Personal care rinse-off composition with composite sunscreen particles

Abstract

An aqueous personal care rinse-off composition is provided comprising: a dermatologically acceptable aqueous vehicle; a dermatologically acceptable cleansing surfactant; and a plurality of composite sunscreen particles, wherein the composite sunscreen particles comprise metal oxide particles partially or completely encapsulated by a wax; wherein the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof; wherein the metal oxide particles have a z-average particle size > 100 nm as measured by dynamic light scattering; wherein the wax has a melting point temperature of from 50°C to 110°C; and wherein the composite sunscreen particles have a z-average particle size of from > 100 nm to 2,000 nm as measured by dynamic light scattering.

Description

[0001] This invention relates to an aqueous personal care wash-off composition. Specifically, the invention relates to an aqueous personal care wash-off composition comprising: a dermatologically acceptable aqueous carrier; a dermatologically acceptable cleansing surfactant; and a plurality of composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by wax; wherein the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof; wherein the metal oxide particles have a z-average particle size >100 nm as measured by dynamic light scattering; wherein the wax has a melting point temperature of 45°C to 110°C; and wherein the composite opacifier particles have a z-average particle size >100 nm to 2,000 nm as measured by dynamic light scattering.

[0002] Besides cleaning performance, the appearance and feel of detergents are important considerations for consumers. Therefore, detergents typically contain a variety of ingredients that affect functionality, aesthetics, or both, including, for example, surfactants, solvents, optional builders, and sunscreens.

[0003] Opacifiers are materials that make liquid systems opaque. Therefore, oppacifiers are used to alter the appearance or aesthetics of detergents, for example, by changing the liquid from transparent or translucent to opaque. Opacifiers can give liquid products a uniform, luxurious, "lotionized" appearance. Opacifiers are typically formed from submicron-sized particles that are delivered to the formulation as a suspension of particles in a solvent (usually water).

[0004] Because light-blocking agents are intended to enhance the aesthetics of a formulation, it is generally desirable that their inclusion does not interfere with the function of the formulation or otherwise negatively impact it. For example, light-blocking agents that exhibit limited compatibility with other materials in the formulation, have stability issues, or exhibit speckling or residue formation are disadvantageous. Furthermore, light-blocking agents that introduce large amounts of water into the formulation (e.g., are only effective with high-volume use) are also disadvantageous, particularly for formulations where limiting the amount of water is desired, such as in concentrated detergents or unit-dose packets.

[0005] Therefore, there is still a need for more sustainable sunscreens for water-based personal care wash-off compositions; specifically, sustainable sunscreens that perform comparably to conventional styrene-acrylate copolymer-based sunscreens.

[0006] This invention provides an aqueous personal care wash-off composition comprising: a dermatologically acceptable aqueous carrier; a dermatologically acceptable cleansing surfactant; and a plurality of composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by wax; wherein the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof; wherein the metal oxide particles have a z-average particle size of >100 nm as measured by dynamic light scattering; wherein the wax has a melting point temperature of 45°C to 110°C; and wherein the composite opacifier particles have a z-average particle size of >100 nm to 2,000 nm as measured by dynamic light scattering.

[0007] The present invention provides a method for cleaning at least one of mammalian skin and hair, the method comprising: (a) applying a personal care wash-off preparation according to the present invention to the skin or hair of a mammal; and (b) rinsing the personal care wash-off preparation off the skin or hair with rinsing water. Detailed Implementation

[0008] We have been surprised to find that composite opacifier particles containing metal oxide particles partially or completely encapsulated with wax (preferably natural wax) can be stably incorporated into aqueous personal care wash-off compositions to provide opacity comparable to conventional opacifiers based on styrene-acrylate copolymers, while increasing the overall sustainability of aqueous personal care wash-off compositions.

[0009] Unless otherwise specified, ratios, percentages, parts, etc. are all by weight.

[0010] As used herein, unless otherwise indicated, the phrase "molecular weight" or M w This refers to the weight-average molecular weight as measured using conventional methods with gel permeation chromatography (GPC) and poly(ethylene oxide) standards. GPC techniques are discussed in detail in "Modern Size Exclusion Chromatography," W.Y.A., J.J. Kirkland, D.B.D., Wiley-Interscience, 1979, and in "A Guide to Materials Characterization and Chemical Analysis," JP. Sibilia, V.C., 1988, pp. 81-84. Molecular weight is reported in Daltons or, equivalently, g / mol.

[0011] As used herein and in the appended claims, the term "dermatologically acceptable" refers to an ingredient typically used for topical skin application, and is intended to emphasize that toxic substances present in amounts typically found in skin care compositions are not considered part of the invention.

[0012] Preferably, the aqueous personal care wash-off composition of the present invention is selected from the group consisting of: shampoos, conditioning shampoos, shower gel formulations, exfoliating shower gel formulations, facial cleanser formulations, exfoliating facial cleanser formulations, liquid hand soap formulations, sulfate-free cleansing formulations, and mild cleansing formulations. More preferably, the aqueous personal care wash-off composition of the present invention is selected from the group consisting of: shower gel formulations, facial cleanser formulations, and liquid hand soap formulations. Most preferably, the aqueous personal care wash-off composition of the present invention is a shower gel formulation.

[0013] Preferably, the aqueous personal care wash-off composition of the present invention comprises: a dermatologically acceptable aqueous carrier (preferably, wherein the aqueous personal care wash-off composition comprises 25% to 99% by weight (preferably, 30% to 95% by weight; more preferably, 40% to 90% by weight; most preferably, 70% to 85% by weight) of the aqueous personal care wash-off composition); a dermatologically acceptable cleansing surfactant (preferably, wherein the aqueous personal care wash-off composition comprises 0.5% to 60% by weight (preferably, 1% to 50% by weight; more preferably, 5% to 30% by weight; most preferably, 7% to 20% by weight) of the aqueous personal care wash-off composition); and a plurality of composite sunscreen particles (preferably, wherein the aqueous personal care wash-off composition comprises 0.05% to 1% by weight of the aqueous personal care wash-off composition). The composite opacifier comprises 10% by weight (preferably, 0.1% to 7.5% by weight; more preferably, 0.5% to 5% by weight; most preferably, 0.75% to 3.0% by weight) of multiple composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by wax; wherein the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof; wherein the metal oxide particles have a z-average particle size >100 nm (preferably, 110 nm to 500 nm; more preferably, 150 nm to 400 nm; most preferably, 175 nm to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer); wherein the wax has a melting point temperature of 45°C to 110°C (preferably, 65°C to 100°C; more preferably, 75°C to 90°C; most preferably, 80°C to 90°C); and wherein the composite opacifier particles have a melting point temperature >100 nm (preferably, 65°C to 100°C; more preferably, 75°C to 90°C; most preferably, 80°C to 90°C) as measured by dynamic light scattering (e.g., using a universal liquid module). The z-average particle size (>100 nm to 2,000 nm, preferably 200 nm to 1,000 nm; more preferably 250 nm to 750 nm; most preferably 300 nm to 500 nm) was measured by a Beckman Coulter particle size analyzer (Liquid Module).

[0014] Preferably, the aqueous personal care wash-off composition of the present invention comprises a dermatologically acceptable aqueous carrier. More preferably, the aqueous personal care wash-off composition of the present invention comprises a dermatologically acceptable aqueous carrier at a weight of 25% to 99% (preferably 30% to 95%; more preferably 40% to 90%; most preferably 70% to 85%) of the aqueous personal care wash-off composition. Still more preferably, the aqueous personal care wash-off composition of the present invention comprises a dermatologically acceptable aqueous carrier at a weight of 25% to 99% (preferably 30% to 95%; more preferably 40% to 90%; most preferably 70% to 85%) of the aqueous personal care wash-off composition; wherein the dermatologically acceptable aqueous carrier comprises water. More preferably, the aqueous personal care wash-off composition of the present invention comprises: a dermatologically acceptable aqueous carrier at a weight of 25% to 99% (preferably, 30% to 95%; more preferably, 40% to 90%; most preferably, 70% to 85%) of the aqueous personal care wash-off composition; wherein the dermatologically acceptable aqueous carrier is selected from the group consisting of: water and aqueous C 1-4 Alcohol mixture. Most preferably, the aqueous personal care wash-off composition of the present invention comprises: 25% to 99% by weight (preferably, 30% to 95% by weight; more preferably, 40% to 90% by weight; most preferably, 70% to 85% by weight) of a dermatologically acceptable aqueous carrier based on the weight of the aqueous personal care wash-off composition, wherein the dermatologically acceptable aqueous carrier is water.

[0015] Preferably, the water used in the aqueous personal care wash-off composition of the present invention is at least one of distilled water and deionized water. More preferably, the water used in the aqueous personal care wash-off composition of the present invention is both distilled and deionized.

[0016] Preferably, the aqueous personal care wash-off composition of the present invention comprises 0.5% to 60% by weight (preferably 1% to 50% by weight; more preferably 5% to 30% by weight; most preferably 7% to 20% by weight) of a dermatologically acceptable cleansing surfactant based on the weight of the aqueous personal care wash-off composition. More preferably, the aqueous personal care wash-off composition of the present invention comprises 0.5% to 60% by weight (preferably 1% to 50% by weight; more preferably 5% to 30% by weight; most preferably 7% to 20% by weight) of a dermatologically acceptable cleansing surfactant based on the weight of the aqueous personal care wash-off composition; wherein the dermatologically acceptable cleansing surfactant is selected from the group consisting of: alkyl polyglucosides (e.g., lauryl glucoside, cocoyl glucoside, decyl glucoside), glycine salts (e.g., sodium cocoyl glycinate), betaine (e.g., alkyl betaine such as trimethyl... Glycine and cetyl betaine; and amide betaines such as cocamidopropyl betaine, taurine (e.g., sodium methyl cocoyl taurate), glutamate (e.g., sodium cocoyl glutamate), sarcosinate (e.g., sodium lauroyl sarcosinate), hydroxyethyl sulfonate (e.g., sodium cocoyl hydroxyethyl sulfonate, sodium lauroyl methyl hydroxyethyl sulfonate), sulfoacetate (e.g., sodium lauryl sulfoacetate), alanine (e.g., sodium cocoyl alanine), amphoteric acid (e.g., sodium cocoamphoacetate), sulfate (e.g., sodium laureth sulfate (SLES)), sulfonate (e.g., C 14-16Sodium olefin sulfonate), succinates (e.g., disodium lauryl sulfosuccinate); fatty alkanolamides (e.g., cocamidoyl alcoholamine, cocamidoyl alcoholamine, diethanolamine, soyamide diethanolamine, lauramide diethanolamine, oleamide monoisopropanolamine, stearamide monoethanolamine, myristamide monoethanolamine, lauramide monoethanolamine, decanoamide diethanolamine, ricinoleic acid amide diethanolamine, myristamide diethanolamine, stearamide diethanolamine, oleamide diethanolamine, tallow amide diethanolamine, lauramide monoisopropanolamine, tallow amide monoethanolamine, isostearamide diethanolamine, isostearamide diethanolamine, isostearamide diethanolamine, isostearamide monoethanolamine) and mixtures thereof. More preferably, the aqueous personal care wash-off composition of the present invention comprises 0.5% to 60% by weight (preferably 1% to 50% by weight; more preferably 5% to 30% by weight; most preferably 7% to 20% by weight) of a dermatologically acceptable cleansing surfactant based on the weight of the aqueous personal care wash-off composition; wherein the dermatologically acceptable cleansing surfactant comprises a mixture of sodium lauryl ether sulfate (SLES) and trimethylglycine. Most preferably, the aqueous personal care wash-off composition of the present invention comprises 0.5% to 60% by weight (preferably 1% to 50% by weight; more preferably 5% to 30% by weight; most preferably 7% to 20% by weight) of a dermatologically acceptable cleansing surfactant based on the weight of the aqueous personal care wash-off composition; wherein the dermatologically acceptable cleansing surfactant is a mixture of sodium lauryl ether sulfate (SLES) and trimethylglycine.

[0017] Preferably, the aqueous personal care wash-off composition of the present invention comprises a plurality of composite opacifier particles in an amount of 0.05% to 10% by weight (preferably 0.1% to 7.5% by weight; more preferably 0.5% to 5% by weight; most preferably 0.75% to 3% by weight) based on the weight of the aqueous personal care wash-off composition; wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by wax (preferably 50% to 100% encapsulation; more preferably 75% to 100% encapsulation; most preferably 90% to 100% encapsulation); wherein the metal oxide particles are selected from zinc oxide, titanium oxide, and the like. The mixture comprises the following: the metal oxide particles having a z-average particle size of >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., with a Brookhaven particle size analyzer); the wax having a melting point temperature of 45°C to 110°C (preferably 65°C to 100°C; more preferably 75°C to 90°C; most preferably 80°C to 90°C); and the composite opacifier particles having a z-average particle size of >100 nm to 2,000 nm (preferably 200 nm to 1,000 nm; more preferably 250 nm to 750 nm; most preferably 300 nm to 500 nm) as measured by dynamic light scattering (e.g., with a Beckman Coulter particle size analyzer with a universal liquid module).More preferably, the aqueous personal care wash-off composition of the present invention comprises a plurality of composite opacifier particles based on a weight of 0.05% to 10% (preferably, 0.1% to 7.5%; more preferably, 0.5% to 5%; most preferably, 0.75% to 3%) of the aqueous personal care wash-off composition; wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by wax (preferably, 50% to 100% encapsulation; more preferably, 75% to 100% encapsulation; most preferably, 90% to 100% encapsulation); wherein the composite opacifier particles comprise metal oxide particles based on a weight of 1% to 40% (preferably, 2% to 30%; more preferably, 3% to 25%; most preferably, 5% to 20%) of the composite opacifier particles; wherein the metal oxide particles are selected from zinc oxide, titanium oxide, and others. The mixture comprises a group of particles; wherein the metal oxide particles have a z-average particle size >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., with a Brookhaven particle size analyzer); wherein the composite opacifier particles contain 60 wt% to 99 wt% (preferably 70 wt% to 98 wt%; more preferably 75 wt% to 97 wt%; most preferably 80 wt% to 95 wt%) of wax based on the weight of the composite opacifier particles; wherein the wax has a melting point temperature of 45°C to 110°C (preferably 65°C to 100°C; more preferably 75°C to 90°C; most preferably 80°C to 90°C); and wherein the composite opacifier particles have a z-average particle size >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., with a Beckman particle size analyzer with a universal liquid module). The z-average particle size, measured by a Coulter particle size analyzer, is >100 nm to 2,000 nm (preferably 200 nm to 1,000 nm; more preferably 250 nm to 750 nm; most preferably 300 nm to 500 nm).Most preferably, the aqueous personal care wash-off composition of the present invention comprises 0.05% to 10% by weight (preferably 0.1% to 7.5% by weight; more preferably 0.5% to 5% by weight; most preferably 0.75% to 3% by weight) of the aqueous personal care wash-off composition; wherein the composite light-blocking particles comprise metal oxide particles partially or completely encapsulated by wax (preferably 50% to 100% encapsulation; more preferably 75% to 100% encapsulation; most preferably 90% to 100% encapsulation); wherein the composite light-blocking particles comprise 1% to 40% by weight (preferably 2% to 30% by weight; more preferably 3% to 25% by weight; most preferably 5% to 20% by weight) of metal oxide particles based on the weight of the composite light-blocking particles; wherein the metal oxide particles are titanium dioxide. The titanium dioxide particles have a z-average particle size of >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer); the composite opacifier particles comprise 60 wt% to 99 wt% (preferably 70 wt% to 98 wt%; more preferably 75 wt% to 97 wt%; most preferably 80 wt% to 95 wt%) of wax based on the weight of the composite opacifier particles; the wax has a melting point temperature of 45°C to 110°C (preferably 65°C to 100°C; more preferably 75°C to 90°C; most preferably 80°C to 90°C); and the composite opacifier particles have a z-average particle size of >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., using a Beckman with a universal liquid module). The z-average particle size, measured by a Coulter particle size analyzer, is >100 nm to 2,000 nm (preferably 200 nm to 1,000 nm; more preferably 250 nm to 750 nm; most preferably 300 nm to 500 nm).

[0018] Preferably, the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof; wherein the metal oxide particles have a z-average particle size of >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer). More preferably, the metal oxide particles include titanium dioxide particles having a z-average particle size of >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer). Most preferably, the metal oxide particles are titanium dioxide particles having a z-average particle size of >100 nm (preferably 110 nm to 500 nm; more preferably 150 nm to 400 nm; most preferably 175 nm to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer). Preferably, the metal oxide particles have a hydrophobic surface treatment (e.g., a polysiloxane surface coating).

[0019] Preferably, the wax is a natural wax. More preferably, the wax is a natural wax selected from the group consisting of carnauba wax, candelilla wax, myrica wax, castor wax, cocoa butter, thatch wax, laurel wax, Japanese wax, jojoba wax, crown palm wax, palm wax, rice bran wax, soybean wax, shea butter, sunflower wax, tallow tree wax, and mixtures thereof. Even more preferably, the wax is a natural wax selected from the group consisting of carnauba wax, castor wax, crown palm wax, rice bran wax, and mixtures thereof. Still more preferably, the wax is a natural wax including carnauba wax. Most preferably, the wax is carnauba wax.

[0020] Preferably, the wax contains C 23-31 Paraffin, C 24-36 fatty alcohols, C 12-36 Fatty acids and C-derived fatty acids 9-24 Fatty acids and C 12-36 Esters of fatty alcohols.

[0021] Preferably, the aqueous personal care wash-off composition of the present invention optionally further comprises at least one additional ingredient selected from the group consisting of: antimicrobial agents; rheology modifiers; soaps; colorants; pH adjusters; antioxidants (e.g., butylated hydroxytoluene); humectants (e.g., glycerin, sorbitol, monoglycerides, lecithin, glycolipids, fatty alcohols, fatty acids, polysaccharides, dehydrated sorbitol esters, polysorbates (e.g., polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 40)). The following are included: pear esters (80), diols (e.g., propylene glycol), diol analogs, triols, triol analogs, cationic polymer polyols); foaming agents; emulsifiers; fragrances; chelating agents; preservatives (e.g., benzoic acid, sorbic acid, phenoxyethanol); bleaching agents; lubricants; sensory modifiers; sunscreen additives; vitamins; proteins / amino acids; plant extracts; bioactive agents; anti-aging agents; penetrants; antistatic agents; absorbents; hard particles; soft particles; slip agents; pearlescent agents; salts; and mixtures thereof. More preferably, the skin cleansing formulation of the present invention optionally further comprises at least one additional ingredient selected from the group consisting of at least one of the following: antimicrobial agents, rheology modifiers, colorants, and pH adjusters.

[0022] Preferably, the aqueous personal care wash-off composition of the present invention further comprises a rheology modifier. More preferably, the aqueous personal care wash-off formulation of the present invention further comprises a rheology modifier; wherein the rheology modifier is selected to increase the viscosity of the aqueous personal care wash-off composition (preferably without substantially altering other properties of the aqueous personal care wash-off composition). Still more preferably, the aqueous personal care wash-off composition of the present invention further comprises a rheology modifier in an amount of 0% to 10% by weight (preferably, 0.05% to 5% by weight; more preferably, 0.1% to 2.5% by weight; most preferably, 0.15% to 2.0% by weight) based on the weight of the aqueous personal care wash-off composition. More preferably, the aqueous personal care wash-off composition of the present invention further comprises a rheology modifier in an amount of 0% to 10% by weight (preferably, 0.05% to 5% by weight; more preferably, 0.1% to 2.5% by weight; most preferably, 0.15% to 2.0% by weight) based on the weight of the aqueous personal care wash-off composition; wherein the rheology modifier is selected from the group consisting of sodium chloride, cellulose, modified cellulose, xanthan gum, acrylate copolymers, and mixtures thereof. Most preferably, the aqueous personal care wash-off composition of the present invention further comprises a rheology modifier in an amount of 0% to 10% by weight (preferably, 0.05% to 5% by weight; more preferably, 0.1% to 2.5% by weight; most preferably, 0.15% to 2.0% by weight) based on the weight of the aqueous personal care wash-off composition; wherein the rheology modifier includes modified cellulose; wherein the modified cellulose is a quaternized cellulose polymer (e.g., polyquaternium-10).

[0023] Preferably, the aqueous personal care wash-off composition of the present invention further comprises an antimicrobial agent. More preferably, the aqueous personal care wash-off composition of the present invention further comprises an antimicrobial agent; wherein the antimicrobial agent is selected from the group consisting of phenoxyethanol, benzoic acid, benzyl alcohol, sodium benzoate, DMDM ​​hydantoin, 2-ethylhexylglycerin ether, and isothiazolinones (e.g., methylchloroisothiazolinone, methylisothiazolinone). Still more preferably, the aqueous personal care wash-off composition of the present invention further comprises an antimicrobial agent; wherein the antimicrobial agent is an isothiazolinone (more preferably, wherein the antimicrobial agent is selected from the group consisting of methylisothiazolinone, methylchloroisothiazolinone, and mixtures thereof; most preferably, wherein the biocide is methylisothiazolinone). Most preferably, the aqueous personal care wash-off composition of the present invention further comprises an antimicrobial agent; wherein the antimicrobial agent is isothiazolinone (more preferably, wherein the antimicrobial agent is selected from the group consisting of methylisothiazolinone, methylchloroisothiazolinone and mixtures thereof; most preferably, wherein the antimicrobial agent is methylisothiazolinone); and wherein the aqueous personal care wash-off composition is a shower gel formulation.

[0024] Preferably, the aqueous personal care wash-off composition of the present invention further comprises soap. More preferably, the aqueous personal care wash-off composition of the present invention further comprises soap; wherein the soap is selected from the group consisting of sodium stearate, sodium laurate, sodium tallow, sodium palmitate, potassium stearate, potassium laurate, potassium tallow, potassium palmitate, and mixtures thereof. Still more preferably, the aqueous personal care wash-off composition of the present invention further comprises soap; wherein the soap is selected from the group consisting of sodium stearate, sodium laurate, potassium stearate, potassium laurate, and mixtures thereof. Even more preferably, the aqueous personal care wash-off composition of the present invention further comprises soap; wherein the soap is selected from the group consisting of sodium stearate, potassium stearate, and mixtures thereof. Most preferably, the aqueous personal care wash-off composition of the present invention further comprises soap; wherein the soap comprises sodium stearate.

[0025] Preferably, the aqueous personal care wash-off composition of the present invention further comprises soap; wherein the soap is selected from the group consisting of sodium stearate, sodium laurate, sodium tallow, sodium palmitate, potassium stearate, potassium laurate, potassium tallow, potassium palmitate, and mixtures thereof (more preferably, wherein the soap is selected from the group consisting of sodium stearate, sodium laurate, potassium stearate, potassium laurate, and mixtures thereof; still more preferably, wherein the soap is selected from the group consisting of sodium stearate, potassium stearate, and mixtures thereof; most preferably, wherein the soap is sodium stearate); and wherein the aqueous personal care wash-off composition is a shower gel formulation.

[0026] Preferably, the aqueous personal care wash-off composition of the present invention further comprises a pH adjuster. More preferably, the aqueous personal care wash-off composition of the present invention further comprises a pH adjuster; wherein the aqueous personal care wash-off composition is a shower gel formulation. Most preferably, the aqueous personal care wash-off composition of the present invention further comprises a pH adjuster; wherein the aqueous personal care wash-off composition is a shower gel formulation, and wherein the shower gel formulation has a pH of 4.5 to 9 (preferably 5 to 8; most preferably 6 to 7).

[0027] Preferably, the pH adjuster is selected from the group consisting of at least one of the following: citric acid, lactic acid, hydrochloric acid, aminoethylpropylene glycol, triethanolamine, monoethanolamine, sodium hydroxide, potassium hydroxide, and amino-2-methyl-1-propanol. More preferably, the pH adjuster is selected from the group consisting of at least one of the following: citric acid, lactic acid, sodium hydroxide, potassium hydroxide, triethanolamine, and amino-2-methyl-1-propanol. Still more preferably, the pH adjuster includes triethanolamine. Most preferably, the pH adjuster is triethanolamine.

[0028] Preferably, the aqueous personal care wash-off composition of the present invention further comprises a colorant. More preferably, the aqueous personal care wash-off composition of the present invention further comprises a colorant; wherein the aqueous personal care wash-off composition is a shower gel formulation.

[0029] Preferably, the method of cleaning at least one of mammalian skin and hair according to the present invention comprises: applying the aqueous personal care wash-off composition of the present invention to the skin or hair of a mammal; and rinsing the aqueous personal care wash-off composition off the skin or hair with rinsing water.

[0030] Some embodiments of the present invention will now be described in detail in the following examples.

[0031] Comparative Examples CD1-CD4 and Examples D1-D2: Dispersions

[0032] In each of Comparative Examples CD1-CD4 and Examples D1-D2, dispersions were prepared by mixing the components listed in Table 1 in a 300 mL Parr mixing vessel equipped with Cowles mixer blades positioned at the bottom of a 3.5-inch stirring shaft and a pulley system allowing mixer speeds up to 1,825 rpm. The wax, 30% potassium hydroxide solution, inorganic components (if any), and initial water were added to the Parr mixing vessel. The contents of the Parr mixing vessel were then heated with a heating hood set at 140°C. Once the wax had sufficiently softened, stirring was initiated at 150 rpm to promote uniform heating of the vessel contents. Once the vessel contents reached the process temperature of 140°C, the stirring speed was increased to 600 rpm. After 5 minutes, the amount of dilution water listed in Table 1 was added to the vessel. The heating hood was lowered, and the contents of the vessel were cooled to 50°C by immersing the vessel in a cooling water bath while maintaining the stirring speed at 600 rpm. The solids percentage, volume average particle size, and pH of the obtained dispersion product were tested.

[0033] Table 1

[0034]

[0035] Comparative Examples C1-C5 and Examples 1-2: Shower Gel Formulations

[0036] Shower gel formulations were prepared in each of Comparative Examples C1-C5 and Examples 1-2 by mixing the components in the amounts listed in Table 2.

[0037] Table 2

[0038]

[0039]

[0040] Performance testing

[0041] Formulation stability and opacity (L) of the shower gel formulations from each of Comparative Examples C1-C5 and Examples 1-2 * The values ​​are reported in Table 3. Each formulation was filled into 1 mL vials and imaged at room temperature using a Dow PICA IIU High-Throughput (HTR) imaging station. Images were analyzed using the Dow image analysis method in HTR (DiamHTR) version 2.0 in MATLAB. The analysis software was able to process images in batches and integrate the entire area of ​​the sample images to calculate the average L*a*b* color value for each sample. The calculated L* values ​​for each sample are listed in Table 3.

[0042] Table 3

[0043] <![CDATA[ Example ]]> <![CDATA[ L* value ]]> <![CDATA[ Formulation stability ]]> C1 84.2 yes C2 81.5 none C3 97.7 yes C4 88.0 none C5 88.2 none 1 92.5 yes 2 94.9 yes

Claims

1. A water-based personal care wash-off composition, said water-based personal care wash-off composition comprising: The aqueous personal care wash-off composition contains 70% to 85% by weight of a dermatologically acceptable aqueous carrier, wherein the dermatologically acceptable aqueous carrier is water. The aqueous personal care wash-off composition contains 7% to 20% by weight of a dermatologically acceptable cleansing surfactant, wherein the dermatologically acceptable cleansing surfactant is selected from the group consisting of: alkyl polyglucosides, glycine salts, betaine, taurine salts, glutamate salts, sarcosine salts, hydroxyethyl sulfonates, sulfoacetic acid salts, alanine salts, amphoteric acid salts, sulfates, sulfonates, succinates, fatty alkanolamides, and mixtures thereof; and The composition comprises, by weight, 0.75% to 3.0% of a plurality of composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by wax; wherein the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof; wherein the metal oxide particles have a z-average particle size of 175 to 275 nm as measured by dynamic light scattering; wherein the wax has a melting point temperature of 45°C to 110°C; and wherein the composite opacifier particles have a z-average particle size of 300 nm to 500 nm as measured by dynamic light scattering.

2. The aqueous personal care wash-off composition according to claim 1, wherein the aqueous personal care wash-off composition is selected from the group consisting of: shampoos, shower gels, facial cleansers, liquid hand soaps, and mild cleansing agents.

3. The aqueous personal care wash-off composition according to claim 2, wherein the aqueous personal care wash-off composition is selected from the group consisting of: conditioning shampoos, exfoliating body wash formulations, exfoliating facial cleansing formulations, and sulfate-free cleansing formulations.

4. The aqueous personal care wash-off composition according to claim 1, wherein the metal oxide particles are titanium dioxide particles.

5. The aqueous personal care wash-off composition according to claim 4 further comprises a rheology modifier.

6. The aqueous personal care wash-off composition according to claim 5, wherein the wax is a natural wax.

7. The aqueous personal care wash-off composition according to claim 6, wherein the natural wax is derived from the group consisting of: carnauba wax, candelilla wax, myrica wax, castor wax, cogon grass wax, Japanese wax, laurel wax, crown palm wax, palm wax, rice bran wax, soybean wax, sunflower wax, tallow tree wax, and mixtures thereof.

8. The aqueous personal care wash-off composition according to claim 7, wherein the natural wax is carnauba wax.

9. A method for cleaning at least one of mammalian skin and hair, the method comprising: (a) Applying the aqueous personal care wash-off composition according to claim 1 to the skin or hair of a mammal; as well as (b) Rinse the water-based personal care wash-off composition off the skin or hair with rinsing water.

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