Cleaning Composition

Abstract

The object of the present invention is to provide a cleaning composition whose properties do not vary much with temperature. [Solution] A cleaning composition is prepared containing (A) a straight-chain fatty acid having 12 to 22 carbon atoms, (B) polyethylene glycol monostearate, and (C) a basic component, where component (A) consists of (A-1) oleic acid and (A-2) a straight-chain fatty acid other than oleic acid having 12 to 22 carbon atoms, and the neutralization rate of component (A) is 90% or more. This cleaning composition may optionally contain (D) at least one member selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide.

Description

[Technical Field]

[0001] The present invention relates to cleaning compositions. [Background technology]

[0002] Various cleansers containing fatty acid soap have been proposed, including a formulation that incorporates polymers such as cationic polygalactomannan or polyethylene glycol into fatty acid soap to provide smoothness and dense foam (Patent Document 1), and a skin cleanser that incorporates fatty acid soap into hydroxypropyl starch phosphate or 2-methacryloyloxyethyl phosphorylcholine-stearyl methacrylate copolymer (Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6254638 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-132646 Summary of the Invention [Problem to be solved by the invention]

[0004] Detergents are required to have long-term physical and chemical stability over the temperature range in which they are generally used. However, achieving this stability is extremely difficult because various components with different solubilities and stabilities are mixed. The object of the present invention is to provide a cleaning composition that can maintain viscosity and other properties over a wide temperature range. [Means for solving the problem]

[0005] Because temperatures in the summer and in bathrooms can be high, it is important for cleaning compositions to maintain their stability even at temperatures around 40°C. Generally, for compositions with a high degree of neutralization using fatty acid soap, it is difficult to increase the viscosity at room temperature (e.g., around 20-25°C). Therefore, attempts to thicken the composition by adding a polymer are possible. However, adding such a polymer makes it difficult to maintain a constant viscosity at room temperature and at relatively high temperatures. A satisfactory solution for maintaining physical properties such as viscosity despite temperature changes has yet to be found.

[0006] The inventors have discovered that by incorporating specific components as fatty acid soaps in which fatty acids are neutralized, a cleaning composition can be obtained that can suppress and maintain changes in physical properties such as viscosity that occur with temperature changes.

[0007] That is, the present invention relates to the following cleaning composition. [1] A cleaning composition comprising the following components (A), (B), and (C): (A) Straight-chain fatty acids with 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; and (C) Contains a basic component, wherein the component (A) comprises (A-1) oleic acid and (A-2) a linear fatty acid having 12 to 22 carbon atoms other than oleic acid; A cleaning composition in which the neutralization rate of component (A) is 90% or more. [2] The cleaning composition according to [1], further comprising (D) at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide. [3] The cleaning composition according to [1] or [2], wherein the component (C) is at least one selected from the group consisting of sodium hydroxide and potassium hydroxide. [4] The cleaning composition according to any one of [1] to [3], wherein the component (A) is contained in an amount of 10.1 to 60 mass % based on the total amount of the composition. [5] The cleansing composition according to any one of [1] to [4], which is a tube-packed facial cleanser. The present invention further relates to the following viscosity maintaining method. [6] (A) Straight-chain fatty acids with 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; and (C) A basic component is present, The method for maintaining the viscosity of a cleaning composition is characterized in that component (A) consists of (A-1) oleic acid and (A-2) a straight-chain fatty acid having 12 to 22 carbon atoms other than oleic acid, and the neutralization rate of component (A) is 90% or more. [Effects of the Invention]

[0008] The cleaning composition of the present invention can maintain physical properties such as viscosity over a wide temperature range. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in detail below.

[0010] In this specification, the unit of content "% by mass" is synonymous with "g / 100g".

[0011] [Cleaning composition] The cleaning composition of the present invention comprises: (A) Straight-chain fatty acids with 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; and (C) Contains a basic component, A cleaning composition having a neutralization rate of 90% or more of component (A), wherein (A) the straight-chain fatty acid having 12 to 22 carbon atoms consists of (A-1) oleic acid and (A-2) a straight-chain fatty acid having 12 to 22 carbon atoms other than oleic acid.

[0012] ((A) Straight-chain fatty acids with 12 to 22 carbon atoms) (A) The straight-chain fatty acid having 12 to 22 carbon atoms comprises (A-1) oleic acid and (A-2) a straight-chain fatty acid other than oleic acid having 12 to 22 carbon atoms. That is, the component (A) necessarily contains (A-1) oleic acid, and other components include one or more selected from the group consisting of (A-2) straight-chain fatty acids having 12 to 22 carbon atoms other than oleic acid.

[0013] ((A-1) Oleic acid) The oleic acid (A-1) contained in the cleansing composition of the present invention is not particularly limited as long as it is used in the fields of pharmaceuticals, quasi-drugs, or cosmetics, for example, as a component of topical preparations.

[0014] In the cleaning composition of the present invention, the content of component (A-1) relative to the total amount of the cleaning composition is appropriately set depending on the balance with other components. From the viewpoint of exerting the effects of the present invention, the content of component (A-1) relative to the total amount of the cleaning composition is preferably 0.1 to 10 mass%.

[0015] ((A-2) Straight-chain fatty acids with 12 to 22 carbon atoms other than oleic acid) The straight-chain fatty acid having 12 to 22 carbon atoms other than oleic acid contained in the cleansing composition of the present invention is not particularly limited as long as it is used in the fields of pharmaceuticals, quasi-drugs, or cosmetics, for example, as a component of topical preparations.

[0016] The straight-chain fatty acid having 12 to 22 carbon atoms other than oleic acid contained in the cleaning composition of the present invention may be a saturated or unsaturated straight-chain fatty acid having 12 to 22 carbon atoms. Preferred examples include straight-chain saturated fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, margaric acid, arachidic acid, and behenic acid; and unsaturated fatty acids such as linoleic acid, linolenic acid, elaidic acid, arachidonic acid, palmitoleic acid, eicosapentaenoic acid, vaccenic acid, and docosahexaenoic acid.

[0017] For example, but not limited to, component (A-2) is preferably one or more selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid, and particularly preferably two or more selected from the group consisting of lauric acid, myristic acid, palmitic acid, and stearic acid.

[0018] In the cleaning composition of the present invention, the content of component (A-2) relative to the total amount of the cleaning composition is appropriately set based on the balance with other components. From the viewpoint of exerting the effects of the present invention, the content of component (A-2) relative to the total amount of the cleaning composition is preferably 0.1 mass% or more, more preferably 0.3 mass% or more, and even more preferably 0.5 mass% or more. From the viewpoint of exerting the effects of the present invention, the content of component (A-2) is preferably 50 mass% or less, more preferably 40 mass% or less, and even more preferably 35 mass% or less.

[0019] The total content of the component (A-2) relative to the total amount of the cleaning composition is preferably 10 to 50 mass %, more preferably 20 to 40 mass %, and even more preferably 25 to 35 mass %.

[0020] The total amount of the (A-1) component and the (A-2) component is not particularly limited, but is preferably 10.1 to 60 mass %, more preferably 20.1 to 50 mass %, and even more preferably 25.1 to 45 mass %, of the total amount of the composition.

[0021] The mass ratio of the component (A-1) to the component (A-2) is not particularly limited, but is preferably The amount of the component (A-2) is preferably 1 to 500 parts by mass, more preferably 2 to 400 parts by mass, and even more preferably 2.5 to 350 parts by mass per part by mass of the component (A-1).

[0022] ((B) Polyethylene glycol monostearate) The polyethylene glycol monostearate (B) contained in the cleansing composition of the present invention is not particularly limited as long as it is used in the fields of pharmaceuticals, quasi-drugs, or cosmetics, for example, as a component of topical preparations.

[0023] The average number of moles of ethylene oxide added in (B) polyethylene glycol monostearate of the present invention is preferably 2 to 250, more preferably 2 to 150, and even more preferably 2 to 20, from the viewpoint of exerting the effects of the present invention.

[0024] In the present invention, (B) polyethylene glycol monostearate may contain two or more types having different average numbers of moles of ethylene oxide added.

[0025] In the cleaning composition of the present invention, the content of component (B) relative to the total amount of the cleaning composition is appropriately set based on the balance with other components. From the viewpoint of exerting the effects of the present invention, the content of component (B) relative to the total amount of the cleaning composition is preferably 0.1% by mass or more, more preferably 1% by mass or more, and even more preferably 2% by mass or more. From the viewpoint of exerting the effects of the present invention, the content of component (B) is preferably 15% by mass or less, more preferably 12% by mass or less, and even more preferably 9% by mass or less.

[0026] The total content of component (B) relative to the total amount of the cleaning composition is preferably 0.1 to 15 mass %, more preferably 1 to 12 mass %, and even more preferably 2 to 9 mass %.

[0027] The mass ratio of component (A) to component (B) is not particularly limited, but is preferably 0.001 to 1.5 parts by mass, more preferably 0.01 to 1 part by mass, and even more preferably 0.1 to 1 part by mass of component (B) per 1 part by mass of component (A).

[0028] ((C) Basic component) The basic component (C) contained in the cleaning composition of the present invention is not particularly limited as long as it is used in the fields of pharmaceuticals, quasi-drugs, or cosmetics, for example, as a component of topical preparations.

[0029] The basic component (C) contained in the cleaning composition of the present invention is not limited to, but may be, for example, one or more selected from the group consisting of alkali metal hydroxides, alkaline earth metal hydroxides, aluminum hydroxide, sodium carbonate, calcium carbonate, trimethanolamine, triethanolamine, ammonia, and ammonia salts. Examples of alkali metal hydroxides include sodium hydroxide and potassium hydroxide. Examples of alkaline earth metal hydroxides include calcium hydroxide and barium hydroxide.

[0030] For example, but not limited to, component (C) is preferably one or more selected from the group consisting of sodium hydroxide, potassium hydroxide, aluminum hydroxide, triethanolamine, trimethanolamine, and aluminum hydroxide, and particularly preferably one or more selected from the group consisting of sodium hydroxide and potassium hydroxide.

[0031] In the cleaning composition of the present invention, the content of component (C) relative to the total amount of the cleaning composition is appropriately set depending on the balance with other components. From the viewpoint of exerting the effects of the present invention, the content of component (C) relative to the total amount of the cleaning composition is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. In order to achieve the effects of the present invention, the content of the component (C) is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 10% by mass or less.

[0032] The total content of component (C) relative to the total amount of the cleaning composition is preferably from 0.01 to 30 mass %, more preferably from 0.1 to 20 mass %, and even more preferably from 0.2 to 10 mass %.

[0033] (neutralization rate) In the cleaning composition of the present invention, component (A) is neutralized with a base, and the neutralization rate of component (A) is 90% or more, preferably 95% or more. If the neutralization rate is 95% or more, it is acceptable for some higher fatty acids to remain unneutralized, but 100% neutralization is also acceptable. In the cleaning composition of the present invention, the neutralization rate is calculated using the following formula: Neutralization rate (%) = gram equivalent of basic component / gram equivalent of component (A) × 100

[0034] (Other ingredients) From the viewpoint of improving foaming and usability, the cleaning composition of the present invention also preferably contains, in addition to the components (A), (B), and (C) described above, (D) at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide, as long as the effects of the present invention are not impaired. Of these, coconut oil fatty acid N-methylethanolamide is particularly preferred. There are no particular restrictions on (D) the at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide, as long as it is used in the fields of pharmaceuticals, quasi-drugs, or cosmetics, for example, as a component of topical preparations.

[0035] In the cleaning composition of the present invention, the content of component (D) relative to the total amount of the cleaning composition is appropriately set based on the balance with other components. From the viewpoint of exerting the effects of the present invention, the content of component (D) relative to the total amount of the cleaning composition is preferably 0.01 mass% or more, more preferably 0.1 mass% or more, and even more preferably 0.2 mass% or more. In order to achieve the effects of the present invention, the content of the component (D) is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less.

[0036] The content of component (D) relative to the total amount of the cleaning composition is preferably from 0.01 to 5 mass %, more preferably from 0.1 to 3 mass %, and even more preferably from 0.2 to 1 mass %.

[0037] The mass ratio of component (A) to component (D) is not particularly limited, but is preferably 0.0001 to 5 parts by mass, more preferably 0.001 to 3 parts by mass, and even more preferably 0.01 to 1 part by mass of component (D) per 1 part by mass of component (A).

[0038] (Base, carrier, or other ingredient) The cleaning composition of the present invention may contain a base, carrier, or other component in addition to the components (A), (B), and (C) described above, so long as the effects of the present invention are not impaired from the standpoint of improving usability and stability. Specifically, the cleaning composition may contain surfactants, higher fatty acids other than component (A), higher alcohols, hydrocarbons, oils and fats, waxes, ester oils, moisturizing components, polyhydric alcohols, thickeners, refreshing agents, antioxidants, preservatives or antiseptics, pH adjusters, or chelating agents. Furthermore, the cleaning composition may contain anti-inflammatory agents, antibacterial and antiseptic components, astringent components, scrubbing agents, and the like. These components used in the present invention are not particularly limited as long as they are used in the fields of pharmaceuticals, quasi-drugs, or cosmetics, for example, as components of topical preparations. The cleaning composition of the present invention may also contain or exclude water.

[0039] Herein, the term "salt" refers to, for example, organic salts and inorganic salts. Examples of organic salts include ammonium, diethanolamine, triethanolamine, ethylenediamine, etc., and examples of inorganic salts include salts with sodium, potassium, calcium, magnesium, etc. Further examples include salts with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, and phosphoric acid; salts with organic acids such as methanesulfonic acid, benzenesulfonic acid, paratoluenesulfonic acid, acetic acid, propionic acid, tartaric acid, fumaric acid, maleic acid, malic acid, oxalic acid, succinic acid, citric acid, benzoic acid, mandelic acid, cinnamic acid, lactic acid, glycolic acid, glucuronic acid, ascorbic acid, nicotinic acid, and salicylic acid; and salts with acidic amino acids such as aspartic acid and glutamic acid. The term "salt" may also include solvates or hydrates of the salt.

[0040] <Surfactant> The surfactant may be any of a nonionic surfactant, an anionic surfactant, an amphoteric surfactant, and the like.

[0041] Examples of anionic surfactants include alkyl sulfate ester salts (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); alkyl ether sulfate ester salts (e.g., POE-lauryl triethanolamine sulfate, POE-lauryl sodium sulfate, sodium laureth sulfate, etc.); N-acyl sarcosinate (e.g., sodium lauroyl sarcosinate, etc.); fatty acid alkanolamides (e.g., coconut oil fatty acid monoethanolamide, lauroyl monoethanolamide, etc.); higher fatty acid amide sulfonates (e.g., sodium N-myristoyl-N-methyl taurate, sodium coconut oil fatty acid methyl taurate, sodium lauryl methyl taurate, etc.); phosphate ester salts (POE-oleic acid ester salts, sodium lauryl methyl taurate, etc.); sodium ethyl ether phosphate, POE-stearyl ether phosphate, sodium lauryl phosphate, sodium polyoxyethylene lauryl ether phosphate, etc.; sulfosuccinates (e.g., sodium alkyl sulfosuccinate, sodium di-2-ethylhexyl sulfosuccinate, sodium polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol sulfosuccinate, etc.); alkylbenzenesulfonates (e.g., sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); amino acid surfactants (e.g., sodium cocoyl glutamate, N-acyl glutamate, etc.); N-Acyl glutamates (e.g., potassium lauroyl glutamate, monosodium N-lauroyl glutamate, disodium N-stearoyl glutamate, monosodium N-myristoyl-L-glutamate, etc.); higher fatty acid ester sulfates (e.g., sodium hydrogenated coconut oil fatty acid glycerin sulfate, etc.); sulfated oils (e.g., turmeric oil, etc.); ether carboxylates (e.g., polyoxyethylene alkyl ether carboxylic acid, polyoxyethylene alkyl allyl ether carboxylate, sodium polyoxyethylene lauryl ether acetate, etc.); α-olefin sulfonates; higher fatty acid ester sulfonates; secondary alcohol sulfates; higher fatty acid alkylolamide sulfates; sodium lauroyl monoethanolamide succinate; N-palmitoyl aspartic acid ditriethanolamine;Sodium caseinate, etc.;

[0042] Examples of amphoteric surfactants include imidazoline-based amphoteric surfactants (e.g., 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.); betaine-based surfactants (e.g., 2-heptadecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryl dimethylaminoacetic acid betaine, alkyl betaine, amido betaine, sulfobetaine, coconut oil fatty acid amidopropyl betaine, lauryl dimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryl hydroxysulfobetaine, lauroyl amidoethyl hydroxyethyl carboxymethyl betaine, sodium hydroxypropyl phosphate, etc.); and amino acid-based amphoteric surfactants (sodium laurylaminopropionate).

[0043] Examples of nonionic surfactants include sorbitan fatty acid esters (e.g., sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, diglycerol sorbitan penta-2-ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, etc.); propylene glycol fatty acid esters (e.g., propylene glycol monostearate, etc.); hydrogenated castor oil derivatives (e.g., polyoxyethylene hydrogenated castor oil 40 (HCO-40), polyoxyethylene hydrogenated castor oil 50 (HCO-50), polyoxyethylene hydrogenated castor oil 60 (HCO-60), polyoxyethylene hydrogenated castor oil 80, etc.); polyoxyethylene sorbitan fatty acid esters (e.g., monolauryl Polyoxyethylene (20) sorbitan monostearate (polysorbate 20), polyoxyethylene (20) sorbitan monooleate (polysorbate 60), polyoxyethylene (20) sorbitan monooleate (polysorbate 80), polyoxyethylene (20) sorbitan isostearate, etc.; glycerin derivatives (e.g., polyoxyethylene monococoglyceryl, glycerin alkyl ether); polyoxyalkylene alkyl ethers (e.g., polyoxyethylene cetyl ether, etc.); silicone surfactants (e.g., polyoxyethylene-methylpolysiloxane copolymer, lauryl PEG-9 polydimethylsiloxyethyl dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, etc.); alkyl glucosides; etc.

[0044] <Higher fatty acids> As the higher fatty acid, for example, a saturated or unsaturated fatty acid other than component (A) can be used, and preferred examples include branched fatty acids such as isostearic acid or lanolin fatty acid, and 1,2-hydroxystearic acid.

[0045] <Higher alcohol> Examples of higher alcohols include higher alcohols having 12 to 22 carbon atoms and sterols. Preferred examples include linear saturated alcohols (solid at room temperature) such as lauryl alcohol, myristyl alcohol, cetanol, cetostearyl alcohol, stearyl alcohol, arachyl alcohol, and behenyl alcohol; unsaturated alcohols (liquid at room temperature) such as oleyl alcohol and selachyl alcohol; branched alcohols (liquid at room temperature) such as hexyldecanol, isostearyl alcohol, octyldodecanol, decyltetradecanol, lanolin alcohol, and isostearyl glyceryl ether; phytosterols, and cholesterol.

[0046] <Hydrocarbons> Examples of hydrocarbons include paraffin, ceresin, isoparaffin, hard fat, microcrystalline wax, polybutene, polyethylene powder, liquid paraffin, squalane, petrolatum, gelling hydrocarbons (such as Plastibase), ozokerite, α-olefin oligomers, light liquid paraffin, and hydrocarbons such as light liquid paraffin.

[0047] <Oils and fats> Examples of fats and oils include avocado oil, linseed oil, camellia oil, macadamia nut oil, corn oil, olive oil, safflower oil, apricot kernel oil, cinnamon oil, jojoba oil, grape seed oil, sunflower oil, almond oil, camellia oil, rapeseed oil, sesame oil, cacao butter, coconut oil, hardened coconut oil, palm oil, palm kernel oil, Japan wax kernel oil, Japan wax, wheat germ oil, rice germ oil, rice bran oil, cottonseed oil, soybean oil, peanut oil, tea seed oil, evening primrose oil, kukui nut oil, hazelnut oil, and shea butter.

[0048] <Waxes> Examples of waxes include candelilla wax, rice bran wax, cotton wax, carnauba wax, lanolin, lanolin fatty acid isopropyl, POE lanolin alcohol ether, POE lanolin alcohol acetate, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether, shellac wax, and beeswax.

[0049] <Ester oil> Ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, isopropyl isostearate, octyl palmitate, octyl isopalmitate, cetyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, isodecyl oleate, hexyldecyl dimethyloctanoate, diisopropyl sebacate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, and diisopropyl adipate. , 2-hexyldecyl adipate, isononyl isononanoate, isotridecyl isononanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, isostearyl isostearate, cholesteryl 12-hydroxystearate, cholesteryl stearate, cholesteryl oleate, phytosteryl macadamiate, phytosteryl oleate, dextrin palmitate, inulin stearate, hydrogenated jojoba oil, ethylene glycol di-2-ethylhexyl ester, cetyl 2-ethylhexanoate.Dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, tri-2-ethylhexyl trimellitate, tritridecyl trimellitate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glycerin tri-2-ethylhexanoate, trimethylolpropane triisostearate, ceteth-2-ethylhexanoate Cetyl 2-ethylhexanoate, Glycerin Trimyristate, Caprylic / Capric Triglyceride, Caprylic / Capric / Myristic / Stearic Triglyceride, Tri-2-heptylundecanoic Glyceride, Castor Oil Fatty Acid Methyl Ester, Oleyl Oleate, 2-Heptylundecyl Palmitate, Diisobutyl Adipate, Phytosteryl / Octyldodecyl Lauroyl Glutamate, Phytosteryl / Behenyl / Octyldodecyl Lauroyl Glutamate, Di-2-Heptyl Adipate Butylundecyl, Ethyl Laurate, Bisethoxydiglycol Cyclohexane-1,4-dicarboxylate, 2-Ethylhexyl Succinate, Diethoxyethyl Succinate, Triethyl Citrate, Decaglyceryl Eicosandioate / Tetradecanedioate, Ethyl Acetate, Butyl Acetate, Amyl Acetate, Triethyl Citrate, Phytosteryl / Isostearyl / Cetyl / Stearyl / Behenyl Dimer Dilinoleate, Polyglyceryl-2 Triisostearate, Dimer Dilinoleyl Dimer Dilinoleate, Tripolyhydroxystearic Acid Examples of suitable ester oils include dipentaerythrityl, glyceryl tri(behenate / isostearate / eicosanedioate), polyglyceryl-10 (eicosanedioate / tetradecanedioate), bisethoxydiglycol cyclohexanedicarboxylate, bis(triethylene glycol monoethyl ether) 1,4-cyclohexanedicarboxylate, bis(diethylene glycol monoethyl ether) adipate, bis(triethylene glycol monoethyl ether) adipate, and diethoxyethyl succinate, diethylhexyl succinate, and the like.

[0050] <Moisturizing ingredients> Examples of moisturizing ingredients include hyaluronic acid (including hydrolyzed hyaluronic acid, low-molecular-weight hyaluronic acid, etc.); salts of hyaluronic acid (for example, sodium hyaluronate, zinc hyaluronate, low-molecular-weight zinc hyaluronate, etc.); hyaluronic acid derivatives (acetylated hyaluronic acid or its salts (for example, sodium acetylated hyaluronate, zinc acetylated hyaluronate, etc.), crosslinked hyaluronic acid derivatives (sodium hyaluronate crosspolymer, etc.), sodium carboxymethyl hyaluronate, unsaturated hyaluronic acid or its salts, hydrolyzed hyaluronic acid Alkyl (C12-13) glyceryl, cationized hyaluronic acid derivatives (hydroxypropyltrimonium hyaluronate, etc.), dimethylsilanol hyaluronate, etc.); chondroitin sulfate or its salts (sodium chondroitin sulfate, potassium chondroitin sulfate, sodium dermatan sulfate, potassium dermatan sulfate, etc.); heparinoids, amino acids such as alanine, serine, aspartic acid, glycine, proline, hydroxyproline, glucosamine, theanine, arginine, and their derivatives; polyhydric alcohols Alkylene oxides such as PPG-17 buteth-17, PPG-25 sorbitol, polyoxyalkylene alkyl glucoside, PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin, and polyoxyalkylene diglyceryl; glycosyl trehalose, trehalose; ceramide, glucosyl ceramide, cholesterol, phytosterol, cholesterol derivatives, phytosterol derivatives; phospholipids such as lecithin and hydrogenated lecithin; 2-methacryloyloxyethyl phosphorylcholine methacrylate Examples of such ingredients include 2-methacryloyloxyphosphorylcholine-containing polymers such as butyl acetate copolymer solution and polymethacryloyloxyethyl phosphorylcholine; NMF-derived components such as lactic acid, sodium lactate, sodium pyrrolidonecarboxylate, and urea; collagen, elastin, keratin, chitin, chitosan, and the like and their hydrolysates; hydroxyethyl urea; and components derived from plants (for example, aloe, seaweed, pueraria lobata, chlorella, lemongrass, chamomile, hamamelis, tea, perilla, grapefruit, and Gynostemma pentaphyllum).

[0051] <Polyhydric alcohol> Examples of polyhydric alcohols include diols and polyhydric alcohols having three or more hydroxy groups, such as glycerin, diglycerin, triglycerin, propylene glycol, dipropylene glycol, 1,3-butanediol, ethylene glycol, diethylene glycol, isoprene glycol, 1,3-butylene glycol, 1,3-propanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, decanediol, neopentyl glycol, polyethylene glycol, and sugar alcohols (such as sorbitol, xylitol, erythritol, maltose-sucrose condensates (glucooligosaccharides), and hydrolyzed xylan (xylooligosaccharides)). Among these, those having 2 to 10 carbon atoms are preferred, and a combination of one or more selected from glycerin, diglycerin, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,2-pentanediol, 1,2-hexanediol, and 1,3-propanediol is preferred.

[0052] <Thickener> Examples of thickeners include nonionic polymers and ionic polymers. Examples of nonionic polymers include vinyl thickeners such as polyvinyl alcohol, polyvinylpyrrolidone, and polyvinyl methyl ether, cellulose thickeners such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, carboxymethyl cellulose, carboxyethyl cellulose, and hydrophobized hydroxypropyl methylcellulose, guar gum, sclerotium gum, tamarind gum, xanthan gum, dextran, pectin, pullulan, gelatin, locust bean gum, carrageenan, agar, biosaccharide gum, bentonite, dextrin fatty acid esters, dimethyl distearyl ammonium hectorite, sodium alginate, propylene glycol alginate, polyethylene glycol, and macrogol. Examples of ionic polymers include carboxyvinyl polymer, trimethylammonium chloride hydroxypropyl guar gum, trimethylammonio chloride hydroxypropyl hydroxyethyl cellulose, acrylate / alkyl methacrylate copolymer, sodium polyacrylate, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer, etc. Ionic polymers are not salt-tolerant, so they must be used in large amounts in soapy facial cleansers. This results in a poor feel during use, making them undesirable. On the other hand, nonionic polymers are preferred because they are not prone to salt tolerance.

[0053] <Refreshing agent> Examples of the cooling agent include terpenes such as menthol and its derivatives, camphor, chlorobutanol, borneol, geraniol, cineol, anethole, limonene, eugenol (any of these may be d-form, l-form or dl-form); essential oils such as eucalyptus oil, bergamot oil, peppermint oil, cool mint oil, spearmint oil, star anise oil, perilla oil, cinnamon oil, rose oil, turpentine oil, etc. Among them, combinations of l-menthol, menthyl glyceryl ether, menthyl lactate, menthyl 3-hydroxybutyrate, menthoxypropanediol, camphor, eucalyptus oil, peppermint oil, and perilla oil are preferred.

[0054] <Antioxidant> Examples of the antioxidant include dibutylhydroxytoluene, butylhydroxyanisole, sorbic acid, sodium sulfite, ascorbic acid, ascorbic acid derivatives, tocopherol, tocopherol derivatives, tocotrienol, bisulfite, sodium metabisulfite, sulfur dioxide, calcium disodium EDTA, erythorbic acid, sodium erythorbate, L-cysteine hydrochloride, etc.

[0055] <Preservative or antiseptic> Examples of the preservative or antiseptic include benzoic acid, sodium benzoate, dehydroacetic acid, sodium dehydroacetate, isobutyl parabenzoate, isopropyl parabenzoate, butyl parabenzoate, ethyl parabenzoate, propyl parabenzoate, benzyl parabenzoate, methyl parabenzoate, phenoxyethanol, benzyl alcohol, thymol, isopropylmethylphenol, caprylic hydroxamic acid, chlorobutanol, sorbic acid, potassium sorbate, chlorhexidine gluconate, methylisothiazolinone, propiolyl iodide butylcarbamate, 1,3-propanediol, 1,2-pentanediol, 1,2-hexanediol, or 1,2-octanediol, etc.

[0056] <pH adjuster> Examples of pH adjusters that can be used include inorganic acids (hydrochloric acid, sulfuric acid, etc.), organic acids (lactic acid, citric acid, tartaric acid, malic acid, succinic acid, etc.), and other adjusters known to those skilled in the art.

[0057] <Chelating agent> Examples of chelating agents include ethylenediaminetetraacetic acid (edetic acid), ethylenediaminetetraacetic acid salts (sodium salts (sodium edetate: Japanese Pharmacopoeia, EDTA-2Na, etc.), potassium salts, etc.), phytic acid, gluconic acid, polyphosphoric acid, metaphosphoric acid, etc. Among these, sodium edetate is preferred.

[0058] <Anti-inflammatory ingredients> Anti-inflammatory ingredients include, for example, allantoin and its derivatives (e.g., alcloxa, allantoin, etc.), calamine, tranexamic acid, glycyrrhizic acid or its derivatives or salts thereof (e.g., dipotassium glycyrrhizinate, monoammonium glycyrrhizinate, etc.), glycyrrhetinic acid or its derivatives or salts thereof (e.g., glycyrrhetinic acid, stearyl glycyrrhetinate, etc.), zinc oxide, aminocaproic acid, azulene and its derivatives (e.g., guaiazulene, etc.), Examples of such an active ingredient include benzoyl peroxide, benzoyl peroxide, benzoyl peroxide (e.g., benzoyl peroxide, benzoyl peroxide), benzoyl peroxide (e.g., benzoyl peroxide, benzoyl peroxide), benzoyl peroxide (e.g., benzoyl peroxide, benzoyl peroxide), benzoyl peroxide, ... Preferably, it is one or more selected from allantoin, tranexamic acid, dipotassium glycyrrhizinate, monoammonium glycyrrhizinate, glycyrrhetinic acid, stearyl glycyrrhetinate, aminocaproic acid, azulene and its derivatives, ascorbic acid, salts of ascorbic acid or derivatives of ascorbic acid, Houttuynia cordata extract, and bilberry leaf extract, and more preferably, it is one or more selected from allantoin, tranexamic acid, dipotassium glycyrrhizinate, glycyrrhetinic acid, aminocaproic acid, and magnesium ascorbyl phosphate.

[0059] <Antibacterial / sterilizing ingredients> Antibacterial and disinfectant ingredients include, for example, chlorhexidine, salicylic acid, benzalkonium chloride, acrinol, ethanol, benzethonium chloride, cetyltrimethylammonium chloride, cresol, gluconic acid and its derivatives, povidone-iodine, potassium iodide, iodine, isopropylmethylphenol, triclocarban, triclosan, zinc pyrithione, photosensitizer No. 101, photosensitizer No. 201, paraben, phenoxyethanol, alkyldiaminoglycine hydrochloride, cetylpyridinium chloride, piroctoolamine, and mirin. Examples of effective active ingredients include conazole or a salt thereof, chlorobutanol, ethylhexylglycerin, iodopropynyl butylcarbamate, caprylhydroxamic acid, phenethyl alcohol, methylisothiazolinone, sorbic acid, β-glycyrrhetinic acid, azelaic acid, alkanediols having 5 to 10 carbon atoms (e.g., 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, etc.), and ingredients derived from plants (e.g., aloe, sophora flavescens, rosemary, mulberry, eucalyptus, cinchona, clove, etc.). Preferably, one or more selected from azelaic acid, salicylic acid, benzalkonium chloride, ethanol, benzethonium chloride, gluconic acid, isopropylmethylphenol, paraben, phenoxyethanol, cetylpyridinium chloride, chlorobutanol, ethylhexylglycerin, iodopropynyl butylcarbamate, caprylhydroxamic acid, sorbic acid, β-glycyrrhetinic acid, rosemary extract, eucalyptus extract, aloe extract, cinchona extract, 1,2-pentanediol, and 1,2-hexanediol are preferred.

[0060] <Astringent ingredients> Examples of astringent ingredients include metal salts such as alum, chlorohydroxyaluminum, aluminum chloride, aluminum allantoin, zinc paraphenolsulfonate, basic aluminum zinc lactate, zinc sulfate, and potassium aluminum sulfate; organic acids such as tannic acid, citric acid, lactic acid, and succinic acid; and ingredients derived from plants (e.g., seaweed, thyme, black tea, oolong tea, green tea, St. John's wort, witch hazel, loquat, moutan nut, saxifrage, rooibos, astragalus, artichoke, chamomile, eucalyptus, lemon, rosemary, and burnet).

[0061] <Scrubbing agent> Examples of scrubbing agents include apricot kernel powder, almond shell powder, apricot kernel powder, sodium chloride granules, olive kernel powder, seawater dried granules, candelilla wax, walnut shell powder, cherry kernel powder, coral powder, charcoal powder, hazelnut shell powder, polyethylene powder, and silicic anhydride.

[0062] [pH] The pH of the cleaning composition of the present invention is preferably 6-13, more preferably 7-12, and even more preferably 8-11.

[0063] [Physical Properties] The cleaning composition of the present invention has rheological properties that do not cause significant viscosity increase or decrease within the temperature range in which it is used.

[0064] The viscosity of the cleaning composition of the present invention at 25°C is not limited, but is preferably 100 to 2000 Pa·s, more preferably 100 to 1500 Pa·s, and even more preferably 150 to 1500 Pa·s. Here, the viscosity is measured using a Brookfield viscometer. The rate of change of the viscosity at 40°C to that at 25°C is not limited, but is preferably 0 to less than 40%, and more preferably 0 to 20%. Here, the rate of change of viscosity at 40°C and viscosity at 25°C is calculated using the following formula. Viscosity at 40℃ and viscosity at 25℃ change rate (%) = |(Viscosity at 1-40°C / Viscosity at 25°C) x 100| Here, the rate of change is expressed as an absolute value.

[0065] [container] The container for filling the cleaning composition of the present invention is not particularly limited. It may be any container suitable for use as a container for topical pharmaceutical preparations, quasi-drugs, or cosmetics. Examples of such container materials include containers in which a part or all, preferably all, of the surface that comes into contact with the cleaning composition is made of at least one material selected from the group consisting of polyolefin resin, acrylic resin, polyester, polycarbonate, fluororesin, polyvinyl chloride, polyamide, ABS resin, AS resin, polyacetal, modified polyphenylene ether, polyarylate, polysulfone, polyimide, cellulose acetate, aluminum, and glass.

[0066] From the viewpoint of ease of handling of the formulation, polyethylene (PE) (including high-density polyethylene (HDPE), low-density polyethylene (LDPE), very-low-density polyethylene, linear low-density polyethylene (LLDPE), ultra-high-molecular-weight polyethylene, etc.), polypropylene (PP) (including isotactic polypropylene, syndiotactic polypropylene, atactic polypropylene, etc.), and polyolefin resins such as ethylene-propylene copolymer, polymethylpentene, polybutene-1,1,2-polybutadiene, polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate are preferred, and polyethylene or polypropylene is more preferred.

[0067] The shape of the container is not limited, but is preferably a tube, a squeeze container, or a pump container.

[0068] [Application] The cleansing composition of the present invention may be in a known form such as a pharmaceutical, quasi-drug, or cosmetic, for example, in a form suitable for use on hair or skin. The cleansing composition of the present invention is preferably a cleansing composition that is rinsed off after use. Considering that the present invention allows the preparation of a topical composition with a certain degree of viscosity, it is preferably used as a cleansing composition that is desired to have an appropriate viscosity upon use. The form of the topical cleansing composition is not particularly limited, but may be, for example, shampoo (hair shampoo, dry shampoo, rinse-in shampoo, etc.), soap (liquid soap, foam soap, body soap (also called body shampoo), hand soap, facial cleanser, makeup remover cleanser, etc.). Among these, shampoo, body soap, hand soap, liquid soap, facial cleanser, and makeup remover cleanser are preferred, as they are often desired to have an appropriate viscosity. In particular, facial cleanser, makeup remover cleanser, and shampoo are preferred.

[0069] [Dosage form] The cleaning composition of the present invention is provided in any form that can be widely used as a pharmaceutical product, quasi-drug, etc. Preferably, it is provided as a formulation that can be used as an external preparation. The cleaning composition of the present invention is not particularly limited as long as it is in a known form, but from the viewpoint of more significantly exhibiting the effects of the present invention, it can also be provided as, for example, a lotion, gel, mousse, liquid, suspension, emulsion, cream, ointment, gel, liniment, etc. Among these, it is preferably used in the form of an emulsion, cream, ointment, or gel.

[0070] [Manufacturing method] The cleaning composition of the present invention can be produced by known methods. It may be produced by mixing the components in accordance with or in accordance with the General Provisions of the Japanese Pharmacopoeia, 17th Edition. If necessary, a sterilization step or a filtration step may be included.

[0071] [Viscosity maintenance method] The viscosity maintaining method of the present invention comprises: (A) Straight-chain fatty acids with 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; and (C) Contains a basic component, Here, component (A) is characterized by comprising (A-1) oleic acid and (A-2) a straight-chain fatty acid other than oleic acid having 12 to 22 carbon atoms, and having a neutralization rate of 90% or more of component (A). Other components, such as (D) at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide, as well as other components, containers, dosage forms, etc., are as described in [Cleaning Composition].

[0072] Here, the viscosity maintenance is in accordance with the content described in [Cleaning composition].

[0073] The present invention includes the following aspects. [1] A cleaning composition comprising the following components (A), (B), and (C): (A) Straight-chain fatty acids with 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; and (C) Contains a basic component, wherein the component (A) comprises (A-1) oleic acid and (A-2) a linear fatty acid having 12 to 22 carbon atoms other than oleic acid; A cleaning composition in which the neutralization rate of component (A) is 90% or more. [2] The cleaning composition according to [1], wherein the component (A-2) is one or more selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid. [3] The cleaning composition according to [1] or [2], wherein the component (A-2) is two or more acids selected from the group consisting of lauric acid, myristic acid, palmitic acid, and stearic acid. [4] The cleaning composition according to any one of [1] to [3], further comprising (D) at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide. [5] The cleaning composition according to any one of [1] to [4], wherein the component (C) is at least one selected from the group consisting of sodium hydroxide and potassium hydroxide. [6] The cleaning composition according to any one of [1] to [5], wherein the component (A) is contained in an amount of 10.1 to 60 mass % based on the total amount of the composition. [7] The cleaning composition according to any one of [1] to [6], wherein the component (A-1) is contained in an amount of 0.1 to 10 mass % based on the total amount of the composition. [8] The cleaning composition according to any one of [1] to [7], wherein the component (A-2) is contained in an amount of 10 to 50 mass % based on the total amount of the composition. [9] The cleaning composition according to any one of [1] to [8], wherein the component (A-2) is contained in an amount of 1 to 500 parts by mass per part by mass of the component (A-1), and the component (A-2) is contained in an amount of 10 to 50% by mass based on the total amount of the composition.

[10] The cleaning composition according to any one of [1] to [9], wherein the mass ratio of the component (A) to the component (B) is 0.001 to 1.5 parts by mass of the component (B) per 1 part by mass of the component (A).

[11] The cleaning composition according to any one of [1] to

[10] , wherein the total content of the component (C) is 0.01 to 30% by mass based on the total amount of the composition.

[12] The cleaning composition according to [4], wherein the mass ratio of the component (A) to the component (D) is 1 part by mass of the component (A) to 0.0001 to 5 parts by mass of the component (D).

[13] The cleansing composition according to any one of [1] to

[12] , which is a tube-packed facial cleanser.

[14] (A) Straight-chain fatty acids with 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; and (C) A basic component is present, The method for maintaining the viscosity of a cleaning composition is characterized in that component (A) consists of (A-1) oleic acid and (A-2) a straight-chain fatty acid having 12 to 22 carbon atoms other than oleic acid, and the neutralization rate of component (A) is 90% or more.

[15] The method for maintaining the viscosity of the cleaning composition according to

[14] , further characterized by coexisting (D) at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide. [Example]

[0074] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

[0075] The compositions of the examples and comparative examples shown in Table 1 were prepared in a conventional manner by reacting a heated and dissolved fatty acid phase with a heated alkali phase to form soap, holding the mixture for a certain period of time, and then cooling. The blending ratios shown in Table 1 are in mass %. The polyethylene glycol monostearate used had an average added mole number of ethylene oxide of 2.

[0076] (Test Example 1: Viscosity Measurement) 50 g of the compositions (facial cleansers) of the Examples and Comparative Examples in Table 1 were filled into glass bottles (50 mL) and left to stand at 25°C or 40°C for one day. Thereafter, the viscosity was measured at room temperature for the samples stored at 25°C, and at 40°C for the samples stored at 40°C using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd.) under the following conditions: Rotor: M4, Rotation speed: 0.6 rpm, Measurement time: 120 seconds

[0077] The value calculated based on the following formula was then used as the viscosity change rate when the temperature was changed from 25°C to 40°C, and was compared. (Equation 1) Viscosity change rate (%) = |(viscosity at 1-40°C / viscosity at 25°C) × 100|

[0078] [Table 1]

[0079] Here, the viscosity (Pa·s) (at room temperature) is: ◎: 150 or more 〇: Less than 150, 100 or more △: Less than 100 50 or more ×: Less than 50 ND: Below detection limit is shown as. The viscosity reduction rate is ◎: 20% or less 〇: 20% or more but less than 40% ×: 40% or more -: Calculation not possible (including values ​​below the detection limit) is shown as.

[0080] (Test Example 2: Evaluation of Sauce) 50 g of the compositions (face washes) of the Examples and Comparative Examples in Table 1 were filled into glass bottles (50 mL) and left to stand for one day at 25° C. or 40° C. After that, a spoonful of each composition was scraped out with a spatula at room temperature for the samples stored at 25° C., and at 40° C. for the samples stored at 40° C., and placed on a slide glass to visually evaluate the degree of dripping of the composition (face wash). The composition of the comparative example dripped onto the glass slide, whereas the composition of the example did not drip and remained on the glass slide.

[0081] From the above evaluation, it was found that the compositions of the Examples had little dripping, and in particular were able to withstand being filled into a tube container, and after being filled into the tube container, could be discharged from the opening of the container without dripping. On the other hand, the compositions of the comparative examples all dripped heavily and were not suitable for filling tube containers. Even when filled into a container, they dripped from the opening of the container, making them unusable or difficult to discharge.

[0082] (Test Example 3: Water solubility and foaming test) Furthermore, when the compositions (face washes) of the Examples and Comparative Examples in Table 1 were dissolved in water at 25°C and foaming was observed, it was observed that the compositions of the Examples had good water solubility and foaming properties.

[0083] Examples of formulations of the present invention are shown below. <Formulation example 1: Facial cleanser> Lauric acid 8% by mass Myristic acid 8% by mass Palmitic acid 12% by mass Oleic acid 1% by mass 1,3-butylene glycol 5% by mass Concentrated glycerin 20% by mass Ethylene glycol distearate 2% by mass Polyethylene glycol distearate (1) 2% by mass Polyethylene glycol monostearate 4% by mass (Select from those with an average number of moles of ethylene oxide added of 2 to 150) Coconut oil fatty acid N-methylethanolamide 0.2% by mass Potassium hydroxide 6.8% by mass Sodium hydroxide 0.3% by mass Methyl parahydroxybenzoate 0.2% by mass Phenoxyethanol 0.4% by mass EDTA-2Na 0.05% by mass fragrance trace amount Absolute ethanol (appropriate amount) Purified water (appropriate amount)

Claims

1. A cleaning composition containing the following components (A), (B), (C), and (D): (A) a straight-chain fatty acid having 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; (C) sodium hydroxide and potassium hydroxide; and (D) containing at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide; wherein the component (A) comprises (A-1) oleic acid and (A-2) a straight-chain fatty acid having 12 to 22 carbon atoms other than oleic acid; A cleaning composition in which the neutralization rate of component (A) is 90% or more.

2. 2. The cleaning composition according to claim 1, wherein the component (A) is contained in an amount of 10.1 to 60 mass % based on the total amount of the composition.

3. The cleansing composition according to claim 1 or 2, which is a tube-packed facial cleanser.

4. (A) a straight-chain fatty acid having 12 to 22 carbon atoms; (B) polyethylene glycol monostearate; and (C) sodium hydroxide and potassium hydroxide; and (D) containing at least one selected from the group consisting of coconut oil fatty acid N-methylethanolamide, coconut oil fatty acid diethanolamide, and lauric acid diethanolamide; Here, component (A) comprises (A-1) oleic acid and (A-2) a straight-chain fatty acid having 12 to 22 carbon atoms other than oleic acid, and the method for maintaining the viscosity of a cleaning composition is carried out by setting the neutralization rate of component (A) to 90% or more.

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