Depilatory composition

Abstract

The present invention relates to storage-stable depilatory compositions comprising a synthetic oil and a cellulose-based component and methods of using the same. The composition provides effective hair removal over an acceptable contact time while the skin is well tolerant to it.

Description

Technical Field

[0001] This invention relates to a storage-stable hair removal composition and its method of use. The composition provides effective hair removal within an acceptable contact time, while exhibiting good skin tolerance. Background Technology

[0002] Compositions for removing unwanted hair from mammals are well known. Such compositions include depilatory compositions containing compounds that degrade the keratin in the hair shaft, thereby weakening it and allowing removal. The depilatory composition is applied to an area containing unwanted hair, left there to degrade the hair, and then removed from the area along with the degraded hair.

[0003] This type of hair removal composition typically contains a hair removal compound with a thiol group, such as potassium thioglycolate, and usually contains potassium hydroxide to provide a high pH that contributes to hair removal efficacy. Hair removal compositions typically have a pH of 10 to 12.9.

[0004] Hair removal compositions are typically stored in temperatures ranging from slightly above freezing (e.g., in refrigerators or cold storage) to up to 50°C in warmer climates globally. The temperature range during storage can negatively impact a hair removal composition, leading to phenomena such as agglomeration, creaming, syneresis, coagulation, and / or phase separation. Such compositions become unsuitable for use. The presence of alkaline salts and high pH also makes hair removal compositions particularly prone to phase separation at higher temperatures.

[0005] There remains a need for storage-stable (also referred to herein as storage-stable) hair removal compositions. In particular, there remains a need for hair removal compositions that are stable during storage when exposed to high temperatures up to 50°C (e.g., temperatures in the range above freezing to up to 50°C), and that exhibit, for example, good pH stability, do not undergo phase separation during storage, and / or maintain an acceptable viscosity. It is also necessary to provide hair removal compositions that do not unacceptably thicken during production, as this could lead to difficulties in production and processing. Furthermore, it is necessary to provide hair removal compositions that do not unacceptably thicken during storage at the aforementioned temperatures, as this could lead to difficulties in applying the composition to the skin and / or in decanting the composition from its packaging.

[0006] The object of the present invention is to provide a hair removal composition comprising a hair removal agent that addresses one or more of the aforementioned disadvantages.

[0007] Another object of the present invention is to provide a storage-stable hair removal composition. A particular object is to provide a hair removal composition that exhibits good pH stability, does not undergo phase separation, maintains acceptable viscosity, and / or does not unacceptably thicken during production or storage (e.g., at the temperatures described above).

[0008] Another object of the present invention is to provide a hair removal composition that is stable for more than one week when stored at temperatures ranging from above freezing to up to 50°C.

[0009] Another object of the present invention is to provide a storage-stable hair removal composition that exhibits good hair removal properties within a contact time of less than 10 minutes.

[0010] Surprisingly, it has been found that one or more of the aforementioned drawbacks can be mitigated by including C8-C in hair removal compositions containing depilatory agents. 20 Alkyl hydroxyalkyl cellulose, especially cetyl hydroxyethyl cellulose, is used to resolve this issue, and the composition has a pH of 10 to 12.9 at 30°C.

[0011] EP2355788 A2 discloses a hair removal composition comprising a hair removal agent, a moisturizing agent selected from at least one of mineral oil and silicone oil, an alkaline source, and water. It does not specify the inclusion of C8-C. 20 Examples of hair removal compositions using alkyl hydroxyalkyl cellulose.

[0012] EP3348250 A1 discloses a depilatory cream composition comprising a depilatory agent, an emollient selected from at least one of mineral oil, silicone oil, and emollient esters, and silicone wax, talc, and / or polyamide resin. No composition containing C8-C is specified. 20 Examples of hair removal compositions using alkyl hydroxyalkyl cellulose. Summary of the Invention

[0013] In a first aspect, the present invention provides a hair removal composition comprising: (a) Synthetic oil, (b) Alkaline source, (c) Depilatory agents, (d) Water, and (e)C8-C 20 Alkyl hydroxyalkyl cellulose, The composition, when measured as a 10% w / v aqueous solution at 30°C ± 0.5°C or as a pure composition, has a pH in the range of 10 to 12.9, and the composition is urea-free.

[0014] In a second aspect, the present invention provides a hair removal composition comprising: (a) Synthetic oil, (b) Alkaline source, (c) Depilatory agents, (d) Water, and (e)C8-C 20 Alkyl hydroxyalkyl cellulose, The composition, when measured as a 10% w / v aqueous solution or as a pure composition at 30°C ± 0.5°C, has a pH in the range of 10 to 12.9, and the composition has a C8-C... 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is 1:15 to 1:35.

[0015] In a third aspect, the present invention provides a hair removal composition comprising: (a) Synthetic oil, (b) Alkaline source, (c) Depilatory agents, (d) Water, and (e)C8-C 20 Alkyl hydroxyalkyl cellulose, The composition, when measured as a 10% w / v aqueous solution or as a pure composition at 30°C ± 0.5°C, has a pH in the range of 10 to 12.9, and the C8-C... 20 The amount of alkyl hydroxyalkyl cellulose present is from 0.01% to 0.10% by weight.

[0016] It has been found that the hair removal composition of the present invention remains stable for at least one week, particularly at least two weeks, such as five or six weeks, when stored at high temperatures up to 50°C.

[0017] Furthermore, the hair removal compositions according to the invention provide excellent hair removal performance while exhibiting good skin tolerance. The compositions of the invention provide good hair removal within an acceptable contact time with the skin / hair, which further reduces the risk of skin irritation / damage. Typically, the compositions of the invention require a contact time of less than 10 minutes to provide effective hair removal, and according to some embodiments of the invention, contact times of less than 8 minutes, or even less than 7 minutes, can be provided.

[0018] In a fourth aspect, the present invention provides C8-C 20 Use of alkyl hydroxyalkyl cellulose in providing storage-stable hair removal compositions that are stable for at least one week at temperatures above freezing up to 50°C.

[0019] It has been found that the hair removal compositions of the present invention are stable for at least one week when stored at temperatures above freezing up to 50°C, for example 5°C to 50°C, preferably 5°C to 40°C, for example 5°C, 10°C, 15°C, 20°C, 25°C, 30°C, 35°C, 40°C, 45°C or 50°C, and typically for up to two, five or six weeks.

[0020] The fifth aspect of the invention provides the use of any hair removal composition according to the invention for removing hair by applying the hair removal composition to a body part from which hair is to be removed and allowing the hair removal composition to contact the hair for a sufficient time to adequately degrade the hair.

[0021] According to a sixth aspect of the present invention, a method for removing hair from human skin is provided, the method comprising the following steps: (i) Applying the composition of the present invention to human skin in the presence of excess hair; (ii) keeping the composition in contact with the excess hair for a predetermined time; and (iii) The composition and degraded excess hair are then removed from the skin.

[0022] The planned contact time is in the range of 1 to 10 minutes.

[0023] According to a seventh aspect of the present invention, a method for manufacturing a hair removal composition is provided, the method comprising: C8-C 20 Alkyl hydroxyalkyl cellulose is combined with a composition containing synthetic oil. Detailed Implementation

[0024] definition

[0025] As used herein, the term "depilatory" refers to a compound that acts on the keratin in hair to chemically degrade it by breaking down the disulfide bonds in the keratin. This chemical degradation weakens the hair, causing it to degrade and thus removing the weakened hair. This term does not include rosin materials or waxes, or any other one or more components that do not chemically degrade the hair but rather provide a hair removal effect by adhering to the hair.

[0026] As used herein, the term "body surface" refers to the external surface of a mammal, including but not limited to the head, face, and body. Mucous membranes are not included in this definition of "body surface".

[0027] As used herein, the term "storage stable" means that the composition exhibits less than 10% by volume of phase separation or no phase separation after a specified period of storage. The composition also preferably retains substantially its pH, viscosity, and / or color after a specified period of storage.

[0028] The pH of the compositions mentioned in this article is the pH of the compositions at 30°C ± 0.5°C. The pH was measured as a pure composition or as a 10% w / v aqueous solution.

[0029] Unless otherwise stated, all quantities herein are given as weight percent based on the total weight of the composition.

[0030] Synthetic oil

[0031] The hair removal composition of the present invention comprises a synthetic oil. The synthetic oil can be any synthetic oil suitable for the hair removal composition of the present invention. Suitable synthetic oils include mineral oils (e.g., heavy mineral oils and light mineral oils), silicone oils (e.g., polydimethylsiloxane, polymethylphenylsiloxane, and cyclic polysiloxanes), white oils, PPG stearates (e.g., PPG-15 stearate and PPG-11 stearate), and synthetic squalene. Combinations of these oils can also be used. Mineral oil is the most preferred synthetic oil.

[0032] The hair removal composition of the present invention may contain 0.1 to 10% by weight of synthetic oil, preferably 0.25 to 7% by weight, more preferably 0.5 to 5.0% by weight, most preferably 1.0 to 4% by weight, particularly 1.5 to 3.5% by weight, for example 1.75 to 3% by weight. Preferably, the composition of the present invention contains synthetic oil in an amount of, for example, 1.25, 1.50, 1.75, 1.80, 1.85, 1.90, 1.95, 2.00, 2.25, 2.50, 2.75, 3.00, 3.25, 3.35, 3.75, 4.00, 4.25, 4.50, 4.75, or 5.00% by weight.

[0033] alkaline source

[0034] The hair removal composition of the present invention comprises an alkaline source. This source may include hydroxides, such as hydroxides of alkali metals and alkaline earth metals. Suitable hydroxides include sodium hydroxide, potassium hydroxide, calcium hydroxide, and magnesium hydroxide, or combinations thereof. Preferably, the alkaline source is potassium hydroxide. Alternatively, potassium hydroxide may be used in conjunction with calcium hydroxide. The alkaline source may be present in a total amount of 0.01 to 5% by weight, preferably 0.1 to 4% by weight, for example, 0.2% to 2% or 3% by weight. When calcium hydroxide and potassium hydroxide are used together, calcium hydroxide may be present in an amount of 0.1% to 5% by weight, preferably 1% to 4% by weight, for example, 1.5% to 3% by weight, and potassium hydroxide may be present in an amount of 0.05% to 1.5% by weight, more preferably 0.1% to 1% by weight, and most preferably 0.2% to 0.5% by weight.

[0035] The amount of alkali metal hydroxide added will depend on the desired pH of the hair removal composition and other formulation considerations. However, it has been found that the compositions of the present invention containing the above-mentioned amounts of alkali metal hydroxide can simultaneously achieve good hair removal properties and acceptable contact time, and the compositions are well tolerated by the skin.

[0036] hair removal products

[0037] The depilatory agent present in the depilatory composition of the present invention can be any compound that removes hair through a chemical reaction (e.g., by degrading keratin present in the hair). Preferably, the depilatory active agent contains a thiol group, and most particularly preferably, the depilatory active agent containing a thiol group is selected from potassium thioacetate, calcium thioacetate, thioacetic acid, dithioerythritol, thioglycerol, mercaptoethanol, thioxanthine, thiosalicylic acid, N-acetyl-L-cysteine, lipoic acid, sodium dihydrolipoic acid 6,8-dithiooctanoate, sodium 6,8-dithiooctanoate, hydrogen sulfide, 2-mercaptopropionic acid, 3-mercapto-1,2-dithiooctanoate, etc. The depilatory agent comprises one or more of the following: propionic acid, thiomalic acid, ammonium thioacetate, glyceryl monothioacetate, monoethanolamine thioacetate, diammonium monoethanolamine dithiodiacetate, ammonium thiolactic acid, monoethanolamine thiolactic acid ester, mercaptoacetamide, homocysteine, cysteine, glutathione, dithiothreitol, dihydrolipoic acid, 1,3-dithiopropanol, mercaptoacetamide, mercaptoethanol-hydrazine, keratinase, guanidine thioacetate, and cysteine. Preferred depilatory agents include potassium thioacetate.

[0038] According to one embodiment of the invention, the depilatory agent comprises at least one of potassium thioglycolate, calcium thioglycolate, and thioglycolic acid, particularly at least one of potassium thioglycolate and thioglycolic acid. Typically, the composition comprises a thioglycolate salt, such as potassium thioglycolate and / or calcium thioglycolate. Although the composition is typically prepared using a thioglycolate salt, at least a portion of the thioglycolate salt is converted to thioglycolic acid during storage. Based on the total weight of the depilatory composition, the depilatory agent is preferably present in an amount of 0.5% to 10% by weight, more preferably 1.0% to 9% by weight, for example 1.5% to 7% by weight. Preferably, the composition of the invention comprises the aforementioned amounts of potassium thioglycolate and / or sodium thioglycolate and / or thioglycolic acid (total if more than one of these substances is present). Particularly preferred is that the composition comprises the aforementioned amounts of potassium thioglycolate and / or thioglycolic acid.

[0039] water

[0040] The compositions of the present invention comprise water. Water is appropriately added to bring the total composition to a balance of 100% by weight. The composition may contain 30 to 95% by weight of water, preferably 40 to 90% by weight, more preferably 45 to 85% by weight, most preferably 45 to 80% by weight, for example 50 to 75% by weight, for example 55 to 70% by weight. Typically, 40%, 45%, 50%, 55%, 60%, 65%, or 70% by weight of water are present in the hair removal compositions of the present invention.

[0041] C8-C 20 Alkyl hydroxyalkyl cellulose

[0042] The hair removal composition of the present invention contains C8-C20 Alkyl hydroxyalkyl cellulose or mixtures thereof. Suitably, C8-C 20 Alkyl hydroxyalkyl cellulose is selected from C 10 -C 18 Alkyl hydroxyalkyl cellulose, such as C 12 -C 18 Alkyl hydroxyalkyl cellulose, preferably C 12 -C 16 Alkyl hydroxyalkyl cellulose, preferably C 14 -C 16 Alkyl hydroxyalkyl cellulose, especially C 16 (Cetyl)hydroxyalkyl cellulose. The hydroxyalkyl group is preferably selected from hydroxyethyl and hydroxypropyl. Any of these groups can be combined with the aforementioned C8-C... 20 Any combination of alkyl chains in the alkyl chain. Suitably, C8-C 20 Alkyl hydroxyalkyl cellulose is selected from C8-C 20 Alkyl hydroxyethyl cellulose or C8-C 20 Alkyl hydroxypropyl cellulose, preferably C 10 -C 18 Alkyl hydroxyethyl cellulose or C 10 -C 18 Alkyl hydroxypropyl cellulose, more preferably C 12 -C 18 Alkyl hydroxyethyl cellulose or C 12 -C 18 Alkyl hydroxypropyl cellulose, the suitable one is C 12 -C 16 Alkyl hydroxyethyl cellulose or C 12 -C 16 Alkyl hydroxyethyl cellulose, C is the most preferred. 14 -C 16 Alkyl hydroxyethyl cellulose or C 14 -C 16 Alkyl hydroxypropyl cellulose, especially C 16 (Cetyl)hydroxyalkyl cellulose. Suitable, C8-C 20 Alkyl hydroxyalkyl cellulose is cetyl hydroxyethyl cellulose, stearyl hydroxyethyl cellulose, cetearyl hydroxyethyl cellulose, lauryl hydroxyethyl cellulose, myristyl hydroxyethyl cellulose, cetyl hydroxypropyl cellulose, stearyl hydroxypropyl cellulose, cetearyl hydroxypropyl cellulose, lauryl hydroxypropyl cellulose, myristyl hydroxypropyl cellulose, hydroxypropyl ethyl cellulose, or a combination thereof. Cetyl hydroxyethyl cellulose is particularly preferred according to the present invention.

[0043] Suitable, the hair removal composition of the present invention may contain 0.001 to 5% by weight of C8-C 20Alkyl hydroxyalkyl cellulose, preferably 0.01 to 2% by weight, more preferably 0.01 to 1.5% by weight, for example 0.02 to 1% by weight, and most preferably 0.02 to 0.5% by weight.

[0044] In some implementations, C8-C 20 Hydroxyalkyl cellulose is present in an amount of 0.01 to 0.10% by weight. In some embodiments, C8-C 20 Hydroxyalkyl cellulose is present in an amount of 0.05% by weight. In some embodiments, C8-C 20 Hydroxyalkyl cellulose is present in an amount of 0.10% by weight.

[0045] Preferably, the hair removal composition of the present invention may contain 0.02 wt%, 0.05 wt%, 0.1 wt%, 0.20 wt%, 0.30 wt%, 0.40 wt%, 0.45 wt%, or 0.50 wt% of C8-C. 20 Alkyl hydroxyalkyl cellulose. Specifically, the compositions of the present invention may include amounts of cetyl hydroxymethyl cellulose, cetyl hydroxyethyl cellulose, cetyl hydroxypropyl cellulose, cetyl hydroxybutyl cellulose, or cetyl hydroxypentyl cellulose, or combinations thereof. Most preferably, the hair removal compositions of the present invention contain the aforementioned amounts of cetyl hydroxyethyl cellulose.

[0046] In some embodiments, the hair removal composition of the present invention may have a C8-C ratio between 1:15 and 1:35. 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil. Specifically, C8-C 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is 1:15, 1:17, or 1:35.

[0047] pH

[0048] The hair removal composition of the present invention has a pH of 10 to 12.9. Preferably, the pH of the hair removal composition is 11.0-12.7, more preferably 11.2-12.6, and most preferably 11.5-12.5, for example, 11.5-12.5, including 11.1, 11.2, 11.3, 11.4, 11.5, 11.6, 11.7, 11.8, 11.9, 12.0, 12.1, 12.2, 12.3, 12.4, 12.5, 12.6, and 12.7. The pH values ​​of the composition are those measured at 30°C ± 0.5°C. The pH can be measured as a pure sample or as a 10% w / v aqueous solution. When the pH is measured as a pure composition, the pH is generally slightly higher than that of a 10% w / v solution of the same composition, and the pH typically varies by 0.1 to 0.3 pH units compared to the pH of a 10% w / v solution. When measured as a pure composition and as a 10% w / v aqueous solution at 30°C ± 0.5°C, the pH of the composition of the present invention should ideally be within the above range.

[0049] Forms of the composition

[0050] The hair removal compositions of the present invention can be in any suitable form. Preferred forms of the compositions include gels, mousses, foams, creams, lotions, or oil-water emulsions. The form can be selected according to the intended application area of ​​the composition. Particularly preferred forms of the compositions include oil-water emulsions, creams, mousses, and foams. Particularly preferred compositions include oil-water emulsions and creams.

[0051] Optional ingredients

[0052] The hair removal composition of the present invention may contain additional optional ingredients. Such optional ingredients may vary depending on the physical form of the composition and other formulation considerations.

[0053] The hair removal composition of the present invention may contain one or more surfactants. The surfactant may be anionic, cationic, or nonionic. It is preferably nonionic. Examples of suitable surfactants include cetearyl phosphate, cetearyl glucoside, ceteareth 20, steareth 2, or steareth 21. When present, the surfactant is preferably present in an amount of 0.5 to 10% by weight, more preferably 0.6 to 2.0% by weight, relative to the weight of the hair removal composition.

[0054] The hair removal composition of the present invention may further contain fatty alcohols, such as cetearyl alcohol, cetyl alcohol, behenyl alcohol, and stearyl alcohol, which act as co-emulsifiers. These co-emulsifiers may be present in an amount of 0.5 to 10% by weight, more preferably 2% to 6% by weight. These components do not form part of the synthetic oil used in the composition of the present invention.

[0055] The hair removal composition of the present invention may further comprise a humectant. Suitable humectants include polyols, such as glycerin, propylene glycol, and butylene glycol. Glycerin is preferred. The humectant may be present in an amount of 0.001 to 10% by weight, preferably 0.5 to 5% by weight, and most preferably 1.0 to 4.0% by weight.

[0056] Optionally, the hair removal composition of the present invention may contain an accelerator that accelerates the keratin degradation reaction. Suitable accelerators include urea, thiourea, dimethyl isosorbide, ethoxydiglycol, and methyl propyl diol. Preferably, the accelerator is urea or methyl propyl diol. The hair removal composition according to the present invention preferably contains 0.5 to 15% by weight of the accelerator, more preferably 1 to 12% by weight, even more preferably 1.5 to 10% by weight, for example 2 to 8% by weight, for example 1.0% by weight, 2.0% by weight, 3.0% by weight, 4.0% by weight, 5.0% by weight, 6.0% by weight, 7.0% by weight, 8.0% by weight, 10.0% by weight, 11.0% by weight, or 12.0% by weight.

[0057] The hair removal composition of the present invention may contain other optional ingredients, such as pigments and fillers, such as clay. Examples of suitable clays include kaolin, bentonite, sodium magnesium silicate, magnesium trisilicate, and titanium dioxide. Preferably, the hair removal composition of the present invention contains clay of the above types, particularly kaolin. When present, clay, particularly kaolin, is preferably present in amounts of 0.01 to 10% by weight, more preferably 0.1 to 5% by weight, most preferably 0.15 to 2% by weight, for example 0.2 to 1% by weight, for example 0.01%, 0.02%, 0.05%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, or 5.0% by weight. Pigments may be included in any suitable amount. Typically, pigments (if present) may be included in amounts of 0.001% to 1% by weight, preferably 0.002% to 0.5% by weight, for example 0.002% to 0.1% by weight.

[0058] The hair removal composition of the present invention may contain a chelating agent, such as sodium gluconate, EDTA, or tetrasodium EDTA. The chelating agent may be present in an amount of less than 1% by weight, preferably from 0.01 to 0.5% by weight, for example from 0.05 to 0.1% by weight.

[0059] The hair removal composition may also include additives that inhibit phase separation. Suitable additives include polymers or copolymers of acrylic acid, such as acrylate copolymers. Such additives may be present in an amount of up to 2% by weight, preferably less than 1% by weight, more preferably less than 0.5% by weight, for example, 0.1 to 0.4% by weight.

[0060] Optionally, the compositions of the present invention may contain skin care additives such as aloe vera and vitamin E. Typical amounts of such additives are less than 1% by weight of the composition, for example, 0.1% to 0.5% by weight.

[0061] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of synthetic oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, (e) 0.01 to 5% by weight of C8-C 20 Alkyl hydroxyethyl cellulose, and wherein the composition is free of urea.

[0062] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of mineral oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, (e) 0.01 to 5% by weight of C8-C 20 Alkyl hydroxyethyl cellulose, and wherein the composition is free of urea.

[0063] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of synthetic oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, (e) 0.01 to 5% by weight of C 10 -C 18 Alkyl hydroxyethyl cellulose, and wherein the composition is free of urea.

[0064] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of mineral oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, (e) 0.01 to 5% by weight of C 10 -C 18 Alkyl hydroxyethyl cellulose, and wherein the composition is free of urea.

[0065] In some embodiments, the hair removal composition comprises: (a) 0.5 to 7% by weight of mineral oil, (b) 0.1 to 1% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 60% by weight water, (e) 0.05 to 3% by weight of cetyl hydroxyethyl cellulose, wherein the composition is free of urea.

[0066] In some embodiments, the hair removal composition comprises: (a) 1.5 to 3.5% by weight of mineral oil, (b) 0.05 to 1.0% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, (e) 0.025 to 0.5% by weight of cetyl hydroxyethyl cellulose, wherein the composition is free of urea.

[0067] In some embodiments, the hair removal composition comprises: (a) 1.7 to 1.9% by weight of mineral oil, (b) 0.2 to 1.0% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, (e) 0.05 to 0.3% by weight of cetyl hydroxyethyl cellulose, wherein the composition is free of urea.

[0068] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of synthetic oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, (e) 0.01 to 5% by weight of C8-C 20 Alkyl hydroxyethyl cellulose, and wherein the C8-C of the composition is... 20The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is 1:15 to 1:35.

[0069] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of mineral oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, (e) 0.01 to 5% by weight of C8-C 20 Alkyl hydroxyethyl cellulose, and wherein the C8-C of the composition is... 20 The ratio of alkyl hydroxyalkyl cellulose to mineral oil is 1:15 to 1:35.

[0070] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of synthetic oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, (e) 0.01 to 5% by weight of C 10 -C 18 Alkyl hydroxyethyl cellulose, and wherein the C of said composition 10 -C 18 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is 1:15 to 1:35.

[0071] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of mineral oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) at least 40% by weight water, (e) 0.01 to 5% by weight of C 10 -C 18 Alkyl hydroxyethyl cellulose, wherein the C of the composition 10 -C 18 The ratio of alkyl hydroxyalkyl cellulose to mineral oil is 1:15 to 1:35.

[0072] In some embodiments, the hair removal composition comprises: (a) 0.5 to 7% by weight of mineral oil, (b) 0.1 to 1% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 60% by weight water, (e) 0.05 to 3% by weight of cetyl hydroxyethyl cellulose, wherein the ratio of cetyl hydroxyethyl cellulose to mineral oil in the composition is 1:15 to 1:35.

[0073] In some embodiments, the hair removal composition comprises: (a) 1.5 to 3.5% by weight of mineral oil, (b) 0.05 to 1.0% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, (e) 0.025 to 0.5% by weight of cetyl hydroxyethyl cellulose, wherein the ratio of cetyl hydroxyethyl cellulose to mineral oil in the composition is 1:15 to 1:35.

[0074] In some embodiments, the hair removal composition comprises: (a) 1.7 to 1.9% by weight of mineral oil, (b) 0.2 to 1.0% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, (e) 0.05 to 0.3% by weight of cetyl hydroxyethyl cellulose, wherein the ratio of cetyl hydroxyethyl cellulose to mineral oil in the composition is 1:15 to 1:35.

[0075] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of synthetic oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) at least 40% by weight of water, and (e) 0.01 to 0.10 wt% C8-C 20 Alkyl hydroxyethyl cellulose.

[0076] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of mineral oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 40% by weight water, and (e) 0.01 to 0.10 wt% C8-C 20 Alkyl hydroxyethyl cellulose.

[0077] In some embodiments, the hair removal composition comprises: (b) 0.01 to 10% by weight of synthetic oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) at least 40% by weight of water, and (e) 0.01 to 0.10 wt% C 10 -C 18 Alkyl hydroxyethyl cellulose.

[0078] In some embodiments, the hair removal composition comprises: (a) 0.01 to 10% by weight of mineral oil, (b) 0.1 to 10% by weight of potassium hydroxide, (c) 0.5 to 10% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) at least 40% by weight of water, and (e) 0.01 to 0.10 wt% C 10 -C 18 Alkyl hydroxyethyl cellulose.

[0079] In some embodiments, the hair removal composition comprises: (a) 0.5 to 7% by weight of mineral oil, (b) 0.1 to 1% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 60% by weight water, and (e) 0.01 to 0.10% by weight of cetyl hydroxyethyl cellulose.

[0080] In some embodiments, the hair removal composition comprises: (a) 1.5 to 3.5% by weight of mineral oil, (b) 0.05 to 1.0% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, and (e) 0.01 to 0.10% by weight of cetyl hydroxyethyl cellulose.

[0081] In some embodiments, the hair removal composition comprises: (a) 1.7 to 1.9% by weight of mineral oil, (b) 0.2 to 1.0% by weight of potassium hydroxide, (c) 0.5 to 7% by weight of potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, and (e) 0.01 to 0.10% by weight of cetyl hydroxyethyl cellulose.

[0082] The present invention also provides a method for removing hair from the body surface of a mammal, such as the head, body, or face, the method being performed by: i) Applying the composition according to the invention to the body surface of a mammal where hair removal is desired. ii) Allow the composition to contact the body surface for 1 to 10 minutes. iii) Then remove the composition and degraded hair from the body surface.

[0083] The hair removal compositions of the present invention can be applied and removed by any suitable method, depending on the type of composition. Such methods are well known in the art. For example, creams or lotions can be applied to the area to be treated manually or by means of a device (e.g., a scraper, roller, tube applicator, or similar device). Mousse or foam compositions can be applied directly from a dispensing device such as an aerosol can or pump dispenser.

[0084] After the desired contact time between the unwanted hair and the hair removal composition of the present invention has elapsed and the unwanted hair has degraded, the hair removal composition and the degraded hair can be removed by any suitable means, for example, in the same manner as the application of the composition. Typically, a razor or similar device, especially a razor or similar device with a substantially straight edge, or a flexible object such as foam / paper towel / cloth / wiping object, can be used to remove the hair removal composition and the degraded hair. This is simply achieved by “scraping” the hair removal composition by moving the razor or flexible object around the area where it has been applied. In this way, the hair removal composition is lifted from the area where it has been applied and can be removed. Any residual composition can be removed, for example, by rinsing with water. Alternatively, the composition can be rinsed away with water.

[0085] The hair removal compositions of the present invention generally allow contact with a body surface, such as skin or hair, for at least 1 minute, preferably at least 3 minutes, for example, 4 minutes. However, to reduce any potential skin irritation caused by using the compositions of the present invention, the contact time is preferably less than 10 minutes, preferably less than 8 minutes, for example, less than 7 minutes. The preferred contact time between the compositions of the present invention and the hair to be removed is 2 to 8 minutes, more preferably 3 to 7 minutes, for example, 4 to 7 minutes (inclusive). It has been found that when using these contact times, the compositions of the present invention provide effective hair removal but are well tolerated by the skin.

[0086] Ideally, the hair removal composition of the present invention removes the highest possible percentage of unwanted hair in a single treatment. Since the application method and the achieved results can vary very slightly from user to user (as this is affected by the type of hair treated, the application method, the contact time, and individual expectations), a hair removal result of more than about 50% is generally considered acceptable to the user. A hair removal result higher than this is preferred, for example, at least 55%, more preferably at least 65%, even more preferably at least 70%, or even more preferably at least 75%, and ideally higher than 80%, 85%, or 90%.

[0087] The invention will now be described in more detail with reference to the following non-limiting embodiments. Other examples within the scope of the invention will be apparent to those skilled in the art.

[0088] Example

[0089] The following examples illustrate the comparative compositions and preferred embodiments of the present invention. It should be understood that these examples are provided by way of illustration only, and that those skilled in the art can readily generate other useful compositions falling within the scope and spirit of the invention without departing from the scope and spirit of the invention.

[0090] method

[0091] The compositions in Table 1 were prepared using the following methods: 1. Combine mineral oil, stearyl alcohol polyether 2, stearyl alcohol polyether 21, modified paraffin (if used), and cetearyl alcohol, and heat to at least 75°C to ensure they are completely dissolved.

[0092] 2. Separately, thoroughly mix calcium hydroxide, kaolin, and sodium gluconate together in the main volume (approximately 45% to 50% of the formulation volume) of water to ensure complete dispersion of the components, and then heat to 70°C to 75°C.

[0093] 3. When both are at the stated temperature and mixed until homogeneity of the composition is achieved, the composition from step 1 is emulsified into the mixture from step 2.

[0094] 4. Begin cooling the mixture from step 3. When the temperature reaches approximately 60°C, add the glycerin and mix until homogeneous.

[0095] 5. When the mixture in step 4 reaches approximately 50°C, add 20% by weight of the premixed gel phase C8-C in water to the batch. 20 Add hydroxyalkyl cellulose (or HPMC) and mix again until homogeneous.

[0096] 6. When the temperature of the mixture reaches below 45°C, add any fragrances, dyes, and emotive ingredients (such as aloe barbadensis, vera) one by one and mix until homogeneous.

[0097] 7. Once the temperature of the composition reaches below 38°C, add potassium mercaptoacetate, followed by potassium hydroxide.

[0098] 8. Finally, homogenize the composition to ensure uniformity, and then cool it to below 30°C with stirring.

[0099] Table 1. Compositions Natrosol cetyl hydroxyethyl cellulose TM Plus 330 CS, purchased from Ashland TM .

[0100] Hydroxypropyl methylcellulose, Methocel TM K15M, purchased from International Flavors & Fragrances, Inc (IFF).

[0101] Hydroxypropyl methylcellulose, Methocel TM K4M, purchased from IFF.

[0102] For compositions 1 to 6, the concentration of the active substance is 0.4% by weight; for compositions 7 and 9, it is 0.1% by weight; and for composition 8, it is 0.2% by weight.

[0103] For compositions 1 to 5 and 7, the concentration of the active substance is 5.7% by weight, and for compositions 7 and 9, it is 4.44% by weight.

[0104] Temperature stability test

[0105] Viscosity, pH, appearance, and thioglycolic acid levels were measured initially and after certain storage periods to assess the temperature stability of the composition.

[0106] Samples of compositions 1 through 9 were sealed in HDPE plastic and aluminum barrier tubes and placed in temperature-controlled chambers and ovens at 5°C, 40°C, and 50°C for up to 6 weeks. The samples were evaluated at different time points within the 6 weeks. A final evaluation of all compositions was performed at 6 weeks and 50°C.

[0107] Viscosity test

[0108] Viscosity measurements were performed at a temperature range of 20±3℃ using a Brookfield DVii+ viscometer, a T-shaped spindle D at 5 rpm, and a 150 ml stabilizing pan with a diameter of 5 cm. A helipath support was connected to the viscometer, and five measurements were taken at 30, 35, 40, 45, and 50 seconds each.

[0109] The spiral support is designed for measuring non-flowing substances. It consists of a T-shaped moving part and a drive motor that oscillates at a constant speed, mounted on the viscometer's frame and generating a spiral motion to allow the measurement of very viscous products, such as creams, without creating pores. The drive motor slowly lowers or raises the viscometer, causing the T-shaped rod spindle to create a spiral path through the test sample, thus eliminating channeling problems.

[0110] Calculate the average of the five viscosity measurements above and express it as the product viscosity. Viscosity measurements were performed on the composition stored at 5°C, 40°C, and 50°C during the first week of storage and at 5°C and 50°C during the sixth week of storage.

[0111] pH test

[0112] The pH of the composition was measured using a combined electrode with a standard KCl electrolyte and a fixed-binding diaphragm, and a combined temperature sensor with a potassium glass sensor. pH measurements were performed at 30 °C ± 0.5 °C. Measurements were taken from the pure sample or a 10% w / v aqueous solution of the sample, according to the results.

[0113] Transfer the formulation to a pure sample or a container as a 10% aqueous solution, place it in a water bath, and allow it to equilibrate to 30°C ± 0.5°C for at least 30 minutes. Insert the pH electrode into the sample until the pH stabilizes. Perform frequent probe cleaning, calibration, and buffer checks to ensure consistent and reliable results.

[0114] Thioglycolic acid test

[0115] The content of thioglycolic acid (TGA) was measured by iodine titration using a platinum electrode. The composition was diluted and completely dissolved in 40g of water by adding 1.4g to the water.

[0116] Appearance - Phase Separation

[0117] Sensory tests were performed by removing the compositions from temperature-controlled rooms and ovens and allowing them to acclimate at room temperature for 24 hours. To evaluate the compositions, they were gently extruded from their original packaging onto white trays, and the emulsion stability, appearance of water droplets, odor, and color were assessed visually and by odor.

[0118] The appearance of the compositions stored at 5°C, 40°C, and 50°C during the first week of storage, and at 5°C and 50°C during the sixth week of storage, was evaluated. For appearance evaluation, water separation assessment scores were recorded using the following appearance scoring system (note the presence of water droplets): 1. No water droplets (passed) 2. 1-3 water droplets (passing through) 3. 4-5 water droplets (passing through) 4. 6+ water droplets (not acceptable) The results of the water separation assessment (appearance) are given in Table 2.

[0119] Compositions 1, 2 and 3 are the comparative compositions listed in Tables 2 through 5.

[0120] result

[0121] Table 2. Appearance

[0122] (-Untested)( (3 samples rated 1, 1 sample rated 3)

[0123] The results in Table 2 show that comparative compositions 1, 2, and 3, containing HPMC, all separated after 6 weeks of storage at 50°C. Compositions 4-9 (according to the present invention), containing cetyl hydroxyethyl cellulose, did not separate after 6 weeks of storage at 50°C. These results indicate that the compositions of the present invention exhibit good storage stability at 50°C, while the comparative compositions completely split and are not storage stable. Compositions 4 and 6 are the only compositions of the present invention whose storage stability was tested at 5°C. Both compositions showed good storage stability at 5°C.

[0124] The viscosity of the comparative examples and the compositions of the present invention was measured using the method described above. The viscosity of the samples listed in Table 3, stored at a specified temperature for a specified time, was measured.

[0125] Table 3. Viscosity

[0126] (-Untested)

[0127] The results in Table 3 show that, after 6 weeks of storage at 50°C, compositions 4, 5, 6, 7, 8, and 9 (containing cetyl hydroxyethyl cellulose) of the present invention exhibited little or no viscosity change (only small viscosity changes within acceptable tolerances). This demonstrates the excellent high-temperature storage stability of the compositions of the present invention. The comparison compositions all separated during the 6-week storage period, therefore viscosity measurements could not be performed on them.

[0128] The pH of the comparative examples and the compositions of the present invention was measured using the method described above. The results are given in Table 4.

[0129] Table 4. pH

[0130] ( Measured in 10% w / v aqueous solution,† Measured in pure composition, -not tested)

[0131] The results in Table 4 show that the pH of the compositions of the present invention is unaffected when stored at 50°C for 6 weeks. The comparison compositions completely separated during 6 weeks of storage, therefore their pH could not be measured.

[0132] The thioglycolic acid (TGA) content of the comparative examples and the compositions of the present invention was measured using the method described above. The results are shown in Table 5.

[0133] Table 5. Thioglycolic acid

[0134] (-Untested)

[0135] The results showed that, for the compositions of the present invention, the level of thioglycolic acid (TGA) did not decrease significantly after storage at 50°C for 6 weeks. The comparison compositions completely separated during the 6-week storage period, making it impossible to measure the TGA level in these compositions.

[0136] With no synthetic oils and C8-C 20 Compared to comparative examples of alkyl hydroxyalkyl cellulose, the compositions of the present invention exhibit superior storage stability (including stability in appearance / water droplet presence, viscosity, pH, and TGA content).

[0137] Hair removal efficacy test

[0138] The hair removal compositions in Table 6 are compositions according to the present invention and prepared using the manufacturing method described above. Frescolat is added in step 6 of the above method. TM MGA Plus. Their hair removal efficacy was tested using the following methods (results are expressed as averages).

[0139] Table 6. Compositions Natrosol TM Plus 330 CS, purchased from Ashland TM .

[0140] A coolant mixture of menthone glycerol acetal and menthol, purchased from Symrise.

[0141] method

[0142] Hair removal was performed on the participants' calves. A total of 41 participants were tested.

[0143] Mark six test sites (3 per leg) measuring 10cm x 5cm. Trim hairs longer than 5mm to an equal length of approximately 3mm. Take a macroscopic photograph of each test site before applying the depilatory cream.

[0144] Trained personnel applied each depilatory cream composition to the test site using random rotation. One site remained untreated. Depending on the amount of depilatory active ingredient in the composition, the depilatory cream composition was left in contact with the skin for 4.5 minutes, 5.5 minutes, or 6.5 minutes. Application time was based on the minimum application time of the depilatory cream. Add 1.5 minutes to indicate the average time spent applying the cream to both lower legs.

[0145] After the relevant contact time was reached, the depilatory cream composition was removed with a razor. A second macroscopic photograph was taken of each test site after removal. The number of hairs before application and after removal of the depilatory cream composition was counted, and the percentage of hair removed was determined. The success criterion for a composition to pass the hair removal test was at least 70% hair removal: this was considered an acceptable level of hair removal for consumers. The results of the hair removal test are given in Table 7.

[0146] Table 7 - Hair Removal Test Results

[0147] The results show that, at the lower confidence level of 5%, compositions 10 through 14 exhibited high average hair reduction, with an average reduction of over 80% hair removal within 3 minutes. The combined mean of all hair removal test results was an average reduction of 89.4% in terms of hair presence. All tested compositions produced excellent hair removal within a 3-minute contact time with skin and hair.

Claims

1. A hair removal composition comprising: (a) Synthetic oil, (b) Alkaline source, (c) Depilatory agents, (d) Water, and (e) C8-C 20 Alkyl hydroxyalkyl cellulose, The composition, when measured as a 10% w / v aqueous solution at 30°C ± 0.5°C or as a pure composition, has a pH in the range of 10 to 12.9, and the composition is urea-free.

2. The hair removal composition according to claim 1, wherein, The C8-C 20 The amount of hydroxyalkyl cellulose present is from 0.001% by weight to 5% by weight.

3. The hair removal composition according to claim 2, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is from 0.01% to 0.10% by weight.

4. The hair removal composition according to claim 2 or 3, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is 0.05 by weight.

5. The hair removal composition according to claim 2 or 3, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is 0.10 by weight.

6. The hair removal composition according to any one of the preceding claims, wherein, The C8-C of the composition 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is 1:15 to 1:

35.

7. The hair removal composition according to claim 6, wherein, C8-C 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is selected from a group consisting of 1:15, 1:17, or 1:

35.

8. A hair removal composition comprising: (a) Synthetic oil, (b) Alkaline source, (c) Depilatory agents, (d) Water, and (e) C8-C 20 Alkyl hydroxyalkyl cellulose, The composition, when measured as a 10% w / v aqueous solution or as a pure composition at 30°C ± 0.5°C, has a pH in the range of 10 to 12.9, and the composition has a C8-C... 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is 1:15 to 1:

35.

9. The hair removal composition according to claim 8, wherein, C8-C 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is selected from a group consisting of 1:15, 1:17, or 1:

35.

10. The hair removal composition according to claim 8 or 9, wherein, The C8-C 20 The amount of hydroxyalkyl cellulose present is from 0.001% by weight to 5% by weight.

11. The hair removal composition according to claim 10, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is from 0.01% to 0.10% by weight.

12. The hair removal composition according to claim 11, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is 0.05 by weight.

13. The hair removal composition according to claim 11, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is 0.10 by weight.

14. A hair removal composition comprising: (a) Synthetic oil, (b) Alkaline source, (c) Depilatory agents, (d) Water, and (e) C8-C 20 Alkyl hydroxyalkyl cellulose, The composition, when measured as a 10% w / v aqueous solution or as a pure composition at 30°C ± 0.5°C, has a pH in the range of 10 to 12.9, and the C8-C... 20 The amount of alkyl hydroxyalkyl cellulose present is from 0.01% to 0.10% by weight.

15. The hair removal composition according to claim 14, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is 0.05 by weight.

16. The hair removal composition according to claim 14, wherein, The C8-C 20 The amount of alkyl hydroxyalkyl cellulose present is 0.10 by weight.

17. The hair removal composition according to any one of claims 14 to 16, wherein, The C8-C of the composition 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is 1:15 to 1:

35.

18. The hair removal composition according to claim 17, wherein, C8-C 20 The ratio of alkyl hydroxyalkyl cellulose to synthetic oil is selected from a group consisting of 1:15, 1:17, or 1:

35.

19. The hair removal composition according to any one of the preceding claims, wherein, The synthetic oil is selected from mineral oil, silicone, white oil, PPG stearate, synthetic squalane, or a combination thereof.

20. The hair removal composition according to claim 19, wherein, The synthetic oil is a mineral oil.

21. The hair removal composition according to any one of the preceding claims, wherein, The composition contains 0.01% to 10% by weight of synthetic oil.

22. The hair removal composition according to any one of the preceding claims, wherein, The C8-C 20 Alkyl hydroxyalkyl cellulose is selected from C 10 -C 18 Alkyl hydroxyalkyl cellulose.

23. The hair removal composition according to claim 22, wherein, The C 10 -C 18 Alkyl hydroxyalkyl cellulose is C 16 Alkyl hydroxyalkyl cellulose.

24. The hair removal composition according to claim 23, wherein, The C 16 Alkyl hydroxyalkyl cellulose is cetyl hydroxyethyl cellulose.

25. The hair removal composition according to any one of the preceding claims, wherein, The alkaline source contains potassium hydroxide.

26. The hair removal composition according to any one of the preceding claims, wherein, The total amount of the alkaline source is from 0.01% to 5% by weight.

27. The hair removal composition according to any one of the preceding claims, wherein, The hair removal agent is potassium thioglycolate.

28. The hair removal composition according to any one of the preceding claims, wherein, The composition contains 0.5% to 10% by weight of a depilatory agent.

29. The hair removal composition according to any one of the preceding claims, wherein, The composition contains 30 to 95% by weight of water.

30. The hair removal composition according to any one of the preceding claims, wherein, The pH of the composition is in the range of 11.0 to 12.

7.

31. The hair removal composition according to any one of the preceding claims, wherein the composition is stable for at least one week when stored at 50°C.

32. A hair removal composition comprising: (a) 1.7% to 1.9% by weight of mineral oil, (b) 0.2% to 1.0% by weight of potassium hydroxide, (c) 0.5% to 7% by weight potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, (e) 0.05% to 0.3% by weight of cetyl hydroxyethyl cellulose, and The composition has a pH in the range of 11.0 to 12.7 when measured as a 10% w / v aqueous solution or as a pure composition at 30°C, and the composition is urea-free.

33. A hair removal composition comprising: (a) 1.7% to 1.9% by weight of mineral oil, (b) 0.2% to 1.0% by weight of potassium hydroxide, (c) 0.5% to 7% by weight potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, (e) 0.05% to 0.3% by weight of cetyl hydroxyethyl cellulose, and The composition has a pH range of 11.0 to 12.7 when measured as a 10% w / v aqueous solution or as a pure composition at 30°C, and the ratio of cetyl hydroxyethyl cellulose to mineral oil in the composition is 1:15 to 1:

35.

34. A hair removal composition comprising: (a) 1.7% to 1.9% by weight of mineral oil, (b) 0.2% to 1.0% by weight of potassium hydroxide, (c) 0.5% to 7% by weight potassium mercaptoacetate and / or mercaptoacetic acid, (d) At least 65% by weight water, and (e) 0.01% to 0.10% by weight of cetyl hydroxyethyl cellulose, The pH of the composition, measured at 30°C as a 10% w / v aqueous solution or as a pure composition, is in the range of 11.0 to 12.

7. 35.C8-C 20 Use of the combination of alkyl hydroxyalkyl cellulose and synthetic oil in the composition of any one of the preceding claims, wherein, The intended use provides a hair removal composition that is stable for at least one week at temperatures above freezing up to 50°C.

36. Use of the hair removal composition according to any one of claims 1 to 34, for removing hair by applying the hair removal composition to a body part where hair is to be removed and contacting the hair with the hair for a sufficient time to adequately degrade the hair, thereby allowing its removal.

37. A method for removing hair from human skin, the method comprising the following steps: (i) Applying the composition of any one of claims 1 to 34 to human skin in the presence of excess hair; (ii) Keep the composition in contact with the excess hair for a predetermined time; as well as (iii) The composition and degraded excess hair are then removed from the skin.

38. The method according to claim 37, wherein, The contact time on the skin is 1 to 10 minutes.

39. A method for manufacturing the hair removal composition according to any one of the preceding claims, wherein, The method includes C8-C 20 The step of combining alkyl hydroxyalkyl cellulose with a composition containing synthetic oil.

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