Hair removal agent composition

Abstract

To provide a hair remover composition that can reduce skin irritation and enhance emulsion stability.SOLUTION: A hair remover composition comprises thioglycollate and / or a salt thereof (component A), a hydrocarbon that is solid at 25°C (component B), polyoxyethylene alkyl ether with an HLB value of 12.0 or more and with an average number of moles of ethylene oxide added being less than 100 (component C), and polyoxyethylene alkyl ether with an HLB value of less than 12.0 (component D), and further comprising at least one kind of a compound selected from a group consisting of polyoxyethylene alkyl ether phosphate and / or a salt thereof (component E) and polyoxyethylene alkyl ether with an average number of moles of ethylene oxide added being 100 or more (component F).SELECTED DRAWING: None

Description

Technical Field

[0007] , ,

[0001] The present invention relates to a depilatory composition.

Background Art

[0002] Depilatory compositions containing thioglycolic acid and / or its salts as depilatory components are widely used. In this depilatory composition, the depilatory effect is exerted by reducing the disulfide bonds of keratin constituting body hair with thioglycolic acid and / or its salts.

[0003] The above depilatory composition is generally produced by emulsifying a depilatory component, an oily component, and water using an emulsifier.

[0004] Patent Document 1 below discloses a depilatory agent containing thioglycolic acid or a thioglycolate and silicone oil.

[0005] Patent Document 2 below discloses a cream-like depilatory composition containing thioglycolic acid, sodium hydroxide, calcium hydroxide, a polyoxyethylene alkyl ether having an HLB of 13 or more, an oily substance selected from the group consisting of cetyl alcohol, stearyl alcohol, liquid paraffin, and solid paraffin, and water. In this cream-like depilatory composition, each of the above components is contained in a specific content.

Prior Art Documents

Patent Documents

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] The hair removal composition is used by applying it to the skin surface where body hair grows, and then leaving it on the skin surface for several minutes to several tens of minutes.

[0008] However, conventional hair removal compositions often contain relatively high amounts of thioglycolic acid and / or its salts, or relatively high amounts of alkaline agents, which can cause strong skin irritation. Therefore, using conventional hair removal compositions can sometimes cause severe pain.

[0009] Furthermore, conventional hair removal agent compositions may not be able to sufficiently improve emulsification stability. For example, with conventional hair removal agent compositions, the viscosity of the hair removal agent composition may decrease excessively when stored for a long period of time at room temperature, or the hair removal agent composition may separate into an oil layer and a water layer when stored in a high-temperature environment.

[0010] The object of the present invention is to provide a hair removal composition that can suppress skin irritation and enhance emulsion stability. [Means for solving the problem]

[0011] The present invention provides a hair removal composition comprising the following components (A), (B), (C), and (D), and at least one compound selected from the group consisting of the following components (E) and (F).

[0012] Ingredient (A): Thioglycolic acid and / or its salt Component (B): A hydrocarbon that is solid at 25°C. Component (C): Polyoxyethylene alkyl ether with an HLB value of 12.0 or higher and an average number of moles of ethylene oxide added of less than 100. Component (D): Polyoxyethylene alkyl ether with an HLB value of less than 12.0 Ingredient (E): Polyoxyethylene alkyl ether phosphate and / or its salt Component (F): Polyoxyethylene alkyl ether with an average number of moles of ethylene oxide added of 100 or more.

[0013] In the hair removal composition of the present invention, it is preferable that the pH is 12.0 or higher.

[0014] The hair removal composition of the present invention preferably contains the following component (G).

[0015] Ingredient (G): Polyhydric alcohol [Effects of the Invention]

[0016] The hair removal composition of the present invention comprises a specific component (A), a specific component (B), a specific component (C), and a specific component (D). The hair removal composition of the present invention comprises at least one compound selected from the group consisting of a specific component (E) and a specific component (F). Because the hair removal composition of the present invention has the above configuration, skin irritation can be suppressed and emulsion stability can be enhanced. [Modes for carrying out the invention]

[0017] The present invention will be described in detail below.

[0018] The hair removal composition of the present invention comprises thioglycolic acid and / or a salt thereof, a hydrocarbon that is solid at 25°C, a polyoxyethylene alkyl ether having an HLB value of 12.0 or higher and an average number of moles of ethylene oxide added of less than 100, and a polyoxyethylene alkyl ether having an HLB value of less than 12.0.

[0019] The hair removal composition of the present invention comprises at least one compound selected from the group consisting of polyoxyethylene alkyl ether phosphate and / or its salts, and polyoxyethylene alkyl ethers having an average number of moles of ethylene oxide added of 100 or more.

[0020] In this specification, the above-mentioned "thioglycolic acid and / or its salts" may be referred to as "component (A)".

[0021] In this specification, the above-mentioned "hydrocarbon that is solid at 25°C" may be referred to as "Component (B)".

[0022] In this specification, the above-mentioned "polyoxyethylene alkyl ether having an HLB value of 12.0 or more and an average number of moles of ethylene oxide added less than 100" may be referred to as "Component (C)".

[0023] In this specification, the above-mentioned "polyoxyethylene alkyl ether having an HLB value less than 12.0" may be referred to as "Component (D)".

[0024] In this specification, the above-mentioned "polyoxyethylene alkyl ether phosphate and / or its salt" may be referred to as "Component (E)".

[0025] In this specification, the above-mentioned "polyoxyethylene alkyl ether having an average number of moles of ethylene oxide added of 100 or more" may be referred to as "Component (F)".

[0026] Therefore, the hair remover composition of the present invention contains Component (A), Component (B), Component (C), and Component (D). The hair remover composition of the present invention contains at least one compound selected from the group consisting of Component (E) and Component (F). The hair remover composition of the present invention may contain Component (E), may contain Component (F), or may contain both Component (E) and Component (F).

[0027] In the hair remover composition of the present invention, since the above configuration is provided, skin irritation can be suppressed and emulsion stability can be enhanced.

[0028] The hair remover composition of the present invention may contain a polyhydric alcohol.

[0029] In this specification, the above-mentioned "polyhydric alcohol" may be referred to as "Component (G)".

[0030] The hair removal composition of the present invention may contain other components besides components (A) to (G).

[0031] Each of the above components, such as component (A), component (B), component (C), component (D), component (E), component (F), component (G), and other components, may be used individually or in combination of two or more.

[0032] In this specification, the content of each component refers to the total content of all components contained in the hair removal composition. For example, the content of component (C) refers to the total content of all components (C) in the hair removal composition.

[0033] The details of each component used in the hair removal composition of the present invention are described below.

[0034] (Component (A)) Component (A) is thioglycolic acid and / or a salt thereof. Component (A) is a hair removal component. The above hair removal composition may contain thioglycolic acid as component (A), may contain a thioglycolate, or may contain both thioglycolic acid and a thioglycolate. Component (A) may be used alone, or two or more may be used in combination.

[0035] Examples of the thioglycolate salts mentioned above include calcium thioglycolate, sodium thioglycolate, potassium thioglycolate, magnesium thioglycolate, ammonium thioglycolate, monoethanolamine thioglycolate, and triethanolamine thioglycolate.

[0036] In 100% by mass of the above hair removal composition, the content of component (A) on a thioglycolic acid structure basis is preferably 2.0% by mass or more, more preferably 2.5% by mass or more, preferably 5.0% by mass or less, and more preferably 4.0% by mass or less. If the content of component (A) on a thioglycolic acid structure basis is above the lower limit, the hair removal power can be further enhanced. If the content of component (A) on a thioglycolic acid structure basis is below the upper limit, the emulsion stability can be further enhanced, and skin irritation can be further suppressed.

[0037] The above thioglycolic acid content, calculated on a structural basis, refers to the content of thioglycolic acid if component (A) is thioglycolic acid, and the content expressed by the following formula if component (A) is a thioglycolate. Furthermore, if component (A) contains both thioglycolic acid and a thioglycolate, the above thioglycolic acid content, calculated on a structural basis, refers to the sum of the content of thioglycolic acid and the content expressed by the following formula.

[0038] Thioglycolate content (mass%) based on thioglycolic acid structure = Thioglycolate content (mass%) × (Molecular weight of thioglycolic acid / Molecular weight of thioglycolate)

[0039] (Component (B)) Component (B) is a hydrocarbon that is solid at 25°C. This solid does not include paste-like substances. Using component (B) can suppress skin irritation. Component (B) may be used alone or in combination of two or more types.

[0040] Components (B) include paraffin wax, microcrystalline wax, and polyethylene wax.

[0041] From the viewpoint of further suppressing skin irritation, component (B) is preferably paraffin wax.

[0042] In the above hair removal composition, the content of component (B) is preferably 1.0% by mass or more, more preferably 2.0% by mass or more, preferably 10.0% by mass or less, and more preferably 8.0% by mass or less. If the content of component (B) is above the lower limit, skin irritation can be further suppressed. If the content of component (B) is below the upper limit, emulsion stability can be further improved.

[0043] (Component (C)) Component (C) is a polyoxyethylene alkyl ether having an HLB value of 12.0 or higher and an average number of moles of ethylene oxide added of less than 100. Using component (C) can improve emulsification stability. Component (C) may be used alone or in combination of two or more types.

[0044] The HLB value of component (C) is 12.0 or higher. Preferably, the HLB value of component (C) is 14.0 or higher, more preferably 16.0 or higher, and preferably 20.0 or lower.

[0045] The average number of moles of ethylene oxide (EO) added to component (C) (the average number of moles of EO added to the polyoxyethylene portion) is less than 100. The average number of moles of ethylene oxide (EO) added to component (C) (the average number of moles of EO added to the polyoxyethylene portion) is preferably 10 or more, more preferably 15 or more, and preferably 50 or less. If the above average number of added moles is above the lower limit and below the upper limit, the emulsification stability can be further improved.

[0046] The number of carbon atoms in the alkyl group of component (C) is preferably 12 or more, more preferably 14 or more, even more preferably 16 or more, and preferably 22 or less. If the number of carbon atoms is above the lower limit and below the upper limit, the emulsification stability can be further enhanced.

[0047] Examples of component (C) include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene myristyl ether, polyoxyethylene octyldodecyl ether, and polyoxyethylene behenyl ether.

[0048] The mass ratio of the content of component (C) to the content of component (D) (content of component (C) / content of component (D)) is preferably 0.3 or more, more preferably 0.5 or more, preferably 8.0 or less, and more preferably 5.0 or less. When the above mass ratio (content of component (C) / content of component (D)) is above the lower limit and below the upper limit, the emulsification stability can be further enhanced.

[0049] In 100% by mass of the above hair removal composition, the content of component (C) is preferably 0.5% by mass or more, more preferably 0.7% by mass or more, even more preferably 1.0% by mass or more, preferably 5.0% by mass or less, and more preferably 4.0% by mass or less. If the content of component (C) is above the lower limit and below the upper limit, the emulsification stability can be further enhanced. Also, if the content of component (C) is below the upper limit, the manufacturing cost of the hair removal composition can be kept low.

[0050] (Component (D)) Component (D) is a polyoxyethylene alkyl ether with an HLB value of less than 12.0. Using component (D) can improve emulsion stability. Component (D) may be used alone or in combination of two or more types.

[0051] The HLB value of component (D) is less than 12.0. Preferably, the HLB value of component (D) is 11.0 or less, and more preferably 10.0 or less.

[0052] The average number of moles of ethylene oxide (EO) added to component (D) (the average number of moles of EO added to the polyoxyethylene portion) is preferably 1 or more, more preferably 2 or more, preferably 10 or less, and more preferably 8 or less. If the above average number of moles added is above the lower limit and below the upper limit, the emulsification stability can be further enhanced.

[0053] The number of carbon atoms in the alkyl group of component (D) is preferably 12 or more, more preferably 14 or more, even more preferably 16 or more, and preferably 22 or less. If the above number of carbon atoms is above the lower limit and below the upper limit, the emulsion stability can be further enhanced.

[0054] Examples of component (D) include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene myristyl ether, polyoxyethylene octyldodecyl ether, and polyoxyethylene behenyl ether.

[0055] In 100% by mass of the above hair removal composition, the content of component (D) is preferably 0.2% by mass or more, more preferably 0.4% by mass or more, preferably 5.0% by mass or less, and more preferably 2.0% by mass or less. When the content of component (D) is above the lower limit and below the upper limit, the emulsification stability can be further enhanced. Furthermore, when the content of component (D) is below the upper limit, the manufacturing cost of the hair removal composition can be kept low.

[0056] (Component (E)) Component (E) is polyoxyethylene alkyl ether phosphate and / or a salt thereof. The above hair removal composition preferably contains component (E). By using component (E), emulsion stability can be improved. In particular, by using component (E) in combination with components (C) and (D), emulsion stability can be significantly improved. Therefore, even when the hair removal composition is stored for a long period of time at room temperature, or when the hair removal composition is stored at high temperature, changes in the properties and viscosity of the hair removal composition can be suppressed. The above hair removal composition may contain polyoxyethylene alkyl ether phosphate as component (E), or it may contain polyoxyethylene alkyl ether phosphate, or it may contain both polyoxyethylene alkyl ether phosphate and polyoxyethylene alkyl ether phosphate. Component (E) may be used alone, or two or more may be used in combination.

[0057] Examples of the above-mentioned polyoxyethylene alkyl ether phosphates include polyoxyethylene lauryl ether phosphate, polyoxyethylene myristyl ether phosphate, polyoxyethylene cetyl ether phosphate, polyoxyethylene stearyl ether phosphate, and polyoxyethylene oleyl ether phosphate.

[0058] Examples of the above-mentioned polyoxyethylene alkyl ether phosphates include sodium polyoxyethylene lauryl ether phosphate, sodium polyoxyethylene cetyl ether phosphate, sodium polyoxyethylene oleyl ether phosphate, sodium polyoxyethylene alkylphenyl ether phosphate, and polyoxyethylene alkylphenyl ether phosphate triethanolamine.

[0059] From the viewpoint of further enhancing emulsification stability, it is preferable that component (E) contains polyoxyethylene cetyl ether phosphate and / or polyoxyethylene stearyl ether phosphate.

[0060] From the viewpoint of further improving emulsification stability, the average number of moles of ethylene oxide (EO) added to component (E) (average number of moles of EO added to the polyoxyethylene portion) is preferably 3 or more, more preferably 5 or more, preferably 60 or less, more preferably 40 or less, and even more preferably 25 or less.

[0061] From the viewpoint of further improving emulsification stability, the number of carbon atoms in the alkyl group of component (E) is preferably 12 or more, more preferably 14 or more, preferably 22 or less, and more preferably 20 or less.

[0062] In 100% by mass of the above hair removal composition, the content of component (E) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, preferably 1.0% by mass or less, and more preferably 0.5% by mass or less. If the content of component (E) is above the lower limit and below the upper limit, the emulsification stability can be further enhanced. If the content of component (E) is below the upper limit, the manufacturing cost of the hair removal composition can be kept low.

[0063] (Component (F)) Component (F) is a polyoxyethylene alkyl ether having an average number of moles of ethylene oxide added of 100 or more. The above hair removal composition preferably contains component (F). By using component (F), emulsion stability can be improved. In particular, by using component (F) in combination with components (C) and (D), emulsion stability can be significantly improved. Therefore, even when the hair removal composition is stored at room temperature for a long period of time, or when the hair removal composition is stored at high temperatures, changes in the properties and viscosity of the hair removal composition can be suppressed. Component (F) may be used alone, or two or more may be used in combination.

[0064] The average number of moles of ethylene oxide (EO) added to component (F) (the average number of moles of EO added to the polyoxyethylene portion) is 100 or more. Therefore, the HLB value of component (F) is 12.0 or more, and thus component (F) is different from component (D).

[0065] The average number of moles of ethylene oxide (EO) added to component (F) (the average number of moles of EO added to the polyoxyethylene portion) is preferably 120 or more, more preferably 140 or more, more preferably 220 or less, and more preferably 200 or less. If the above average number of moles added is above the lower limit and below the upper limit, the emulsification stability can be further enhanced.

[0066] The number of carbon atoms in the alkyl group of component (F) is preferably 12 or more, more preferably 14 or more, even more preferably 16 or more, and preferably 22 or less. If the above number of carbon atoms is above the lower limit and below the upper limit, the emulsion stability can be further enhanced.

[0067] Examples of component (F) include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene myristyl ether, polyoxyethylene octyldodecyl ether, and polyoxyethylene behenyl ether.

[0068] In the above hair removal composition, the content of component (F) is preferably 0.2% by mass or more, more preferably 0.5% by mass or more, preferably 3.0% by mass or less, and more preferably 2.0% by mass or less. When the content of component (F) is above the lower limit and below the upper limit, the emulsification stability can be further enhanced. In particular, when the content of component (F) is above the lower limit, changes in the viscosity of the hair removal composition can be effectively suppressed even when the hair removal composition is stored at room temperature for a long period of time. Furthermore, when the content of component (F) is below the upper limit, the manufacturing cost of the hair removal composition can be kept low.

[0069] In 100% by mass of the above hair removal composition, the total content of component (E) and component (F) is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.7% by mass or more, preferably 4.0% by mass or less, more preferably 3.0% by mass or less, and even more preferably 2.0% by mass or less. When the total content of component (E) and component (F) is above the lower limit and below the upper limit, the emulsification stability can be further enhanced. Furthermore, when the total content of component (E) and component (F) is below the upper limit, the manufacturing cost of the hair removal composition can be kept low.

[0070] (Component (G)) Component (G) is a polyhydric alcohol. The above hair removal composition preferably contains component (G). Using component (G) can enhance the moisturizing effect during use. Component (G) may be used alone, or two or more may be used in combination.

[0071] Examples of component (G) include ethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycol, 1,3-butylene glycol, glycerin, concentrated glycerin, diglycerin, triglycerin, 1,2-pentanediol, 1,2-hexanediol, and 1,2-octanediol.

[0072] In the above hair removal composition, the content of component (G) is preferably 1.0% by mass or more, more preferably 2.0% by mass or more, preferably 10.0% by mass or less, and more preferably 8.0% by mass or less. If the content of component (G) is above the lower limit, the moisturizing feeling during use can be further enhanced. If the content of component (G) is below the upper limit, the decrease in emulsion stability can be suppressed.

[0073] (Other ingredients) The above hair removal composition may contain other components besides the components (A) to (G) described above. Examples of these other components include higher alcohols; hydrocarbons that are liquid at 25°C; ester oils; fats and oils; silicone oils; hair removal promoting components; nonionic surfactants different from components (C), (D), and (F); anionic surfactants different from component (E); amphoteric surfactants; lower alcohols; thickeners; alkaline agents; cooling agents; preservatives; antioxidants; chelating agents; colorants; fragrances, etc. Each of these other components may be used individually or in combination of two or more.

[0074] <High-grade alcohol> The above hair removal composition may contain higher alcohols.

[0075] Examples of the above-mentioned higher alcohols include alcohols with 16 to 22 carbon atoms. Examples of alcohols with 16 to 22 carbon atoms include cetyl alcohol, stearyl alcohol, isostearyl alcohol, 2-octyldodecanol, oleyl alcohol, and behenyl alcohol.

[0076] In 100% by mass of the above hair removal composition, the content of the above higher alcohol is preferably 2.0% by mass or more, more preferably 4.0% by mass or more, preferably 15.0% by mass or less, and more preferably 10.0% by mass or less. When the content of the above higher alcohol is above the lower limit and below the upper limit, the viscosity of the hair removal composition can be further improved.

[0077] <Liquid hydrocarbons at 25°C> Examples of hydrocarbons that are liquid at 25°C include α-olefin oligomers, light isoparaffins, light liquid isoparaffins, squalane, synthetic squalane, plant-derived squalane, liquid isoparaffins, and liquid paraffins.

[0078] <Ester oil> Examples of the ester oils mentioned above include capric acid esters such as glyceryl caprate, caprylic acid esters such as glyceryl caprylate, cetyl 2-ethylhexanoate, and isononyl isononanoate.

[0079] <Oils> Examples of the above-mentioned oils and fats include olive oil, rice bran oil, castor oil, coconut oil, camellia oil, macadamia nut oil, sunflower oil, grape seed oil, and avocado oil.

[0080] <Silicone oil> Examples of the above-mentioned silicone oils include methylpolysiloxane, highly polymerized methylpolysiloxane, methylphenylpolysiloxane, dimethiconol, methylhydrogenpolysiloxane, alcohol-modified silicone, alkyl-modified silicone, and amino-modified silicone.

[0081] <Hair removal promoting ingredient> Examples of the hair removal promoting ingredients mentioned above include compounds represented by the following formula (1).

[0082] In this specification, the compound represented by formula (1) may be referred to as the hair removal promoting ingredient (X). By using the hair removal promoting ingredient (X), the hair removal power of ingredient (A) can be enhanced.

[0083] [ka]

[0084] In formula (1) above, R represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and n represents an integer between 2 and 5.

[0085] The alkyl group having 1 to 5 carbon atoms may be a linear alkyl group or an alkyl group having a branched structure.

[0086] In formula (1) above, R is preferably an alkyl group having 1 or 2 carbon atoms. That is, in formula (1) above, R is preferably a methyl group or an ethyl group. In this case, the hair removal promoting effect is exhibited more effectively, and the hair removal power can be further enhanced.

[0087] In the above formula (1), n ​​is preferably 2 or 3, and more preferably 2. In this case, the hair removal promoting effect is exerted more effectively, and the hair removal power is enhanced more effectively.

[0088] In the above hair removal composition, the content of the hair removal promoting component (X) is preferably 0.02% by mass or more, more preferably 0.1% by mass or more, and preferably 10.0% by mass or less. When the content of the hair removal promoting component (X) is above the lower limit, the hair removal promoting effect is exerted more effectively, and the hair removal power is further enhanced. When the content of the hair removal promoting component (X) is below the upper limit, the hair removal power can be increased while reducing skin irritation.

[0089] <Nonionic surfactants different from these three types: components (C), (D), and (F)> The above hair removal composition may also contain a nonionic surfactant (hereinafter sometimes referred to as nonionic surfactant (X)) different from these three types of components (C), (D), and (F).

[0090] Examples of nonionic surfactants (X) include polyoxyethylene hydrogenated castor oil.

[0091] Examples of the above-mentioned polyoxyethylene hydrogenated castor oil include polyoxyethylene hydrogenated castor oil in which the average number of moles of ethylene oxide (EO) added (average number of moles of EO added to the polyoxyethylene portion) is 30 or more and 80 or less.

[0092] <Anionic surfactant different from component (E)> The above hair removal composition may contain an anionic surfactant different from component (E) (hereinafter sometimes referred to as anionic surfactant (X)).

[0093] Anionic surfactants (X) include alkyl sulfate ester salts such as sodium lauryl sulfate, triethanolamine lauryl sulfate, sodium myristyl sulfate, sodium stearyl sulfate, sodium oleyl sulfate, and sodium cetyl sulfate; polyoxyethylene alkyl ether sulfates such as sodium polyoxyethylene lauryl ether sulfate and sodium polyoxyethylene myristyl ether sulfate; α-olefin sulfonates such as sodium tetradecenesulfonate; N-acyl methyl taurate salts such as sodium myristoyl methyl taurate, sodium palmitoyl methyl taurate, sodium stearoyl methyl taurate, sodium oleoyl methyl taurate, and sodium coconut oil fatty acid methyl taurate; alkyl sulfosuccinate salts such as sodium dioctyl sulfosuccinate and disodium lauryl sulfosuccinate; polyoxyethylene alkyl sulfosuccinate salts such as disodium polyoxyethylene lauryl sulfosuccinate; sodium lauryl phosphate Monoalkyl phosphate salts such as sodium cetyl phosphate and diethanolamine cetyl phosphate; N-acyl sarcosine salts such as potassium lauroyl sarcosinate, triethanolamine lauroyl sarcosinate, sodium myristoyl sarcosinate, and sodium coconut oil fatty acid sarcosinate; N-acyl-N-methyl-β-alanine salts such as sodium lauroyl methylalanine, triethanolamine lauroyl methylalanine, sodium myristoyl methylalanine, and sodium coconut oil fatty acid methylalanine; N-acyl glutamate salts such as sodium lauroyl glutamate, triethanolamine lauroyl glutamate, sodium myristoyl glutamate, potassium stearoyl glutamate, disodium stearoyl glutamate, sodium coconut oil fatty acid acyl glutamate, and triethanolamine coconut oil fatty acid acyl glutamate; N-acyl glycine salts such as potassium coconut oil fatty acid acylglycine and sodium coconut oil fatty acid acylglycine;Examples include alkyl ether glycol acetates such as sodium lauryl glycol acetate (dodecane-1,2-diol sodium acetate), potassium lauryl glycol acetate, sodium myristyl glycol acetate, potassium myristyl glycol acetate, sodium palmityl glycol acetate, potassium palmityl glycol acetate, sodium stearyl glycol acetate, potassium stearyl glycol acetate, sodium behenyl glycol acetate, and potassium behenyl glycol acetate.

[0094] <Amphoteric surfactants> The above amphoteric surfactants include alkylamide betaine type amphoteric surfactants such as lauric acid amidopropyl betaine and coconut oil fatty acid amidopropyl betaine; glycine type amphoteric surfactants such as alkylglycine salts, carboxymethylglycine salts, and N-acylaminoethyl-N-2-hydroxyethylglycine salt; aminopropionic acid type amphoteric surfactants such as alkylaminopropionate salts and alkyliminodipropionate salts; alkyldimethylaminoacetic acid betaine, alkylamidopropyldimethylaminoacetic acid betaine, and alkyldihydroxyethyl Examples include aminoacetic acid betaine-type amphoteric surfactants such as 0.aminoacetic acid betaine; sulfobetaine-type amphoteric surfactants such as alkylhydroxysulfobetaine; imidazolinium-type amphoteric surfactants such as alkylcarboxymethylhydroxyethylimidazolinium betaine; N-alkyl-N,N-dimethylammonium-N-propyl sulfonate; N-alkyl-N,N-dimethylammonium-N-(2-hydroxypropyl) sulfonate; and N-fatty acid amidopropyl-N,N-dimethylammonium-N-(2-hydroxypropyl) sulfonate.

[0095] <Lower alcohol> Examples of the lower alcohols mentioned above include ethanol.

[0096] <Thickening agent> Examples of the thickening agents mentioned above include xanthan gum, carboxyvinyl polymer, hydroxymethylcellulose, and hydroxypropylmethylcellulose. The carboxyvinyl polymer may also be an alkyl-modified carboxyvinyl polymer.

[0097] <Alkaline agent> The above hair removal composition preferably contains an alkaline agent.

[0098] Examples of the above-mentioned alkaline agents include sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonia, ammonium bicarbonate, ammonium carbonate, sodium bicarbonate, sodium carbonate, isopropanolamine, monoethanolamine, diethanolamine, triethanolamine, and 2-amino-2-methyl-1-propanol.

[0099] From the viewpoint of being easy to adjust to the pH required for the hair removal composition, the above alkaline agent is preferably an alkaline agent (at least one alkaline agent) selected from the group consisting of sodium hydroxide, potassium hydroxide, and calcium hydroxide.

[0100] In the above hair removal composition, the content of the alkaline agent is preferably 0.7% by mass or more, more preferably 0.8% by mass or more, and preferably 10.0% by mass or less. When the content of the alkaline agent is above the lower limit and below the upper limit, it becomes easier to adjust the pH of the hair removal composition to a suitable range, and the hair removal power can be further enhanced.

[0101] <Cooling agent> Examples of the cooling agents mentioned above include l-menthol, 1,8-cineole, and camphor.

[0102] <Preservatives> Examples of the above-mentioned preservatives include methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, and phenoxyethanol.

[0103] <Water> The above hair removal composition preferably contains water. The water is preferably purified water.

[0104] The water content in the above hair removal composition can be appropriately adjusted by the content of other components. The water content in 100% by mass of the above hair removal composition is preferably 60.0% by mass or more, more preferably 65.0% by mass or more, preferably 90.0% by mass or less, and more preferably 85.0% by mass or less.

[0105] (Other details about the hair removal agent composition) The properties of the above hair removal agent composition are not particularly limited. The properties of the above hair removal agent composition may be an emulsion, a cream, or a paste. From the viewpoint of exhibiting the effects of the present invention more effectively, the properties of the above hair removal agent composition are preferably an emulsion or a cream, and more preferably a cream. The above hair removal agent composition is preferably an emulsion hair removal agent composition or a cream hair removal agent composition, and more preferably a cream hair removal agent composition.

[0106] The pH of the above hair removal composition is preferably 12.0 or higher, more preferably 12.4 or higher, more preferably 13.0 or lower, and more preferably 12.8 or lower. If the pH is above the lower limit, the hair removal power can be further enhanced. If the pH is below the upper limit, skin irritation can be further suppressed.

[0107] The viscosity of the above hair removal composition immediately after manufacturing at 25°C is preferably 5000 mPa·s or more, more preferably 7000 mPa·s or more, even more preferably 10000 mPa·s or more, preferably 50000 mPa·s or less, more preferably 40000 mPa·s or less, and even more preferably 30000 mPa·s or less.

[0108] The viscosity described above is measured using a viscometer with a No. 4 rotor at a rotation speed of 12 rpm or 6 rpm and a rotation time of 1 minute. A TV-25 viscometer manufactured by Toki Sangyo Co., Ltd. can be used as the viscometer.

[0109] As a method for producing the above-mentioned hair removal agent composition, a known method for producing hair removal agent compositions can be employed. Examples of methods for producing the above-mentioned hair removal agent composition include a method of homogenizing each component by stirring it with a paddle mixer or the like.

[0110] The above-mentioned hair removal composition is not particularly limited, but can be used, for example, in a form contained in a container. If the hair removal composition has the properties of an emulsion or cream, the container is preferably a tube container. [Examples]

[0111] The present invention will be described in detail below with reference to examples and comparative examples. The present invention is not limited to the following examples.

[0112] The following components were used in the examples and comparative examples.

[0113] (Component (A)) Thioglycolic acid Calcium thioglycolate (thioglycolic acid structure conversion rate: 50.0%)

[0114] (Component (B)) Paraffin wax (PARAFFIN WAX-125, manufactured by Nippon Seiro Co., Ltd.)

[0115] (Component (C)) Polyoxyethylene cetyl ether (20 E.O.), average number of moles of ethylene oxide added: 20, HLB value (measured method): 17.0 Polyoxyethylene cetyl ether (40 E.O.), average number of moles of ethylene oxide added: 40, HLB value (measured method): 20.0

[0116] (Component (D)) Polyoxyethylene stearyl ether (5E.O.), average number of moles of ethylene oxide added: 5, HLB value (measured method): 9.2 Polyoxyethylene cetyl ether (5E.O.), average number of moles of ethylene oxide added: 5, HLB value (measured method): 9.4

[0117] (Component (E)) Polyoxyethylene cetyl ether phosphate (20 E.O.), average number of moles added of ethylene oxide: 20

[0118] (Component (F)) Polyoxyethylene cetyl ether (150 E.O.), average number of moles added of ethylene oxide: 150

[0119] (Component (G)) 1,3-Butylene glycol

[0120] (Other ingredients) Calcium hydroxide Sodium hydroxide Liquid paraffin (a hydrocarbon that is liquid at 25°C) Cetanol Stearyl alcohol Cetostearyl alcohol Sodium gluconate purified water

[0121] (Examples 1-13 and Comparative Examples 1-5) A hair removal agent composition was prepared by blending the ingredients shown in Tables 1-4 below (the blending unit is mass %). The blending amounts in the tables are shown as the pure content. Therefore, the content of calcium thioglycolate in terms of thioglycolic acid structure is 50% of the blending amount shown in the table. Also, the sodium hydroxide content in the table is the amount at which the pH of the hair removal agent composition becomes 12.5.

[0122] The hair removal compositions obtained in Examples 1-13 and Comparative Examples 1-5 were non-fluid, cream-like hair removal compositions.

[0123] (evaluation) The hair removal compositions obtained were evaluated as follows. The evaluations for Test Examples 1-3 were conducted by a panel of three experts, who deliberated and determined the evaluation results.

[0124] (Test example 1: Skin irritation) One mL of the resulting hair removal composition was applied to the necks of three expert panel members and left for 10 minutes. The intensity of pain during this time was evaluated according to the following criteria.

[0125] <Criteria for evaluating skin irritation> A: I don't feel pain. B: I feel some pain, but it's tolerable. C: Experiencing unbearable pain

[0126] (Test Example 2: Emulsification Stability (Long-Term Storage Stability)) The obtained hair removal agent composition was stored at 25°C for 3 months. The condition of the hair removal agent composition after storage was visually inspected.

[0127] <Evaluation Criteria for Emulsification Stability (Long-Term Storage Stability)> A: It has a non-fluid state (its properties have not changed compared to before storage, and it has good emulsification stability). B: Although the fluidity is slightly high, the properties are acceptable for use (emulsification stability is slightly good). C: High fluidity, which is a problematic property for use (poor emulsification stability).

[0128] (Test Example 3: Emulsification Stability (High Temperature Stability)) The obtained hair removal agent composition was stored at 50°C for 4 weeks. The condition of the hair removal agent composition after storage was visually inspected.

[0129] <Evaluation Criteria for Emulsification Stability (High Temperature Stability)> A: There is no change in properties before and after storage, or only a slight change (good emulsification stability). B: A slight separation of the aqueous layer is observed on the surface of the hair removal agent composition (emulsification stability is somewhat good). C: The hair removal agent composition has separated into two layers: an aqueous layer and an oil layer (poor emulsification stability).

[0130] The composition and results are shown in Tables 1-4 below.

[0131] [Table 1]

[0132] [Table 2]

[0133] [Table 3]

[0134] [Table 4]

Claims

1. It contains the following components A, B, C, and D: It contains at least one compound selected from the group consisting of the following components E and F, The content of component A, when calculated on a thioglycolic acid structure basis, is 2.0% by mass or more and 5.0% by mass or less. The content of component B is 1.0% by mass or more and 10.0% by mass or less. The content of component C is 0.5% by mass or more and 5.0% by mass or less. The content of component D is 0.2% by mass or more and 5.0% by mass or less. A hair removal composition in which the sum of the content of component E and the content of component F is 0.1% by mass or more and 4.0% by mass or less. Component A: Thioglycolic acid and / or its salt Component B: A hydrocarbon that is solid at 25°C. Component C: Polyoxyethylene alkyl ether with an HLB value of 12.0 or higher and an average number of moles of ethylene oxide added of less than 100. Component D: Polyoxyethylene alkyl ether with an HLB value of less than 12.0 Component E: Polyoxyethylene alkyl ether phosphate and / or its salt Component F: Polyoxyethylene alkyl ether with an average number of moles of ethylene oxide added of 100 or more.

2. The hair removal composition according to claim 1, wherein the pH is 12.0 or higher.

3. A hair removal composition according to claim 1 or 2, comprising the following component G. Ingredient G: Polyhydric alcohol

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