Personal care compositions based on amino acid surfactants

Abstract

A minimal ingredient personal care composition comprising 9% to 16% by weight of an amino acid surfactant, 3% to 10% by weight of a glyceryl ester, 0.2% to 6% by weight of a triglyceride oil, and a liquid carrier. The personal care composition is substantially free of sulfated surfactants and has a pH of 4.5 to 6 and a yield stress of 0.5 to 10 Pa. The personal care composition can be a shampoo that is sulfate-free while also providing suitable cleaning, color retention, and / or conditioning benefits.

Description

[Technical Field]

[0001] The present disclosure relates generally to sulfated surfactant-free personal care compositions that deliver natural oils to hair for dry conditioning. [Background technology]

[0002] Natural conditioning oils have historically been added to shampoo formulations at very low levels because they are difficult to stabilize at higher concentrations in micellar shampoos. Consumers are seeking natural conditioning alternatives to silicones to deliver dry conditioning benefits to hair and skin after shampooing. To achieve similar or better conditioning benefits than silicones, higher levels of natural oils are typically required while maintaining stability. The present invention identifies a minimal component system that effectively delivers oils and provides stability for micellar unstructured shampoo systems by utilizing a unique combination of amino acid surfactants and glyceryl esters to create a structured surfactant phase that can suspend natural conditioning oils. This structured surfactant phase generates low shear yield stress, thereby suspending, stabilizing, and delivering high levels of natural oils to the hair and scalp for conditioning benefits. Summary of the Invention [Means for solving the problem]

[0003] 1. A personal care composition comprising about 9% to about 16% by weight of an amino acid surfactant, about 3% to about 10% by weight of a glyceryl ester, about 0.2% to about 6% by weight of a triglyceride oil, and a liquid carrier, the composition being substantially free of sulfated surfactants, and having a pH of about 4.5 to about 6 and a low shear yield stress of about 0.5 to about 10 Pa. [Brief explanation of the drawings]

[0004] [Figure 1] 1 is a DIC light microscope image of a personal care composition that does not contain glyceryl caprylate caprate. [Figure 2] 1 is a DIC optical microscope image of a personal care composition made according to Example 2. [Figure 3] 1 is a DIC optical microscope image of a personal care composition made according to Example 6. DETAILED DESCRIPTION OF THE INVENTION

[0005] In all embodiments of the present disclosure, all percentages are by weight of the total composition unless otherwise specified. All ratios are by weight unless otherwise specified. All ranges are inclusive and combinable. The number of significant digits does not represent a limitation on the stated amounts or on the precision of the measurements. Unless otherwise specified, all quantities are understood to be modified by the word "about." Unless otherwise specified, all measurements are understood to be made at about 25°C and ambient conditions, where "ambient conditions" means conditions of about 1 atmosphere pressure and about 50% relative humidity. All such weights relating to listed ingredients are based on the active level and do not include carriers or by-products that may be included in commercially available materials, unless otherwise specified.

[0006] As used herein, the term "charge density" refers to the ratio of the number of positive charges on a polymer to the molecular weight of that polymer.

[0007] As used herein, the term "comprising" means that other steps and other ingredients can be added that do not affect the end result. This term encompasses the terms "consisting of" and "consisting essentially of." The compositions and methods / processes of the present disclosure can comprise, consist of, and consist essentially of the inventive elements and limitations described herein, as well as any of the additional or optional ingredients, components, steps, or limitations described herein.

[0008] As used herein, the term "personal care composition" can be presented in terms of a typical personal care formulation. The composition can be in the form of a solution, dispersion, emulsion, powder, talc, capsule, sphere, sponge, solid dosage form, foam, and other delivery mechanisms. The compositions described herein can be leave-on hair products, such as hair tonics and treatments, as well as styling products; rinse-off hair products, such as shampoos, pre-wash products, co-wash products, and personal cleansing products; and treatment products, as well as any other form that can be applied to hair or skin.

[0009] As used herein, the term "polymer" is intended to include materials made by the polymerization of one type of monomer, or materials made by two or more types of monomers (ie, copolymers).

[0010] As used herein, the term "suitable for application to human hair" means that the personal care composition or its components are acceptable for use in contact with human hair and scalp and skin without undue toxicity, incompatibility, instability, allergic reaction, etc.

[0011] As used herein, the term "water-soluble" means that a substance is soluble in water. In certain embodiments, a substance may be soluble at 25°C in 0.1% by weight of water solvent, in certain embodiments, 1% by weight of water solvent, in certain embodiments, 5% by weight of water solvent, and in certain embodiments, 15% by weight or more of water solvent.

[0012] The terms "sulfate-free" and "substantially free of sulfate" mean essentially free of sulfate-containing compounds except when incidentally incorporated as a minor component. Sulfate-free contains no detectable sulfated surfactants.

[0013] The term "sulfated surfactant" means a surfactant containing a sulfate group. The term "substantially free of sulfated surfactants" means essentially free of surfactants containing sulfate groups, except when incidentally incorporated as a minor component.

[0014] Personal Care Compositions As described herein, personal care compositions are disclosed that exhibit excellent cleansing and conditioning qualities without the use or inclusion of sulfated surfactants or silicone oils.

[0015] It has historically been difficult to thicken, stabilize, and deposit triglyceride oils at levels sufficient for rinse-off personal care compositions, such as sulfate-free shampoos, to deliver dry conditioning without the use of polymeric thickeners or suspending agents, such as carbomers, EGDS, or thixotropic thickeners (e.g., trihydroxystearate). It has been discovered that sulfate-free personal care compositions that deliver effective levels of triglyceride oils can be thickened and stabilized to an equal or greater extent than sulfate-containing personal care compositions. This can be achieved through the formation of a structured surfactant phase, which is formed when a sulfate-free amino surfactant is combined with a glyceryl ester. It has also been discovered that triglyceride oils can be suspended by the structured surfactant phase and efficiently deposited on hair, scalp, and / or skin through the formation of coacervates. Coacervate-assisted delivery in this system is efficient and can deliver insoluble triglyceride oils. The formation of coacervates can be further promoted by the presence of cationic polymers.

[0016] Examples of structured surfactant phases include, but are not limited to, unilamellar and multilamellar vesicles. Unilamellar vesicles are spherical chambers bounded by a single bilayer of amphiphilic lipids or a mixture of such lipids, containing an aqueous solution within the chamber. Multilamellar vesicles comprise multiple spherical chambers bounded by multiple bilayers of amphiphilic lipids or a mixture of such lipids, containing an aqueous solution within the chamber. Oligovesicular vesicles are spherical chambers bounded by a single bilayer of amphiphilic lipids or a mixture of such lipids, containing an aqueous solution within the chamber, in addition to other independent spherical vesicles within the main vesicle.

[0017] Vesicles typically form upon pH adjustment. The formulation changes color from translucent to white. Vesicles can have unilamellar, multilamellar, and oligovesicular structures.

[0018] Figure 1 shows a DIC optical microscope image of a personal care composition with a surfactant but without glyceryl caprylate caprate. The image shows a distinct unstructured surfactant phase background. Air bubbles are shown at the bottom to identify the liquid present. Figure 2 shows a DIC optical microscope image of a personal care composition made according to Example 2, with a surfactant and glyceryl caprylate caprate forming a structured surfactant phase. Figure 3 shows a DIC optical microscope image of a personal care composition made according to the formulation of Example 6, with a surfactant and glyceryl caprylate caprate forming a structured surfactant phase. Figure 3 also shows suspended palm oil droplets.

[0019] The personal care composition may further comprise a cationic deposition polymer.

[0020] The personal care compositions described herein may be free of sulfated surfactants. Additionally, they may include an amino acid surfactant and caprylic / capric glyceryl in a 2:1 ratio. The personal care compositions described herein may be substantially free of silicones. Additionally, the personal care compositions may include less than 6% by weight of added salt, alternatively less than about 3% by weight of added salt, or alternatively from about 0% to about 6% by weight of added salt.

[0021] The personal care composition has a low shear yield stress value of from about 0.5 Pa to about 10 Pa, alternatively from about 1 to about 10 Pa. This low shear yield stress value allows for the stable inclusion of triglyceride oils. Additionally, the personal care composition may be stable at 5°C or 40°C, or at both 5°C and 40°C.

[0022] The personal care composition has a pH of from about 4.5 to about 6, alternatively from about 4.5 to about 5.5.

[0023] It may be desirable for consumers to have personal care compositions, such as shampoos, with minimal levels of ingredients. The personal care compositions described herein allow for minimal ingredient amounts, e.g., without polymeric thickeners or suspending agents, such as carbomer, EGDS, or thixotropic acid. The personal care composition in the form of a shampoo described herein may consist of the following nine ingredients: water, sodium cocoyl alaninate, caprylic / capric glyceryl, cationic polymer, triglyceride oil, sodium benzoate, citric acid, fragrance, and sodium chloride. It is understood that the fragrance may be formed from one or more fragrances. Alternatively, the personal care composition may contain eight ingredients, especially if it is fragrance-free.

[0024] Detergent surfactants The personal care composition described herein can comprise one or more cleansing surfactants.As can be understood, surfactants can promote the removal of oil and other soiling components from soiled hair, thereby providing the cleansing effect to soiled hair and hair follicles.Surfactants generally promote this cleaning due to their amphiphilic nature, which can break down surfactants and form micelles around oil and other soiling components in hair, which can then be rinsed off and removed from hair.

[0025] The detersive surfactant used in the personal care compositions described herein is an amino acid surfactant selected from the group of sodium cocoyl alaninate, sodium cocoyl glycinate, sodium cocoyl sarcosinate, disodium cocoyl glutamate, and sodium lauroyl glutamate. Amino acid surfactants also include potassium cocoyl glycinate, potassium lauroyl glycinate, potassium lauroyl sarcosinate, potassium lauroyl glutamate, potassium lauroyl alanate, potassium cocoyl alaninate, sodium cocoyl methyl beta-alanine, sodium myristoyl methyl beta-alanine, potassium lauroyl methyl beta-alanine, sodium cocoyl (arginine / aspartic acid / glutamic acid / isoleucine / leucine / lysine / phenylalanine / proline / serine / threonine / valine), sodium cocoyl / stearoyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / glutamine / glycine / histidine / isoleucine / leucine / lysine / phenylalanine / proline / serine / threonine / tyrosine / valine), and betaine. The hydroxybenzoate may be selected from the group consisting of sodium cocoyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / glycine / isoleucine / leucine / lysine / methionine / phenylalanine / proline / serine / threonine / tryptophan / tyrosine / valine), sodium olivoyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / glycine / isoleucine / leucine / lysine / methionine / phenylalanine / proline / serine / threonine / tryptophan / tyrosine / valine), potassium lauroyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / lys ... and potassium lauroyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / lysine / isoleucine / leucine / lysine / methionine / phenylalanine / proline / serine / threonine / tryptophan / tyrosine / valine).

[0026] The personal care composition contains about 5% to about 30% by weight of an amino acid surfactant, about 7% to about 15% by weight of an amino acid surfactant, alternatively about 10% to about 20% by weight of an amino acid surfactant, alternatively about 9% to about 12% by weight of an amino acid surfactant, and alternatively about 10% to about 12% by weight of an amino acid surfactant. The amino acid surfactant may be sodium cocoyl alaninate, which is a surfactant derived from a natural anionic amino acid (alanine) and coconut fatty acids. This surfactant is sulfate-free. This material is biodegradable, hypoallergenic, and gentle to the skin and eyes. Sodium cocoyl alaninate provides gentle cleansing, which leaves a pleasant moisturizing feeling after drying. Sodium cocoyl alaninate may be supplied by Ajinomoto and Sino Lion.

[0027] Co-surfactants The composition may contain about 0.01% to about 5% by weight of a co-surfactant, which is a zwitterionic surfactant. Zwitterionic surfactants are derivatives of aliphatic quaternary ammonium, phosphonium, and sulfonium compounds in which the aliphatic radical can be straight or branched, one of the aliphatic substituents contains about 8 to about 18 carbon atoms, and one contains an anionic group such as carboxy, sulfonate, sulfate, phosphate, or phosphonate. Zwitterionic surfactants include cocamidoethyl betaine, cocamidopropyl amine oxide, cocamidopropyl ... The surfactant may be selected from the group consisting of dimethylaminohydroxypropyl hydrolyzed collagen, cocamidopropyldimonium hydroxypropyl hydrolyzed collagen, cocamidopropyl hydroxysultaine, cocobetaineamidoamphopropionate, coco-betaine, coco-hydroxysultaine, coco / oleamidopropyl betaine, coco sultaine, lauramidopropyl betaine, lauryl betaine, lauryl hydroxysultaine, lauryl 5 sultaine, and mixtures thereof.

[0028] A suitable zwitterionic surfactant is lauryl hydroxysultaine. The zwitterionic surfactant may be selected from the group consisting of lauryl hydroxysultaine, cocamidopropyl hydroxysultaine, coco-betaine, coco-hydroxysultaine, coco-sultaine, lauryl betaine, lauryl sultaine, and mixtures thereof.

[0029] The co-surfactant may be a zwitterionic surfactant selected from the group consisting of lauryl hydroxysultaine, cocamidopropyl hydroxysultaine, coco-betaine, coco-hydroxysultaine, coco-sultaine, lauryl betaine, lauryl sultaine, and mixtures thereof.

[0030] triglyceride oil The personal care composition contains from about 0.2% to about 6%, alternatively from about 0.5% to about 6%, alternatively from about 0.5% to about 5%, alternatively from about 0.5% to about 3%, by weight of triglyceride oil, which is an oil derived from nuts, beans, seeds, etc., containing greater than about 80% triglycerides by weight. Triglycerides are esters derived from glycerol and three fatty acids. Triglyceride oils may contain one or more saturated or (poly)unsaturated hydrocarbon chains having 8 to 24 carbon atoms. All natural oils contain a mixture of triglycerides with fatty acids of different chain lengths and degrees of unsaturation. Triglyceride oils may include palm oil, sunflower seed oil, castor oil, almond oil, avocado oil, crambe oil, grape seed oil, wheat germ oil, rice bran oil, macadamia seed oil, palm oil, evening primrose oil, soybean oil, corn oil, tea leaf oil, hemp seed oil, olive oil, moringa oil, argan oil, apricot oil, baobab oil, batana oil, cumin oil, sesame oil, canola oil, coffee seed oil, camellia oil, marula oil, meadowfoam oil, oat kernel oil, sea buckthorn oil, tamanu oil, date oil, and combinations thereof.

[0031] Additionally, triglyceride oils may include butters including shea, mango, cocoa, and combinations thereof.

[0032] Glyceryl esters The personal care composition may contain about 5% to about 8%, about 3% to about 10%, about 4% to about 10%, or about 5% to about 6% by weight of glyceryl esters. Suitable glyceryl esters may be selected from glyceryl caprylate, glyceryl caprate, glyceryl (caprylic / capric) and mixtures thereof. Other glyceryl esters containing C8-C10 mono-, di-, and triglycerides different from C8-C10 mono-dicaprylate 1,2,3-propanetriol may also be selected. Glyceryl (caprylic / capric) is mild and substantially free of PEG, EO / PO, dioxane, and nitrogen. Multifunctional benefits include yield generation for suspending particles at elevated temperatures for product stability, viscosity control, enhanced preservative activity, scalp moisturization, wet and dry conditioning, and potential for enhanced deposition of soluble actives. Caprylic / capric glyceryl may be supplied by Stepan. Alternatively, the personal care composition may contain from about 3% to about 10% by weight of the glyceryl ester in combination with lauric acid. Lauric acid may be present in the personal care composition at from about 0.1% to about 3% by weight, or alternatively, from about 0.1% to about 2.5% by weight.

[0033] cationic polymer The personal care composition may include a cationic polymer. The cationic deposition polymer may be present at about 0.1% to about 3%, about 0.1% to about 2.0%, and about 0.1% to about 1.0% by weight. The cationic polymer may be a guar or cellulose derivative.

[0034] The cationic deposition polymer may comprise from about 0.1% to about 3%, from about 0.1% to about 2.0%, and from about 0.1% to about 1.0% by weight of the personal care composition. The cationic deposition polymer may have a weight average molecular weight of from about 500,000 to about 2,200,000 and from about 1.8 million to about 2 million, and a charge density of from about 0.4 to about 2.6, from about 0.4 to about 2, from about 0.7 to about 2, and from about 0.6 to about 1.6. Suitable polymers include KG 30M and LR 30M available from Dow.

[0035] The charge density can be measured at the pH of the intended use of the personal care composition (e.g., from about pH 3 to about pH 9, or from about pH 4 to about pH 8).

[0036] In certain embodiments, suitable cationic polymers may contain cationic nitrogen-containing moieties, such as quaternary ammonium, or cationic protonated amino moieties. The cationic protonated amine may be a primary, secondary, or tertiary amine, depending on the specific species and the selected pH of the composition. Anionic counterions may be used with the cationic polymer, as long as the cationic polymer remains soluble in water, the composition, and the cosorbate phase of the composition. Examples of suitable counterions include halide counterions (e.g., chloride, fluoride, bromide, iodide).

[0037] Non-limiting examples of suitable cationic polymers include copolymers of water-soluble spacer monomers such as acrylamide, methacrylamide, alkyl and dialkyl acrylamide, alkyl and dialkyl methacrylamide, alkyl acrylate, alkyl methacrylate, vinyl caprolactone, or vinyl pyrrolidone with vinyl monomers having cationic protonated amine or quaternary ammonium functionality.

[0038] Suitable cationic protonated amino and quaternary ammonium monomers may include vinyl compounds substituted with dialkylaminoalkyl acrylates, dialkylaminoalkyl methacrylates, monoalkylaminoalkyl acrylates, monoalkylaminoalkyl methacrylates, trialkylmethacryloxyalkylammonium salts, trialkylacryloxyalkylammonium salts, diallyl quaternary ammonium salts, and vinyl quaternary ammonium monomers having cyclic cationic nitrogen-containing rings such as pyridinium, imidazolium, and quaternized pyrrolidones, e.g., alkylvinylimidazolium, alkylvinylpyridinium, alkylvinylpyrrolidone salts.

[0039] Other suitable cationic polymers include copolymers of 1-vinyl-2-pyrrolidine and 1-vinyl-3-methylimidazolium salts (e.g., chloride salts) (available in the industry from the American Cosmetic, Toiletry, and Fragrance Association) Copolymers of 1-vinyl-2-pyrrolidine and dimethylaminoethyl methacrylate (known in the industry as Polyquaternium-11 by the CTFA), cationic diallyl quaternary ammonium-containing polymers, including, for example, dimethyldiallylammonium chloride homopolymer, copolymers of acrylamide and dimethyldiallylammonium chloride (known in the industry as Polyquaternium 6 and Polyquaternium 7 by the CTFA), amphoteric copolymers of acrylic acid, including copolymers of acrylic acid and dimethyldiallylammonium chloride (known in the industry as Polyquaternium 22 by the CTFA), terpolymers of acrylic acid, dimethyldiallylammonium chloride and acrylamide (known in the industry as Polyquaternium 39 by the CTFA), and terpolymers of acrylic acid, methacrylamidopropyltrimethylammonium chloride and methyl acrylate (known in the industry as Polyquaternium 47 by the CTFA). In certain embodiments, suitable cationic substituted monomers include cationic substituted dialkylaminoalkyl acrylamides, dialkylaminoalkyl methacrylamides, and combinations thereof. Generally, the cationic monomers can conform to Formula III:

[0040] [ka] (In the formula, R 14 is hydrogen, methyl, or ethyl, and R 15 , R 16 , and R 17are each independently hydrogen or a short-chain alkyl having 1 to 8 carbon atoms, or 1 to 5 carbon atoms, or 1 to 2 carbon atoms, n is an integer having a value of 1 to 8, or 1 to 4; and X is a counter ion. 15 , R 16 , and R 17 The nitrogen attached to R may be a protonated amine (primary, secondary, or tertiary), but may also be a quaternary ammonium (R 15 , R 16 , and R 17 and each may be an alkyl group. In certain embodiments, the cationic monomer may be polymethylacrylamidopropyltrimonium chloride, available from Rhone-Poulenc (Cranberry, NJ, USA) under the trade name Polycare 133. Copolymers of cationic monomers are also suitable in certain embodiments. In such embodiments, the charge density of the total copolymer may be from about 2.0 to about 4.5 meq / gm.

[0041] Other cationic polymers are also suitable, including polysaccharide polymers such as cationic cellulose derivatives and cationic starch derivatives. Suitable cationic polysaccharide polymers include those conforming to Formula IV:

[0042] [ka] where A is an anhydrous residue such as a starch or anhydrous cellulose residue, and R 18 is an alkyleneoxyalkylene, polyoxyalkylene, or hydroxyalkylene group, or a combination thereof; R 19 , R 20 , and R 21 are independently alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, or alkoxyaryl groups, each group containing 18 or fewer carbon atoms, and the total number of carbon atoms for each cationic moiety (i.e., R 19 , R 20 , and R 21The total number of carbon atoms in (X) is 20 or less, and X is an anionic counterion.

[0043] In certain embodiments, the cationic cellulose polymer may be selected from salts of hydroxyethyl cellulose reacted with trimethylammonium-substituted epoxides, known in the industry (CTFA) as Polyquaternium 10, available from Amerchol Corp. (Edison, NJ, USA) in the LR, JR, and KG series of polymers. Other suitable cationic cellulose polymers include polymeric quaternary ammonium salts of hydroxyethyl cellulose reacted with lauryldimethylammonium-substituted epoxides, known in the industry (CTFA) as Polyquaternium 24. These materials are available from Amerchol Corp. under the trade name Polymer LM-200.

[0044] Other suitable cationic polymers include cationic guar gum derivatives such as guar hydroxypropyltrimonium chloride. Further examples of suitable cationic guar gum derivatives include the Jaguar series available from Rhone-Poulenc Incorporated and the N-Hance series available from the Aqualon division of Hercules, Inc. Further details about cationic guar gum derivatives are disclosed in U.S. Patent No. 6,930,078, which is incorporated herein by reference.

[0045] It can be understood that other cationic polymers known in the personal care industry are also suitable.For example, quaternary nitrogen-containing cellulose ether is suitable.The example of quaternary nitrogen-containing cellulose ether is described in U.S. Patent No. 3,962,418, which is incorporated herein by reference.

[0046] In certain embodiments, synthetic cationic polymers or derivatives thereof may be useful as the cationic polymer. Generally, such synthetic cationic polymers may be included at a concentration of from about 0.025% to about 5% by weight of the personal care composition.

[0047] Suitable synthetic cationic polymers may include water-soluble or water-dispersible polymers that are cationic and non-crosslinked. In certain embodiments, suitable polymers may be conditioning copolymers that include (i) one or more cationic monomer units and (ii) one or more nonionic monomer units or monomer units having a terminal negative charge, where the copolymer has a net positive charge. In certain embodiments, the synthetic cationic polymer may have a cationic charge density of about 0.5 meq / g to about 10 meq / g and an average molecular weight of about 1,000 to about 5,000,000.

[0048] Non-limiting examples of suitable synthetic cationic deposition polymers are described in US Patent Application Publication No. 2003 / 0223951, which is incorporated herein by reference.

[0049] Other suitable cationic polymers include etherified cellulose, guar, and starch copolymers, some examples of which are described in U.S. Patent No. 3,958,581, which is incorporated herein by reference. Additional cationic polymers are also described in the CTFA Cosmetic Ingredient Dictionary, 3rd edition (eds. Estrin, Crosley, and Haynes) (The Cosmetic, Toiletry, and Fragrance Association, Inc. (Washington, DC) (1982)), which is incorporated herein by reference.

[0050] In embodiments that include a cationic polymer, the cationic polymer may be soluble in the composition or in a complex coacervate phase in the composition formed by interaction of the cationic polymer with a sulfate-free anionic, amphoteric, or zwitterionic detersive surfactant. Complex coacervates of the cationic polymer may also form with other anionic, charged materials in the personal care composition.

[0051] Techniques for analyzing the formation of complex coacervates are known in the art. For example, microscopic analysis of the composition at any selected dilution level can be used to identify whether a coacervate phase has formed. Such a coacervate phase can be identified as an additional emulsified phase in the composition. The use of dyes can help distinguish the coacervate phase from other insoluble phases dispersed in the composition. Further details regarding the use of cationic polymers and coacervates are disclosed in U.S. Pat. No. 9,272,164, which is incorporated herein by reference.

[0052] Anti-dandruff actives The personal care composition also contains an anti-dandruff agent.Suitable anti-dandruff agents may include pyridinethione salts, azoles, selenium sulfide, particulate sulfur, and mixtures thereof.Such anti-dandruff particles must be physically and chemically compatible with the essential components of the composition, and must not otherwise excessively impair the stability, aesthetics, or performance of the product.In certain embodiments, the personal care composition may include a cationic polymer to enhance the adhesion of anti-dandruff actives.Particularly suitable anti-dandruff actives include zinc pyrithione, piroctone olamine, azoxystrobin, sulfur, salicylic acid, and combinations.

[0053] a. Pyridinethione salts In certain embodiments, the antidandruff agent may be pyridinethione particles, such as 1-hydroxy-2-pyridinethione salts. The concentration of pyridinethione antidandruff particles may range from about 0.1% to about 4%, about 0.1% to about 3%, about 0.1% to about 2%, and about 0.3% to about 2% by weight of the composition. Suitable pyridinethione salts include those formed from heavy metals such as zinc, tin, cadmium, magnesium, aluminum, and zirconium; zinc salts of 1-hydroxy-2-pyridinethione (known as "zinc pyridinethione" or "ZPT"); or 1-hydroxy-2-pyridinethione salts in the form of tabular particles having an average particle size of about 20 microns or less, alternatively about 5 microns or less, or even about 2.5 microns or less. Salts formed from other cations, such as sodium, may also be suitable. Pyridinethione antidandruff agents are further described in U.S. Patent Nos. 2,809,971, 3,236,733, 3,753,196, 3,761,418, 4,345,080, 4,323,683, 4,379,753, and 4,470,982, each of which is incorporated herein by reference. When ZPT is used as an antidandruff particle, it is believed that hair growth or regrowth may be stimulated or regulated, or both, or hair loss may be reduced or inhibited, or hair may appear thicker or fuller.

[0054] b. Other antibacterial active substances In addition to the anti-dandruff active selected from polyvalent metal salts of pyrithione, the personal care composition may further comprise one or more antifungal or antibacterial actives in addition to the metal pyrithione salt active. Suitable antibacterial actives include coal tar, sulfur, Whitfield's ointment, Castellani's liniment, aluminum chloride, gentian violet, octopirox (piroctone olamine), ciclopirox olamine, undecylenic acid and its metal salts, potassium permanganate, selenium sulfide, sodium thiosulfate, propylene glycol, bitter orange oil, urea , griseofulvin, 8-hydroxyquinoline , clioquinol, thiobendazole, thiocarbamate, haloprogin, polyenes Antifungal agents , hydroxypyridone, morpholine, benzylamine, allylamine (e.g., terbinafine), tea tree oil, clove leaf oil, coriander oil , Palmarosa oil , berberine, thyme red, cinnamon oil, cinnamaldehyde, citronellic acid, Hinokitiol (hinokitol), ichthyol pale (Ictasol) , Sensiva SC-50 (Ethylhexylglycerin) , Elestab HP-100 (Hexamidine diisethionate) Suitable antibacterial agents include itraconazole, ketoconazole, selenium sulfide, and coal tar.

[0055] C. Azoxystrobin The personal care composition may include from about 0.02% to about 10% azoxystrobin, from about 0.05% to about 2% azoxystrobin, from about 0.1% to about 1% azoxystrobin.

[0056] d. Piroctone olamine Piroctone olamine can be used as an antibacterial / anti-dandruff agent. Effective concentrations of piroctone olamine are typically about 0.1% to about 2% by weight.

[0057] e. Salicylic acid Salicylic acid can be used as an antibacterial / anti-dandruff agent. Effective concentrations of salicylic acid are typically from about 0.1% to about 10% by weight.

[0058] f. Azole In certain embodiments, a suitable antibacterial agent may be an azole. Examples of azole antibacterial agents may include imidazoles such as benzimidazoles, benzothiazoles, bifonazole, butaconazole nitrate, climbazole, clotrimazole, cloconazole, eberconazole, econazole, elubiol, fenticonazole, fluconazole, flutimazole, isoconazole, ketoconazole, lanoconazole, metronidazole, miconazole, neticonazole, omoconazole, oxiconazole nitrate, sertaconazole, sulconazole nitrate, tioconazole, thiazoles, and triazoles such as terconazole and itraconazole, and combinations thereof. When present in personal care compositions, the azole antibacterial active may be present in an amount of from about 0.01% to about 5%, from about 0.1% to about 3%, or even from about 0.3% to about 2% by weight of the composition.

[0059] g. Selenium sulfide Selenium sulfide is a suitable particulate anti-dandruff agent for use in antimicrobial compositions when included at concentrations of about 0.1% to about 4%, about 0.3% to about 2.5%, and about 0.5% to about 1.5% by weight of the composition. Selenium sulfide is generally considered to be a compound having one mole of selenium and two moles of sulfur, but has the general formula Se x S y where x+y=8. The average particle size of selenium sulfide is typically less than 15 μm, alternatively less than 10 μm, as measured by forward laser light scattering (e.g., a Malvern 3600 instrument). Selenium sulfide compounds are described, for example, in U.S. Pat. Nos. 2,694,668, 3,152,046, 4,089,945, and 4,885,107, each of which is incorporated herein by reference.

[0060] h.Sulfur In certain embodiments, sulfur may be used as a particulate antimicrobial / anti-dandruff agent. Effective concentrations of particulate sulfur are typically from about 0.1% to about 5%, from about 1% to about 4%, and from about 2% to about 4% by weight.

[0061] k.Other Additional antimicrobial actives may include extracts of melaleuca (tea tree) and charcoal. As can be appreciated, the personal care compositions may also include combinations of antimicrobial actives. Suitable combinations may include octopirox and zinc pyrithione, pine tar and sulfur, salicylic acid and zinc pyrithione, octopirox and climbazole, and salicylic acid and octopirox, as well as mixtures thereof.

[0062] moisturizer The personal care composition may contain a humectant to reduce the rate of water evaporation. Suitable humectants include polyhydric alcohols, water-soluble alkoxylated nonionic polymers, and mixtures thereof. When included, the humectant may be used at a concentration of from about 0.1% to about 20% and from about 0.5% to about 5% by weight of the composition.

[0063] Suitable polyhydric alcohols include glycerin, sorbitol, propylene glycol, butylene glycol, hexylene glycol, ethoxylated glucose, 1,2-hexanediol, hexanetriol, dipropylene glycol, erythritol, trehalose, diglycerin, xylitol, maltitol, maltose, glucose, fructose, sodium chondroitin sulfate, sodium hyaluronate, sodium adenosine phosphate, sodium lactate, pyrrolidone carbonate, glucosamine, cyclodextrin, and mixtures thereof.

[0064] Suitable water-soluble alkoxylated nonionic polymers include polyethylene glycols and polypropylene glycols having a molecular weight of about 1,000 or less, such as those having the CTFA designations PEG-200, PEG-400, PEG-600, PEG-1000, and mixtures thereof.

[0065] Other optional ingredients As can be understood, the personal care composition may further comprise optional ingredients. For example, amino acids may be included. Suitable amino acids may include, for example, water-soluble vitamins such as vitamin B1, B2, B6, B12, C, pantothenic acid, pantothenyl ethyl ether, panthenol, biotin, and derivatives thereof; water-soluble amino acids such as asparagine, alanine, indole, glutamic acid, and salts thereof; water-insoluble vitamins such as vitamin A, D, E, and derivatives thereof; water-insoluble amino acids such as tyrosine, tryptamine, and salts thereof.

[0066] In certain embodiments, the personal care composition may optionally contain color materials such as inorganic, nitroso, monoazo, disazo, carotenoid, triphenylmethane, triarylmethane, xanthene, quinoline, oxazine, azine, anthraquinone, indigoid, thionindigoid, quinacridone, phthalocyanine, plant dyes, natural dyes, etc., including water-soluble components such as those having a Color Index Name (CI Name). The composition may also contain antimicrobial agents useful as cosmetic biocides and antidandruff agents, including water-soluble components such as piroctone olamine, water-insoluble components such as 3,4,4'-trichlorocarbanilide (triclosan), triclocarban, and zinc pyrithione.

[0067] In certain embodiments, one or more stabilizers and preservatives may be included. For example, to improve the shelf life of the personal care composition, one or more of trihydroxystearin, ethylene glycol distearate, citric acid, sodium citrate dihydrate, preservatives such as kathon, sodium chloride, sodium benzoate, sodium salicylate, and ethylenediaminetetraacetic acid (EDTA) may be included. The stabilizers and / or preservatives may be used at levels of about 0.10% to about 2% by weight. Sodium benzoate at levels of about 0.10% to about 0.45% by weight is particularly suitable. The personal care composition may also include citric acid at levels of about 0.5% to about 2% by weight. Sodium benzoate and citric acid may be added to the personal care composition alone or in combination.

[0068] Chelating agents may also be included to capture metals and reduce hair damage caused by exposure to UV rays. Examples of suitable chelating agents include histidine and N,N' ethylenediaminenicoccinic acid ("EDDS").

[0069] A fragrance may be included, which may be an essential oil.

[0070] How to use The personal care compositions described herein can be used in a conventional manner to cleanse and condition hair or skin. Generally, hair or skin treatment methods can include applying the personal care composition to the hair or skin. For example, an effective amount of the personal care composition can be applied to hair or skin that has been wetted with water, and the composition can then be rinsed off. Generally, the effective amount can range from about 1 g to about 50 g in certain embodiments, and from about 1 g to about 20 g in certain embodiments. Application to hair typically involves working the composition through the hair so that most or all of the hair comes into contact with the composition.

[0071] In certain embodiments, a method of treating hair or skin may include the steps of: (a) wetting the hair or skin with water; (b) applying an effective amount of a personal care composition to the hair or skin; and (c) rinsing the applied skin or hair area with water. These steps can be repeated as many times as desired to achieve the desired cleansing and conditioning benefits.

[0072] In certain embodiments, the personal care compositions described herein may be used to treat damaged hair, which may include permed hair, oxidatively dyed hair, and mechanically damaged hair.

[0073] The personal care compositions can be used as liquids, solids, semi-solids, flakes, gels in pressurized containers with added propellants, or in the form of pump-action sprays. The viscosity of the product can be selected to correspond to the desired form.

[0074] Test Method Preparation of Exemplary Cleaning Compositions An exemplary cleaning composition is prepared by mixing a surfactant, a surfactant-soluble active, and the remaining water with sufficient agitation to ensure a homogeneous mixture. The mixture may be heated to 40-70°C to accelerate solubilization of the surfactant-soluble active, and then cooled. The pH of the product is then adjusted as needed to provide a composition of about 5 to about 6.

[0075] method pH A Thermo Scientific Orion Star A321 pH meter was utilized. Calibration should be performed prior to pH analysis. After calibration, pH measurements are taken on the fished product until the desired pH value is obtained.

[0076] Stability evaluation Stability can be assessed by placing shampoo samples in a temperature-controlled room at 40°C. Visual changes in physical properties over time are assessed by observed phase separation or precipitation. A "yes" or "no" result is given for samples placed within stability conditions for up to one month. A "yes" result means the product is phase stable and does not show any visible signs of phase instability characteristics, including creaming, precipitation, tunneling, separation, or settling. A "no" result means there are visible signs of creaming, precipitation, tunneling, phase separation, or settling that occurred during the first month of stability evaluation.

[0077] Rheological measurements The low shear yield stress is determined using a Trios rheometer at 26.7°C using a 60 mm 2.005 degree cone plate and Peltier aluminum plate. The sample gap is set to 52 μm. The sample is tested through a logarithmic sweep from 10 to 1.0e-4 1 / S. Analysis of the shear stress (Pa) curve from 10e-4 to 10e-2 is performed by Herschel Bulkley analysis to determine the low shear yield stress in Pascals (Pa).

[0078] Viscosity measurement The viscosity of the shampoo was measured using a cone-plate Brookfield RS rheometer equipped with cone C75-1 at 2 s -1 Measurements can be performed on 2.5 mL samples at a constant shear rate of 100 MPa, 27°C, and 3 minutes.

[0079] Conditioning (combing, rubbing and combing) The conditioning provided by oil-added formula shampoos was measured using hair that had not previously been exposed to chemical treatments such as coloring or perms. Tresses (4 g, 8 inches) were washed for three cycles and combing force was measured using an Instron. Combing friction was measured as the force required to run the comb through the entire length of the hair, and detangling was measured as the force required to run the comb through the tips of the hair.

[0080] Less force corresponds to more conditioning and less breakage. All shampoos containing triglyceride oils exhibit significantly lower combing force than oil-free shampoos, approaching the conditioning performance of dimethicone. The compositions of these four oils cover the range of triglycerides typically found in natural oils, ranging from coconut oil, which contains primarily short-chain saturated triglycerides (fatty acid chain lengths of C10, C12), to safflower seed oil and argan oil, which contain primarily triglycerides with C18 fatty acids with one or two double bonds, and meadowfoam seed oil, which contains longer-chain unsaturated fatty acids (C20-C22).

[0081] Jojoba seed oil does not contain triglycerides, and 80% of the oil is a straight-chain ester with 40-42 carbon atoms. It exhibits lower detangling power than the oil-free control shampoo, but not as low as the triglyceride oil, and no measurable combing benefit is observed.

[0082] Cross-polarized light microscopy / optical microscopy Samples were examined by DIC and cross-polarized transmitted light microscopy using various objectives. A 40x objective was used for the included images. 40x optical microscope images taken with microscope settings: condenser setting II, Wallaston Filter in, and DIC transmitted light at Turret setting 2.

[0083] pH A Thermo Scientific Orion Star A321 pH meter was utilized. Calibration should be performed prior to pH analysis. After calibration, pH measurements are taken on the fished product until the desired pH value is obtained.

[0084] Non-limiting examples The personal care compositions shown in the following examples illustrate specific embodiments of the personal care compositions described herein, but are not intended to be limiting. Other modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention. These exemplified embodiments of the personal care compositions provide suitable cleansing benefits to hair without the use of harsh sulfate-based surfactants.

[0085] The personal care compositions illustrated in the following examples were prepared by conventional formulation and mixing methods, examples of which are described below. Unless otherwise noted, all exemplified amounts are listed as weight percent and exclude minor materials such as diluents, preservatives, color solutions, image ingredients, botanicals, etc. All percentages are by weight unless otherwise specified.

[0086] The combination of ingredients, including sulfate-free sodium cocoyl alanine surfactant and glyceryl caprylate caprate, stably suspends high levels of conditioning oils in the formulation. These oils provided reduced hair surface friction that was equal to or significantly better than silicone-containing formulations or no oil.

[0087] [Table 1]

[0088] [Table 2]

[0089] [Table 3]

[0090] [Table 4]

[0091] [Table 5]

[0092] [Table 6]

[0093] [Table 7] * Significant vs. oil-free control at >95% confidence level (Student's t-test)

[0094] combination: 1. A personal care composition comprising: a) about 9% to about 16% by weight of an anionic surfactant; b) about 3% to about 10% by weight, preferably 5% to 6% by weight, of glyceryl esters; c) about 0.2% to about 6% by weight, preferably 0.5% to 5% by weight, of triglyceride oil; ) a liquid carrier; and and is substantially free of sulfated surfactants, and has a pH of about 4.5 to about 6, preferably 4.5 to 5.5, more preferably 5 to 6, and a yield stress of about 0.5 to about 10 Pa, preferably 1 to 10. 2. Pyridinethione salts, preferably zinc pyrithione, azoles, selenium sulfide, particulate sulfur, coal tar, sulfur, Whitfield's ointment, Castellani liniment, aluminum chloride, gentian violet, piroctone olamine, ciclopirox olamine, undecylenic acid and its metal salts, potassium permanganate, selenium sulfide, sodium thiosulfate, propylene glycol, orange peel oil, urea preparations, griseofulvin, 8-hydroxyquinoline citric acid, thiobendazole, thiocarbamate, haloprogin, polyenes, hydroxypyridone, morpholine, benzylamine, allylamines (terbinafine, etc.), tea tree oil, clove leaf oil, coriander, palmarosa, berberine, thyme red, cinnamon bark oil, cinnamaldehyde, citronellic acid, hinoki tol, ichthyol pale, Sensiva 10. The personal care composition of paragraph 1, further comprising an anti-dandruff agent selected from SC-50, Elestab HP-100, azelaic acid, lyticase, iodopropynyl butylcarbamate (IPBC), isothiazarinones such as octylisothiazarinone, and azoles, azoxystrobin, and combinations thereof. 3. The personal care composition of paragraph 1 or 2, wherein the amino acid surfactant is selected from sodium cocoyl alaninate, sodium cocoyl glycinate, sodium lauroyl glycinate, sodium cocoyl sarcosinate, sodium lauroyl sarcosinate, disodium cocoyl glutamate, sodium lauroyl glutamate. 4. The personal care composition of any of paragraphs 1-3, wherein the glyceryl ester is glyceryl caprate, glyceryl caprylate, and mixtures thereof, preferably (caprylic / capric) glyceryl esters substantially free of polyethylene glycol (PEG), ethylene oxide / propylene oxide (EO / PO), nitrogen, and mixtures thereof. 5. The personal care composition of any of paragraphs 1-4, wherein the glyceryl ester is caprylic / capric glyceryl, preferably the caprylic / capric glyceryl is substantially free of PEG, EO / PO, nitrogen, and mixtures thereof. 6. The personal care composition of any of paragraphs 1-5, further comprising about 0.01% to about 5% by weight of a zwitterionic surfactant. 7. The personal care composition of any of paragraphs 1-6, further comprising about 0.1% to about 2.5% by weight of lauric acid. 8. The personal care composition of any of paragraphs 1 to 7, wherein the composition is stable at both 8.5°C and 40°C. 9. The personal care composition of any of paragraphs 1 to 8, further comprising a cationic deposition polymer, preferably a cationic polymer selected from guar derivatives and cellulose derivatives. 10. The personal care composition of paragraph 9, wherein the cationic deposition polymer has a charge density of from about 0.7 to about 2.0 meq / g and a weight average molecular weight of from about 500,000 to about 2,000,000. 11. The personal care composition of any of paragraphs 1-10, comprising less than about 3% by weight, preferably less than 2% inorganic salts. 12. The personal care composition of any of paragraphs 1-11, further comprising about 7% to about 15%, preferably 9% to 12%, by weight of sodium cocoyl alanine. 13. The personal care composition of any of paragraphs 1 to 12, which is a shampoo. 14. The personal care composition of any one of paragraphs 1-13, wherein the composition is substantially free of silicones. 15. The personal care composition of any of paragraphs 1-14, comprising from about 0.01 to about 0.45% by weight of sodium benzoate. 16. The personal care composition of any of paragraphs 1-15, comprising about 0.5 to about 2% by weight of citric acid. 17. The amino acid surfactant is selected from sodium cocoyl alaninate, sodium cocoyl glycinate, sodium lauroyl glycinate, sodium cocoyl sarcosinate, sodium lauroyl sarcosinate, disodium cocoyl glutamate, and sodium lauroyl glutamate, and the amino acid surfactant is selected from potassium cocoyl glycinate, potassium lauroyl glycinate, potassium lauroyl sarcosinate, potassium lauroyl glutamate, potassium lauroyl alaninate, potassium cocoyl alaninate, sodium cocoyl methyl β-alanine, sodium myristoyl methyl β-alanine, potassium lauroyl methyl β-alanine, sodium cocoyl (arginine / aspartic acid / glutamic acid / isoleucine / leucine / lysine / phenylalanine / proline / serine / threonine / valine), sodium cocoyl / stearoyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / glutamine / glycine / histidine / isoleucine), sodium cocoyl ... Sodium leucine / lysine / phenylalanine / proline / serine / threonine / tyrosine / valine, behenoyl / cocoyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / glycine / isoleucine / leucine / lysine / methionine / phenylalanine / proline / serine / threonine / tryptophan / tyrosine / valine), sodium olivoyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / glycine / isoleucine) 17. The personal care composition of any of paragraphs 1 to 16, wherein the hydroxybenzoates are selected from the group consisting of potassium lauroyl / olivoyl (alanine / arginine / asparagine / aspartic acid / glutamic acid / lysine / isoleucine / leucine / lysine / methionine / phenylalanine / proline / serine / threonine / tryptophan / tyrosine / valine), ...). 18. Use of the personal care composition of any of paragraphs 1 to 17 for at least one of hair color retention, hair conditioning, hair moisturizing, and skin moisturizing. 19. A personal care composition consisting of water, sodium cocoyl alaninate, caprylic / capric glyceryl, a cationic polymer, sodium benzoate, citric acid, a triglyceride oil, and at least one additional ingredient selected from the group consisting of sodium chloride, a fragrance, a co-surfactant, and an anti-dandruff agent, wherein the total number of ingredients in the composition is 9 or less.

[0095] Dimensions and values ​​disclosed herein should not be understood as being strictly limited to the exact numerical values ​​recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm."

[0096] All documents cited herein, including any cross-referenced or related patents or patent applications, and any patent application or patent to which this application claims priority or benefit, are incorporated herein by reference in their entirety, unless expressly stated to the contrary. The citation of any document shall not be deemed to be prior art to any invention disclosed or claimed herein, or to teach, suggest, or disclose any such invention, either alone or in combination with any other reference or references. Furthermore, to the extent that any meaning or definition of a term in this document 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 document shall govern.

[0097] While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims

1. A personal care composition for cleansing and conditioning hair or skin, comprising: a) 9% to 16% by weight of an amino acid surfactant, wherein the amino acid surfactant is a coconut fatty acid derived surfactant; b) 3% to 10% by weight of a glyceryl ester, the glyceryl ester being glyceryl caprate, glyceryl caprylate, or a mixture thereof; c) 0.2% to 6% by weight of a triglyceride oil; and a pH of 4.5 to 5.5 and a yield stress of 0.5 to 10 Pa.

2. Pyridinethione salts, zinc pyrithione, azole antifungal agents, selenium sulfide, particulate sulfur, coal tar, sulfur, Whitfield's ointment, Castellani liniment, aluminum chloride, gentian violet, piroctone olamine, ciclopirox olamine, undecylenic acid and its metal salts, potassium permanganate, selenium sulfide 10. The personal care composition of claim 1, further comprising an antidandruff agent selected from the group consisting of: hydroxybenzoates, hydroxybenzoates (hydroxybenzoates), benzoyl ...

3. 10. The personal care composition of claim 1, wherein the glyceryl ester is a (caprylic / capric) glyceryl ester substantially free of polyethylene glycol (PEG), ethylene oxide / propylene oxide (EO / PO), nitrogen, dioxane, or combinations thereof in its structure.

4. 10. The personal care composition of claim 1, further comprising from 0.01% to 5% by weight of a zwitterionic surfactant.

5. 10. The personal care composition of claim 1, which is stable at 40°C when evaluated according to the stability test described herein.

6. 10. The personal care composition of claim 1, further comprising a cationic deposition polymer.

7. 7. The personal care composition of claim 6, wherein the cationic deposition polymer is selected from a guar derivative, a cellulose derivative, or a mixture thereof.

8. 7. The personal care composition of claim 6, wherein the cationic deposition polymer has a charge density of 0.7 to 2.0 meq / g and a weight average molecular weight of 500,000 to 2,000,000.

9. 10. The personal care composition of claim 1 comprising less than 3% by weight of inorganic salts.

10. 10. The personal care composition of claim 1, wherein the amino acid surfactant comprises 7% to 15% by weight of sodium cocoyl alanine, based on the total weight of the personal care composition.

11. 10. The personal care composition of claim 1, which is substantially free of silicones.

12. 10. The personal care composition of claim 1 comprising 0.10 to 0.45% by weight of sodium benzoate.

13. 10. The personal care composition of claim 1 comprising from 0.5 to less than 2% by weight of citric acid.

14. 1. A personal care composition for cleansing and conditioning hair or skin, comprising: water, 9% to 16% by weight of sodium cocoyl alaninate, 3% to 10% by weight of caprylic / capric glyceryl, 0.1% to 3% by weight of a cationic polymer, 0.10% to 0.45% by weight of sodium benzoate, 0.5% to 2% by weight of citric acid, 0.2% to 6% by weight of a triglyceride oil, and at least one additional ingredient of up to two of sodium chloride, a fragrance, a zwitterionic surfactant, and an anti-dandruff agent; and having a pH of 4.5 to 5.5 and a yield stress of 0.5 to 10 Pa.

Images