Cooling personal care compositions comprising polyols and polyoxyethylene polyoxypropylene block copolymers

Abstract

The present invention relates to personal care compositions that have an effective method of imparting a cooling effect to the skin upon topical application of the compositions prepared in accordance with the present invention. Accordingly, the present invention relates to compositions comprising a synergistic combination of a polyol, a functional modifier, and water with a polyoxyethylene-polyoxypropylene block copolymer.

Description

[Technical Field]

[0001] The present invention is in the field of personal care compositions, particularly skin benefit compositions that provide a cooling sensation to the skin. More particularly, the present invention relates to personal care compositions containing a polyol, a polyoxyethylene-polyoxypropylene block copolymer, a block copolymer solubilizer, or a mixture thereof, a sensory modifier, and water. [Background technology]

[0002] As the largest organ found in the human body, skin is responsible for a wide range of bodily functions, including sensory reception, barrier protection and physiological regulation.However, in many cases, it is desirable to accelerate the speed at which natural bodily functions occur.For example, in hot, sunny, and / or humid climates, it is ideal to apply a product that can soothe or cool the skin after being exposed to strong sunlight, in order to support skin thermoregulation and barrier repair.It should be noted that cooling personal care compositions are becoming increasingly popular, especially in such climates and in cultures where sunbathing is the norm.Cooling personal care compositions are also desirable for use by consumers, especially medical professionals, when they are wearing personal protective equipment.

[0003] Traditionally, the cooling effect of personal care compositions can be achieved by including a significant level of ethanol, whose volatility allows for rapid evaporation upon application to the skin.Although effective, the cooling effect caused by ethanol evaporation lasts for a relatively short period of time and can dry out the skin.In addition, cooling agents such as menthol, camphor, or ionic compounds, i.e., ammonium salts, are often used in topical personal care compositions to provide a cooling sensation to the skin without physically cooling the skin.However, the use of such agents can often result in skin sensitization.

[0004] Therefore, the present inventors have recognized a need to develop a personal care composition that provides a cooling effect while minimizing the aforementioned potential drawbacks. Accordingly, the present invention is directed to a personal care composition having a polyol, a polyoxyethylene-polyoxypropylene block copolymer, a block copolymer solubilizer, or a mixture thereof, a sensory modifier, and water.

[0005] Additional Information Efforts to create cooling personal care compositions have been disclosed.

[0006] US Patent No. 3,740,421 relates to polyoxyethylene-polyoxypropylene aqueous gels.

[0007] US Pat. No. 3,867,533 discloses an aqueous gel composition containing a water-insoluble organic component, which uses a polyoxyethylene-polyoxypropylene block copolymer as a gelling agent.

[0008] US Patent No. 4,407,788 relates to a dentifrice having a liquid humectant vehicle combined with a siliceous abrasive material in the presence of a resinous poly(ethylene oxide).

[0009] US Patent Application Publication No. 2002076423 relates to a cooling cosmetic or dermatological formulation for after-sun care comprising chitosan, lecithin, and a volatile substance.

[0010] US Patent Application Publication No. 20110224299 discloses stabilized wax compositions and uses thereof that can provide a cooling sensation when applied to the skin.

[0011] PCT Application WO 2003 / 007909 relates to cooling cosmetic or pharmaceutical topical compositions characterized by the inclusion of methyl palmitate.

[0012] None of the above additional information describes the combination of poly(C2-C4 alkoxylate) block copolymers, block copolymer solubilizers or mixtures thereof, polyols, functional modifiers, and water that provides a cooling effect when topically applied to the skin as claimed in the present invention. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] U.S. Patent No. 3,740,421 [Patent Document 2] U.S. Patent No. 3,867,533 [Patent Document 3] U.S. Patent No. 4,407,788 [Patent Document 4] U.S. Patent Application Publication No. 2002076423 [Patent Document 5] U.S. Patent Application Publication No. 20110224299 [Patent Document 6] PCT Application International Publication No. 2003 / 007909 Summary of the Invention [Problem to be solved by the invention]

[0014] The present inventors have discovered a personal care composition that unexpectedly imparts a cooling effect when applied topically to the skin without the need to include any traditional cooling agents.

[0015] Accordingly, in a first aspect, the present invention relates to a cooling personal care composition comprising a polyoxyethylene-polyoxypropylene block copolymer, a block copolymer solubilizer, or a mixture thereof, in combination with a polyol, a functional modifier, and water.

[0016] In a second aspect, the present invention relates to a method of treating skin in need of treatment, comprising applying the cooling personal care composition described above onto the skin in need of treatment.

[0017] All other aspects of the present invention will become more readily apparent in light of the following detailed description and examples.

[0018] For the avoidance of doubt, the term "comprising" is meant not to be limiting to any listed elements, but to encompass unspecified elements that may be functionally significant or insignificant. Thus, the listed steps, elements, or options need not be exhaustive. Whenever the words "including" or "having" are used, these terms are meant to be equivalent to "comprising" as defined above. All ranges are meant to include all ranges encompassed.

[0019] As used herein, the term "skin" includes the skin of the face, neck, chest, back, arms, armpits, buttocks, hands, legs, and scalp. As used herein, the term "skin benefit agent" refers to (a) an ingredient that improves a facial or body characteristic after topical application, such as a skin characteristic; (b) an ingredient that provides the same benefit; or (c) both (a) and (b). Personal care compositions are compositions for topical application, including lotions, gels, creams, serums, deodorants, antiperspirants, nail treatments, and makeup. In a particularly preferred embodiment, the personal care compositions of the present invention are leave-on compositions. The term "leave-on" as used with respect to compositions herein refers to a composition that is applied to or rubbed into the skin and remains thereon. "HLB" stands for the hydrophilic-lipophilic balance of a surfactant and is used to measure the degree of hydrophilicity or lipophilicity of a surfactant and is widely used in the art. The term "derivative" as used with respect to ingredients herein refers to functional group substitutions on the fatty acid backbone, including hydroxy, alkoxy, and C1-C4 alkyl substitutions. As used herein, the term "solubilizer" refers to a component that serves to solubilize an otherwise insoluble component in a medium. The use of "block copolymer" in the phrase "block copolymer solubilizer" is meant to characterize the chemical structure of the solubilizer, rather than defining the compounds that the solubilizer can solubilize.

[0020] Except in the examples, or where otherwise expressly indicated, all numbers herein indicating quantities of ingredients should be understood to be modified by the word "about." All amounts are by total weight of the composition unless otherwise specified. DETAILED DESCRIPTION OF THE INVENTION

[0021] The polyol compounds included in the personal care compositions of the present invention are polyhydric alcohol-type materials. Typical polyhydric alcohols include glycerol (i.e., glycerin or glycerine), propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol, sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1,3-butylene glycol, isoprene glycol, 1,2,6-hexanetriol, ethoxylated glycerol, propoxylated glycerol, and mixtures thereof. Most preferred embodiments include glycerin, butylene glycol, sorbitol, or mixtures thereof. The amount of polyol used can range anywhere from 0.1 to 7%, preferably 0.25 to 5%, and more preferably 0.5 to 3% by weight of the personal care composition.

[0022] A further component of the personal care composition according to the present invention is a copolymer surfactant, i.e., a poly(C2-C4 alkoxylate) block copolymer. The polymer has the formula (C2H4O) n (wherein n is an integer selected from the range of 2 to 200, preferably 5 to 150), an oxyethylene chain of the formula (C3H6O) n (wherein n' is selected from an integer ranging from 2 to 100, preferably from 5 to 80), and at least one oxyalkylene unit selected from an oxypropylene chain of the formula (C2H4O) n an oxyethylene chain of the formula (C3H6O) nand random copolymers and block copolymers containing oxypropylene chains selected from the group consisting of the following: a polyoxyethylene-polyoxypropylene block copolymer backbone chain terminated at one end with a hydroxyl group and at the other end with a hydride group. The chemistry of the polyoxyethylene-polyoxypropylene block copolymer provides that the number of ethylene oxide groups is greater than the number of propylene oxide groups. In a preferred embodiment, the ratio of the number of ethylene oxide groups to the number of propylene oxide groups is at least 3:2. Furthermore, the polyoxyethylene-polyoxypropylene block copolymers suitable for use in the present invention are branched. In another preferred embodiment, the polyoxyethylene-polyoxypropylene block copolymer contains branched propylene oxide groups. The HLB value of the block copolymer is 12 to 29, preferably 14 to 28, and more preferably 16 to 27. The number-average (Mn) molecular weight of the block copolymer, based on the hydroxyl number measured by ASTM E222-17 standard test method, ranges from 5,000 to 20,000, preferably from 7,000 to 19,000, and most preferably from 8,000 to 18,000. In particularly preferred embodiments, poloxamer 407, poloxamer 338, or mixtures thereof are used in the present invention. Poloxamer 407 is commercially available from the supplier BASF under the trade name Pluracare® F127, and poloxamer 308 is commercially available from BASF under the trade name Pluracare® F108. The total concentration of the polyoxyethylene-polyoxypropylene block copolymer can range from 0.05 to 10%, preferably from 0.1 to 8%, and most preferably from 0.2 to 5% by weight of the personal care composition.

[0023] It is within the scope of the present invention to use a block copolymer solubilizer in place of or in combination with the above copolymer surfactants. In one embodiment of the present invention, the block copolymer solubilizer material is a polyethylene glycol-polypropylene glycol block copolymer reaction product of ethylene oxide-propylene oxide polymerization. The HLB value of the block copolymer solubilizer ranges from 8 to 17, preferably from 9 to 15, and more preferably from 10 to 13. The number average molecular weight of the block copolymer solubilizer ranges from 5,000 to 20,000, preferably from 7,000 to 19,000, and most preferably from 8,000 to 18,000, based on the hydroxyl number according to ASTM E222-17 standard test method. A block copolymer solubilizer suitable for use in the present invention is commercially available as a PEG / PPG-116 / 66 copolymer under the tradename Pluracare® L1220 by BASF. The total concentration of the block copolymer solubilizer may range from 0.05 to 10%, preferably from 0.1 to 8%, and most preferably from 0.2 to 5% by weight of the personal care composition.

[0024] The cooling personal care compositions of the present invention include a sensory modifier. Non-limiting examples of sensory modifiers include linear or branched C9-C 22 Alkanes, linear or branched C5-C 18 Examples of functional modifiers include fatty acid esters, silicones, or mixtures thereof. Derivatives of such functional modifiers may also be suitable for use. The functional modifier may be present in the present invention in an amount of 0.1 to 5%, preferably 0.2 to 3%, and most preferably 0.3 to 2%.

[0025] Linear or branched alkanes (C9-C 22 ) can be used in the present invention. Thus, it is within the scope of the present invention to include hydrocarbons. Suitable hydrocarbons may include mineral oil and polyalphaolefins. Examples of preferred volatile hydrocarbons include polydecanes such as undecane, tridecane, isodecane, isohexadecane, and isododecane, as well as C7-C8 to C 12 -C 15 isoparaffins, as well as any mixtures thereof.

[0026] Fatty acid esters (C5-C 18 ) are also suitable for use in the personal care compositions of the present invention. Illustrative, but non-limiting, examples include fatty acid esters derived from acid precursors such as pivalic acid (e.g., isodecyl neopentoate), isononanoic acid (e.g., ethylhexyl isononanoate, isononyl isononanoate, isodecyl isononanoate, and PEG-2 diisononanoic acid), 2-ethylhexanoic acid (e.g., PEG-2 diethylhexanoate, isodecyl ethylhexanoate), decanoic acid (e.g., hexyl decanoate), caprylic acid (e.g., cococaprylate, propylheptyl caprylate, caprylyl caprylate / capric acid), isostearic acid (e.g., methylheptyl isostearate), heptanoic acid (e.g., neopentyl glycol diheptanoate), myristic acid (e.g., isopropyl myristate), palmitic acid (e.g., isopropyl palmitate), or mixtures thereof.

[0027] It is also within the scope of the present invention to use components from the group known as triglycerides. Illustrative, but non-limiting, examples are sunflower seed oil, cottonseed oil, canola oil, grapeseed oil, soybean oil, castor oil, borage oil, olive oil, shea butter, jojoba oil, and mixtures thereof. Mono- and diglycerides may also be useful. Illustrative of these categories are glyceryl monostearate and glyceryl distearate. The amount of triglyceride may range from 0.01 to 10%, preferably 0.1 to 8% by weight of the composition.

[0028] Silicones suitable for use can be classified into volatile and non-volatile types. Amounts can range, for example, from 0.01 to 25%, more preferably from 0.1 to 20% by weight of the composition. As used herein, the term "volatile" refers to materials that have a measurable vapor pressure at 25°C. Volatile silicone oils are preferably selected from cyclic (cyclomethicone) or linear polydimethylsiloxanes containing 3 to 9, more preferably 4 to 5, silicon atoms.

[0029] Nonvolatile silicones useful in the composition include polyalkyl siloxanes, polyalkylaryl siloxanes, and polyether siloxane copolymers. Essentially nonvolatile polyalkyl siloxanes useful herein include, for example, polyalkyl siloxanes having a viscosity of about 5×10 at 25° C. -6 ~0.1m 2 Polydimethylsiloxanes having a viscosity of 1 / s are also suitable for use in the personal care compositions of the present invention. Emulsifying and non-emulsifying silicone elastomers are also suitable for use in the personal care compositions of the present invention.

[0030] The personal care composition of the present invention can also contain a cosmetically acceptable vehicle. This cosmetically acceptable vehicle can be aqueous or emulsion. The oily carrier in the presence of water and an emulsifier forms an emulsion system as a carrier. Preferably, the composition is aqueous or emulsion, particularly an oil-in-water emulsion. The personal care composition is usually in a gel form, but is not limited thereto. Suitable carriers for use in the present invention include water, seawater, rosewater (e.g., Rosa Damascena flower water), tea (e.g., Camellia Sinensis leaf water), Aloe Barbadensis (aloe vera) leaf juice, witch hazel (e.g., Hamamelis Virginiana extract), lavender water (e.g., Lavendula Angustifolia flower water), and grape water (e.g., Vitis Vinifera fruit water and Vitis Vinifera juice). In a particularly preferred embodiment, the carrier will be water, and the final personal care composition will be an aqueous gel. The cosmetically acceptable vehicle typically forms 70% to 98%, preferably 75% to 97%, and more preferably 80% to 95% by weight of the personal care composition, and may form the remainder of the composition in the absence of other cosmetic adjuvants. In a preferred embodiment, the vehicle is water, with at least 80% by weight of the cosmetically acceptable vehicle.

[0031] Fragrances, thickeners, skin benefit agents, fixatives, and abrasives may be included in the personal care compositions of the present invention. Skin benefit agents suitable for use in the present invention are meant to include, but are not limited to, opacifiers, colorants, moisturizers, emollients, occlusive agents, botanical extracts, optical agents, cooling agents, skin lightening agents, anti-inflammatory agents, anti-acne agents, sunscreens, light stabilizers, wrinkle reducing agents, desquamation promoters, exfoliants, mixtures thereof, and the like. Each of these materials, when used, may range from 0.05 to 5%, preferably 0.1 to 3% by weight of the total weight of the personal care composition.

[0032] The personal care composition may contain one or more thickeners, preferably in an amount of 0.05 to 10%, more preferably 0.1 to 5%, and even more preferably 0.25 to 4%, by weight of the personal care composition. Useful thickeners include starches, natural and synthetic gums, and polysaccharides, including cellulosic materials. Suitable starches include tapioca starch, corn starch, potato starch, aluminum starch octenyl succinate, and sodium hydroxypropyl starch phosphate. Suitable gums include xanthan, sclerotium, pectin, karaya, arabic, agar, guar, carrageenan, alginate, and combinations thereof. Suitable cellulosic materials include hydroxypropyl cellulose, hydroxypropyl methylcellulose, ethyl cellulose, and sodium carboxymethyl cellulose. Synthetic polymers that function as thickeners, such as polyacrylamides, carbomers, taurate copolymers, and acrylate-based polymers, are also suitable for use.

[0033] Fatty acids can also be useful ingredients to incorporate for use in the present invention. The term "fat" refers to carbon chain lengths ranging from 10 to 30 carbon atoms. Illustrative of this category are pelargonic acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, hydroxystearic acid, oleic acid, linoleic acid, ricinoleic acid, arachidic acid, behenic acid, erucic acid, and combinations thereof. When used, 0.01 to 5% by weight of fatty acids are present in the composition.

[0034] Waxes and wax esters are also suitable for use in the present invention. These waxes include petroleum-derived waxes (e.g., paraffin wax, petrolatum, microcrystalline wax), animal-derived waxes or animal by-product-derived waxes (e.g., beeswax, spermaceti, China wax, wool wax, shellac wax), plant-derived waxes (e.g., tribehenin wax, carnauba wax, candelilla wax, bayberry wax, jojoba wax, orange wax, rice wax, sunflower wax, castor wax, soy wax), mineral waxes (e.g., montan wax, ceresin wax, ozokerite), and synthetic derivatives of natural waxes. When used, the amount of wax and wax ester can range from 0.01 to 10%, preferably 0.1 to 8% by weight of the composition.

[0035] An emulsifier may be present in the personal care compositions of the present invention. Emulsifiers are often used when the desired cosmetically acceptable vehicle is an emulsion. Emulsifiers suitable for use in the present invention will have an HLB value of 2.5 to 17. When a water-continuous emulsion is desired, emulsifiers used will have an HLB value of 8 to 17, preferably 8.5 to 15, and most preferably 9 to 14, including all ranges subsumed therein.

[0036] The total concentration of emulsifier, if used, ranges from 0.1 to 20%, preferably 1 to 10%, and most preferably 1 to 8%, of the composition, including all ranges subsumed therein. The emulsifier may be selected from the group consisting of anionic, nonionic, cationic, and amphoteric surfactants. Particularly preferred nonionic surfactants are C6 condensed with about 2 to about 100 moles of ethylene oxide or propylene oxide per mole of hydrophobe. 10 -C 20 C2-C fatty alcohol or acid hydrophobe condensed with 2 to 20 moles of alkylene oxide 10 Alkylphenols, mono- and di-fatty acid esters of ethylene glycol, fatty acid monoglycerides, sorbitan, mono- and di-C8-C20 Alkyl polyglycosides and saccharide fatty amides (e.g., methyl gluconamide) are also suitable nonionic emulsifiers, including fatty acids and polyoxyethylene sorbitan, and combinations thereof.

[0037] Preferred anionic emulsifiers include alkyl ether sulfates and sulfonates, alkyl sulfates and sulfonates, alkyl benzene sulfonates, alkyl and dialkyl sulfosuccinates, C8-C 20 Acyl isethionates, C8-C 20 Acylmethyl isethionate, C8-C 20 Acylmethyl taurate, C8-C 20 Included are alkyl ether phosphates, alkyl ether carboxylates, or combinations thereof.

[0038] Cationic emulsifiers that can be used include, for example, palmitamidopropyltrimonium chloride, distearyldimonium chloride, diester quaternary ammonium compounds (e.g., distearoylethyldimonium chloride), or mixtures thereof.

[0039] Useful amphoteric emulsifiers include cocoamidopropyl betaine, C 12 -C 20 Included are trialkylbetaine, sodium lauroamphoacetate and sodium laurodiamphoeacetate or mixtures thereof.

[0040] Other generally preferred emulsifiers include glyceryl stearate, glycol stearate, stearamide AMP, PEG-100 stearate, and emulsifying / thickening additives such as hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer / squalane and mixtures thereof.

[0041] The personal care compositions of the present invention may contain vitamins as desired skin benefit agents, including derivatives thereof such as vitamin alkyl esters. Exemplary vitamins are vitamin A, vitamin B2, vitamin B3 (niacinamide), vitamin B5 (panthenol), vitamin B6, vitamin C, vitamin E, vitamin K, folic acid, and biotin. Derivatives of vitamins may also be used. For example, vitamin C derivatives include ascorbyl tetraisopalmitate, magnesium ascorbyl phosphate, and ascorbyl glucoside. Derivatives of vitamin E include tocopheryl acetate, tocopheryl palmitate, and tocopheryl linoleate. Derivatives of vitamin B3 include nicotinic acid. If used, the total amount of vitamins present in the personal care compositions of the present invention may range from 0.001 to 10%, preferably 0.01 to 5%, and optimally 0.05 to 2.5% by weight of the personal care composition.

[0042] Additional optional skin benefit agents suitable for use in the present invention include skin nutrients such as minerals and milk, magnesium, calcium, copper, zinc and other metallic components, retinoic acid and its derivatives (e.g., cis and trans), retinoic acid, retinol, retinyl esters such as retinyl acetate, retinyl palmitate, retinyl propionate, alpha hydroxy acids, beta hydroxy acids, such as salicylic acid and its derivatives (5-octanoyl salicylic acid, heptyloxy 4-salicylic acid, 4-methoxysalicylic acid, etc.), resorcinol derivatives (particularly 4-ethylresorcinol, 4-isopropylresorcinol, 4-hexylresorcinol, etc.), and the like. Examples of suitable resorcinols include 4-substituted resorcinol derivatives, including 4-cyclopentylresorcinol, 4-cyclohexylresorcinol, and their acylated forms, resveratrol, sugar isomers, ceramides (e.g., ceramide 1, ceramide 3, ceramide 3B, and ceramide 6) and pseudoceramides, allantoin, pentaerythrityl tetra-di-t-butylhydroxyhydrocinnamate, pyroglutamic acid (PCA) salt derivatives, including zinc PCA and sodium PCA, skin benefit acids, such as 12-hydroxystearic acid, petroselinic acid, conjugated linoleic acid, octadecanoic acid, hyaluronic acid and its salt derivatives, and mixtures thereof. While the cooling capacity of the system is already sufficient, cooling agents, including menthol or its derivatives, camphor or its derivatives, and ionic compounds, such as ammonium salts, can also be added to enhance the perceived cooling effect on the skin. Ethanol may also be added for use in cooling the skin. When used, such skin benefit agents collectively comprise from 0.001 to 12% by weight of the personal care composition.

[0043] A wide selection of plant extracts may be included in the personal care compositions of the present invention. The extracts may be soluble in water or oil and carried in a hydrophilic or hydrophobic solvent, respectively. In preferred embodiments, water or ethanol is the extraction solvent. Illustrative examples include extracts from green tea, yarrow, chamomile, licorice, aloe vera, citrus unshiu, willow bark, alfalfa, algae, witch hazel, sage, thyme, and rosemary, as well as oils derived from sea buckthorn, moringa, argan, avocado, calendula, algae, and marula. Other essential oils that impart a cooling effect, such as those extracted from peppermint, spearmint, lavender, eucalyptus, sandalwood, and vetiver, may also be used. Soybean extracts may also be used, particularly when retinol is desired. When used, these extracts may comprise 0.001 to 12% of the total weight of the personal care composition.

[0044] Another optional additive suitable for use includes cannabis oil containing 2.5 to 25% by weight of cannabigerol and / or 0.5 to 10% by weight of cannabidiol. When used, such oils will comprise 0.0001 to 12% by weight of the composition, preferably 0.01 to 5% by weight of the personal care composition, including all ranges subsumed therein.

[0045] Traditional buffers or pH adjusters are also suitable for inclusion in the personal care compositions of the present invention. These include common additives such as sodium hydroxide, potassium hydroxide, hydrochloric acid, citric acid, triethanolamine, tetrahydroxypropylethylenediamine, and aminomethylpropanol. In a preferred embodiment, the pH of the personal care compositions of the present invention is 3 to 8, more preferably 3.25 to 7.75, and most preferably 4 to 7.5. The viscosity of the personal care compositions of the present invention can be measured at 25°C and a shear rate of 1 s using a strain-controlled parallel plate rheometer commercially available from suppliers such as TA Instruments under the name Discovery. -1The viscosity is preferably about 1,000 to about 120,000 cps, and most preferably about 5,000 to 80,000 cps, as measured under these conditions. Alternatively, the viscosity can be measured using a Brookfield viscometer (speed of 20 rpm, spindle 6, helipath off, at 25°C for 30 seconds).

[0046] Preservatives can be incorporated into the compositions of the present invention, if desired, to protect against the growth of potentially harmful microorganisms. Personal care chemists are familiar with appropriate preservatives and routinely select them to meet preservative and product stability testing requirements. Preservative systems should be selected taking into consideration the use of the composition and possible incompatibilities between the preservative and other ingredients in the formulation. Illustrative examples of preservatives for the compositions of the present invention include, but are not limited to, iodopropynyl butylcarbamate (IPBC), phenoxyethanol, ethylhexylglycerin, methylparaben, propylparaben, imidazolidinyl urea, sodium dehydroacetate, sodium benzoate, benzoic acid, alkyl esters of parahydroxybenzoic acid, benzyl alcohol, hydroxyacetophenone, DMDM ​​hydantoin derivatives, climbazole, propionate salts, and various quaternary ammonium compounds. When used, preservatives are preferably used in amounts ranging from 0.01 to 2% of the composition, including all ranges encompassed therein.

[0047] The personal care compositions of the present invention are compositions suitable for topical application to human skin to provide skin benefits, particularly leave-on products. Preferably, this term encompasses moisturizers rather than gels, particularly finishes. Leave-on compositions are most preferred.

[0048] Many types of packaging can be used to store and deliver the end-use compositions of the present invention. The choice of packaging depends on the personal care end-use and the viscosity of the composition itself. As an example, leave-on lotions and creams for skin typically use plastic containers with a dispensing end opening covered by a suitable closure. Conventional closures include flip-top hinged lids and screw caps. Generally, patches, bottles, tubes, rollerball applicators, squeeze containers or jars with lids are preferred.

[0049] The cooling effect of a personal care composition on skin can be measured using an IR thermometer, such as the Fluke 62 Mini IR Thermometer, available from Fluke Corporation. The initial skin temperature of a panelist's forearm is measured and recorded using the IR thermometer at 25°C and ambient conditions. Samples are weighed using a conventional scale and weigh boat, with 0.5 grams of each sample measured. Each sample is individually spread evenly along the panelist's forearm for 30 seconds. The IR thermometer is used to scan the total area of ​​the applied product and record the initial decrease in skin temperature after application. Temperature measurements are then taken at specified intervals (e.g., every 30 seconds) until an absolute minimum temperature is established. The difference between the initial temperature reading and the absolute minimum temperature reading is referred to as ΔT. avg The ΔT obtained by applying the sample composition prepared according to the present invention is expressed as avg The value is the ΔT avg Compare with the value.

[0050] To facilitate a greater understanding of the present invention, it will now be described in the context of certain non-limiting examples. Those skilled in the art will recognize that variations of the present invention that differ from the examples given may be practiced without departing from the teachings of the present invention.

[0051] [Example] All samples were made by mixing the noted ingredients under conditions of moderate shear, from about 25° C. to about 75° C., and atmospheric pressure.

[0052] All samples in the following examples were compared to a control composition (hereinafter referred to as Anchor) commercially available from Aveeno® as Aveeno® Active Naturals Skin Relief Moisturizing Cream with Cooling Action. In the context of the present invention, the Anchor as used herein contains a polyol (i.e., glycerin), a functional modifier (i.e., dimethicone), and menthol.

[0053] Example 1: Fully basic formulation according to the present invention [Table 1]

[0054] This complete formulation represents the base formulation used in the following experiments, to which modifications were made. This complete formulation is hereafter referred to as "FF."

[0055] Example 2: Effect of the presence of menthol in FF on the cooling effect [Table 2]

[0056] The results show that the complete formulation made in accordance with the present invention unexpectedly reduces the average temperature drop (ΔT avg ) results in a temperature drop of almost 2°C greater than the anchor sample. It can also be seen that the complete formulation with or without menthol would achieve the same result with negligible effect on the average drop in temperature.

[0057] Example 3: Effect of different copolymer surfactants and / or block copolymer solubilizers on cooling effect [Table 3]

[0058] Pluracare® is a trade name collection of surfactants containing ethylene oxide and propylene oxide units or reaction products of such units commercially available from BASF. The chemical names for Pluracare® F127 are Pluracare® F108 and Pluracare® L1220 are poloxamer 407, poloxamer 338 and PEG / PPG-116 / 66 copolymers. The results show that replacing the copolymer surfactant with other copolymer surfactants or block copolymer solubilizers can achieve similar ΔT avg This shows that values ​​can be obtained.

[0059] Example 4: Effect of different sensory modifier levels on cooling effect [Table 4]

[0060] All sample compositions in Example 4 were made using poloxamer 407 to demonstrate the effect of varying the sensory modifier content level (i.e., cyclopentasiloxane) on cooling. Thus, one skilled in the art would be able to determine the effect of increasing the sensory modifier level on ΔT avg It can be seen that a similar decrease can occur in

[0061] Example 5: Effect of different sensory modifiers on the cooling effect [Table 5]

[0062] All sample compositions in Example 5 were made using 0.5% Poloxamer 407. All modifications to the complete formulation made according to the composition of Example 1 contain a constant level of 1.25% glycerin. Unexpectedly, it is found that replacing one sensory modifier with another can result in a similar or even greater average reduction in temperature on the surface of the skin when compared to the complete formulation.

[0063] In this particular example, the C 12-17 The alkanes used are commercially available from Sonneborn under the trade name Iris®. 14-22 The alkane is marketed by Sonneborn under the trade name Lilac®, and the dimethicone 5 cSt used is marketed by Dow Corning under the trade name XIAMETER™ PMX-200 Silicone Fluid 5 cSt.

[0064] Example 6: Effect of different polyols on cooling effect [Table 6]

[0065] All sample compositions in Example 6 were made using 0.5% poloxamer 407 and 0.5% cyclopentasiloxane. The results surprisingly show that the use of different polyols can result in a similar or greater average decrease in temperature on the skin surface when compared to the complete formulation. Samples prepared with pentylene glycol showed a significant decrease in ΔT compared to FF. avg The decrease in ΔT of the anchor is small. avg It shows a further drop of about 1°C above.

[0066] Example 7: Effect of polyol and / or copolymer surfactant on cooling effect [Table 7]

[0067] All sample compositions in Example 7 were made using poloxamer 407. By varying the levels of both glycerin and copolymer surfactant, the results of this example show some variability. Note that this variability is not observed to be significant until the glycerin content in the composition is at least 10%. However, even after this decrease in effectiveness is observed, the cooling effect achieved is comparable to that of the anchor formulation across all samples with 10% glycerin.

Claims

1. 1. A personal care composition comprising: (a) 0.5 to 3% by weight of the personal care composition of a polyol, the polyol comprising glycerin, butylene glycol, sorbitol, or a mixture thereof; (b) 0.2 to 5% by weight of the personal care composition of a polyoxyethylene-polyoxypropylene block copolymer, a block copolymer solubilizer (a polyethylene glycol-polypropylene glycol block copolymer, which is a reaction product of ethylene oxide-propylene oxide polymerization), or a mixture thereof; (c) 0.3 to 2% by weight of the personal care composition of a sensory modifier, wherein the sensory modifier is a linear or branched C ９ -C ２１ Alkanes, C ５ -C １８ a functional modifier comprising a fatty acid ester, a silicone, or a mixture thereof; (d) a carrier which is water, wherein the personal care composition is an aqueous gel, and the carrier forms 80% to 98% by weight of the personal care composition.

2. The polyoxyethylene-polyoxypropylene block copolymer is Formula (C ２ H ４ O) ｎ (wherein n is an integer selected from the range of 2 to 200), an oxyethylene chain of the formula (C ３ H ６ O) ｎ at least one oxyalkylene unit selected from at least an oxypropylene chain of the formula: Formula (C ２ H ４ O) ｎ and an oxyethylene chain of the formula (C ３ H ６ O) ｎ 10. The personal care composition of claim 1, comprising a random copolymer and a block copolymer comprising oxypropylene chains selected from the group consisting of:

3. 3. The personal care composition of claim 2, wherein the number of ethylene oxide units to the number of propylene oxide units is in a ratio of at least 3:

2.

4. 4. The personal care composition of claim 1, wherein the polyoxyethylene-polyoxypropylene block copolymer has an HLB value of 12 to 29.

5. 5. The personal care composition of any one of claims 1 to 4, wherein the polyoxyethylene-polyoxypropylene block copolymer has an HLB value of 14 to 28.

6. 6. The personal care composition of any one of claims 1 to 5, wherein the block copolymer solubilizer has an HLB value of 8 to 17.

7. 7. The personal care composition of any one of claims 1 to 6, wherein the block copolymer solubilizer has an HLB value of 9 to 15.

8. 10. The personal care composition of claim 1, wherein the polyoxyethylene-polyoxypropylene block copolymer or block copolymer solubilizer has a number average molecular weight of 5,000 to 20,000.

9. 10. The personal care composition of claim 1, wherein the polyoxyethylene-polyoxypropylene block copolymer or block copolymer solubilizer has a number average molecular weight of 7,000 to 19,000.

10. 10. Use of the composition according to claim 1 for cooling the skin after application.

11. 10. The personal care composition of claim 1, further comprising menthol, camphor, ethanol, a cooling agent, or a mixture thereof.

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