Cosmetic agent containing adenosine
Patent Information
- Application Number
- EP2024790892
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-10-31
- Filing Date
- 2024-10-15
- Publication Date
- 2026-09-09
AI Technical Summary
Existing sprayable hair tonics containing high concentrations of adenosine for hair growth and loss prevention are unstable and cause scalp dryness due to high ethanol content, which also leads to faster color fading in hair.
A stable, sprayable aqueous oil-in-water emulsion formulation with adenosine, comprising a water-insoluble oil component, non-ionic emulsifiers, co-emulsifiers, and water, with a water content of 60-90% and adenosine concentration of 0.01-3% by weight, which maintains scalp moisture and prevents color fading.
The formulation achieves high stability and effective delivery of adenosine, preventing hair loss and promoting growth while maintaining scalp hydration and preserving hair color.
Smart Images
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Abstract
Description
[0001] Cosmetic product containing adenosine
[0002] The invention is an invention in the field of hair tonics. It relates to sprayable aqueous compositions with skin and hair care effects containing adenosine.
[0003] The present invention relates to a hair tonic with hair-care effects, such as preventing hair loss and promoting hair growth. Adenosine is an active ingredient used in various cosmetic preparations, such as hair tonics, to prevent hair loss and promote hair growth. Such preparations are preferably sprayed onto the scalp and hair for easy application and should be able to be applied without weighing down the hair.
[0004] It is desirable to be able to use high concentrations of adenosine in these products in order to achieve a satisfactory effect for the user. High concentrations of between 0.1 and 1.5 wt.% adenosine can currently only be delivered in sprayable products with an ethanol content of at least 20 wt.%. Adenosine cannot be incorporated stably into sprayable products with a significantly lower ethanol content. However, products with such a high alcohol content lead to severe drying of the consumer's scalp and to faster fading of colored hair. It is therefore desirable to provide a product that overcomes the aforementioned disadvantages.
[0005] It was therefore the aim of the present invention to provide stable sprayable aqueous compositions in which adenosine is present in a high concentration and which do not dry out the scalp.
[0006] Surprisingly, it was found that this task can be solved with an oil-in-water emulsion containing adenosine.
[0007] A first subject matter of the present application is therefore a sprayable hair tonic in the form of an oil-in-water emulsion containing at least one water-insoluble oil component (A), at least one non-ionic emulsifier (B), at least one co-emulsifier (C) and water, wherein the water content is 60 - 90 wt.%, component (A) is present in an amount of 1.5 to 25 wt.%, components (B) and (C) are present in a total amount of 1 to 12 wt.%, characterized in that adenosine is present in an amount of 0.01 to 3 wt.%.
[0008] The agent according to the invention contains a water-insoluble oil component (A) in an amount of 1.5 to 25 wt.%, preferably in an amount of 5.0 to 20, particularly preferably 10 to 15 wt.%. The water-insoluble oil component (A) is preferably selected from the group of fatty acid esters with a fatty acid alkyl chain length of C8 to C36, natural or synthetic triglycerides, hydrocarbons liquid at 20°C and 1013 mbar, and mixtures thereof.
[0009] The fatty acid esters with a fatty acid alkyl chain length of C8 to C36 are preferably those esterified with saturated alcohols with an alkyl chain length of C3 to C26. These are preferably, for example, caprylic acid (CaOOH) esters / capric acid (CioOOH) esters of saturated C12-18 fatty alcohols and / or isopropyl myristic ester. These fatty acid esters are preferably used in amounts of 5.0 to 25 wt.%, particularly preferably 7 to 20 wt.%, and especially preferably 8 to 15 wt.%, based on the agent according to the invention.
[0010] The natural triglycerides can be vegetable triglycerides such as olive oil, almond oil, peanut oil, sunflower oil, soybean oil, rapeseed oil, palm oil, but also the liquid portions of coconut oil or palm kernel oil or mixtures thereof. The natural triglycerides can also be triglycerides of animal origin such as neatsfoot oil and / or the liquid portions of beef tallow. If natural triglycerides are used, it is preferred according to the invention that they are vegetable triglycerides. The synthetic triglycerides can be those obtained by esterifying glycerol with fatty acids having 8-22 C atoms, e.g. triglycerides of caprylic acid-capric acid mixtures, triglycerides from technical oleic acid or from palmitic acid-oleic acid mixtures or mixtures thereof.The natural or synthetic triglycerides, fatty acid esters, or mixtures thereof are preferably those that are liquid at 20°C and 1013 mbar. However, higher-melting triglycerides and esters corresponding to the formulas given can also be used in amounts such that the mixture of oil components remains liquid at 20°C and 1013 mbar. These triglycerides are preferably used in amounts of 1.5 to 25 wt.%, particularly preferably 5.0 to 15 wt.%, based on the composition according to the invention.
[0011] The hydrocarbons that are liquid at 20°C and 1013 mbar can be C11 to C16 hydrocarbons, for example linear C11 to C16 hydrocarbons or branched C11 to C16 hydrocarbons. They are preferably, for example, mixtures of n-undecane and n-tridecane or isododecane and / or isohexadecane. These hydrocarbons are preferably used in amounts of 5.0 to 25 wt.%, particularly preferably 7 to 20 wt.%, and especially preferably 8 to 15 wt.%, based on the composition according to the invention.
[0012] A preferred article is therefore an agent as listed above, wherein the water-soluble oil component (A) is selected from the group of fatty acid esters having a fatty acid alkyl chain length of C8 to C36, natural or synthetic triglycerides, hydrocarbons which are liquid at 20 °C and 1013 mbar, and mixtures thereof.
[0013] A further preferred subject matter is an agent as listed above, wherein the water-soluble oil component (A) comprises a mixture of caprylic acid (Ö8ÖOH) esters / capric acid (CioOOH) esters of saturated C12-18 fatty alcohols and triglycerides of caprylic acid-capric acid mixtures, preferably in an amount of 2.0 to 10 wt.%.
[0014] The agent according to the invention contains at least one nonionic emulsifier (B) and at least one nonionic coemulsifier (C) in a total amount of 1 to 12 wt.%. The total amount of nonionic emulsifier (B) and nonionic coemulsifier (C) in the agent according to the invention is preferably 3.0 to 10 wt.%, particularly preferably 5.0 to 8.0 wt.%.
[0015] The at least one nonionic emulsifier (B) can preferably be one or more representatives from the group of alkoxylated C8-C22 fatty alcohols, preferably alkoxylated C16-C22 fatty alcohols. Particular preference is given to ethoxylated C8-C22 fatty alcohols with 8 to 26 EO, especially preferably ethoxylated C16-C18 fatty alcohols with 12 to 20 EO.
[0016] The at least one nonionic emulsifier (B) can preferably be one or more alkyl polyglucosides. In this case, they are preferably C8 to C18 polyglucosides, particularly preferably lauryl glucosides, decyl glucosides, and coco glucosides, or mixtures thereof.
[0017] It is further preferred that the at least one non-ionic emulsifier (B) has an HLB value of 10 to 18.
[0018] A preferred subject matter is accordingly an agent as listed above, wherein the at least one non-ionic emulsifier (B) comprises one or more representatives from the group of alkoxylated C16-C22 fatty alcohols.
[0019] A further preferred subject matter is accordingly an agent as listed above, wherein the at least one non-ionic emulsifier (B) comprises one or more alkyl polyglucosides.
[0020] A further preferred subject matter is accordingly an agent as listed above, wherein the at least one non-ionic emulsifier (B) has an HLB value of 10 to 18.
[0021] A further preferred subject matter is accordingly an agent as listed above, wherein the at least one non-ionic emulsifier (B) comprises a mixture of alkoxylated C8-C22 fatty alcohols and / or C8 to C16 polyglucosides.
[0022] Furthermore, articles comprising mixtures of different non-ionic emulsifiers (B) are also preferred.
[0023] A further preferred subject matter is an agent as listed above, wherein the nonionic emulsifier (B) comprises a mixture of polyethylene glycol ether (20EO) of cetylstearyl alcohol and polyethylene glycol ether (12EO) of cetylstearyl alcohol.
[0024] The at least one non-ionic co-emulsifier (C) may preferably be one or more representatives from the group of C8-C22 monofatty acid esters of glycerol, C10-C18 monofatty acid esters of sorbitan, C12-C22 fatty alcohols, and mixtures thereof.
[0025] The at least one non-ionic co-emulsifier (C) may preferably be a C8-C22 monofatty acid ester of glycerol or mixtures thereof, particularly preferably glyceryl monostearate, glyceryl monolaurate, glyceryl caprylates or mixtures thereof.
[0026] The at least one nonionic co-emulsifier (C) can preferably be a C10-C18 monofatty acid ester of sorbitan or mixtures thereof, particularly preferably sorbitan monolaurates, sorbitan monooleates, sorbitan monostearates, or mixtures thereof. The at least one nonionic co-emulsifier (C) can preferably be a C12-C22 fatty alcohol, particularly preferably cetylstearyl alcohol, myristyl alcohol, behenyl alcohol, or mixtures thereof.
[0027] A preferred subject matter is accordingly an agent as listed above, wherein the at least one non-ionic co-emulsifier (C) comprises one or more representatives from the group of C8-C22 monofatty acid esters of glycerol, C10-C18 monofatty acid esters of sorbitan, C12-C22 fatty alcohols, and mixtures thereof.
[0028] A further preferred subject matter is accordingly an agent as listed above, wherein the at least one nonionic co-emulsifier (C) comprises a C12-C22 monofatty acid ester of glycerol or mixtures thereof, particularly preferably glycerol monostearate. A further preferred subject matter is accordingly an agent as listed above, wherein the at least one nonionic co-emulsifier (C) comprises a C10-C18 monofatty acid ester of sorbitan or mixtures thereof, particularly preferably sorbitan monolaurates, sorbitan monooleates, sorbitan monostearates, or mixtures thereof.
[0029] A further preferred subject matter is accordingly an agent as listed above, wherein the at least one non-ionic co-emulsifier (C) comprises a C12-C22 fatty alcohol or mixtures thereof, particularly preferably cetylstearyl alcohol.
[0030] Furthermore, articles comprising mixtures of different non-ionic co-emulsifiers (C) are also preferred.
[0031] A further preferred subject matter is accordingly an agent as listed above, wherein the non-ionic co-emulsifier (C) comprises a mixture of monofatty acid esters of glycerol, mainly of stearic (C18) and palmitic acid (C16) (INCI: glycerol monostearate) and cetylstearyl alcohol.
[0032] A further preferred subject matter is accordingly an agent as listed above, in which the non-ionic emulsifier (B) comprises a mixture of polyethylene glycol ether (20EO) of cetylstearyl alcohol and polyethylene glycol ether (12EO) of cetylstearyl alcohol, the non-ionic co-emulsifier (C) comprises a mixture of monofatty acid esters of glycerol, mainly of stearic (C18) and palmitic acid (C16) (INCI: glycerol monostearate) and cetylstearyl alcohol, and the total amount of components (B) and (C) is preferably 3.0 to 10% by weight, particularly preferably 5.0 to 8.0% by weight.A further preferred subject matter is accordingly an agent as previously listed, in which the non-ionic emulsifier (B) comprises a mixture of polyethylene glycol ether (20EO) of cetylstearyl alcohol and polyethylene glycol ether (12EO) of cetylstearyl alcohol, the non-ionic co-emulsifier (C) comprises a mixture of monofatty acid esters of glycerol, mainly of stearic (C18) and palmitic acid (C16) (INCI: glycerol monostearate) and cetylstearyl alcohol, and the water-soluble oil component (A) comprises a mixture of caprylic acid (CaOOH) esters / capric acid (CioOOH) esters of saturated C12-18 fatty alcohols and triglycerides of caprylic acid-capric acid mixtures or caprylic acid (CsOOH) esters / capric acid (CioOOH) esters of saturated C12-18 fatty alcohols or a mixture of n-undecane and n-tridecane or isopropyl myristic acid.
[0033] The claimed hair tonic contains adenosine in an amount of 0.01 to 3.0 wt.%. Adenosine is a nucleotide and consists of the nucleic base adenine and the sugar ß-D-ribose. Preferred agents contain adenosine in an amount of 0.05 to 3.0 wt.%, particularly preferably 0.1 to 2 wt.%, in particular 0.1 to 1.0 wt.%. Furthermore, agents containing adenosine in amounts of 0.2 to 1.5 wt.%, in particular 0.5 to 1.0 wt.%, may be preferred.
[0034] It is therefore a preferred object if the hair tonic contains adenosine in an amount of 0.1 to 2.0 wt.%, in particular 0.1 to 1.0 wt.%.
[0035] The claimed hair tonic contains adenosine as an active ingredient. The hair tonic can also contain adenosine derivatives, such as adenosine 5'-phosphates. It is preferred that the claimed agent contains only a limited amount of adenosine derivatives, such as adenosine 5'-phosphates, e.g., adenosine monophosphate (INCI: Adenosine Phosphate), adenosine diphosphate, and / or adenosine triphosphate (INCI: Adenosine Triphosphate). It is preferred that the agent contains less than 0.5% by weight, particularly preferably less than 0.2% by weight, and in particular less than 0.1% by weight, of the adenosine phosphate group. In particular, it may be preferred that the agent be free of adenosine phosphates. Free from adenosine phosphates in this context means that adenosine phosphate is neither added as a separate ingredient nor introduced into the claimed product via preparations of other ingredients, for example in amounts of up to 0.001 wt.-% based on the total mass of the product.
[0036] A preferred article is therefore a hair tonic which contains less than 0.5% by weight, particularly preferably less than 0.2% by weight, in particular less than 0.1% by weight, of one or more ingredients from the group of adenosine 5'-phosphates.
[0037] A preferred article is therefore also a hair tonic which contains adenosine in an amount of 0.05 to 3.0 wt.%, particularly preferably 0.1 to 2 wt.%, in particular 0.1 to 1.0 wt.%.A further preferred subject matter is accordingly an agent as previously listed, in which the non-ionic emulsifier (B) comprises a mixture of polyethylene glycol ether (20EO) of cetylstearyl alcohol and polyethylene glycol ether (12EO) of cetylstearyl alcohol, the non-ionic co-emulsifier (C) comprises a mixture of monofatty acid esters of glycerol, mainly of stearic (C18) and palmitic acid (C16) (INCI: glycerol monostearate) and cetylstearyl alcohol, and the water-soluble oil component (A) comprises a mixture of caprylic acid (CaOOH) esters / capric acid (CioOOH) esters of saturated C12-18 fatty alcohols and triglycerides of caprylic acid-capric acid mixtures or caprylic acid (CsOOH) esters / capric acid (CioOOH) esters of saturated C12-18 fatty alcohols or a mixture of n-undecane and n-tridecane or myristic acid isopropyl ester and adenosine in an amount of 0.05 to 3.0 wt.%, particularly preferably 0.1 to 2 wt.%, in particular 0.5 to 1.0 wt.-% is included.
[0038] A further preferred subject matter is accordingly an agent as previously listed, in which the non-ionic emulsifier (B) comprises a mixture of polyethylene glycol ether (20EO) of cetylstearyl alcohol and polyethylene glycol ether (12EO) of cetylstearyl alcohol, the non-ionic co-emulsifier (C) comprises a mixture of monofatty acid esters of glycerol, mainly of stearic (C18) and palmitic acid (C16) (INCI: glycerol monostearate) and cetylstearyl alcohol, and the water-soluble oil component (A) comprises a mixture of caprylic acid (C8ÖOH) esters / capric acid (C10OOH) esters of saturated C12-18 fatty alcohols and triglycerides of caprylic acid-capric acid mixtures or caprylic acid (C8ÖOH) esters / capric acid (C10OOH) esters of saturated C12-18 fatty alcohols or a mixture of n-undecane and n-tridecane or myristic acid isopropyl ester and adenosine in an amount of 0.05 to 3.0 wt.%, particularly preferably 0.1 to 2 wt.%, in particular 0.5 to 1.0 wt.-% and which contains less than 0.5 wt.%, particularly preferably less than 0.2 wt.%, in particular less than 0.1 wt.%, of one or more ingredients from the group of adenosine 5'-phosphates.
[0039] The aqueous embodiments contain water in an amount of 65 to 90 wt. %. Embodiments which contain water in an amount of 70 to 85 wt. %, particularly preferably 70 to 80 wt. % are preferred. Water serves primarily to adjust the concentrations of the previously defined ingredients to a range which is suitable for the aqueous, sprayable hair tonic. It is preferred that the claimed compositions have a pH of 2.0 to 11.0, preferably of 3.0 to 7.0, particularly preferably of 4.0 to 6.0, especially preferably of 4.5 to 5.5 at 20°C. A preferred subject matter is therefore a composition as described above, wherein the composition has a pH of 2.0 to 11.0, preferably of 3.0 to 7.0, particularly preferably of 4.0 to 6.0, especially preferably of 4.5 to 5.5 at 20°C. All pH values given in this application apply to measurements at 20 °C.
[0040] In order to ensure improved skin compatibility compared to compositions with a high ethanol content, the claimed hair tonic preferably contains less than 18 wt.%, particularly preferably a maximum of 10 wt.%, especially preferably a maximum of 5 wt.% ethanol.
[0041] A preferred article is therefore a hair tonic as described above, which contains less than 18% by weight, particularly preferably a maximum of 10% by weight, especially preferably a maximum of 5% by weight of ethanol.
[0042] Furthermore, it is preferred if the claimed hair tonic contains a maximum of 5% by weight, particularly preferably less than 1% by weight, especially preferably less than 0.5% by weight, of ethanol or is free of ethanol.
[0043] In this context, "free from ethanol" means that ethanol is neither added as a separate ingredient nor introduced into the claimed product via preparations of other ingredients, for example, in amounts of up to 2% by weight based on the total mass of the product. Another preferred product is therefore a hair tonic as described above, which contains a maximum of 5% by weight, particularly preferably less than 1% by weight, especially preferably less than 0.5% by weight, and even more preferably less than 0.1% by weight, of ethanol, or which is free from ethanol.
[0044] To ensure the stability of the composition and a fine distribution of the ingredients, it is important that the oil component (A) is present as small droplets in the emulsion. According to the invention, the average droplet diameter of the oil components (A) is less than 1 pm (micrometer), preferably less than 600 nm (nanometer), more preferably less than 300 nm (nanometer) (measured using a quasi-elastic light scattering device (Zetasizer Nano ZS, 25 °C, square polystyrene cuvette, 12 mm edge length (model DTS0012), dilution: 0.025% w / w in water).
[0045] A preferred article is therefore a hair tonic as described above, in which the mean droplet diameter of the oil components (A) is less than 1 pm, preferably less than 600 nm, more preferably less than 300 nm, measured with an instrument based on the principle of quasi-elastic light scattering (Zetasizer Nano ZS, 25 °C, square polystyrene cuvette, 12 mm edge length (model DTS0012), dilution: 0.025% w / w in water).
[0046] The aqueous sprayable hair tonic as described above can be used by the
[0047] person can be easily applied to the relevant areas because it is sprayable and can therefore be distributed finely and evenly. In order to ensure good sprayability, the hair treatment composition according to the invention is preferably free of viscosity-increasing ingredients such as the polyquaternium polymers known under the INCI names Polyquarternium-10 and Polyquarternium 37, as long as this is compatible with economical operation, i.e. as long as small amounts of corresponding substances are not introduced as minor components or impurities of customary ingredients. Such and comparable viscosity-increasing ingredients are preferably contained in the hair treatment composition according to the invention in an amount of at most 2% by weight, further preferably at most 0.5% by weight and particularly preferably at most 0.1% by weight, based on the total weight of the hair treatment composition.
[0048] It is preferred according to the invention that the hair tonic as described above preferably has a viscosity of at most 150 mPa*s, particularly preferably from 0.8 to 50 mPa*s, in particular 1.0 to 20.0 mPa*s, measured with a Brookfield rotational viscometer (type DV1, spindle 1, 20 RPM), in order to ensure good sprayability.
[0049] A preferred article is thus a hair tonic as described above, which has a viscosity of at most 150 mPa*s, particularly preferably from 0.8 to 50 mPa*s, in particular 1.0 to 20.0 mPa*s, measured with a Brookfield rotational viscometer (type DV1, spindle 1, 20 RPM).
[0050] The compositions that can achieve the aforementioned object are prepared in a specific manner. Therefore, the present application further provides a process for producing sprayable aqueous preparations of adenosine, in which an aqueous solution of adenosine is mixed with a finely divided emulsion of an oil component (A), wherein the oil component (A) has an average droplet diameter of less than 1 μm (measured using an instrument based on the principle of quasi-elastic light scattering (Zetasizer Nano ZS, 25 °C, square polystyrene cuvette, 12 mm edge length (model DTS0012), dilution: 0.025% w / w in water)), in an amount such that the preparation contains 1.5 to 20 wt.% of the emulsified oil component (A), wherein the emulsion was brought to phase inversion temperature during or after its preparation and before mixing with the adenosine solution.
[0051] In preferred processes, the mean droplet diameter of the oil component (A) is preferably less than 600 nm, more preferably less than 300 nm.
[0052] Furthermore, processes are preferred in which the aqueous solution of adenosine has a temperature of at most 50 °C, preferably at most 45 °C, and / or the temperature of the finely divided emulsion of an oil component (A) is from 30 to 50 °C, preferably from 30 to 40 °C, measured directly before mixing the solution and the emulsion.
[0053] Particularly preferred are processes in which the finely divided emulsion of an oil component (A) is a PIT emulsion which further comprises at least one nonionic emulsifier (B) and at least one nonionic coemulsifier (C). Furthermore, preferred are processes according to the invention in which the pH of the preparation is adjusted to a value between 2 and 11, preferably between 3.0 and 7.0.
[0054] A preferred subject matter is therefore a claimed process as described above, in which the aqueous solution of adenosine has a temperature of at most 50 °C, preferably of at most 45 °C, and / or the temperature of the finely divided emulsion of an oil component (A) is from 30 to 50 °C, preferably from 30 to 40 °C, measured directly before mixing the solution and the emulsion.
[0055] A further preferred subject matter is therefore a claimed process as described above, in which the finely divided emulsion of an oil component (A) is a PIT emulsion which further comprises at least one non-ionic emulsifier (B) and at least one non-ionic co-emulsifier (C).
[0056] A further preferred subject matter is therefore a claimed method as described above, in which the pH of the preparation is adjusted to a value between 3.0 and 7.0.
[0057] A particularly preferred subject matter is therefore a claimed process as described above, in which the finely divided emulsion of an oil component (A) is a PIT emulsion which further comprises at least one non-ionic emulsifier (B) and at least one non-ionic co-emulsifier (C) and in which the pH of the preparation is adjusted to a value between 3.0 and 7.0, wherein optionally the aqueous solution of adenosine has a temperature of at most 50 °C, preferably of at most 45 °C, and / or the temperature of the finely divided emulsion of an oil component (A) is from 30 to 50 °C, preferably from 30 to 40 °C, measured directly before mixing the solution and the emulsion.
[0058] Stable aqueous compositions containing adenosine in high concentrations have been demonstrated above. A further subject of the present application is therefore the use of a sprayable aqueous emulsion for stabilizing adenosine with an ethanol content of less than 18 wt.%.
[0059] A further subject matter of the present application is the use of a sprayable aqueous preparation containing adenosine with an ethanol content of less than 18% by weight for the cosmetic treatment of the skin, in particular the scalp.
[0060] All information provided for the product described is also directly applicable to the described procedures and uses.
[0061] This applies in particular but not exclusively to the data and characteristics of components (A), (B), and (C), ethanol content, viscosity, measurement method, pH value and other specified ingredients.
[0062] The claimed objects are also further described, but not exhaustively, by the following points: Point 1: Sprayable hair tonic in the form of an oil-in-water emulsion containing at least one water-insoluble oil component (A), at least one non-ionic emulsifier (B), at least one co-emulsifier (C) and water, wherein the water content is 65 - 90 wt.%, component (A) is present in an amount of 1.5 to 25 wt.%, components (B) and (C) are present in a total amount of 1 to 12 wt.%, characterized in that adenosine is present in an amount of 0.01 to 3 wt.%.
[0063] Item 2: Agent according to item 1, wherein the agent contains less than 0.5% by weight, particularly preferably less than 0.2% by weight, in particular less than 0.1% by weight, of one or more ingredients from the group of adenosine 5'-phosphates.
[0064] Item 3: Agent according to one of the preceding items, wherein the mean droplet diameter of the oil components (A) is less than 1 pm, preferably less than 600 nm, more preferably less than 300 nm, measured with an instrument based on the principle of quasi-elastic light scattering (Zetasizer Nano ZS, 25 °C, square polystyrene cuvette, 12 mm edge length (model DTS0012), dilution: 0.025% w / w in water).
[0065] Item 4: Agent according to one of the preceding items, wherein the agent has a viscosity at 20 °C of at most 150 mPa*s, particularly preferably from 0.8 to 50 mPa*s, in particular 1 to 20 mPa*s, measured with a Brookfield rotational viscometer (type DV1, spindle 1, 20 RPM).
[0066] Item 5: Agent according to one of the preceding items, wherein the agent has a pH of 2.0 to 11.0, preferably of 3.0 to 7.0, particularly preferably of 4.0 to 6.0, especially preferably of 4.2 to 5.5 at 20°C.
[0067] Item 6: Agent according to one of the preceding items, wherein the at least one water-soluble oil component (A) is selected from the group of fatty acid esters having a fatty acid alkyl chain length of C8 to C36, natural or synthetic triglycerides, hydrocarbons which are liquid at 20 °C and 1013 mbar, and mixtures thereof.
[0068] Item 7: Agent according to one of the preceding items, wherein the at least one non-ionic emulsifier (B) is one or more representatives from the group of alkoxylated C8-C22 fatty alcohols, preferably alkoxylated C16-C22 fatty alcohols.
[0069] Item 8: Agent according to one of the preceding items, wherein the at least one nonionic emulsifier (B) is one or more members from the group of alkyl polyglucosides. Item 9: Agent according to one of the preceding items, wherein the at least one nonionic emulsifier (B) has an HLB value of 10 to 18.
[0070] Item 10: Agent according to one of the preceding items, wherein the at least one non-ionic co-emulsifier (C) is one or more representatives from the group of C8-C22 monofatty acid esters of glycerol, C10-C18 monofatty acid esters of sorbitan, C12-C22 fatty alcohols, and mixtures thereof.
[0071] Item 11: Agent according to one of the preceding items, wherein the agent contains less than 18% by weight, preferably at most 10% by weight, particularly preferably at most 5% by weight, more preferably less than 1% by weight of ethanol.
[0072] Item 12: Agent according to one of the preceding items, wherein the agent comprises 0.05 to 3.0 wt.%, particularly preferably 0.1 to 2 wt.%, in particular 0.1 to 1.0 wt.%, of adenosine.
[0073] Item 13: A process for the preparation of sprayable aqueous preparations of adenosine, in which an aqueous solution of adenosine is mixed with a finely divided emulsion of an oil component (A), the oil component (A) having an average droplet diameter of less than 1 pm (measured using an apparatus based on the principle of quasi-elastic light scattering (Zetasizer Nano ZS, 25 °C, square polystyrene cuvette, 12 mm edge length (model DTS0012), dilution: 0.025% w / w in water)), in an amount such that the preparation contains 1.5 to 20% by weight of the emulsified oil component (A), the emulsion having been brought to phase inversion temperature during or after its preparation and before mixing with the adenosine solution.
[0074] Item 14: Use of a sprayable aqueous preparation containing adenosine with an ethanol content of less than 18% by weight for the cosmetic treatment of the skin, in particular the scalp. Examples of use:
[0075] The following compositions (Examples 1-3 and E1-E3) were prepared in the same way:
[0076] For production, the (co-)emulsifiers were combined with the oil component and water (the ratio of (co-)emulsifiers and oil components to water is between 1:2 and 1:3) to form a PIT emulsion, with the emulsion being brought to phase inversion temperature during or after its production. An aqueous adenosine solution (1.5% to 2.5%) was then added. The temperature of the PIT emulsion was a maximum of 35°C and the temperature of the adenosine solution a maximum of 50°C. After cooling to room temperature (20°C), the perfume was added (optional). Optional ingredients such as perfume and preservatives were introduced via the adenosine solution.
[0077] Example formulations:
[0078] 1: INCI: Glyceryl Stearate (and) Ceteareth-20 (and) Ceteareth-12 (and) Cetearyl Alcohol (and)
[0079] Cetyl Palmitate
[0080] 2 : INCI: Ceteareth-12
[0081] 3 : INCI: Coco Caprylate / Caprate
[0082] 4 : INCI: Undecane (and) Tridecane
[0083] The following emulsions (E1-E3) and solutions (V1) were provided:
[0084] For V1, the appropriate amount of adenosine was dissolved in water.
[0085]
[0086] 1 : INCI: Glyceryl Stearate (and) Ceteareth-20 (and) Ceteareth-12 (and) Cetearyl Alcohol (and) Cetyl Palmitate
[0087] 2 : INCI: Ceteareth-12
[0088] 3 : INCI: Coco Caprylate / Caprate
[0089] 4 : INCI: Undecane (and) Tridecane
[0090] It was shown that the PIT emulsions can stabilize adenosine in the applied amount, resulting in stable sprayable compositions with a suitable viscosity (EIES). An aqueous composition containing adenosine without an oil phase and emulsifiers was unstable, forming a precipitate after 24 hours (V1).
[0091] For composition E1, particle sizes of the oil phase and the viscosity of the composition were determined:
[0092] Average particle size: 62 nm
[0093] Device: Zetasizer Nano ZS
[0094] Cuvette: square, 12 mm edge length, polystyrene cuvette (model number DTS0012), Dilution: 0.25 g of composition E1 was diluted in 9.75 g of water and measured
[0095] Viscosity: 7.5 - 10 mPa*s (in several repetitions and measurements)
[0096] Equipment: Brookfield rotational viscometer (Type DV1, Spindle 1, 20 RPM, 20 °C)
Claims
Patent claims:
1. Sprayable hair tonic in the form of an oil-in-water emulsion containing at least one water-insoluble oil component (A), at least one non-ionic emulsifier (B), at least one co-emulsifier (C) and water, wherein the water content is 65 - 90 wt.%, component (A) is present in an amount of 1.5 to 25 wt.%, components (B) and (C) are present in a total amount of 1 to 12 wt.%, characterized in that adenosine is present in an amount of 0.01 to 3 wt.%.
2. Agent according to one of the preceding claims, wherein the agent has a pH value of 2.0 to 11.0, preferably of 3.0 to 7.0, particularly preferably of 4.0 to 6.0, especially preferably of 4.5 to 5.5 at 20°C.
3. Agent according to one of the preceding claims, wherein the at least one water-soluble oil component (A) is selected from the group of fatty acid esters having a fatty acid alkyl chain length of C8 to C36, natural or synthetic triglycerides, hydrocarbons liquid at 20 °C and 1013 mbar, and mixtures thereof.
4. Agent according to one of the preceding claims, wherein the at least one non-ionic emulsifier (B) is one or more representatives from the group of alkoxylated C8-C22 fatty alcohols, preferably alkoxylated C16-C22 fatty alcohols.
5. Agent according to one of the preceding claims, wherein the at least one non-ionic emulsifier (B) is one or more representatives from the group of alkyl polyglucosides.
6. Agent according to one of the preceding claims, wherein the at least one non-ionic co-emulsifier (C) is one or more representatives from the group of C8-C22 monofatty acid esters of glycerol, C10-C18 monofatty acid esters of sorbitan, C12-C22 fatty alcohols, and mixtures thereof.
7. Agent according to one of the preceding claims, wherein the agent contains less than 18% by weight, preferably at most 10% by weight, particularly preferably at most 5% by weight, more preferably less than 1% by weight of ethanol.
8. Agent according to one of the preceding claims, wherein the agent comprises 0.05 to 3.0 wt.%, particularly preferably 0.1 to 2 wt.%, in particular 0.1 to 1.0 wt.%, of adenosine.
9. A process for the preparation of sprayable aqueous preparations of adenosine, in which an aqueous solution of adenosine is mixed with a finely divided emulsion of an oil component (A), wherein the oil component (A) has an average droplet diameter of less than 1 pm (measured with an apparatus based on the principle of quasi-elastic light scattering (Zetasizer Nano ZS, 25 °C, square polystyrene cuvette, 12 mm edge length (model DTS0012), dilution: 0.025% w / w in water)), in an amount such that the preparation contains 1.5 to 20 wt.% of the emulsified oil component (A), wherein the emulsion was brought to phase inversion temperature during or after its preparation and before mixing with the adenosine solution.
10. Use of a sprayable aqueous preparation containing adenosine with an ethanol content of less than 18% by weight for the cosmetic treatment of the skin, in particular the scalp.