Oil-Compatible Mineral Pigment Composition Compatible with Water

Abstract

The present invention relates to a powder composition comprising composite particles showing an inorganic core, a hydrophobic coating composition and a hydrophilic coating composition, wherein the hydrophilic coating composition contains 20% to 60% by weight of hydroxypropylmethylcellulose based on the total weight of the microcrystalline cellulose and the hydrophilic composition. The present invention further relates to a process for obtaining such a powder composition and a cosmetic composition comprising said powder composition.

Description

Technical Field

[0001] The present invention relates to a composition containing surface-treated mineral particles and a cosmetic composition containing the same. In particular, the present invention relates to powders having hydrophobic and hydrophilic surface treatments, cosmetic compositions containing such powders, and cosmetic compositions having good dispersibility in an aqueous medium and advantageous sensory properties while maintaining a dry feel and sebum resistance.

Background Art

[0002] Friction and oily skin secretions are external factors that deteriorate the durability of pigment compositions in skin products. Since the surfaces of metal oxide pigments such as titanium oxide or iron oxide are hydrophilic, they tend not to adhere well to the skin and tend to run off the skin when used as they are. Therefore, in order to improve their cosmetic durability, pigment compositions are surface-treated with a hydrophobic composition to protect them with a hydrophobic coating.

[0003] To impart hydrophobicity, the surfaces of the particles are treated before their use by means of forming a hydrophobic coating to make them more hydrophobic. Typical hydrophobic coatings reported in the art include silicone-based surface coating compositions and coatings in which amino acids are substituted with fatty acids. However, such coated particles have low washability with water due to their high water repellency. Also, the coated particles tend to form particle aggregates, so they are not easily dispersed during the manufacture of cosmetic formulations or on the skin, thereby causing negative sensory perceptions during their use.

[0004] Furthermore, the hydrophobic-coated pigment particles cannot be incorporated into a stable aqueous dispersion because their hydrophobic properties cause them to phase-separate into a two-phase system. Therefore, the hydrophobic-coated pigment particles can only be incorporated into cosmetic emulsions.

[0005] Accordingly, there is a great demand for providing a pigment composition that addresses the above drawbacks, particularly a pigment composition that does not form aggregates on the skin or in cosmetic formulations and can be incorporated into an aqueous dispersion while maintaining good sensory properties.

[0006] The powder composition containing composite particles according to the present invention addresses the above technical problems by maintaining the lipophilic properties of the particles towards the skin while maintaining their dispersibility in an aqueous medium. Advantageously, the composition enables the use of components that are readily available in the cosmetics market.

Summary of the Invention

[0007] The present invention relates to a powder composition comprising composite particles exhibiting an inorganic core, a hydrophobic coating composition, and a hydrophilic coating composition, wherein the hydrophilic composition typically comprises 20% to 60% by weight of hydroxypropyl methylcellulose, in combination with microcrystalline cellulose, based on the total weight of the hydrophilic composition.

[0008] According to some embodiments, the coating of the hydrophilic composition coats the coating of the hydrophobic coating composition.

[0009] In some embodiments, the powder composition according to the present invention comprises, by weight, based on the total weight of the powder composition · 0.5% to 15%, preferably 1% to 12% of the hydrophobic coating composition, · 0.5% to 10%, preferably 3% to 8% of the hydrophilic coating composition and.

[0010] In some embodiments, the microcrystalline cellulose is present in an amount in the range of 5% to 25% by weight based on the total weight of the hydrophilic composition.

[0011] In some embodiments, the hydrophilic coating composition further comprises an inorganic filler selected from the group consisting of magnesium carbonate, calcium carbonate, titanium dioxide, silica, silica beads, mica, talc, sericite, and mixtures thereof, in an amount of 15% to 40% by weight based on the hydrophilic composition, and preferably the inorganic filler is magnesium carbonate.

[0012] In some embodiments, the hydrophilic composition is by weight based on the total weight of the hydrophilic composition · 30% to 55%, preferably 45% to 55% hydroxypropyl methylcellulose, · 5% to 25%, preferably 8% to 12% microcrystalline cellulose, and · 15% to 40%, preferably 25% to 35% magnesium carbonate and contains.

[0013] The hydrophilic composition may further contain at least one triglyceride, hydroxypropyl cellulose, or a mixture thereof.

[0014] Therefore, in some embodiments, the hydrophilic composition is by weight based on the total weight of the hydrophilic composition · 45% to 55% hydroxypropyl methylcellulose, · 8% to 12% microcrystalline cellulose, · 25% to 35% magnesium carbonate, · 1% to 10% hydroxypropyl cellulose, and · 1% to 10% of at least one triglyceride and contains.

[0015] According to some embodiments, the hydrophobic composition · at least one N-acyl amino acid or a salt thereof whose acyl is a C12-C18 acyl group, · at least one silicone surfactant, or · a mixture thereof and contains.

[0016] In some embodiments, the hydrophobic coating composition preferably comprises at least one N-acyl amino acid or a salt thereof selected from stearoyl glutamine, palmitoyl glutamine, myristoyl glutamine, their sodium salts, their aluminum salts, or a mixture thereof.

[0017] Regarding the inorganic core coated with the above hydrophobic and hydrophilic coating compositions, it can be selected from the group consisting of titanium dioxide, red iron oxide, yellow iron oxide, black iron oxide, mica, nacre, chromium oxide, ultramarine blue, ferric blue, manganese violet, zinc oxide, aluminum oxide, zirconium oxide, boron nitride, barium sulfate, or a mixture thereof.

[0018] The present invention further relates to a cosmetic composition comprising the powder composition according to any one of the embodiments described above herein.

[0019] In some embodiments, the cosmetic composition according to the present invention can be selected from a sunscreen composition, a facial makeup composition, a cosmetic foundation composition, or a hair makeup composition.

[0020] Finally, the present invention a. supplying a hydrophobized inorganic powder composition comprising hydrophobized composite particles showing a coating of an inorganic core and a hydrophobic composition, and then b. contacting the hydrophobized inorganic powder composition of step a) with a hydrophilic composition, wherein the hydrophilic composition comprises microcrystalline cellulose and hydroxypropyl methylcellulose in an amount of 20% to 60% by weight based on the total weight of the hydrophilic composition, and then c. optionally, drying and / or pulverizing the composition obtained in step b), and d. recovering the powder composition according to the present invention relates to a process for preparing the powder composition of the present invention, comprising

[0021] In some embodiments, step a) a1. Supply an inorganic powder composition containing inorganic particles, and then a2. Treat the inorganic particles in step a1) with a hydrophobic composition, a3. Optionally, dry and / or grind the composition obtained in step a2), and a4. Recover a hydrophobized inorganic powder composition containing hydrophobized composite particles showing a coating of an inorganic core and a hydrophobic composition including this.

[0022] Definition In the present invention, the following terms have the following meanings.

[0023] "About" before a number means ±10% of the value of said number. According to one embodiment, the term "about" before a number means ±5% of the value of said number, preferably ±1% of the value of said number.

[0024] "Consisting essentially of" refers to a composition X containing a component Y in an amount of more than 95%, more than 96%, more than 97%, more than 98%, more than 99%, more than 99.5% by weight based on the total weight of the composition X. "Consisting essentially of" includes the term "consisting of" in which the composition X is composed of 100% of the component Y.

[0025] "Composite" refers to a material manufactured from at least two or more constituent materials. These constituent materials have significantly different chemical or physical properties and are combined to create a material having characteristics different from those of the individual elements. In the completed composite structure, the individual elements are separated and remain distinct, and the composite is distinguished from a mixture and a solid solution. In the context of the present invention, the composite particles refer to an inorganic core coated with a hydrophobic coating further coated with a hydroxypropyl methylcellulose-based composition.

[0026] "Hydrophilic" or "hydrophile" refers to a coating composition that is charge-polarized, typically mostly charge-polarized, capable of forming hydrogen bonds, and enabling it to exhibit an affinity for water rather than oil or other non-polar solvents. In the context of the present invention, the terms "hydrophilic" or "hydrophile" can be used interchangeably with the terms "lipophobic" or "lipophobe".

[0027] "Hydrophobic" or "hydrophobe" refers to a coating composition that is typically non-polarized, typically mostly non-polarized, enabling it to exhibit an affinity for oil, fats, and other non-polar solvents rather than water or other polar solvents. In the context of the present invention, the terms "hydrophobic" or "hydrophobe" can be used interchangeably with the terms "lipophilic" or "lipophile".

[0028] "Pigment" refers to white or colored solid particles that are usually insoluble in the hydrophilic and lipophilic phases of liquids used in cosmetics or are made insoluble by formulation in the form of a lacquer in some cases. Typically, the pigment refers to the inorganic particles or inorganic particle core of the composite particles according to the present invention.

Mode for Carrying Out the Invention

[0029] The present invention relates to a powder composition containing composite particles, wherein the composite particles exhibit an inorganic core, a hydrophobic coating composition, and a hydrophilic coating composition, the hydrophilic coating composition is hydroxypropyl methylcellulose (HPMC), HPMC is in an amount in the range of 20% to 60% by weight based on the total weight of the hydrophilic composition, and the hydrophilic coating composition typically further contains microcrystalline cellulose.

[0030] Inorganic Core The core of the particles of the present composition is inorganic and typically comprises, consists essentially of, or preferably consists of a metal, metal oxide, metal hydroxide, or ceramic material. In some embodiments, the inorganic core is a pigment according to any one of the inorganic pigments known in the art. Unless otherwise specified, the inorganic core is homogeneous, i.e., the composition of the inorganic core itself has a continuous diameter consistency. It is understood that inorganic particles, typically pigment particles, constitute the inorganic core of the composite particles according to the present invention when coated according to the present invention. In other words, unless otherwise specified, the inorganic core itself is not layered, and thus the subsequent hydrophobic coating and hydrophilic coating (layered) refer to the composite particles, not the inorganic core itself.

[0031] Typically, the inorganic particles exhibit an average diameter in the range of 5 nm to 20 μm prior to their coating according to the present invention. The average diameter can be determined by any means known in the art, such as sieving or laser diffraction scattering, preferably sieving.

[0032] In some embodiments, the inorganic core consists essentially of titanium dioxide (TiO2), iron(III) oxide (Fe2O3), iron(III) hydroxide (FeHO2), iron(II,III) oxide (Fe3O4), mica, nacre, chromium(III) oxide (Cr2O3), ultramarine blue (Na 8-10 Al6Si6O 24 S 2-4 Na 8-10 Al6Si6O 24 S 2-4 )), Prussian blue (Fe4[Fe(CN)6]3), manganese violet (H4MnNO7P2), zinc oxide (ZnO), aluminum oxide (Al2O3), zirconium oxide (ZrO2), boron nitride (BN), and barium sulfate (BaSO4), or a mixture thereof.

[0033] In some embodiments, the inorganic core consists essentially of, preferably, iron oxides and hydroxides such as titanium dioxide (TiO2), iron(III) oxide (Fe2O3), iron(III) hydroxide (FeHO2), iron(II,III) oxide (Fe3O4) or mixtures thereof, chromium(III) oxide (Cr2O3), ultramarine blue (Na 8-10 Al6Si6O 24 S 2-4 Na 8-10 Al6Si6O 24 S 2-4 ), Prussian blue (Fe4[Fe(CN)6]3), manganese violet (H4MnNO7P2), zinc oxide (ZnO), aluminum oxide (Al2O3), zirconium oxide (ZrO2), or a mixture of metal oxides or hydroxides selected therefrom.

[0034] Preferably, the inorganic core consists essentially of titanium dioxide (TiO2), iron oxides and hydroxides or mixtures thereof, typically the iron oxides and hydroxides are selected from iron(III) oxide (Fe2O3), iron(III) hydroxide (FeHO2), iron(II,III) oxide (Fe3O4) and mixtures thereof. In some embodiments, the inorganic core consists essentially of iron(III) oxide (Fe2O3). In some embodiments, the inorganic core consists essentially of iron(III) hydroxide (FeHO2). In some embodiments, the inorganic core consists essentially of iron(II,III) oxide (Fe3O4). In some embodiments, the inorganic core consists essentially of a mixture of iron oxides and / or hydroxides selected from iron(III) oxide (Fe2O3), iron(III) hydroxide (FeHO2), iron(II,III) oxide (Fe3O4). In some embodiments, the inorganic core of the particles consists essentially of iron oxides and hydroxides or mixtures thereof, and the particles exhibit an average diameter in the range of 5 μm to 20 μm, 8 μm to 15 μm or about 10 μm prior to their coating.

[0035] In some preferred embodiments, the inorganic core consists essentially of titanium dioxide (TiO2). In some embodiments, the inorganic core of the particles consists essentially of titanium dioxide (TiO2), and the particles exhibit an average diameter in the range of 100 nm to 1 μm, 200 nm to 600 nm or about 500 nm prior to their coating.

[0036] In some embodiments, the inorganic core consists essentially of mica, i.e., the formula X2Y 4-6 Z8O 20 (OH,F)4 (wherein X is K, Na, Ca, Ba, Rb or Cs, preferably K, Na or Ca, Y is Al, Mg, Fe, Mn, Cr, Ti or Li, preferably Al, Mg or Fe, and Z is Si, Al, Fe 3+ or Ti, preferably Z is Si or Al) of a phyllosilicate compound.

[0037] In some embodiments, the inorganic core consists essentially of nacre, a calcium carbonate-based, typically aragonite-based inorganic compound, further comprising an organic matrix of elastic biopolymers such as chitin, lustrin and silk-like proteins.

[0038] According to the present invention, the inorganic particles are coated with a hydrophobic coating composition and a hydrophilic coating composition containing 20% to 60% by weight of hydroxypropyl methylcellulose based on the weight of the hydrophilic composition.

[0039] According to a first variant, the hydrophilic coating composition coats the hydrophobic coating composition. According to such a variant, the hydrophobic coating composition coats the inorganic particle core, and the hydrophobic coating composition between the particle core and the hydrophilic coating composition contains 20% to 60% by weight of hydroxypropyl methylcellulose based on the total weight of the hydrophilic composition.

[0040] According to a second variant, the hydrophobic coating composition coats a hydrophilic coating composition containing 20% to 60% by weight of hydroxypropyl methylcellulose based on the total weight of the hydrophilic composition. According to such a variant, the hydrophilic coating composition coats the inorganic particle core, and the hydrophilic coating composition is between the particle core and the hydrophobic coating composition.

[0041] Preferably, the inorganic particle core is present in the powder composition in an amount in the range of 30% to 98% by weight, particularly 40% to 95% by weight, preferably 70% to 93% by weight, and more preferably 70% to 89% by weight based on the total weight of the powder composition.

[0042] Hydrophobic coating composition The surfaces of metal oxide pigments such as titanium oxide / iron oxide or iron hydroxide that can be used according to the present invention are hydrophilic. Therefore, they tend not to adhere well to the skin and tend to run off the skin when used as they are. According to some embodiments, any surface treatment composition known in the art for imparting a hydrophobic coating to the surface of the particles can be applied in the context of the present invention.

[0043] Advantageously, the hydrophobic coating composition comprises or consists essentially of at least one compound selected from silicone surfactants, N-acyl amino acids or their salts, fluorosurfactants, metal soaps, lecithin and its derivatives, isopropyltriisostearyl titanate, isostearyl sebacate, natural plant or animal waxes, polar synthetic waxes, fatty acid esters, phospholipids and mixtures thereof, preferably at least one compound selected from silicone surfactants, N-acyl amino acids or their salts and mixtures thereof, and more preferably the hydrophobic coating composition comprises or consists essentially of at least one compound selected from silicone surfactants, particularly at least one polydimethylsiloxane such as triethoxysilylethylpolydimethylsiloxydiethyl dimethicone, and N-acyl amino acids or their salts further selected from stearoylglutamine, palmitoylglutamine, their sodium salts, their aluminum salts and mixtures thereof.

[0044] In some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one compound selected from fluorosurfactants, metal soaps such as zinc laurate, magnesium stearate, magnesium myristate and zinc stearate and mixtures thereof, lecithin and its derivatives, isopropyltriisostearyl titanate, isostearyl sebacate, beeswax, lanolin wax, orange wax, lemon wax and Chinese insect wax, rice wax, carnauba wax, candelilla wax, ouricury wax, cork fiber wax, sugar cane wax, Japan wax, wood wax and montan wax, natural plant or animal waxes such as these, polar synthetic waxes, fatty acid esters such as jojoba ester, phospholipids, and mixtures thereof.

[0045] In some embodiments, the hydrophobic coating composition is present in an amount in the range of 0.5% to 15% by weight, based on the total weight of the powder composition. In some embodiments, the hydrophobic coating composition is present in an amount in the range of 0.5% to 5% by weight, based on the total weight of the powder composition. In some embodiments, the hydrophobic coating composition is present in an amount in the range of 1% to 12% by weight, based on the total weight of the powder composition. In some embodiments, the hydrophobic coating composition is present in an amount in the range of 1% to 5% by weight, such as, for example, about 3% by weight, based on the total weight of the powder composition.

[0046] Advantageously, the mass ratio of the amount of the first coating of the hydrophobic composition / the amount of the hydrophilic coating composition is equal to 1 or preferably less than 1, more preferably in the range of 0.1 to 1, even more preferably in the range of 0.3 to 0.8, such as, for example, about 0.4 to about 0.7.

[0047] According to one variation, the hydrophobic coating composition is covalently or non-covalently, more preferably non-covalently, bonded to the surface of the hydrophilic coating composition. According to a preferred variation, the hydrophobic coating composition is covalently or non-covalently, preferably covalently, bonded to the surface of the inorganic core of the particle.

[0048] Silicone surfactant In some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one silicone surfactant. The silicone surfactant may be selected from silane derivatives such as organopolysiloxanes, silicone-acrylate copolymers, silicone resins, and mixtures thereof.

[0049] In some embodiments, the hydrophobic coating composition · at least one organopolysiloxane such as at least one polydimethylsiloxane, at least one polymethylhydrogensiloxane, and / or at least one polyalkoxydimethylsiloxane, · at least one non-elastomeric organopolysiloxane selected from at least one polydimethylsiloxane such as triethoxysilylethylpolydimethylsiloxysilylethyl dimethicone, · at least one alkylsilane, · at least one alkoxysilane such as at least one alkyltriethoxysilane and / or at least one alkyltrimethoxysilane, · at least one silicone-acrylate polymer, · at least one silicone resin, · at least one fluorosilicone, or · mixtures thereof comprises or consists essentially of, Here, the alkyl group (R) represents a methyl, ethyl, propyl, butyl or octyl, 2-phenylethyl, 2-phenylpropyl or 3,3,3-trifluoropropyl radical, an aryl radical such as phenyl, tolyl or xylyl or a substituted aryl radical such as phenylethyl, and the alkoxy group (R-O) represents a methoxy, ethoxy, propoxy, butyloxy or octyloxy, 2-phenylethoxy, 2-phenylpropoxy or 3,3,3-trifluoropropoxy radical, an aryloxy radical such as phenoxy, tolyloxy or xylyloxy or a substituted aryloxy radical such as phenylethoxy.

[0050] Methods for surface-treating pigments with silicone-based compounds, especially silicone surfactants, are generally known in the art. For example, inorganic particles can be dispersed in an organic solvent in which a silicone-based compound is added. When this mixture is heated, a covalent bond is formed between the silicone compound and the surface of the pigment, thereby obtaining an inorganic composition in which the inorganic particles form a core coated with a coating of the silicone-based compound.

[0051] In some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one organopolysiloxane. The term "organopolysiloxane compound" means a compound having a structure containing silicon atoms and oxygen atoms alternately and containing organic radicals bonded to the silicon atoms.

[0052] In some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one organopolysiloxane selected from polydimethylsiloxane, polymethylhydrogensiloxane and polyalkoxydimethylsiloxane.

[0053] In some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one polyalkoxydimethylsiloxane, where the alkoxy group may be selected from methoxy, ethoxy, propoxy, butyloxy or octyloxy, 2-phenylethyloxy, 2-phenylpropyloxy or 3,3,3-trifluoropropyloxy radicals, aryloxy radicals such as phenoxy, tolyloxy or xylyloxy or substituted aryloxy radicals such as phenylethyloxy.

[0054] According to some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one non-elastomeric organopolysiloxane, particularly selected from polydimethylsiloxane. According to a specific embodiment, the hydrophobic coating composition comprises or consists essentially of triethoxysilylethylpolydimethylsiloxylethyldimethylcon.

[0055] According to some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one alkyltriethoxysilane or at least one alkyltrimethoxysilane.

[0056] According to some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one silicone-acrylate polymer.

[0057] In some embodiments, at least one silicone-acrylate polymer has the formula (I):

Chemical formula

[0058] wherein the radicals G1 may be the same or different and represent hydrogen or a C1-C 10 alkyl radical or alternatively a phenyl radical, and the radicals G2 may be the same or different and are C1-C 10represents an alkylene group, G3 represents a polymer residue obtained from the (homo)polymerization of at least one ethylenically unsaturated anionic monomer, G4 represents a polymer residue obtained from the (homo)polymerization of at least one ethylenically unsaturated hydrophobic monomer, with the condition that one of the parameters a and c is non-zero, m and n are equal to 0 or 1, a is an integer in the range of 0 to 50, b may be an integer in the range of 10 to 350, and c is an integer in the range of 0 to 50.

[0059] In some embodiments, · The radical G1 represents an alkyl radical, preferably a methyl radical, · n is non-zero, and the radical G2 represents a divalent C1-C3 radical, preferably a propylene radical, · G3 represents a polymer radical obtained from the (homo)polymerization of at least one monomer of the ethylenically unsaturated carboxylic acid type, preferably acrylic acid and / or methacrylic acid, · G4 preferably represents a polymer radical obtained from the (homo)polymerization of at least one monomer of the (C1-C 10 )alkyl(meth)acrylate type such as isobutyl (meth)acrylate or methyl (meth)acrylate.

[0060] In some embodiments, the silicone polymer corresponding to formula (I) is particularly polydimethylsiloxane (PDMS) in which poly(isobutyl (meth)acrylate) type polymer units are grafted thereto via a thiopropylene type linking chain unit.

[0061] Examples of the silicone polymer corresponding to formula (I) are particularly polydimethylsiloxane (PDMS) in which mixed polymer units of the (meth)acrylic acid type and poly(methyl (meth)acrylate) type or poly(isobutyl (meth)acrylate) type are grafted thereto via a thiopropylene type linking chain unit.

[0062] According to some embodiments, the hydrophobic coating composition according to the present invention comprises or consists essentially of at least one silicone resin.

[0063] The term "resin" means a three-dimensional structure. The silicone resin may be soluble or swellable in silicone oil. These resins are cross-linked polyorganosiloxane polymers.

[0064] The nomenclature of silicone resins is known by the name "MDTQ", and the resin is described as a function of the various siloxane monomer units it contains, and each of the letters "MDTQ" characterizes the type of unit.

[0065] The letter M represents a monofunctional unit of the formula (CH3)3SiO 1 / 2 and the silicon atom is bonded to only one oxygen atom in the polymer containing this unit. The letter D represents a difunctional unit (CH3)2SiO where the silicon atom is bonded to two oxygen atoms 2 / 2 The letter T represents a trifunctional unit of the formula (CH3)SiO 3 / 2 In the units M, D and T defined above, at least one of the methyl groups may be replaced by an R group other than a methyl group such as a hydrocarbon radical (especially an alkyl) containing 2 to 10 carbon atoms or a phenyl group or alternatively one hydroxy group. Finally, the letter Q means a tetrafunctional unit SiO where the silicon atom is bonded to four hydrogen atoms which are themselves bonded to the rest of the polymer 4 / 2

[0066] Various resins with different properties may be obtained from these different units, and the properties of these polymers vary as a function of the type of monomer (or unit), the type and number of substituted radicals, the length of the polymer chain, the degree of branching and the size of the side chains.

[0067] According to some embodiments, at least one silicone resin is · of the formula [(CH3)3XSiXO] x X(SiO4 / 2 ) y A trimethylsiloxysilicate (MQ unit) (wherein x and y are integers in the range of 50 to 80) may also be a siloxysilicate, · Formula (CH3SiO 3 / 2 ) x (T unit) polysilsesquioxane (wherein x is greater than 100 and at least one of its methyl radicals may be substituted with the R group defined above), · Polymethylsilsesquioxane which is a polysilsesquioxane in which none of the methyl radicals are substituted with another group selected from.

[0068] According to some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one fluorosilicone.

[0069] In some embodiments, at least one fluorosilicone compound may be selected from perfluoroalkyldimethicone, perfluoroalkylsilane and perfluoroalkyltrialkoxysilane.

[0070] In some embodiments, at least one fluorosilicone compound has the formula II:

Chemical formula

[0071] N-acyl amino acid or a salt thereof In some preferred embodiments, the hydrophobic coating composition comprises or consists essentially of at least one N-acyl amino acid or a salt thereof.

[0072] The N-acyl amino acids or salts thereof described herein may contain an acyl group having 8 to 22 carbon atoms, such as a 2-ethylhexanoyl, caproyl, lauroyl, myristoyl, palmitoyl, stearoyl or cocoil group, preferably the acyl group contains 12 to 22 carbon atoms. In some embodiments, the acyl group is selected from myristoyl, palmitoyl and stearoyl. In some embodiments, the acyl group is selected from myristoyl and palmitoyl. In some embodiments, the acyl group is myristoyl. In some embodiments, the acyl group is palmitoyl. In some embodiments, the acyl group is stearoyl.

[0073] In some embodiments, the amino acid is selected from lysine, glutamic acid or alanine. In some embodiments, the amino acid is glutamic acid.

[0074] In some embodiments, the salt of the N-acyl amino acid may be an aluminum, magnesium, calcium, zirconium, zinc, sodium or potassium salt. In some embodiments, the salt of the N-acyl amino acid may be an aluminum and / or sodium salt.

[0075] In some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one N-acyl amino acid or a salt thereof, preferably selected from stearoyl glutamine, palmitoyl glutamine, their sodium salts, their aluminum salts or mixtures thereof.

[0076] In some embodiments, the hydrophobic coating composition comprises or consists essentially of stearoyl glutamate, typically aluminum and / or sodium stearoyl glutamate.

[0077] In some embodiments, the hydrophobic coating composition comprises or consists essentially of myristoyl glutamate, typically aluminum myristoyl glutamate and / or sodium myristoyl glutamate. In some embodiments, the hydrophobic coating composition according to the present invention comprises or consists essentially of myristoyl glutamate, typically aluminum myristoyl glutamate and / or sodium myristoyl glutamate, which is a coating of the VAA®, VAI® or MiyoNAT VAA® product series commercialized by MIYOSHI.

[0078] In some embodiments, the hydrophobic coating composition comprises or consists essentially of palmitoyl glutamate, typically aluminum palmitoyl glutamate and / or sodium palmitoyl glutamate such as aluminum palmitoyl glutamate commercialized as the reference NAI® product series typically commercialized by MIYOSHI.

[0079] Fluorinated surfactant In some embodiments, the hydrophobic coating composition comprises or consists essentially of at least one fluorinated surfactant. The fluorinated surfactant may refer to a fluorinated organic compound.

[0080] The fluorinated surfactant may be selected from perfluoroalkyl phosphate, perfluoropolyether, polytetrafluoroethylene (PTFE), perfluoroalkane, perfluoroalkylsilazane, polyhexafluoropropylene oxide, and polyorganosiloxane containing a perfluoroalkyl perfluoropolyether group. The term "perfluoroalkyl radical" means an alkyl radical in which all hydrogen atoms are replaced by fluorine atoms.

[0081] Examples of straight-chain perfluoroalkanes include perfluorocycloalkanes, perfluoro(alkylcycloalkanes), perfluoropolycycloalkanes, aromatic perfluorohydrocarbons (perfluoroarenes), and hydrocarbon-based perfluoroorganic compounds containing at least one heteroatom.

[0082] Examples of perfluoroalkanes include straight-chain alkane series such as perfluorooctane, perfluorononane, or perfluorodecane.

[0083] Examples of perfluorocycloalkanes and perfluoro(alkylcycloalkanes) include perfluoro(C3 - C5 alkylcyclohexanes) such as perfluorodecalin, perfluoro(methyldecalin), and perfluoro(butylcyclohexane).

[0084] Examples of perfluoropolycycloalkanes include bicyclo[3.3.1]nonane derivatives such as perfluorotrimethylbicyclo[3.3.1]nonane, adamantane derivatives such as perfluorodimethyladamantane, and hydrogenated perfluorophenanthrene derivatives such as tetracosafluorotetradecahydrophenanthrene.

[0085] Examples of perfluoroarenes include perfluoronaphthalene derivatives, such as perfluoronaphthalene and perfluoromethyl - 1 - naphthalene.

[0086] Hydrophilic coating composition Inorganic particles that have only been surface - treated to show a hydrophobic coating surrounding an inorganic core tend to aggregate with each other, are not easily dispersed in an aqueous medium during the manufacture of cosmetic formulations, and may cause negative sensory perceptions such as a "heavy" feeling during their use. Furthermore, they are not compatible with aqueous cosmetic formulations such as aqueous dispersions.

[0087] Accordingly, the composite particles of the powder composition of the present invention exhibit the inorganic core and the hydrophobic coating composition described above, and they further include a hydrophilic coating composition containing 20% to 60% by weight of hydroxypropyl methylcellulose (HPMC) based on the total weight of the hydrophilic composition. In some embodiments, the hydrophilic coating composition contains 30% to 55% by weight of HPMC based on the total weight of the hydrophilic composition. In some embodiments, the hydrophilic coating composition contains 40% to 50% by weight of HPMC based on the total weight of the hydrophilic composition. In some embodiments, the hydrophilic coating composition contains about 45%, about 50% or about 55% by weight of HPMC, preferably about 50% by weight, based on the total weight of the hydrophilic composition.

[0088] In some embodiments, the hydrophilic coating composition is in an amount in the range of 0.5% to 10% by weight based on the total weight of the powder composition. In some embodiments, the hydrophilic coating composition is in an amount in the range of 3% to 8% by weight based on the total weight of the powder composition.

[0089] In some embodiments, the hydrophilic coating composition is in an amount in the range of 7% to 9% by weight, such as about 8% by weight, based on the total weight of the powder composition.

[0090] In some embodiments, the hydrophilic coating composition is in an amount in the range of 3% to 5% by weight, such as about 4% by weight, based on the total weight of the powder composition.

[0091] In some embodiments, the hydrophilic coating composition is in an amount in the range of 2% to 4% by weight, typically about 3% by weight, based on the total weight of the inorganic particles coated with the hydrophobic coating composition.

[0092] According to one variation, the hydrophilic coating composition is covalently or non-covalently, preferably non-covalently, bonded to the surface of the inorganic core of the particle. According to a preferred variation, the hydrophilic coating composition is covalently or non-covalently, more preferably non-covalently, bonded to the surface of the hydrophobic coating composition.

[0093] Hydroxypropylmethylcellulose Hydroxypropylmethylcellulose (HPMC), also known as hypromellose, is a non-ionic cellulose ether typically made from natural cotton fibers by a series of chemical treatments involving the etherification of the cellulose portion of the cellulose backbone structure and has a CAS number of 9004-65-3.

[0094] It is an odorless, tasteless and non-toxic white powder that can dissolve in cold water to form a clear, viscous solution with gelling and / or thickening properties. HPMC can typically exhibit methoxy substitution of the hydroxyl moieties of the cellulose backbone in an amount in the range of 15.0% to 30.0% by weight, typically 19.0% to 30.0% by weight, preferably 27.0% to 30.0% or 19.0% to 27.0% based on the total weight of the HPMC composition. In some embodiments, HPMC exhibits methoxy substitution in the range of 27.0% to 30.0% by weight based on the total weight of the HPMC composition.

[0095] HPMC can typically exhibit hydroxypropyl substitution of the hydroxyl moieties of the cellulose backbone in an amount in the range of 2.0% to 15.0% by weight, typically 4.0% to 12.0% by weight, preferably 4.0% to 7.5% or 7.0% to 12.0% based on the total weight of the HPMC composition. In some embodiments, HPMC exhibits hydroxypropyl substitution in the range of 7.0% to 12.0% by weight based on the total weight of HPMC compositions such as HPMC VIVAPHARM® HPMC E6 commercialized by JRS Pharma, for example.

[0096] Microcrystalline cellulose According to some embodiments, the hydrophilic composition may further comprise microcrystalline cellulose (MCC) in an amount in the range of preferably 5% to 25% by weight based on the hydrophilic composition. In some embodiments, the hydrophilic coating composition comprises microcrystalline cellulose in an amount of about 5%, about 10% or about 15% by weight, preferably about 10% based on the total weight of the hydrophilic composition.

[0097] Microcrystalline cellulose (MCC) consists of glucose units connected by 1-4 β-glycosidic bonds and is a naturally occurring polymer typically used in cosmetics as an abrasive, absorbent, anti-caking agent, aqueous thickener, binder, extender, emulsion stabilizer, slip modifier, and texturizer. Typically, the degree of polymerization is typically less than 400, and MCC particles having an average size smaller than 5 μm are less than 10% by weight relative to the total weight of the MCC composition when determined by a sieving method such as an air jet sieve.

[0098] According to some embodiments, MCC such as MCC commercialized by JRS Pharma as VIVAPUR® 105 exhibits particles with an average size exceeding 32 μm of up to 10%, preferably up to 8%, when determined by a sieving method such as an air jet sieve.

[0099] Inorganic filler According to some embodiments, the hydrophilic composition further comprises an inorganic filler in an amount preferably in the range of 25% to 35% by weight relative to the total weight of the hydrophilic composition. Typically, the inorganic filler functions as an extender for the hydrophilic coating composition.

[0100] In some embodiments, the inorganic filler is selected from the group consisting of magnesium carbonate, calcium carbonate, titanium dioxide, silica, silica beads, mica, talc, sericite, and mixtures thereof, and preferably the inorganic filler is magnesium carbonate.

[0101] Hydroxypropyl cellulose According to some embodiments, the hydrophilic composition preferably further comprises hydroxypropyl cellulose in an amount of 1% to 20%, 5% to 15%, 1% to 10%, preferably 5% to 10% by weight based on the total weight of the hydrophilic composition, typically about 5%. Hydroxypropyl cellulose (HPC) is a nonionic cellulose ether typically used as a binder in pharmaceutical compositions. Typically, the degree of molar substitution of glucose monomers by hydroxypropyl moieties ranges from 2 to 4.0. In some embodiments, the HPC exhibits a hydroxypropyl substitution in the range of more than 14%, more than 15% or more than 20% by weight based on the total weight of the HPC composition.

[0102] Triglyceride According to some embodiments, the hydrophilic composition may further comprise at least one triglyceride in an amount preferably in the range of 1% to 20%, 5% to 15%, 1% to 10%, preferably 5% to 10% by weight based on the total weight of the hydrophilic composition. A triglyceride is an ester derived from glycerol esterified with three fatty acids, typically C4 - C12 fatty acids. In some embodiments, the at least one triglyceride is at least one medium-chain triglyceride, where the fatty acids are C6 - C12 fatty acids. In some embodiments, the at least one triglyceride is a commercially available Miglyol® mixture of triglycerides. In some embodiments, the at least one triglyceride is at least one medium-chain triglyceride, where the fatty acids of the medium-chain triglyceride are selected from caprylic acid (C8), capric acid (C10), caproic acid (C6), lauric acid (C12), and mixtures thereof.

[0103] In some embodiments, at least one triglyceride is a mixture of medium-chain triglycerides containing or consisting essentially of capric acid (C8) in an amount in the range of 50% to 65%, capric acid (C10) in an amount in the range of 30% to 45%, caproic acid (C6) in an amount greater than 0% to 2%, and lauric acid (C12) in an amount greater than 0% to 3%, and their proportions are expressed by weight relative to the total weight of the medium-chain triglyceride mixture such as Miglyol 812® commercialized by Condea Chemie GmbH.

[0104] According to some embodiments, the hydrophilic coating composition is by weight relative to the total weight of the hydrophilic coating composition · 20% to 60%, 30% to 55%, preferably 45% to 55% hydroxypropyl methylcellulose (HPMC), · 5% to 25%, preferably 8% to 12% microcrystalline cellulose (MCC), and · 15% to 40%, preferably 25% to 35% inorganic filler composition, preferably magnesium carbonate and contains.

[0105] According to some embodiments, the hydrophilic coating composition is by weight relative to the total weight of the hydrophilic coating composition · 30% to 55%, preferably 45% to 55% hydroxypropyl methylcellulose (HPMC), preferably HPMC showing methoxy substitution in the range of 27.0% to 30.0% by weight relative to the HPMC composition and / or hydroxypropyl substitution in the range of 7.0% to 12.0% by weight relative to the HPMC composition, · 5% to 25%, preferably 8% to 12% microcrystalline cellulose, · 15% to 40%, preferably 25% to 35% inorganic filler composition, preferably magnesium carbonate, · 5% to 15%, 1% to 10%, preferably 5% to 10% hydroxypropyl cellulose (HPC), and · 1% to 20%, 1% to 10%, preferably 5% to 15%, more preferably 5% to 10% of at least one triglyceride, preferably at least one medium-chain triglyceride such as Miglyol 812 (registered trademark) is included.

[0106] According to some embodiments, the hydrophilic coating composition is by weight based on the total weight of the hydrophilic coating composition · 45% to 55% of hydroxypropyl methylcellulose, preferably HPMC showing methoxy substitution in the range of 27.0% to 30.0% by weight with respect to the HPMC composition and / or hydroxypropyl substitution in the range of 7.0% to 12.0% by weight with respect to the HPMC composition, · 8% to 12% of microcrystalline cellulose, · 25% to 35% of magnesium carbonate, · 1% to 10% of hydroxypropyl cellulose, and · 1% to 10% of at least one triglyceride, preferably at least one medium-chain triglyceride such as Miglyol 812 (registered trademark) is included.

[0107] According to some embodiments, the present powder composition is by weight based on the total weight of the composition on the condition that the sum of the amounts of a) to c) does not exceed 100% a) 30% to 98%, preferably 70% to 93% of the inorganic particle core described above, b) 0.5% to 15%, preferably 1% to 12%, 1% to 5% or 2% to 4% of the hydrophobic coating composition described above, and c) 0.5% to 10%, preferably 3% to 8% of the hydrophilic coating composition described above is included.

[0108] According to some embodiments, the present powder composition is by weight based on the total weight of the composition on the condition that the sum of the amounts of a) to c) does not exceed 100% a) 30% to 98%, preferably 70% to 93% of the inorganic particle core described above, b) At least one compound selected from 0.5% to 15%, preferably 1% to 12%, 1% to 5% or 2% to 4% of preferably a silicone surfactant, an N-acyl amino acid or a salt thereof and mixtures thereof, the hydrophobic coating composition described above, and c) 0.5% to 15%, preferably 3% to 8% of the hydrophilic coating composition described above including, preferably the hydrophilic composition containing the hydrophilic coating composition is by weight based on the total weight of the hydrophilic coating composition · 20% to 60%, 30% to 55%, preferably 45% to 55% of hydroxypropyl methylcellulose (HPMC), · 5% to 25%, preferably 8% to 12% of microcrystalline cellulose (MCC), and · 15% to 40%, preferably 25% to 35% of an inorganic filler composition, preferably magnesium carbonate is included.

[0109] According to some embodiments, the powder composition is by weight based on the total weight of the composition, provided that the sum of the amounts of a) to c) does not exceed 100% a) 30% to 98%, preferably 70% to 93% of the inorganic particle core described above, b) At least one compound selected from 0.5% to 15%, preferably 1% to 12%, 1% to 5% or 2% to 4% of preferably a silicone surfactant, especially at least one polydimethylsiloxane such as triethoxysilylethylpolydimethylsiloxydiethyl dimethicone, preferably at least one N-acyl amino acid further selected from stearoylglutamine, palmitoylglutamine, myristoylglutamine, their sodium salts, their aluminum salts and mixtures thereof (where acyl is a C12-C18 acyl group or a salt thereof), the hydrophobic coating composition described above, and c) 0.5% to 15%, preferably 3% to 8% of the hydrophilic coating composition described above A hydrophilic composition containing, preferably, a hydrophilic coating composition is, by weight based on the total weight of the hydrophilic coating composition · 20% to 60%, 30% to 55%, preferably 45% to 55% hydroxypropyl methylcellulose (HPMC), · 5% to 25%, preferably 8% to 12% microcrystalline cellulose (MCC), and · 15% to 40%, preferably 25% to 35% inorganic filler composition, preferably magnesium carbonate including.

[0110] According to some embodiments, the present powder composition is, by weight based on the total weight of the present composition, provided that the sum of the amounts of a) to c) does not exceed 100% a) 30% to 98%, preferably 70% to 93% of the inorganic particle core described above, b) 0.5% to 15%, preferably 1% to 12%, 1% to 5% or 2% to 4% of a hydrophobic coating composition consisting essentially of N-acyl amino acids or salts thereof and mixtures thereof, preferably selected from myristoyl glutamate, stearoyl glutamate, aluminum and / or sodium palmitoyl glutamate and mixtures thereof, c) 0.5% to 10%, preferably 3% to 8% of the hydrophilic coating composition described above including, preferably, the hydrophilic coating composition is, by weight based on the total weight of the hydrophilic coating composition · 20% to 60%, 30% to 55%, preferably 45% to 55% hydroxypropyl methylcellulose (HPMC), · 5% to 25%, preferably 8% to 12% microcrystalline cellulose (MCC), and · 15% to 40%, preferably 25% to 35% inorganic filler composition, preferably magnesium carbonate including.

[0111] According to some embodiments, the present powder composition is, by weight based on the total weight of the present composition, provided that the sum of the amounts of a) to c) does not exceed 100% a) 30% to 98%, preferably 70% to 93%, preferably · Inorganic particles consisting essentially of iron oxides and iron hydroxides selected from essentially red iron oxide (Fe2O3), yellow iron oxide (FeHO2), black iron oxide (Fe3O4) and mixtures thereof, and / or · Inorganic particles consisting essentially of titanium dioxide (TiO2) The inorganic particle core selected from the above, b) 0.5% to 15%, preferably 1% to 12%, 1% to 5% or 2% to 4% of a hydrophobic coating composition consisting essentially of at least one polydimethylsiloxane such as triethoxysilylethylpolydimethylsiloxylethyldimethylcon, c) 0.5% to 10%, preferably 3% to 8% of the hydrophilic coating composition described above and preferably the hydrophilic coating composition is by weight relative to the total weight of the hydrophilic coating composition · 30% to 55%, preferably 45% to 55% of hydroxypropylmethylcellulose (HPMC), preferably HPMC showing methoxy substitution in the range of 27.0% to 30.0% by weight relative to the HPMC composition and / or hydroxypropyl substitution in the range of 7.0% to 12.0% by weight relative to the HPMC composition, · 5% to 25%, preferably 8% to 12% of microcrystalline cellulose, · 15% to 40%, preferably 25% to 35% of an inorganic filler composition, preferably magnesium carbonate, · 5% to 15%, preferably 5% to 10% of hydroxypropylcellulose (HPC), and · 1% to 20%, 5% to 15%, preferably 5% to 10% of at least one triglyceride, preferably at least one medium-chain triglyceride such as Miglyol 812 (registered trademark) is included.

[0112] According to some embodiments, the powder composition is by weight relative to the total weight of the composition on the condition that the sum of the amounts of a) to c) does not exceed 100% a) 30% to 98%, preferably 70% to 93%, preferably · Inorganic particles consisting essentially of iron oxides and iron hydroxides selected from essentially red iron oxide (Fe2O3), yellow iron oxide (FeHO2), black iron oxide (Fe3O4) and mixtures thereof, and / or · Inorganic particles consisting essentially of titanium dioxide (TiO2) Selected from the inorganic particle cores described above, b) 0.5% to 15%, preferably 1% to 12%, 1% to 5% or 2% to 4%, preferably consisting essentially of stearoylglutamine, palmitoylglutamine, myristoylglutamine, their sodium salts, their aluminum salts or mixtures thereof, and even more preferably selected from aluminum and / or sodium myristoylglutamate. A hydrophobic coating composition consisting of N-acyl amino acids or their salts and mixtures thereof, c) 0.5% to 10%, preferably 3% to 8% of the hydrophilic coating composition described above Including, preferably the hydrophilic coating composition is by weight based on the total weight of the hydrophilic coating composition · 30% to 55%, preferably 45% to 55% hydroxypropylmethylcellulose (HPMC), preferably HPMC showing methoxy substitution in the range of 27.0% to 30.0% by weight with respect to the HPMC composition and / or hydroxypropyl substitution in the range of 7.0% to 12.0% by weight with respect to the HPMC composition, · 5% to 25%, preferably 8% to 12% microcrystalline cellulose, · 15% to 40%, preferably 25% to 35% inorganic filler composition, preferably magnesium carbonate, · 5% to 15%, preferably 5% to 10% hydroxypropylcellulose (HPC), and · 1% to 20%, 5% to 15%, preferably 5% to 10% of at least one triglyceride, preferably at least one medium-chain triglyceride such as Miglyol 812 (registered trademark) Containing.

[0113] The present invention further relates to a cosmetic composition comprising a powder composition according to any one of the embodiments described above in this specification.

[0114] In some embodiments, the cosmetic composition comprises, by weight, 1% to 99%, 5% to 85%, 10% to 75% or 20 to 60% of the powder composition according to the present invention, based on the total weight of the cosmetic composition. In some embodiments, the cosmetic composition consists essentially of the powder composition according to the present invention.

[0115] In some embodiments, the cosmetic composition comprises the powder composition according to the present invention in combination with at least one cosmetically acceptable ingredient. Cosmetically acceptable ingredients refer to excipients or cosmetically active compounds that are suitable for such use and do not induce any side effects such as toxicity, irritation, inflammation or allergic reactions. Such excipients may be selected from bulking agents, fillers, diluents that can promote the manufacture, application or absorption of the cosmetic composition, dyes, coating agents, dispersing agents, anti-adhesive agents, preservatives or perfumes. In the context of the present invention, cosmetically acceptable excipients also refer to ingredients acceptable for personal care products. The present powder composition may be particularly useful in formulations of cosmetically or pharmaceutically active compounds previously disclosed in the art. Pharmaceutically or therapeutically active compounds refer to active principles suitable for therapeutic use and related to health. Cosmetically active compounds refer to active principles that optionally result in a cosmetic composition in combination with a cosmetically acceptable solvent or excipient. The use of the cosmetic composition does not include therapeutic use and relates to well-being and beauty.

[0116] In some embodiments, the cosmetic composition according to the present invention can be selected from a sunscreen composition, a facial makeup composition, a cosmetic foundation composition or a hair makeup composition. According to some embodiments, the cosmetic composition is in the form of a dispersion of the powder of the present invention in a cosmetically acceptable aqueous medium such as water or water in combination with at least one water-soluble and cosmetically acceptable ingredient.

[0117] The present invention further relates to the use of the powder composition according to the present invention for the manufacture of a cosmetic composition. The present invention also relates to a process for manufacturing the cosmetic composition described above, the process comprising mixing a powder composition according to any one of the embodiments described above herein with at least one cosmetically acceptable ingredient.

[0118] According to a final aspect, the present invention relates to a process for preparing the powder composition according to the present invention. The process comprises a. supplying a hydrophobized inorganic powder composition comprising hydrophobized composite particles exhibiting a coating of an inorganic core and a hydrophobic composition, and then b. contacting the hydrophobized inorganic powder composition of step a) with a hydrophilic composition comprising 20% to 60% by weight of hydroxypropyl methylcellulose relative to the total weight of the hydrophilic composition described in any one of the above embodiments, and then c. optionally, drying and / or pulverizing the composition obtained in step b), and d. recovering the powder composition according to the present invention and includes.

[0119] According to some embodiments, the hydrophobized inorganic powder composition according to step a) is a commercially available product such as the hydrophobized inorganic powders VAA (registered trademark), NAI (registered trademark), VAI (registered trademark) or MiyoNAT VAA (registered trademark) product series commercialized by, for example, MIYOSHI.

[0120] According to some embodiments, the hydrophobized inorganic powder composition according to step a) a1. supplying an inorganic powder composition comprising the inorganic particles described above, and then a2. treating the inorganic particles of step a1) with the hydrophobic composition described above, a3. optionally, drying and / or pulverizing the composition obtained in step a2), and a4. recovering a hydrophobized inorganic powder composition comprising hydrophobized composite particles exhibiting a coating of an inorganic core and a hydrophobic composition It is prepared in situ by this method.

[0121] Subsequently, the hydrophobized inorganic powder obtained in step a4) can be supplied according to process step a) and subjected to steps b) to d) of the powder production process according to the present invention.

[0122] According to some embodiments, in step b), a weight increase in the range of 2% to 5%, typically about 3%, of the hydrophobized inorganic particles in step a) occurs.

[0123] According to some embodiments, step b) includes mixing a hydrophilic composition in water to obtain an aqueous preparation of a hydrophilic coating composition, then suspending the hydrophobized inorganic powder in the aqueous preparation, and stirring the resulting suspension. In some embodiments, the hydrophilic coating composition is present in an amount in the range of 15% to 30% by weight, for example about 20%, based on the total weight of the aqueous preparation of the hydrophilic coating composition.

[0124] The grinding according to steps a3) and c) can be carried out by any grinding means known in the art such as milling.

[0125] The drying according to steps a3) and c) can be carried out by any drying means known in the art such as air drying or freeze drying.

Examples

[0126] The present invention is further illustrated by the following examples.

[0127] Example 1: Preparation of hydrophilic coating composition The hydrophilic coating composition according to the present invention was prepared according to Table 1.

Table 1

[0128] Example 2: Coating with hydrophilic coating composition The hydrophilic composition of Example 1 was mixed with water while being continuously stirred to obtain a 20% aqueous preparation of the hydrophilic coating composition.

[0129] The dry inorganic powders of titanium dioxide (306W), red iron oxide (306R), yellow iron oxide (306Y), and black iron oxide (306B) were hydrophobized with 3% aluminum and / or sodium myristoyl glutamate.

[0130] Next, the hydrophobized composite particles of these inorganic powders were coated with the hydrophilic coating composition of Example 1 under the following conditions.

[0131] Each of the hydrophobized inorganic powders was suspended in an aqueous preparation and stirred. Then, the resulting suspension was dried in a dryer, then air-dried overnight, and then pulverized to obtain the following powder composition according to the present invention.

Table 2

[0132] On the premise that the inorganic cores of the iron oxide and iron hydroxide particles exhibit an average diameter in the range of 5 μm to 20 μm and the titanium dioxide (TiO2) particles exhibit an average diameter in the range of 100 nm to 1 μm, the amount of the hydrophilic coating composition was adjusted as shown in Table 2.

[0133] Example 3: Analysis of the obtained powder composition The powder composition according to Example 2 was subjected to a comparative sensory analysis, where three testers evaluated the sensory properties of the pigment composition before and after coating with the hydrophilic coating composition according to Example 1. The results are provided in Table 3.

Table 3

[0134] All testers reported a dry feeling on the skin with the powder composition according to the present invention and a decrease in the greasiness and roughness of the particles compared to the particles coated only with the hydrophobic coating composition.

[0135] Subsequent coating with the hydrophilic coating composition according to Example 1 did not significantly affect the color tone of the pigment composition. On the contrary, the white titanium dioxide pigment composition according to the present invention exhibited a brighter white color tone compared to the creamy titanium dioxide pigment composition coated only with the hydrophobic composition. Similarly, the black iron oxide pigment composition according to the present invention exhibited a darker black color tone compared to the black iron oxide pigment composition coated only with the hydrophobic composition.

[0136] Furthermore, the powder compositions 4% HPW-306W and 8% HPW-306Y according to Table 2 were subjected to a water affinity test.

[0137] The powder compositions 4% HPW-306W and 8% HPW-306Y were suspended in water, and then an equal volume of isononyl isononanoate was added, thereby forming a two-phase system.

[0138] After stirring to form a two-phase system, it was possible to observe that both powders were recovered in the lower aqueous phase. After one month, · For neither the 4% HPW-306W nor the 8% HPW-306Y powder was any significant migration to the oil phase observed, · Both the 4% HPW-306W and 8% HPW-306Y powders showed some sedimentation in the aqueous phase that was easily reconstituted by gentle stirring, and · No particle aggregates were observed.

[0139] From the above points, the powder composition according to the present invention not only enables the improvement of the sensory properties of a hydrophobic pigment composition compatible with the skin, but also opens up a way to handle hydrophobic pigment particles in an aqueous cosmetic composition without the need to generate an emulsion.

Claims

1. A powder composition comprising composite particles, wherein the composite particles represent an inorganic core, a hydrophobic coating composition, and a hydrophilic coating composition, and the hydrophilic composition comprises hydroxypropyl methylcellulose and microcrystalline cellulose in an amount ranging from 20% to 60% by weight relative to the total weight of the hydrophilic composition.

2. The powder composition according to claim 1, wherein the coating of the hydrophilic composition coats the coating of the hydrophobic coating composition.

3. By weight relative to the total weight of the aforementioned powder composition - 0.5% to 15%, preferably 1% to 12% of the hydrophobic coating composition, - 0.5% to 10%, preferably 3% to 8% of the hydrophilic coating composition The powder composition according to claim 1, comprising:

4. The powder composition according to claim 1, wherein the hydrophilic coating composition contains microcrystalline cellulose in an amount ranging from 5% to 25% by weight relative to the total weight of the hydrophilic composition.

5. The powder composition according to claim 1, wherein the hydrophilic coating composition further comprises 15% to 40% by weight of an inorganic filler selected from the group consisting of magnesium carbonate, calcium carbonate, titanium dioxide, silica, silica beads, mica, talc, sericite, and mixtures thereof, with the inorganic filler preferably being magnesium carbonate.

6. The hydrophilic composition is, by weight, relative to the total weight of the hydrophilic composition. 30% to 55%, preferably 45% to 55%, hydroxypropyl methylcellulose, 5% to 25%, preferably 8% to 12%, of microcrystalline cellulose, 15% to 40%, preferably 25% to 35%, of magnesium carbonate The powder composition according to claim 1, comprising:

7. The powder composition according to claim 1, further comprising at least one triglyceride, hydroxypropyl cellulose, or a mixture thereof.

8. The hydrophilic composition is, by weight, relative to the total weight of the hydrophilic composition. 45% to 55% hydroxypropyl methylcellulose, 8% to 12% microcrystalline cellulose, 25% to 35% magnesium carbonate, ・1% to 10% hydroxypropyl cellulose, and 1% to 10% of at least one type of triglyceride The powder composition according to claim 1, comprising:

9. The hydrophobic composition is - At least one N-acylaminoamino acid or a salt thereof, in which the acyl is a C12-C18 acyl group, - At least one type of silicone surface agent, • those mixtures The powder composition according to claim 1, comprising:

10. The powder composition according to claim 1, preferably comprising at least one N-acylaminoamino acid or a salt thereof selected from stearoyl glutamine, palmitoyl glutamine, myristoyl glutamine, their sodium salts, their aluminum salts, or mixtures thereof.

11. The powder composition according to claim 1, wherein the inorganic core is selected from the group consisting of titanium dioxide, red iron oxide, yellow iron oxide, black iron oxide, mica, pearlescent layer, chromium oxide, ultramarine blue, ferric blue, manganese violet, zinc oxide, aluminum oxide, zirconium oxide, boron nitride, barium sulfate, or mixtures thereof.

12. A cosmetic composition comprising the powder composition according to any one of claims 1 to 11.

13. The cosmetic composition according to claim 12, wherein the cosmetic composition is selected from a sunscreen composition, a facial makeup composition, a cosmetic foundation composition, or a hair makeup composition.

14. A process for preparing the powder composition according to any one of claims 1 to 11, wherein the process is: a. A step of supplying a hydrophobic inorganic powder composition containing hydrophobic composite particles exhibiting an inorganic core and a hydrophobic composition coating, and then b. The step of contacting the hydrophobic inorganic powder composition of step a) with a hydrophilic composition containing hydroxypropyl methylcellulose and microcrystalline cellulose in an amount of 20% to 60% by weight relative to the total weight of the hydrophilic composition, and then c. Optionally, a step of drying and / or grinding the composition obtained in step b), and d. A step of recovering the powder composition according to any one of claims 1 to 11. A process that includes this.

15. Step a) is, a1. Supply an inorganic powder composition containing inorganic particles, and then a2. Treat the inorganic particles from step a1) with a hydrophobic composition. a3. Optionally, dry and / or grind the composition obtained in step a2), and a4. Recover the hydrophobic inorganic powder composition containing hydrophobic composite particles exhibiting an inorganic core and a coating of the hydrophobic composition. The process according to claim 14, including the following:

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