Cooling personal care compositions comprising a polyol and a polyoxyethylene-polyoxypropylene block copolymer

Abstract

The present invention relates to a personal care composition that imparts a cooling effect to the skin in an effective manner upon topical application of the composition prepared according to the invention. Thus, the present invention relates to a composition comprising a polyol, a sensory modulator and a synergistic combination of water and a polyoxyethylene-polyoxypropylene block copolymer.

Description

TECHNICAL FIELD

[0001] The present invention is in the field of personal care compositions; specifically, in the field of skin benefit compositions that impart a cooling sensation on the skin. More specifically, the present invention relates to a personal care composition containing a polyol; a polyoxyethylene-polyoxypropylene block copolymer, a block copolymer solubilizer, or a mixture thereof; a sensory modulator; and water. BACKGROUND

[0002] As the largest organ found on the human body, skin is responsible for a variety of body functions, including sensory reception, barrier protection, and physiological regulation. However, it is often desirable to expedite the occurrence of natural body functions. For example, in hot, sunny, and / or humid climates, it is desirable to apply a product that is capable of soothing or cooling the skin after intense sun exposure to aid in the skin’s temperature regulation and barrier repair. It is noted that cooling personal care compositions are becoming increasingly popular, particularly in climates such as those described above and in cultures where sunbathing is the norm. Cooling personal care compositions are also desirable when consumers, particularly medical personnel, are wearing personal protective equipment.

[0003] Traditionally, the cooling effect of personal care compositions can be achieved by including a significant level of ethanol, the volatility of which allows for rapid evaporation upon application to the skin. While effective, the cooling effect resulting from the evaporation of ethanol 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 commonly used in topical personal care compositions to impart a cooling sensation to the skin without physically cooling the skin. However, the use of such agents often results in skin irritation.

[0004] Accordingly, the present inventors have recognized a need to develop a personal care composition that is capable of providing a cooling effect while minimizing potential drawbacks such as those mentioned previously. Thus, the present invention relates to a personal care composition having a polyol; a polyoxyethylene-polyoxypropylene block copolymer, a block copolymer solubilizer, or a mixture thereof; a sensory modulator; and water.

[0005] Additional Information

[0006] Efforts to make cooling personal care compositions have been disclosed.

[0007] U.S. Patent No. 3,740,421 is directed to polyoxyethylene-polyoxyethylene propylene aqueous gels.

[0008] U.S. Patent No. 3,867,533 discloses an aqueous gel composition comprising a water-insoluble organic ingredient using a polyoxyethylene-polyoxyethylene propylene block copolymer as a gelling agent.

[0009] U.S. Patent No. 4,407,788 relates to a dentifrice containing a liquid humectant vehicle in combination with a siliceous polishing material in the presence of a resinous poly(ethylene oxide).

[0010] U.S. Patent Application Publication US 2002 / 076423 relates to a cooling cosmetic or skin formulation for after-sun care comprising chitosan, lecithin and a volatile substance.

[0011] U.S. Patent Application Publication US 2011 / 0224299 discloses a stable wax composition and uses thereof which can provide a cooling sensation when applied to the skin.

[0012] PCT Application WO 2003 / 007909 relates to a cooling cosmetic or pharmaceutical topical composition characterized by comprising methyl palmitate.

[0013] None of the above additional information describes the combination of a poly(C2-C4 alkoxylate) block copolymer, a block copolymer solubilizer or mixtures thereof; a polyol; a sensory modulator and, as claimed herein, the combination produces a cooling effect when topically applied to the skin. SUMMARY

[0014] The present inventors have discovered a personal care composition which, when topically applied to the skin, unexpectedly imparts a cooling effect without the need to include an optional traditional cooling agent.

[0015] Thus, 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 mixtures thereof in combination with a polyol, a sensory modulator and water.

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

[0017] All other aspects of the present invention will more readily become apparent upon considering the detailed description and examples which follow.

[0018] For the avoidance of doubt, the term "comprising" is meant not to be limiting to any subsequently stated elements of the composition of matter or process, but rather to encompass any element of the composition of matter or process, including those affording any additional property or characteristic, whether or not such properties or characteristics are specified in the claims. 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 recited are meant to include all sub-ranges included therein.

[0019] As used herein, the term "skin" includes skin on the face, neck, chest, back, arms, underarms, legs, hands, and scalp. As used herein, skin benefit agent means a component that (a) improves, (b) benefits, or (c) both (a) and (b) a facial or body feature such as skin features upon topical application. Personal care compositions are compositions for topical application and include lotions, gels, creams, serums, deodorants, antiperspirants, nail care agents, and cosmetics. In an especially preferred embodiment, the personal care compositions of the present application are leave-on compositions. The term "leave-on" as used herein in reference to a composition means a composition that is applied to or rubbed on the skin and left thereon. "HLB" stands for hydrophilic-lipophilic balance of a surfactant, is used to measure the degree of surfactant hydrophilicity or lipophilicity, and is widely used in the art. The term "one or more derivatives" as used herein in reference to individual ingredients means functional group substituents on the fatty acid backbone, including hydroxyl, alkoxy, and C1-C4 alkyl substituents. The term "solubilizing agent" as used herein means an ingredient that aids in the solubilization of an ingredient that would otherwise be insoluble in the medium. The use of "block polymer" in the phrase "block copolymer solubilizing agent" is meant to elucidate the chemical structure feature of the solubilizing agent, and not to elucidate the compounds that the solubilizing agent is capable of solubilizing.

[0020] Except in the Examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material should be understood as modified by the word "about". All amounts are based on the total weight of the composition, unless otherwise specified. DETAILED DESCRIPTION

[0021] The polyol compound included in the personal care compositions of the present application is a polyol type material. Typical polyols include glycerol (i.e., glycerine or glycerin), propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol, sorbitol, hydroxypropyl sorbitol, hexanediol, 1,3-butanediol, isoprene glycol, 1,2,6-hexanetriol, ethoxylated glycerol, propoxylated glycerol, and mixtures thereof. The most preferred embodiment includes glycerol, butanediol, sorbitol, or mixtures thereof. The amount of polyol used can range from 0.1 to 7 wt.%, preferably from 0.25 to 5 wt.%, and more preferably from 0.5 to 3 wt.%, based on the weight of the personal care composition.

[0022] Another component of the personal care compositions according to the present application is a copolymer surfactant, i.e., a poly(C2-C4alkoxy) block copolymer. The polymer comprises at least one alkylene oxide unit selected from the formula (C2H4O) noxyethylene chains of the formula (C2H4O)nwherein n is selected from an integer from 2 to 200, preferably from 5 to 150, and oxypropylene chains of the formula (C3H6O)n' wherein n' is selected from an integer from 2 to 100, preferably from 5 to 80. n′ oxyethylene chains of the formula (C2H4O)nwherein n is selected from an integer from 2 to 200, preferably from 5 to 150, and oxypropylene chains of the formula (C3H6O)n' wherein n' is selected from an integer from 2 to 100, preferably from 5 to 80. n oxyethylene chains of the formula (C2H4O)nwherein n is selected from an integer from 2 to 200, preferably from 5 to 150, and oxypropylene chains of the formula (C3H6O)n' wherein n' is selected from an integer from 2 to 100, preferably from 5 to 80. n′ The polyoxyethylene-polyoxypropylene block copolymer main chain terminates at one end with a hydroxyl end and at the other end with a hydroxide end. The chemistry of the polyoxyethylene-polyoxypropylene block copolymer provides for a greater number of ethylene oxide groups than a 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. Further, the polyoxyethylene-polyoxypropylene block copolymer suitable for use in the present application is branched. In another preferred embodiment, the polyoxyethylene-polyoxypropylene block copolymer contains branched propylene oxide groups. The block copolymer has an HLB value of from 12 to 29, preferably from 14 to 28, more preferably from 16 to 27. The number average (Mn) molecular weight of the block copolymer is from 5,000 to 20,000, preferably from 7,000 to 19,000, most preferably from 8,000 to 18,000 based on hydroxyl value according to ASTM E222-17 Standard Test Method. In a particularly preferred embodiment, poloxamer 407, poloxamer 338, or mixtures thereof are used in the present application. Poloxamer 407 is available from BASF under the trade name KOLLIPHOR® 407. Poloxamer 338 is available from BASF under the trade name KOLLIPHOR® 338. Poloxamer 188 is available from BASF under the trade name KOLLIPHOR® 188. Poloxamer 407 has a molecular weight of 14,000 daltons, a hydroxyl value of 47 mg KOH / g, and an HLB value of 17. Poloxamer 338 has a molecular weight of 8,000 daltons, a hydroxyl value of 95 mg KOH / g, and an HLB value of 23. Poloxamer 188 has a molecular weight of 5,000 daltons, a hydroxyl value of 180 mg KOH / g, and an HLB value of 23. F127 is commercially available from supplier BASF under the trade name KOLLIPHOR® F127. Poloxamer 308 is commercially available from BASF under the trade name KOLLIPHOR® 308. Poloxamer 188 is commercially available from BASF under the trade name KOLLIPHOR® 188. Poloxamer 407 has a molecular weight of 14,000 daltons, a hydroxyl value of 47 mg KOH / g, and an HLB value of 17. Poloxamer 338 has a molecular weight of 8,000 daltons, a hydroxyl value of 95 mg KOH / g, and an HLB value of 23. Poloxamer 188 has a molecular weight of 5,000 daltons, a hydroxyl value of 180 mg KOH / g, and an HLB value of 23. F108 is commercially available from BASF under the trade name KOLLIPHOR® F108. The total concentration of the polyoxyethylene-polyoxypropylene block copolymer can be from 0.05 to 10 wt.%, preferably from 0.1 to 8 wt.%, most preferably from 0.2 to 5 wt.% by weight of the personal care composition.

[0023] It is within the scope of the present application to use a block copolymer solubilizer in place of or in combination with the copolymer surfactants described above. In one embodiment of the present application, the block copolymer solubilizer material is an ethylene oxide-propylene oxide polymerized polyethylene glycol-polypropylene glycol block copolymer reaction product. The block copolymer solubilizer has an HLB value of from 8 to 17, preferably from 9 to 15, more preferably from 10 to 13. The number average molecular weight of the block copolymer solubilizer is from 5,000 to 20,000, preferably from 7,000 to 19,000, most preferably from 8,000 to 18,000 based on hydroxyl value according to ASTM E222-17 Standard Test Method. A block copolymer solubilizer suitable for use in the present application is available as PEG / PPG-116 / 66 copolymer from BASF under the trade name KOLLIPHOR® HS 15. KOLLIPHOR® HS 15 has a molecular weight of 8,000 daltons, a hydroxyl value of 95 mg KOH / g, and an HLB value of 23. L1220 is commercially available. The total concentration of block copolymer solubilizer can range from 0.05 to 10 wt.%, preferably from 0.1 to 8 wt.%, most preferably from 0.2 to 5 wt.%, by weight of the personal care composition.

[0024] The cool personal care composition of the present application comprises a sensory modulator. Non-limiting examples of sensory modulators include straight chain or branched chain C9-C 22 alkanes; straight chain or branched chain C5-C 18 fatty acid esters; silicones or mixtures thereof. Derivatives of such sensory modulators can also be suitable for use. The sensory modulator can be present in the present application in an amount of 0.1 to 5%, preferably 0.2 to 3%, most preferably 0.3 to 2%.

[0025] straight chain or branched chain variants of alkanes (C9-C 22 ) can be used in the present application. Thus, hydrocarbons are included within the scope of the present application. Suitable hydrocarbons can include mineral oil and polyalphaolefins. Examples of preferred volatile hydrocarbons include polydecenes such as 12 - C 15 isoparaffins and any mixture thereof.

[0026] fatty acid esters (C5-C 18 ) are also suitable for use in the personal care composition of the present application. Illustrative, but non-limiting examples include fatty acid esters derived from acid precursors such as neopentanoic acid (e.g., neopentanoic acid isodecyl ester), isononanoic acid (e.g., ethylhexyl isononanoate, isononyl isononanoate, isononyl isodecyl isononanoate, and PEG-2 diisononanoate), 2-ethylhexanoic acid (e.g., PEG-2 diethylhexanoate, isodecyl 2-ethylhexanoate), decanoic acid (e.g., hexyl decanoate), octanoic acid (e.g., coco- octanoate, propylheptyl octanoate, caprylyl octanoate), isostearic acid (e.g., methylheptyl isostearate), enanthic acid (e.g., neopentyl glycol dienanthate), myristic acid (e.g., isopropyl myristate), palmitic acid (e.g., isopropyl palmitate), or mixtures thereof.

[0027] Use of ingredients from the group known as triglycerides is also within the scope of the present application. Exemplary, but non-limiting examples are sunflower seed oil, cottonseed oil, rapeseed oil, grape seed oil, soybean oil, castor oil, borage oil, olive oil, shea butter, jojoba oil, and mixtures thereof. Glycerol monoesters and glycerol diesters can also be useful. Examples of these classes are glyceryl monostearate and glyceryl distearate. The amount of triglyceride can range from 0.01 to 10 wt.%, preferably from 0.1 to 8 wt.%, by weight of the composition.

[0028] Suitable silicones for use can be classified as volatile and non-volatile. The amount can be, for example, 0.01 to 25% by weight, more preferably 0.1 to 20% by weight, based on the weight of the composition. As used herein, the term "volatile" refers to those materials which have a measurable vapor pressure at 25°C. The volatile silicone oil is preferably selected from cyclic (cyclomethicone) or linear polydimethylsiloxanes containing 3 to 9, more preferably 4 to 5 silicon atoms.

[0029] Non-volatile silicones useful in the composition include polyalkylsiloxanes, polyalkylarylsiloxanes, and polyether siloxane copolymers. The substantially non-volatile polyalkylsiloxanes useful herein include, for example, dimethicones having a viscosity of about 5 x 10 -6 to 0.1 m 2 / s at 25°C. Emulsified and non-emulsified silicone elastomers are also suitable for use in the personal care compositions of the present application.

[0030] The personal care composition of the present application can also include a cosmetically acceptable vehicle. Such a cosmetically acceptable vehicle can be aqueous or emulsion. An oily carrier will form an emulsion system as a carrier in the presence of water and emulsifiers. Preferably, the composition is aqueous or emulsion, especially oil-in-water emulsion. The personal care composition is typically, but not limited to, in the form of a gel. Suitable carriers for use in the present application include water, sea water, rose water (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), grape water (e.g. Vitis Vinifera fruit water and grape juice). In a particularly preferred embodiment, the carrier will be water and the final personal care composition is an aqueous gel. The cosmetically acceptable vehicle will typically form 70 to 98% by weight of the personal care composition, preferably 75 to 97% by weight, more preferably 80 to 95% by weight, and can form the balance of the composition in the absence of other cosmetic adjuncts. In a preferred embodiment, the carrier is at least 80% by weight water, based on the weight of the cosmetically acceptable vehicle.

[0031] Fragrances, thickeners, skin benefit agents, fixatives, and abrasives can optionally be included in the personal care compositions of the present application. By skin benefit agents suitable for use in the present application is meant to include, but is not limited to, sunscreen agents, colorants, moisturizers, emollients, occlusive agents, botanical extracts, optical agents, cooling agents, lightening agents, anti-inflammatory agents, anti-acne agents, sunblocks, photostabilizing agents, surfactants, wrinkle-reducing agents, desquamation-promoting agents, exfoliating agents, mixtures thereof, and the like. When used, each of these can range from 0.05 to 5 wt.%, preferably from 0.1 to 3 wt.%, based on the total weight of the personal care composition.

[0032] The personal care composition can optionally include from 0.05 to 10 wt.%, more preferably from 0.1 to 5 wt.%, even more preferably from 0.25 to 4 wt.%, of one or more thickening agents, by weight of the personal care composition. Useful thickening agents include polysaccharides including starches, natural / synthetic gums, and celluloses. Suitable starches include tapioca starch, corn starch, potato starch, aluminum starch octenylsuccinate, and sodium hydroxypropyl starch phosphate. Suitable gums include xanthan gum, sclerotium gum, pectin, gum karaya, gum arabic, agar, guar gum, carrageenan, alginates, and combinations thereof. Suitable celluloses include hydroxypropyl cellulose, hydroxypropyl methylcellulose, ethyl cellulose, and sodium carboxymethyl cellulose. Synthetic polymers useful as thickening agents are also suitable, including polyacrylamides, carbomers, taurate copolymers, and acrylate-based polymers.

[0033] Fatty acids can also be useful ingredients for incorporation into the present application. The term "fatty" refers to a carbon chain length of 10 to 30 carbon atoms. Examples of this class are nonanoic 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 wt.% of fatty acid is present in the composition.

[0034] Waxes and wax esters are also suitable for use in the present application. These waxes include petroleum-derived waxes (e.g., solid paraffin, petrolatum, microcrystalline wax), animal-derived waxes or those from animal by-products (e.g., beeswax, whale wax, Chinese wax, wool wax, shellac wax), plant-derived waxes (e.g., tri-behenin, carnauba wax, candelilla wax, bayberry wax, jojoba wax, orange wax, rice wax, sunflower wax, castor wax, soy wax), mineral waxes (e.g., montan wax, paraffin wax, ozokerite), and synthetic derivatives of natural waxes. If used, the amount of waxes and wax esters can range from 0.01 to 10 wt.%, preferably from 0.1 to 8 wt.%, by weight of the composition.

[0035] Emulsifiers are optionally present in the personal care compositions of the present application. Emulsifiers are typically used when the desired cosmetically acceptable vehicle is an emulsion. Suitable emulsifiers for use in the present application have an HLB of from 2.5 to 17. When a water continuous emulsion is desired, the emulsifiers used have an HLB value of from 8 to 17, preferably from 8.5 to 15, most preferably from 9 to 14, including all ranges subsumed therein.

[0036] When used, the total concentration of emulsifiers can range from 0.1 to 20 wt.%, preferably from 1 to 10 wt.%, most preferably from 1 to 8 wt.%, by weight of the composition, including all ranges subsumed therein. The emulsifiers can be selected from anionic, nonionic, cationic and amphoteric surfactants. Particularly preferred nonionic surfactants are those having a C 10 -C 20 Fatty alcohol or fatty acid hydrophobe; C2-C 10 Alkyl phenol; mono- and di-fatty acid esters of ethylene glycol; fatty acid monoglycerides; sorbitan mono- and di-C8-C 20 Fatty acid; and polyoxyethylene sorbitan and combinations thereof. Alkyl polyglycoside and sugar fatty amides (e.g. methyl glucamide) are also suitable nonionic emulsifiers.

[0037] Preferred anionic emulsifiers include alkyl ether sulfate and sulfonate salts, alkyl sulfate and sulfonate sodium salts, alkyl benzene sulfonate salts, alkyl and dialkyl sulfosuccinate salts, C8-C 20 Acyl isethionate, C8-C 20 Acyl methyl isethionate, C8-C 20 Acyl methyl taurate, C8-C 20 Alkyl ether phosphate, alkyl ether carboxylate or combinations thereof.

[0038] Cationic emulsifiers that can be used include, for example, palmitamidopropyl trimethyl ammonium chloride, distearyldimethyl ammonium chloride, a bis-ester quaternary ammonium compound (e.g. distearyethyl dimethyl ammonium chloride) or mixtures thereof.

[0039] Useful amphoteric emulsifiers include cocamidopropyl betaine, C 12 -C 20 Trialkyl betaine, sodium lauroamphoacetate and sodium lauryl di-amphoacetate or mixtures thereof.

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

[0041] The personal care compositions of the present application can include vitamins as desirable 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 can also be used. For example, derivatives of vitamin C 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 niacin. If used, the total amount of vitamin when present in the personal care compositions according to the present application can range from 0.001 to 10 wt.%, preferably from 0.01 to 5 wt.%, more preferably from 0.05 to 2.5 wt.%, by weight of the personal care composition.

[0042] Other additional skin benefit agents suitable for use in the compositions of the present application include minerals and skin nutrients such as milk; magnesium, calcium, copper, zinc, and other metallic components; retinoic acid and derivatives thereof (e.g., cis and trans); retinaldehyde; retinol; retinyl esters such as retinyl acetate, retinyl palmitate, and retinyl propionate; alpha-hydroxy acids, beta-hydroxy acids, e.g., salicylic acid and derivatives thereof (e.g., 5-octanoyl salicylic acid, heptyloxy-4-salicylic acid, and 4-methoxysalicylic acid); resorcinol derivatives (particularly 4-substituted resorcinol derivatives, including 4-ethylresorcinol, 4-isopropylresorcinol, 4-hexylresorcinol, 4-cyclopentylresorcinol, 4-cyclohexylresorcinol, and acylated forms thereof); piceid; sugar isomers; ceramides (e.g., ceramide 1, ceramide 3, ceramide 3B, and ceramide 6) and pseudoceramides; allantoin; pentaerythrityl tetra-di-t-butyl hydroxyhydrocinnamate; pyrrolidone carboxylic acid (PCA) salt derivatives, including zinc PCA and sodium PCA; skin benefit acids such as 12-hydroxystearic acid, opipari acid, conjugated linoleic acid, octadecanoic acid; hyaluronic acid and salt derivatives thereof; mixtures thereof, and the like. Although the cooling capacity of the system is adequate, a cooling agent can optionally be added to increase the cooling sensation on the skin, including menthol or derivatives thereof, camphor or derivatives thereof, and ionic compounds such as ammonium salts. Ethanol can also be optionally added for cooling of the skin. Such skin benefit agents, when used, collectively comprise from 0.001 to 12 wt.% of the personal care composition.

[0043] A variety of plant extracts can optionally be included in the personal care compositions of the present application. The extracts can be dissolved in water or oil carried in solvents which are hydrophilic or hydrophobic, respectively. In a preferred embodiment, water or ethanol is the extraction solvent. Illustrative examples include those extracted from green tea, yarrow, chamomile, licorice, aloe vera, honeybush, willow bark, alfalfa, seaweed, witch hazel, sage, thyme, and rosemary, as well as those derived from sea buckthorn, moringa, argan, avocado, calendula, kelp, and marula. Other essential oils imparting a cooling effect can optionally be used, including those extracted from peppermint, spearmint, lavender, eucalyptus, sandalwood, and vetiver. Soybean extract can be used, especially when it is desirable to include retinol. If used, these extracts can be included at 0.001 to 12 wt% by total weight of the personal care composition.

[0044] Traditional buffering agents or pH adjusting agents are also suitable for inclusion in the personal care compositions of the present application. These include common additives such as sodium hydroxide, potassium hydroxide, hydrochloric acid, citric acid, triethanolamine, tetrahydroxypropyl ethylenediamine, and amino methy propanol. In a preferred embodiment, the personal care compositions of the present application have a pH of from 3 to 8, more preferably from 3.25 to 7.75, most preferably from 4 to 7.5. The personal care compositions of the present application preferably have a viscosity of from about 1,000 to about 120,000 cps, most preferably from about 5,000 to 80,000 cps, measured at 25°C and 1 s -1 Shear rate conditions are measured using a strain controlled parallel plate rheometer available from suppliers such as T. A. Instruments under the name Discovery. Alternatively, viscosity can also be measured using a Brookfield viscometer (spindle 6, at 20 rpm, helipath off, at 25°C for 30 seconds).

[0045] Preservatives can be incorporated into the compositions of the present application as desired to prevent the growth of potentially harmful microorganisms. Personal care product chemists are familiar with suitable preservatives and often select them to satisfy preservative testing and product stability testing. The choice of a preservative system should take into account the use of the composition and possible incompatibilities between the preservative and other ingredients in the formulation. Illustrative examples of preservatives for use in the compositions of the present application include, but are not limited to, iodopropynyl butylcarbamate (IPBC), phenoxyethanol, ethylhexylglycerin, methyl paraben, propyl paraben, imidazolidinyl urea, sodium dehydroacetate, sodium benzoate, benzoic acid, alkyl esters of p-hydroxybenzoic acid, benzyl alcohol, p-hydroxyacetophenone, DMDM hydantoin derivatives, climbazole, propionate salts, and various quaternary ammonium compounds. When used, preservatives are preferably used in amounts of 0.01 to 2 wt% by weight of the composition, including all ranges subsumed therein.

[0046] The personal care compositions of the present application are compositions suitable for topical application to human skin to provide a skin benefit, particularly leave-on products. Preferably, the term includes gels, particularly moisturizers, and not make-up products. Most preferably, the leave-on compositions.

[0047] Many types of packaging are available for storing and delivering the end use compositions of the present application. The choice of packaging depends on the end use of the personal care and the viscosity of the composition itself. As an example, leave-on emulsions and creams for the skin typically use plastic containers with an opening at the dispensing end covered by a suitable closure. Conventional closures include hinged lids with pull caps and screw caps. Typically, patches, bottles, tubes, roll-ball applicators, squeeze containers, or jars with lids are preferred.

[0048] The cooling effect of the personal care compositions on skin can be measured with an IR thermometer, such as the Fluke 62 Mini IR thermometer commercially available from Fluke Corporation. At 25°C and atmospheric conditions, the initial skin temperature of a panelist's forearm is measured using the IR thermometer and recorded. The samples are weighed using a conventional scale and weigh boat, and 0.5 grams of each sample is measured. Each sample is individually distributed evenly along the panelist's forearm for 30 seconds. The IR thermometer is used to scan the total area of the applied product and the initial drop in skin temperature after application is recorded. Subsequent temperature measurements are taken at specified intervals (e.g., every 30 seconds) until the absolute minimum temperature is determined. The difference between the initial temperature measurement and the absolute minimum temperature measurement is expressed as ΔT avg The ΔT avg values obtained from the application of sample compositions prepared according to the present application are compared to the ΔT avg values of an anchoring composition.

[0049] The present application will now be described in the context of the following specific, non-limiting examples, which are intended to assist in a better understanding of the present application. Those of ordinary skill in the art will realize that variations of the present application different from those given can be practiced without departing from the teachings of the present application.

[0050] Examples

[0051] All samples were prepared by mixing the above 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 the anchoring composition) prepared from to have a cooling effect Active natural skin soothing moisturizing cream Active Naturals Skin Relief Moisturizing Cream with Cooling Action) is commercially available. For the purposes of the present invention, the anchoring composition used herein contains a polyol (i.e. glycerin), a sensate (i.e. dimethicone) and menthol.

[0053] Example 1 : Full base formula according to the present invention

[0054] Ingredient Wt % Water q.s. Preservative 0.25 Colorant (0.0075%) 0.38 Glycerin 1.0 Sunscreen 0.50 Poloxamer 0.50 Acrylates / C 10-30 Alkyl Acrylate Crosspolymer 0.50 Petrolatum 0.01 Dimethicone 0.50 Cyclopentasiloxane 0.50 Vitamin 0.01 Preservative 0.60 pH Adjuster (85%) 0.88 Fragrance 0.40 Skin Benefit Agent 1.0 Menthol 0.10

[0055] The full formula shows the base formula used in the following experiments with modifications. The full formula is hereinafter referred to as "FF"

[0056] Example 2: Influence of the presence of menthol in the FF on the cooling effect

[0057]

[0058] The results show that the full formula prepared according to the present invention leads to an unexpected average temperature drop (AT avg ) of the skin surface of nearly 2°C greater than the anchoring sample. It can also be seen that the full formula with or without menthol will lead to the same results with a negligible influence on the average temperature drop.

[0059] Example 3: Influence of different copolymer surfactants and / or block copolymer solubilizers on the cooling effect

[0060]

[0061] is a collection of trade names of surfactants comprising ethylene oxide and propylene oxide units or reaction products of such units, which are commercially available from BASF. F127, F108 and The chemical names of L1219, L1220 and L1211 are poloxamer 407, poloxamer 338 and PEG / PPG-116 / 66 copolymer, respectively.

[0062] The results show that replacing the copolymer surfactant with other copolymer surfactants or block copolymer solubilizers can lead to similar AT avg values on the skin surface.

[0063] Example 4: Influence of different sensate levels on the cooling effect

[0064]

[0065] All sample compositions in Example 4 were prepared using poloxamer 407 and show the effect of varying the level of sensory modulator (i.e. cyclopentasiloxane) on coolness. Thus, one of ordinary skill in the art can see that increasing levels of sensory modulator result in a similar decrease in ΔΤ avg .

[0066] Example 5: Effect of different sensory modulators on coolness

[0067]

[0068] All sample compositions in Example 5 were made using 0.5% poloxamer 407. Modifications to the full formula prepared from the composition in Example 1 all contained a consistent level of 1.25% glycerin. Surprisingly, it can be seen that replacing a particular sensory modulator with another can result in a similar or even more pronounced average temperature drop on the surface of the skin compared to the full formula.

[0069] In this particular example, the C 12-17 alkane used was commercially available from Sonneborn under the trade name , the C 14-22 alkane used was commercially available from Sonneborn under the trade name , the dimethicone 5 cSt used was commercially available from Dow Corning under the trade name XIAMETER TM PMX-200 Silicone Fluid 5 cSt.

[0070] Example 6: Effect of different polyols on coolness

[0071]

[0072] All sample compositions in Example 6 were prepared using 0.5% poloxamer 407 and 0.5% cyclopentasiloxane. The results surprisingly show that using different polyols can result in a similar or greater average temperature drop on the surface of the skin compared to the full formula. In the sample prepared with pentylene glycol, although a lower drop in ΔΤ avg was shown compared to the FF, an additional drop of about 1 °C in ΔΤ avg over the anchor composition was shown.

[0073] Example 7: Effect of polyol and / or copolymer surfactant on coolness

[0074]

[0075]

[0076] All sample compositions in Example 7 were made using poloxamer 407. By varying the level of glycerin and copolymer surfactant, the results of this example show that there is some fluctuation. Notably, this fluctuation is not significant until the level of glycerin in the composition is at least 10%. However, even after this drop in effectiveness is observed, the cooling effect obtained in all samples containing 10% glycerin is still comparable to the cooling effect of the anchor formulation.

Claims

1. A personal care composition comprising: (a) from 0.5 to 3 wt.%, by weight of the personal care composition, of a polyol comprising glycerin, butylene glycol, sorbitol, or a mixture thereof; (b) from 0.2 to 5 wt.%, by weight of the personal care composition, of a polyoxyethylene-polyoxypropylene block copolymer, an ethylene oxide-propylene oxide polymerized polyethylene glycol-polypropylene glycol block copolymer reaction product, or a mixture thereof; (c) from 0.3 to 2 wt.%, by weight of the personal care composition, of an organoleptic modulator, The sensory modulators include linear or branched C9-C 21 alkanes, C5-C 18 fatty acid esters, silicones or mixtures thereof; and (d) a carrier which is water, wherein the personal care composition is an aqueous gel, and the carrier comprises from 80 to 98 wt.% of the personal care composition.

2. The personal care composition according to claim 1, wherein the polyoxyethylene-polyoxypropylene block copolymer comprises at least one olefinic unit selected from the formula (C2H4O). n A chain of ethylene oxide, wherein n is selected from integers from 2 to 200; at least the formula (C3H6O) n′ The oxypropylene chain, wherein n′ is selected from integers from 2 to 100; and includes the formula (C2H4O). n The ethylene oxide chain and formula (C3H6O) n′ Random and block copolymers of oxypropylene chains.

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

2.

4. The personal care composition of any one of claims 1 to 3, wherein the polyoxyethylene-polyoxypropylene block copolymer has an HLB value of from 12 to 29.

5. The personal care composition of any one of claims 1 to 3, wherein the polyoxyethylene-polyoxypropylene block copolymer has an HLB value of from 14 to 28.

6. The personal care composition of any one of claims 1 to 3, wherein the block copolymer solubilizer has an HLB value of from 8 to 17.

7. The personal care composition of any one of claims 1 to 3, wherein the block copolymer solubilizer has an HLB value of from 9 to 15.

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

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

10. The personal care composition of claim 1, wherein the composition comprises from 0.05 to 10 wt.% of the polyoxyethylene-polyoxypropylene block copolymer, block copolymer solubilizer, or mixture thereof.

11. Use of the composition of claim 1 to cool the skin after application.

12. The personal care composition of claim 1, wherein the composition further comprises menthol, camphor, ethanol, a cooling agent, or a mixture thereof.

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