Complex emulsion dispersion

Abstract

Provided is a composite opacifier dispersion comprising a dispersion medium, a processing surfactant, and a plurality of composite opacifier particles, the composite opacifier particles comprising metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, 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, and the composite opacifier particles having a z-average particle size of greater than 150 nm to 2,500 nm as measured by dynamic light scattering.

Description

Technical Field

[0001] The present invention relates to a composite opacifier dispersion, which is a composite opacifier dispersion comprising a dispersion medium, a processing surfactant, and a plurality of composite opacifier particles. The composite opacifier particles contain metal oxide particles partially or completely encapsulated by a polycaprolactone polymer. The metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof. The metal oxide particles have a z-average particle size of more than 100 nm when measured by dynamic light scattering. The composite opacifier particles have a z-average particle size of more than 150 nm to 2,500 nm when measured by dynamic light scattering.

[0002] In addition to cleaning performance, the aesthetic appearance and feel of detergents are important considerations for consumers. Therefore, detergents typically contain various formulation components that affect functionality, aesthetics, or both, such as surfactants, solvents, optionally builders, and opacifiers.

[0003] An opacifier is a material that makes a liquid system opaque. Therefore, opacifiers are used to modify the appearance or aesthetics of detergents, for example, by converting a liquid from transparent or translucent to opaque. Opacifiers can provide a uniform and premium "lotionized" appearance to liquid products. Opacifiers are usually formed from 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 have an adverse effect on the formulation. For example, opacifiers that exhibit limited compatibility with other materials in the formulation have stability problems, show spotting or residue formation, and are undesirable. In addition, opacifiers that introduce a large amount of water into the formulation, for example, by being effective only when used in large amounts, are also undesirable in formulations where it is desirable to limit the amount of water, especially in concentrated detergents or unit-dose packets.

[0005] Therefore, a more sustainable opacifier for use in aqueous personal care rinse-off compositions, and in particular, the sustainable opacifier functions equivalently to conventional styrene-acrylic copolymer-based opacifiers.

[0006] The present invention provides a composite opacifier dispersion comprising a dispersion medium, a processed surfactant, and a plurality of composite opacifier particles, wherein the composite opacifier particles include metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide, and mixtures thereof, the metal oxide particles have a z-average particle size greater than 100 nm when measured by dynamic light scattering, and the composite opacifier particles have a z-average particle size greater than 150 nm to 2,500 nm when measured by dynamic light scattering.

[0007] The present invention provides an aqueous personal care rinse-off composition comprising a dermatologically acceptable aqueous vehicle, a dermatologically acceptable cleansing surfactant, a dispersion medium, a processing surfactant, and a plurality of composite opacifier particles, wherein the composite opacifier particles include metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, 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 greater than 100 nm when measured by dynamic light scattering, and the composite opacifier particles having a z-average particle size greater than 150 nm to 2,500 nm when measured by dynamic light scattering.

[0008] The present invention provides a method for washing at least one of the skin and hair of a mammal, comprising: (a) applying an aqueous personal care rinse-off formulation according to the present invention to the skin or hair of the mammal; and (b) rinsing the aqueous personal care rinse-off formulation from the skin or hair with rinse water. [Modes for carrying out the invention]

[0009] The inventors have surprisingly found that a composite opacifier dispersion containing metal oxide particles partially or completely encapsulated by a polycaprolactone polymer can be stably incorporated into an aqueous personal care rinse-off composition, thereby achieving opacity comparable to that of conventional styrene acrylate copolymer-based opacifiers while increasing the overall sustainability of the aqueous personal care rinse-off composition.

[0010] Unless otherwise specified, ratios, percentages, and parts are expressed by weight.

[0011] Where used herein, unless otherwise specified, "molecular weight" or M W The term refers to weight-average molecular weight measured by conventional methods using gel permeation chromatography (GPC) and poly(ethylene oxide) standards. The GPC technique is described in detail in *Modern Size Exclusion Chromatography*, WWYau, JJKirkland, DDBly; Wiley-Interscience, 1979, and in *A Guide to Materials Characterization and Chemical Analysis*, JPSibilia; VCH, 1988, pp. 81-84. Molecular weight is reported herein in units of Daltons or equivalently in g / mol.

[0012] As used herein and in the appendices, the term “dermatologically acceptable” refers to ingredients typically used for topical application to the skin, and it is intended to emphasize that materials that are toxic when present in amounts typically found in skincare compositions are not intended as part of the present invention.

[0013] Preferably, the complex emulsion dispersion of the present invention comprises a dispersion medium (preferably 25-90% by weight (more preferably 40-85% by weight, even more preferably 50-80% by weight, most preferably 60-75% by weight) of the dispersion medium based on the weight of the complex emulsion dispersion), a processing surfactant (preferably 0.1-15% by weight (more preferably 0.4-9% by weight, even more preferably 0.6-5% by weight, most preferably 1.25-4% by weight) of the processing surfactant based on the weight of the complex emulsion dispersion), and a plurality of complex emulsion particles (preferably 9.9- The compound comprises 60% by weight (more preferably 14.6 to 59.6% by weight, even more preferably 19.4 to 49.4% by weight, most preferably 23.75 to 36% by weight of multiple composite opacifier particles), wherein the composite opacifier particles include metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, 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 greater than 100 nm when measured by dynamic light scattering, and the composite opacifier particles having a z-average particle size greater than 150 nm to 2500 nm (preferably 200 nm to 2000 nm), more preferably 500 nm to 1800 nm, most preferably 750 nm to 1600 nm) when measured by dynamic light scattering (e.g., using a Beckman Coulter particle size analyzer with a universal liquid module).

[0014] Preferably, the complex opacifier dispersion of the present invention contains 25 to 90% by weight (preferably 40 to 85% by weight, more preferably 50 to 80% by weight, most preferably 60 to 75% by weight) of a dispersion medium based on the weight of the complex opacifier dispersion. More preferably, the complex opacifier dispersion of the present invention contains 25 to 90% by weight (preferably 40 to 85% by weight, more preferably 50 to 80% by weight, most preferably 60 to 75% by weight) of a dispersion medium based on the weight of the complex opacifier dispersion, wherein the dispersion medium is water. Most preferably, the complex opacifier dispersion of the present invention contains 25 to 90% by weight (preferably 40 to 85% by weight, more preferably 50 to 80% by weight, most preferably 60 to 75% by weight) of a dispersion medium based on the weight of the complex opacifier dispersion, wherein the dispersion medium is water (preferably, the water is at least one of distilled water and deionized water).

[0015] Preferably, the complex emulsion dispersion of the present invention contains 0.1 to 15% by weight (preferably 0.4 to 9% by weight, more preferably 0.6 to 5% by weight, most preferably 1.25 to 4% by weight) of a modified surfactant based on the weight of the complex emulsion dispersion. More preferably, the complex emulsion dispersion of the present invention contains 0.1 to 15% by weight (preferably 0.4 to 9% by weight, more preferably 0.6 to 5% by weight, most preferably 1.25 to 4% by weight) of a modified surfactant based on the weight of the complex emulsion dispersion, the modified surfactant being selected from the group consisting of ionic surfactants, nonionic surfactants, and cationic surfactants. Most preferably, the complex emulsion dispersion of the present invention contains 0.1 to 15% by weight (preferably 0.4 to 9% by weight, more preferably 0.6 to 5% by weight, most preferably 1.25 to 4% by weight) of a modified surfactant based on the weight of the complex emulsion dispersion, wherein the modified surfactant is a nonionic surfactant (preferably the nonionic surfactant has a weight-average molecular weight of 5,000 to 150,000 daltons (preferably 5,000 to 100,000 daltons, more preferably 7,500 to 50,000 daltons, most preferably 10,000 to 25,000 daltons)).

[0016] Preferably, the complex emulsion dispersion of the present invention comprises 0.1 to 15% by weight (preferably 0.4 to 9% by weight, more preferably 0.6 to 5% by weight, most preferably 1.25 to 4% by weight) of a modified surfactant based on the weight of the complex emulsion dispersion, wherein the modified surfactant is a nonionic surfactant selected from the group consisting of polyoxyalkylene surfactants, polyalkylene glycol esters, polyoxyethylene derivatives of fatty acid esters of polyhydric alcohols, fatty acid esters of polyalkoxylated polyhydric alcohols, polyalkoxylated natural oils and fats, polyalkylene oxide block copolymers, alkyl polyglucosides, sucrose esters, and mixtures thereof (preferably, the nonionic surfactant has a weight-average molecular weight of 5,000 to 150,000 daltons (preferably 5,000 to 100,000 daltons, more preferably 7,500 to 50,000 daltons, most preferably 10,000 to 25,000 daltons)). More preferably, the composite emulsion dispersion of the present invention comprises 0.1 to 15% by weight (preferably 0.4 to 9% by weight, more preferably 0.6 to 5% by weight, most preferably 1.25 to 4% by weight) of a processing surfactant based on the weight of the composite emulsion dispersion, and is a processing surfactant and a poly(alkylene oxide) polymer (preferably the poly(alkylene oxide) polymer has a weight-average molecular weight of 5,000 to 150,000 daltons (preferably 5,000 to 100,000 daltons, more preferably 7,500 to 50,000 daltons, most preferably 10,000 to 25,000 daltons)). More preferably, the complex opacifier dispersion of the present invention comprises 0.1 to 15% by weight (more preferably 0.4 to 9% by weight, more preferably 0.6 to 5% by weight, most preferably 1.25 to 4% by weight) of a processing surfactant based on the weight of the complex opacifier dispersion, wherein the processing surfactant is a poly(alkylene oxide) copolymer containing ethylene oxide (EO) and propylene oxide (PO) residues (preferably, the nonionic surfactant has a weight-average molecular weight of 5,000 to 150,000 daltons (preferably 5,000 to 100,000 daltons, more preferably 7,500 to 50,000 daltons, most preferably 10,000 to 25,000 daltons)).Most preferably, the complex emulsion dispersion of the present invention comprises 0.1 to 15% by weight (preferably 0.4 to 9% by weight, more preferably 0.6 to 5% by weight, most preferably 1.25 to 4% by weight) of a processing surfactant based on the weight of the complex emulsion dispersion, wherein the processing surfactant is an ABA-type triblock copolymer of ethylene oxide (EO) (block A) and propylene oxide (PO) (block B) (preferably the ABA-type triblock copolymer has a weight-average molecular weight of 5,000 to 150,000 daltons (preferably 5,000 to 100,000 daltons, more preferably 7,500 to 50,000 daltons, most preferably 10,000 to 25,000 daltons)).

[0017] Preferably, the complex emulsion dispersion of the present invention contains 9.9 to 60% by weight (preferably 14.6 to 59.6% by weight, more preferably 19.4 to 49.4% by weight, and most preferably 23.75 to 36% by weight) of a plurality of complex emulsion particles based on the weight of the complex emulsion dispersion. More preferably, the composite opacifier dispersion of the present invention comprises a plurality of composite opacifier particles in an amount of 9.9 to 60% by weight (preferably 14.6 to 59.6% by weight, more preferably 19.4 to 49.4% by weight, most preferably 23.75 to 36% by weight) based on the weight of the composite opacifier dispersion, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide and mixtures thereof, the metal oxide particles have a z-average particle size greater than 100 nm when measured by dynamic light scattering, and the composite opacifier particles are encapsulated by dynamic light scattering (e.g., Beckman with a universal liquid module). When measured using a Coulter particle size analyzer, the z-average particle size is greater than 150 nm to 2500 nm (preferably 200 nm to 2000 nm), more preferably 500 nm to 1800 nm, and most preferably 750 nm to 1600 nm.

[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 more than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, most preferably 175 nm to 275 nm) when measured by dynamic light scattering (for example, using a Brookhaven particle size analyzer). The metal oxide particles include titanium dioxide particles having a z-average particle size of more than 100 nm (preferably 110 nm to 500 nm, more preferably 150 nm to 400 nm, most preferably 175 nm to 275 nm) when measured by dynamic light scattering (for example, using a Brookhaven particle size analyzer). Most preferably, the metal oxide particles are titanium dioxide particles having a z-average particle size of more than 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 (for example, using a Brookhaven particle size analyzer).

[0019] Preferably, the metal oxide particles have a hydrophobic surface treatment (e.g., a polysiloxane surface coating).

[0020] Preferably, the polycaprolactam polymer has a weight-average molecular weight of 10,000 to 1,000,000 daltons (preferably 25,000 to 250,000 daltons, more preferably 50,000 to 150,000 daltons, and most preferably 75,000 to 125,000 daltons).

[0021] Preferably, the aqueous personal care rinse-off composition of the present invention is selected from the group consisting of shampoo formulations, conditioning shampoo formulations, 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, shampoo formulations, and conditioning shampoo formulations. Most preferably, the aqueous personal care rinse-off composition of the present invention is a shampoo formulation.

[0022] 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 contains 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) and a dermatologically acceptable cleansing surfactant (preferably, the aqueous personal care rinse-off composition contains 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 aqueous personal care rinse-off composition comprises a plurality of composite opacifier particles (preferably, the aqueous personal care rinse-off composition contains 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 3.0% by weight) based on the weight of the aqueous personal care rinse-off composition), wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, 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 greater than 100 nm when measured by dynamic light scattering, and the composite opacifier particles being encapsulated by dynamic light scattering (e.g., Beckman with a universal liquid module) When measured using a Coulter particle size analyzer, the z-average particle size is greater than 150 nm to 2500 nm (preferably 200 nm to 2000 nm), more preferably 500 nm to 1800 nm, and most preferably 750 nm to 1600 nm.

[0023] Preferably, the aqueous personal care rinse-off composition of the present invention contains 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. More preferably, the aqueous personal care rinse-off composition of the present invention contains 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, wherein the dermatologically acceptable aqueous vehicle includes water. Even more preferably, the aqueous personal care rinse-off composition of the present invention contains 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, wherein the dermatologically acceptable aqueous vehicle includes water and aqueous C 1~4 The alcohol mixture is selected from the group consisting of alcohol mixtures. 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, 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, wherein the dermatologically acceptable aqueous vehicle is water.

[0024] Preferably, the water used in the aqueous personal care rinse-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 rinse-off composition of the present invention is distilled and deionized.

[0025] Preferably, the aqueous personal care rinse-off composition of the present invention contains 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 contains 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, wherein the dermatologically acceptable cleansing surfactant is an alkyl polyglucoside (e.g., lauryl glucoside, coco-glucoside, decyl glucoside), glycinate (e.g., sodium cocoyl glycinate), betaine (e.g., alkyl betaines such as trimethylglycine and cetyl betaine, etc.), (including amide betaines such as cocamidopropyl betaine), taurates (e.g., sodium methylcocoyl taurate), glutamates (e.g., sodium cocoyl glutamate), sarcosinates (e.g., sodium lauroyl sarcosinate), isethionates (e.g., sodium cocoyl isethionate, sodium lauroyl methyl isethionate), sulfoacetates (e.g., sodium lauryl sulfoacetate), alaninates (e.g., sodium cocoyl alanine), amfoacetates (e.g., sodium cocoamphoacetate), sulfates (e.g., sodium laureth sulfate (SLES)), sulfonates (e.g., C 14~16Selected from the group consisting of sodium olefin sulfonate, succinates (e.g., disodium lauryl sulfosuccinate); aliphatic alkanolamides (e.g., cocamide monoethanolamine, cocamide, diethanolamine, soyamide diethanolamine, lauramido diethanolamine, oleamide monoisopropanolamine, stearamide monoethanolamine, myristamide monoethanolamine, lauramido monoethanolamine, capramido diethanolamine, ricinoleamide diethanolamine, myristamide diethanolamine, stearamide diethanolamine, oleylamide diethanolamine, tarouamide diethanolamine, lauramido monoisopropanolamine, tarouamide monoethanolamine, isostearamido diethanolamine, isostearamido diethanolamine, isostearamido diethanolamine, isostearamido monoethanolamine), and mixtures thereof. More preferably, the aqueous personal care rinse-off composition of the present invention contains 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, wherein the dermatologically acceptable cleansing surfactant comprises a mixture of sodium laureth sulfate (SLES) and cocamidopropyl betaine. Most preferably, the aqueous personal care rinse-off composition of the present invention contains 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, wherein the dermatologically acceptable cleansing surfactant is a mixture of sodium laureth sulfate (SLES) and cocamidopropyl betaine.

[0026] Preferably, the aqueous personal care rinse-off composition of the present invention optionally contains an antimicrobial agent, a rheological modifier, a soap, a colorant, a pH adjuster, an antioxidant (e.g., butylated hydroxytoluene), a humectant (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), a diol (e.g., propylene glycol), or a diol. The present invention further comprises at least one additional component selected from the group consisting of triols, 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, degradation inhibitors, penetrating agents, antistatic agents, absorbents, hard particles, soft particles, lubricants, pearlescent agents, salts (e.g., moisturizing salts), and mixtures thereof. More preferably, the skin cleansing formulation of the present invention further optionally comprises at least one additional component selected from the group consisting of at least one antimicrobial agent, rheological modifier, colorant, and pH adjuster.

[0027] Preferably, the aqueous personal care rinse-off composition of the present invention further comprises a rheology modifier. More preferably, the aqueous personal care rinse-off formulation of the present invention further comprises a rheology modifier, and the rheology modifier is selected to increase the viscosity of the aqueous personal care rinse-off composition (preferably, without substantially modifying other properties 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 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) 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 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) of a rheology modifier based on the weight of the aqueous personal care rinse-off composition, and the rheology modifier is selected from the group consisting of sodium chloride, cellulose, modified cellulose, xanthan gum, acrylate copolymer, and mixtures thereof. Most preferably, the aqueous personal care rinse-off composition of the present invention further comprises 0 to 10% by weight (preferably, 0.05 to 5% by weight, more preferably, 0.1 to 4% by weight, most preferably, 0.15 to 3.5% by weight) of a rheology modifier based on the weight of the aqueous personal care rinse-off composition, and the rheology modifier comprises sodium chloride.

[0028] Preferably, the aqueous personal care rinse-off composition of the present invention further comprises an antibacterial agent. More preferably, the aqueous personal care rinse-off composition of the present invention further comprises an antibacterial agent, and the antibacterial agent is selected from the group consisting of phenoxyethanol, benzoic acid, benzyl alcohol, sodium benzoate, DMDM hydantoin, 2-ethylhexyl glyceryl ether, isothiazolinone (e.g., methylchloroisothiazolinone, methylisothiazolinone), and mixtures thereof. Even more preferably, the aqueous personal care rinse-off composition of the present invention further comprises an antibacterial agent, and the antibacterial agent comprises at least one of phenoxyethanol and 2-ethylhexyl glyceryl ether. Most preferably, the aqueous personal care rinse-off composition of the present invention further comprises an antibacterial agent, and the antibacterial agent is a mixture of phenoxyethanol and 2-ethylhexyl glyceryl ether.

[0029] 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, 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). 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.

[0030] Preferably, the aqueous personal care rinse-off composition of the present invention further comprises a colorant.

[0031] Preferably, a method of the present invention for washing at least one of mammalian skin and hair, comprising 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 and / or hair with rinse water. More preferably, a method of the present invention for washing at least one of human skin and hair, comprising 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 and / or hair with rinse water.

[0032] Herein, several embodiments of the present invention will be described in detail by the following examples.

[0033] The reagents used in the examples are listed in Table 1. [Table 1]

[0034] Synthetic S1: Polycaprolactone / TiO2 composite In synthesis S1, polycaprolactone (CAPA® 6500) and TiO2 (Kronos R2233) were pre-mixed in a Leistritz ZSE27 MAXX twin-screw extruder. Polycaprolactone pellets were fed into the extruder at a rate of 12 kg / hour through the feed port. TiO2 was fed into the extruder at a rate of 1.2 kg / hour through the side arm of the fifth barrel. The extruder temperature was set to 100°C and the screw speed to 300 rpm. The extruded material was cut into masterbatch pellets using a strand pelletizer and recovered.

[0035] Comparative Examples C1-C5 and Examples 1-2: Aqueous emulsion dispersions Aqueous opacifier dispersions were prepared in Comparative Examples C1-C5 and Examples 1-2 using a Coperion ZSK26 twin-screw extruder. Polycaprolactone or polycaprolactone / TiO2 composite master pellets shown in Table 1 were fed into the extruder at a rate of 4.2 kg / hour through the feed port, along with the processing surfactant at the rates shown in Table 1. Deionized water was injected into the fourth barrel of the extruder at a rate of 0.42 kg / hour. A second stream of deionized water was injected into the extruder at a rate of 4.2 kg / hour through the ninth barrel. The extruder temperature was set to 100°C and the screw speed to 400 rpm. The resulting aqueous opacifier dispersion was recovered at the extruder outlet and used as is. In Comparative Examples C2 and C3, the opacifier particles did not disperse in the aqueous medium.

[0036] The Dv50 particle size of the dispersed opaque particles in Comparative Examples C1, C4-C5 and Examples 1-2 was measured by dynamic light scattering using a Beckman LS230 particle size analyzer. The results are shown in Table 1. [Table 2]

[0037] Comparative Examples CF1-CF5 and Examples F1-F2: Shampoo Formulations In each of the Comparative Examples CF1-CF5 and Examples F1-F2, shampoo formulations were prepared by combining the amounts of ingredients listed in Table 2. [Table 3]

[0038] Performance testing The opacity of shampoo formulations from Comparative Examples CF1-CF5 and Examples F1-F2 was analyzed by adding a 3 mL sample of each shampoo formulation to a separate 5 mL glass bottle. The bottle was then placed on a fixed holder in front of the camera. The opacity of the shampoo formulations was tested using PICA II (Phase Identification and Characterization Apparatus). Photographs were taken in a frontal view under consistent lighting conditions. The gray values ​​were calibrated from 0 to 255, with higher values ​​corresponding to higher opacity. The gray values ​​for each sample are listed in Table 3. [Table 4] The present invention encompasses the following aspects. [1] A complex emulsion dispersion, Distributed media and Processed surfactants and A composite opacifier dispersion comprising a plurality of composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, 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 greater than 100 nm when measured by dynamic light scattering, and the composite opacifier particles having a z-average particle size greater than 150 nm to 2,500 nm when measured by dynamic light scattering. [2] A water-based personal care rinse-off composition, A dermatologically acceptable aqueous vehicle, Dermatologically acceptable cleansing surfactants, An aqueous personal care rinse-off composition comprising the complex milky agent dispersion described in Embodiment 1. [3] An aqueous personal care rinse-off composition according to Embodiment 2, selected from the group consisting of shampoo, conditioning shampoo, body wash formulation, exfoliating body wash formulation, facial wash formulation, exfoliating facial wash formulation, liquid hand soap formulation, sulfate-free cleansing formulation, and mild cleansing formulation. [4] The aqueous personal care rinse-off composition according to embodiment 3, wherein the dermatologically acceptable cleansing surfactant is selected from the group consisting of alkyl polyglucoside, glycinate, betaine, taurate, glutamate, sarcosinate, isethionate, sulfoacetate, alaninate, amfoacetate, sulfate, sulfonate, succinate, fatty alkanolamide, and mixtures thereof. [5] The aqueous personal care rinse-off composition according to embodiment 4, wherein the metal oxide particles are titanium dioxide particles. [6] The aqueous personal care rinse-off composition according to embodiment 5, further comprising a rheological modifier. [7] The aqueous personal care rinse-off composition according to embodiment 6, wherein the polycaprolactone polymer has a weight-average molecular weight of 10,000 to 1,000,000 daltons. [8] The aqueous personal care rinse-off composition according to embodiment 6, wherein the polycaprolactone polymer has a weight-average molecular weight of 20,000 to 200,000 daltons. [9] The aqueous personal care rinse-off composition according to embodiment 6, wherein the polycaprolactone polymer has a weight-average molecular weight of 25,000 to 150,000 daltons.

[10] A method for washing at least one of the skin and hair of a mammal, (a) Applying the aqueous personal care rinse-off composition described in Embodiment 2 to the skin or hair of a mammal, (b) Rinse the aqueous personal care rinse-off composition off the skin or hair with rinse water. Methods that include...

Claims

1. A complex emulsion dispersion, Distributed media and Processed surfactants and A composite opacifier dispersion comprising a plurality of composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles partially or completely encapsulated by a polycaprolactone polymer, 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 150 nm to 400 nm as measured by dynamic light scattering, and the composite opacifier particles having a z-average particle size of 750 nm to 1,600 nm as measured by dynamic light scattering.

2. A water-based personal care rinse-off composition, A dermatologically acceptable aqueous vehicle, Dermatologically acceptable cleansing surfactants, An aqueous personal care rinse-off composition comprising the complex milky agent dispersion described in claim 1.

3. An aqueous personal care rinse-off composition according to claim 2, selected from the group consisting of shampoo, conditioning shampoo, body wash formulation, exfoliating body wash formulation, facial wash formulation, exfoliating facial wash formulation, liquid hand soap formulation, sulfate-free cleansing formulation, and mild cleansing formulation.

4. The aqueous personal care rinse-off composition according to claim 3, wherein the dermatologically acceptable cleansing surfactant is selected from the group consisting of alkyl polyglucoside, glycinate, betaine, taurate, glutamate, sarcosinate, isethionate, sulfoacetate, alaninate, amfoacetate, sulfate, sulfonate, succinate, fatty alkanolamide, and mixtures thereof.

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

6. The aqueous personal care rinse-off composition according to claim 5, further comprising a rheological modifier.

7. The aqueous personal care rinse-off composition according to claim 6, wherein the polycaprolactone polymer has a weight-average molecular weight of 10,000 to 1,000,000 daltons.

8. The aqueous personal care rinse-off composition according to claim 6, wherein the polycaprolactone polymer has a weight-average molecular weight of 20,000 to 200,000 daltons.

9. The aqueous personal care rinse-off composition according to claim 6, wherein the polycaprolactone polymer has a weight-average molecular weight of 25,000 to 150,000 daltons.

10. A method for washing at least one of the skin and hair of a mammal, (a) Applying the aqueous personal care rinse-off composition described in claim 2 to the skin or hair of a mammal, (b) Rinsing the aqueous personal care rinse-off composition from the skin or hair with rinse water, Methods that include...

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