Dry shampoo products having less than 55% volatile organic compounds

Abstract

A dry shampoo product that can contain a carrier containing a volatile silicone having a viscosity of 1 cst or less, an oil-absorbing starch dispersed in the volatile silicone carrier, and a propellant. The dry shampoo product can have 55% by weight or less of volatile organic compounds of the dry shampoo product while also providing acceptable product performance.

Description

Technical Field

[0001] A dry shampoo product comprising a carrier and starch absorbent dispersed in a propellant, particularly an aerosol dry shampoo product having 55% or less volatile organic compounds.

Background Art

[0002] Many consumers use dry shampoos that do not require the use of water to reduce oil and dirt on the hair and scalp between washings. Consumers desire dry shampoos that are quick-drying, easy to apply, do not make the hair look or feel greasy, and leave no residue.

[0003] Typical dry shampoo products contain ethanol (a volatile organic compound, i.e., VOC) as a carrier, one or more sebum-absorbing powders, and a hydrocarbon propellant (also referred to as VOC), and thus these products typically have a VOC content of 80 - 90%. However, there is pressure from both regulations and consumers to reduce the concentration of VOCs in dry shampoo products to 55% or less, preferably 50% or less.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Therefore, there is a need for a dry shampoo product that has 50% or less VOC, dries quickly, effectively reduces oil on the user's hair and scalp, and leaves no significant residue.

Means for Solving the Problems

[0005] A dry shampoo product comprising: (a) a carrier comprising a volatile silicone having a viscosity of 1 cst or less; (b) starch absorbent dispersed in the volatile silicone carrier; and (c) a propellant, wherein the dry shampoo product comprises 55% by weight or less volatile organic compounds of the dry shampoo product.

[0006] An aerosol hair care product, comprising: (a) an aerosol container including a pressurizable container and an actuator; and (b) a dry shampoo product disposed within the pressurizable container, the dry shampoo product comprising: (i) a dry shampoo composition comprising: (1) a carrier comprising hexamethyldisiloxane having a viscosity of 0.65 cst or less; and (2) oil-absorbing starch dispersed in the hexamethyldisiloxane volatile silicone carrier; and (ii) a propellant, wherein the dry shampoo product comprises 55% by weight or less of volatile organic compounds of the dry shampoo product, and the aerosol personal care product is pressurized to above about 50 psig.

BEST MODE FOR CARRYING OUT THE INVENTION

[0007] The dry shampoo product is a spray hair product that reduces the appearance of oil and dirt on the user's hair and / or scalp. Unlike conventional shampoos and conditioners, dry shampoos can be applied to dry hair and do not need to be rinsed. This is frequently used to refresh the hair between washings.

[0008] Typical dry shampoo products contain 80 - 90% VOC content. Ethanol (VOC) is generally used as the bulk phase, which suspends the oil-absorbing particles, helps deliver them to the user's hair and scalp, absorbs moisture and oil from the user's hair and scalp, and dries it quickly at the same time. The propellant is generally a hydrocarbon (another VOC) that acts as a solvent within the aerosol package. When the actuator button is pressed, the valve opens, and since the pressure outside the can is lower than the pressure inside, the propellant expands, pushing the product up the dip tube and out of the valve as a fine mist.

[0009] There are pressures from both regulations and consumers to reduce the concentration of VOCs in dry shampoo products to 55% or less, preferably 50% or less. This requires reformulation to remove some or all of the ethanol carrier and / or hydrocarbon VOC propellant.

[0010] Some products can be replaced with hydrocarbon propellants, which are liquefied gas propellants known to have propellant characteristics similar to hydrocarbon VOC propellants rather than VOCs, such as HFC-152a propellant (1,1-difluoroethane). However, there is also some regulatory pressure and consumer pressure to avoid using this propellant. Therefore, this is not a preferred solution for the dry shampoo products described herein.

[0011] Since ethanol is the key to providing important performance attributes to the dry shampoo formulation, its removal and replacement are difficult. These performance attributes include the following. · Fast drying time / rapid evaporation resulting in a non-wet hair feel · Ability to dissolve scalp oil for the appearance advantage of a clean dry shampoo · Odorless · Low viscosity · Low surface tension · Compatible with most surfaces

[0012] By using hexamethyldisiloxane (HMDS), the lowest molecular weight linear volatile silicone having a viscosity of 1 cSt or less, preferably 0.65 cSt or less, as a carrier in the dry shampoo product, it has been found that a product with acceptable performance for consumers having 55% or less VOC, preferably 50% or less VOC, can be created. Dry shampoo products with an HMDS carrier can provide benefits such as conditioning and / or smoothing and / or reducing frizz to the user's hair. Another advantage of HMDS is that while conventional ethanol-based dry shampoos feel cold when dispensed, the droplets feel like room temperature when applied to the hair. The viscosity can be determined according to the viscosity test method described herein.

[0013] Interestingly, HMDS may be used as a minor component at low levels (i.e., much less than 20%) in hair care formulations including ethanol and water-based hair styling products. However, it was unexpected that HMDS, a silicone material that some users consider to make hair feel heavy and greasy, would function well as a carrier for dry shampoo aerosol sprays. The main advantage of dry shampoo products is to absorb hair oil and reduce the appearance of greasy roots. Therefore, it is not intuitive to add a silicone oil carrier for this purpose.

[0014] Dry shampoo products (i.e., dry shampoo compositions and propellants) can contain ≥20%, or ≥25%, or ≥30%, or ≥35%, or ≥40% of HMDS. Dry shampoo products can contain from about 20% to about 60%, or from about 25% to about 55%, or from about 30% to about 50%, or from about 35% to about 45%, or from about 38% to about 43% of HMDS.

[0015] The dry shampoo composition can be formulated without, substantially without, or without polymers including, but not limited to, ethanol, water, surfactants, parabens, propellant 152a (1,1-difluoroethane), and / or film-forming polymers.

[0016] The ejected composition can contain particles having an average particle size distribution (Dv50) of about 5 μm to about 250 μm, or about 10 μm to about 225 μm. The average particle size distribution (Dv50) is determined by the particle size distribution test method described below. Such an average particle size distribution is useful for providing an optimal drying time for the hair because the particles of the ejected composition spread sufficiently over the hair and there is sufficient oil-absorbing starch in each particle (droplet) to provide sufficient oil absorption capacity for the hair and scalp.

[0017] The spraying rate of the ejected composition can be about 0.4 g / s to about 0.9 g / s, or about 0.45 g / s to about 0.75 g / s, or about 0.5 g / s to about 0.7 g / s, or about 0.55 g / s to about 0.7 g / s, or about 0.57 g / s to about 0.65 g / s. The spraying rate can be determined by the delivery rate test method described herein. The ejected composition can deliver oil-absorbing starch at about 0.025 g / s to about 0.2 g / s, or about 0.05 g / s to about 0.15 g / s, or about 0.06 g / s to about 0.1 g / s, or about 0.07 g / s to about 0.08 g / s, or about 0.075 g / s. The amount of oil-absorbing starch can be determined according to the delivery rate test method described herein.

[0018] The pressure in the aerosol container may be greater than 50 psig. The pressure in the aerosol container can be about 40 psig to about 85 psig, or about 45 psig to about 80 psig, or about 50 psig to about 75 psig, or about 55 psig to about 70 psig according to the pressure test method described herein.

[0019] The dry shampoo composition can have a viscosity of ≧800 cP, or ≧1250 cP, or ≧3000 cP, or ≧5000 cP. The dry shampoo composition can have a viscosity of about 1000 cP to about 12,000 cP. The viscosity can be determined by the viscosity test method described herein.

[0020] The dry shampoo composition can give a dry feel within 10 seconds, or within 7 seconds, or within 5 seconds after being applied to the hair.

[0021] In some examples, a dry shampoo product and / or a dry shampoo composition can have a limited number of ingredients, particularly a limited number of ingredients that need to be reported on the package in an INCI (International Nomenclature Cosmetic Ingredient) statement. The composition can have 25 or fewer ingredients, or 20 or fewer ingredients, or 15 or fewer ingredients, or 12 or fewer ingredients, or 10 or fewer ingredients, or 8 or fewer ingredients.

[0022] Unless otherwise specifically stated, all percentages are by weight of the cosmetic composition. Unless otherwise specifically stated, all ratios are weight ratios. All ranges include endpoints and are combinable. The significant digits do not represent a limitation on the quantity shown nor on the accuracy of the measured value. Unless otherwise specifically indicated, all quantities are understood to be modified by the term "about". Unless otherwise indicated, all measurements are understood to have been made under ambient conditions of approximately 21°C, and "ambient conditions" means conditions of about 1 atmosphere and about 50% relative humidity. All numerical ranges include narrower ranges. The separated upper and lower range limits are compatible in creating further ranges that are not explicitly separated.

[0023] Definitions As used herein, "formulated without" means that the ingredient is not intentionally added. However, because there may be trace amounts of contaminants, "formulated without" does not guarantee "100% free".

[0024] As used herein, "hair" means mammalian hair, including scalp hair, facial hair, and body hair, specifically human head and scalp hair.

[0025] As used herein, "volatile" means a material that is liquid under ambient conditions and has a measurable vapor pressure at 25°C. Specifically, this material has a boiling point of about 260°C or less, preferably about 200°C or less, more preferably about 150°C or less, and most preferably 100°C or less at 1 atm.

[0026] Unless specifically stated otherwise, all percentages are by weight of the cosmetic composition. Unless specifically stated otherwise, all ratios are weight ratios. All ranges include endpoints and are combinable. The number of significant digits does not represent a limitation on the quantity shown or on the accuracy of the measured value. Unless specifically indicated otherwise, all quantities are understood to be modified by the term "about". Unless otherwise indicated, all measurements are understood to have been made under ambient conditions of approximately 25°C, and "ambient conditions" means conditions of about 1 atmosphere and about 50% relative humidity. All numerical ranges include narrower ranges. The separated upper and lower range limits are compatible in creating further ranges that are not explicitly separated.

[0027] Dry shampoo composition The dry shampoo composition can include an HMDS carrier and oil-absorbing starch. The dry shampoo composition can also contain optional ingredients including rheology modifiers, polar active agents, fragrances, and other minor components.

[0028] The dry shampoo composition can have a pH of about 3 to about 9, or about 4 to about 6.

[0029] Oil-absorbing starch The dry shampoo product (i.e., the dry shampoo composition and the propellant) can contain about 1 wt% to about 15 wt%, or about 3 wt% to about 12 wt%, or about 6 wt% to about 10 wt% of oil-absorbing starch based on the weight of the dry shampoo product. The oil-absorbing starch can be dispersed in the carrier.

[0030] Non-limiting examples of oil-absorbing starches suitable for dry shampoos can include rice starch, corn starch (also known as maize starch), potato starch, silica, clay, and / or tapioca starch. Additional starches that may be suitable for the present invention can be found in U.S. Patent Application Publication No. 2016 / 0317396, which is incorporated by reference.

[0031] In some examples, the oil-absorbing starch can be particulate tapioca starch. The particulate tapioca starch may be selected from the group consisting of hydrophobically modified particulate tapioca starch, unmodified particulate tapioca starch, and combinations thereof. The ratio of hydrophobically modified particulate tapioca starch to unmodified particulate tapioca starch may be 2:1 or greater.

[0032] Hydrophobically modified particulate tapioca starch can be produced by various methods including those described in U.S. Patent Nos. 7,375,214, 7,799,909, 6,037,466, 2,852,404, 5,672,699, and 5,776,476.

[0033] The modified tapioca particulate starch may be organically modified particulate tapioca starch or silicone grafted particulate tapioca starch. Silicone grafted particulate tapioca starch can be purchased under the trade name Dry Flo TS and the INCI name tapioca starch polymethylsilsesquioxane. Silicone modified particulate tapioca starch can be produced by the reaction of sodium methyl silicate (polymethylsilsesquioxane) with tapioca starch. The particulate tapioca starch can be supplied from the roots of cassava by standard means known in the art. An example of a commercially available silicone modified particulate tapioca starch has a CAS number of 68989-12-8.

[0034] Rheology modifier In some examples, the dry shampoo composition can include one or more rheology modifiers. The dry shampoo product (i.e., the dry shampoo composition and the propellant) can include from about 0.5% to about 3%, or from about 0.75% to about 2%, or from about 1% to 1.75%, or from about 1.25% to about 1.5% of the rheology modifier.

[0035] The dry shampoo composition can include a rheology modifier that may be a water-swellable clay, and non-limiting examples include laponite, bentolite, montmorillonite, smectite, and hectorite.

[0036] The rheology modifier may be an alginic acid-based substance, and non-limiting examples can include sodium alginate and propylene glycol alginate.

[0037] The rheology modifier may be a homopolymer based on acrylic acid, methacrylic acid, or other related derivatives, and non-limiting examples can include polyacrylate, polymethacrylate, polyethyl acrylate, and polyacrylamide.

[0038] The rheology modifier may be a cross-linked acrylic polymer, and non-limiting examples can include carbomer.

[0039] The rheology modifier may be an associative polymer thickener. Non-limiting examples include hydrophobically modified cellulose derivatives; hydrophobically modified alkoxylated urethane polymers (non-limiting examples include PEG-150 / decyl alcohol / SMDI copolymer, PEG-150 / stearyl alcohol / SMDI copolymer, polyurethane-39); hydrophobically modified alkali-swellable emulsions (non-limiting examples include hydrophobically modified polyacrylate, hydrophobically modified polyacrylic acid, and hydrophobically modified polyacrylamide); hydrophobically modified polyethers. These substances may have a hydrophobic substance selected from cetyl, stearyl, oleayl, and combinations thereof, and a hydrophilic moiety of repeating ethylene oxide groups having 10 to 300, in another embodiment 30 to 200, and in a further embodiment 40 to 150 repeating units. Non-limiting examples of this class include PEG-120-methylglucose dioleate, PEG-(40 or 60) sorbitan tetraoleate, PEG-150 pentaerythrityl tetrastearate, PEG-55 propylene glycol oleate, PEG-150 distearate.

[0040] The rheology modifier may be cellulose and derivatives. Non-limiting examples include microcrystalline cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, ethyl cellulose, nitrocellulose, cellulose sulfate, cellulose powder, hydrophobically modified cellulose.

[0041] The rheology modifier may be guar and guar derivatives. Non-limiting examples include hydroxypropyl guar, and hydroxypropyl guar hydroxypropyltrimonium chloride.

[0042] The rheology modifier may be dibenzylidene sorbitol, carrageenan, pectin, agar, quince seeds (Cydonia oblonga Mill), starch derivatives (e.g., carboxymethyl starch, methyl hydroxypropyl starch), algal extracts, dextran, succinoglucan, and pullulan.

[0043] The rheology modifier may be polyethylene oxide, polypropylene oxide, and a POE-PPO copolymer.

[0044] The rheology modifier may be polyvinylpyrrolidone, crosslinked polyvinylpyrrolidone, and derivatives. In a further embodiment, the rheology modifier may be polyvinyl alcohol and derivatives.

[0045] The rheology modifier may be polyethyleneimine and derivatives.

[0046] The rheology modifier may be silica, and non-limiting examples include fumed silica, precipitated silica, and silicone surface-treated silica.

[0047] Additional rheology modifiers that may be used are disclosed in U.S. Patent No. 11,129,780 and are incorporated by reference.

[0048] Polar active agent In some examples, the dry shampoo composition can include one or more polar active agents. The dry shampoo product (i.e., the dry shampoo composition and the propellant) can include from about 0.1% to about 1%, or from about 0.2% to about 0.8%, or from about 0.3% to 0.7%, or from about 0.4% to about 0.6% of the polar active agent.

[0049] Non-limiting examples of polar active agents can include methanol, ethanol, acetone, propylene carbonate, water, triethyl citrate, propylene carbonate, or combinations thereof.

[0050] When a rheology modifier and / or a polar activator is included in the formulation, a dry shampoo product can have better uniformity of oil-absorbing starch suspended in the carrier compared to a dry shampoo product that does not contain a rheology modifier.

[0051] Optional ingredients The dry shampoo compositions described herein may also optionally contain any other suitable optional ingredients. For example, the hair care composition may contain other active or inactive ingredients.

[0052] The dry shampoo composition can include natural oils such as olive oil, argan oil, jojoba oil, passion fruit oil, etc.

[0053] The dry shampoo composition can include scalp health actives to provide a scalp effect. This group of materials varies and provides a wide range of effects including dandruff prevention, antifungal, antibacterial, moisturizing, barrier improvement, as well as antioxidant, anti-itch, and sensory stimulation. Such health actives include, but are not limited to, zinc pyrithione, climbazole, octopirox, vitamins E and F, salicylic acid, glycols, glycolic acid, PCA, PEG, erythritol, glycerin, lactate, hyaluronate, allantoin and other ureas, betaine, sorbitol, glutamic acid, xylitol, menthol, menthyl lactate, isocyclomenthone, benzyl alcohol, and natural extracts / oils including peppermint, spearmint, argan, jojoba, and aloe. The composition may also contain other common hair ingredients.

[0054] A variety of non-limiting substances that can be added to the compositions of this specification are described in the CTFA Cosmetic Ingredient Handbook, Tenth Edition (published by the Cosmetic, Toiletry, and Fragrance Association, Inc. (Washington, D.C.)) (2004) (hereinafter referred to as "CTFA"). Examples of these ingredient classes include, but are not limited to, fragrances, pigments, dyes / colorants, essential oils, sensory agents, defoamers, antibacterial agents, biological additives, buffers, extenders, chelating agents, chemical additives, astringents, biocides, film-forming agents or materials, pH adjusters, reducing agents, sequestering agents, and surfactants and other cosmetic ingredients.

[0055] Compressed propellant The dry shampoo products described herein (i.e., dry shampoo compositions and propellants) can comprise from about 15% to about 85% by weight, or from about 20% to about 80% by weight, or from 30% to about 70% by weight, or from about 40% to about 65% by weight, or from about 49% to about 55% by weight of the dry shampoo products (i.e., dry shampoo compositions and propellants).

[0056] The propellant may comprise one or more volatile substances which, in the gaseous state, can carry the other components of the dry shampoo composition in particulate or droplet form. The propellant can have a boiling point within the range of about -45°C to about 5°C. The propellant can be liquefied when packaged under pressure in a conventional aerosol container. The rapid boiling of the propellant as it exits the aerosol foam dispenser can aid in the atomization of the other components of the dry shampoo product.

[0057] Examples of aerosol propellants that can be used in dry shampoo products include chemically inert hydrocarbons such as propane, n-butane, isobutane, cyclopropane, and mixtures thereof, and halogenated hydrocarbons such as dichlorodifluoromethane, 1,1-dichloro-1,1,2,2-tetrafluoroethane, 1-chloro-1,1-difluoro-2,2-trifluoroethane, 1-chloro-1,1-difluoroethylene, 1,1-difluoroethane, dimethyl ether, monochlorodifluoromethane, trans-1,3,3,3-tetrafluoropropene, and mixtures thereof. The propellant may contain hydrocarbons such as isobutane, propane, and butane, and these substances can be used because of their low ozone reactivity. When the vapor pressure ranges from about 1.17 bar to about 7.45 bar, or from about 1.17 bar to about 4.83 bar, or from about 2.14 bar to about 3.79 bar at 21.1 °C, they can be used as individual components.

[0058] Usage The dry shampoo product can be used to wash and / or refresh the hair in 60 seconds or less. The dry shampoo product can remove visible residues and excess oil from any hair type. The dry shampoo product can be sprayed on dry or wet hair. The spray should be held about 8 to about 12 inches from the place where the droplets are intended to land. The dry shampoo can be sprayed on any part of the hair from the roots to the tips. In some examples, the dry shampoo is sprayed on the roots and worked into the roots. In other examples, the dry shampoo is sprayed on the hair and combed through. The dry shampoo is not rinsed out.

[0059] Packaging An aerosol hair care product can include an aerosol dispenser having a pressurizable outer container that can be used with such a dispenser. The outer container can include plastic or metal. The outer container can have an opening. The opening is typically at the top of the pressurizable container when the pressurizable container is in its use position. The opening defines a neck portion where other components can be sealed.

[0060] The valve cup can be sealed against the opening of the outer container. Subsequently, the valve assembly can be disposed within the valve cup. The valve assembly holds a dry shampoo product (dry shampoo composition and propellant) within the aerosol dispenser until the dry shampoo product is selectively dispensed by the user. The valve assembly can be selectively actuated by an actuator. By selectively actuating the valve assembly, the user can dispense a desired amount of the dry shampoo composition as needed. Additional details and examples regarding aerosol dispensers can be found in U.S. Patent No. 9,505,509, which is incorporated by reference (see, for example, FIG. 2B showing an aerosol dispenser having a dip tube and the accompanying text).

[0061] Test Methods Delivery Rate Test Method The delivery rate of the aerosol hair spray product of this specification is determined in accordance with ASTM D 3069-94, "Standard Test Method for Delivery Rate of Aerosol Products". In this test, the delivery rate of the product is determined by measuring the mass lost over a given period. This correlates to the amount of material released through the combination of the valve and actuator within a given time. In this case, the can is tested at room temperature (21 °C) for a duration of 2 seconds to 10 seconds for the actuation time. The delivery rate (also referred to as the spray rate) is then determined by the following formula. Delivery Rate (g / s) = Mass Loss (g) / Actuation Time (s)

[0062] The delivery rate of the oil-absorbing starch is determined by the following formula. Delivery rate of oil-absorbing starch (g / s) = Delivery rate (g / s) * % of oil-absorbing starch in the dry shampoo product

[0063] Oil absorption test method Wash a 5 g, 8-inch straight hairpiece with Pantene (registered trademark) Nutrient Blends Pure Clean & Clarify Silicone-Free Shampoo and hang it to air dry. Use at least one hairpiece for each dry conditioner composition being tested, with at least one hairpiece being a negative control and at least one being a positive control. The positive control is a clean, untreated hairpiece.

[0064] Weigh 0.05 g of artificial sebum per gram of hair. While wearing gloves, apply the artificial sebum to the fingertips and rub the fingertips together using both hands to dissolve the sebum. Apply the sebum downward on both the front and back of the suspended hairpiece, then apply milk into the hair for 10 - 15 seconds (moving the hands alternately). Place the sebum-treated hairpiece between two sheets of foil. Blow-dry each side of the hairpiece for 30 seconds. This ensures a uniform distribution of sebum across the hairpiece. Hang the hairpiece.

[0065] While ensuring that the hair is evenly distributed between the teeth of the comb, create at least one negative control by passing a wide-tooth comb through one of the hairpieces. Move the comb slowly down the hair swatch once to create a brush line.

[0066] Repeat the above steps for the hairpiece treated with dry shampoo. Spray the dry shampoo from the top to the bottom of the hairpiece for 2 - 3 seconds and repeat on the back side of the hairpiece. Confirm that the distance between the actuator and the hairpiece is 6 inches. Support the back side of the hairpiece with the opposite hand to avoid the hair being blown away. Next, leave the hairpiece for 30 seconds and then brush the hairpiece from top to bottom (3 times per side). Next, create "brush lines" using a wide-tooth comb as described in the preparation of the negative control above.

[0067] In illumination at least equal to that of a standard 100-watt incandescent white bulb at 30 cm, observe, with the naked eye (except for standard corrective lenses adapted to compensate for myopia, hyperopia, or astigmatism, or other corrected vision), changes in the amount and brush lines, as well as changes in the sharpness and thickness of the brush lines. Compare one or more hairpieces treated with dry shampoo to the negative and positive controls.

[0068] Particle size distribution test method Measure the particle size distribution using a Malvern Spraytec device. Dv50 is a term that represents the maximum particle size diameter below which 50% of the sample volume lies and is also known as the volume median particle size. The Malvern Spraytec device uses laser diffraction technology for measuring the size of spray particles. The intensity of the light scattered when a laser beam passes through the droplets is measured. This data is then analyzed to calculate the size of the particles that generated the scattering pattern. Use the Malvern Spraytec 2000 according to the manufacturer's instructions. The test sample has a temperature of 20°C - 22°C.

[0069] Pressure test method The pressure test is carried out at 20 - 24°C. Shake the aerosol container and then operate the package for a short time (about 1 second) to ensure that not only the propellant but also the complete product is in the dip tube. If an actuator button or an actuator spray cap is placed on the aerosol valve, first remove the button or the spray cap. Measure and record the can pressure using a calibrated pressure gauge. The pressure read by the gauge can be recorded in 0.5 psi units.

[0070] Viscosity test method The viscosity is measured for the dry shampoo composition using a Brookfield DV2T Viscometer. Optionally, after degassing the can, measure the viscosity of the dry shampoo composition. This Brookfield viscometer determines the viscosity by measuring the force required to rotate a spindle in the solution at a given speed. At a product temperature of 20.5°C, a speed setting of 5 rpm, and a measurement time of 45 seconds, the spindle used is RV - 4. A minimum sample size of 250 mL is required.

[0071] Visible residue test method Wet a 5 g, 8 - inch long straight hairpiece for 15 seconds, shampoo it with Pantene® Nutrient Blends Pure Clean & Clarify Silicone - Free Shampoo (0.1 mL of shampoo per 1 g of hair), and hang it to air dry. Hang the hairpiece and let it dry overnight.

[0072] Once dry, set aside 3 hairpieces as positive controls and treat the remaining hairpieces with sebum as described in the oil absorption test method described herein.

[0073] Support the back side of the hairpiece with the opposite hand and spray dry shampoo from the top to the bottom of the hairpiece for 2 - 3 seconds while avoiding the hair from being blown away. Make sure the distance between the actuator and the hairpiece is 6 inches. Rub the dry shampoo into the hair using a circular motion with your thumb from the top to the bottom of the hairpiece. Then repeat on the other side. After treating both sides, brush the front side of the hairpiece 3 times and the back side 3 times. Static electricity is removed from all hairpieces via an electrostatic gun.

[0074] Observe the changes between the control hairpiece and the treated hairpiece. Observe the hairpiece with the naked eye (except for standard corrective lenses adapted to compensate for myopia, hyperopia, or emmetropia, or other corrected vision) under illumination at least equal to that of a standard 100 - watt incandescent white bulb at 60 cm. Compare one or more hairpieces treated with dry shampoo to the control.

Example

[0075] The following data and examples are provided to help illustrate the skincare compositions described herein. The compositions illustrated are provided for illustrative purposes only and should not be construed as limiting the disclosure since many variations are possible without departing from the spirit and scope of the disclosure. All parts, percentages, and ratios herein are by weight of the dry shampoo product (i.e., the dry shampoo composition and the propellant), unless otherwise specified.

[0076] Various dry shampoo compositions containing the contents of Table 1 and Table 2 were manufactured.

[0077] Examples 1 to 4 in Table 1 below are dry shampoo products containing ethanol or HMDS, oil-absorbing starch, trace components, fragrance, optionally silica, and a propellant. The oil-absorbing starch in these examples is modified tapioca starch and / or a combination of modified tapioca starch and unmodified tapioca starch. Other oil-absorbing starches used in dry shampoo (e.g., rice starch, corn starch, and / or potato starch) are considered to have similar oil-absorbing properties. The weight percentage of the propellant is determined when the dry shampoo product is in a full aerosol container. The total VOC% is calculated by adding the weight percentages of each VOC component (e.g., ethanol and / or propellant). The following tests were conducted for each example. · The drying time was determined by spraying the dry shampoo on a hair sample, waiting for about 10 seconds, and then feeling the hair sample to determine whether it was dry. · Oil absorption at the hair root according to the oil absorption test method described herein · Visible residue after application determined by the visible residue test method described herein · Pressure according to the pressure test method described herein. · Average particle size (Dv50) determined by the particle size distribution test method described herein · Spray rate determined by the delivery rate test method described herein

[0078]

Table 1

[0079] In Table 1, Example 1 is a current dry shampoo product containing a hydrocarbon propellant and ethanol, both of which are VOCs, and modified tapioca starch. Example 1 is known to have spray characteristics including drying time, oil absorption at the hair root, visible residue after application, and pressure, average particle size (Dv50), and spray rate preferred by consumers.

[0080] Example 2 is the same dry shampoo product as Example 1, except that part of the hydrocarbon propellant is replaced with HFC-152a (1,1-difluoroethane), which is an organoflurine (i.e., not a VOC). It was found that the drying time, oil absorption, and visible residue were almost equal to those of Example 1. The spraying characteristics, including pressure, average particle size, and spraying speed, were close to those measured for Example 1, and small variations would likely not be noticed by consumers. Example 2 has a total VOC content of 49.68%. However, HFC-152a may not be preferred by consumers and industrially.

[0081] Examples 3 and 4 are the same as Example 1, except that ethanol is removed and HMDS is added. Therefore, the total VOC% in the composition is 49.5%. In addition, both Examples 3 and 4 do not contain ethanol and water. The oil-absorbing starch in Example 3 is modified tapioca starch, similar to Examples 1 and 2. The oil-absorbing starch in Example 4 is a combination of modified tapioca starch and tapioca starch. It was found that the drying time and oil absorption of Examples 3 and 4 were the same as those of Example 1. In Examples 3 and 4, there was less visible white powder than in Example 1, which may be preferred by consumers. In one experiment, a hairpiece was treated with 0.005 g of sebum per gram of hair, washed with a non-conditioning shampoo (Pantene® Nutrient Blends Pure Clean & Clarify Silicone-Free Shampoo), and the other was treated with Example 3. Example 3 had the same residue as the non-conditioning shampoo, which is an excellent cleansing shampoo that generally leaves little residue. The spraying characteristics, including pressure, average particle size, and spraying speed, were close to those measured for Example 1, and small variations would likely not be noticed by consumers.

[0082] The results in Table 1 show that Examples 3 and 4, which do not contain ethanol and water, contain HMDS, and have a total VOC% of 50% or less, have spray characteristics and performance similar to those of Example 1, which contains ethanol and has a total VOC content of more than 90%. Consumers are likely to prefer the performance of Examples 3 and 4 just as much, if not more, than the performance of Example 1.

[0083] Table 2 shows examples of the prepared dry shampoo compositions containing HMDS and hectorite clay. In large batch formulations containing oil-absorbing starch, particularly modified tapioca starch, and HMDS, it was found that the tapioca starch settled before the aerosol container was filled. Hectorite clay can be added to the composition, which was able to help keep the starch in suspension and also act as an anti-caking agent. If too much clay was added, it was difficult to process the dry shampoo composition. However, if too little clay was added, the starch did not remain in suspension and settled. It was also found that adding triethyl citrate together with the hectorite clay can help promote the clay network and prevent aggregation and sedimentation.

[0084]

Table 2

[0085] Trade names and suppliers for Table 2 1. Bentone® 38 manufactured by Elementis® Global 2. Dry-Flo® TS Pure manufactured by Akzo Nobel®

[0086] The examples in Table 2 can be prepared using different propellants including, but not limited to, butane, isobutane, propane, or mixtures thereof.

[0087] Combination A. A dry shampoo product, a) a carrier comprising a volatile silicone having a viscosity of 1 cSt or less, preferably 0.65 cSt or less; b) oil-absorbing starch dispersed in the volatile silicone carrier; c) a propellant, and The dry shampoo product contains 55% by weight or less, preferably 50% by weight or less of volatile organic compounds of the dry shampoo product. B. The dry shampoo product according to paragraph A, wherein the volatile silicone is hexamethyldisiloxane. C. The dry shampoo product according to paragraph B, wherein hexamethyldisiloxane is present in more than 20% by weight, preferably ≥ 30% by weight, more preferably ≥ 35% by weight, still more preferably ≥ 40% by weight of the dry shampoo product. D. The dry shampoo product according to paragraphs B to C, wherein hexamethyldisiloxane is present in 20% to 60% by weight, preferably 25% to 55% by weight, more preferably 30% to 50% by weight, still more preferably 35% to 45% by weight, or 38% to 43% by weight of the dry shampoo product. E. The dry shampoo product according to paragraphs A to D, wherein the oil-absorbing starch comprises rice starch, corn starch, potato starch, tapioca starch, or a combination thereof. F. The dry shampoo product according to paragraphs A to E, wherein the oil-absorbing starch is present in 1% to 15% by weight, preferably 3% to 12% by weight, more preferably 6% to 10% by weight of the dry shampoo product. G. The dry shampoo product according to paragraphs A to F, wherein the propellant does not contain 1,1-difluoroethane. H. The dry shampoo product according to paragraphs A to H, wherein the product is formulated without water and ethanol. I. The dry shampoo product according to paragraphs A to I, wherein the product is formulated without polymers and surfactants. J. The dry shampoo product according to paragraphs A to J, further comprising a rheology modifier and / or a polar activator modifier or a polar activator. K. The dry shampoo product of paragraph J, wherein the rheology modifier and / or polar active agent improves the uniformity of the oil-absorbing starch suspended in the carrier compared to a dry shampoo product that does not contain a rheology modifier. L. The dry shampoo product of paragraphs J-K, wherein the rheology modifier comprises a water-swellable clay, and the water-swellable clay comprises laponite, ventolite, montmorillonite, smectite, hectorite, or combinations thereof. M. The dry shampoo product of paragraphs J-L, wherein the polar active agent comprises methanol, ethanol, acetone, propylene carbonate, water, triethyl citrate, propylene carbonate, or combinations thereof. N. The dry shampoo product of paragraphs J-M, wherein the rheology modifier and / or polar active agent is present in a total amount of 0.5% to 3%, preferably 0.75% to 2%, more preferably 1% to 1.75%, and even more preferably 1.25% to 1.5% rheology modifier by weight of the dry shampoo product. O. An aerosol hair care product comprising: a. an aerosol container comprising a pressurizable container and an actuator; b. the dry shampoo product of paragraphs A-N disposed within a pressurizable container; An aerosol hair care product, wherein the aerosol personal care product is pressurized to 45 psig to 80 psig, preferably 50 psig to 75 psig, more preferably 55 psig to 70 psig according to a pressure test method. P. The aerosol hair care product of paragraph O, wherein the dry shampoo composition provides a dry feel within 10 seconds of being dispensed from the container. Q. A method for cleansing or refreshing hair, comprising: a. providing an aerosol hair product as described in paragraphs O-P; b. Depressing the nozzle, thereby releasing the dry shampoo product as an aerosol spray; c. applying the dry shampoo composition to the user's hair. According to the delivery speed test method, the oil-absorbing starch of 0.025 g to 0.2 g per second, preferably 0.05 g / s to 0.15 g / s, more preferably 0.06 g / s to 0.1 g / s, still more preferably 0.07 g / s to 0.08 g / s, is applied to the hair by the method described in paragraph Q. S. The method described in paragraphs Q - R, wherein the aerosol spray has an average particle size (Dv50) of 5 μm to 250 μm, preferably 10 μm to 225 μm, according to the particle size distribution test method. T. Use in a dry shampoo product as defined in paragraphs A - N of a carrier comprising a volatile silicone having a viscosity of 1 cst or less, preferably 0.65 cst or less, for providing a dry shampoo composition having 55% or less volatile organic compounds, preferably 50% or less volatile organic compounds. U. Use in a dry shampoo product as defined in paragraphs A - N of a carrier comprising a volatile silicone having a viscosity of 1 cst or less, preferably 0.65 cst or less, for delivering a dry shampoo that dries in about 10 seconds or less, absorbs oil, and / or has few visible residues after application.

[0088] The dimensions and values disclosed herein should not be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise indicated, each such dimension is intended to mean both the recited value and the functionally equivalent range surrounding that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm".

[0089] All documents cited herein, including any patents or patent applications that are cross-referenced or related, and any patent applications or patents for which this application claims priority or the benefit thereof, are hereby incorporated by reference in their entirety, unless expressly excluded or limited. The citation of any document shall not be construed as an admission that such document is prior art with respect to any invention disclosed or claimed herein, nor shall it be construed as teaching, suggesting, or disclosing any such invention, either alone or in combination with any other one or more references. Further, in the event of any conflict between any meaning or definition of a term in this document and any meaning or definition of the same term in a document incorporated by reference, the meaning or definition given to the term in this document shall prevail.

[0090] Although specific embodiments of the invention have been illustrated and described, it will be apparent to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. Accordingly, all such changes and modifications that fall within the scope of the invention are intended to be covered by the appended claims.

Claims

1. A dry shampoo product comprising: a) a carrier comprising a volatile silicone having a viscosity of 1 cSt or less, preferably 0.65 cSt or less, according to the viscosity test method described herein; and b) oil-absorbing starch dispersed in the volatile silicone carrier; and c) a propellant, wherein the dry shampoo product contains 55% by weight or less, preferably 50% by weight or less, of volatile organic compounds of the dry shampoo product.

2. The dry shampoo product according to claim 1, wherein the volatile silicone is hexamethyldisiloxane.

3. The dry shampoo product according to claim 2, wherein the hexamethyldisiloxane is present in more than 20% by weight, preferably more than 30% by weight, more preferably more than 40% by weight, and even more preferably more than 40% by weight of the dry shampoo product.

4. The dry shampoo product according to any one of claims 1 to 3, wherein the oil-absorbing starch is selected from rice starch, corn starch, potato starch, tapioca starch, or a mixture thereof.

5. The dry shampoo product according to any one of claims 1 to 4, wherein the oil-absorbing starch is present in 3% to 12% by weight, preferably 3% to 12% by weight, more preferably 6% to 10% by weight of the dry shampoo product.

6. The dry shampoo product according to any one of claims 1 to 5, wherein the propellant does not contain 1,1-difluoroethane.

7. The dry shampoo product according to any one of claims 1 to 6, wherein the product is formulated without water and ethanol.

8. The dry shampoo product according to any one of claims 1 to 7, wherein the product is formulated without polymers and surfactants.

9. The dry shampoo product according to any one of claims 1 to 8, further comprising a rheology modifier and / or a polar activator modifier or a polar activator.

10. The dry shampoo product according to claim 9, wherein the rheology modifier comprises water-swellable clay, and the water-swellable clay is selected from laponite, bentonite, montmorillonite, smectite, hectorite, or a mixture thereof.

11. The dry shampoo product according to claim 9, wherein the polar activator is selected from methanol, ethanol, acetone, propylene carbonate, water, triethyl citrate, propylene carbonate, or a mixture thereof.

12. The dry shampoo product according to claims 9 to 11, wherein the rheology modifier and / or the polar activator are present in a total amount of 0.5% to 3% by weight, preferably 0.75% to 2% by weight, more preferably 1% to 1.75% by weight, and even more preferably 1.25% to 1.5% by weight of the dry shampoo product.

13. An aerosol hair care product, a. An aerosol container including a pressurizable container and an actuator, b. The dry shampoo product according to any one of claims 1 to 12 disposed within the pressurizable container, The aerosol hair care product, wherein the aerosol personal care product is pressurized to 45 psig to 80 psig, preferably 50 psig to 75 psig, more preferably 55 psig to 70 psig according to a pressure test method.

14. The aerosol hair care product according to claim 13, wherein the dry shampoo composition provides a dry feel within 10 seconds after being dispensed from the container.

15. Use of a carrier comprising a volatile silicone having a viscosity of 1 cst or less, preferably 0.65 cst or less, for providing a dry shampoo composition having 55% or less volatile organic compounds, preferably 50% or less volatile organic compounds, in the dry shampoo product according to any one of claims 1 to 14.

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