Method for preparing shelf-stable sulfur-containing personal care compositions

Abstract

The present invention relates to a method for preparing a personal care composition comprising sulfur, the method comprising the steps of: a) providing a composition comprising a surfactant, a stabilizer, and water, the composition comprising at least about 3.0% surfactant and sufficient stabilizer to build up a yield stress of at least 0.06 Pa; and b) mixing the composition in step (a), the agitator tip speed being between about 1.5 m / s and about 2.7 m / s with a recirculation turnover rate of greater than 1.8 turnovers / hour, the agitator tip speed being greater than {agitator circumference [m / revolutions]}. * {agitator rotation speed [rev / s]} and the recirculation turnover rate is calculated by {recirculation pump speed [L / hr]} / {total turnover volume [L / turnover]}; and c) adding sulfur to the composition of step (b), maintaining the conditions of step (b) during the addition of sulfur and until the personal care composition is prepared.

Description

[Technical field]

[0001] The present invention relates to the preparation of shelf-stable personal care compositions containing sulfur. [Background technology]

[0002] Traditionally, large hydrophobic particulates actively attempt to separate from the aqueous personal care composition environment by either gravity separation and / or hydrophobic repulsion from the aqueous environment itself. To achieve shelf stability, personal care compositions containing such particles typically add them at very low concentrations (<0.1%) to minimize these effects by increasing product rheology (>20,000 cPs at 2s^-1) and "sticking" the particulates in place, and / or create trade-offs, which can lead to inhomogeneity in the final formulation without excessive mixing, which itself can create instability. Such design and manufacturing techniques can create undesirable manufacturing conditions, such as manufacturing conditions that are too thick to dispense or too expensive to process, and when using sulfur particulates (D50-30um) to treat dandruff, these trade-offs are simply not acceptable and the product shelf life is undistributable, thereby making these classical techniques unsuitable for their construction and requiring improvement. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention has found an operating sequence that prioritizes the formulation's yield stress building by including a stability promoter early before sulfur addition, and a separate mixing speed (as defined by tip speed) and then a separate recirculation speed (as defined by turnover) (a balance between homogenization and stabilization) has resulted in the production of a shelf-stable sulfur-containing anti-dandruff shampoo. The degree to which this control is maintained is unexpected given the similarity of the materials to other anti-dandruff shampoos that use different anti-dandruff actives but have other similar compositions that do not require these considerations. The benefits of each of these conditions can be demonstrated in the present invention. [Means for solving the problem]

[0004] The present invention relates to a method for preparing a personal care composition comprising sulfur, the method comprising the steps of: a) providing a composition comprising a surfactant, a stabilizer, and water, the composition comprising at least about 3.0% surfactant and sufficient stabilizer to build up a yield stress of at least 0.06 Pa; and b) mixing the composition in step (a), the agitator tip speed being between about 1.5 m / s and about 2.7 m / s with a recirculation turnover rate of greater than 1.8 turnovers / hour, the agitator tip speed being greater than {agitator circumference [m / revolutions]}. * {agitator rotation speed [rev / s]} and the recirculation turnover rate is calculated by {recirculation pump speed [L / hr]} / {total turnover volume [L / turnover]}; and c) adding sulfur to the composition of step (b), maintaining the conditions of step (b) during the addition of sulfur and until the personal care composition is prepared. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a schematic diagram of a multi-tank process, including a premix tank and a tank, for preparing a personal care composition containing sulfur. [Diagram 2]FIG. 1 is a schematic diagram of a single tank process for preparing a personal care composition containing sulfur. [Diagram 3] Two photographs showing examples of untrapped sulfur remaining in the tank. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] Unless otherwise specified, all percentages and ratios used herein are based on the weight of the total composition.Unless otherwise specified, it is understood that all measurements are performed at ambient conditions, where "ambient conditions" means conditions at about 25°C, under about 1 atmosphere, and at about 50% relative humidity.All numerical ranges include narrower ranges.The upper and lower range limits described are combinable to create additional ranges not expressly described.

[0007] The compositions of the present invention can comprise, consist essentially of, or consist of the essential and optional components described herein. As used herein, "consisting essentially of" means that the composition or component may include additional components, but only if the additional components do not materially alter the basic and novel characteristics of the claimed composition or method.

[0008] "Apply" or "application" as used in reference to a composition means applying or spreading the composition of the present invention onto keratinous tissue, such as hair.

[0009] By "dermatologically acceptable" it is meant that the composition or components being described are suitable for use in contact with human skin tissue without undue toxicity, incompatibility, instability, allergic response, and the like.

[0010] By "safe and effective amount" is meant an amount of a compound or composition sufficient to significantly induce a beneficial effect.

[0011] While the specification concludes with claims particularly pointing out and distinctly claiming the invention, it is believed the present invention will be better understood from the following description.

[0012] As used herein, the term "fluid" includes liquids and gels.

[0013] As used herein, the articles including "a" and "an," when used in a claim, are understood to mean one or more of what is claimed or described.

[0014] As used herein, "comprising" means that other steps and other ingredients that do not affect the end result can be added. This term encompasses the terms "consisting of" and "consisting essentially of."

[0015] As used herein, "mixtures" are meant to include simple combinations of materials and any compounds that may result from those combinations.

[0016] As used herein, "molecular weight" refers to weight average molecular weight, unless otherwise specified. Molecular weight is measured using gel permeation chromatography (GPC), an industry standard method.

[0017] When amount ranges are listed, they should be understood to be the total amount of that ingredient in the composition, or, if more than one ingredient definition falls within the range, the total amount of all ingredients fitting that definition in the composition.

[0018] For example, if a composition contains 1%-5% fatty alcohols, a composition containing 2% stearyl alcohol and 1% cetyl alcohol, and no other fatty alcohols, would fall within this range.

[0019] The amount of each specific ingredient, or mixtures thereof, described below may account for up to (or including) 100% of the total amount of the ingredient or ingredients in the hair care composition.

[0020] As used herein, "personal care compositions" include products such as shampoos, shower gels, liquid hand washes, hair dyes, facial cleansers, and other surfactant-based liquid compositions.

[0021] As used herein, the terms "include", "includes", and "including" are meant to be open-ended and are understood to mean "comprise", "comprises", and "comprising", respectively.

[0022] All percentages, parts and ratios are based on the total weight of the compositions of the present invention unless otherwise specified. All such weights as they pertain to listed ingredients are based on the active level and, therefore, do not include carriers or by-products that may be included in commercially available materials.

[0023] Unless otherwise noted, all component or composition concentrations are in terms of the active portion of that component or composition and are exclusive of impurities, e.g., residual solvents or by-products, that may be present in commercial sources of such component or composition.

[0024] It should be understood that every maximum numerical limitation given throughout this specification includes every lower numerical limitation, as if such lower numerical limitations were expressly written herein. Every minimum numerical limitation given throughout this specification includes every higher numerical limitation, as if such higher numerical limitations were expressly written herein. Every numerical range given throughout this specification includes every narrower numerical range that falls within such broader numerical range, as if such narrower numerical ranges were all expressly written herein.

[0025] sulfur The personal care compositions of the present invention may include sulfur. Sulfur suitable for use herein may be any form of elemental sulfur. Sulfur exists primarily as orthorhombic crystals at room temperature. The two most common methods of obtaining elemental sulfur include precipitation from hydrogen sulfide, which arises from contaminants in sour gas, in one route, by the Claus process, and mining underground deposits using superheated water, known as the flash process. Other forms of sulfur, such as monoclinic crystalline sulfur, oligomeric sulfur, or polymeric sulfur, are the usual primary forms that elemental sulfur takes at certain high temperature ranges. At room temperature, these forms convert or revert to orthorhombic sulfur. The elemental form of sulfur may be sulfur physically mixed with protective colloids such as gum arabic, clays, waxes, oils, activated carbon, zeolites, silica, or dispersing agents such as surfactants, or sulfur that has undergone processing steps that modify its particle size and other physical properties. Sulfur is commercially available in a variety of forms, including pellets, cakes, prills, colloidal, micronized, sublimated, precipitated, and commercially available powders.

[0026] The sulfur may have a particle size distribution with 90% of the particles (D90) between about 30 micrometers (μm) and about 250 micrometers (μm). The sulfur may have a particle size distribution with a D90 between about 30 micrometers (μm) and about 200 micrometers (μm). The sulfur may have a particle size distribution with a D90 between about 30 micrometers (μm) and about 150 micrometers (μm). The sulfur may have a particle size distribution with a D90 between about 30 micrometers (μm) and about 100 micrometers (μm).

[0027] The sulfur may have a particle size distribution with 50% of the particles (D50) between about 5 micrometers (μm) and about 150 micrometers (μm). The sulfur may have a particle size distribution with a D50 between about 10 micrometers (μm) and about 100 micrometers (μm). The sulfur may have a particle size distribution with a D50 between about 15 micrometers (μm) and about 75 micrometers (μm). The sulfur may have a particle size distribution with a D50 between about 20 micrometers (μm) and about 50 micrometers (μm).

[0028] The sulfur may have a particle size distribution with 10% of the particles (D10) between about 1 micrometer (μm) and about 25 micrometers (μm). The sulfur may have a particle size distribution with D10 between about 5 micrometers (μm) and about 25 micrometers (μm). The sulfur may have a particle size distribution with D10 between about 10 micrometers (μm) and about 25 micrometers (μm). The sulfur may have a particle size distribution with D10 between about 18 micrometers (μm) and about 25 micrometers (μm).

[0029] Sulfur may be present in a D(90) / D(10) ratio of about 3 to about 100. Sulfur may be present in a D(90) / D(10) ratio of about 3 to about 50. Sulfur may be present in a D(90) / D(10) ratio of about 3 to about 10. Sulfur may be present in a D(90) / D(10) ratio of about 3 to about 4.

[0030] Sulfur may be present in the final composition in an amount of about 0.1% to 5%, about 0.25% to 4%, about 0.5% to about 3%, about 0.5% to 2%. Sulfur may be present in the premix in an amount of about 2% to about 60%, about 25% to about 60%, and about 40% to about 55%.

[0031] Detergent Surfactants The personal care composition may comprise greater than about 10% by weight of a surfactant system that provides cleaning performance to the composition, and may comprise greater than 12% by weight of a surfactant system that provides cleaning performance to the composition. The surfactant system comprises an anionic surfactant, and / or a combination of an anionic surfactant, and / or a combination of an anionic surfactant with a co-surfactant selected from the group consisting of amphoteric, zwitterionic, nonionic, and mixtures thereof. Various examples and descriptions of detersive surfactants are described in U.S. Patent No. 8,440,605, U.S. Patent Application Publication No. 2009 / 155383, and U.S. Patent Application Publication No. 2009 / 0221463, which are incorporated herein by reference in their entireties.

[0032] The personal care composition may comprise from about 10% to about 25%, from about 10% to about 18%, from about 10% to about 14%, from about 10% to about 12%, from about 11% to about 20%, from about 12% to about 20%, and / or from about 12% to about 18% by weight of one or more surfactants. The premix composition may comprise from about 3% to about 20%, or from about 3% to about 9% by weight of one or more surfactants.

[0033] Suitable anionic surfactants for use in the composition are alkyl and alkyl ether sulfates.Other suitable anionic surfactants are the water-soluble salts of organic sulfuric acid reaction products.Still other suitable anionic surfactants are the reaction products of fatty acids esterified with isethionic acid and neutralized with sodium hydroxide.Other similar anionic surfactants are described in U.S. Patent Nos. 2,486,921, 2,486,922, and 2,396,278, which are incorporated herein by reference in their entirety.

[0034] Exemplary anionic surfactants for use in hair care compositions include ammonium lauryl sulfate, ammonium laureth sulfate, ammonium C10-15 pareth sulfate, ammonium C10-15 alkyl sulfate, ammonium C11-15 alkyl sulfate, ammonium decyl sulfate, ammonium deceth sulfate, ammonium undecyl sulfate, ammonium undeceth sulfate, triethylamine lauryl sulfate, triethylamine laureth sulfate, triethanolamine lauryl sulfate, triethanolamine laureth sulfate, monoethanolamine lauryl sulfate, monoethanolamine laureth sulfate, diethanolamine lauryl sulfate, diethanolamine laureth sulfate, lauric acid monoglyceride sodium sulfate, sodium lauryl sulfate, sodium laureth sulfate, sodium C10-15 pareth sulfate, sodium C10-15 alkyl sulfate, sodium C11-15 alkyl sulfate, sodium decyl sulfate, sodium deceth sulfate, sodium The anionic surfactants include sodium undecyl sulfate, sodium undecyl sulfate, potassium lauryl sulfate, potassium laureth sulfate, C10-15 potassium pareth sulfate, C10-15 potassium alkyl sulfate, C11-15 potassium alkyl sulfate, potassium decyl sulfate, potassium decyl sulfate, potassium undecyl sulfate, potassium undecyl sulfate, sodium lauryl sarcosinate, sodium lauroyl sarcosinate, lauryl sarcosine, cocoyl sarcosine, ammonium cocoyl sulfate, ammonium lauroyl sulfate, sodium cocoyl sulfate, sodium lauroyl sulfate, potassium cocoyl sulfate, potassium lauryl sulfate, triethanolamine lauryl sulfate, triethanolamine lauryl sulfate, monoethanolamine cocoyl sulfate, monoethanolamine lauryl sulfate, sodium tridecylbenzenesulfonate, sodium dodecylbenzenesulfonate, sodium cocoyl isethionate, and combinations thereof. The anionic surfactant may be sodium lauryl sulfate or sodium laureth sulfate.

[0035] The composition of the present invention also comprises a) RO(CHCHR0) y SO3M, b) CH3(CH2)z CHR2CH2O(CH2CHR3O) y SO3M, and c) Mixtures of these [Wherein, R1 is CH3(CH2) 10 wherein R2 represents H or a hydrocarbon group containing 1 to 4 carbon atoms such that the sum of the carbon atoms in z and R2 is 8, R3 is H or CH3, y is 0 to 7, and when y is not zero (0), the average value of y is about 1, and M is a mono- or divalent positively charged cation.

[0036] Suitable anionic alkyl sulfate and alkyl ether sulfate surfactants include, but are not limited to, those having branched alkyl chains synthesized from C8-C18 branched alcohols which may be selected from the group consisting of Guerbet alcohols, aldol condensation derived alcohols, oxo alcohols, FT oxo alcohols and mixtures thereof. Non-limiting examples of 2-alkyl branched alcohols include 2-methyl-1-undecanol, 2-ethyl-1-decanol, 2-propyl-1-nonanol, 2-butyl-1-octanol, 2-methyl-1-dodecanol, 2-ethyl-1-undecanol, 2-propyl-1-decanol, 2-butyl-1-nonanol, 2-pentyl-1-octanol, 2-pentyl-1-heptanol, and those sold under the trade names LIAL® (Sasol), ISALCHEM. (Sasol), and NEODOL® (Shell), as well as Guerbet and aldol condensation derived alcohols such as 2-ethyl-1-hexanol, 2-propyl-1-butanol, 2-butyl-1-octanol, 2-butyl-1-decanol, 2-pentyl-1-nonanol, 2-hexyl-1-octanol, 2-hexyl-1-decanol, and those sold under the trade name ISOFOL® (Sasol), or as alcohol ethoxylates and alkoxylates under the trade names LUTENSOL XP® (BASF) and LUTENSOL XL® (BASF).

[0037] Anionic alkyl sulfates and alkyl ether sulfates can also include those synthesized from C8-C18 branched alcohols derived from butylene or propylene sold under the trade names EXXAL™ (Exxon) and Marlipal® (Sasol). This includes the subclass of anionic surfactants, sodium trideceth-n sulfate (STnS), where n is from about 0.5 to about 3.5. Exemplary surfactants of this subclass are sodium trideceth-2 sulfate and sodium trideceth-3 sulfate. The compositions of the present invention can also include sodium tridecyl sulfate.

[0038] The compositions of the present invention may also include anionic alkyl and alkyl ether sulfosuccinates and / or dialkyl and dialkyl ether sulfosuccinates and mixtures thereof. The dialkyl and dialkyl ether sulfosuccinates may be C6-15 linear or branched dialkyl or dialkyl ether sulfosuccinates. The alkyl moieties may be symmetrical (i.e., the same alkyl moieties) or asymmetrical (i.e., different alkyl moieties). Non-limiting examples include disodium lauryl sulfosuccinate, disodium laureth sulfosuccinate, sodium bistridecyl sulfosuccinate, sodium dioctyl sulfosuccinate, sodium dihexyl sulfosuccinate, sodium dicyclohexyl sulfosuccinate, sodium diamyl sulfosuccinate, sodium diisobutyl sulfosuccinate, linear bis(tridecyl) sulfosuccinate and mixtures thereof.

[0039] Suitable surfactants that are substantially free of sulfate include the sodium, ammonium, or potassium salts of isethionates; the sodium, ammonium, or potassium salts of sulfonates; the sodium, ammonium, or potassium salts of ether sulfonates; the sodium, ammonium, or potassium salts of sulfosuccinates; the sodium, ammonium, or potassium salts of sulfoacetates; the sodium, ammonium, or potassium salts of glycinates; the sodium, ammonium, or potassium salts of sarcosinates; the sodium, ammonium, or potassium salts of glutamates; the sodium, ammonium, or potassium salts of alaninates; the sodium, ammonium, or potassium salts of carboxylates; the sodium, ammonium, or potassium salts of taurates; the sodium, ammonium, or potassium salts of phosphate esters; and combinations thereof.

[0040] As used herein, "substantially free" of sulfate surfactants means from about 0% to about 3% by weight, alternatively from about 0% to about 2% by weight, alternatively from about 0% to about 1% by weight, alternatively from about 0% to about 0.5% by weight, alternatively from about 0% to about 0.25% by weight, alternatively from about 0% to about 0.1% by weight, alternatively from about 0% to about 0.05% by weight, alternatively from about 0% to about 0.01% by weight, alternatively from about 0% to about 0.001% by weight, and / or alternatively no sulfate. As used herein, "free" means 0% by weight.

[0041] The hair care composition may include a co-surfactant. The co-surfactant may be selected from the group consisting of amphoteric surfactants, zwitterionic surfactants, nonionic surfactants, and mixtures thereof. The co-surfactant may include, but is not limited to, lauramidopropyl betaine, cocamidopropyl betaine, lauryl hydroxysultaine, sodium lauroamphoacetate, disodium cocoamphodiacetate, cocamide monoethanolamide, and mixtures thereof.

[0042] The hair care composition may further comprise from about 0.25% to about 15%, from about 1% to about 14%, from about 2% to about 13% by weight of one or more amphoteric, zwitterionic, nonionic co-surfactants or mixtures thereof.

[0043] Suitable amphoteric or zwitterionic surfactants for use in the hair care compositions herein include those known for use in shampoos or other hair care cleansers. Non-limiting examples of suitable zwitterionic or amphoteric surfactants are described in U.S. Patent Nos. 5,104,646 and 5,106,609, which are incorporated herein by reference in their entireties.

[0044] Amphoteric co-surfactants suitable for use in the compositions include surfactants described as derivatives of aliphatic secondary and tertiary amines, in which the aliphatic groups can be linear or branched, one of the aliphatic substituents containing from about 8 to about 18 carbon atoms and one containing an anionic group such as a carboxy, sulfonate, sulfate, phosphate, or phosphonate. Suitable amphoteric surfactants include sodium cocaminopropionate, sodium cocaminodipropionate, sodium cocoamphoacetate, sodium cocoamphodiacetate, sodium cocoamphohydroxypropylsulfonate, sodium cocoamphopropionate, sodium cornamphopropionate, sodium lauraminopropionate, sodium lauroamphoacetate, sodium lauroamphodiacetate, sodium lauroamphohydroxypropylsulfonate, sodium lauroamphopropionate, sodium cornamphopropionate, sodium lauriminodipropionate, ammonium cocaminopropionate, ammonium cocaminodipropionate, ammonium cocoamphoacetate, ammonium cocoamphodiacetate, ammonium cocoamphohydroxypropylsulfonate, ammonium cocoamphopropionate, ammonium cornamphopropionate, ammonium lauraminopropionate, lauroamphoacetic acid Ammonium lauroamphodiacetate, ammonium lauroamphohydroxypropylsulfonate, ammonium lauroamphopropionate, ammonium corn amphopropionate, ammonium lauriminodipropionate, triethanolamine cocaminopropionate, triethanolamine cocaminodipropionate, triethanolamine cocoamphoacetate, triethanolamine cocoamphohydroxypropylsulfonate, triethanolamine cocoamphopropionate, triethanolamine corn amphopropionate, triethanolamine lauraminopropionate, triethanolamine lauroamphoacetate, triethanolamine lauroamphohydroxypropylsulfonate, triethanolamine lauroamphopropionate, triethanolamine corn amphopropionate, triethanolamine lauraminodipropionate, triethanolamine lauroamphoacetate, triethanolamine lauroamphohydroxypropylsulfonate, triethanolamine lauroamphopropionate, triethanolamine corn amphopropionate, triethanolamine lauraminodipropionate, cocoamphodipropionic acid, disodium caproamphodiacetate,Disodium caproamphodipropionate, disodium capryloamphodiacetate, disodium capryloamphodipriopionate, disodium cocoamphocarboxyethyl hydroxypropyl sulfonate, disodium cocoamphodiacetate, disodium cocoamphodipropionate, disodium dicarboxyethyl cocopropylenediamine, disodium laureth-5 carboxyamphodiacetate, disodium lauriminodipropionate, disodium lauroamphodiacetate, disodium lauroamphodipropionate, disodium oleoamphodipropionate, disodium PPG-2-isodecyl-7 carboxyamphodiacetate, disodium lauraminopropionic acid, lauroamphodipropionic acid, lauryl aminopropyl glycine, lauryl diethylenediaminoglycine, and mixtures thereof.

[0045] The compositions may also include zwitterionic co-surfactants, which are derivatives of aliphatic quaternary ammonium, phosphonium, and sulfonium compounds, in which the aliphatic groups may be linear or branched, and one of the aliphatic substituents contains from about 8 to about 18 carbon atoms and one contains an anionic group, such as a carboxy, sulfonate, sulfate, phosphate, or phosphonate. The zwitterionic surfactant may be selected from the group consisting of cocamidoethyl betaine, cocamidopropylamine oxide, cocamidopropyl betaine, cocamidopropyl dimethylamino hydroxypropyl hydrolyzed collagen, cocamidopropyl dimonium hydroxypropyl hydrolyzed collagen, cocamidopropyl hydroxysultaine, cocobetaine amide amphopropionate, coco-betaine, coco-hydroxysultaine, coco / oleamidopropyl betaine, coco-sultaine, lauramidopropyl betaine, lauryl betaine, lauryl hydroxysultaine, lauryl sultaine, and mixtures thereof.

[0046] Suitable nonionic surfactants for use in the present invention include those described in McCutcheion's Detergents and Emulsifiers, North American edition (1986), Allured Publishing Corp., and McCutcheion's Functional Materials, North American edition (1992). Suitable nonionic surfactants for use in the personal care compositions of the present invention include, but are not limited to, polyoxyethylenated alkylphenols, polyoxyethylenated alcohols, polyoxyethylenated polyoxypropylene glycols, glyceryl esters of alkanoic acids, polyglyceryl esters of alkanoic acids, propylene glycol esters of alkanoic acids, sorbitol esters of alkanoic acids, polyoxyethylenated sorbitol esters of alkanoic acids, polyoxyethylene glycol esters of alkanoic acids, polyoxyethylenated alkanoic acids, alkanolamides, N-alkylpyrrolidones, alkyl glycosides, alkyl polyglucosides, alkyl amine oxides, and polyoxyethylenated silicones.

[0047] The co-surfactant can be a non-ionic surfactant selected from the group of alkanolamides including cocamide, cocamide methyl MEA, cocamide DEA, cocamide MEA, cocamide MIPA, lauramide DEA, lauramide MEA, lauramide MIPA, myristamide DEA, myristamide MEA, PEG-20 cocamide MEA, PEG-2 cocamide, PEG-3 cocamide, PEG-4 cocamide, PEG-5 cocamide, PEG-6 cocamide, PEG-7 cocamide, PEG-3 lauramide, PEG-5 lauramide, PEG-3 oleamide, PPG-2 cocamide, PPG-2 hydroxyethyl cocamide, PPG-2 hydroxyethyl isostearamide, and mixtures thereof.

[0048] Representative polyoxyethylenated alcohols include alkyl chains ranging from C9 to C16 and having from about 1 to about 110 alkoxy groups, including, but not limited to, laureth-3, laureth-23, ceteth-10, steareth-10, steareth-100, beheneth-10, and those commercially available from Shell Chemicals (Houston, Texas) under the trade names Neodol® 91, Neodol® 23, Neodol® 25, Neodol® 45, Neodol® 135, Neodo® 167, Neodol® PC100, Neodol® PC200, Neodol® PC600, and mixtures thereof.

[0049] Also commercially available are the polyoxyethylene aliphatic ethers available from Uniqema (Wilmington, Delaware) under the trade name Brij®, including, but not limited to, Brij® 30, Brij® 35, Brij® 52, Brij® 56, Brij® 58, Brij® 72, Brij® 76, Brij® 78, Brij® 93, Brij® 97, Brij® 98, Brij® 721, and mixtures thereof.

[0050] Suitable alkyl glycosides and alkyl polyglucosides can be represented by the formula (S)nOR, where S is a sugar moiety such as glucose, fructose, mannose, galactose, etc., n is an integer from about 1 to about 1000, and R is a C8-C30 alkyl group. Examples of long chain alcohols from which the alkyl group can be derived include decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, oleyl alcohol, and the like. Examples of these surfactants include alkyl polyglucosides, where S is a glucose moiety, R is a C8-20 alkyl group, and n is an integer from about 1 to about 9. Commercially available examples of these surfactants include decyl polyglucosides and lauryl polyglucosides available from Cognis (Ambler, Pa.) under the trade names APG® 325CS, APG® 600CS, and APG® 625CS. Also useful herein are sucrose ester surfactants such as sucrose cocoate and sucrose laurate, as well as alkyl polyglucosides available from Dow Chemical Company (Houston, Tx) under the trade names Triton™ BG-10 and Triton™ CG-110.

[0051] Other nonionic surfactants suitable for use in the present invention are glyceryl esters and polyglyceryl esters, including, but not limited to, glyceryl monoesters, glyceryl monoesters of C12-22 saturated, unsaturated, and branched fatty acids, such as glyceryl oleate, glyceryl monostearate, glyceryl monopalmitate, glyceryl monobehenate, and mixtures thereof, and polyglyceryl esters of C12-22 saturated, unsaturated, and branched fatty acids, such as polyglyceryl-4 isostearate, polyglyceryl-3 oleate, polyglyceryl-2-sesquioleate, triglyceryl diisostearate, diglyceryl monooleate, tetraglyceryl monooleate, and mixtures thereof.

[0052] Also useful herein as nonionic surfactants are sorbitan esters. Sorbitan esters of C12-22 saturated, unsaturated, and branched fatty acids are useful herein. These sorbitan esters typically include mixtures of esters such as monoesters, diesters, triesters, etc. Representative examples of suitable sorbitan esters include sorbitan monolaurate (SPAN® 20), sorbitan monopalmitate (SPAN® 40), sorbitan monostearate (SPAN® 60), sorbitan tristearate (SPAN® 65), sorbitan monooleate (SPAN® 80), sorbitan trioleate (SPAN® 85), and sorbitan isostearate.

[0053] Also suitable for use herein are alkoxylated derivatives of sorbitan esters, including, but not limited to, polyoxyethylene (20) sorbitan monolaurate (Tween® 20), polyoxyethylene (20) sorbitan monopalmitate (Tween® 40), polyoxyethylene (20) sorbitan monostearate (Tween® 60), polyoxyethylene (20) sorbitan monooleate (Tween® 80), polyoxyethylene (4) sorbitan monolaurate (Tween® 21), polyoxyethylene (4) sorbitan monostearate (Tween® 61), polyoxyethylene (5) sorbitan monooleate (Tween® 81), and mixtures thereof, all available from Uniqema.

[0054] Also suitable for use herein are alkylphenol ethoxylates, including, but not limited to, nonylphenol ethoxylates (Tergitol™ NP-4, NP-6, NP-7, NP-8, NP-9, NP-10, NP-11, NP-12, NP-13, NP-15, NP-30, NP-40, NP-50, NP-55, NP-70, available from Dow Chemical Company, Houston, Tex.) and octylphenol ethoxylates (Triton™ X-15, X-35, X-45, X-114, X-100, X-102, X-165, X-305, X-405, X-705, available from Dow Chemical Company, Houston, Tex.).

[0055] Also suitable for use herein are the tertiary alkyl amine oxides, including lauramine oxide and cocamine oxide.

[0056] Non-limiting examples of other anionic, zwitterionic, amphoteric, and nonionic additional surfactants suitable for use in the hair care compositions are described in McCutcheon's "Emulsifiers and Detergents, 1989 Annual" (MC Publishing Co.), as well as U.S. Pat. Nos. 3,929,678, 2,658,072, 2,438,091, and 2,528,378, which are incorporated herein by reference in their entireties.

[0057] Suitable surfactant combinations include an average weight percent alkyl branching of about 0.5% to about 30%, alternatively about 1% to about 25%, alternatively about 2% to about 20%. The surfactant combination can have a cumulative average C8-C12 alkyl chain length weight percent of about 7.5% to about 25%, alternatively about 10% to about 22.5%, alternatively about 10% to about 20%. The surfactant combination can have an average C8-C12 / C13-C18 alkyl chain ratio of about 3 to about 200, alternatively about 25 to about 175.5, alternatively about 50 to about 150, alternatively about 75 to about 125.

[0058] Stabilizing Polymer The personal care composition may include a stabilizing polymer to increase the viscosity or yield stress of the composition. Any suitable stabilizing polymer may be used. The hair care composition may include from about 0.05% to about 10%, from 0.1% to about 9% of the stabilizing, from about 0.4% to about 8% of the stabilizing polymer, from about 0.7% to about 5% of the stabilizing modifying polymer, and from about 1% to about 2.5% of the stabilizing polymer. The stabilizing polymer modifying agent may be a polyacrylate, a polyacrylamide thickener. The stabilizing polymer may be an anionic stabilizing polymer. The sulfur-containing premix contains from about 0.1% to about 9% of the composition.

[0059] The personal care compositions may include stabilizing polymers that are homopolymers based on acrylic acid, methacrylic acid, or other related derivatives, non-limiting examples include polyacrylates, polymethacrylates, polyethylacrylates, and polyacrylamides.

[0060] The stabilizing polymers may be alkali-swellable and hydrophobically modified alkali-swellable acrylic or methacrylate copolymers, non-limiting examples of which include acrylic acid / acrylonitrile copolymer, acrylates / steareth-20 itaconate copolymer, acrylates / ceteth-20 itaconate copolymer, acrylates / aminoacrylate / C10-30 alkyl PEG-20 itaconate copolymer, acrylates / aminoacrylate copolymer, acrylates / steareth-20 methacrylate copolymer, a Acrylates / Beheneth-25 Methacrylate Copolymer, Acrylates / Steareth-20 Methacrylate Crosspolymer, Acrylates / Beheneth-25 Methacrylate / HEMA Crosspolymer, Acrylates / Vinyl Neodecanoate Crosspolymer, Acrylates / Vinyl Isodecanoate Crosspolymer, Acrylates / Palmeth-25 Acrylate Copolymer, Acrylic Acid / Acrylamidomethylpropanesulfonic Acid Copolymer, and Acrylates / C10-C30 Alkyl Acrylate Crosspolymer.

[0061] The stabilizing polymer may be a soluble crosslinked acrylic polymer, a non-limiting example of which is carbomer.

[0062] The stabilizing polymer may be an associative polymer thickener, non-limiting examples of which include hydrophobically modified alkali swellable emulsions, non-limiting examples of which include hydrophobically modified polyacrylates; hydrophobically modified polyacrylic acids, and hydrophobically modified polyacrylamides; hydrophobically modified polyethers, which may have a hydrophobicity selected from cetyl, stearyl, oleayl, and combinations thereof.

[0063] The stabilizing polymer may be used in combination with polyvinylpyrrolidone, crosslinked polyvinylpyrrolidone, and derivatives. The stabilizing polymer may be combined with polyvinyl alcohol and derivatives. The stabilizing polymer may be combined with polyethyleneimine and derivatives.

[0064] Stabilizing polymers may be combined with alginate-based materials, non-limiting examples of which include sodium alginate and propylene glycol alginate.

[0065] Stabilizing polymers can be used in combination with polyurethane polymers, non-limiting examples of which include hydrophobically modified alkoxylated urethane polymers, non-limiting examples of which include PEG-150 / Decyl Alcohol / SMDI Copolymer, PEG-150 / Stearyl Alcohol / SMDI Copolymer, Polyurethane-39.

[0066] Stabilizing polymers may be combined with associative polymer thickeners, non-limiting examples include hydrophobically modified cellulose derivatives and hydrophilic moieties of repeating ethylene oxide groups with repeat units of 10 to 300, 30 to 200, and 40 to 150. Non-limiting examples of this category include PEG-120-methyl glucose dioleate, PEG-(40 or 60) sorbitan tetraoleate, PEG-150 pentaerythrityl tetrastearate, PEG-55 propylene glycol oleate, PEG-150 distearate.

[0067] The stabilizing polymer may be combined with cellulose and derivatives including cellulose gums, non-limiting examples of which include microcrystalline cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, ethyl cellulose; nitrocellulose; cellulose sulfate; cellulose powder; hydrophobically modified cellulose.

[0068] The stabilizing polymer may be combined with guar and guar derivatives, non-limiting examples of which include hydroxypropyl guar, and hydroxypropyl guar hydroxypropyltrimonium chloride.

[0069] The stabilizing polymer may be combined with polyethylene oxide, polypropylene oxide, and POE-PPO copolymers.

[0070] The stabilizing polymer has the following general formula:

[0071] [ka] may be combined with a polyalkylene glycol characterized by: where R is hydrogen, methyl, or a mixture thereof, preferably hydrogen, and n is an integer having an average of 2,000 to 180,000, or 7,000 to 90,000, or 7,000 to 45,000. Non-limiting examples of this category include PEG-7M, PEG-14M, PEG-23M, PEG-25M, PEG-45M, PEG-90M, or PEG-100M.

[0072] The stabilizing polymer may be combined with silica, non-limiting examples of which include fumed silica, precipitated silica, and silicone surface treated silica.

[0073] The stabilizing polymer may be combined with a water-swellable clay, non-limiting examples of which include laponite, bentonite, montmorillonite, smectite, and hectonite.

[0074] The stabilizing polymer may be combined with gums, non-limiting examples of which include xanthan gum, guar gum, hydroxyprolyl guar gum, gum arabic, tragacanth, galactan, carob gum, karaya gum, and locust bean gum.

[0075] The stabilizing polymers may be combined with dibenzylidene sorbitol, carrageenan, pectin, agar, quince seed (Cydonia oblonga Mill), starch (obtained from rice, corn, potato, wheat, etc.), starch derivatives (e.g., carboxymethyl starch, methylhydroxypropyl starch), algae extracts, dextran, succinoglucan, and prelan.

[0076] Non-limiting examples of stabilizing polymers include acrylamide / ammonium acrylate copolymer (and) polyisobutene (and) polysorbate 20; acrylamide / sodium acryloyldimethyltaurate copolymer / isohexadecane / polysorbate 80, ammonium acryloyldimethyltaurate / VP copolymer, sodium acrylate / sodium acryloyldimethyltaurate copolymer, acrylates copolymer, acrylates crosspolymer-4, acrylates crosspolymer-3, acrylates / beheneth-25 methacrylate copolymer, acrylates / C10-C30 alkyl acrylate crosspolymer, acrylates / steareth-20 itaconate copolymer, polysorbate 80 ... Ammonium triacrylate / isohexadecane / PEG-40 castor oil; carbomer, sodium carbomer, crosslinked polyvinylpyrrolidone (PVP), polyacrylamide / C13-14 isoparaffin / laureth-7, polyacrylate 13 / polyisobutene / polysorbate 20, polyacrylate crosspolymer-6, polyamide-3, polyquaternium-37 (and) hydrogenated polydecene (and) trideceth-6, acrylamide / sodium acryloyldimethyltaurate / acrylic acid copolymer, sodium acrylate / acryloyldimethyltaurate / dimethylacrylamide crosspolymer (and) isohexadecane (and) polysorbate 60, sodium polyacrylate.Exemplary commercially available stabilizing polymers include ACULYN™ 28, ACULYN™ 88, ACULYN™ 33, ACULYN™ 22, ACULYN™ Excel, Carbopol® Aqua SF-1, Carbopol® ETD 2020, Carbopol® Ultrez 20, Carbopol® Ultrez 21, Carbopol® Ultrez 10, Carbopol® Ultrez 30, Carbopol® 1342, Carbopol® Aqua SF-2 polymer, Sepigel™ 305, Simulgel™ 600, Sepimax Zen, Carbopol® SMART1000, Rheocare® TTA, Rheomer® SC-Plus, STRUCTURE® PLUS, Aristoflex® AVC, Stabylen® 30, and combinations thereof.

[0077] Suspension wax The suspending wax includes suitable stabilizers that increase yield stress and viscosity. Such materials include those having the following formula:

[0078] [ka] and the like may include monoesters and / or diesters of alkylene glycols having the formula In the formula, R1 is a linear or branched C12 to C22 alkyl group, R is a linear or branched C2-C4 alkylene group; P is selected from H, C1-C4 alkyl, or -COR2, where R2 is C4-C22 alkyl, or can be C12-C22 alkyl; n=1 to 3.

[0079] In the present invention, the long chain fatty ester may have the above general structure, where R1 is a linear or branched C16 to C22 alkyl group, R is -CH2-CH2-, P is selected from H or -COR2, and R2 is a C4 to C22 alkyl or may be a C12 to C22 alkyl.

[0080] Typical examples are mono- and / or diesters of fatty acids containing from about 6 to about 22, from about 12 to about 18 carbon atoms, such as caproic acid, caprylic acid, 2-ethylhexanoic acid, capric acid, lauric acid, isotridecanoic acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, linoleic acid, linolenic acid, arachic acid, gadoleic acid, behenic acid, erucic acid, and mixtures thereof, with ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, or tetraethylene glycol.

[0081] In the present invention, ethylene glycol monostearate (EGMS) and / or ethylene glycol distearate (EGDS) and / or polyethylene glycol monostearate (PGMS) and / or polyethylene glycol distearate (PGDS) may be the suspending wax used in the composition. There are several commercial sources of these materials. For example, PEG6000MS® is available from Stepan and Empilan EGDS / A® is available from Albright & Wilson.

[0082] Traditionally, glyceride ester compounds can be used as structuring agents in personal care compositions.For example, Thixcin® R is a trihydroxystearin, a commercially available hydrogenated castor oil manufactured by Elementis Specialty (New Jersey) and marketed as a stabilizer and structuring agent for personal care compositions.Suitable glyceride esters for the personal care compositions described herein can be selected from any crystalline glyceride ester that allows the formation of coacervates in personal care compositions that include suitable surfactants and cationic polymers.For example, a suitable glyceride ester is hydrogenated castor oil (such as trihydroxystearin or dihydroxystearin).

[0083] Examples of additional crystalline glyceride esters may include substantially pure triglyceride of 12-hydroxystearic acid.12-hydroxystearic acid is the pure form of triglyceride of 12-hydroxy-9-cis-octadecenoic acid that is completely hydrogenated.As can be understood, many additional glyceride esters are possible.For example, changes in hydrogenation process and natural changes in castor oil may allow the production of additional suitable glyceride esters from castor oil.

[0084] Suitable glyceride esters can also be formed from a mixture of one or more glycerides. For example, a mixture of glycerides containing about 80% or more of castor oil by weight of the mixture can be suitable. Other suitable mixtures can include a mixture of only triglycerides, a mixture of diglycerides and triglycerides, a mixture of triglycerides, diglycerides, and monoglycerides in limited amounts, such as less than about 20% by weight of the mixture, or any mixture thereof containing no more than about 20% by weight of the mixture of the corresponding acid hydrolysis products of any of the glycerides. About 80% or more by weight of the mixture can be chemically identical to the glyceride of fully hydrogenated ricinoleic acid, i.e., the glyceride of 12-hydroxystearic acid. Hydrogenated castor oil can be modified so that in a given triglyceride, there are two 12-hydroxystearin moieties and one stearin moiety. Alternatively, partial hydrogenation can be used. However, poly(oxyalkylated) castor oil is not preferred because it has an unfavorable melting point.

[0085] Castor oil includes glycerides, particularly triglycerides, that contain C10-C22 alkyl or alkenyl moieties with hydroxy groups. Hydrogenation of castor oil produces hydrogenated castor oil by conversion of double bonds present in the starting oil as ricinoleyl moieties. These moieties are converted to ricinoleyl moieties, which are saturated hydroxyalkyl moieties, e.g., hydroxystearyl. Hydrogenated castor oil (HCO) herein may be selected from trihydroxystearin, dihydroxystearin, and mixtures thereof. HCO can be processed in any suitable starting form, including, but not limited to, selected from solids, melts, and mixtures thereof. Useful HCO can have the following properties: a melting point of about 40° C. to about 100° C., alternatively about 65° C. to about 95° C., and / or an iodine value ranging from about 0 to about 5, alternatively about 0 to about 4, alternatively about 0 to about 2.6. The melting point of HCO can be measured using DSC: Differential Scanning Calorimetry.

[0086] Suitable HCOs include those available commercially. Non-limiting examples of commercially available HCOs suitable for use include THIXCIN-R® (supplied by Elementis), which is supplied as a powder having small particles (99% by weight smaller than 44 μm).

[0087] The present invention is not intended to be limited to the use of hydrogenated castor oil. Any other suitable crystallizable glycerides may be used. In one example, the structurant is a nearly pure triglyceride of 12-hydroxystearic acid. This molecule represents the pure form of the triglyceride of 12-hydroxy-9-cis-octadecenoic acid, which is fully hydrogenated. In nature, the composition of castor oil may vary to some extent. Similarly, the method of hydrogenation may vary. Any other suitable equivalent material may be used, such as a mixture of triglycerides, of which at least about 80% by weight is derived from castor oil. Exemplary equivalent materials comprise primarily or consist of triglycerides; or comprise primarily or consist of mixtures of diglycerides and triglycerides; or comprise primarily or consist of mixtures of triglycerides and diglycerides and limited amounts of monoglycerides, e.g., less than about 20% by weight of the mixture of glycerides; or comprise primarily or consist of any of the foregoing glycerides and limited amounts, e.g., less than about 20% by weight of the corresponding acid hydrolysis products of any of the foregoing glycerides.

[0088] The stabilized premix contains from about 4% to about 30% of 100% active stabilizer by weight of the personal care composition. In the present invention, the stabilized premix may contain from about 15% to about 25% stabilizer.

[0089] The suspended wax in the present invention may be from about 0.01% to about 4%, the suspended wax in the present invention may be from about 0.1% to about 3%, the suspended wax in the present invention may be from about 0.5% to about 2%, and the suspended wax in the present invention may be from about 0.3% to about 1.5%.

[0090] Water-miscible solvents Carriers for personal care compositions can include water and aqueous solutions of lower alkyl alcohols, polyhydric alcohols, ketones having 3-4 carbon atoms, C1-C6 esters of C1-C6 alcohols, sulfoxides, amides, carbonates, ethoxylated and propoxylated C1-C10 alcohols, lactones, pyrrolidones, and mixtures thereof. Non-limiting examples of lower alkyl alcohols are monohydric alcohols having 1-6 carbons, such as ethanol and isopropanol. Non-limiting examples of polyhydric alcohols useful herein include propylene glycol, dipropylene glycol, butylene glycol, hexylene glycol, glycerin, propanediol, and mixtures thereof.

[0091] In the present invention, the hair care composition may include a hydrotrope / viscosity modifier which is an alkali metal or ammonium salt of a lower alkylbenzene sulfonate, such as sodium xylene sulfonate, sodium cumene sulfonate, or sodium toluene sulfonate.

[0092] In the present invention, the hair care composition can include silicone / PEG-8 silicone, silicone / PEG-9 silicone, silicone / PEG-n silicone, silicone / silicone ether (n can be another integer), non-limiting examples include PEG8-Dimethicone A208) MW855, PEG8 Dimethicone D208 MW2706.

[0093] Optional Ingredients In the present invention, the personal care composition may further comprise one or more optional ingredients, including scalp health and benefit agents.Suitable scalp health and benefit agents include, but are not limited to, conditioning agents, cationic polymers, silicone emulsions, antidandruff agents, such as polyvalent metal salts of pyrithione, non-limiting examples of which include zinc pyrithione (ZPT) and copper pyrithione, or selenium sulfide, benefit agents that provide moisturizing, barrier improvement, antifungal, antibacterial and antioxidant, anti-itch, and sensate, gel networks, chelating agents, and natural oils, such as sunflower oil or castor oil.Additional suitable optional ingredients include fragrances, fragrance microcapsules, colorants, particles, antimicrobial agents, antifoaming agents, antistatic agents, flow control agents and thickeners, emulsifiers, suspending agents and structuring agents, pH adjusters and buffers, preservatives, pearlescent agents, solvents, diluents, antioxidants, vitamins, vitamins E and F, salicylic acid, niacinamide, caffeine, panthenol, zinc oxide, zinc carbonate, zinc carbonate basic, glycols, glycolic acid, PCA, PEG, erythritol, glycerin, triclosan, lactates, hyaluronates, allantoin and other ureas, betaines, solanacids, sorbitol, sorbitols ... Lubitol, glutamate, xylitol, menthol, menthyl lactate, isocyclomone, benzyl alcohol, charcoal, Whitfield's ointment, Castellani paint, aluminum chloride, gentian violet, octopirox (piroctone olamine), ciclopirox olamine, undecylenic acid and its metal salts, azoxystrobin and other strobulins, potassium permanganate, sodium thiosulfate, propylene glycol, bitter orange oil, urea preparations, griseofulvin, 8-hydroxyquinoline cycloquinol, thiobendazole, Thiocarbamates, haloprogines, polyenes, hydroxypyridones, morpholines, benzylamines, allylamines (such as terbinafine), tea tree oil, clove leaf oil, coriander, palmarosa, berberine, thyme red, cinnamon oil, cinnamaldehyde, citronellic acid, hinokitol, ichthyol pale, Sensiva SC-50, Elastab HP-100, azelaic acid, lyticase, iodopropynyl butylcarbamate (IPBC), isothiazalinones such as octylisothiazalinones, and azoles, itraconazole, ketoconazole. These include, but are not limited to, benzothiazole, bifonazole, butaconazole nitrate, climbazole, clotrimazole, cloconazole, eberconazole, econazole, elubiol, fenticonazole, fluconazole, fluthiazole, isoconazole, ketoconazole, lanoconazole, metronidazole, miconazole, neticonazole, omoconazole, oxiconazole nitrate, sertaconazole, sulconazole nitrate, tioconazole, thiazole, terconazole and combinations thereof.In the present invention, the flavoring may be present at about 0.5% to about 7%.

[0094] One or more stabilizers may be included, for example, one or more of ethylene glycol distearate, preservatives such as citric acid, citrate salts, catone, sodium chloride, sodium benzoate, and ethylenediaminetetraacetic acid ("EDTA"), to enhance the longevity of the personal care composition.

[0095] Such optional ingredients should be physically and chemically compatible with the components of the composition and should not otherwise unduly impair the stability, aesthetics, or performance of the product. The CTFA Cosmetic Ingredient Handbook, Tenth Edition (published by the Cosmetic, Toiletry, and Fragrance Association, Inc. (Washington, DC)) (2004) (hereinafter "CTFA") describes a variety of non-limiting materials that may be added to the compositions herein.

[0096] Chelating Agents The personal care composition may further comprise a chelating agent. Suitable chelating agents include those described in AE Martell & RM Smith, Critical Stability Constants, Vol. 1, Plenum Press, New York & London (1974) and AE Martell & RD Hancock, Metal Complexes in Aqueous Solution, Plenum Press, New York & London (1996), both of which are incorporated herein by reference. With respect to chelating agents, the term "salts and derivatives thereof" refers to salts and derivatives that contain the same functional structure (e.g., the same chemical backbone) as the chelating agent being referenced and have similar or better chelating properties. This term includes alkali metal, alkaline earth, ammonium, substituted ammonium salts (i.e., monoethanolammonium, diethanolammonium, triethanolammonium) salts, esters of chelating agents with acidic moieties, and mixtures thereof, particularly all sodium, potassium, or ammonium salts. The term "derivative" also includes "chelating surfactant" compounds such as those exemplified in U.S. Pat. No. 5,284,972, and larger molecules containing one or more chelating groups with the same functional structure as the parent chelator, such as the polymer EDDS (ethylenediaminedisuccinic acid) disclosed in U.S. Pat. No. 5,747,440.

[0097] Chelating agents can be incorporated into the compositions described herein in amounts ranging from 0.001% to 10.0% by weight of the total composition, preferably from 0.01% to 2.0%.

[0098] Non-limiting classes of chelating agents include carboxylic acids, aminocarboxylic acids, such as aminocids, phosphoric acids, phosphonic acids, polyphosphonic acids, polyethyleneimines, polyfunctionally substituted aromatics, derivatives and salts thereof.

[0099] Non-limiting chelating agents include the following materials and their salts: ethylenediaminetetraacetic acid (EDTA), ethylenediaminetriacetic acid, ethylenediamine-N,N'-disuccinic acid (EDDS), ethylenediamine-N,N'-diglutaric acid (EDDG), salicylic acid, aspartic acid, glutamic acid, glycine, malonic acid, histidine, diethylenetriaminepentaacetate (DTPA), N-hydroxyethylethylenediaminetriacetate, nitrilotriacetate, ethylenediaminetetrapropionate, trisodium EDTA, tetrahydrofuran ... Ethylenetetraaminehexaacetate, ethanol diglycine, propylenediaminetetraacetic acid (PDTA), methylglycine diacetate (MODA), diethylenetriaminepentaacetic acid, methylglycine diacetate (MGDA), N-acyl-N,N',N'-ethylenediaminetriacetic acid, nitrilotriacetic acid, ethylenediaminediglutaric acid (EDGA), 2-hydroxypropylenediaminedisuccinic acid (HPDS), glycinamide-N,N'-disuccinic acid (GADS), 2-Hydroxypropylenediamine-N,N'-disuccinic acid (HPDDS), N-2-hydroxyethyl-N,N-diacetic acid, glyceryl iminodiacetic acid, iminodiacetic acid-N-2-hydroxypropyl sulfonic acid, aspartic acid N-carboxymethyl-N-2-hydroxypropyl-3-sulfonic acid, alanine-N,N'-diacetic acid, aspartic acid-N,N'-diacetic acid, aspartic acid N-monoacetic acid, iminodisuccinic acid, diamine-N,N'-dipolyacid, monoa diaminoalkyldi(sulfosuccinate) (DDS), ethylenediamine-N,N'-bis(ortho-hydroxyphenylacetic acid), N,N'-bis(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid, ethylenediaminetetraproprionate, triethylenetetraaminehexaacetate, diethylenetriaminepentaacetate, dipicolinic acid, ethylenediaminedicysteic acid (EDC), ethylenediamine-N,N'-bis(2-hydroxyphenylacetic acid) (EDDHA), glutamic acid diacetate (GLDA), hexadentate aminocarboxylates (HBED), polyethyleneimine, 1-hydroxydiphosphonates, aminotri(methylenephosphonic acid) (ATMP), nitrilo trimethylene phosphonates (NTP), ethylenediamine tetramethylene phosphonates, diethylenetriamine pentamethylene phosphonates (DTPMP), ethane-1-hydroxydiphosphonates (HEDP), 2-phosphonobutane-1,2,4-tricarboxylic acid, polyphosphoric acid, sodium tripolyphosphate, tetrasodium diphosphate, hexametaphosphoric acid, sodium metaphosphate, phosphonic acids and derivatives, amino alkylene-poly(alkylene phosphonic acid), amino tri(1-ethylphosphonic acid), ethylenediamine tetra(1-ethylphosphonic acid), amino tri(1-propylphosphonic acid), Aminotri(isopropylphosphonic acid), ethylenediaminetetra(methylenephosphonic acid) (EDTMP), 1,2-dihydroxy-3,5-disulfobenzene.

[0100] Water-Based Carrier The personal care composition may be in the form of a pourable liquid (under ambient conditions). Thus, such compositions typically include a carrier, which is present at a concentration of about 40% to about 85%, alternatively about 45% to about 80%, alternatively about 50% to about 75% by weight of the hair care composition. The carrier may include water or a miscible mixture of water and an organic solvent, and in one embodiment, may include water with minimal or no significant concentration of organic solvent, except when incidentally incorporated into the composition as a minor component of other essential or optional ingredients.

[0101] Carriers useful in the personal care compositions of the present invention can include water and aqueous solutions of lower alkyl alcohols and polyhydric alcohols.Lower alkyl alcohols useful herein are monohydric alcohols having 1 to 6 carbons, in one embodiment, ethanol and isopropanol.Exemplary polyhydric alcohols useful herein include propylene glycol, hexylene glycol, glycerin, and propanediol.

[0102] Product form The personal care composition of the present invention may be present in a typical personal care formulation.The composition may be in the form of a solution, dispersion, emulsion, powder, talc, capsule, sphere, sponge, solid dosage form, foam, and other delivery mechanisms.The composition of the present invention may be in the form of leave-on hair products, such as hair tonics, treatment and styling products, rinse-off hair products, such as shampoos and personal cleansing products, and treatment products, and any other form that can be applied to hair.

[0103] method Viscosity measurement The viscosity of the personal care composition was measured using a cone and plate Brookfield RS rheometer equipped with cone C75-1 at 2s -1 The viscosity of the prepared personal care composition may be measured on a 2.5 mL sample at a constant shear rate of 1000 psi at 27°C for 3 minutes. In the present invention, the viscosity of the prepared personal care composition may be <20,000 cPs@2s^-1. The viscosity of the prepared personal care composition may be in the range of 8000-14000 cPs@2s^-1.

[0104] Sulfur particle size distribution measurement The particle size distribution of sulfur is measured with a Horiba LA-950 laser scattering particle size distribution analyzer with LA-950 for Windows software version 8.10. Continue stirring until the sulfur material is uniformly dispersed in the 1% SDS solution. While continuing to stir, transfer the dispersed sulfur to the Horiba apparatus with circulation (speed: 3), stirring (speed: 1), and sonication (power: 1) turned on to make a dispersion in 0.1% SDS. Add dispersed sulfur sample until the transmittance is approximately 90%. Using the refractive index values ​​of 2.245-0.10i for sulfur and 1.333 for the dispersant, report the D10, D50, and D90 values ​​on a volumetric basis.

[0105] Non-limiting examples of conventional mixing mechanisms would be pitched blade turbines, helical mixers, and tank swept mixing or edge swept mixers.

[0106] In the present invention, the method for preparing a personal care composition containing sulfur comprises the following steps: a) providing a composition comprising a surfactant, a stabilizer, and water, the composition comprising at least about 3.0% surfactant and sufficient stabilizer to establish a yield stress of at least 0.06 Pa; b) mixing the composition in step (a), wherein the agitator tip speed is between about 1.5 m / s and about 2.7 m / s with a recirculation turnover rate of greater than 1.8 turnovers / hour, and the agitator tip speed is between about 1.5 m / s and about 2.7 m / s with a recirculation turnover rate of greater than 1.8 turnovers / hour, and the agitator tip speed is greater than about {agitator circumference [m / revolution]} * {agitator rotation speed [revs / s]} and recirculation turnover rate is calculated by {recirculation pump speed [L / hour]} / {total turnover volume [L / turnover]}; and c) adding sulfur to the composition of step (b), maintaining the conditions of step b during the addition of sulfur and until the personal care composition is prepared. In the present invention, the premix may have a temperature of about 60° C. or less.

[0107] The tip speed of the stirring mechanism is calculated by the formula: {stirrer circumference [m / revolution]} *{Agitator Rotation Speed ​​[revs / s]} may be calculated conventionally. Agitator circumference may be a function of radius or diameter. Agitator rotation speed may be how mechanical speed is given. Revolutions per minute or RPM may be an industry standard way to measure speed for equipment or devices. Conventionally, the diameter may be marked on the device or provided in the specifications for the equipment or device. The rotation speed is part of the operating conditions of the equipment or device and how its operation is managed. A non-limiting example may be a mixer with a knob that can be used to set the speed, and the set speed is the RPM, which is what is actually being manipulated to run the equipment.

[0108] The recirculation turnover rate can be calculated conventionally by the formula: {recirculation pump rate [L / hour]} / {total turnover volume [L / turnover]}. The pump rate can be measured by using an instrument or device to measure the rate. A non-limiting example would be to use a flow meter in the pump line path. The turnover volume can be the total volume of the personal care composition. A non-limiting example would be to make a 50L batch, in which case the total volume would be 50L.

[0109] Yield stress table and yield stress measurement method To perform these measurements, we use a TA DHR3 rheometer equipped with a cone and plate geometry.

[0110] A solvent trap is added to prevent sample evaporation during the measurement, which uses a cone and plate geometry, runs up to 40° C., and lasts for approximately 30 minutes. Test 1 - Flow curve at 25°C: A steady-state flow curve in strain-controlled mode starting from 100 1 / s to 0.01 1 / s was performed at a fixed temperature of 25°C. To measure the dynamic yield stress, the shear rate is controlled and chosen to start at high shear. This measurement protocol minimizes the effect of sample thixotropy that can cause variability in the measurement of yield stress based on the shear history of the sample. The total time for this test is approximately 8 minutes. Test 2 - Temperature ramp: The shear rate was fixed at 2 s-1 and the temperature ramped from 25°C to 40°C. The shear rate of 2 s-1 was chosen to capture the low shear plateau of the worm like micellar microstructures present in the transparent phase. The total duration of this test was approximately 8 min. Test 3 - Flow curve at 40° C.: A steady-state flow curve in strain-controlled mode from 100 1 / s to 0.01 1 / s was performed at a fixed temperature of 40° C. The total time for this step is about 8 minutes.

[0111] The total time for the entire procedure, including sample loading, is approximately 30 min.

[0112] The data are analyzed by fitting a three-component model combined with a power law model, as shown below (hereinafter referred to as the three-component model).

[0113]

number

[0114]

number

[0115]

number

[0116] The data from Test 1, room temperature data, and Test 3, 40° C. data, were fitted with Biss's standard nonlinear regression algorithm to estimate a set of model parameters that best fit the data.

[0117] Caggioni, Marco, Veronique Trappe, and Patrick T. Spicer. "Variations of the Herschel-Bulkley exponent reflecting contributions of the viscous continuous phase to the shear rate-dependent stress of soft glassy materials." Journal of Rheology 64.2(2020):413-422. Incorporated herein by reference. EXAMPLES

[0118] 1) Build yield stress before sulfur addition (by adding particulate stabilizers). If sufficient yield stress is not built up before sulfur introduction, the sulfur will tend to settle out of the batch during mixing. This will manifest as low sulfur yields in the final product and large amounts of unincorporated sulfur residue in the production tank.

[0119] Figure 3 shows two photographs showing examples of untrapped sulfur remaining in the tank.

[0120] In the present invention, a composition including a surfactant, a stabilizer, and water may be provided, prior to sulfur addition, the composition including at least about 3.0% surfactant and sufficient stabilizer to build up a yield stress of at least 0.06 Pa.

[0121] Table 1. Sulfur yield vs. order of addition This table demonstrates the expected sulfur yields for different addition orders.

[0122] [Table 1]

[0123] 2) With tank recirculation, the agitator tip speed at the time of sulfur addition and thereafter (after yield stress has been built) is greater than about 1.5 m / s and less than about 2.7 m / s. As demonstrated in Example 5 below, mixing speed is too fast and large amounts of air are entrapped in the formulation, causing low as-made specific gravity (SG<0.98) in the final product, and subsequently causing irrecoverable phase separation in the final product regardless of final yield. b. As demonstrated in Example 4 below, if the rate is too low, even if there is sufficient yield stress in the system, the sulfur may not be suspended, resulting in low sulfur yield and / or final product phase separation.

[0124] Examples of processing using conventional methods: 1.) General Processing Techniques for Personal Care Compositions a. Uncontrolled or under-controlled mixing speeds - resulting in inhomogeneity and / or low sulfur yields b. Uncontrolled or under-controlled recycle and recycle rate - resulting in low sulfur yields 2.) General Processing Techniques for Microparticle-Containing Personal Care Compositions a. Addition order of stabilizers to fine particles not taken into consideration - resulting in inhomogeneity due to excessive mixing b. Methods of adding microparticles via premixes, where the premix does not contain stabilizers - leading to inhomogeneity in the premix, often accompanied by a reduction in the microparticle yield in the final product

[0125] result Table 2. The following examples demonstrate data generated when sulfur is added in the process of making a personal care composition, where the sulfur is added either before or after the stabilizer and various agitator tip speeds.

[0126] [Table 2] This data in Table 2 demonstrates that with the proper sequence of sulfur addition and agitator tip speed, personal care compositions exhibit adequate yield and stability.

[0127] Preparation of Personal Care Compositions The personal care composition is prepared directly from the premix or as an in-line process. When prepared by premix, the composition is prepared by adding the surfactant, antidandruff agent, stabilizer (as defined above) and the remainder as water in a specific order with stirring and recirculation as defined in claim 1. The premix is ​​then mixed with the fragrance, viscosity modifier, cationic polymer and the remaining water with sufficient stirring to ensure a homogenous and shelf stable mixture.

[0128] When performed as an in-line process, the personal care composition is prepared by adding surfactants, antidandruff agents, stabilizers (as defined above), fragrance, viscosity modifiers, cationic polymer, and the remaining water in the order as defined in claim 1 with stirring and recirculation to ensure a homogenous and shelf-stable mixture. In either case, the mixture can be heated to 50-75°C to accelerate solubilization of the soluble agents, and then cooled. Product pH may be adjusted as necessary to provide a shampoo composition of the present invention suitable for application to human hair and scalp, and may vary from about pH 4-9, or from about pH 4.5-6.5, or from about pH 5-6, based on the selection of the particular cleansing surfactant, and / or other ingredients.

[0129] combination A. A method for preparing a personal care composition comprising sulfur, the method comprising: a) providing a composition comprising a surfactant, a stabilizer, and water, the composition comprising at least about 3.0% surfactant and sufficient stabilizer to establish a yield stress of at least 0.06 Pa; b) mixing the composition in step (a), wherein the agitator tip speed is between about 1.5 m / s and about 2.7 m / s with a recirculation turnover rate of greater than 1.8 turnovers / hour, and the agitator tip speed is between about 1.5 m / s and about 2.7 m / s with a recirculation turnover rate of greater than 1.8 turnovers / hour, and the agitator tip speed is greater than about {agitator circumference [m / revolution]} *{agitator rotation speed [revs / s]} and recirculation turnover rate is calculated by {recirculation pump speed [L / hour]} / {total turnover volume [L / turnover]}; and c) adding sulfur to the composition of step (b), maintaining the conditions of step b during the addition of the sulfur and until the personal care composition is prepared. B. The method of paragraph A, wherein the stabilizer is selected from the group consisting of homopolymers based on acrylic acid, methacrylic acid or other related derivatives, polyacrylates, polymethacrylates, polyethylacrylates, and polyacrylamides, and mixtures thereof. C. The stabilizer is selected from the group consisting of alkali-swellable and hydrophobically modified alkali-swellable acrylic or methacrylate copolymers, non-limiting examples of which include acrylic acid / acrylonitrile copolymer, acrylates / steareth-20 itaconate copolymer, acrylates / ceteth-20 itaconate copolymer, acrylates / aminoacrylate / C10-30 alkyl PEG-20 itaconate copolymer, acrylates / aminoacrylate copolymer, acrylates / steareth-20 methacrylate copolymer, acrylates / The method of paragraphs A-B, comprising Beheneth-25 methacrylate copolymer, Acrylates / Steareth-20 methacrylate crosspolymer, Acrylates / Beheneth-25 methacrylate / HEMA crosspolymer, Acrylates / vinyl neodecanoate crosspolymer, Acrylates / vinyl isodecanoate crosspolymer, Acrylates / Palmeth-25 acrylate copolymer, Acrylic acid / acrylamidomethylpropane sulfonic acid copolymer, and Acrylates / C10-C30 alkyl acrylate crosspolymer. D. Stabilizers include acrylamide / ammonium acrylate copolymer (and) polyisobutene (and) polysorbate 20; acrylamide / sodium acryloyldimethyltaurate copolymer / isohexadecane / polysorbate 80, ammonium acryloyldimethyltaurate / VP copolymer, sodium acrylate / sodium acryloyldimethyltaurate copolymer, acrylates copolymer, acrylates crosspolymer-4, acrylates crosspolymer-3, acrylates / beheneth-25 methacrylate copolymer, acrylates / C10-C30 alkyl acrylate crosspolymer, acrylates / steareth-20 itaconate copolymer, ammonium polyacrylate / isohexadecane / polysorbate 80. sadecane / PEG-40 castor oil; carbomer, sodium carbomer, crosslinked polyvinylpyrrolidone (PVP), polyacrylamide / C13-14 isoparaffin / laureth-7, polyacrylate 13 / polyisobutene / polysorbate 20, polyacrylate crosspolymer-6, polyamide-3, polyquaternium-37 (and) hydrogenated polydecene (and) trideceth-6, acrylamide / sodium acryloyldimethyltaurate / acrylic acid copolymer, sodium acrylate / acryloyldimethyltaurate / dimethylacrylamide, crosspolymer (and) isohexadecane (and) polysorbate 60, sodium polyacrylate. E. The method of paragraphs A-D, wherein the stabilizer is selected from the group consisting of monoesters and / or diesters of fatty acids containing from about 6 to about 22 carbon atoms, from about 12 to about 18 carbon atoms, such as caproic acid, caprylic acid 2-ethylhexanoic acid, capric acid, lauric acid, isotridecanoic acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, linoleic acid, linolenic acid, arachic acid, gadoleic acid, behenic acid, erucic acid, and mixtures thereof, and ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol, or tetraethylene glycol. F. The method of paragraphs A-E, wherein the stabilizer is selected from the group consisting of ethylene glycol monostearate (EGMS) and / or ethylene glycol distearate (EGDS) and / or polyethylene glycol monostearate (PGMS) and / or polyethylene glycol distearate (PGDS). G. The method of paragraphs A-F, wherein the stabilizer is trihydroxystearin. The method of paragraphs A-G, wherein the composition in H.1a) comprises about 3% to about 20% by weight of a surfactant. The method of paragraphs AH, wherein the composition in I.1a) comprises about 3% to about 9% by weight of a surfactant. J. The method of paragraphs AI, wherein the premix has a temperature of about 60°C or less.

[0130] It will be understood that other modifications of the present disclosure within the skill of those skilled in the art of personal care formulations may be made without departing from the spirit and scope of the present invention. All parts, percentages, and ratios herein are by weight unless otherwise specified. Some components may be provided as dilute solutions by the supplier. The concentrations listed represent the weight percent of actives unless otherwise specified. Concentrations of fragrances and / or preservatives may also be included in the following examples.

[0131] 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."

[0132] All documents cited herein, including any cross-referenced or related patents or patent applications, and any patent applications or patents 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 given to that term in this document shall govern.

[0133] 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. 1. A method for preparing a personal care composition comprising sulfur, the method comprising: a) providing a composition comprising a surfactant, a stabilizer, and water, said composition comprising at least 3.0% surfactant and sufficient stabilizer to establish a yield stress of at least 0.06 Pa; b) mixing the composition in step (a), wherein the agitator tip speed is between 1.5 m / s and 2.7 m / s with a recirculation turnover rate of greater than 1.8 turnovers / hour, and the agitator tip speed is {agitator circumference [m / revolution]} ＊ {agitator rotation speed [revs / s]}, and the recirculation turnover rate is calculated by {recirculation pump speed [L / hour]} / {total turnover volume [L / turnover]}; c) adding sulfur to the composition of step (b), maintaining the conditions of step (b) during the addition of sulfur and until the personal care composition is prepared; The method includes:

2. 2. The method of claim 1, wherein the stabilizer is selected from the group consisting of homopolymers based on acrylic acid, methacrylic acid or other related derivatives, polyacrylates, polymethacrylates, polyethylacrylates, and polyacrylamides, and mixtures thereof.

3. The stabilizer is selected from the group consisting of alkali swellable and hydrophobically modified alkali swellable acrylic or methacrylate copolymers, non-limiting examples of which include acrylic acid / acrylonitrile copolymer, acrylates / steareth-20 itaconate copolymer, acrylates / ceteth-20 itaconate copolymer, acrylates / aminoacrylate / C10-30 alkyl PEG-20 itaconate copolymer, acrylates / aminoacrylate copolymer, acrylates / steareth-20 methacrylate copolymer, acrylates 3. The method of claim 1 or 2, comprising an aqueous acrylic acid / beheneth-25 methacrylate copolymer, acrylates / steareth-20 methacrylate crosspolymer, acrylates / beheneth-25 methacrylate / HEMA crosspolymer, acrylates / vinyl neodecanoate crosspolymer, acrylates / vinyl isodecanoate crosspolymer, acrylates / palmeth-25 acrylate copolymer, acrylic acid / acrylamidomethylpropane sulfonic acid copolymer, and acrylates / C10-C30 alkyl acrylate crosspolymer.

4. The stabilizers include acrylamide / ammonium acrylate copolymer (and) polyisobutene (and) polysorbate 20; acrylamide / sodium acryloyldimethyltaurate copolymer / isohexadecane / polysorbate 80, ammonium acryloyldimethyltaurate / VP copolymer, sodium acrylate / sodium acryloyldimethyltaurate copolymer, acrylates copolymer, acrylates crosspolymer-4, acrylates crosspolymer-3, acrylates / beheneth-25 methacrylate copolymer, acrylates / C10-C30 alkyl acrylate crosspolymer, acrylates / steareth-20 itaconate copolymer, ammonium polyacrylate ... crosspolymer-4, acrylates crosspolymer-3, acrylates / beheneth-25 methacrylate copolymer, acrylates / C10-C30 alkyl acrylate crosspolymer, acrylates / steareth-20 itaconate copolymer, ammonium polyacrylate / isohexadecane / polysorbate 80, ammonium acryloyldimethyltaurate / VP copolymer, sodium acrylate / sodium acryloyldimethyltaurate copolymer, acrylates crosspolymer-4, acrylates crosspolymer-3, acrylates / beheneth-25 methacrylate copolymer, acrylates / C10-C30 alkyl acrylate crosspolymer, acrylates / steareth-20 itaconate copolymer, ammonium 4. The method according to claim 1, wherein the active ingredient is selected from the group consisting of: can / PEG-40 castor oil; carbomer, sodium carbomer, cross-linked polyvinylpyrrolidone (PVP), polyacrylamide / C13-14 isoparaffin / laureth-7, polyacrylate 13 / polyisobutene / polysorbate 20, polyacrylate crosspolymer-6, polyamide-3, polyquaternium-37 (and) hydrogenated polydecene (and) trideceth-6, acrylamide / sodium acryloyldimethyltaurate / acrylic acid copolymer, sodium acrylate / acryloyldimethyltaurate / dimethylacrylamide, crosspolymer (and) isohexadecane (and) polysorbate 60, sodium polyacrylate.

5. 5. The method according to any one of claims 1 to 4, wherein the stabiliser is selected from the group consisting of mono- and / or diesters of fatty acids containing from 6 to 22 carbon atoms, from 12 to 18 carbon atoms, such as caproic acid, caprylic acid 2-ethylhexanoic acid, capric acid, lauric acid, isotridecanoic acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, linoleic acid, linolenic acid, arachic acid, gadoleic acid, behenic acid, erucic acid and mixtures thereof, with ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, triethylene glycol or tetraethylene glycol.

6. 6. The method according to any one of claims 1 to 5, wherein the stabiliser is selected from the group consisting of ethylene glycol monostearate (EGMS) and / or ethylene glycol distearate (EGDS) and / or polyethylene glycol monostearate (PGMS) and / or polyethylene glycol distearate (PGDS).

7. The method according to any one of claims 1 to 6, wherein the stabilizer is trihydroxystearin.

8. The method according to any one of claims 1 to 7, wherein the composition in 1a) comprises from 3% to 20% by weight of a surfactant.

9. The method according to any one of claims 1 to 8, wherein the composition in 1a) comprises 3% to 9% by weight of a surfactant.

10. The composition of any one of claims 1 to 9, wherein the premix has a temperature of 60°C or less.

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