PERSONAL CARE RINSE-OFF COMPOSITIONS HAVING COMPOSITE OPACITOR PARTICLES - Patent application

Abstract

Provided is an aqueous personal care rinse-off composition comprising a dermatologically acceptable aqueous vehicle, a dermatologically acceptable cleansing surfactant, and a plurality of composite opacifier particles, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by a wax, the metal oxide particles being selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles having a z-average particle size of greater than 100 nm as measured by dynamic light scattering, the wax having a melting point temperature of from 50 to 110° C., and the composite opacifier particles having a z-average particle size of greater than 100 nm to 2,000 nm as measured by dynamic light scattering.

Description

[Technical field]

[0001] The present invention relates to an aqueous personal care rinse-off composition. Specifically, the present invention relates to an aqueous personal care rinse-off composition comprising a dermatologically acceptable aqueous vehicle, a dermatologically acceptable cleansing surfactant, and a plurality of composite opacifier particles, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by a wax, the metal oxide particles being selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles having a z-average particle size of more than 100 nm as measured by dynamic light scattering, the wax having a melting point temperature of 45-110° C., and the composite opacifier particles having a z-average particle size of more than 100 nm to 2,000 nm as measured by dynamic light scattering.

[0002] In addition to cleaning performance, the aesthetic appearance and feel of a detergent is an important consideration for consumers. Thus, detergents typically contain a variety of ingredients that affect functionality, aesthetics, or both, including, for example, surfactants, solvents, optional builders, and opacifiers.

[0003] Opacifiers are materials that render liquid systems opaque. Thus, opacifiers are used to modify the appearance or aesthetics of detergents, for example, by converting liquids from clear or translucent to opaque. Opacifiers can impart a uniform, luxurious, "lotionized" appearance to liquid products. Opacifiers are usually formed of submicron-sized particles that are delivered to the formulation as a suspension of particles in a solvent, typically water.

[0004] Since opacifiers target the aesthetics of the formulation, it is generally desirable that their inclusion does not interfere with the function of the formulation or otherwise adversely affect the formulation.For example, opacifiers that show limited compatibility with other materials in the formulation are not preferred because they have stability issues and show spotting or residue formation.In addition, opacifiers that introduce a large amount of water into the formulation, for example by only being effective when used in large amounts, are also not preferred, especially for formulations where it is desirable to limit the amount of water, such as concentrated detergents or unit dose packets.

[0005] Thus, there remains a need for more sustainable opacifiers for use in aqueous personal care rinse-off compositions, particularly sustainable opacifiers that perform comparably to traditional styrene acrylic copolymer-based opacifiers.

[0006] The present invention provides an aqueous personal care rinse-off composition comprising a dermatologically acceptable aqueous vehicle, a dermatologically acceptable cleansing surfactant, and a plurality of composite opacifier particles, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by a wax, the metal oxide particles being selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles having a z-average particle size of greater than 100 nm as measured by dynamic light scattering, the wax having a melting point temperature of from 45 to 110° C., and the composite opacifier particles having a z-average particle size of greater than 100 nm to 2,000 nm as measured by dynamic light scattering.

[0007] The present invention provides a method of cleansing at least one of mammalian skin and hair, comprising: (a) applying a personal care rinse-off formulation according to the present invention to the mammalian skin or hair; and (b) rinsing the personal care rinse-off formulation from the skin or hair with rinse water. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present inventors have surprisingly found that composite opacifier particles comprising metal oxide particles partially or completely encapsulated by a wax (preferably a natural wax) can be stably incorporated into aqueous personal care rinse-off compositions to provide opacification comparable to conventional styrene acrylate copolymer-based opacifiers, while increasing the overall sustainability of the aqueous personal care rinse-off composition.

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

[0010] As used herein, unless otherwise indicated, "molecular weight" or M W The phrase refers to weight average molecular weight as measured conventionally using gel permeation chromatography (GPC) and poly(ethylene oxide) standards. The GPC technique is described in detail in Modern Size Exclusion Chromatography, WW Yau, JJ Kirkland, DDBly; Wiley-Interscience, 1979, and in A Guide to Materials Characterization and Chemical Analysis, JP Sibilia; VCH, 1988, p. 81-84. Molecular weights are reported herein in units of Daltons, or equivalently, g / mol.

[0011] The term "dermatologically acceptable" as used herein and in the appended claims refers to ingredients typically used for topical application to the skin, and is intended to emphasize that materials that are toxic when present in amounts typically found in skin care compositions are not contemplated as part of the present invention.

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

[0013] Preferably, the aqueous personal care rinse-off composition of the present invention comprises a dermatologically acceptable aqueous vehicle (preferably, the aqueous personal care rinse-off composition comprises 25 to 99 wt % (preferably, 30 to 95 wt %, more preferably, 40 to 90 wt %, and most preferably, 70 to 85 wt %) of a dermatologically acceptable vehicle based on the weight of the aqueous personal care rinse-off composition), a dermatologically acceptable cleansing surfactant (preferably, the aqueous personal care rinse-off composition comprises 0.5 to 60 wt % (preferably, 1 to 50 wt %, more preferably, 5 to 30 wt %, and most preferably, 7 to 20 wt %) of a dermatologically acceptable cleansing surfactant based on the weight of the aqueous personal care rinse-off composition), and a plurality of composite opacifier particles (preferably, the aqueous personal care rinse-off composition comprises 0.5 to 60 wt % (preferably, 1 to 50 wt %, more preferably, 5 to 30 wt %, and most preferably, 7 to 20 wt %) of a dermatologically acceptable cleansing surfactant based on the weight of the aqueous personal care rinse-off composition). % (preferably 0.1-7.5 wt %, more preferably 0.5-5 wt %, and most preferably 0.75-3.0 wt %) of a plurality of composite opacifier particles, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by wax, the metal oxide particles being selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles having a z-average particle size of greater than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, and most preferably 175 to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer), the wax having a melting point temperature of 45 to 110° C. (preferably 65 to 100° C., more preferably 75 to 90° C., and most preferably 80 to 90° C.), the composite opacifier particles being (e.g., using a Universal The particles have a z-average particle size of greater than 100 nm to 2000 nm (preferably, 200 nm to 1,000 nm, more preferably, 250 nm to 750 nm, and most preferably, 300 nm to 500 nm) as measured by dynamic light scattering (using a Beckman Coulter particle size analyzer equipped with a Liquid Module).

[0014] Preferably, the aqueous personal care rinse-off composition of the present invention comprises a dermatologically acceptable aqueous vehicle. More preferably, the aqueous personal care rinse-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 vehicle based on the weight of the aqueous personal care rinse-off composition. Even more preferably, the aqueous personal care rinse-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 vehicle based on the weight of the aqueous personal care rinse-off composition, the dermatologically acceptable aqueous vehicle comprising water. Even more preferably, the aqueous personal care rinse-off composition of the present invention comprises 25 to 99 wt. % (preferably, 30 to 95 wt. %, more preferably, 40 to 90 wt. %, and most preferably, 70 to 85 wt. %) of a dermatologically acceptable aqueous vehicle, based on the weight of the aqueous personal care rinse-off composition, the dermatologically acceptable aqueous vehicle being water and aqueous C 1~4 Most preferably, the aqueous personal care rinse-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, and most preferably, 70 to 85% by weight) of a dermatologically acceptable aqueous vehicle, based on the weight of the aqueous personal care rinse-off composition, and the dermatologically acceptable aqueous vehicle is water.

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

[0016] Preferably, the aqueous personal care rinse-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 rinse-off composition. More preferably, the aqueous personal care rinse-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 rinse-off composition, and the dermatologically acceptable cleansing surfactant is selected from the group consisting of alkyl polyglucosides (e.g., lauryl glucoside, coco-glucoside, decyl glucoside), glycinates (e.g., sodium cocoyl glycine), betaines (e.g., alkyl betaines such as trimethylglycine and cetyl betaine, and the like). and amidobetaines such as cocamidopropyl betaine), taurates (e.g., sodium methyl cocoyl taurate), glutamates (e.g., sodium cocoyl glutamate), sarcosinates (e.g., sodium lauroyl sarcosine), isethionates (e.g., sodium cocoyl isethionate, sodium lauroyl methyl isethionate), sulfoacetates (e.g., sodium lauryl sulfoacetate), alaninates (e.g., sodium cocoyl alanine), amphoacetates (e.g., sodium cocoamphoacetate), sulfates (e.g., sodium laureth sulfate (SLES)), sulfonates (e.g., sodium laureth sulfate (SLES)), 14~16sodium olefin sulfonate), succinates (e.g., disodium lauryl sulfosuccinate); fatty alkanolamines (e.g., cocamide monoethanolamine, cocamide, diethanolamine, soyamide diethanolamine, lauramide diethanolamine, oleamide monoisopropanolamine, stearamide monoethanolamine, myristamide monoethanolamine, lauramide monoethanolamine, capramide diethanolamine, ricinoleamide diethanolamine, myristamide diethanolamine, stearamide diethanolamine, oleylamide diethanolamine, tallowamide diethanolamine, lauramide monoisopropanolamine, tallowamide monoethanolamine, isostearamide diethanolamine, isostearamide diethanolamine, isostearamide monoethanolamine), and mixtures thereof. Even more preferably, the aqueous personal care rinse-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 rinse-off composition, the dermatologically acceptable cleansing surfactant comprising a mixture of sodium laureth sulfate (SLES) and trimethylglycine. Most preferably, the aqueous personal care rinse-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 rinse-off composition, the dermatologically acceptable cleansing surfactant being a mixture of sodium laureth sulfate (SLES) and trimethylglycine.

[0017] Preferably, the aqueous personal care rinse-off composition of the present invention comprises 0.05 to 10 wt. % (preferably, 0.1 to 7.5 wt. %, more preferably, 0.5 to 5 wt. %, and most preferably, 0.75 to 3 wt. %) of a plurality of composite opacifier particles, based on the weight of the aqueous personal care rinse-off composition, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by wax (preferably, 50 to 100% encapsulated, more preferably, 75 to 100% encapsulated, and most preferably, 90 to 100% encapsulated), the metal oxide particles being The metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles having a z-average particle size of greater than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, and most preferably 175 to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer), the wax has a melting point temperature of 45 to 110°C (preferably 65 to 100°C, more preferably 75 to 90°C, and most preferably 80 to 90°C), and the composite opacifier particles have a z-average particle size of greater than 100 nm to 2000 nm (preferably 200 nm to 1,000 nm, more preferably 250 nm to 750 nm, and most preferably 300 nm to 500 nm) as measured by dynamic light scattering (e.g., using a Beckman Coulter particle size analyzer equipped with a Universal Liquid Module).More preferably, the aqueous personal care rinse-off composition of the present invention comprises 0.05 to 10 wt % (preferably 0.1 to 7.5 wt %, more preferably 0.5 to 5 wt %, most preferably 0.75 to 3 wt %) of a plurality of composite opacifier particles based on the weight of the aqueous personal care rinse-off composition, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by wax (preferably 50 to 100% encapsulated, more preferably 75 to 100% encapsulated, most preferably 90 to 100% encapsulated), the composite opacifier particles comprising 1 to 40 wt % (preferably 2 to 30 wt %, more preferably 3 to 25 wt %, most preferably 5 to 20 wt %) of metal oxide particles based on the weight of the composite opacifier particles, the metal oxide particles being , zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles having a z-average particle size of greater than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, and most preferably 175 to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer), the composite opacifier particles comprise 60 to 99 wt % (preferably 70 to 98 wt %, more preferably 75 to 97 wt %, and most preferably 80 to 95 wt %) of wax based on the weight of the composite opacifier particles, the wax having a melting point temperature of 45 to 110° C. (preferably 65 to 100° C., more preferably 75 to 90° C., and most preferably 80 to 90° C.), the composite opacifier particles being (e.g., using a Universal The particles have a z-average particle size of greater than 100 nm to 2000 nm (preferably, 200 nm to 1,000 nm, more preferably, 250 nm to 750 nm, and most preferably, 300 nm to 500 nm) as measured by dynamic light scattering (using a Beckman Coulter particle size analyzer equipped with a Liquid Module).Most preferably, the aqueous personal care rinse-off composition of the present invention comprises 0.05 to 10 wt. % (preferably 0.1 to 7.5 wt. %, more preferably 0.5 to 5 wt. %, most preferably 0.75 to 3 wt. %) of a plurality of composite opacifier particles based on the weight of the aqueous personal care rinse-off composition, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by wax (preferably 50 to 100% encapsulated, more preferably 75 to 100% encapsulated, most preferably 90 to 100% encapsulated), the composite opacifier particles comprising 1 to 40 wt. % (preferably 2 to 30 wt. %, more preferably 3 to 25 wt. %, most preferably 5 to 20 wt. %) of metal oxide particles based on the weight of the composite opacifier particles, The metal oxide particles are titanium dioxide particles, the titanium dioxide particles having a z-average particle size of greater than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, and most preferably 175 to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer), the composite opacifier particles comprise 60 to 99 wt % (preferably 70 to 98 wt %, more preferably 75 to 97 wt %, and most preferably 80 to 95 wt %) of wax, based on the weight of the composite opacifier particles, the wax having a melting point temperature of 45 to 110° C. (preferably 65 to 100° C., more preferably 75 to 90° C., and most preferably 80 to 90° C.), and the composite opacifier particles are (e.g., using a Universal The particles have a z-average particle size of greater than 100 nm to 2000 nm (preferably, 200 nm to 1,000 nm, more preferably, 250 nm to 750 nm, and most preferably, 300 nm to 500 nm) as measured by dynamic light scattering (using a Beckman Coulter particle size analyzer equipped with a Liquid Module).

[0018] Preferably, the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, and the metal oxide particles have a z-average particle size of greater than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, and most preferably 175 to 275 nm) as measured by dynamic light scattering (e.g., using a Brookhaven particle size analyzer). More preferably, the metal oxide particles comprise titanium dioxide particles having a z-average particle size of greater than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, and most preferably 175 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 greater than 100 nm (preferably from 110 nm to 500 nm, more preferably from 150 nm to 400 nm, most preferably from 175 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, bayberry wax, castor wax, coco butter, esparto wax, laurel wax, Japan wax, jojoba wax, ouricury wax, palm wax, rice bran wax, soy wax, shea butter, sunflower wax, tallow wax, and mixtures thereof. More preferably, the wax is a natural wax selected from the group consisting of carnauba wax, castor wax, ouricury wax, rice bran wax, and mixtures thereof. Even more preferably, the wax is a natural wax including carnauba wax. Most preferably, the wax is carnauba wax.

[0020] Preferably, the wax is C 23~31 Paraffin, C 24~36Fatty alcohol, C 12~36 Fatty acids and C 9~24 Fatty acids and C 12~36 Includes esters derived from fatty alcohols.

[0021] Preferably, the aqueous personal care rinse-off compositions of the present invention optionally contain 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, sorbitan esters, polysorbates (e.g., polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 80), diols (e.g., propylene glycol), and the like. , diol analogs, triols, triol analogs, cationic polymeric 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-degradation additives, penetrating agents, 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 further comprises at least one additional ingredient selected from the group consisting of at least one of antimicrobial agents, rheology modifiers, colorants, and pH adjusters.

[0022] Preferably, the aqueous personal care rinse-off compositions of the present invention further comprise a rheology modifier. More preferably, the aqueous personal care rinse-off formulations of the present invention further comprise a rheology modifier selected to increase the viscosity of the aqueous personal care rinse-off composition (preferably without substantially altering other properties of the aqueous personal care rinse-off composition). Even more preferably, the aqueous personal care rinse-off compositions of the present invention further comprise 0 to 10 wt. % (preferably 0.05 to 5 wt. %, more preferably 0.1 to 2.5 wt. %, most preferably 0.15 to 2.0 wt. %) of a rheology modifier based on the weight of the aqueous personal care rinse-off composition. Even more preferably, the aqueous personal care rinse-off composition of the present invention further comprises 0-10 wt. % (preferably 0.05-5 wt. %, more preferably 0.1-2.5 wt. %, most preferably 0.15-2.0 wt. %) of a rheology modifier based on the weight of the aqueous personal care rinse-off composition, the rheology modifier being selected from the group consisting of sodium chloride, cellulose, modified cellulose, xanthan gum, acrylate copolymers, and mixtures thereof. Most preferably, the aqueous personal care rinse-off composition of the present invention further comprises 0-10 wt. % (preferably 0.05-5 wt. %, more preferably 0.1-2.5 wt. %, most preferably 0.15-2.0 wt. %) of a rheology modifier based on the weight of the aqueous personal care rinse-off composition, the rheology modifier comprising a modified cellulose, the modified cellulose being a quaternized cellulose polymer (e.g., polyquaternium-10).

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

[0024] Preferably, the aqueous personal care rinse-off composition of the present invention further comprises a soap. More preferably, the aqueous personal care rinse-off composition of the present invention further comprises a soap, the soap being selected from the group consisting of sodium stearate, sodium laurate, sodium tallowate, sodium palmitate, potassium stearate, potassium laurate, potassium tallowate, potassium palmitate, and mixtures thereof. Even more preferably, the aqueous personal care rinse-off composition of the present invention further comprises a soap, the soap being selected from the group consisting of sodium stearate, sodium laurate, potassium stearate, potassium laurate, and mixtures thereof. Even more preferably, the aqueous personal care rinse-off composition of the present invention further comprises a soap, the soap being selected from the group consisting of sodium stearate, potassium stearate, and mixtures thereof. Most preferably, the aqueous personal care rinse-off composition of the present invention further comprises a soap, the soap being sodium stearate.

[0025] Preferably, the aqueous personal care rinse-off composition of the present invention further comprises a soap, the soap being selected from the group consisting of sodium stearate, sodium laurate, sodium tallowate, sodium palmitate, potassium stearate, potassium laurate, potassium tallowate, potassium palmitate, and mixtures thereof (more preferably, the soap is selected from the group consisting of sodium stearate, sodium laurate, potassium stearate, potassium laurate, and mixtures thereof, even more preferably, the soap is selected from the group consisting of sodium stearate, potassium stearate, and mixtures thereof, and most preferably, the soap is sodium stearate), and the aqueous personal care rinse-off composition is a body wash formulation.

[0026] Preferably, the aqueous personal care rinse-off composition of the present invention further comprises a pH adjuster. More preferably, the aqueous personal care rinse-off composition of the present invention further comprises a pH adjuster, and the aqueous personal care rinse-off composition is a body wash formulation. Most preferably, the aqueous personal care rinse-off composition of the present invention further comprises a pH adjuster, and the aqueous personal care rinse-off composition is a body wash formulation, and the body wash 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 citric acid, lactic acid, hydrochloric acid, aminoethylpropanediol, 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 citric acid, lactic acid, sodium hydroxide, potassium hydroxide, triethanolamine, and amino-2-methyl-1-propanol. Even more preferably, the pH adjuster includes triethanolamine. Most preferably, the pH adjuster is triethanolamine.

[0028] Preferably, the aqueous personal care rinse-off composition of the present invention further comprises a colorant. More preferably, the aqueous personal care rinse-off composition of the present invention further comprises a colorant and the aqueous personal care rinse-off composition is a body wash formulation.

[0029] Preferably, the method of cleansing at least one of mammalian skin and hair of the present invention comprises applying the aqueous personal care rinse-off composition of the present invention to the mammalian skin or hair and rinsing the aqueous personal care rinse-off composition from the skin or hair with rinse water.

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

[0031] Comparative Examples CD1 to CD4 and Examples D1 to D2: Dispersions In each of Comparative Examples CD1-CD4 and Examples D1-D2, the dispersions were prepared by combining the ingredients set forth in Table 1 in a 300 mL Parr mixing vessel equipped with a Cowles mixer blade located at the bottom of a 3.5 inch long stirring shaft and a pulley system allowing a mixer speed of 1,825 rpm or less. The wax, 30% potassium hydroxide solution, inorganic ingredients (if present), and initial water as set forth in Table 1 were added to the Parr mixing vessel. The contents of the Parr mixing vessel were then heated with a heating mantle set at 140° C. Once the wax was sufficiently softened, stirring was commenced 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 set forth in Table 1 was added to the vessel. The heating mantle was lowered and the vessel contents were cooled to 50° C. by immersing the vessel in a cold water bath while maintaining the stirring speed at 600 rpm. (c) The resulting dispersion products were tested for % solids, volume average particle size, and pH.

[0032] [Table 1] 1 Carnauba wax (C) available from Machado & CIA Inc. 23~31 Paraffin, C 24~36 Fatty alcohol, C 12~36 Fatty acids, C9, C 12~36 ester of 2 IMERCARE® opaque kaolin (Al) having an average particle size of 600 nm available from Imerys Performance Minerals 2 S 2 O 5 (OH) 4 ) 3 TI-PURE™ R-104 TiO with a mean particle size of 220 nm with a hydrophobic coating available from Chemours 2 4 TI-PURE™ R-101 TiO with a mean particle size of 290 nm and a hydrophilic coating available from Chemours 2 * Multiple peaks were observed

[0033] Comparative Examples C1-C5 and Examples 1-2: Body Wash Formulations In each of Comparative Examples C1-C5 and Examples 1-2, a body wash formulation was prepared by combining the ingredients in the amounts listed in Table 2.

[0034] [Table 2] 1 Sodium Laureth Sulfate (SLES) available from Sigma Aldrich 2 Trimethylglycine available from Sigma-Aldrich 3 UCARE™ Polymer JR-400 Polyquaternium-10 available from The Dow Chemical Company 4 ACUSOL(TM) OP301 Opacifier 5 Separately added was a carnauba wax dispersion (Product CD1, 0.98 g) and TI-PURE® R-104 TiO with a mean particle size of 220 nm and a hydrophobic coating. 2 (0.02 g; available from Chemours)

[0035] Performance Testing Formulation stability and opacity (L *The results of the measurements (values) are reported in Table 3. Each formulation was filled into a 1 mL vial and imaged at room temperature by a Dow PICA IIU High Throughput (HTR) Imaging Station. Images were analyzed using Dow image Analysis Methods for HTR (DiamHTR) Version 2.0 in MATLAB. The analysis software batch processed the images, integrated the entire area of ​​the sample images, and calculated the average L for each sample. * a * b * The color values ​​could be calculated. * The values ​​are listed in Table 3.

[0036] [Table 3]

Claims

1. 1. An aqueous personal care rinse-off composition comprising: a dermatologically acceptable aqueous vehicle; a dermatologically acceptable cleansing surfactant; a plurality of composite opacifier particles; Including, 1. An aqueous personal care rinse-off composition, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by a wax, the metal oxide particles being selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles having a z-average particle size of greater than 100 nm as measured by dynamic light scattering, the wax having a melting point temperature of 45 to 110° C., and the composite opacifier particles having a z-average particle size of greater than 100 nm to 2,000 nm as measured by dynamic light scattering.

2. 10. The aqueous personal care rinse-off composition of claim 1, selected from the group consisting of shampoos, conditioning shampoos, body wash formulations, exfoliating body wash formulations, facial wash formulations, exfoliating facial wash formulations, liquid hand soap formulations, sulfate-free cleaning formulations, and mild cleansing formulations.

3. 3. The aqueous personal care rinse-off composition of claim 2, wherein said dermatologically acceptable aqueous vehicle comprises water, based on weight of said dermatologically acceptable aqueous vehicle.

4. 4. The aqueous personal care rinse-off composition of claim 3, wherein the dermatologically acceptable cleansing surfactant is selected from the group consisting of alkyl polyglucosides, glycinates, betaines, taurates, glutamates, sarcosinates, isethionates, sulfoacetates, alaninates, amphoacetates, sulfates, sulfonates, succinates, fatty alkanolamides, and mixtures thereof.

5. 5. The aqueous personal care rinse-off composition of claim 4, wherein said metal oxide particles are titanium dioxide particles.

6. 6. The aqueous personal care rinse-off composition of claim 5, further comprising a rheology modifier.

7. 7. The aqueous personal care rinse-off composition of claim 6, wherein said wax is a natural wax.

8. 8. The aqueous personal care rinse-off composition of claim 7, wherein the natural wax is from the group consisting of carnauba wax, candelilla wax, bayberry wax, castor wax, coco butter, esparto wax, Japan wax, jojoba wax, laurel wax, ouricle wax, palm wax, rice bran wax, soy wax, sunflower wax, shea butter, tallow wax, and mixtures thereof.

9. 9. The aqueous personal care rinse-off composition of claim 8, wherein said natural wax is carnauba wax.

10. 1. A method for cleansing at least one of mammalian skin and hair, comprising: (a) applying the aqueous personal care rinse-off composition of claim 1 to mammalian skin or hair; (b) rinsing the aqueous personal care rinse-off composition from the skin or hair with rinse water; A method comprising: