Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0001—Post-treatment of organic pigments or dyes
  • C09B67/0004—Coated particulate pigments or dyes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
  • A61K8/0241—Containing particulates characterized by their shape and/or structure
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/58—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing atoms other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur or phosphorus
  • A61K8/585—Organosilicon compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q1/00—Make-up preparations; Body powders; Preparations for removing make-up
  • A61Q1/02—Preparations containing skin colorants, e.g. pigments
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q19/00—Preparations for care of the skin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q3/00—Manicure or pedicure preparations
  • A61Q3/02—Nail coatings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/10—General cosmetic use
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/42—Colour properties
  • A61K2800/43—Pigments; Dyes
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/42—Colour properties
  • A61K2800/43—Pigments; Dyes
  • A61K2800/434—Luminescent, Fluorescent; Optical brighteners; Photosensitizers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
  • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
  • A61K2800/60—Particulates further characterized by their structure or composition
  • A61K2800/61—Surface treated
  • A61K2800/62—Coated
  • A61K2800/622—Coated by organic compounds

Definitions

• the present invention relates to a process for preparing a coated organic pigment, a coated organic pigment obtained according to this process and a cosmetic composition comprising such a coated organic pigment.
• the subject of the invention is also a process for making up keratin materials using said composition.
• the makeup composition and method are suitable for keratin materials such as skin, lips, hair, eyelashes, eyebrows and human nails.
• the composition is especially in the form of a make-up product, in particular nail polish, lip product, body make-up product, foundation, eyeshadow or cheeks, eyeliner , anti-dark circles product, mascara.
• Makeup compositions generally contain dyestuffs to impart the desired color to the composition.
• the dyestuffs may be inorganic or organic pigments. It is known that fluorescent dyes make it possible to obtain bright and very luminous colors that are visible, in particular under ultraviolet light.
• a fluorescent compound is a compound capable of absorbing in the UV or visible radiation at a wavelength ⁇ a b s between 250 and 800 nm and capable of re-emitting in the visible range at an emission wavelength em between 400 and 800 nm.
• US6355260 discloses organic or inorganic pigments in the surface is coated with a mineral compound such as a silicic acid polymer or a deposit obtained after hydrolysis of tetraethoxysilane or even a deposition of alumina. The hydrolysis of tetraethoxysilane does not reveal the fluorescence of the organic phase.
• EP-A-581651 discloses spherical colored particles comprising an organic or inorganic pigment coated with a hydrated metal compound obtained by hydrolysis of an alkoxy metal compound. In Examples 1, 4, 6 and 7, pigments are treated by hydrolysis of tetraethoxysilane. JP-A-2002-308716 discloses a red organic pigment 202 coated by hydrolysis of tetraethoxysilane.
• JP-A-2002-309173 discloses organic and inorganic pigments coated with silica obtained by hydrolysis of tetraethoxysilane.
• the subject of the invention is a process for preparing a coated organic pigment comprising the following steps:
• aqueous composition comprising a surfactant chosen from (C 8 -C 16) alkyl sulphate salts and oxyethylenated (C 10 -C 18) alkylol comprising 5 to 40 oxide units; ethylene; c) recovering the coated pigment in powder form.
• a surfactant chosen from (C 8 -C 16) alkyl sulphate salts and oxyethylenated (C 10 -C 18) alkylol comprising 5 to 40 oxide units; ethylene; c) recovering the coated pigment in powder form.
• the subject of the invention is also a coated organic pigment that can be obtained according to the process as defined above.
• the invention also relates to an organic pigment coated with an alkylated silica coating as defined below.
• Another subject of the invention is a cosmetic composition, in particular a make-up composition, comprising, in a cosmetically acceptable medium, at least one coated organic pigment as defined above.
• the subject of the invention is also a process for making up keratin materials, comprising applying to said keratin materials a cosmetic composition as defined above.
• the dopant may be a fluorescent dye such as solvent blue dye and sudan red dye. These dyes are soluble in the fatty substances and do not correspond to an organic pigment which is not soluble in oils, such as isododecane, decamethylcyclopentasiloxane and C12-C15 alcohol benzoates.
• the particles are prepared by encapsulation of the dopant during the sol-gel polymerization of 3-aminopropyltriethoxysilane and vinyltrimethoxysilane in water in the presence of PEG-9 nonyl phenyl ether surfactant (Examples 7 and 8). This document does not recommend encapsulating non-soluble organic pigments in oils in order to improve their fluorescence properties and to obtain makeup products having bright and luminous hues having a good coverage.
• cosmetically acceptable medium means a medium that is compatible with human keratin materials, such as the skin, the lips, the hair, the eyelashes and the nails.
• organic pigment an organic pigment insoluble in water at 25 ° C, especially at a content of 1% by weight and also insoluble in oils selected from isododecane, decamethyl cyclopentasiloxane, C12 alcohol benzoates -C15 such as that sold under the name "Finsolv TN" by the company INNOSPEC ACTIVE CHEMICALS, at 25 ° C, especially at a content of 1% by weight.
• the organic pigments to be coated can be for example:
• the organic lacquer may also be supported by any compatible support such as a mineral support such as particles of alumina, clay, zirconia or metal oxides, in particular zinc oxide or titanium oxide, talc, carbonate of calium, sulphate of barium.
• the mineral support is selected from alumina, titanium oxide and barium sulfate.
• Organic lacquer may also be supported by a carrier such as rosin or aluminum benzoate.
• a carrier such as rosin or aluminum benzoate.
• organic pigments mention may be made of D & C Red No. 7.
• lacquers of natural dyes such as lacquers of curcumin, riboflavin, azorubine, amaranth, chlorophyll, carotenoids such as lycopene, anthocyanins, sorghum and carminic acid.
• the silicon compound of formula (I) described above, used in the process according to the invention, makes it possible to form on the surface of the organic pigment an alkylated silica coating coating. This coating is obtained by hydrolysis and condensation of the silicon compound (I) which occurs after contact with water.
• R 1 denotes a C 1 -C 4 alkyl radical
• R 2 denotes a C 1 -C 6 alkyl radical.
• R2 denotes an alkyl radical Ci - C 4.
• R 1 denotes a C 2 -C 3 alkyl radical and R 2 denotes a C 1 -C 4 alkyl radical.
• R 1 is an ethyl radical and R 2 is a methyl radical.
• the silicon compound (I) may be chosen from methyltriethoxysilane, propyltrimethoxysilane and methyltrimethoxysilane.
• the silicon compound (I) is methyltriethoxysilane.
• the silicon compound (I) forms, after hydrolysis and condensation, an alkylated silica network having repeating units of (S103 / 2 2) type.
• the pigment is coated with a coating comprising an alkylated silica having these repeating units.
• the silicon compound (I) can generally be present in a proportion of from 33 to 99.5% by weight, preferably from 50 to 86% by weight, and especially from 55 to 70% by weight, relative to total weight of the anhydrous mixture.
• the organic pigment can generally be present in an amount of 0.49 to 34% by weight, preferably in a proportion of 5 to 30% by weight, and most preferably in a proportion of 10 to 15% by weight, relative to the total weight of the anhydrous mixture.
• the organic pigment and the silicon compound (I) are used in the preparation method according to the invention in a weight ratio organic pigment / silicon compound (I) ranging from 0.08 to 1, and preferably ranging from 0.3 to 0.8.
• the oil optionally present in the anhydrous mixture may be chosen from the usual oils of the cosmetic field.
• the oil is advantageously an apolar oil, and in particular volatile oil.
• non-polar oil in the sense of this invention means an oil whose solubility parameter at 25 ° C, O a, is 0 (J / cm 3) 1 ⁇ 2.
• ⁇ h characterizes the specific interaction forces (hydrogen bond, acid / base type, donor / acceptor, etc.);
• ⁇ 3 ( ⁇ ⁇ 2 + ô h 2 ) 1 ⁇ 2 .
• apolar hydrocarbon oil is meant an oil formed essentially or even consisting of carbon and hydrogen atoms and free of heteroatoms such as N, O, Si and P.
• the apolar hydrocarbon oil may also be a volatile oil.
• volatile oil is meant an oil capable of evaporating on contact with the skin at room temperature and atmospheric pressure.
• volatile oils of the invention are volatile cosmetic oils which are liquid at ambient temperature and have a non-zero vapor pressure at ambient temperature and atmospheric pressure, in particular ranging from 0.13 Pa to 40,000 Pa (0.001 to 300 mm). Hg) and preferably ranging from 1.3 to 1300 Pa (0.01 to 10 mmHg).
• a non-volatile oil has a vapor pressure of less than 0.13 Pa.
• non-volatile apolar hydrocarbon oils include hydrocarbon oils such as squalene, linear or branched hydrocarbons such as paraffin, petrolatum and naphthalene oils, polybutene, polyisobutene, hydrogenated polyisobutene or partially hydrogenated isoeicosane, squalane, decene / butene copolymers, polybutene / polyisobutene copolymers including Nndopol L-14, polydecenes such as PURESYN 10, and mixtures thereof.
• hydrocarbon oils such as squalene, linear or branched hydrocarbons such as paraffin, petrolatum and naphthalene oils, polybutene, polyisobutene, hydrogenated polyisobutene or partially hydrogenated isoeicosane, squalane, decene / butene copolymers, polybutene / polyisobutene copolymers including Nndopol L-14, poly
• non-volatile hydrocarbon oils also known as glossy oils
• the molecular weight being for example between 650 and 10,000 g / mol, for example:
• volatile apolar hydrocarbon oil include volatile oils bonées hydrocarbyl having from 7 to 16 carbon atoms and mixtures thereof, preferably from 8 to 16 and carbon atoms, especially branched alkanes, C 8 -C 6 like iso-alkanes (also called isoparaffins) C 8 -C 16 , isododecane, isodecane, isohexadecane, and for example the oils sold under the trade names Isopars or permetyls, and their mixtures.
• volatile oils bonées hydrocarbyl having from 7 to 16 carbon atoms and mixtures thereof, preferably from 8 to 16 and carbon atoms, especially branched alkanes, C 8 -C 6 like iso-alkanes (also called isoparaffins) C 8 -C 16 , isododecane, isodecane, isohexadecane, and for example the oils sold under the trade names Isopars or permetyls, and their mixture
• the apolar oils, volatile or nonvolatile, suitable for the invention may be chosen from polybutene, polyisobutene, hydrogenated polyisobutene, isododecane, isohexadecane, and mixtures thereof.
• apolar hydrocarbon volatile oil mention may be made of volatile hydrocarbon oils having from 7 to 15 carbon atoms and mixtures thereof, and especially linear C7-C15 alkanes.
• the "volatile linear alkanes" that are suitable for the invention comprise from 8 to 14 carbon atoms.
• the "volatile linear alkanes" that are suitable for the invention comprise from 9 to 14 carbon atoms.
• the "volatile linear alkanes" that are suitable for the invention comprise from 10 to 14 carbon atoms.
• the "volatile linear alkanes" that are suitable for the invention comprise from 1 to 14 carbon atoms.
• the volatile linear alkanes that can be used in the compositions according to the invention can in particular have a non-zero vapor pressure (also called saturated vapor pressure) at room temperature, in particular a vapor pressure ranging from 0.3 Pa to 6000 Pa.
• a non-zero vapor pressure also called saturated vapor pressure
• the "volatile linear alkanes" that are suitable for the invention have a vapor pressure ranging from 0.3 to 2000 Pa at ambient temperature (25 ° C.).
• the "volatile linear alkanes" that are suitable for the invention have a vapor pressure ranging from 0.3 to 1000 Pa at room temperature (25 ° C.).
• the "volatile linear alkanes" suitable for the invention have a vapor pressure ranging from 0.4 to 600 Pa, at room temperature (25 ° C.).
• the "volatile linear alkanes" that are suitable for the invention have a vapor pressure ranging from 1 to 200 Pa at room temperature (25 ° C.).
• the "volatile linear alkanes" suitable for the invention have a vapor pressure ranging from 3 to 60 Pa, at room temperature (25 ° C).
• alkanes which are suitable for the invention, mention may be made of the alkanes described in the patent applications of Cognis WO 2007/068371, or WO2008 / 155059 (distinct alkane mixtures and differing from at least a carbon). These alkanes are obtained from fatty alcohols, themselves obtained from coconut oil or palm oil.
• linear alkanes which are suitable for the invention, mention may be made of n-heptane (C7), n-octane (C8), n-nonane (C9), n-decane (C10), n-undecane (C1 1), n-dodecane (C12), n-tridecane (C13), n-tetradecane (C14), and mixtures thereof.
• the volatile linear alkane is selected from n-nonane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, and mixtures thereof.
• n-undecane (C1 1) and n-tridecane (C13) obtained in Examples 1 and 2 of Application WO2008 / 155059 from Cognis. Mention may also be made of n-dodecane (C12) and n-tetradecane (C14) sold by Sasol respectively under the references PARAFOL 12-97 and PARAFOL 14-97, as well as their mixtures.
• the oil may be present in the anhydrous mixture in a content ranging from 0 to 60% by weight, relative to the total weight of the anhydrous mixture, and preferably ranging from 5 to 50% by weight.
• the aqueous phase used in the preparation process according to the invention contains a surfactant as defined above.
• the surfactant may be chosen from (C 8 -C 16) alkyl sulphate salts, especially chosen from said sodium, potassium, magnesium and ammonium salts.
• the surfactant is in particular chosen from (C 10 -C 14) alkyl salts, especially chosen from said sodium, potassium, magnesium and ammonium salts.
• the surfactant is chosen from lauryl sulfate salts, in particular chosen from said sodium, potassium, magnesium and ammonium salts.
• the surfactant is sodium lauryl sulphate.
• the surfactant may also be selected from alkyl ⁇ CQ-C ⁇ Q) phenol having from 5 to 40 ethylene oxide units.
• the surfactant is chosen from ethoxylated octylphenol having from 5 to 40 ethylene oxide units.
• the following compounds may be used as surfactants:
• Octylphenol ethoxylated with 30 units of ethylene oxide INCI name OCTOXYNOL- 30; like Triton X-305 from Dow Chemical Company
• Octylphenol ethoxylated with 40 ethylene oxide units INCI name OCTOXYNOL- 40; as Triton X-405 from Dow Chemical Company
• Triton X-405 from Dow Chemical Company
• ⁇ ethoxylated octylphenol having 8 to 16 ethylene oxide units is used.
• ethoxylated octylphenol having 9 ethylene oxide units is used.
• the surfactant may be present in the aqueous composition used in the preparation process in a content ranging from 0.1 to 5% by weight, preferably ranging from 0.2 to 1.5% by weight, relative to the weight total of the aqueous composition.
• the aqueous composition may comprise a nonionic water-soluble thickening agent, especially in a content ranging from 0.1% to 10% by weight, relative to the total weight of the aqueous phase.
• water-soluble nonionic thickeners which can be used according to the invention, mention may be made of:
• water-soluble cellulosic thickeners such as hydroxyethylcellulose, methylcellulose, hydroxypropylcellulose;
• nonionic guar gums comprising hydroxyC 1-6 alkyl groups.
• hydroxymethyl, hydroxyethyl, hydroxypropyl and hydroxybutyl groups are sold, for example, under the trade names Jaguar HP8, Jaguar HP60 and Jaguar HP120 and Jaguar HP 105 by the company Mehhall, or under the name GALACTASOL 40H4FD2 by the company AQUALON; xanthan, carob, scleroglucan and gellan gums,
• polyvinyl alcohol is used.
• the process for preparing the coated organic pigment according to the invention comprises the following steps:
• aqueous composition comprising a surfactant selected from the alkyl (CQ-C10) sulphate salts and the alkyl (Ce-
• Oxyethylenated phenol comprising from 5 to 40 ethylene oxide units
• the final mixture can be allowed to act at a temperature ranging from 10 ° C. to 30 ° C., especially at room temperature (25 ° C.).
• the agitation of said mixture can last from 5 minutes to 1 hour.
• the product resulting from the contact of the silicon compound (I) with the water is deposited on the organic pigment and coats the latter forming an alkylated silica type coating.
• the reaction medium may then be filtered or centrifuged and the filtrate collected is washed, in particular with water. After drying, a powder is obtained.
• the final mixture, the organic pigment, the silicon compound (I) and water is advantageously stirred efficiently to prevent the formation of agglomerates and / or to break up the agglomerates as and when they occur. measure of their formation.
• a coated organic pigment powder is obtained.
• said final mixture can be treated with ultrasound to break up the agglomerates that may form during the reaction.
• the average size of the coated organic pigment particles may range from 0.1 ⁇ to 500 ⁇ , preferably from 1 ⁇ to 500 ⁇ , and preferably from 1 ⁇ to 100 ⁇ .
• the content of the coating product in the coated organic pigment can range from 20% to 300% by weight, based on the weight of the organic pigment (uncoated), and preferably from 80% to 150% by weight.
• the coated organic pigment may be present in the cosmetic composition according to the invention in a content ranging from 0.1% to 99% by weight, relative to the total weight of the composition, preferably from 0.5% to 80% by weight. weight, and better from 1% to 60% by weight.
• the cosmetic composition according to the invention may be in the form of a water-in-oil or oil-in-water emulsion, a free or compacted powder, a cast powder, a solid stick, a paste or an organic or aqueous lotion. .
• the composition may further include other ingredients commonly used in cosmetic compositions.
• Such ingredients may be chosen from preservatives, perfumes, sunscreens, oils, waxes, thickeners, film-forming polymers, moisturizers, vitamins, proteins, ceramides, surfactants, antioxidants, anti-free radical agents, organic solvents, water, mineral pigments.
• Example 1 a) Coated organic pigment:
• CM 5850 methyltriethoxysilane
• MTES methyltriethoxysilane
• 0.45 g of oxyethylenated octylphenol (9 units of ethylene oxide) (TRITON® X100 from Dow Chemical) were solubilized in 100 g of water.
• This aqueous phase was emulsified with the organic phase using a stator rotor at 13500 rpm for 10 minutes. At the end of emulsification, the emulsion was kept under magnetic stirring, and 0.17 g of 0.1 M HCl was added. After 10 minutes, 0.21 g of a 20% aqueous ammonia solution was added.
• the mixture was stirred for 24 hours, then centrifuged for 30 minutes at 4000 rpm, washed with water, and then centrifuged again.
• the powder obtained was recovered on filter paper and then dried in air.
• the fluorescence of the coated pigment obtained was evaluated under a 365 nm UV lamp: the pigment exhibited an exalted fluorescence.
• the fluorescence of the coated pigment obtained in comparison with that of the uncoated pigment was evaluated under a 365 nm UV lamp: the coated pigment exhibits an enhanced fluorescence.
• the emulsion was kept under magnetic stirring, and 0.17 g of 0.1 M HCl was added. After 10 minutes, 0.21 g of an aqueous ammonia solution at 20% by weight are added. The mixture was stirred for 24 hours, then centrifuged for 30 min at 4000 rpm, washed with water, and then centrifuged again. The powder obtained was recovered on filter paper and then dried in air.
• the fluorescence of the coated pigment obtained in comparison with that of the uncoated pigment was evaluated under a 365 nm UV lamp: the coated pigment exhibits an enhanced fluorescence.
• the fluorescence of the coated pigment obtained in comparison with that of the uncoated pigment was evaluated under a 365 nm UV lamp: the coated pigment exhibits an enhanced fluorescence.
• Example 5 (except invention) 0.56 g of D & C red No. 7 (INCI name CM 5850) was dispersed in 1 g of methyltriethoxysilane and 9 g of tetraethylorthosilicate to form an organic phase. 0.45 g of octylphenol oxyethylenated (9 units of ethylene oxide) (TRITON® X100 from Dow Chemical) were solubilized in 100 g of water. This aqueous phase was emulsified with the organic phase using a stator rotor at 13500 rpm for 10 min. At the end of emulsification, the emulsion was kept under magnetic stirring, and 0.17 g of 0.1 M HCl was added.
• octylphenol oxyethylenated (9 units of ethylene oxide) (TRITON® X100 from Dow Chemical) were solubilized in 100 g of water.
• This aqueous phase was emulsified with the organic phase
• the fluorescence of the coated pigment obtained was evaluated under a UV lamp 365 nm: the fluorescence is not enhanced in comparison with that of the uncoated pigment.
• Example 6 (outside the invention) 0.56 g of D & C red No. 7 (INCI name CM 5850) was dispersed in 9 g of methyltriethoxysilane and 1 g of tetraethylorthosilicate to form an organic phase. 0.45 g of octylphenol oxyethylenated (9 units of ethylene oxide) (TRITON® X100 from Dow Chemical) were solubilized in 100 g of water. This aqueous phase was emulsified with the organic phase using a stator rotor at 13500 rpm for 10 min. At the end of emulsification, the emulsion is kept under magnetic stirring, and 0.17 g of 0.1 M HCl is added.
• octylphenol oxyethylenated (9 units of ethylene oxide) (TRITON® X100 from Dow Chemical) were solubilized in 100 g of water.
• This aqueous phase was emulsified with the
• the fluorescence of the coated pigment obtained was evaluated under a UV lamp 365 nm: the fluorescence is not enhanced in comparison with that of the uncoated pigment.
• CM 5850 0.56 g of D & C red No. 7 (INCI name CM 5850) was dispersed in 10 g of methyltriethoxysilane to form an organic phase. 0.45 g of condensate of ethylene oxide and of propylene oxide and ethylene oxide (75 EO / 30 OP / 75 EO) (PLURACARE / PLURONIC F 68 PRILL from BASF) were solubilized in 100 g of water. This aqueous phase was emulsified with the organic phase using a stator rotor at 13500 rpm for 10 min. At the end of emulsification, the emulsion was kept under magnetic stirring, and 0.17 g of 0.1 M HCl was added.
• Example 8 (excluding the invention):
• the emulsion was kept under magnetic stirring, and 0.17 g of 0.1 M HCl was added. After 10 minutes, 0.21 g of a solution of NH 3 at 20% is added. The mixture was stirred for 24 hours, then centrifuged for 30 min at 4000 rpm, washed with water, and then centrifuged again. The powder obtained was recovered on filter paper and then dried in air.
• Example 9 (excluding the invention):
• CM 5850 0.56 g of D & C red No. 7 (INCI name CM 5850) was dispersed in 10 g of methyltriethoxysilane to form an organic phase. 0.45 g of ethylene oxide condensate and of propylene oxide and ethylene oxide (17 EO / 60 OP / 17 EO) (PLURONIC P 103 from BASF) were solubilized in 100 g of water. This aqueous phase was emulsified with the organic phase using a stator rotor at 13500 rpm for 10 minutes. At the end of emulsification, the emulsion was kept under magnetic stirring, and 0.17 g of 0.1 M HCl was added.
• the fluorescence of the coated pigment obtained was evaluated under a UV lamp 365 nm: the fluorescence is not enhanced in comparison with that of the uncoated pigment.
• a nail polish having the following composition was prepared:

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