Surface-treated pigment and cosmetic composition containing the surface-treated pigment

Abstract

The present invention relates to a surface-treated pigment obtained by coating the pigment surface with at least one dextrin fatty acid ester and at least one silicone acrylate copolymer, and a cosmetic composition containing the surface-treated pigment, which has improved stability properties in terms of color and brightness over time.

Description

[Technical field]

[0001] The present invention relates to a surface-treated pigment obtained by coating the pigment surface with at least one dextrin fatty acid ester and at least one silicone acrylate copolymer, and to a cosmetic composition containing the surface-treated pigment, which has improved stability properties in terms of color and brightness over time. [Background technology]

[0002] Make-up foundations are used in the cosmetic field to provide a uniform and stable skin tone, especially in terms of color and brightness, over a long period of time.

[0003] Most of these cosmetic formulations contain pigments to provide desired visual properties such as opacity and color and / or special effects such as pearlescence and iridescence.

[0004] However, makeup foundations, especially fluid foundations, often suffer from color changes over time, such as turning to a darker or reddish shade upon application and drying on the skin, mostly due to evaporation of the liquid phase (water and volatile oils). These color changes and makeup transfer are disappointing to consumers who want to obtain a uniform and stable shade on the skin over a long period of time.

[0005] It is therefore important that the color of the composition remain stable, i.e., do not fade, discolor, migrate or change, once applied to the skin.

[0006] One major cause of the evolution of color in a composition when applied to the skin is the color difference between the pigments when dispersed in a wet formulation compared to their dry form.

[0007] In the past, efforts to improve the color stability of pigments have included surface treatment of pigments and powders.Therefore, over the years, many compositions and methods for surface treatment of cosmetic powders, especially pigments, have been developed to overcome the stability problems.Previously, various hydrophobic pigment coatings have been developed with oil, such as OTS (octadecyltrichlorosilane) coating, NAI (disodium stearoyl glutamate) coating, ASI (combination of isopropyl titanium triisostearate (ITT) and sodium lauroyl aspartate) coating, ASL (sodium lauroyl glutamate ridine, magnesium chloride) coating, PF (perfluoroalkyl phosphate) coating, FHS (perfluorooctyltriethoxysilane) coating, to avoid higher dispersibility in oil phase and wetting of pigments.

[0008] More recently, surface treatments with dextrin fatty acid esters have been described to provide surface-treated pigments with good dispersibility and adhesion to the skin and with excellent makeup-lasting ability, such as in the document JP Patent No. 5695331. However, these surface-treated pigments did not provide sufficiently good results in terms of shade and color stability over time of the applied makeup. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent No. 5695331 [Patent Document 2] European Patent No. 2537865 [Patent Document 3] French Patent Application Publication No. 2679771 [Patent Document 4] European Patent No. 1184426 [Patent Document 5] International Publication No. 2009 / 010356 [Non-patent literature]

[0010] [Non-Patent Document 1] Definition from the Ullmann Encyclopedia chapter on inorganic pigments [Non-Patent Document 2] International Cosmetic Ingredient Dictionary and Handbook, published by the Personal Care Products Council, 16h edition, 2016 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made in consideration of the above problems, and the object of the present invention is to provide cosmetic pigments having improved stability properties in terms of color and brightness over time, processes for their preparation, and cosmetic compositions containing such surface-treated pigments, such that the compositions exhibit improved stability of their color and shade over time. [Means for solving the problem]

[0012] The present inventors have carried out thorough research to solve the above-mentioned problems. As a result, the present inventors have found that a solution allows the pigment to be reliably wetted with a specific oil through a first coating, and the wet pigment to be reliably captured through another specific second coating. Therefore, the present invention relates to a treated pigment obtained by surface-treating the pigment with a dextrin fatty acid ester and a silicone acrylate copolymer.

[0013] Without wishing to be bound by any theory, it is believed that the pigment according to the present invention is wetted by the dextrin fatty acid ester; therefore, the oil is adsorbed around the pigment. Since the surface of the pigment is also treated with a silicone acrylate copolymer, the silicone acrylate copolymer prevents the elution of the dextrin fatty acid ester. Thus, the oil is held around the pigment, keeping it wet for a long period of time.

[0014] Therefore, the present invention provides a surface-treated pigment having improved stability characteristics in terms of color and brightness over time, and a cosmetic composition containing the surface-treated pigment. The cosmetic composition according to the present invention maintains stability in terms of color and does not fade, discolor, migrate, or change.

[0015] Thus, in a first aspect, the present invention relates to a surface treated pigment, wherein the surface treatment comprises at least one dextrin fatty acid ester and at least one silicone acrylate copolymer.

[0016] In a second aspect, the present invention provides a method for providing a surface treated pigment according to the present invention, comprising the steps of: - dissolving a dextrin fatty acid ester and a silicone acrylate copolymer in a solvent to form a slurry; - adding and mixing the slurry to the pigment under agitation; - removing the solvent; - grinding and drying the pigment to obtain the surface-treated pigment; The present invention relates to a method comprising the steps of:

[0017] Advantageously, the surface-treated pigments have improved color and brightness properties, such that the surface-treated pigments, as well as cosmetic compositions containing them, remain color stable and do not fade, discolor, migrate or change.

[0018] Thus, in a third aspect, the present invention relates to a cosmetic composition comprising a surface treated pigment, characterized in that the surface treatment comprises at least one dextrin fatty acid ester and at least one silicone acrylate copolymer, and a cosmetically acceptable medium.

[0019] In a fourth aspect, the present invention relates to the use of a surface treated pigment according to the invention for improving the color and brightness stability of makeup. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Surface Treatment Pigments In a first aspect, the present invention relates to a surface treated pigment, characterized in that the surface treatment comprises at least one dextrin fatty acid ester and at least one silicone acrylate copolymer.

[0021] Dextrin fatty acid ester Dextrin fatty acid esters are described, for example, in EP 2537865. Dextrin fatty acid esters are prepared by esterification between dextrin and fatty acid. The degree of substitution of dextrin with fatty acid is 1.0-3.0, preferably 1.2-2.8 per glucose unit.

[0022] The dextrin used in the dextrin fatty acid ester is a dextrin having an average glucose polymerization degree of preferably 3 to 150, particularly preferably 10 to 100. The dextrin may have any of linear, branched, and cyclic sugar chains.

[0023] The fatty acid used in the dextrin fatty acid ester necessarily contains one or more saturated branched fatty acids having 4 to 26 carbon atoms, and may further contain one or more fatty acids selected from the group consisting of saturated straight-chain fatty acids having 2 to 22 carbon atoms, unsaturated straight-chain or branched fatty acids having 6 to 30 carbon atoms, and saturated or unsaturated cyclic fatty acids having 6 to 30 carbon atoms (hereinafter, these fatty acids other than the saturated branched fatty acids having 4 to 26 carbon atoms are collectively referred to as "other fatty acids").

[0024] The composition ratio of the fatty acids is more than 50 mol% and 100 mol% or less, preferably 55 mol% or more and 100 mol% or less, based on the total amount of fatty acids of one or more saturated branched fatty acids having 4 to 26 carbon atoms, and is 0 mol% or more and less than 50 mol%, preferably 0 mol% or more and 45 mol% or less, based on the total amount of fatty acids of other fatty acids.

[0025] Examples of saturated branched fatty acids having 4 to 26 carbon atoms for use include isobutyric acid, isovaleric acid, 2-ethylbutyric acid, ethylmethylacetic acid, isoheptanoic acid, 2-ethylhexanoic acid, isononanoic acid, isodecanoic acid, isotridecanoic acid, isomyristic acid, isopalmitic acid, isostearic acid, isoarachidic acid, and isohexacosanoic acid. One or more of these fatty acids may be appropriately selected or combined for use.

[0026] Preferably, the fatty acid is isostearic acid. As used herein, isostearic acid refers to one branched stearic acid or a mixture of two or more branched stearic acids.

[0027] Examples of saturated straight chain fatty acids having 2 to 22 carbon atoms for use in the present invention include acetic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, and behenic acid. One or more of these fatty acids may be appropriately selected or combined for use.

[0028] Examples of unsaturated linear or branched fatty acids having 6 to 30 carbon atoms that can be used in the present invention include cis-4-decenoic (obtusilic) acid, 9-decenoic (caproic) acid, cis-4-dodecenoic (lindelic) acid, cis-4-tetradecenoic (tsuzunic) acid, cis-5-tetradecenoic (physeteric) acid, cis-9-tetradecenoic (myristoleic) acid, cis-6-hexadecenoic acid, cis-9-hexadecenoic (palmitoleic) acid, cis-9-octadecenoic (oleic) acid, trans-9-octadecenoic (enoic) acid, and trans-9-octadecenoic (enoic) acid. unsaturated monoenoic fatty acids such as cis-11-octadecenoic (asclepic) acid, cis-11-eicosenoic (gondic) acid, cis-17-hexacosenoic (ximenic) acid, and cis-21-triaconthenoic (lumecic) acid; and unsaturated polyenoic fatty acids such as sorbic acid, linoleic acid, heliconic acid, punicic acid, linoleic acid, gamma-linolenic acid, moloctic acid, stearidonic acid, arachidonic acid, EPA, clupanodonic acid, DHA, nisinic acid, stearic acid, crepenoic acid, and ximenynic acid.

[0029] The saturated or unsaturated cyclic fatty acid having 6 to 30 carbon atoms used in the present invention means a saturated or unsaturated fatty acid having a cyclic structure in at least a part of the basic skeleton and having 6 to 30 carbon atoms. Examples of these include 9,10-methylene-9-octadecenoic acid, aleprilic acid, alepuric acid, golric acid, α-cyclopentyl acid, α-cyclohexyl acid, α-cyclopentylethyl acid, α-cyclohexylmethyl acid, ω-cyclohexyl acid, 5(6)-carboxy-4-hexyl-2-cyclohexene-1-octanoic acid, malvalic acid, sterculic acid, hydnocarpic acid, and kaurmugric acid.

[0030] In a preferred embodiment, the dextrin fatty acid ester is dextrin isostearate (eg, a product commercially available from Chiba Flour Milling Co., Ltd. under the trade name UNIFILMA HVY, etc.).

[0031] Silicone Acrylate Copolymer The silicone acrylate copolymer may be selected from among acrylates / polytrimethylsiloxymethacrylate copolymer, acrylates / ethylhexylacrylate / dimethicone methacrylate copolymer, styrene / acrylates / dimethicone acrylate crosspolymer and acrylates / dimethicone copolymer.

[0032] In a preferred embodiment, silicone acrylate is acrylate / dimethicone copolymer.For example, the acrylate / dimethicone copolymer used is manufactured by Daito Kasei Kogyo Co., Ltd. under the product name "ASC treatment" and the following trade designations: ASC-2 TiO2 CR-50; ASC-5 RED R-516L; ASC-7 YELLOW LL-100P; ASC-2 BLACK BL-100.

[0033] Surface Treatment Pigments As used herein, the term "pigment" refers to any pigment that can be used regardless of their morphology (spherical, rod-like, needle-like, plate-like, infinite, scale-like, spindle-like, etc.), particle size (haze particles, fine particles, as small as pigment class, etc.), or particle structure (porous, non-porous, etc.).

[0034] As used herein, the term "pigment" includes white or colored inorganic or organic particles, insoluble in aqueous media, intended to color and / or opacify the composition.

[0035] The pigment may be an organic pigment, which may in particular be chosen from the compounds nitroso, nitro, azo, xanthene, quinoline, anthraquinone, phthalocyanine, metal complex type, isoindolinone, isoindoline, quinacridone, perinone, perylene, diketopyrrolopyrrole, thioindigo, dioxazine, triphenylmethane, quinophthalone.

[0036] Organic pigments are described in French Patent Application FR 2 679 771, for example carmine, carbon black, aniline black, melanin, azo yellow, quinacridone, phthalocyanine blue, sorghum red, blue pigments coded in the Colour Index under the references C1 42090, 69800, 69825, 73000, 74100, 74160, yellow pigments coded in the Colour Index under the references Cl 11680, 11710, 15985, 19140, 20040, 21100, 21108, 47000, 47005, green pigments coded in the Colour Index under the references Cl 61565, 61570, 74260, In particular, the pigments may be selected from orange pigments coded in the Colour Index under the reference numbers CI 11725, 15510, 45370, 71105, red pigments coded in the Colour Index under the reference numbers CI 12085, 12120, 12370, 12420, 12490, 14700, 15525, 15580, 15620, 15630, 15800, 15850, 15865, 15880, 17200, 26100, 45380, 45410, 58000, 73360, 73915, 75470, or pigments obtained by oxidative polymerization of indole or phenol derivatives.

[0037] These pigments may also be in the form of composite pigments as described in EP 1 184 426. The composite pigments may be composed of particles comprising an inorganic core, at least partially coated with an organic pigment and at least one binder that secures the organic pigment to the core.

[0038] The pigment may also be a lacquer. Lacquer refers to an insolubilized dye adsorbed onto insoluble particles, so that the resulting whole remains insoluble during use. An example of a lacquer is the product known as D&C Red 7 (CI 15 850:1).

[0039] The pigment may be an inorganic pigment. An inorganic pigment is any pigment that meets the definition given in the chapter on inorganic pigments of the Ullmann Encyclopedia. The inorganic pigments are selected from among zirconium or cerium oxides, zinc oxide, iron oxides (black, yellow or red) or chromium oxides, manganese violet, ultramarine blue, chromium hydrate and ferric blue, titanium dioxide, metal powders such as aluminum powder and copper powder. The following inorganic pigments can also be used: Ti2O5, Ti3O5, Ti2O3, TiO, ZrO2 mixed with TiCO2, ZrO2, Nb2O5, CeO2, ZnS.

[0040] In a preferred embodiment, the pigment is an inorganic pigment.

[0041] In a further preferred embodiment, the inorganic pigment is iron oxide (black, yellow or red).

[0042] For example, the iron oxides used may be those manufactured by Sensient Technologies Corporation under the product names UNIPURE YELLOW LC 182 HLC QUAL. STERILE, UNIPURE RED LC 381 HLC QUALITE STERILE.

[0043] The size of the pigments useful in the context of the present invention is generally between 100 nm and 10 μm, preferably between 200 nm and 5 μm, more preferably between 300 nm and 1 μm.

[0044] According to one embodiment, the surface treatment comprises 1-15% by weight of a dextrin fatty acid ester relative to the total weight of the composition, and 1-15% by weight of a silicone acrylate copolymer relative to the total weight of the composition.

[0045] In one embodiment, the surface treatment comprises a dextrin fatty acid ester in an amount of 1 to 12% by weight relative to the total weight of the composition, preferably 2 to 10% by weight relative to the total weight of the composition, and a silicone acrylate copolymer in an amount of 1 to 10% by weight relative to the total weight of the composition, preferably 2 to 7% by weight relative to the total weight of the composition.

[0046] Wet condition One major cause of the color development of a composition when applied to the skin is the color difference between pigments when dispersed in a wet formulation compared to their dry form. According to the present invention, one solution is to ensure that the pigment is wetted with a specific oil through a first coating and that the wet pigment is captured through another specific second coating. Thus, the oil is held around the pigment, keeping it wet for a long period of time.

[0047] As used herein, "wet" means holding the oil around the pigment.

[0048] This particular coating can provide the surface treated pigment with improved stability properties in terms of color and brightness over time.

[0049] method In a second aspect, the present invention provides a method for preparing a surface treated pigment according to the present invention, comprising: - dissolving a dextrin fatty acid ester and a silicone acrylate copolymer in a solvent to form a slurry; - adding the slurry to the pigment under agitation; - removing the solvent; - grinding and heating the pigment to obtain the surface-treated pigment; The present invention also relates to a method, comprising:

[0050] Typically, the solvent used is selected from among acetone, isobutyl alcohol, isopropyl alcohol, isopentyl alcohol, methanol, ethanol and hexane. Preferably, the solvent is hexane.

[0051] Typically, 5 to 15 parts by mass, preferably 6 to 12 parts by mass, preferably 8 to 10 parts by mass of the dextrin fatty acid ester and 5 to 15 parts by mass, preferably 6 to 12 parts by mass, preferably 8 to 10 parts by mass of the silicone acrylate copolymer are dissolved in 10 to 20 parts by mass, preferably 12 to 18 parts by mass, preferably 14 to 16 parts by mass of a solvent, and then 80 to 95 parts by mass, preferably 82 to 90 parts by mass of a pigment is added.

[0052] After forming the coating layer with the dextrin fatty acid ester and the silicone acrylate copolymer, the solvent is removed and the pigment is ground and heated to obtain the surface treated pigment according to the present invention.

[0053] Cosmetic Composition In a third aspect, the present invention relates to a cosmetic composition comprising a surface treated pigment, characterized in that the surface treatment comprises at least one dextrin fatty acid ester and at least one silicone acrylate copolymer, and a cosmetically acceptable medium.

[0054] The surface treated pigment is a surface treated pigment as described above. All of the above embodiments are encompassed by this aspect.

[0055] As used herein, the term "cosmetically acceptable medium" refers to a medium that is suitable for use in contact with the skin without undue adverse side effects (toxicity, irritation, allergic response, etc.).

[0056] Cosmetic acceptable ingredients As long as the object and effect of the present invention are not impaired, the cosmetic composition of the present invention can further contain cosmetically acceptable ingredients in addition to the surface-treated pigment of the present invention.

[0057] Examples of cosmetically acceptable ingredients include powdered ingredients other than the surface-treated pigment of the present invention, liquid oils, solid fats, waxes, hydrocarbons, higher fatty acids, higher alcohols (preferably alcohols having 6 or more carbon atoms, more preferably alcohols having 10 or more carbon atoms), synthetic ester oils, silicone oils, surfactants, co-surfactants, humectants, film-forming agents, thickeners, gelling agents, sequestering agents, lower alcohols, polyhydric alcohols, monosaccharides, oligosaccharides, amino acids, plant extracts, organic amines, polymer emulsions, antioxidants, antioxidant co-agents, vitamins, antibacterial agents, anti-inflammatory agents, water-soluble polymers, whitening agents, ultraviolet light absorbers such as organic and / or inorganic sunscreens, preservatives, emollients, anti-aging agents, anti-staining agents, keratolytic agents, pH adjusters, buffer solutions, fragrances, and water.

[0058] Any of the above components may be suitably selected and mixed according to the desired formulation and product form. The mixing amount of the components is not particularly limited as long as it can be used without departing from the purpose of the present invention. The mixing amount is suitably selected according to the formulation, product form, etc.

[0059] Examples of powdered components include talc, kaolin, mica, sericite, white mica, gold mica, synthetic mica, red mica, black mica, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, metal tungstates, silica, zeolite, barium sulfate, magnesium sulfate, calcined calcium sulfate (calcined gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powders, metal soaps (e.g., zinc myristate, calcium palmitate, Examples of suitable pigments include inorganic powders such as sodium, aluminum stearate, magnesium stearate and boron nitride; organic powders such as polyamide resin powder (nylon powder), polyethylene powder, polymethylmethacrylate powder, polystyrene powder, styrene / acrylic acid copolymer resin powder, benzoguanamine resin powder, polytetrafluoroethylene powder and cellulose powder; metal powder pigments such as aluminum powder and copper powder; organic pigments such as zirconium lake, barium lake or aluminum lake; and natural pigments such as chlorophyll and beta-carotene. It should be noted that the powdered components may be hydrophobized.

[0060] Examples of liquid oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, apricot kernel oil, wheat germ oil, camellia kissi oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, Yucha oil, Torreya seed oil, rice bran oil, China tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0061] Examples of solid fats include cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, Japan wax kernel oil, hydrogenated oil, Japan wax, and hydrogenated castor oil.

[0062] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, white bayberry wax, China wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugar cane wax, lanolin fatty acid isopropyl esters, hexyl laurate, reduced lanolin, jojoba wax, hydrogenated lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0063] Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, and hydrogenated polydecene.

[0064] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall oil acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0065] Examples of higher alcohols include straight-chain alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, and cetostearyl alcohol; branched alcohols such as monostearyl glycerin ether (batyl alcohol), 2-decyltetradecanol, lanolin alcohol, cholesterol, plant sterols, hexyldodecanol, isostearyl alcohol, and octyldodecanol.

[0066] Examples of synthetic ester oils include tripropylene glycol dineopentanoate, isononyl isononanoate, isotridecyl isononanoate, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, 12-hydroxyethyl ether, ethylhexyl ... Cholesteryl stearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, glycerin tri-2-ethylhexanoate, trioctanoic acid Glycerin, glycerin triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, Ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate, bis-behenyl / isostearyl / phytosteryl dimer dilinoleyl dimer dilinoleate, phytosteryl / behenyl / octyldodecyl / isostearyl lauroyl glutamate, and caprylic / capric triglyceride.

[0067] Examples of silicone oils include linear polysiloxanes such as dimethicone, methyltrimethicone, methylphenylpolysiloxane, and diphenylpolysiloxane; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; silicone resins that form a three-dimensional network structure; silicone rubber; silicone elastomers; and various modified polysiloxanes such as amino-modified polysiloxanes, polyether-modified polysiloxanes, alkyl-modified polysiloxanes, and fluorine-modified polysiloxanes.

[0068] Examples of silicone resins include acrylates / polytrimethylsiloxymethacrylate copolymers, available from DOW CORNING Corporation under trade names such as DC FA 4001 and DC FA 4002. Other examples of silicone resins include trimethylsiloxysilicate / dimethiconol crosspolymers, available from DOW CORNING Corporation under trade names such as DC 7-4411.

[0069] Examples of silicone elastomers include non-emulsifying organopolysiloxane elastomers and emulsifying organopolysiloxane elastomers. Examples of non-emulsifying organopolysiloxane elastomers include dimethicone / vinyl dimethicone crosspolymer, lauryl dimethicone / vinyl dimethicone crosspolymer, etc.

[0070] Dimethicone / vinyl dimethicone crosspolymers include, for example, products available from DOW CORNING Corporation, Midland, Michigan under the tradenames DC 9040 and DC 9045; products available from MOMENTIVE Performance Materials Inc. under the tradenames SFE 839 and Velvasil series of products; products available from Shin-Etsu Chemical Co., Ltd. under the tradenames KSG-15, KSG-16, and KSG-18 ([dimethicone / phenylvinyl dimethicone crosspolymer]); and Gransil™ series products from GRANT INDUSTRIES, Inc.

[0071] Lauryl dimethicone / vinyl dimethicone crosspolymers include, for example, products commercially available from Shin-Etsu Chemical Co., Ltd. under the trade names KSG-31, KSG-32, KSG-41, KSG-42, KSG-43, and KSG-44.

[0072] Examples of emulsifying organosiloxane elastomers include polyalkoxylated silicone elastomers, polyglycerolated silicone elastomers, or the like.

[0073] Polyalkoxylated silicone elastomers include, for example, products commercially available from DOW CORNING Corporation under the trade names DC9010 and DC9011; products commercially available from Shin-Etsu Chemical Co., Ltd. under the trade names KSG-20, KSG-21, KSG-30, KSG-31, KSG-32, KSG-33, KSG-210, KSG-310, KSG-320, KSG-330, KSG-340, and X-226146.

[0074] Examples of polyglycerolized silicone elastomers include products available from Shin-Etsu Chemical Co., Ltd. under the trade names KSG-710, KSG-810, KSG-820, KSG-830, KSG-840, KSG-31, KSG-32, KSG-41, KSG-42, KSG-43, and KSG-44. Examples of silicone elastomers having two types of branches, i.e., silicone chains and alkyl chains, are available from Shin-Etsu Chemical Co., Ltd. under the trade names KSG-042Z, KSG-045Z, KSG-320Z, KSG-350Z, KSG-820Z, and KSG-850Z.

[0075] In addition, silicone elastomers containing pendant or crosslinked polyalkyl ether groups may also be included as components of the cosmetic composition of the present invention. Particularly suitable silicone elastomers containing polyalkyl ether groups include compounds having the International Nomenclature of Cosmetic Ingredients (INCI) names: bis-vinyl dimethicone / bis-isobutyl PPG-20 crosspolymer, bis-vinyl dimethicone / PPG-20 crosspolymer, dimethicone / bis-isobutyl PPG-20 crosspolymer, dimethicone / PPG-20 crosspolymer, and dimethicone / bis-sec-butyl PPG-20 crosspolymer. Such crosslinked elastomers are available from Dow Corning Corporation under experimental names such as SOEB-1, SOEB-2, SOEB-3 and SOEB-4, and under suggested trade names such as DC EL-8052 IH Si organic elastomer blend. The elastomeric particles are supplied pre-swollen in their respective solvents, isododecane (for SOEB-1 and SOEB-2), isohexadecane (for SOEB-3), and isodecyl neopentanoate (for SOEB-4).

[0076] Examples of surfactants include lipophilic non-ionic surfactants and hydrophilic non-ionic surfactants.

[0077] Examples of lipophilic nonionic surfactants include sorbitan fatty acid esters such as sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexyl, and diglycerol sorbitan tetra-2-ethylhexyl; glycerol polyglycerol fatty acids such as glycerol mono-cottonseed fatty acid, glycerol monoerucate, glycerol sesquioleate, glycerol monostearate, glycerol α,α'-oleate pyroglutamate, and glycerol monostearate maleate; propylene glycol fatty acid esters such as propylene glycol monostearate; hydrogenated castor oil derivatives; and glycerol alkyl ethers.

[0078] Examples of hydrophilic nonionic surfactants include POE-sorbitan fatty acid esters such as POE-sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, and POE-sorbitan tetraoleate; POE-sorbitol fatty acid esters such as POE-sorbitol monolaurate, POE-sorbitol monooleate, POE-sorbitol pentaoleate, and POE-sorbitol monostearate; POE-glycerin fatty acid esters such as POE-glycerin monostearate, POE-glycerin monoisostearate, and POE-glycerin triisostearate; POE-monooleate, POE- POE-fatty acid esters such as distearate, POE-monodioleate and ethylene glycol distearate; POE-alkyl ethers such as POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether and POE-cholestanol ether; Pluronic type surfactants (e.g., Pluronic); POE-POP-alkyl ethers such as POE-POP-cetyl ether, POE-POP-2-decyltetradecyl ether, POE-POP-monobutyl ether, POE-POP-hydrogenated lanolin and POE-POP-glycerin ether.

[0079] Examples of co-surfactants include higher alcohols. Among them, straight-chain alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc. are preferred. Cetyl alcohol is particularly preferred.

[0080] Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid; 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt; edetate disodium; edetate trisodium; edetate tetrasodium; sodium citrate; sodium polyphosphate; sodium metaphosphate; gluconic acid; phosphoric acid; citric acid; ascorbic acid; succinic acid; edetic acid; and ethylenediaminehydroxyethyltriacetate trisodium.

[0081] Examples of lower alcohols include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol.

[0082] Examples of polyhydric alcohols include dihydric alcohols such as ethylene glycol, propylene glycol, pentylene glycol, trimethylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, tetramethylene glycol, 2,3-butylene glycol, pentamethylene glycol, 2-butene-1,4-diol, hexylene glycol, and octylene glycol; trihydric alcohols such as glycerin and trimethylolpropane; tetrahydric alcohols such as pentaerythritol (e.g., 1,2,6-hexanetriol); pentahydric alcohols such as xylitol; hexahydric alcohols such as sorbitol and mannitol; and polyhydric alcohol polyols such as diethylene glycol, dipropylene glycol, triethylene glycol, polypropylene glycol, and tetraethylene glycol. dihydric alcohol alkyl ethers such as ethylene glycol monomethyl ether and ethylene glycol monoethyl ether; dihydric alcohol alkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether and diethylene glycol monobutyl ether; dihydric alcohol ether esters such as ethylene glycol monomethyl ether acetate and ethylene glycol monoethyl ether acetate; glycerin monoalkyl ethers such as chimyl alcohol, selachyl alcohol and batyl alcohol; and sugar alcohols such as sorbitol, maltitol, maltotriose, mannitol, sucrose, erythritol, glucose, fructose, starch sugar, maltose, xylitose and reduced alcohols of starch sugar.

[0083] Examples of monosaccharides include trioses such as D-glyceryl aldehyde and dihydroxyacetone; tetroses such as D-erythrose, D-erythrulose, D-threose and erythritol; pentoses such as L-arabinose, D-xylose, L-lyxose, D-arabinose, D-ribose, D-ribulose, D-xylulose and L-xylulose; D-glucose, D-talose, D-psicose, D-galactose, D-fructose, L-galactose, L-mannose and D- hexoses such as tagatose; heptoses such as aldoheptose and heprose; octose such as octurose; deoxy sugars such as 2-deoxy-D-ribose, 6-deoxy-L-galactose and 6-deoxy-L-mannose; amino sugars such as D-glucosamine, D-galactosamine, sialic acid, aminouronic acid and muramic acid; and uronic acids such as D-glucuronic acid, D-mannuronic acid, L-guluronic acid, D-galacturonic acid and L-iduronic acid.

[0084] Examples of oligosaccharides include sucrose, lactose, maltose, trehalose, cellobiose, gentiobiose, umbilicin, raffinose, gentianose, maltotriose, melezitose, planteose, umbelliferose, stachyose, and verbascose.

[0085] Examples of amino acids include neutral amino acids such as threonine and cysteine; and basic amino acids such as hydroxylysine. Further, examples of amino acid derivatives include sodium acyl sarcosinate (sodium lauroyl sarcosinate), acyl glutamate, sodium acyl β-alanine, glutathione, and pyrrolidone carboxylic acid.

[0086] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0087] Examples of polymer emulsions include acrylic resin emulsions, poly(ethyl acrylate) emulsions, acrylic resin solutions, poly(alkyl acrylate) emulsions, poly(vinyl acetate) resin emulsions, and natural rubber latex.

[0088] Examples of vitamins include vitamins A, B1, B2, B6, C and E and their derivatives, pantothenic acid and its derivatives, and biotin.

[0089] Examples of antioxidants include ascorbic acid and its derivatives, such as ascorbyl palmitate, ascorbyl tetraisopalmitate, ascorbyl glucoside, magnesium ascorbyl phosphate, sodium ascorbyl phosphate, and ascorbyl sorbate; tocopherol and its derivatives, such as tocopherol acetate, tocopherol sorbate, and other esters of tocopherol; dibutylhydroxytoluene (BHT) and butylhydroxyanisole (BHA); gallic acid esters; phosphoric acid; citric acid; maleic acid; malonic acid; succinic acid; fumaric acid; cephalin; hexametaphosphate; phytic acid; ethylenediaminetetraacetic acid; and plant extracts, for example from Chondrus crispus, Rhodiola, Thermus thermophilus, mate leaf, oak wood, kayu rapet bark, cherry leaf, and ylang ylang leaf.

[0090] Examples of moisturizing agents include polyethylene glycol, propylene glycol, dipropylene glycol, glycerin, 1,3-butylene glycol, xylitol, sorbitol, maltitol, mucopolysaccharides such as chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelo-collagen, cholesteryl-12-hydroxystearate, bile salts, main components of NMF (natural moisturizing factors) such as pyrrolidone carboxylate and lactate, amino acids such as urea, cysteine ​​and serine, short-chain soluble collagen, diglycerol (EO)PO adducts, homopolymers or copolymers of 2-methacryloyloxyethyl phosphorylcholine, for example those commercially available from NOF Corporation under the trade names Lipidure HM and Lipidure PBM, panthenol, allantoin, Wilbride S PEG / PPG / Polybutylene Glycol-8 / 5 / 3 Glycerin, available from NOF Corporation under the trade name 753; trimethylglycine, available from Asahi Kasei Chemicals Corporation under the trade name AMINOCOAT; and various plant extracts such as Castanea sativa extract, hydrolyzed hazelnut protein, Polianthes tuberosa polysaccharide, Argania spinosa kernel oil, and extract of pearl containing conchiolin, available from Maruzen Pharmaceutical Co., Ltd. under the trade name Pearl Extract®.

[0091] Examples of emollients include glyceryl polymethacrylate, methyl gluceth-20, and the like.

[0092] Examples of anti-aging agents include acylamino acids (especially the products sold by SEDERMA under the trade names Maxilip, Matrixyl 3000 or Biopeptide CL, or the products sold by SEPPIC under the trade name Sepilift); pea extracts; hydrolyzed soy protein; methylsilanol mannuronate; hydrolyzed cucurbita pepo seedcake; Scenedesmus extract; and the like.

[0093] Examples of stain inhibitors include Moringa pterygosperma seed extracts (especially those sold by LSN under the trade name Purisoft); shea butter extracts (especially those sold by SILAB under the trade name Detoxyl), a blend of ivy extracts, phytic acid and sunflower seed extracts (e.g. those sold by SEDERMA under the trade name OSMOPUR), etc.

[0094] Examples of keratolytic agents include α-hydroxy acids (particularly glycolic acid, lactic acid, citric acid, malic acid, mandelic acid or tartaric acid), β-hydroxy acids (particularly salicylic acid), esters thereof (particularly C12-13 alkyl lactate esters), and plant extracts containing these hydroxy acids (particularly roselle (Hibiscus sabdriffa) extracts).

[0095] Examples of water-soluble polymers include dextrin, methylcellulose, ethylcellulose, sodium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose stearoyl ester, PVA, PVM, PVP, locust bean gum, guar gum, tara gum, tamarind gum, glucomannan, xylan, mannan, and agar.

[0096] Examples of anti-inflammatory agents include bisabolol, allantoin, tranexamic acid, zinc oxide, sulfur oxide and its derivatives, chondroitin sulfate, and glycyrrhizic acid and its derivatives (eg, glycyrrhizinate).

[0097] The cosmetic composition of the invention may contain at least one whitening agent to block the synthesis of structural proteins, such as the melanocyte-specific protein Pmel17, involved in the mechanism of melanogenesis (stage I). An example of such a whitening agent may be the ferulic acid-containing Cytovector (water, glycol, lecithin, ferulic acid, hydroxyethylcellulose) available from BASF under the trade name Cytovector®.

[0098] Furthermore, if desired, the cosmetic composition of the present invention may contain at least one peptide as described in WO 2009 / 010356.

[0099] Furthermore, if necessary, the cosmetic composition of the present invention may contain a whitening agent having an inhibitory effect on melanin synthesis and / or an inhibitory effect on the expression of microphthalmia-associated transcription factor (MITF) and / or an anti-tyrosinase activity and / or an inhibitory effect on the synthesis of endothelin-1. An example of such a whitening agent is licorice (Glycyrrhiza glabra) extract, commercially available from Maruzen Pharmaceutical Co., Ltd. under the trade name Licorice Extract®.

[0100] Furthermore, if necessary, the cosmetic composition of the present invention may contain whitening agents that also have an antioxidant effect, such as vitamin C compounds, including ascorbyl salts, ascorbyl esters of fatty acids or sorbic acid, and other ascorbic acid derivatives. Specific examples include ascorbyl phosphates (such as magnesium ascorbyl phosphate, sodium ascorbyl phosphate, etc.) and sugar esters of ascorbic acid (ascorbyl-2-glucoside, 2-O-α-D-glucopyranosyl L-ascorbate, 6-O-β-D-galactopyranosyl L-ascorbate, etc.). Active agents of this type are commercially available from DKSH under the trade name Ascorbyl glucoside®.

[0101] Furthermore, if necessary, the cosmetic composition of the present invention may contain other whitening agents. Examples of other whitening agents include pigmentation inhibitors such as plant extracts (e.g., Narcissus tazetta extract), cetyl tranxamate (Nikko Chemicals Co., Ltd.; product name: NIKKOL TXC), arbutin, kojic acid, ellagic acid, cysteine, 4-thioresorcinol, resorcinol or rucinol or derivatives thereof, glycyrrhizic acid, hydroquinone-β-glucoside, etc.

[0102] Additionally, if desired, the cosmetic composition of the present invention may further comprise an organic and / or inorganic sunscreen.

[0103] Examples of organic sunscreens include dibenzoylmethane derivatives such as butyl methoxydibenzoylmethane (a product available from HOFFMANN LA ROCHE Ltd. under the trade name Parsol 1789); cinnamic acid derivatives such as octyl methoxycinnamate (a product available from HOFFMANN LA ROCHE Ltd. under the trade name Parsol MCX), salicylates, para-aminobenzoic acid; β,β'-diphenylacrylate derivatives; benzophenone derivatives; benzylidene camphor derivatives such as terephthalylidene dicamphor sulfonic acid; phenylbenzimidazole derivatives; triazine derivatives; phenylbenzotriazole derivatives; anthranilic acid derivatives, and the like, all of which may be coated or encapsulated.

[0104] Examples of inorganic sunscreens can include pigments or nanopigments formed from coated or uncoated metal oxides. Examples of nanopigments include titanium oxide, iron oxide, zinc oxide, zirconium oxide or cerium oxide, all of which are well known as UV photoprotectants.

[0105] Examples of preservatives include p-hydroxybenzoic acid esters (eg, methylparaben and propylparaben) and phenoxyethanol.

[0106] In addition, as additives used in the cosmetic composition of the present invention, those mentioned in the International Cosmetic Ingredient Dictionary and Handbook, 16h Edition, 2016, published by the Personal Care Products Council, can be used.

[0107] The formulation of the cosmetic composition of the present invention can be selected arbitrarily, and a preferred formulation may be adopted depending on the product form. For example, solution type, emulsion type, powder dispersion type, water-oil two-layer type, water-oil-powder three-layer type, gel type, oil type, and the like can be adopted.

[0108] The cosmetic composition of the present invention is used, for example, in the form of makeup cosmetics (such as foundations, eye makeup such as eye shadow, eye shadow bases, blush, mascara, lip makeup products, body makeup products, and nail products) and skin care cosmetics (such as emulsions, creams, and sunscreens).

[0109] In particular, the cosmetic composition of the present invention is preferably used as a skin make-up cosmetic composition, in particular a foundation (such as a liquid foundation, cream foundation, solid foundation, makeup base, powder foundation, etc.), eye shadow, blusher, loose powder, concealer, etc.

[0110] In further preferred embodiments, the present invention is preferably a liquid foundation, a cream foundation, a solid foundation, lip make-up, a concealer, or an eye make-up.

[0111] In preparing these cosmetic compositions, the surface-treated pigment of the present invention may be further mixed into conventional formulations. Those skilled in the art know how to prepare these cosmetic compositions.

[0112] The content of the surface-treated pigment varies depending on the purpose and the method of use, but is usually preferably 0.1% by mass or more, more preferably 0.5% by mass or more, more preferably 2% by mass or more, based on the total mass of the cosmetic composition. Furthermore, the content of the surface-treated pigment is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less, based on the total mass of the cosmetic composition.

[0113] When the surface-treated pigment is used in a cosmetic composition, it is prepared by conventional methods using other ingredients, and can be implemented in various forms, for example, liquids, emulsions, creams, solids, gels, pastes.

[0114] For example, when the cosmetic composition of the present invention is used as a liquid foundation (O / W type, etc.), the content of the surface-treated pigment is preferably 0.5% by mass or more, more preferably 1% by mass or more, and even more preferably 2% by mass or more, based on the total mass of the cosmetic composition. Furthermore, the content of the surface-treated pigment is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less.

[0115] Furthermore, for example, when the cosmetic composition of the present invention is used as a lip makeup product, the content of the surface-treated pigment is preferably 0.5% by mass or more, more preferably 1% by mass or more, and even more preferably 2% by mass or more, based on the total mass of the cosmetic composition. Furthermore, the content of the surface-treated pigment is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less.

[0116] Furthermore, for example, when the cosmetic composition of the present invention is used as a concealer, the content of the surface-treated pigment is preferably 1% by mass or more, more preferably 3% by mass or more, and even more preferably 5% by mass or more, based on the total mass of the cosmetic composition. Furthermore, the content of the surface-treated pigment is preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less.

[0117] use Advantageously, the surface-treated pigments have improved stability of their color and shade over time, such that cosmetic compositions containing them remain color stable and do not fade, discolor, migrate or change.

[0118] The present invention therefore also relates in a fourth aspect to the use of a surface treated pigment according to the invention for improving the colour and brightness stability of make-up.

[0119] The surface treated pigment is a surface treated pigment as described above. All of the above embodiments are encompassed by this aspect.

[0120] Colorimetric measurement (L*a*b system) Color and brightness properties were evaluated using colorimetry (L*a*b* system).

[0121] The color difference between the dry and wet states was evaluated. The total color change (ΔE) was obtained by this formula:

[0122]

number

[0123] The higher the ΔE value, the greater the color change.

[0124] The ΔE values ​​obtained with the surface-treated pigments according to the invention are lower than those obtained with surface treatments according to the state of the art.

[0125] Advantageously, the treatment according to the invention allows for the production of surface-treated pigments with improved stability properties in terms of color and brightness over time, and thus the cosmetic composition according to the invention remains stable in terms of color and does not fade, discolor, migrate or change.

[0126] Thus, the surface-treated pigments improve the color and brightness stability of the makeup.

[0127] As used herein, makeup with improved color stability and brightness properties refers to makeup with a smaller ΔE; it is understood that the range of ΔE depends on the color of the pigment itself.

[0128] The present invention is further illustrated by the following examples, which should not be construed in any way as limiting the scope of the invention. EXAMPLES

[0129] Materials and Methods Dextrin Isostearate The dextrin isostearate used is manufactured by Chiba Flour Milling Co., Ltd. under the trade name UNIFILMA HVY.

[0130] Pigments The iron oxide used is manufactured by TITANIUM INDUSTRY CO., LTD, such as TAROXR-516HP or TAROXL-100HP.

[0131] Colorimetric measurement (L*a*b* system) Colorimetric measurements were performed using a spectrophotometer (CM-2600d manufactured by Konica Minolta, Inc.).

[0132] The color change (ΔE) was given by the following formula:

[0133]

number

[0134] L* indicates lightness, a* is the red / green coordinate, and b* is the yellow / blue coordinate.

[0135] The deltas of L* (ΔL*), a* (Δa*), and b* (Δb*) may be positive (+) or negative (-), but the overall difference, delta E (ΔE*), is always positive.

[0136] ΔL*(L2*sample minus L1*standard) = difference between lightness and darkness (+=lighter, -=darker)

[0137] Δa*(a2*sample minus a1*standard) = difference between red and green (+=more red, -=more green)

[0138] Δb*(b2*sample minus b1*standard) = difference between yellow and blue (+=more yellow, -=more blue)

[0139] Example 1 Preparation of surface-treated pigments according to the present invention In this example, the pigment was treated with acrylates / dimethicone copolymer and dextrin isostearate.

[0140] A. Treatment of Red Iron Oxide with Acrylates / Dimethicone Copolymer and Dextrin Isostearate Red iron oxide (TAROXR-516HP: manufactured by Titanium Industry Co., Ltd.) was treated with 5% acrylates / dimethicone copolymer and 10% dextrin isostearate.

[0141] The treatment method was as follows:

[0142] 8.3 pts.wt. (parts by weight) of acrylates / dimethicone copolymer (product with 60% active ingredient) and 10 pts.wt. of dextrin isostearate were dissolved in 16.5 pts.wt. of hexane (solvent), and added to 85 pts.wt. of pigment while stirring and mixing in a Henschel mixer. After stirring and mixing, the hexane was removed and dried, the pigment was crushed in a grinder, and then finally, they were heat-treated to obtain the surface-treated pigment.

[0143] B. Treatment of Yellow Iron Oxide with Acrylates / Dimethicone Copolymer and Dextrin Isostearate Yellow iron oxide (TAROXLL-100HP: manufactured by Titanium Industry Co., Ltd.) was treated with 7% acrylates / dimethicone copolymer and 10% dextrin isostearate.

[0144] The treatment method was the same as Example 1.A above, except for 7% acrylates / dimethicone copolymer and 10% dextrin isostearate.

[0145] C. Treatment of the White Pigment, Titanium Dioxide, with Acrylates / Dimethicone Copolymer and Dextrin Isostearate A white pigment, titanium dioxide (CR-50: manufactured by Ishihara Sangyo Kaisha Ltd.), was treated with 2% acrylates / dimethicone copolymer and 2% dextrin isostearate.

[0146] The treatment method was the same as Example 1.A above, except for 2% acrylates / dimethicone copolymer and 2% dextrin isostearate.

[0147] Example 2 Manufacturing of isostearate dextrin surface-treated pigments using cutting-edge technology According to one of the state of the art methods, the pigments were treated with dextrin isostearate.

[0148] A. Coating of red iron oxide with dextrin isostearate Red iron oxide (TAROXR-516HP: manufactured by Titanium Industry Co., Ltd.) was treated with 10% dextrin isostearate.

[0149] The treatment method was the same as in Example 1.A above, except with only 10% dextrin isostearate.

[0150] B. Coating of yellow iron oxide with dextrin isostearate Yellow iron oxide (TAROXLL-100HP: manufactured by Titanium Industry Co., Ltd.) was treated with 10% dextrin isostearate.

[0151] The treatment method was the same as in Example 1.A above, except with only 10% dextrin isostearate.

[0152] C. Coating of white pigment, titanium dioxide, with dextrin isostearate A white pigment, titanium dioxide (CR-50: manufactured by Ishihara Sangyo Kaisha, Ltd.), was treated with 2% dextrin isostearate.

[0153] The treatment method was the same as above for ASC-5 HVY-10 RED R-516P, except with 2% dextrin isostearate.

[0154] Example 3 Surface-treated pigments using cutting-edge technology In the following examples, the acrylates / dimethicone copolymer used is manufactured by Daito Kasei Kogyo Co., Ltd. under the product name "ASC Treatment" and the following product codes:

[0155] A. Red pigment iron oxide coated with acrylate / dimethicone copolymer The red pigment, iron oxide, treated with acrylates / dimethicone copolymer has the trade designation ASC-7 YELLOW LL-100P.

[0156] B. Yellow iron oxide coated with acrylate / dimethicone copolymer The yellow pigment, iron oxide, treated with acrylates / dimethicone copolymer has the trade designation ASC-5 RED R-516L.

[0157] C. A coating of white pigment titanium dioxide coated with acrylate / dimethicone copolymer The white pigment, titanium, treated with acrylate / dimethicone copolymer has the trade designation ASC-2 TiO2 CR-50.

[0158] Example 4 The color difference between the dry and wet states of the treated pigment One major cause of color development in a composition is the color difference between the pigments when they are dispersed in a wet formulation compared to their dry form.

[0159] Therefore, measurements were taken to assess the color difference between the dry and wet states of the treated pigments.

[0160] The test method for measuring color difference using the L*a*b* system was as follows.

[0161] a. Dryness measurement: 2 g of each pigment listed in the table below was placed on a filter paper (No. 5C, 150 mm diameter) and the filter paper was folded in half.

[0162] The pigment sandwiched between filter papers was then compressed.

[0163] The color of the compressed pigment was then measured by a spectrophotometer (CM-2600d, manufactured by Konica Minolta, Inc.).

[0164] b. Wetting Measurement: 2 g of each of the pigments listed in the table below was placed on a filter paper (No. 5C, 150 mm diameter) and the pigment was wetted with squalane.

[0165] The surface of the wet pigment was smoothed with a spatula.

[0166] The color of the wetted pigment was then measured by a spectrophotometer (CM-2600d, manufactured by Konica Minolta, Inc.).

[0167] c. The difference in color between dry and wet states The color difference between the wet and dry states of each pigment is compared in Table 1.

[0168] [Table 1]

[0169] The treated red pigment according to the invention (Example 1.A) has a lower value of ΔE compared to surface treated pigments according to the state of the art, i.e. a red pigment coated with dextrin isostearate (Example 2A) and a red pigment coated with acrylate / dimethicone copolymer (Example 3A).

[0170] [Table 2]

[0171] The treated yellow pigment according to the invention (Example 1.B) has a lower value of ΔE compared to surface-treated pigments according to the state of the art, i.e. a yellow pigment coated with dextrin isostearate (Example 2B) and a yellow pigment coated with acrylate / dimethicone copolymer (Example 3B).

[0172] For red and yellow pigments, the ASC HVY treated pigments according to the present invention (Examples 1.A and 1.B) have lower ΔE values ​​than other pigments, which indicates that the pigments are already wetted by dextrin isostearate before adding oil (squalane). Therefore, they have improved color stability and brightness properties.

[0173] Example 5 Difference in color change in emulsion blends The test method for measuring color difference using the L*a*b system was as follows.

[0174] a. Water-in-oil emulsion formulations: A water-in-oil emulsion of this invention was prepared according to the formulation shown in Table 2 below.

[0175] Components 1 to 4 were stirred until homogenous to obtain an oil phase mixture.

[0176] Separately, ingredients 5 to 8 were stirred until homogenous to obtain an aqueous phase mixture.

[0177] The aqueous phase mixture was then added to the oil phase mixture with stirring to obtain a water-in-oil emulsion.

[0178] Finally, each pigment was added to the water-in-oil emulsion and mixed thoroughly.

[0179] [Table 3]

[0180] b. Wetness measurement: The tested emulsion was spread on paper (Bycochart, uncoated chart #2831) using a 200 μm thick coater. The chart has white and black areas, and the color was measured on the black area by a spectrophotometer (CM-2600d, manufactured by Konica Minolta, Inc.).

[0181] c. Dryness measurement: ΔE was measured by spectrophotometer after complete drying.

[0182] d.Color difference between dry and wet state: The color difference between the wet and dry states of each pigment is compared in Table 3.

[0183] [Table 4]

[0184] The ASC HVY treated pigments of red iron oxide, yellow pigment and white pigment (Examples 1.A; 1.B; 1.C) had lower values ​​of ΔE compared to the surface treated pigments according to the state of the art, i.e. pigments coated with dextrin isostearate (Examples 2A, 2B and 2C) and pigments coated with acrylate / dimethicone copolymer (Examples 3A, 3B and 3C).

[0185] Therefore, according to the present invention, the treated pigment has improved stability properties in terms of color and brightness over time.In fact, the pigment is wetted by dextrin isostearate, so oil is adsorbed around the pigment.Since the surface of the pigment is also treated with acrylate / dimethicone copolymer, said acrylate / dimethicone copolymer prevents the elution of dextrin isostearate.The oil is therefore held around the pigment, keeping it wet for a long time.

[0186] Advantageously, therefore, cosmetic compositions containing such pigments remain color stable and do not fade, discolor, migrate or change.

[0187] Thus, wetting of the pigment with a specific oil through a first coat and trapping of said wetted pigment through another specific second coat improved the color stability and brightness of the makeup.

Claims

1. A surface-treated pigment, characterized in that the surface treatment comprises at least one dextrin fatty acid ester and at least one silicone acrylate copolymer; The pigment is an inorganic pigment, the silicone acrylate copolymer is an acrylate / dimethicone copolymer; A surface treated pigment, wherein the surface treatment comprises 1 to 15% by weight of a dextrin fatty acid ester, based on the total weight of the surface treated pigment, and 1 to 15% by weight of an acrylate / dimethicone copolymer, based on the total weight of the surface treated pigment.

2. 2. The surface-treated pigment according to claim 1, wherein the dextrin fatty acid ester is dextrin isostearate.

3. The surface-treated pigment according to claim 1, wherein the inorganic pigment is selected from the group consisting of zirconium oxide, cerium oxide, zinc oxide, iron oxide, chromium oxide, manganese violet, ultramarine blue, chromium hydrate, ferric blue, titanium dioxide and metal powders.

4. The surface treated pigment of claim 3, wherein the inorganic pigment is iron oxide.

5. 5. The surface treated pigment according to claim 1, wherein the surface treatment comprises 2 to 10% by weight of a dextrin fatty acid ester, based on the total weight of the surface treated pigment, and 2 to 7% by weight of a silicone acrylate copolymer, based on the total weight of the surface treated pigment.

6. A method for preparing the surface treated pigment according to any one of claims 1 to 5, comprising the steps of: - dissolving a dextrin fatty acid ester and a silicone acrylate copolymer in a solvent to form a slurry; - adding the slurry to the pigment under agitation; - removing the solvent; - grinding and heating the pigment to obtain the surface-treated pigment; A method comprising:

7. A cosmetic composition comprising the surface treated pigment according to any one of claims 1 to 5 and a cosmetically acceptable medium.

8. 8. The cosmetic composition according to claim 7, which is selected from a liquid foundation, a cream foundation, a solid foundation, lip makeup, eye makeup and a concealer.

9. 6. Use of the surface-treated pigment according to any one of claims 1 to 5 for improving the colour and brightness stability of make-up.

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