bactericide having an aromatic ring; (D) a chelating agent, and a liquid skin cleansing composition containing the same, wherein the content of the component (B) is 0.5% by mass or more and 4% by mass or less based on the total amount of the liquid skin cleansing composition; A liquid skin cleansing composition, characterized in that it is filled in a former container having a discharge port downward.

2. The liquid skin cleansing composition according to claim 1, wherein the mass ratio [(B) / {(C)+(D)}] of the content of the component (B) to the total content of the component (C) and the component (D) is 2 or more and 23 or less.

3. The content of the component (A) is 3% by mass or more and 10% by mass or less based on the total amount of the liquid skin cleansing composition; The content of the component (B) is 1% by mass or more and 3.5% by mass or less based on the total amount of the liquid skin cleansing composition; The content of the component (C) is 0.05% by mass or more and 0.5% by mass or less based on the total amount of the liquid skin cleansing composition; The liquid skin cleansing composition according to claim 1 or 2, wherein the content of the component (D) is 0.05% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition.

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