Sprayable solution-based dry shampoo composition and uses thereof

Abstract

The present disclosure relates to a sprayable solution-based dry shampoo composition comprising 2-30 % (w / w) of an oil absorbent; 5-25 %(w / w) of ethanol; and water; wherein the oil absorbent is selected from the list consisting of: hydrophilic tapioca starch, hydrolysed corn starch, maltodextrin, or mixtures thereof. Furthermore, the present disclosure relates to a product comprising said dry shampoo composition.

Description

D E S C R I P T I O NSPRAYABLE SOLUTION-BASED DRY SHAMPOO COMPOSITION AND USES THEREOFTECHN ICAL FI ELD

[0001] The present disclosure relates to cosmetic hair care products, namely to a dry shampoo composition that offers high absorption of oils while providing improved volume increase and enhanced shelf-life stability. Furthermore, the present disclosure relates to a product comprising said dry shampoo composition.BACKGROUND

[0002] Dry shampoo compositions for cleansing of hair are well known. These known compositions can be used on dry hair in order to freshen up the hair and / or to remove excess sebum, sweat and other undesirable substances found on dirty hair. The use of a dry shampoo can save time, water and provide added convenience since no rinsing with water is needed; rather, removal of the dry shampoo can be simply by brushing or blotting it from the scalp.

[0003] Dry shampoo is a hair product that removes grease and oil from the hair without the need of water. It typically comes in powder or aerosol spray form and is applied directly to the roots of the hair. The main ingredients often absorb excess sebum and other oils from the scalp, leaving the hair looking cleaner and fresher. Dry shampoo is popular for extending the time between hair washes, adding volume, and refreshing hair after exercise or when washing is not convenient.

[0004] However, dry shampoos currently on the market can have various disadvantageous characteristics. Most of the products currently available on the market lead to a visible white remnant of material (white residue) in the hair after cleansing. Dry shampoo powders may also have unsatisfactory capacity to absorb oil and to provide hair volume effect, or has a tendency to form clumps of particles.

[0005] Traditional dry shampoos typically contain particulate materials suspended in a liquid carrier. Dispensing such suspension from the packaging normally requires using a liquified petroleum gas (LPG) propellant, which rises environmental / sustainability concerns, as well as supply chain, due to safety considerations / special requirements on the shipment of this kind of products, namely by air.

[0006] Additionally, the suspended particles make the dispensing more difficult, often lead to clogging issues, especially in spray systems, resulting in unreliable performance, quality issues and user dissatisfaction.

[0007] Therefore, the need for a dry shampoo formulation that overcomes these drawbacks while providing effective cleansing properties and packaging flexibility has long been recognized.

[0008] These facts are disclosed in order to illustrate the technical problem addressed by the present disclosure.G EN ERAL DESCRIPTION

[0009] The present disclosure relates to a dry shampoo composition, preferably a sprayable solutionbased dry shampoo composition, comprising 2-30 % (w / w) of an oil absorbent, 5-25 % (w / w) of ethanol, and water, wherein the oil absorbent is selected from the list consisting of: hydrophilic tapioca starch, hydrolysed corn starch, maltodextrin, or mixtures thereof. It was surprisingly found that the composition developed allow to obtain a solution-based dry shampoo with improved properties.

[0010] Unexpectedly, it was found that the specific combination of ethanol and the specific oil absorbents provides a synergistic effect, resulting in significantly improved functional properties. In particular, this optimized balance leads to enhanced oil absorption capacity, while also contributing to a noticeable increase in hair volume post-application.

[0011] Surprisingly, the dry shampoo of the present disclosure does not lead to the formation of a white residue in the hair. This is a common disadvantage of the dry shampoo compositions of the prior art and one of the main reasons that make consumers avoiding using dry shampoos.

[0012] It also showed improved oil absorption, volume increase and shelf-life stability.

[0013] The dry shampoo composition of the present disclosure allows to eliminate or at least drastically reduce the issues of clogging associated with particle suspensions found in conventional dry shampoos. The suspended particles in traditional dry shampoos often complicate the dispensing process. These particles frequently lead to clogging issues in spray systems, resulting in unreliable performance and increased user dissatisfaction. The formulation of the present disclosure overcomes these challenges by using an improved composition that ensures a smooth, consistent spray and reduces the likelihood of clogging, thereby enhancing user experience and reliability.

[0014] Moreover, it can be conveniently packaged in various formats, including but not limited to pump spray, aerosol can, bag on valve systems. This flexibility enables consumers to choose their preferred dispensing method according to their convenience and usage preferences.

[0015] The sprayable dry shampoo composition of the present disclosure also provides:- high absorption of excess oils, impurities, and odours from your scalp and hair;- increase in volume: it provides a volume effect to the hair;- shelf-life stability: resistance to microbiologic contamination and moisture and maintain stability of its physical characteristics.

[0016] The sprayable solution-based dry-shampoo composition of the present disclosure allows to overcome the limitations of the compositions described in the prior art, by providing a composition that does not lead to the deposition of a white residue in the hair, and at the same time providing high performance on sebum uptake.

[0017] The aerosol comprising the sprayable solution-based dry shampoo composition of the present disclosure does not requires the use of LPG (liquefied petroleum gas) as propellent gas for effective dispensing, therefore allowing to obtain more cost-effective and sustainable products, by using sustainable propellants (e.g., nitrogen or air) or by using pump mist packaging.

[0018] In an embodiment for better results, the sprayable solution-based dry shampoo composition is provided as an aerosol, wherein the aerosol comprising the sprayable solution-based dry shampoo composition of the present disclosure does not requires the use of LPG (liquefied petroleum gas) as propellent gas for effective dispensing, therefore allowing to obtain more cost-effective and sustainable products, by using sustainable propellants (e.g., nitrogen or air) or by using pump mist packaging.

[0019] The product developed allow to obtain a dry shampoo product wherein the spray is gentle and almost silent, as well as sustainable, costless, does not cause clogging and it is easier to manufacture in a commercial scale.

[0020] Using nitrogen as propellent agent provides several advantages, because nitrogen is in complete harmony with the environment (78% v / v of the air is nitrogen); it is non-flammable; it is not ozone depleting and it is inert, and therefore nitrogen is easy to handle and store, making industrial-scale manufacturing of the sprayable solution-based dry-shampoo composition of the present disclosure simpler and cost-effective.

[0021] In case of packaging in a propelled product (e.g., aerosol can or pump spray), the dry shampoo composition of the present disclosure surprisingly allows to increase the percentage of bulk (i.e., percentage of the composition without the propellant) in the can, up to 99.0 % (wbuik / wdryshampoo), wherein the average percentage of bulk in the can in the prior art is about 20% (wbuik / wdry shampoo).

[0022] The dry shampoo of the present disclosure eliminates the risk of clogging associated with suspended particles. This allows for consistent and reliable dispensing of the dry shampoo, ensuring a smooth and hassle-free user experience. Additionally, it provides effective cleansing properties as well as shelf-life stability.

[0023] An aspect of the present disclosure relates to a sprayable solution-based dry shampoo composition comprising 2-30 % (w / w) of an oil absorbent; 5-25 %(w / w) of ethanol; and water; wherein the oil absorbent is selected from the list consisting of: hydrophilic tapioca starch, hydrolysed corn starch, maltodextrin, or mixtures thereof.

[0024] In an embodiment for better results, the oil absorbent is hydrophilic tapioca starch.

[0025] In an embodiment for better results, the hydrophilic tapioca starch of the present disclosure is characterized by having an absorption capacity for a fatty substance greater than 1 ml / g (1 ml of fatty substance in 1 g of hydrophilic tapioca starch; preferably ranging from 2 to 4 ml / g.

[0026] In an embodiment for better results, the hydrophilic tapioca starch of the present disclosure is characterized by having an adsorption capacity (saturation) for a mineral oil above 200 % (% mineral oil adsorbed (w / w)); preferably ranging from 200 to 400 %; more preferably ranging from 200 to 300 %.

[0027] In an embodiment for better results, the hydrophilic tapioca starch of the present disclosure is characterized by a packed bulk density ranging from 0.08-0.20 (g / cm3) and a pH ranging from 6.5-8.0.

[0028] In an embodiment, the oil absorbent is hydrolysed corn starch.

[0029] In an embodiment for better results, the hydrolysed corn starch of the present disclosure is characterized by having a solubility in a solvent system of water and ethanol of 1:1:1.1 (w / w) (10g powder : 10g water : 11g ethanol).

[0030] In an embodiment, the oil absorbent is maltodextrin.

[0031] In an embodiment for better results, the maltodextrin of the present disclosure is characterized by having a solubility in a solvent system of water and ethanol of l:l:0.9 (w / w) (10g powder: 10g water: 9.0 g ethanol).

[0032] In an embodiment for better results, the dry shampoo composition comprises at least 40% (w / w) of water; preferably at least 50% (w / w) of water; more preferably at least 60% (w / w) of water; even more preferably at least 70% (w / w) of water.

[0033] In an embodiment for better results, the dry shampoo composition comprises 40-90% (w / w) of water; preferably 60-85% (w / w) of water; more preferably 70-80 % (w / w) of water.

[0034] In an embodiment for better results, the dry shampoo composition comprises 2-20 % (w / w) of oil absorbent.

[0035] In an embodiment for better results, the dry shampoo composition comprises 2-15 % (w / w) of oil absorbent.

[0036] In an embodiment for better results, the dry shampoo composition comprises 2-10 % (w / w) of oil absorbent.

[0037] In an embodiment for better results, the dry shampoo composition comprises 5-10 % (w / w) of oil absorbent.

[0038] In an embodiment for better results, the dry shampoo composition comprises 2-5 % (w / w) of oil absorbent.

[0039] In an embodiment for better results, the dry shampoo composition comprises 10-25 % (w / w) of ethanol; preferably 5-23 %(w / w); more preferably 5-20 %(w / w).

[0040] In an embodiment for better results, the dry shampoo composition comprises 10-20 %(w / w) of ethanol.

[0041] In an embodiment, the dry shampoo composition comprises 5-15 %(w / w) of ethanol.

[0042] In an embodiment, the dry shampoo composition comprises 5-10 %(w / w) of ethanol.

[0043] In an embodiment for better results, the sprayable solution-based dry shampoo composition of the present disclosure further comprises a propellant agent, preferably the propellant agent is selected from the list consisting of LPG, nitrous oxide, carbon dioxide, nitrogen or air. In a preferred embodiment for better results, the propellant agent is nitrogen or air. More preferably, the propellant agent is nitrogen.

[0044] In an embodiment for better results, the dry shampoo composition comprises at least 0.1 % (w / w dry shampoo) of propellent agent; preferably at least 0.3 % (w / w dry shampoo).

[0045] In an embodiment for better results, the dry shampoo composition comprises 0.1-5 % (w / w dry shampoo) of propellent agent; preferably 0.1-3 % (w / w dry shampoo); more preferably 0.3-3 % (w / w dry shampoo); even more preferably 0.3-2 % (w / w dry shampoo).

[0046] In an embodiment for better results, the dry shampoo composition comprises an amount of propellent agent able to provide a pressure (at 20°C) inside a packaging material ranging from 6-10 bar; preferably 7-9 bar; more preferably 7-8 bar.

[0047] In an embodiment for better results, the hydrophilic tapioca starch is hydrophilic tapioca starch having an adsorption capacity (saturation) for a mineral oil above 200 % (% mineral oil adsorbed (w / w)); preferably ranging from 200 to 400 %; more preferably ranging from 200 to 300 %; even more preferably 293% (the adsorption is measured by weighing the starch into a Hobart mixer, atomizing the oil onto the starch, mixing until homogeneous, and subjectively assessing the flow properties).

[0048] In an embodiment for better results, the dry shampoo composition of the present disclosure is absent of particles in suspension.

[0049] In an embodiment for better results, the dry shampoo composition of the present disclosure is a homogeneous solution.

[0050] In an embodiment for better results, the dry shampoo composition of the present disclosure further comprises at least a surfactant agent.

[0051] In an embodiment for better results, the dry shampoo composition of the present disclosure comprises 1-5% (w / w dry shampoo) of surfactant; preferably 0.5-3 % (w / w dry shampoo); more preferably 0.5-2 %

[0052] In an embodiment for better results, the surfactant is selected from the list consisting of caprylyl glucoside, heptyl glucoside, sophorolipid, or mixtures thereof. Preferably, the surfactant is heptyl glucoside.

[0053] In an embodiment for better results, the dry shampoo composition of the present disclosure further comprises at least a preservative.

[0054] In an embodiment for better results, the preservative is selected from the list consisting of potassium sorbate, salicylic acid, sodium sulphite, sodium benzoate, benzoic acid, or mixtures thereof.

[0055] In an embodiment for better results, the sprayable solution-based dry shampoo composition of the present disclosure further comprises at least a natural extract. Preferably the fragrance is selected from the list consisting of Mentha Piperita (Peppermint) Leaf Extract; Betula Alba Bark Extract; Rosmarinus Officinalis (Rosemary) Leaf Extract; Chamomilla Recutita (Matricaria) Flower Extract; Urtica Dioica (Nettle) Leaf Extract; Hamamelis Virginiana (Witch Hazel) Leaf Extract; Gleditsia Australis Seed Extract; Lamium Album Flower Extract; Panax Ginseng Root Extract; Eucalyptus Globulus Leaf Extract; Cucumis Sativus (Cucumber) Fruit Extract; Camellia Japonica Phytoplacenta Extract; Chamomilla Recutita (Matricaria) Flower Extract; Aloe Barbadensis Leaf Juice; Cucumis Sativus (Cucumber) Fruit Extract; Camellia Japonica Phytoplacenta Extract; Aloe Barbadensis Leaf Juice; Chamomilla Recutita (Matricaria) Flower Extract; or mixtures thereof.

[0056] Another aspect of the present disclosure relates to a product comprising the sprayable solutionbased dry shampoo composition herein described and a packaging material for packaging and delivering the dry shampoo composition, wherein the packaging material is a bag-on-valve, an aerosol can or a pump spray.

[0057] Preferably, the packaging material is an aerosol can or a pump spray.

[0058] Another aspect of the present disclosure relates to a product comprising the sprayable solutionbased dry shampoo composition herein described and a pump spray for delivering the dry shampoo composition as a spray.

[0059] In an embodiment for better results, the inner pressure of the pump spray at 20°C ranges from 6- 10 bar; preferably 7-9 bar; more preferably 7-8 bar.

[0060] In an embodiment for better results, the propellant is a compressed propellant selected from the list consisting of liquefied petroleum gas, nitrous oxide, carbon dioxide, nitrogen or air.

[0061] Preferably, the propellant is nitrogen or air; more preferably nitrogen.

[0062] In an embodiment for better results, the product is free of liquefied petroleum gas propellant.

[0063] Another aspect of the present disclosure relates to a method of cleaning hair, the method comprising applying the dry shampoo composition herein described to the hair.BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The following figures provide preferred embodiments for illustrating the disclosure and should not be seen as limiting the scope of invention.

[0065] Figure 1: Residue evaluation - Example 11.

[0066] Figure 2: Residue evaluation - Example 12.

[0067] Figure 3: Residue evaluation - Example 13.

[0068] Figure 4A-B: Residue evaluation - Comparative example "Invisidry Shampoo-Maria Nila".DETAILED DESCRIPTION

[0069] The present disclosure relates to cosmetic hair care products, namely to a sprayable solutionbased dry shampoo composition comprising 2-15 % (w / w) of an oil absorbent; 5-25 %(w / w) of ethanol; and water; wherein the oil absorbent is selected from the list consisting of: hydrophilic tapioca starch, hydrolysed corn starch, maltodextrin, or mixtures thereof. Furthermore, the present disclosure relates to a product comprising said dry shampoo composition.

[0070] As used herein, the term "sprayable solution-based dry shampoo composition" refers to a dry shampoo composition provided in liquid form, and which is suitable for delivery via a spray mechanism, namely through a non-aerosol pump spray or aerosol propellant system. The composition is homogeneous and stable.

[0071] As used herein, the terms "absorption" and "adsorption" are employed in the context of sebum reduction and may be used interchangeably. Both terms are intended to describe the material's capacity to remove sebum from the hair and / or scalp. While "adsorption" refers to the adherence of sebum onto the surface of a material and "absorption" denotes the uptake of sebum into the internal structure of the material, the present invention encompasses both mechanisms. Accordingly, references to "absorption" or "adsorption" throughout the specification shall be understood to include either or both processes, unless otherwise specified.EXAMPLES

[0072] In an embodiment for better results, the oil absorbent is hydrophilic tapioca starch (aqueous soluble tapioca starch). It is heated treated tapioca starch, wherein the heat treatment makes the tapioca starch more porous. It is characterized by the following adsorption characteristics:

[0073] Table 1. Characteristics of the hydrophilic tapioca starch of the present disclosure* The adsorption evaluations were done by weighing the starch into a Hobart mixer, atomizing the oil onto the starch, mixing until homogeneous, and subjectively assessing the flow properties.

[0074] In an embodiment for better results, the solubility of the hydrophilic tapioca starch of the present disclosure in a solvent system of water and ethanol is 1:1:0.7 (w / w) (10g powder : 10g water : 7g ethanol). Initially, the solute is dissolved in water and then ethanol is added. The ethanol should be added slowly, under vigorous stirring (with a vortex). The hydrophilic tapioca starch precipitates when adding 8g of ethanol.

[0075] The hydrophilic tapioca starch of the present disclosure is commercially available, for example, under the trade name Natrasorb® Bath starch, from the company Nouryon®.

[0076] In an embodiment for better results, the oil absorbent of the present disclosure is hydrolysed corn starch, commercially available and identified by CAS no. 268-616-4 and EINECS (European Inventory of Existing Commercial chemical Substances) no. 68131-37-3. In a preferred embodiment, the hydrolysed corn starch is produced by saccharification and spray-drying of corn starch, and is a free-flowing, slightly hygroscopic powder that solves readily in water, having the following properties:Dry substance: min. 95.0 % pH-value: 4.0 - 5.5DE-value (Dextrose Equivalent): 31.0 - 35.0 % in d.s. (in dry substance)Bulk density loose: 450 - 600 g / lSieve analysis > 0.4 mm: max. 0.5 %The solubility of hydrolysed corn starch in a solvent system of water and ethanol is 1:1:1.1 (w / w) (10g powder : 10g water : 11g ethanol). Initially, the solute is dissolved in water and then ethanol is added. The ethanol should be added slowly, under vigorous stirring (with a vortex). The hydrolysed corn starch precipitates when adding 12 g of ethanol.

[0077] The hydrolysed corn starch of the present disclosure is commercially available, for example, under the trade AGENABON 20.219, from the company AGRANA STARKE.

[0078] In an embodiment for better results, the oil absorbent of the present disclosure is maltodextrin, identified by CAS no. 9050-36-6 and EINECS no. 232-940-4. In a preferred embodiment, the maltodextrin is a spray-dried saccharification product, free-flowing, slightly hygroscopic powder that solves readily in water, having the following properties:Dry substance: min. 95.0 % pH-value: 4.0 - 5.5DE-value (Dextrose Equivalent): 18.0 - 20.0 % in d.s. (in dry substance)Bulk density loose: 450 - 600 g / lSieve analysis > 0.5 mm: max. 5 %Sulphate ash: approx. 0.2 % in d.s.The solubility of the maltodextrin in a solvent system of water and ethanol is l:l:0.9 (w / w) (10g powder: 10g water: 9.0 g ethanol). Initially, the solute is dissolved in water and then ethanol is added. The ethanol should be added slowly, under vigorous stirring (with a vortex). The maltodextrin precipitates when adding 10 g of ethanol.

[0079] The maltodextrin of the present disclosure is commercially available, for example, under the trade Agenamalt 20.222, from the company AGRANA STARKE.

[0080] Caprylyl glucoside is also known as caprylyl / capryl glucoside or Decyl D-gluco-hexopyranoside (IUPAC name) and is identified by CAS Number 68515-73-1.

[0081] The following Table 2 provides the general composition of the solvent-based dry shampoo composition of examples 1-17 of the present disclosure.

[0082] Table 2. General composition of the solvent-based dry shampoo composition of examples 1-17 of the present disclosure.

[0083] Other oil absorbents were tested: standard tapioca starch, rice starch, corn starch, aluminium starch octenyl-succinate, distarch phosphate, cellulose. Nonetheless, these oil absorbents proved to be inappropriate to be used in the composition of the present disclosure due to non-solubility in water and clogging issues.

[0084] Table 3-6 provides the composition of the solvent-based dry shampoo composition of comparative example 1 and examples 1-17 of the present disclosure. The results obtained in the assay "Ex Vivo Sebumeter test" (% sebum decrease) and volume increase (%) are also provided.

[0085] Table 3. Composition of the solvent-based dry shampoo composition of comparative example 1 and examples 1-5 of the present disclosure, packed in an aerosol comprising nitrogen (N2) as propellent agent.*The dry shampoo composition comprises an amount of nitrogen sufficient to obtain a pressure inside the aerosol can ranging from 7-8 bar at 20°C (in the present examples, said pressure was obtained using an amount of nitrogen ranging 0.3- 2% (wnitrogen / w dry shampoo).

[0086] Table 4. Composition of the solvent-based dry shampoo composition of examples (Ex.) 6-10 of the present disclosure, packed in an aerosol comprising nitrogen (N2) as propellent agent.*The dry shampoo composition comprises an amount of nitrogen sufficient to obtain a pressure inside the aerosol can ranging from 7-8 bar at 20°C (in the present examples, said pressure was obtained using an amount of nitrogen ranging 0.3- 2% (wnitrogen / w dry shampoo).

[0087] Table 5. Composition of the solvent-based dry shampoo composition of examples (Ex.) 11-13 of the present disclosure and comparative example 2.*The dry shampoo composition comprises an amount of nitrogen sufficient to obtain a pressure inside the aerosol can ranging from 7-8 bar at 20°C (in the present examples, said pressure was obtained using an amount of nitrogen ranging from 0.3- 2% (wnitrogen / w dry shampoo).** Comparative example 2 (benchmark) ingredients: Butane, Isobutane, Alcohol Denat, Propane, Oryza Sativa (Rice) Starch, Crambe Abyssinica Seed Oil, Helianthus Annuus (Sunflower) Seed Extract, Butylene Glycol, Cetrimonium Chloride, Parfum / Fragrance*** Residue Scale: 1 - low or no residue (microscopic evaluation), no residue under naked eye; 2 - very few white particles under microscopic evaluation, very low residue under naked eye; 3 - few white particles under microscopic evaluation (possible to count), low particles under naked eye; 4 - moderate white particles under microscopic evaluation (not possible to count) / white haze under naked eye; 5 - intense white particles; whitish hair

[0088] Table 6. Composition of the solvent-based dry shampoo composition of examples 14-17 of the present disclosure, packed in a pump spray.

[0089] The results obtained showed that the combination of specific oil absorbents and ethanol allow to maximize the efficacy of the composition in reducing sebum, while also providing high volume increase and low residue.

[0090] Examples 1 -5, comprising 5-10 % (w / w) of hydrophilic tapioca starch, showed the impact of the oil absorbent in sebum reduction and volume increase comparing with the comparative example.

[0091] Comparing the results provided by example 3 (comprising 20% (w / w) of ethanol) and example 2 (without ethanol), both containing the same amount of oil absorbent, reveals a significantly higher sebum reduction in Example 3. This result highlights an unexpected synergistic effect between ethanol and the oil absorbent, providing an improvement in sebum decrease from 48.57% to 60.00%, which represents a relative improvement of 23.5%.

[0092] Compositions 1-17 of the present disclosure, comprising 2.5-10% (w / w) of an oil absorbent selected from hydrophilic tapioca starch, hydrolysed corn starch, maltodextrin, and 10-25% (w / w) of ethanol, showed improved results in sebum uptake and volume increase.

[0093] Additionally, when the sprayable dry shampoo of the present disclosure was packed in an aerosol using nitrogen as propellent agent, clogging issues in the spray system were not observed. A smooth, silent and consistent spray was observed. Examples 6,7, and 8 showed that increasing the ethanol concentration from 10% (w / w) (Example 6) to 20% (w / w) (Example 7) did not lead to a significantly different efficacy. However, when the concentration was further increased to 25% (w / w) (Example 8), a decrease in sebum reduction performance was observed. This suggests that excessive ethanol concentrations (above 20%(w / w)), despite working, negatively affect performance.

[0094] Furthermore, comparison of Examples 7,9 and 10— testing 5% (w / w), 2.5% (w / w) and 7.5% (w / w) of oil absorbent, respectively— revealed that the formulation with 5% powder (Example 7) provided the best results in sebum reduction.

[0095] Examples 12 and 13, comprising hydrolyzed corn starch and maltodextrin, respectively, as oil absorbent, demonstrated that both ingredients also effectively reduce sebum and increase hair volume.

[0096] These findings are consistent with the earlier comparison between Examples 1 and 2, where an increase from 5% (w / w) to 10% (w / w) of hydrophilic tapioca starch did not yield an additional benefit. It is therefore concluded that 5% represents the optimal powder concentration for maximum sebum reduction.

[0097] Finally, among Examples 6 (10% (w / w) ethanol) and 7 (20% (w / w) ethanol), the formulation with 10% ethanol was found to be preferable from both a technical and sensory standpoint. This composition maintained its efficacy in sebum reduction while offering improved cosmetic qualities, such as a more pleasant feel to the touch and no noticeable increase in drying time as perceived by the user, and a cleaner, lighter visual appearance of the hair.

[0098] These results demonstrate that the efficacy of the composition of the present disclosure lies in the synergistic and optimized selection of ethanol and specific oil absorbents in a selected range of concentration, providing improved results of sebum decrease and volume increase.

[0099] Overall, all the tested formulations of the present disclosure exhibited a dual functional effect: (i) a significant reduction of scalp oiliness (sebum) and (ii) an increase in hair volume. The observed sebumreducing efficacy is comparable or superior to that of standard commercial dry shampoos, which typically rely on liquefied petroleum gas (LPG) as a delivery vehicle and / or generally lead to a visible residue in the hair.

[0100] Importantly, in addition to matching the performance of existing products, the present invention provides enhanced sensory benefits, notably the absence of visible white residues on the hair following application— an issue frequently associated with traditional dry shampoos. This feature represents a substantial technical advantage, particularly from the perspective of the end user, and contributes to the superior cosmetic and functional profile of the claimed compositions.

[0101] With respect to the residue test, microscopic evaluation of comparative example 2 revealed the presence of white particles deposited on the hair. In contrast, no such visible residues were observed in hair treated with the formulations of the present disclosure. It is noteworthy that the benchmark selected for comparison corresponds to a commercially available product marketed as an "invisible" dry shampoo.STABILITY STUDIESClogging Test

[0102] The purpose of this test method is to define the process to assess Clogging in Pressurized Products.

[0103] Clogging is a phenomenon that significantly impairs the aerosol function of dispensing the product.

[0104] It is required during the development phase, to confirm the product performance throughout the lifecycle of a pressurized product; confirming there is no risk of clogging or malfunctioning between formula and packaging (valve / actuator) combination.

[0105] In the clogging test, two different tests are carried out: Full Exhaust Test (FET) and Daily Simulation Test (DST), in order to confirm that the product has no risk of clogging during use. In the FET test, a total of 7 samples are placed in the oven, 3 samples at 259C and 4 samples at 409C, for a maximum of 2 weeks. After this time, the cans are completely discharged, with agitation during complete discharge.

[0106] In the DST test, 9 samples are placed in the oven, 3 samples at 259C and 6 samples at 409C. After this time, the samples are shaken and discharged daily for 5 seconds, shaken well and then for another 5 seconds, until they are completely discharged or a problem is detected. In the study carried out on Examples 11, 12 and 13, all the samples tested were completely discharged without any abnormalities in the spray. Therefore, no issues were detected in any of the samples tested.Preliminary Stability Test

[0107] This test is also known as the Screening Test, Stress Test or Crash test and it is aimed at providing assistance and orientation when choosing the formulations and packaging components. Due to the conditions under which it is conducted, this study does not have the goal of estimating the life cycle of the product but rather help in the screening of formulations and packaging materials. For this test, 3 samples of finished product and 1 sample of bulk (in a glass bottle) should be placed in the storage ovenat 409C during 15 days. After this time, samples are assessed according to the product specifications and respective acceptance criteria. Bulk and finished product specifications are measured and also packaging components are evaluated for possible issues of incompatibility between the bulk and the packaging.

[0108] Preliminary stability test was performed for Examples 12 and 13 according to the method described, and Tables 7-8 summarizes the results obtained:Table 7. Preliminary Stability Test - Example 12*Ful I Exhaust Test and Daily Simulation Test **Not performedTable 8. Preliminary Stability Test - Exemple 13:*Ful I Exhaust Test and Daily Simulation Test **Not performedShelf-life Stability & Compatibility

[0109] Accelerated stability and compatibility evaluation study, are designed to speed up naturally occurring destabilization processes due to intrinsic or extrinsic factors and which predicts the product behaviour over the long term.

[0110] With the data provided, it can be foreseen the stability of the product and the compatibility of the formulation with the containing packaging materials.

[0111]

[0066] In the test carried out, 4 samples of finished product and 1 bulk bottle are placed in an oven at 409C for IM. After this time, the samples are evaluated according to the product specifications and the respective acceptance criteria. The organoleptic characteristics are also compared with the retention sample stored at 59C. One of the finished product samples is used for microbiological control.

[0112] , Bulk and finished product specifications are measured and also packaging components are evaluated for possible issues of incompatibility between the bulk and the packaging.

[0113] Freeze & Thaw Tests are Cycling Tests in which the temperature is changed at regular intervals and which, therefore, subject the pack to varying rather than static stresses, are sometimes more severe tests than continuous storage tests. This test can provide evidence of product precipitation or deposition, and whether the reaction is reversible. This data is also applicable to determining how robust a product is to extreme fluctuations in temperature during distribution and storage.

[0114] For this test, 4 samples of finished product and 1 sample of bulk (in a glass bottle) are placed a temperature variation (or cycles of temperature) of -109C and 409C, during 7 days at each temperature, in a total of 2 cycles (28 days). After this time, samples are assessed according to the product specifications and respective Acceptance Criteria. Finished product specifications are measured and also packaging components are evaluated for possible issues of incompatibility bulk with packaging.

[0115] Accelerated stability test of IM and Freeze & Thaw test of 28 days (2 cycles) were performed for example 13 according to the method described, and these were the results obtained: Table 9 below provides stability data results for example 11 at 40°C.

[0116] Table 9. Stability data for example 11 at 40°C.**Not performedMATERIAL AND METHODSAerosol packaging- Actuator

[0117] The actuator of the aerosol used in the examples of the present disclosure is commercialized byCoster Tecnologie Speciali S.p.A under the internal code V06.203 and has the following specifications:- orifice diameter: 0.30mm- orifice thickness: 0.20mm- number of channels: 3 and channel's dimensions: 0.20x0.25mmEx Vivo Sebumeter test - Sebum Reduction

[0118] Table 10. EquipmentMaterials: Hair Tresses (Virgin, Type 1); Solution of Sodium Laureth Sulfate (SLS) 7% (w / w, in water); Millimetric Paper; Synthetic sebumTest Conduction Parameters - Ex Vivo Sebumeter test - Sebum Reduction• n = x hair tresses, x=total number of hair tresses needed to conduct the study with statistical analysis, evaluated on the efficacy of sebum reduction after cosmetic product application;• Hair tresses are washed with SLS solution 7%(w / w) and dried;• 2% Synthetic Sebum is applied in relation to the mass of hair tress using a standard application method;• Products are randomized accordingly;• The product is applied to the hair tress in a 1:2 ratio;• The sebum of each hair tress is evaluated before (to) and after product application (tf) using Sebumeter on 5 stated locations;• The sebum decrease is calculated using the Equation:% Sebum decrease = tf x 100) -j- tO) — 100)Volume enhancement (% volume increase)

[0119] Millimetric Assessment - Volume enhancement - Ex Vivo Internal Method• n = x hair tresses, x=total number of hair tresses needed to conduct the study with statistical analysis, evaluated on the efficacy of volume enhancement after cosmetic product application;• Hair tresses are washed with SLS solution 7%(w / w) and dried;• 2% Synthetic Sebum is applied in relation to the mass of hair tress using a standard application method;• Products are randomized accordingly;• Hair Tress is placed on millimetric paper and the width of each hair tress is measured on 7 sites (to) •The product is applied to the hair tress in a 1:2 ratio;• The width of each hair tress is measured on 7 sites (tf);•The volume increase is calculated according to the Equation:% Volume decrease = tf x 100) -j- tO) — 100)Residue

[0120] Residue test:• n = x hair tresses, x=total number of hair tresses needed to conduct the study with statistical analysis, evaluated residue after cosmetic product application;• Hair tresses are washed with SLS solution 7%(w / w) and dried;• 2% Synthetic Sebum is applied in relation to the mass of hair tress using a standard application method;• Products are randomized accordingly;•The product is applied to the hair tress in a 1:2 ratio;• The Hair tress is evaluated under naked eye and under microscopic evaluation (Digital Microscope VHX-970F, Keyence)• The residue is scored according to the scale:1 - low or no residue (microscopic evaluation), no residue under naked eye;2 - very few white particles under microscopic evaluation, very low residue under naked eye; 3 - few white particles under microscopic evaluation (possible to count), low particles under naked eye;4 - moderate white particles under microscopic evaluation (not possible to count) / white haze under naked eye;5 - intense white particles; whitish hair

[0121] As used in the specification and claims, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. For example, the term "a sample" includes a plurality of samples, including mixtures thereof.

[0122] Whenever the term "at least," "greater than," or "greater than or equal to" precedes the first numerical value in a series of two or more numerical values, the term "at least," "greater than" or "greater than or equal to" applies to each of the numerical values in that series of numerical values. For example, greater than or equal to 1, 2, or 3 is equivalent to greater than or equal to 1, greater than or equal to 2, or greater than or equal to 3.

[0123] The terms "determining," "measuring," "evaluating," "assessing," "assaying," and "analyzing" are often used interchangeably herein to refer to forms of measurement. The terms include determining if an element is present or not (for example, detection). These terms can include quantitative, qualitative orquantitative and qualitative determinations. Assessing can be relative or absolute. "Detecting the presence of" can include determining the amount of something present in addition to determining whether it is present or absent depending on the context.

[0124] As used herein, the term "about" a number refers to that number plus or minus 10% of that number. The term "about" a range refers to that range minus 10% of its lowest value and plus 10% of its greatest value.

[0125] As used herein, the terms "pharmaceutically acceptable" and "cosmetically acceptable" are used interchangeably and refer to those compounds, materials, compositions, and / or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problems or complications commensurate with a reasonable benefit / risk ratio. More specifically, pharmaceutically acceptable refers to a material, compound, or composition which is suitable for use in contact with the skin, scalp, or hair. Pharmaceutically acceptable materials are known to those of ordinary skill in the art.

[0126] Furthermore, where the claims recite a composition, it is to be understood that methods of using the composition for any of the purposes disclosed herein are included, and methods of making the composition according to any of the methods of making disclosed herein or other methods known in the art are included, unless otherwise indicated or unless it would be evident to one of ordinary skill in the art that a contradiction or inconsistency would arise.

[0127] Where ranges are given, endpoints are included. Furthermore, it is to be understood that unless otherwise indicated or otherwise evident from the context and / or the understanding of one of ordinary skill in the art, values that are expressed as ranges can assume any specific value within the stated ranges in different embodiments of the invention, to the tenth of the unit of the lower limit of the range, unless the context clearly dictates otherwise. It is also to be understood that unless otherwise indicated or otherwise evident from the context and / or the understanding of one of ordinary skill in the art, values expressed as ranges can assume any subrange within the given range, wherein the endpoints of the subrange are expressed to the same degree of accuracy as the tenth of the unit of the lower limit of the range.The term "comprising" whenever used in this document is intended to indicate the presence of stated features, integers, steps, components, but not to preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

[0128] The disclosure should not be seen in any way restricted to the embodiments described and a person with ordinary skill in the art will foresee many possibilities to modifications thereof. The abovedescribed embodiments are combinable.

[0129] The following dependent claims further set out particular embodiments of the disclosure.

Claims

C L A I M S1. Sprayable solution-based dry shampoo composition comprising:2-30 % (w / w) of an oil absorbent;5-25 %(w / w) of ethanol; and water; wherein the oil absorbent is selected from the list consisting of: hydrophilic tapioca starch, hydrolysed corn starch, maltodextrin, or mixtures thereof.

2. Dry shampoo composition according to the previous claim wherein the oil absorbent is hydrophilic tapioca starch.

3. Dry shampoo composition according to the previous claim 1 wherein the oil absorbent is hydrolysed corn starch.

4. Dry shampoo composition according to the previous claim 1 wherein the oil absorbent is maltodextrin.

5. Dry shampoo composition according to any of the previous claims comprising 2-20 % (w / w) of oil absorbent.

6. Dry shampoo composition according to the previous claim comprising 2-15 % (w / w) of oil absorbent.

7. Dry shampoo composition according to the previous claim comprising 2-10 % (w / w) of oil absorbent; preferably 5-10 (w / w).

8. Dry shampoo composition according to the previous claim comprising 2-5 % (w / w) of oil absorbent.

9. Dry shampoo composition according to any of the previous claims comprising 5-20 %(w / w) of ethanol.

10. Dry shampoo composition according to any of the previous claims comprising 10-20% (w / w) of ethanol.

11. Dry shampoo composition according to the previous claim comprising 5-15 %(w / w) of ethanol; preferably 5-10 %(w / w).

12. Dry shampoo composition according to any of the previous claims further comprising a propellant agent.

13. Dry shampoo composition according to the previous claim wherein the propellant agent is selected from the list consisting of LPG, nitrous oxide, carbon dioxide, nitrogen or air.

14. Dry shampoo composition according to the previous claim wherein the propellant agent is nitrogen or air; preferably nitrogen.

15. Dry shampoo composition according to any of the previous claims 12-14 comprising at least 0.1 % (VJ / VJ dry shampoo) of propellent agent.

16. Dry shampoo composition according to the previous claim at least 0.3 % (VJ / VJ dryshampoo) of propellent agent.

17. Dry shampoo composition according to the previous claim comprising 0.1-5 % (VJ / VJ dry shampoo) of propellent agent.

18. Dry shampoo composition according to the previous claim comprising 0.1-3 % (VJ / VJ dry shampoo) of propellent agent.

19. Dry shampoo composition according to the previous claim comprising 0.3-3 % (VJ / VJ dry shampoo) of propellent agent.

20. Dry shampoo composition according to the previous claim comprising 0.3-2 % (VJ / VJ dry shampoo) of propellent agent.

21. Dry shampoo composition according to the previous claim 2 wherein the hydrophilic tapioca starch is hydrophilic tapioca starch having an absorption capacity for a mineral oil above 200 % (% mineral oil adsorbed (VJ / VJ)); preferably ranging from 200 to 400 %; more preferably ranging from 200 to 300 ° / o.

22. Dry shampoo composition according to any of the previous wherein the dry shampoo is absent of suspended particles.

23. Dry shampoo composition according to any of the previous claims comprising at least a surfactant agent.

24. Dry shampoo composition according to the previous claim comprising 0.1-5% (w / w dry shampoo) of surfactant; preferably 0.5-3 % (w / w dry shampoo); more preferably 0.5-2 % (w / w dry shampoo).

25. Dry shampoo composition according to any of the previous claims 23-24 wherein the surfactant is selected from the list consisting of caprylyl glucoside, heptyl glucoside, sophorolipid, or mixtures thereof.

26. Dry shampoo composition according to the previous claim wherein the surfactant agent is heptyl glucoside.

27. Dry shampoo composition according to any of the previous claims further comprising at least a preservative.

28. Dry shampoo composition according to the previous claim wherein the preservative is selected from the list consisting of potassium sorbate, salicylic acid, sodium sulphite, sodium benzoate, benzoic acid, or mixtures thereof.

29. Dry shampoo composition according to any of the previous claims further comprising at least an extract.

30. Dry shampoo composition according to the previous claim wherein the extract is selected from the list consisting of Mentha Piperita Leaf Extract; Betula Alba Bark Extract; Rosmarinus Officinalis Leaf Extract; Chamomilla Recutita Flower Extract; Urtica Dioica Leaf Extract; Hamamelis Virginiana Leaf Extract; Gleditsia Australis Seed Extract; Lamium Album Flower Extract; Panax Ginseng Root Extract; Eucalyptus Globulus Leaf Extract; Cucumis Sativus Fruit Extract; Camellia Japonica Phytoplacenta Extract; Aloe Barbadensis Leaf Juice; or mixtures thereof.

31. Product comprising the sprayable solution-based dry shampoo composition according to any of the previous claims and a packaging material for packaging and delivering the dry shampoo composition, wherein the packaging material is selected from the list consisting of: a bag-on-valve an aerosol can or a pump spray.

32. Product comprising the sprayable solution-based dry shampoo composition according to any of the previous claims 1-30 and a pump spray for delivering the dry shampoo composition as a spray.

33. Product according to any of the previous claims 31-32 wherein the inner pressure of the pump spray ranges from 6-10 bar; preferably 7-9 bar; more preferably 7-8 bar, when measured at 20°C.

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