Dry shampoo product with less than 55% of volatile organic compounds

Abstract

A dry cleaning shampoo product, which can comprise: a carrier comprising a volatile silicone having a viscosity of 1 cst or less; the oil absorption starch is dispersed in the volatile organic silicon carrier; and a propellant. The dry-cleaning shampoo product can have less than 55% of volatile organic compounds by weight of the dry-cleaning shampoo product while also providing acceptable product performance.

Description

Technical Field

[0001] The invention discloses a dry shampoo product, which comprises oil-absorbing starch and a propellant dispersed in a carrier, and is particularly an aerosol dry shampoo product with a volatile organic compound content of less than 55%. Background Art

[0002] Many consumers use dry shampoos that do not require water to reduce oil and dirt in their hair and on their scalp between washes. Consumers want dry shampoos that dry quickly, are easy to apply, and leave their hair looking and feeling less greasy and without residue.

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

[0004] Therefore, there is a need for a dry shampoo product that has less than 50% VOC and dries quickly, effectively reduces oil on the user's hair and scalp, and does not leave a noticeable residue. Summary of the invention

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

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

[0007] Dry shampoo products are spray-on hair products that reduce the appearance of oil and dirt on the user's hair and / or scalp. Unlike traditional shampoos and conditioners, dry shampoo can be applied to dry hair and does not need to be rinsed off. It is often used to refresh the hair between washes.

[0008] Typical dry shampoo products contain between 80% and 90% VOC content. Ethanol (a VOC) is usually used as the bulk phase, and it helps suspend the oil-absorbing particles and deliver them to the user's hair and scalp, and draws moisture and oil from the user's hair and scalp, while also drying quickly. The propellant is usually a hydrocarbon (another VOC), which acts as a solvent in the aerosol package, and when the actuation button is pressed, the valve opens, and because the pressure outside the can is less than the pressure inside the can, the propellant expands, pushing the product up the dip tube and out through the valve in the form of a fine mist.

[0009] There is pressure from both regulators and consumers to reduce the VOC concentration in dry shampoo products to below 55% and preferably below 50%. This requires reformulation to remove some or all of the ethanol carrier and / or hydrocarbon VOC propellant.

[0010] Some products can replace hydrocarbon propellants with HFC-152a propellant (1,1-difluoroethane), which is a liquefied gas propellant that is not a VOC and is known to have similar propellant properties to hydrocarbon VOC propellants. However, there is pressure from some regulatory agencies and consumers to avoid the use of this propellant, so it is not a preferred solution for the dry shampoo products described herein.

[0011] Removing and replacing ethanol is challenging because ethanol is key to providing important performance attributes to dry shampoo formulations. These performance attributes include the following:

[0012] Rapid evaporation for quick drying / no wet hair feeling

[0013] Dissolves scalp oils for a clean-looking dry shampoo benefit

[0014] No odor

[0015] Low viscosity

[0016] Low surface tension

[0017] Compatible with most surfaces

[0018] It has been found that the use of 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 dry shampoo products can result in products with consumer acceptable performance that also have a VOC of 55% or less, preferably 50% or less. Dry shampoo products with an HMDS carrier can deliver conditioning and / or smoothing and / or frizz reduction benefits to the user's hair. Another benefit of HMDS is that when applied to the hair, the spray feels like it is at room temperature, whereas traditional ethanol-based dry shampoos feel cool as they are dispensed. Viscosity can be determined according to the Viscosity Test Method described herein.

[0019] Interestingly, HMDS is sometimes used as a trace ingredient at low levels (i.e., well below 20%) in hair care formulations, including alcohol and water-based hair styling products. However, surprisingly, HMDS, a silicone material that some users find makes their hair feel heavy and greasy, performs well as a carrier for dry shampoo aerosol sprays. The main benefit of dry shampoo products is to absorb hair oils and reduce the appearance of oily roots, so adding a silicone oil carrier for this purpose is not intuitive.

[0020] The dry shampoo product (i.e., dry shampoo composition and propellant) can contain ≥20%, alternatively ≥25%, alternatively ≥30%, alternatively ≥35%, and alternatively ≥40% HMDS. The dry shampoo product can contain from about 20% to about 60%, alternatively from about 25% to about 55%, alternatively from about 30% to about 50%, alternatively from about 35% to about 45%, and alternatively from about 38% to about 43% HMDS.

[0021] The dry shampoo composition can be formulated without, substantially free of, or free of ethanol, water, surfactants, parabens, propellant 152a (1,1-difluoroethane), and / or polymers including, but not limited to, film-forming polymers.

[0022] The ejected composition can contain particles having an average particle size distribution (Dv50) of about 5 μm to about 250 μm, and alternatively 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 can be used to provide an optimal drying time on the hair because the particles of the ejected composition are well distributed throughout the head hair, and there is also enough oil-absorbing starch in each particle (droplet) to provide sufficient oil absorption on the hair and scalp.

[0023] The spray rate of the composition ejected can be from about 0.4 g / s to about 0.9 g / s, alternatively from about 0.45 g / s to about 0.75 g / s, alternatively from about 0.5 g / s to about 0.7 g / s, alternatively from about 0.55 g / s to about 0.7 g / s, and alternatively from about 0.57 g / s to about 0.65 g / s. The spray rate can be measured by the delivery rate test method described herein.

[0024] The ejected composition can deliver about 0.025 g / s to about 0.2 g / s, alternatively about 0.05 g / s to about 0.15 g / s, alternatively about 0.06 g / s to about 0.1 g / s, alternatively about 0.07 g / s to about 0.08 g / s, and alternatively about 0.075 g / s of oil-absorbing starch. The amount of oil-absorbing starch can be determined according to the delivery rate test method described herein.

[0025] The pressure in the aerosol container can be greater than 50 psig. According to the pressure test method described herein, the pressure in the aerosol container can be about 40 psig to about 85 psig, alternatively about 45 psig to about 80 psig, alternatively about 50 psig to about 75 psig, and alternatively about 55 psig to about 70 psig.

[0026] The dry shampoo composition can have a viscosity of ≥800 cP, alternatively ≥1250 cP, alternatively ≥3000 cP, and alternatively ≥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.

[0027] The dry shampoo composition can feel dry within 10 seconds, alternatively within 7 seconds, and alternatively within 5 seconds of application to the hair.

[0028] In some examples, the dry shampoo product and / or dry shampoo composition may have a limited number of ingredients, particularly a limited number of ingredients that need to be reported in an INCI (International Nomenclature of Cosmetic Ingredients) statement on the package. The composition can have ≤25 ingredients, alternatively ≤20 ingredients, alternatively ≤15 ingredients, alternatively ≤12 ingredients, alternatively ≤10 ingredients, and alternatively ≤8 ingredients.

[0029] Unless otherwise specifically stated, all percentages are by weight of the cosmetic composition. Unless otherwise specifically stated, all ratios are by weight. All ranges are inclusive and combinable. The number of significant figures expresses neither a limitation on the amount shown nor a limitation on the accuracy of the measurement. All numerical values ​​should be understood to be modified by the word "about" unless otherwise specifically stated. Unless otherwise specified, all measurements are understood to be made at approximately 21°C and ambient conditions, where "ambient conditions" means conditions at about 1 atmosphere and about 50% relative humidity. All numerical ranges are narrower ranges including the end values; the upper and lower limits of the ranges described are interchangeable to further form ranges that are not explicitly described.

[0030] definition

[0031] As used herein, "formulated to be free of" means that the ingredient is not intentionally added. However, "formulated to be free of" does not guarantee "100% free of" because trace amounts of contaminants are possible.

[0032] As used herein, "hair" means mammalian hair, including scalp hair, facial hair, and body hair, especially hair on the human head and scalp.

[0033] As used herein, "volatile" means those substances that are liquid under ambient conditions and have a measurable vapor pressure at 25° C. Specifically, the substance 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.

[0034] Unless otherwise specifically stated, all percentages are by weight of the cosmetic composition. Unless otherwise specifically stated, all ratios are by weight. All ranges are inclusive and combinable. The number of significant figures expresses neither a limitation on the amount shown nor a limitation on the accuracy of the measurement. All numerical values ​​should be understood to be modified by the word "about" unless otherwise specifically stated. Unless otherwise specified, all measurements are understood to be made at approximately 25°C and ambient conditions, where "ambient conditions" means conditions at about 1 atmosphere and about 50% relative humidity. All numerical ranges are narrower ranges including the end values; the upper and lower limits of the ranges described are interchangeable to further form ranges that are not explicitly described.

[0035] Dry shampoo composition

[0036] The dry shampoo composition can contain an HMDS carrier and an oil absorbing starch.The dry shampoo composition may also contain optional ingredients including rheology modifiers, polar activators, fragrances, and other minor ingredients.

[0037] The conditioner composition can have a pH of from about 3 to about 9, and alternatively from 4 to about 6.

[0038] Oil-absorbing starch

[0039] The dry shampoo product (i.e., dry shampoo composition and propellant) can contain from about 1% to about 15%, alternatively from about 3% to about 12%, and alternatively from about 6% to about 10% of an oil absorbing starch by weight of the dry shampoo product. The oil absorbing starch can be dispersed in a carrier.

[0040] Non-limiting examples of oil-absorbing starches suitable for dry shampoo can include rice starch, corn starch (also known as corn flour), potato starch, silica, clay, and / or tapioca starch. Additional starches suitable for use in the present invention US Publication No. 2016 / 0317396, which is incorporated by reference.

[0041] In some examples, the oil absorbing starch can be granular tapioca starch. The granular tapioca starch can be selected from the group consisting of hydrophobically modified granular tapioca starch, hydrophobically unmodified granular tapioca starch, and combinations thereof. The ratio of hydrophobically modified granular tapioca starch to unmodified granular tapioca starch can be 2:1 or greater.

[0042] Hydrophobically modified granular tapioca starch can be prepared by a variety of methods, including those discussed in U.S. Pat. Nos. 7,375,214, 7,799,909, 6,037,466, 2,852,404, 5,672,699, and 5,776,476.

[0043] The modified cassava granular starch may be an organically modified cassava starch or a silicone-grafted granular cassava starch. Silicone-grafted granular cassava starch is commercially available under the trade name Dry Flo TS and under the INCI name Tapioca starch polymethylsilsesquioxane. Silicone-modified granular cassava starch can be prepared by the reaction of sodium methylsiliconate (polymethylsilsesquioxane) and cassava starch. Granular cassava starch can be derived from cassava roots by standard methods known in the art. An example of a commercially available silicone-modified granular cassava starch is CAS number 68989-12-8.

[0044] Rheology Modifiers

[0045] 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%, alternatively from about 0.75% to about 2%, alternatively from about 1% to 1.75%, and alternatively from about 1.25% to about 1.5% of a rheology modifier.

[0046] The dry shampoo composition can include a rheology modifier which can be a water-swellable clay, non-limiting examples of which include laponite, bentonite, montmorillonite, smectite, and hectorite.

[0047] The rheology modifier can be an alginic acid based material; non-limiting examples can include sodium alginate and propylene glycol alginate.

[0048] The rheology modifier may be a homopolymer based on acrylic acid, methacrylic acid or other related derivatives, non-limiting examples can include polyacrylate, polymethacrylate, polyethyl acrylate and polyacrylamide.

[0049] The rheology modifier may be a cross-linked acrylic polymer, non-limiting examples of which can include carbomer.

[0050] The rheology modifier can be an associative polymer thickener, non-limiting examples of which can include: hydrophobically modified cellulose derivatives; hydrophobically modified alkoxylated urethane polymers, non-limiting examples of which include PEG-150 / decyl alcohol / SMDI copolymer, PEG-150 / stearyl alcohol / SMDI copolymer, polyurethane-39; hydrophobically modified alkali swellable emulsions, non-limiting examples of which include hydrophobically modified polyacrylates, hydrophobically modified polyacrylic acids, and hydrophobically modified polyacrylamides; hydrophobically modified polyethers, wherein these materials may have a hydrophobe that can be selected from cetyl, stearyl, oleyl, and combinations thereof, and a hydrophilic portion having 10 to 300, in another embodiment 30 to 200, and in another embodiment 40 to 150 repeating units of repeating ethylene oxide groups. Non-limiting examples of this type include PEG-120-methylglucose dioleate, PEG-(40 or 60) sorbitan tetraoleate, PEG-150 pentaerythritol tetrastearate, PEG-55 propylene glycol oleate, PEG-150 distearate.

[0051] The rheology modifier can be cellulose and derivatives; non-limiting examples can include microcrystalline cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, ethyl cellulose, nitrocellulose, cellulose sulfate, cellulose powder, and hydrophobically modified cellulose.

[0052] The rheology modifier may be guar gum and guar gum derivatives; non-limiting examples include hydroxypropyl guar and hydroxypropyl guar hydroxypropyltrimonium chloride.

[0053] The rheology modifier may be dibenzylidene sorbitol, carrageenan, pectin, agar, quince seeds (Cydonia oblonga seeds), starch derivatives (eg carboxymethyl starch, methylhydroxypropyl starch), algae extracts, dextran, succinoglucan and pulleran.

[0054] The rheology modifier may be polyethylene oxide, polypropylene oxide, and POE-PPO copolymer.

[0055] The rheology modifier may be polyvinyl pyrrolidone, cross-linked polyvinyl pyrrolidone, and derivatives. In another embodiment, the rheology modifier may be polyvinyl alcohol and derivatives.

[0056] Rheology modifiers may be polyethyleneimine and derivatives.

[0057] The rheology modifier may be silica; non-limiting examples include fumed silica, precipitated silica, and silicone surface treated silica.

[0058] Additional rheology modifiers that may be used are disclosed in US Pat. No. 11129780, which is incorporated by reference.

[0059] Polar Activator

[0060] In some examples, the dry shampoo composition can include one or more polar activators. The dry shampoo product (i.e., the dry shampoo composition and the propellant) can include from about 0.1% to about 1%, alternatively from about 0.2% to about 0.8%, alternatively from about 0.3% to 0.7%, and alternatively from about 0.4% to about 0.6% of the polar activator.

[0061] Non-limiting examples of polar activators can include methanol, ethanol, acetone, propylene carbonate, water, triethyl citrate, propylene carbonate, or combinations thereof.

[0062] When a rheology modifier and / or a polar activator is included in the formulation, the dry shampoo product can have better homogeneity of the oil-absorbing starch suspended in the carrier compared to a dry shampoo product that does not include a rheology modifier.

[0063] Optional Ingredients

[0064] The dry shampoo compositions described herein may also contain any other suitable optional ingredients as desired. For example, the hair care composition can contain other active or inactive ingredients.

[0065] Dry shampoo compositions can contain natural oils, such as olive oil, argan oil, jojoba oil, passion fruit oil.

[0066] Dry shampoo compositions can contain scalp health actives to provide scalp benefits. This group of materials is varied and provides a wide range of benefits, including anti-dandruff, anti-fungal, anti-microbial, moisture retention, barrier improvement, and antioxidants, anti-itching agents, and sensates. Such health actives include, but are not limited to: zinc pyrithione, climbazole, oxymetholone, vitamins E and F, salicylic acid, glycols, glycolic acid, PCA, PEG, erythritol, glycerol, lactates, hyaluronates, allantoin and other ureas, betaines, sorbitol, glutamate, xylitol, menthol, menthyl lactate, ambroxol, benzyl alcohol, and natural extracts / oils (including peppermint, spearmint, argan oil, jojoba oil, and aloe). The composition can contain other commonly used hair ingredients.

[0067] The CTFA Cosmetic Ingredient Handbook, Tenth Edition (published by the Cosmetic, Toiletry, and Fragrance Association, Inc. (Washington, DC)) (2004) (hereinafter referred to as "CTFA") describes a wide variety of non-limiting materials that can be added to the compositions herein. Examples of these ingredient categories include, but are not limited to, aesthetic components such as fragrances, pigments, colorants / pigments, essential oils, sensates, defoamers, antimicrobial agents, biological additives, buffers, bulking agents, chelating agents, chemical additives, astringents, biocides, film formers or materials, pH adjusters, reducing agents, sequestrants, and surfactants.

[0068] Compressed propellant

[0069] The dry shampoo products described herein (i.e., the dry shampoo composition and the propellant) can contain from about 15% to about 85%, alternatively from about 20% to about 80%, alternatively from about 30% to about 70%, alternatively from about 40% to about 65%, alternatively from about 49% to about 55%, by weight of the dry shampoo product (i.e., the dry shampoo composition and the propellant).

[0070] The propellant can contain one or more volatile materials that are in a gaseous state and can carry other components of the dry shampoo composition in particulate or droplet form. The propellant can have a boiling point in the range of about -45°C to about 5°C. The propellant can be liquefied when packaged under pressure in a conventional aerosol container. Rapid boiling of the propellant when leaving the aerosol foam dispenser can aid in the atomization of other components in the dry shampoo product.

[0071] Aerosol propellants that can be used in dry shampoo products can 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. Propellants can include hydrocarbons such as isobutane, propane, and butane, which can be used for their low ozone reactivity and can be used as separate components, wherein their vapor pressure at 21.1° C. is in the range of about 1.17 bar to about 7.45 bar, alternatively about 1.17 bar to about 4.83 bar, and alternatively about 2.14 bar to about 3.79 bar.

[0072] How to use

[0073] Dry shampoo products can be used to clean and / or refresh hair in less than 60 seconds. Dry shampoo products can have no obvious residue and can remove excess oil from any type of hair. Dry shampoo products can be sprayed on dry or moist hair. The spray should be kept at about 8 inches to about 12 inches away from the place where the spray is intended to land. Dry shampoo can be sprayed on any part of the hair from the root to the tip of the hair. In some examples, dry shampoo can be sprayed on the root and massaged into the root. In other examples, dry shampoo can be sprayed on the hair and combed evenly. Dry shampoo is not rinsed off.

[0074] Package

[0075] Aerosol hair care products can include an aerosol dispenser having a pressurizable outer container that can be used for such dispensers. The outer container can include plastic or metal. The outer container can have an opening. When the pressurizable container is in its in-use position, the opening is typically located at the top of the pressurizable container. The opening defines a neck to which other components can be sealed.

[0076] The valve seat can be sealed to the opening of the outer container. The valve assembly can then be arranged in the valve seat. The valve assembly provides the retention of the dry shampoo product (dry shampoo composition and propellant) in the aerosol dispenser until the dry shampoo product is selectively dispensed by the user. The valve assembly can be selectively actuated by an actuator. The selective actuation of the valve assembly allows the user to dispense the desired amount of dry shampoo composition as needed. Additional details and examples about the aerosol dispenser can be found in US 9505509, which is incorporated by reference (see, for example, FIG. 2B of an aerosol dispenser with a dip tube and the accompanying text).

[0077] Test Method

[0078] Delivery Rate Test Method

[0079] The delivery rate of the aerosol hair spray products herein 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 loss over a given period of time. This is related to the amount of material discharged through the valve and actuator combination over a given period of time. In this case, the can is tested at room temperature (at 21° C.) and an actuation duration of 2 seconds to 10 seconds. The delivery rate (also called spray rate) is then determined by the following formula:

[0080] Delivery rate (g / s) = mass loss (g) / actuation time (s)

[0081] The delivery rate of oil-absorbing starch was determined by the following formula:

[0082] Delivery rate of oil-absorbing starch (g / s) = delivery rate (g / s) x percentage of oil-absorbing starch in dry shampoo product (%)

[0083] Oil absorption test method

[0084] use 5 g, 8" long straight hair switches were washed with Nutrient Blends Pure Clean & Clarify Silicone-Free Shampoo and hung to air dry. At least one switch was used for each dry conditioner composition tested, at least one switch was a negative control, and at least one positive control. The positive control was a clean, untreated switch.

[0085] Weigh 0.05g of artificial sebum per gram of hair. While wearing gloves, apply the artificial sebum to the fingertips and rub the fingertips together with both hands to melt the sebum. Apply the sebum to the front and back of the hanging hair cluster in a downward motion, then squeeze it into the hair (alternating hands) for 10 to 15 seconds. Place the sebum-treated hair cluster between two foils. Blow-dry the front and back of the hair cluster for 30 seconds on each side. This will ensure that the sebum is evenly distributed throughout the hair cluster. Hang the hair cluster.

[0086] Create at least one negative control by passing a wide-tooth comb through one of the hair switches, ensuring that the hair is evenly distributed between the teeth of the comb. Slowly move the comb down the hair sample once to create a brush line.

[0087] Repeat the above steps for the hair switch to be treated with dry shampoo. Spray the dry shampoo from the top to the bottom of the hair switch in 2 to 3 seconds, and repeat this operation on the back of the hair switch. Make sure to maintain 6 inches between the actuator and the hair switch. Support the back of the hair switch with your other hand to avoid blowing the hair away. Then, let the hair switch sit for 30 seconds, and then brush the hair switch from top to bottom (3 times on each side). Next, use a wide-tooth comb to form a "brush line" as described above in forming a negative control.

[0088] Changes in volume and brush line, as well as changes in brush line definition and thickness, are observed with the unaided eye (except for standard corrective lenses appropriate to compensate for myopia, hyperopia, or emmetropia or other vision correction) under lighting at least equal to the illuminance of a standard 100 watt white incandescent light bulb at 30 cm. One or more hair switches treated with dry shampoo are compared to a negative control and a positive control.

[0089] Particle size distribution test method

[0090] A Malvern Spraytec instrument was used to measure the particle size distribution. Dv50 is a term that describes the maximum particle diameter that 50% of the sample volume has, also known as the median particle size by volume. The Malvern Spraytec instrument uses a laser diffraction technique to measure the size of the spray particles. The intensity of the light scattered when a laser beam passes through the spray is measured. The data is then analyzed to calculate the size of the particles that form the scattered pattern. A Malvern Spraytec 2000 was used according to the manufacturer's instructions. The test samples had a temperature between 20°C and 22°C.

[0091] Stress Testing Methods

[0092] The pressure test is performed at 20°C to 24°C. Shake the aerosol container and then briefly actuate the package (about 1 second) to ensure that all of the product is in the dip tube, not just the propellant. If an actuation button or actuator spray cap has been placed on the aerosol valve, remove the button or spray cap first. Measure and record the can pressure using a calibrated pressure gauge. The pressure read by the pressure gauge can be recorded to the nearest 0.5psi.

[0093] Viscosity test method

[0094] The viscosity of the dry shampoo composition was measured using a Brookfield DV2T viscometer. In some cases, the can was degassed and the viscosity of the dry shampoo composition was then measured. The Brookfield viscometer measures viscosity by measuring the force of rotating a spindle in a solution at a given rate. The spindle used was an RV-4, the product temperature was 20.5 degrees Celsius, the speed was set at 5 rpm, and the measurement time was 45 seconds. The minimum sample size required was 250 mL.

[0095] Visible Residue Test Method

[0096] Wet 5g, 8-inch long straight hair switches for 15 seconds and Hair was shampooed with Nutrient Blends PureClean & Clarify Silicone-Free Shampoo (0.1 ml shampoo per 1 g of hair) and hung to air dry. The hair switches were hung and dried overnight.

[0097] After drying, 3 hair switches were left as positive controls and the remaining hair switches were treated with sebum as described in the "Oil Absorption Test Method" described herein.

[0098] Spray the dry shampoo from the top to the bottom of the switch in 2 to 3 seconds while supporting the back of the switch with your other hand to avoid blowing the hair away. Make sure to maintain 6 inches between the actuator and the switch. Use your thumb to massage the dry shampoo into the hair using circular motions from the top to the bottom of the switch. Then, repeat this on the other side. After both sides have been treated, brush 3 times on the front of the switch and 3 times on the back of the switch. Remove any static from all switches via the static gun.

[0099] Observe the changes between the control hair switches and the treated hair switches. Observe the hair switches with the unaided eye (except for standard corrective lenses suitable for compensating for myopia, hyperopia or emmetropia or other vision correction) under lighting at least equal to the illumination of a standard 100 watt white incandescent light bulb at 60 cm. Compare one or more hair switches treated with the dry shampoo to the control.

[0100] Example

[0101] The following data and examples are provided to help illustrate the skin care compositions described herein. The exemplified compositions are given for illustrative purposes only and should not be construed as limitations of the present disclosure, as many variations are possible without departing from the spirit and scope of the present disclosure. Unless otherwise indicated, all parts, percentages and ratios herein are by weight of the dry shampoo product (i.e., dry shampoo composition and propellant).

[0102] Various dry shampoo compositions containing the contents of Table 1 and Table 2 were prepared.

[0103] Examples 1 to 4 in Table 1 below are dry shampoo products comprising ethanol or HMDS, oil-absorbing starch, trace components, fragrances, optional silica, and propellants. The oil-absorbing starch in these examples is a combination of modified tapioca starch and / or modified tapioca starch and unmodified tapioca starch. It is believed that other oil-absorbing starches (e.g., rice starch, corn starch, and / or potato starch) used in dry shampoo have similar oil absorption properties. The weight % of 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 the various VOC ingredients (e.g., ethanol and / or propellant). The following tests were performed on each example:

[0104] • Drying time was determined by spraying a hair sample with dry shampoo, waiting approximately 10 seconds, and then touching the hair sample to determine if it felt dry.

[0105] Oil absorption at the hair root, as measured by the oil absorption test method described in this article

[0106] Visible residue after application, as determined by the Visible Residue Test Method described herein

[0107] Pressure, tested according to the pressure test method described in this article.

[0108] Average particle size (Dv50), determined by the particle size distribution test method described herein

[0109] Spray rate, as determined by the Delivery Rate Test Method described herein

[0110] Table 1

[0111]

[0112]

[0113] In Table 1, Example 1 is a current dry shampoo product with hydrocarbon propellants and ethanol (both VOCs) and modified tapioca starch. Example 1 is known to have consumer preferred drying time, oil pick-up at the root of the hair, visible residue after application, and spray characteristics including pressure, average particle size (Dv50), and spray rate.

[0114] Example 2 is a dry shampoo product similar to Example 1, except that a portion of the hydrocarbon propellant is replaced with HFC-152a (1,1-difluoroethane), which is an organic fluorine, i.e., not a VOC. Drying time, oil absorption, and visible residue were found to be approximately equivalent to those of Example 1. Spray characteristics including pressure, average particle size, and spray rate were close to those measured for Example 1, and it is believed that small changes will 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 the industry.

[0115] Examples 3 and 4 are similar to Example 1, except that ethanol is removed and HMDS is added. Therefore, the total % VOC in the composition is 49.5%. In addition, Examples 3 and 4 do not contain ethanol and water. Similar to Examples 1 and 2, the oil absorbing starch in Example 3 is a modified tapioca starch. The oil absorbing starch in Example 4 is a combination of modified tapioca starch and tapioca starch. The drying time and oil absorption of Examples 3 and 4 were found to be similar to Example 1. Compared to Example 1, there is less visible white powder in Examples 3 and 4, which may be preferred by consumers. In one experiment, hair switches were treated with 0.005 g sebum / g hair and treated with a non-conditioning shampoo ( One switch was washed with Nutrient Blends Pure Clean & Clarify Silicone-Free Shampoo, and another was treated with Example 3, which had the same residue as a non-conditioning shampoo (which is generally an excellent cleansing shampoo that leaves little residue). The spray characteristics including pressure, average particle size, and spray rate were close to those measured for Example 1, and it is believed that the small changes will not be noticed by the consumer.

[0116] The results in Table 1 show that Examples 3 and 4, which are free of ethanol and water, contain HMDS, and have a total VOC% of less than or equal to 50%, have similar spray characteristics and performance to Example 1, which contains ethanol and has a total VOC content of greater than 90%. It is believed that consumers will like the performance of Examples 3 and 4 as much as (or even more than) that of Example 1.

[0117] Table 2 shows an example of a dry shampoo composition prepared comprising HMDS and hectorite clay. It was found that in a bulk formulation comprising an oil-absorbing starch (particularly modified tapioca starch) and HMDS, the tapioca starch would settle before the aerosol container was filled. Hectorite clay can be added to the composition, which can help keep the starch suspended and can also act as an anti-caking agent. If too much clay is added, it will be difficult to process the dry shampoo composition. However, if too little clay is added, the starch will not be suspended and will settle out. It was also found that adding triethyl citrate with the hectorite clay can help promote the clay network and prevent agglomeration and sedimentation.

[0118] Table 2

[0119]

[0120] Table 2 Product names and suppliers

[0121] 1. 38, from Global

[0122] 2. TS Pure, from

[0123] The examples in Table 2 can be made with different propellants including but not limited to butane, isobutane, propane or mixtures thereof.

[0124] combination

[0125] A. A dry shampoo product, comprising:

[0126] a) a carrier comprising a volatile silicone having a viscosity of 1 cst or less, preferably 0.65 cst or less;

[0127] b) oil-absorbing starch, wherein the oil-absorbing starch is dispersed in the volatile organosilicon carrier;

[0128] c) propellant;

[0129] The dry shampoo product comprises less than 55%, preferably less than 50% volatile organic compounds by weight of the dry shampoo product.

[0130] B. The dry shampoo product according to paragraph A, wherein the volatile silicone is hexamethyldisiloxane.

[0131] C. A dry shampoo product according to paragraph B, wherein the hexamethyldisiloxane is present at greater than 20%, preferably ≥30%, more preferably ≥35%, and even more preferably ≥40% by weight of the dry shampoo product.

[0132] D. A dry shampoo product according to paragraphs B to C, wherein the hexamethyldisiloxane is present at 20% to 60%, preferably 25% to 55%, more preferably 30% to 50%, and even more preferably 35% to 45%, and alternatively 38% to 43% by weight of the dry shampoo product.

[0133] 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.

[0134] F. A dry shampoo product according to paragraphs A to E, wherein the oil absorbing starch is present at 1% to 15%, preferably 3% to 12%, and more preferably 6% to 10% by weight of the dry shampoo product.

[0135] G. The dry shampoo product of paragraphs A to F, wherein the propellant does not contain 1,1-difluoroethane.

[0136] H. The dry shampoo product of paragraphs A to H, wherein the product is formulated to be free of water and ethanol.

[0137] I. The dry shampoo product according to paragraphs A to I, wherein the product is formulated to be free of polymers and surfactants.

[0138] J. A dry shampoo product according to paragraphs A to J, further comprising a rheology modifier and / or a polar activator modifier or polar activator.

[0139] K. A dry shampoo product according to paragraph J, wherein the rheology modifier and / or the polar activator improves the homogeneity of the oil-absorbing starch suspended in the carrier compared to a dry shampoo product not comprising a rheology modifier.

[0140] L. A dry shampoo product according to paragraphs J to K, wherein the rheology modifier comprises a water-swellable clay; wherein the water-swellable clay comprises a synthetic hectorite, a bentonite, a montmorillonite, a smectite, a hectorite, or a combination thereof.

[0141] M. The dry shampoo product of paragraphs J to L, wherein the polar activator comprises methanol, ethanol, acetone, propylene carbonate, water, triethyl citrate, propylene carbonate, or a combination thereof.

[0142] N. A dry shampoo product according to paragraphs J to M, wherein the rheology modifier and / or the polar activator is present in a combined amount of 0.5% to 3% rheology modifier, preferably 0.75% to 2%, more preferably 1% to 1.75%, and even more preferably 1.25% to 1.5%, by weight of the dry shampoo product.

[0143] O. An aerosol hair care product, comprising:

[0144] a. an aerosol container, the aerosol container comprising a pressurizable container and an actuator; and

[0145] b. A dry shampoo product according to paragraphs A to N, wherein the dry shampoo product is provided in a pressurizable container;

[0146] According to the pressure test method, the aerosol personal care product is pressurized to 45 psig

[0147] To 80 psig, preferably 50 psig to 75 psig, and more preferably 55 psig to 70 psig.

[0148] P. An aerosol hair care product according to paragraph O, wherein the dry shampoo composition feels dry within 10 seconds after being dispensed from the container.

[0149] Q. A method for cleaning or refreshing hair, the method comprising:

[0150] a. Providing an aerosol hair product according to paragraphs O to P;

[0151] b. Pressing the nozzle to release the dry shampoo product as an aerosol spray;

[0152] c. Applying the dry shampoo composition to the user's hair.

[0153] R. The method according to paragraph Q, wherein 0.025g to 0.2g of the oil-absorbing starch is applied to the hair within 1 second, according to the Delivery Rate Test Method, preferably 0.05g / s to 0.15g / s, more preferably 0.06g / s to 0.1g / s, and even more preferably 0.07g / s to 0.08g / s.

[0154] S. The method of paragraphs Q to 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.

[0155] T. Use of a carrier comprising volatile silicone having a viscosity of 1 cst or less, preferably 0.65 cst or less, in a dry shampoo product according to paragraphs A to N, wherein the carrier is used to provide a dry shampoo composition having 55% or less volatile organic compounds, preferably 50% or less volatile organic compounds.

[0156] U. Use of a carrier comprising volatile silicone having a viscosity of 1 cst or less, preferably 0.65 cst or less, in a dry shampoo product according to paragraphs A to N, wherein the carrier is used to deliver a dry shampoo that dries in about 10 seconds or less, absorbs oil and / or has low visible residue after application.

[0157] The dimensions and values ​​disclosed herein should not be understood as being strictly limited to the exact numerical values ​​cited. Instead, unless otherwise indicated, each such dimension is intended to represent the stated value and a functionally equivalent range around that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm".

[0158] Unless expressly excluded or otherwise limited, each document cited herein, including any cross-referenced or related patent or patent application and any patent application or patent to which this application claims priority or the benefit of, is hereby incorporated by reference in its entirety. The citation of any document is not an admission that it is prior art to any of the present invention disclosed or claimed herein, or an admission that it, by itself or in combination with any one or more of the references, proposes, suggests, or discloses any such invention. In addition, to the extent that any meaning or definition of a term in this invention conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this invention shall govern.

[0159] Although specific embodiments of the present invention have been illustrated and described, it will be apparent to those skilled in the art that various other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended that all such changes and modifications within the scope of the present invention be covered in the appended claims.

Claims

1. A dry cleaning 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; b) oil-absorbing starch, wherein the oil-absorbing starch is dispersed in the volatile organosilicon carrier; c) propellant; Wherein, the dry shampoo product comprises less than 55% volatile organic compounds, preferably less than 50% volatile organic compounds, by weight 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 of claim 2, wherein the hexamethyldisiloxane is present at greater than 20%, preferably greater than 30%, more preferably greater than 40%, and even more preferably greater than 40% by weight of the dry shampoo product.

4. A dry shampoo product according to any preceding claim, wherein the oil absorbing starch is selected from rice starch, corn starch, potato starch, tapioca starch or mixtures thereof.

5. A dry shampoo product according to any preceding claim, wherein the oil absorbing starch is present at 3% to 12%, preferably 3% to 12% and more preferably 6% to 10% by weight of the dry shampoo product.

6. A dry shampoo product according to any preceding claim, wherein the propellant is free of 1,1-difluoroethane.

7. A dry shampoo product according to any preceding claim, wherein the product is formulated to be free of water and ethanol.

8. A dry shampoo product according to any preceding claim, wherein the product is formulated to be free of polymers and surfactants.

9. A dry shampoo product according to any preceding claim further comprising a rheology modifier and / or a polar activator modifier or polar activator.

10. The dry shampoo product of claim 9, wherein the rheology modifier comprises a water-swellable clay; wherein the water-swellable clay is selected from the group consisting of laponite, bentonite, montmorillonite, smectite, hectorite, or mixtures 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 mixtures thereof.

12. A dry shampoo product according to claims 9 to 11, wherein the rheology modifier and / or the polar activator is present in a combined 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% by weight of the dry shampoo product.

13. An aerosol hair care product, comprising: a. an aerosol container, the aerosol container comprising a pressurizable container and an actuator; and b. A dry shampoo product according to any preceding claim, said dry shampoo product being provided in said pressurizable container; Wherein the aerosol personal care product is pressurized to 45 psig to 80 psig, preferably 50 psig to 75 psig, and more preferably 55 psig to 70 psig according to the Pressure Test Method.

14. The aerosol hair care product of claim 13, wherein the dry shampoo composition feels dry within 10 seconds after being dispensed from the container.

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

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