Depilatory composition

Abstract

To provide a depilatory composition capable of suppressing skin irritation and enhancing emulsification stability and depilatory efficacy.SOLUTION: There is provided a depilatory composition which comprises thioglycolic acid and / or its salt (component A), a polyoxyethylene cetyl ether having an HLB value of 10 or more and an average addition molar number of ethylene oxide of less than 100 (component B), a polyoxyethylene alkyl ether having an HLB value of 10 or more and an alkyl group having 18 or more carbon atoms (component C) and a polyoxyethylene alkyl ether having an HLB value of 7 or more and less than 10 in which the alkyl group is a straight-chain (component D), wherein the content of the component A in terms of thioglycolic acid structure is 2.0 mass% to 5.0 mass%, the mass molar concentration of calcium ions is 0.2 mol / kg to 0.9 mol / kg and the mass molar concentration of alkali metal ions is 0.2 mol / kg to 0.6 mol / kg.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Hair removal compositions containing thioglycolic acid and / or its salts as a depilatory ingredient are widely used. In these hair removal compositions, thioglycolic acid and / or its salts reduce the disulfide bonds in the keratin that constitutes body hair, thereby exerting a hair removal effect.

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

[0004] Patent Document 1 listed below discloses a hair removal agent containing thioglycolic acid or a thioglycolate salt and silicone oil.

[0005] Patent Document 2 listed below discloses a cream-type 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. This cream-type depilatory composition contains each of the above-mentioned components in specific amounts. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-246372 [Patent Document 2] Japanese Patent Application Publication No. 5-170624 Summary of the Invention [Problem to be solved by the invention]

[0007] The depilatory composition is typically used in the following manner: (1) Apply the depilatory composition to the skin surface where the body hair grows; (2) Leave the depilatory composition on the skin surface for several minutes to several tens of minutes; (3) Wash off the depilatory composition.

[0008] However, conventional depilatory compositions contain relatively large amounts of thioglycolic acid and / or its salts, or relatively large amounts of alkaline agents, which can cause severe skin irritation, and can cause pain or itching during use and after washing, or can cause severe redness on the skin after washing.

[0009] If the content of thioglycolic acid and / or a salt thereof or the content of the alkaline agent is simply reduced in order to suppress skin irritation, the hair removal power will decrease.

[0010] Therefore, it is difficult for conventional depilatory compositions to simultaneously suppress skin irritation and enhance hair removal power.

[0011] Furthermore, conventional depilatory compositions may not be able to sufficiently enhance emulsion stability, and in particular, it is difficult for conventional depilatory compositions to satisfactorily achieve the three effects of suppressing skin irritation, enhancing hair removal power, and enhancing emulsion stability.

[0012] The object of the present invention is to provide a method for preventing skin irritation, improving emulsion stability and hair removal power. The object of the present invention is to provide a hair removal composition that can [Means for solving the problem]

[0013] The present invention provides a hair removal composition comprising the following components (A), (B), (C), and (D), wherein the content of component (A) calculated as a thioglycolic acid structure is 2.0% by mass or more and 5.0% by mass or less, the molar concentration of calcium ions is 0.2 mol / kg or more and 0.9 mol / kg or less, and the molar concentration of alkali metal ions is 0.2 mol / kg or more and 0.6 mol / kg or less:

[0014] Component (A): Thioglycolic acid and / or its salt Component (B): Polyoxyethylene cetyl ether having an HLB value of 10 or more and an average number of moles of ethylene oxide added of less than 100 Component (C): Polyoxyethylene alkyl ether having an HLB value of 10 or more and an alkyl group having 18 or more carbon atoms Component (D): Polyoxyethylene alkyl ether having an HLB value of 7 or more and less than 10, and having a linear alkyl group

[0015] In the hair removal composition of the present invention, it is preferred that the content of component (B) is 1.0% by mass or more and 7.5% by mass or less, the content of component (C) is 1.0% by mass or more and 7.5% by mass or less, the content of component (D) is 0.1% by mass or more and 0.9% by mass or less, the total content of component (B) and component (C) is 2.0% by mass or more and 8.5% by mass or less, and the mass ratio of the content of component (B) to the total content of component (B) and component (C) is 0.2 or more and 0.7 or less.

[0016] The hair removal composition of the present invention contains the following component (E) and component (F), and it is preferred that the content of component (E) is 5.0% by mass or more and 15.0% by mass or less, and the content of component (F) is 3.0% by mass or more and 12.5% ​​by mass or less.

[0017] Component (E): Solid oil at 25°C Component (F): Liquid oil at 25°C

[0018] The depilatory composition of the present invention preferably has a pH of 11.0 or higher and 13.0 or lower. [Effects of the Invention]

[0019] The depilatory composition of the present invention contains specific component (A), specific component (B), specific component (C), and specific component (D). In the depilatory composition of the present invention, the content of component (A) calculated as a thioglycolic acid structure is 2.0% by mass or more and 5.0% by mass or less, the molar concentration of calcium ions is 0.2 mol / kg or more and 0.9 mol / kg or less, and the molar concentration of alkali metal ions is 0.2 mol / kg or more and 0.6 mol / kg or less. Because the depilatory composition of the present invention has the above-mentioned configuration, it is possible to suppress skin irritation and to improve emulsion stability and depilatory power. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be described in detail below.

[0021] The hair removal composition of the present invention comprises "thioglycolic acid and / or a salt thereof," "a polyoxyethylene cetyl ether having an HLB value of 10 or more and an average number of moles of ethylene oxide added of less than 100," "a polyoxyethylene alkyl ether having an HLB value of 10 or more and an alkyl group having 18 or more carbon atoms," and "a polyoxyethylene alkyl ether having an HLB value of 7 or more and an average number of moles of ethylene oxide added of less than 10." and the alkyl group is linear."

[0022] In this specification, the above-mentioned "thioglycolic acid and / or a salt thereof" may be referred to as "component (A)."

[0023] In this specification, the above-mentioned "polyoxyethylene cetyl ether having an HLB value of 10 or more and an average number of moles of ethylene oxide added of less than 100" may be referred to as "component (B)".

[0024] In this specification, the above-mentioned "polyoxyethylene alkyl ether having an HLB value of 10 or more and an alkyl group having 18 or more carbon atoms" may be referred to as "component (C)".

[0025] In this specification, the above-mentioned "polyoxyethylene alkyl ether having an HLB value of 7 or more and less than 10 and in which the alkyl group is linear" may be referred to as "component (D)".

[0026] Therefore, the depilatory composition of the present invention contains component (A), component (B), component (C), and component (D).

[0027] In the depilatory composition of the present invention, the content of component (A) calculated as a thioglycolic acid structure is 2.0% by mass or more and 5.0% by mass or less.

[0028] In the depilatory composition of the present invention, the molar concentration of calcium ions is 0.2 mol / kg or more and 0.9 mol / kg or less, and the molar concentration of alkali metal ions is 0.2 mol / kg or more and 0.6 mol / kg or less.

[0029] The hair removal composition of the present invention has the above-mentioned features, and therefore can suppress skin irritation and enhance emulsion stability and hair removal power.

[0030] The depilatory composition of the present invention may contain an oil that is solid at 25°C.

[0031] In this specification, the above-mentioned "oil agent that is solid at 25°C" may be referred to as "component (E)."

[0032] The depilatory composition of the present invention may contain an oil that is liquid at 25°C.

[0033] In this specification, the above-mentioned "oil agent that is liquid at 25°C" may be referred to as "component (F)."

[0034] The depilatory composition of the present invention may contain other components in addition to the components (A) to (F).

[0035] The above components, for example, component (A), component (B), component (C), component (D), component (E), component (F), and other components, may each be used alone or in combination of two or more.

[0036] In this specification, the content of each component refers to the total content of all of the components contained in the depilatory composition. For example, the content of component (B) refers to the total content of all components (B) in the depilatory composition.

[0037] In this specification, the HLB values ​​of the components (B), (C) and (D) are determined, for example, by an actual measurement method.

[0038] Hereinafter, each component used in the depilatory composition of the present invention will be described in detail.

[0039] (Component (A)) Component (A) is thioglycolic acid and / or a salt thereof. Component (A) is a depilatory component. The depilatory composition may contain thioglycolic acid, a thioglycolic acid salt, or both thioglycolic acid and a thioglycolic acid salt as component (A). Only one type of component (A) may be used, or two or more types may be used in combination.

[0040] Examples of the thioglycolate include calcium thioglycolate, sodium thioglycolate, potassium thioglycolate, magnesium thioglycolate, ammonium thioglycolate, monoethanolamine thioglycolate, and triethanolamine thioglycolate.

[0041] In order to achieve the effects of the present invention, the content of component (A) calculated as a thioglycolic acid structure in 100% by mass of the depilatory composition is 2.0% by mass or more and 5.0% by mass or less.

[0042] In 100% by mass of the above hair removal composition, the content of component (A) calculated as a thioglycolic acid structure is preferably 2.5% by mass or more, more preferably 3.0% by mass or more, and preferably 4.5% by mass or less, more preferably 4.0% by mass or less. When the content of component (A) calculated as a thioglycolic acid structure is equal to or greater than the above lower limit, the hair removal effect can be further enhanced. When the content of component (A) calculated as a thioglycolic acid structure is equal to or less than the above upper limit, the emulsion stability can be further enhanced and skin irritation can be further suppressed.

[0043] The above content in terms of thioglycolic acid structures means the content of thioglycolic acid when component (A) is thioglycolic acid, and means the content represented by the following formula when component (A) is a thioglycolic acid salt: Furthermore, when component (A) contains both thioglycolic acid and a thioglycolic acid salt, the above content in terms of thioglycolic acid structures means the sum of the content of thioglycolic acid and the content represented by the following formula:

[0044] Thioglycolic acid salt content (mass%) converted into thioglycolic acid structure = Thioglycolic acid salt content (mass%) × (Molecular weight of thioglycolic acid / Molecular weight of thioglycolic acid salt)

[0045] (Component (B)) Component (B) is a polyoxyethylene cetyl ether having an HLB value of 10 or more and an average number of moles of ethylene oxide added of less than 100. By using component (B), skin irritation can be suppressed and emulsion stability can be improved. Since component (B) is polyoxyethylene cetyl ether, the alkyl group of component (B) has 16 carbon atoms. Only one type of component (B) may be used, or two or more types may be used in combination.

[0046] The HLB value of component (B) is at least 10. The HLB value of component (B) is preferably at least 12, more preferably at least 14, and preferably at most 20, more preferably at most 18. When the HLB value is at least the above lower limit and at most the above upper limit, skin irritation can be further suppressed.

[0047] The average number of moles of ethylene oxide (EO) added in component (B) (average number of moles of EO added in polyoxyethylene moieties) is less than 100. The average number of moles of ethylene oxide (EO) added in component (B) (average number of moles of EO added in polyoxyethylene moieties) is preferably 10 or more, more preferably 15 or more, and preferably 75 or less, more preferably 50 or less. When the average number of moles added is equal to or more than the above lower limit and equal to or less than the above upper limit, skin irritation can be further suppressed and emulsion stability can be further improved.

[0048] The content of component (B) in the above hair removal composition (100% by mass) is preferably 1.0% by mass or more, more preferably 1.5% by mass or more, even more preferably 2.0% by mass or more, and preferably 7.5% by mass or less, more preferably 6.5% by mass or less, and even more preferably 5.5% by mass or less. When the content of component (B) is equal to or greater than the above lower limit, skin irritation can be further suppressed. When the content of component (B) is equal to or less than the above upper limit, emulsion stability can be further improved.

[0049] In the above hair removal composition (100% by mass), the total content of component (B) and component (C) is preferably 2.0% by mass or more, more preferably 3.0% by mass or more, even more preferably 4.0% by mass or more, and preferably 8.5% by mass or less, more preferably 7.0% by mass or less, and even more preferably 6.5% by mass or less. When the total content is equal to or greater than the above lower limit, emulsion stability can be further improved. When the total content is equal to or less than the above upper limit, skin irritation can be further suppressed.

[0050] The mass ratio of the content of component (B) to the total content of component (B) and component (C) (content of component (B) / total content of component (B) and component (C)) is preferably 0.2 or more, more preferably 0.3 or more, even more preferably 0.4 or more, and preferably 0.7 or less, more preferably 0.6 or less. When this mass ratio (content of component (B) / total content of component (B) and component (C)) is equal to or greater than the above lower limit, skin irritation can be further suppressed. When this mass ratio (content of component (B) / total content of component (B) and component (C)) is equal to or less than the above upper limit, emulsion stability can be further improved.

[0051] (Component (C)) Component (C) is a polyoxyethylene alkyl ether having an HLB value of 10 or more and an alkyl group having 18 or more carbon atoms. By using component (C), skin irritation can be suppressed and emulsion stability can be improved. Component (C) may be used alone or in combination of two or more types.

[0052] The HLB value of component (C) is at least 10. The HLB value of component (C) is preferably at least 11, more preferably at least 12, and preferably at most 20, more preferably at most 18. When the HLB value is at least the above lower limit and at most the above upper limit, skin irritation can be further suppressed and emulsion stability can be further improved.

[0053] The number of carbon atoms in the alkyl group of component (C) is at least 18. The number of carbon atoms in the alkyl group of component (C) is preferably at most 22, more preferably at most 20. When the number of carbon atoms is at most the upper limit, emulsion stability can be further improved.

[0054] The alkyl group of component (C) may be linear or have a branched structure.

[0055] The average number of moles of ethylene oxide (EO) added in component (C) (average number of moles of EO added in the polyoxyethylene moiety) is preferably 7 or more, more preferably 10 or more, and preferably 65 or less, more preferably 50 or less. When the content is below the limit, skin irritation can be further suppressed.

[0056] Examples of component (C) include polyoxyethylene stearyl ether (20 E.O.) (HLB value: 15), polyoxyethylene behenyl ether (10 E.O.) (HLB value: 12), polyoxyethylene isostearyl ether (16 E.O.) (HLB value: 14), and polyoxyethylene stearyl ether (50 E.O.) (HLB value: 18).

[0057] The content of component (C) in the above hair removal composition (100% by mass) is preferably 1.0% by mass or more, more preferably 1.5% by mass or more, even more preferably 2.0% by mass or more, and preferably 7.5% by mass or less, more preferably 6.5% by mass or less, and even more preferably 5.5% by mass or less. When the content of component (C) is equal to or greater than the above lower limit, emulsion stability can be further improved. When the content of component (C) is equal to or less than the above upper limit, skin irritation can be further suppressed.

[0058] (Component (D)) Component (D) is a polyoxyethylene alkyl ether having an HLB value of 7 or more and less than 10, and in which the alkyl group is linear. By using component (D), skin irritation can be suppressed. Component (D) may be used alone or in combination of two or more types.

[0059] The HLB value of component (D) is 7 or more and less than 10. The HLB value of component (D) is preferably 8 or more, more preferably 9 or more. When the HLB value is equal to or more than the above lower limit, skin irritation can be further suppressed.

[0060] The alkyl group of component (D) is linear. Component (D) has a linear alkyl group.

[0061] The number of carbon atoms in the alkyl group of component (D) is preferably 14 or more, more preferably 16 or more, and preferably 22 or less, more preferably 18 or less. When the number of carbon atoms is equal to or more than the above lower limit and equal to or less than the above upper limit, skin irritation can be further suppressed.

[0062] The average number of moles of ethylene oxide (EO) added in component (D) (average number of moles of EO added in the polyoxyethylene moiety) is preferably at least 1, more preferably at least 2, and preferably at most 7, more preferably at most 6. When the average number of moles added is at least the above lower limit and at most the above upper limit, skin irritation can be further suppressed.

[0063] Examples of component (D) include polyoxyethylene cetyl ether (5E.O.) (HLB value: 9), polyoxyethylene stearyl ether (5E.O.) (HLB value: 9), and polyoxyethylene behenyl ether (5E.O.) (HLB value: 8).

[0064] The content of component (D) in the above hair removal composition (100% by mass) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, and preferably 0.9% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.7% by mass or less. When the content of component (D) is equal to or more than the above lower limit and equal to or less than the above upper limit, skin irritation can be further suppressed.

[0065] (Component (E)) Component (E) is an oil that is solid at 25°C. The solid does not include a paste. The hair removal composition preferably contains component (E). By using component (E), skin irritation can be further suppressed and emulsion stability can be further improved. Only one type of component (E) may be used, or two or more types may be used in combination.

[0066] Examples of the component (E) include hydrocarbons, higher alcohols, ester oils, and animal and vegetable oils.

[0067] Examples of the hydrocarbons (hydrocarbons that are solid at 25° C.) include paraffin wax, microcrystalline wax, and polyethylene wax.

[0068] Examples of the higher alcohols (higher alcohols that are solid at 25°C) include alcohols having 16 to 22 carbon atoms. Examples of the alcohols having 16 to 22 carbon atoms (higher alcohols that are solid at 25°C) include cetyl alcohol, stearyl alcohol, arachyl alcohol, and behenyl alcohol.

[0069] Examples of the ester oil (ester oil that is solid at 25°C) include caprylic / capric / myristic / stearic triglyceride, dipentaerythrityl hexahydroxystearate, ethyl stearate, myristyl myristate, cholesteryl isostearate, dipentaerythrityl hexa(hydroxystearate / stearate / rosinate), and dipentaerythrityl tetra(hydroxystearate / isostearate).

[0070] Examples of the animal and vegetable oils (solid animal and vegetable oils at 25° C.) include carnauba wax, sunflower seed wax, candelilla wax, beeswax, rice bran wax, shellac wax, and spermaceti wax.

[0071] Component (E) preferably contains an oil that is solid at 25°C (at least one oil that is solid at 25°C) selected from the group consisting of hydrocarbons and higher alcohols. In this case, skin irritation can be further suppressed.

[0072] In this specification, the above-mentioned "oil agent that is solid at 25° C. and is selected from the group consisting of hydrocarbons and higher alcohols" may be referred to as "component (E1)".

[0073] Therefore, it is preferable that component (E) contains component (E1).The above-mentioned depilatory composition preferably contains component (E1).

[0074] From the viewpoint of further suppressing skin irritation, the hydrocarbon (a hydrocarbon that is solid at 25°C) is preferably paraffin wax, and the higher alcohol (a higher alcohol that is solid at 25°C) is preferably stearyl alcohol.

[0075] The content of component (E1) in the above hair removal composition (100% by mass) is preferably 5.0% by mass or more, more preferably 5.5% by mass or more, even more preferably 6.0% by mass or more, and preferably 15.0% by mass or less, more preferably 12.0% by mass or less, and even more preferably 10.0% by mass or less. When the content of component (E1) is equal to or greater than the above lower limit and equal to or less than the above upper limit, emulsion stability can be further improved and skin irritation can be further suppressed.

[0076] The content of component (E) in the above hair removal composition (100% by mass) is preferably 5.0% by mass or more, more preferably 5.5% by mass or more, even more preferably 6.0% by mass or more, and preferably 15.0% by mass or less, more preferably 12.0% by mass or less, and even more preferably 10.0% by mass or less. When the content of component (E) is equal to or greater than the above lower limit and equal to or less than the above upper limit, emulsion stability can be further improved and skin irritation can be further suppressed.

[0077] (Component (F)) Component (F) is an oil that is liquid at 25°C. The term "liquid at 25°C" means that the depilatory composition has fluidity at 25°C. The depilatory composition preferably contains component (F). By using component (F), skin irritation can be further suppressed and emulsion stability can be further improved. Only one type of component (F) may be used, or two or more types may be used in combination.

[0078] Examples of the component (F) include hydrocarbons, higher alcohols, vegetable oils, ester oils, and silicone oils.

[0079] Examples of the hydrocarbons (hydrocarbons that are liquid at 25° C.) include α-olefin oligomers, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, and liquid paraffin.

[0080] Examples of the higher alcohols (higher alcohols that are liquid at 25°C) include alcohols having 16 to 22 carbon atoms. Examples of the alcohols having 16 to 22 carbon atoms (higher alcohols that are liquid at 25°C) include isostearyl alcohol, 2-octyldodecanol, oleyl alcohol, 2-hexyldecanol, and 2-decyltetradecanol.

[0081] Examples of the vegetable oils (vegetable oils that are liquid at 25°C) include castor oil, macadamia nut oil, eucalyptus oil, coconut oil, avocado oil, safflower oil, olive oil, palm oil, palm kernel oil, kukui nut oil, liquid shea butter, almond oil, sunflower oil, rosehip oil, olive squalane, camellia oil, kiwi fruit seed oil, camellia oil, apricot kernel oil, sesame oil, soybean oil, jojoba oil, hazelnut oil, medlar oil, peppermint oil, argan oil, carrot oil, lavender oil, sugar squalane, crambe abyssinica seed oil, and hydrogenated products thereof (for example, hydrogenated castor oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, and hydrogenated soybean oil).

[0082] The above ester oils (ester oils that are liquid at 25°C) include ethyl oleate, isopropyl myristate, isopropyl palmitate, oleyl oleate, octyldodecyl myristate, octyldodecyl oleate, tridecyl myristate, ethyl isostearate, isopropyl isostearate, propylene glycol isostearate, cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate (trioctanoin), caprylic / capric triglyceride, ) glyceryl, glyceryl triisopalmitate, pentaerythritol tetra-2-ethylhexanoate, diisopropyl adipate, isocetyl octanoate, isostearyl octanoate, isocetyl isostearate, octyldodecyl isostearate, octyldodecyl dimethyloctanoate, isononyl isononanoate, tridecyl isononanoate, pentaerythrityl tetraoctanoate, pentaerythrityl tetraisostearate, diisostearyl malate, and 2-ethylhexyl palmitate.

[0083] Examples of the silicone oil (liquid silicone oil at 25°C) include methylpolysiloxane, highly polymerized methylpolysiloxane, methylphenylpolysiloxane, dimethiconol, methylhydrogenpolysiloxane, alcohol-modified silicone, alkyl-modified silicone, and amino-modified silicone.

[0084] Component (F) preferably contains an oil that is liquid at 25°C (at least one oil that is liquid at 25°C) selected from the group consisting of hydrocarbons and higher alcohols. In this case, skin irritation can be further suppressed.

[0085] In this specification, the above-mentioned "oil agent that is liquid at 25° C. and is selected from the group consisting of hydrocarbons and higher alcohols" may be referred to as "component (F1)".

[0086] Therefore, it is preferable that component (F) contains component (F1).The above depilatory composition preferably contains component (F1).

[0087] From the viewpoint of further suppressing skin irritation, the hydrocarbon (a hydrocarbon that is liquid at 25°C) is preferably liquid paraffin, and the higher alcohol (a higher alcohol that is liquid at 25°C) is preferably oleyl alcohol.

[0088] The content of component (F1) in the above hair removal composition (100% by mass) is preferably 3.0% by mass or more, more preferably 3.5% by mass or more, even more preferably 4.0% by mass or more, and preferably 12.5% ​​by mass or less, more preferably 10.0% by mass or less, and even more preferably 8.0% by mass or less. When the content of component (F1) is equal to or greater than the above lower limit and equal to or less than the above upper limit, emulsion stability can be further improved and skin irritation can be further suppressed.

[0089] The content of component (F) in the above hair removal composition (100% by mass) is preferably 3.0% by mass or more, more preferably 3.5% by mass or more, even more preferably 4.0% by mass or more, and preferably 12.5% ​​by mass or less, more preferably 10.0% by mass or less, and even more preferably 8.0% by mass or less. When the content of component (F) is equal to or greater than the above lower limit and equal to or less than the above upper limit, emulsion stability can be further improved and skin irritation can be further suppressed.

[0090] (Other ingredients) The depilatory composition may contain other components in addition to the above-mentioned components (A) to (F). Examples of such other components include a hair removal promoting component; a nonionic surfactant other than the three components (B), (C), and (D); anionic surfactants; amphoteric surfactants; lower alcohols; thickeners; alkaline agents; polyhydric alcohols; refreshing agents; preservatives; antioxidants; sequestering agents; colorants; and fragrances. Only one of each of the above other components may be used, or two or more may be used in combination.

[0091] <Hair removal promoting ingredient> The depilatory composition may contain a hair removal promoting ingredient, such as a compound represented by the following formula (1):

[0092] In this specification, the above "compound represented by formula (1)" may be referred to as "hair removal promoting ingredient (X)." By using the hair removal promoting ingredient (X), the hair removal power of ingredient (A) can be enhanced.

[0093] [ka]

[0094] In the above formula (1), R represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 5.

[0095] The alkyl group having 1 to 5 carbon atoms may be a linear alkyl group or an alkyl group having a branched structure.

[0096] In the above formula (1), R is preferably an alkyl group having 1 or 2 carbon atoms. That is, in the above formula (1), R is preferably a methyl group or an ethyl group. In this case, the hair removal promoting effect is more effectively exerted, and the hair removal power can be further increased.

[0097] In the above formula (1), n ​​is preferably 2 or 3, and more preferably 2. In this case, the hair removal promoting effect is more effectively exerted, and the hair removal power is more effectively increased.

[0098] The content of the hair removal promoting ingredient (X) in the above-mentioned depilatory composition (100% by mass) 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 ingredient (X) is equal to or greater than the above-mentioned lower limit, the hair removal promoting effect is more effectively exerted, and the hair removal power is more effectively enhanced. When the content of the hair removal promoting ingredient (X) is equal to or less than the above-mentioned upper limit, the hair removal power can be enhanced and skin irritation can be reduced.

[0099] <Nonionic surfactants different from the three components (B), (C), and (D)> The above-mentioned depilatory composition may contain a nonionic surfactant (hereinafter, sometimes referred to as nonionic surfactant (Y)) different from the three components (B), (C), and (D).

[0100] Examples of the nonionic surfactant (Y) include polyoxyethylene hydrogenated castor oil.

[0101] Examples of the polyoxyethylene hydrogenated castor oil include polyoxyethylene hydrogenated castor oil having an average number of moles of ethylene oxide (EO) added (average number of moles of EO added in the polyoxyethylene portion) of 30 or more and 80 or less.

[0102] <Anionic surfactants> The depilatory composition may contain an anionic surfactant.

[0103] Examples of the anionic surfactants include alkyl sulfates 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 tetradecene sulfonate; N-acyl methyl taurine 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 sulfosuccinates such as dioctyl sodium sulfosuccinate and disodium lauryl sulfosuccinate; and polyoxyethylene lauryl sulfosuccinate. polyoxyethylene alkyl salts of sulfosuccinate such as disodium; monoalkyl phosphate salts such as sodium lauryl phosphate, sodium cetyl phosphate, and diethanolamine cetyl phosphate; polyoxyethylene alkyl ether phosphates such as polyoxyethylene lauryl ether phosphate, polyoxyethylene myristyl ether phosphate, polyoxyethylene cetyl ether phosphate, polyoxyethylene stearyl ether phosphate, and polyoxyethylene oleyl ether phosphate; polyoxyethylene alkyl ether phosphates such as sodium polyoxyethylene lauryl ether phosphate, sodium polyoxyethylene cetyl ether phosphate, sodium polyoxyethylene oleyl ether phosphate, sodium polyoxyethylene alkylphenyl ether phosphate, and polyoxyethylene alkylphenyl ether triethanolamine phosphate; potassium lauroyl sarcosinate N-acyl sarcosine salts such as lauroyl sarcosine triethanolamine, myristoyl sarcosine sodium, and coconut oil fatty acid sarcosine sodium; N-acyl-N-methyl-β-alanine salts such as lauroyl methyl alanine sodium, lauroyl methyl alanine triethanolamine, myristoyl methyl alanine sodium, and coconut oil fatty acid methyl alanine sodium; sodium lauroyl glutamate, lauroyl glutamic acid triethanolamine, sodium myristoyl glutamate, potassium stearoyl glutamate, disodium stearoyl glutamate, coconut oil fatty acid acyl glutamate, and coconut oil fatty acid acyl glutamate. N-acylglutamates such as triethanolamine hydroxylase; N-acylglycine salts such as potassium coconut oil fatty acid acylglycine and sodium coconut oil fatty acid acylglycine; alkyl ether glycol acetates such as sodium lauryl glycol acetate (sodium dodecane-1,2-diol 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.

[0104] <Amphoteric surfactant> The depilatory composition may contain an amphoteric surfactant.

[0105] Examples of the amphoteric surfactant include alkylamidobetaine-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 salts; aminopropionic acid-type amphoteric surfactants such as alkylaminopropionates and alkyliminodipropionates; alkyldimethylaminoacetic acid betaine, alkylamidopropyldimethylaminoacetic acid betaine, and alkyldihydroxyethyl aminoacetic acid betaine-type amphoteric surfactants such as alkylaminoacetic 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.

[0106] <Lower alcohol> The depilatory composition may contain a lower alcohol.

[0107] The lower alcohol includes ethanol.

[0108] <Thickener> The depilatory composition may contain a thickener.

[0109] Examples of the thickener include xanthan gum, carboxyvinyl polymer, hydroxymethyl cellulose, and hydroxypropyl methyl cellulose. The carboxyvinyl polymer may be an alkyl-modified carboxyvinyl polymer.

[0110] <Alkaline agent> The above-mentioned depilatory composition preferably contains an alkaline agent.

[0111] The alkaline agent may be sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonia, ammonium hydrogen carbonate, ammonium carbonate, sodium hydrogen carbonate, or sodium carbonate. ethanolamine, isopropanolamine, monoethanolamine, diethanolamine, triethanolamine, and 2-amino-2-methyl-1-propanol.

[0112] The 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, as this makes it easier to adjust the pH of the depilatory composition.

[0113] The alkaline agent is preferably an alkaline agent (at least one alkaline agent) selected from the group consisting of potassium hydroxide and calcium hydroxide, as this makes it easier to adjust the pH of the hair removal composition, as well as the molar mass concentration of calcium ions and the molar mass concentration of alkali metal ions in the hair removal composition.

[0114] The alkaline agent preferably contains potassium hydroxide and calcium hydroxide, and more preferably potassium hydroxide and calcium hydroxide, because this makes it easier to adjust the pH of the depilatory composition, as well as the molar concentrations of calcium ions and alkali metal ions in the depilatory composition.

[0115] The content of the alkaline agent in 100% by mass of the hair depilatory composition 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 equal to or greater than the above-mentioned lower limit and equal to or less than the above-mentioned upper limit, it becomes easier to adjust the pH of the hair depilatory composition within a suitable range, and the hair removal effect can be further enhanced.

[0116] <Polyhydric alcohol> The depilatory composition may contain a polyhydric alcohol.

[0117] Examples of the polyhydric alcohol 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.

[0118] The content of the polyhydric alcohol in the hair removal composition (100% by mass) is preferably 1.0% by mass or more, more preferably 2.0% by mass or more, and preferably 10.0% by mass or less, more preferably 8.0% by mass or less. When the content of the polyhydric alcohol is equal to or greater than the lower limit, the moisturizing feeling during use can be further enhanced. When the content of the polyhydric alcohol is equal to or less than the upper limit, a decrease in emulsion stability can be suppressed.

[0119] <Refreshing agent> The depilatory composition may contain a cooling agent.

[0120] Examples of the cooling agent include 1-menthol, 1,8-cineole, and camphor.

[0121] <Preservatives> The depilatory composition may contain a preservative.

[0122] Examples of the preservative include methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, and phenoxyethanol.

[0123] <Water> The hair removal composition preferably contains water, and the water is preferably purified water.

[0124] The water content in the depilatory composition can be adjusted as appropriate depending on the contents of other ingredients. The water content in 100% by mass of the depilatory composition is preferably 60.0% by mass or more, more preferably 65.0% by mass or more, and preferably 90.0% by mass or less, more preferably 85.0% by mass or less.

[0125] (Other Details of the Depilatory Composition) From the viewpoint of suppressing skin irritation and enhancing hair removal power, the hair remover composition has a calcium ion molar concentration of 0.2 mol / kg or more and 0.9 mol / kg or less.

[0126] In the hair removal composition, the calcium ion molar concentration is preferably 0.3 mol / kg or more, more preferably 0.4 mol / kg or more, and preferably 0.8 mol / kg or less, more preferably 0.7 mol / kg or less. When the calcium ion molar concentration is equal to or greater than the lower limit, the hair removal effect can be further enhanced. When the calcium ion molar concentration is equal to or less than the upper limit, skin irritation can be further suppressed.

[0127] From the viewpoint of suppressing skin irritation and enhancing hair removal power, the above-mentioned hair remover composition has an alkali metal ion molar concentration of 0.2 mol / kg or more and 0.6 mol / kg or less.

[0128] In the above hair removal composition, the mass molar concentration of the alkali metal ion is preferably 0.3 mol / kg or more, and preferably 0.5 mol / kg or less. When the mass molar concentration of the alkali metal ion is equal to or more than the above lower limit, the hair removal effect can be further enhanced. When the mass molar concentration of the alkali metal ion is equal to or less than the above upper limit, skin irritation can be further suppressed.

[0129] From the viewpoint of further suppressing skin irritation, the alkali metal ions preferably include potassium ions. When the alkali metal ions include potassium ions, the potassium ion mass molar concentration in the hair removal composition is preferably 0.2 mol / kg or more, more preferably 0.3 mol / kg or more, preferably 0.6 mol / kg or less, more preferably 0.5 mol / kg or less. When the potassium ion mass molar concentration is equal to or greater than the lower limit, the hair removal power can be further enhanced. When the potassium ion mass molar concentration is equal to or less than the upper limit, skin irritation can be further suppressed.

[0130] The molar mass concentration of the calcium ions, the molar mass concentration of the alkali metal ions, and the molar mass concentration of the potassium ions can be adjusted, for example, by appropriately adjusting the type and content of the alkaline agent, by using a calcium salt or a potassium salt as component (A), or by appropriately adjusting the content of component (A) which is a calcium salt or a potassium salt.

[0131] The pH of the depilatory composition is preferably 11.0 or higher, more preferably 12.0 or higher, and preferably 13.0 or lower, more preferably 12.8 or lower. When the pH is equal to or higher than the lower limit, the depilatory effect can be further enhanced. When the pH is equal to or lower than the upper limit, skin irritation can be further suppressed.

[0132] The viscosity of the hair removal composition at 25°C immediately after production is preferably 5000 mPa·s or more, more preferably 7000 mPa·s or more, and even more preferably 10000 mPa·s or more. The viscosity is preferably 50,000 mPa·s or less, more preferably 40,000 mPa·s or less, and even more preferably 30,000 mPa·s or less.

[0133] The viscosity is measured using a viscometer with a No. 4 rotor at a rotation speed of 12 rpm or 6 rpm for a rotation time of 1 minute. The viscometer may be a TV-25 viscometer manufactured by Toki Sangyo Co., Ltd.

[0134] The properties of the hair depilatory composition are not particularly limited. The properties of the hair depilatory composition may be emulsion-like, cream-like, or paste-like. From the viewpoint of more effectively exerting the effects of the present invention, the properties of the hair depilatory composition are preferably emulsion-like or cream-like, and more preferably cream-like. The hair depilatory composition is preferably an emulsion-like or cream-like hair depilatory composition, and more preferably a cream-like hair depilatory composition.

[0135] The depilatory composition can be produced by any known method for producing a depilatory composition, including a method in which the components are stirred and homogenized using a paddle mixer or the like.

[0136] The hair removal composition is not particularly limited, and can be used, for example, in a form contained in a container. When the hair removal composition is in the form of a milky lotion or cream, the container is preferably a tube container. [Example]

[0137] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0138] In the examples and comparative examples, the following components were used.

[0139] (Component (A)) Thioglycolic acid

[0140] (Component (B)) Polyoxyethylene cetyl ether (20E.O.), average number of ethylene oxide moles added: 20, HLB value (measured): 16 Polyoxyethylene cetyl ether (40E.O.), average number of ethylene oxide moles added: 40, HLB value (measured): 17

[0141] (Component (C)) Polyoxyethylene stearyl ether (20E.O.), average number of ethylene oxide moles added: 20, HLB value (measured): 15 Polyoxyethylene behenyl ether (10E.O.), average number of moles of ethylene oxide added: 10, HLB value (measured): 12

[0142] (Component (D)) Polyoxyethylene stearyl ether (5E.O.), average number of moles of ethylene oxide added: 5, HLB value (measured): 9 Polyoxyethylene cetyl ether (5E.O.), average number of moles of ethylene oxide added: 5, HLB value (measured by actual method): 9

[0143] (Component (E)) Paraffin wax (Nippon Seiro "PARAFFIN WAX-125") stearyl alcohol

[0144] (Component (F)) Liquid paraffin (mineral oil)

[0145] (Other ingredients) Calcium hydroxide Potassium hydroxide Polyoxyethylene lauryl ether (12E.O.), average number of moles of ethylene oxide added: 12, HLB value (measured): 15 Polyoxyethylene cetyl ether (150E.O.), average number of ethylene oxide moles added: 150 Sorbitan stearate, HLB value (measured by actual method) 8 Polyoxyethylene isostearyl ether (5E.O.), average number of moles of ethylene oxide added: 5, HLB value (measured): 8 Polyoxyethylene cetyl ether phosphate (20E.O.), average number of ethylene oxide moles added: 20 stearic acid Sodium gluconate glycerin purified water

[0146] (Examples 1 to 14 and Comparative Examples 1 to 10) Hair removal compositions were prepared by blending the ingredients (unit: mass %) shown in the following Tables 1 to 5. The blend amounts in the tables are shown as pure amounts.

[0147] The depilatory compositions obtained in Examples 1 to 14 and Comparative Examples 1 to 10 were cream-like depilatory compositions that did not have fluidity.

[0148] (evaluation) The resulting depilatory compositions were evaluated as follows: Test Examples 2 to 4 were evaluated by a panel of three experts, who discussed and decided the evaluation results.

[0149] Test Example 1: pH of hair removal composition The pH of the depilatory composition was measured using a pH meter ("F-74" manufactured by Horiba, Ltd.).

[0150] (Test Example 2: Skin irritation) 1 mL of the resulting depilatory composition was applied to the neck of three expert panelists and left for 10 minutes. The depilatory composition was then washed off. Itching and pain during use and after washing were evaluated according to the following criteria. Redness of the skin after washing was also evaluated according to the following criteria.

[0151] <Evaluation criteria for itching and pain during use and after washing> ○: No itching or pain at all △: Slight itching and / or pain ×: Severe itching and / or pain

[0152] <Evaluation criteria for redness of skin after cleansing> ○: No redness on the skin △: Skin is slightly red ×: Skin is clearly red

[0153] (Test Example 3: Hair removal power) 3 mL of the resulting hair removal composition was applied to the outer forearms of three expert panelists where body hair was present, and left for 10 minutes. The hair removal composition was then rinsed off. The degree of hair removal after rinsing was evaluated according to the following criteria.

[0154] <Evaluation criteria for hair removal power> ○: All body hair has been removed △: Most of the hair has been removed, although a small amount of hair remains. ×: Most of the hair remains unremoved

[0155] (Test Example 4: Emulsion Stability) The obtained depilatory composition was stored for 7 days at 25° C. The condition of the depilatory composition after storage was visually confirmed.

[0156] <Evaluation criteria for emulsion stability> ○: There is absolutely no change in the properties of the hair removal composition before and after storage ×: The hair removal composition after storage is separated into an aqueous layer and an oily layer.

[0157] The compositions and results are shown in Tables 1 to 5 below.

[0158] [Table 1]

[0159] [Table 2]

[0160] [Table 3]

[0161] [Table 4]

[0162] [Table 5]

[0163] Formulation examples of the depilatory composition of the present invention are shown below.

[0164] (Prescription Example 1) Thioglycolic acid 3.0% by mass Calcium hydroxide 5.0% by mass Potassium hydroxide 2.5% by mass Polyoxyethylene cetyl ether (20E.O.) 3.0% by mass Polyoxyethylene stearyl ether (10E.O.) 3.0% by mass Polyoxyethylene stearyl ether (5E.O.) 0.5% by mass Paraffin wax 3.0% by mass Cetyl alcohol 5.0% by mass Liquid paraffin 8.0% by mass Glycerin 5.0% by mass Sodium gluconate 0.5% by mass Aloe extract 0.1% by mass Soybean extract 0.1% by mass Medicinal charcoal 0.05% by mass Remaining purified water Total 100.0% by mass

[0165] (Prescription example 2) Calcium thioglycolate trihydrate 7.0% by mass Potassium hydroxide 3.0% by mass Polyoxyethylene cetyl ether (40E.O.) 2.5% by mass Polyoxyethylene stearyl ether (20E.O.) 4.5% by mass Polyoxyethylene cetyl ether (5E.O.) 0.4% by mass Microcrystalline wax 2.0% by mass Stearyl alcohol 7.0% by mass Squalane 10.0% by mass 1,3-butylene glycol 4.0% by mass Sodium gluconate 0.3% by mass Dipotassium glycyrrhizinate 0.1% by mass Hydrolyzed silk liquid 0.5% by mass Hydrolyzed collagen 0.1% by mass Coconut oil 0.1% by mass Remaining purified water Total 100.0% by mass

[0166] (Prescription Example 3) Ammonium thioglycolate 4.0% by mass Calcium hydroxide 6.0% by mass Potassium hydroxide 2.0% by mass Polyoxyethylene cetyl ether (10E.O.) 4.5% by mass Polyoxyethylene behenyl ether (10E.O.) 3.0% by mass Polyoxyethylene stearyl ether (2E.O.) 0.3% by mass Candelilla wax 2.0% by mass Stearyl alcohol 10.0% by mass 2-Ethylhexyl palmitate 10.0% by mass Diglycerin 1.0% by mass Sodium gluconate 0.3% by mass Hyaluronic acid 0.1% by mass Sodium ascorbate 0.1% by mass Hamamelis extract 0.1% by mass Remaining purified water Total 100.0% by mass

[0167] (Prescription Example 4) Monoethanolamine thioglycolate 7.0% by mass Calcium hydroxide 3.0% by mass Potassium hydroxide 3.0% by mass Polyoxyethylene cetyl ether (20E.O.) 2.5% by mass Polyoxyethylene isostearyl ether (16E.O.) 2.0% by mass Polyoxyethylene behenyl ether (5E.O.) 0.5% by mass Polyethylene wax 5.0% by mass Behenyl alcohol 5.0% by mass Castor oil 5.0% by mass Propylene glycol 5.0% by mass Sodium gluconate 0.5% by mass Licorice extract 0.1% by mass Chlorella extract 0.1% by mass Pueraria lobata extract 0.1% by mass Remaining purified water Total 100.0% by mass

Claims

1. The composition includes the following components A, B, C, and D: the content of the component A in terms of a thioglycolic acid structure is 2.0% by mass or more and 5.0% by mass or less, the molar concentration of calcium ions is 0.2 mol / kg or more and 0.9 mol / kg or less; A hair removal composition having an alkali metal ion molar concentration of 0.2 mol / kg or more and 0.6 mol / kg or less. Component A: thioglycolic acid and / or its salt Component B: Polyoxyethylene cetyl ether having an HLB value of 10 or more and an average number of moles of ethylene oxide added of less than 100 Component C: Polyoxyethylene alkyl ether having an HLB value of 10 or more and an alkyl group having 18 or more carbon atoms Component D: Polyoxyethylene alkyl ether having an HLB value of 7 or more and less than 10 and a linear alkyl group

2. The content of the component B is 1.0% by mass or more and 7.5% by mass or less, The content of the component C is 1.0% by mass or more and 7.5% by mass or less, The content of the component D is 0.1% by mass or more and 0.9% by mass or less, The total content of the component B and the component C is 2.0% by mass or more and 8.5% by mass or less, 2. The hair removal composition according to claim 1, wherein a mass ratio of the content of component B to the total content of component B and component C is 0.2 or more and 0.7 or less.

3. Contains the following component E and the following component F, The content of the component E is 5.0% by mass or more and 15.0% by mass or less, The hair removal composition according to claim 1 or 2, wherein the content of component F is 3.0% by mass or more and 12.5% ​​by mass or less. Component E: solid oil at 25°C Component F: Oil that is liquid at 25°C

4. The hair removal composition according to claim 1 or 2, which has a pH of 11.0 or more and 13.0 or less.

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