White composition and its use in various formulations, particularly cosmetic formulations

Abstract

The present invention relates to a composition intended to replace TiO2, a method for preparing the composition, and its use. In particular, the present invention relates to a water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride, and at least one other inorganic compound, wherein the mixture of bismuth oxychloride and boron nitride is at least 50% by weight based on the total weight of the composition. The composition can replace titanium dioxide and is suitable for various applications, particularly cosmetic applications. The present invention also relates to a method for preparing the composition and its use.

Description

[Technical Field]

[0001] The present invention relates to the technical field of pigments. The object of the present invention is in particular a specific white composition that can replace titanium dioxide (TiO2), especially in cosmetics. The present invention also relates to a method for preparing this composition and its use. [Background technology]

[0002] Pigments are essential in the composition of certain products to impart color. They are particularly widely used in cosmetics, where they add color and opacity to the final product. In makeup products, pigments are essential because they contribute to the appearance of skin or nails. Pigments are also present in hair color products or skin care products to impart a specific color to the skin.

[0003] Pigments are solid, insoluble molecules. They can be of animal, vegetable or synthetic origin and can be inorganic or organic in nature.

[0004] The most widely used pigments in industry today are those of inorganic origin. Indeed, their resistance to light and their low cost make them highly sought-after materials. They consist of dry-ground minerals, generally metals or metal salts. Due to their composition, inorganic pigments are generally more opaque and insoluble than organic pigments.

[0005] Among the commonly used inorganic pigments, particular mention may be made of TiO2, an inorganic pigment used in powder form in numerous applications due to its unparalleled white color and numerous other properties such as ultraviolet absorption, opacifying properties, resistance to chemicals, thermal stability and photocatalytic ability.

[0006] Due to its outstanding properties, TiO2 is used in the formulation of a wide variety of end products such as paints, inks, pharmaceuticals, toothpaste, construction products (buildings and utilities), and in formulations for cosmetics.

[0007] As regulations evolve, more and more research is focusing on the harmlessness of pigments to humans and the environment. Some recent studies have shown the carcinogenic potential of TiO2 through inhalation.

[0008] In the cosmetic field, TiO2 is no longer used in the form of small particle powder in certain formulations such as sprays in order to avoid inhalation.

[0009] Although the use of TiO2 in products for topical application is not prohibited, manufacturers, especially in the cosmetics industry, are still seeking new compounds to provide alternatives to the ubiquitous use of TiO2 that are suitable for use on the skin and skin appendages. Summary of the Invention

[0010] To meet this need, the present invention proposes novel compositions that can provide an alternative to TiO2, particularly suitable for use in cosmetics.

[0011] In particular, an object of the present invention is therefore a water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, the mixture of bismuth oxychloride and boron nitride representing at least 50% by weight relative to the total weight of the composition.

[0012] Advantageously, the presence of at least 50% bismuth oxychloride and boron nitride in the composition according to the invention allows the composition to exhibit transparency and opacity similar to the properties of titanium dioxide.

[0013] Preferentially, the composition according to the invention has an L of more than 88 * It has a transparency defined by the parameters, an opacity of greater than 82%, and comprises a mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound.

[0014] Preferentially, the composition according to the invention is in powder form.

[0015] It has properties similar to those of TiO2, i.e., L > 88 * It has a transparency defined by parameters and an opacity of greater than 82%.

[0016] Bismuth oxychloride is a water-insoluble inorganic pigment derived from copper, tin, or lead. It is used in many cosmetic applications, especially eye shadow, lipstick, and nail polish. Bismuth oxychloride has a pH of 85. * It has transparency and 85% opacity. Therefore, the use of bismuth oxychloride alone is insufficient to constitute a replacement for TiO2, especially in cosmetics.

[0017] Boron nitride is a white chemical compound used in many fields, especially in cosmetics. Due to its structural properties, boron nitride can take on various shapes, especially lamellar or honeycomb shapes. This so-called hexagonal structure gives boron nitride a soft, silky feel and improves the spreadability of formulations containing it, especially on the skin. Boron nitride has an L of 90. * It has transparency and an opacity of 86%. Therefore, the use of boron nitride alone is insufficient to constitute a replacement for TiO2, especially in cosmetics.

[0018] Advantageously, the combination of compounds according to the invention makes it possible to produce a synergistic effect on the transparency and / or opacity of the composition that is greater than the transparency and / or opacity of each of the compounds that make up the composition taken individually.

[0019] The compositions according to the invention have a transparency suitable for use as a replacement for TiO2, especially in cosmetic formulations, pharmaceuticals, inks and paints.

[0020] According to a particularly preferred embodiment, the composition according to the invention comprises a mixture of at least four inorganic compounds.

[0021] Preferentially, the composition according to the invention also comprises, in addition to the mixture of bismuth oxychloride and boron nitride, at least one other inorganic compound chosen from iron oxide, zinc oxide, cerium oxide, calcium carbonate, tricalcium phosphate, calcium sulfate, zinc stearate, magnesium carbonate, zinc sulfate, magnesium stearate, barium sulfate, zinc sulfide, aluminum powder, calcined clay, tricalcium phosphate, kaolin and combinations thereof.

[0022] According to a preferred embodiment of the present invention, the composition has an oil absorption of less than 55%.

[0023] Such compositions are particularly useful in providing an alternative to the use of TiO2 in a variety of formulations and applications, particularly in cosmetics.

[0024] In another aspect, the present invention relates to a method for producing a composition according to the invention, which method comprises, in particular, the steps of selecting the compounds that constitute the composition according to the invention, mixing said components, and recovering the composition according to the invention.

[0025] Finally, the present invention also encompasses the use of the compositions according to the invention in inks, paints, plastics and cosmetic formulations.

[0026] Further features and advantages will become apparent from the detailed description of the invention and the examples which are illustrative only and do not limit the scope of the invention in any way. DETAILED DESCRIPTION OF THE INVENTION

[0027] definition For the purposes of the present invention, "transparency" refers to a measure of the whiteness of the color under study. The darker the color, the lower the transparency. To measure transparency, it is necessary to deposit the composition according to the invention on a black background contrast card by forming a film of uniform thickness. Measurements are obtained using a spectrophotometer equipped with an integrating sphere and a D65 light source. *The closer the parameter is to 100, the whiter the composition.

[0028] For the purposes of this invention, "opacity" refers to the ability of a composition to conceal a surface covered by a given amount. Opacity is measured by its hiding power. Opacity can be measured by calculating the contrast ratio on a black and white background. The composition can be applied to a known thickness using a film applicator. After a drying period, a spectrophotometer measures the reflectance values ​​of the overlay on a white background (Yw) and on a black background (Yb). The opacity of a composition is thus measured by calculating the contrast ratio Yb / Yw, expressed as a percentage.

[0029] For purposes of the present invention, "reflectance" means a measure of the percentage of light reflected from a surface.

[0030] For the purposes of the present invention, "oil absorption" means the amount of linseed oil (in grams) absorbed by 100 g of a composition according to the invention to obtain a firm, homogeneous paste. More specifically, the determination of oil absorption according to the present invention consists in mixing a composition according to the present invention with a minimum amount of linseed oil to obtain a plastic mass (powder + oil) that is easily separated from the support on which the mixing is carried out (spatula and / or glass plate). The higher this value, the more oil the composition absorbs.

[0031] For the purposes of the present invention, "film-forming polymer" means a polymer that is capable of forming, by itself or in the presence of an auxiliary film-forming agent, a continuous, adherent film on a substrate, in particular on keratinous materials.

[0032] For the purposes of the present invention, "wax" means a fatty substance with a reversible liquid / solid phase change, with a melting temperature above 55°C and generally below 110°C, which is liquid under the conditions for preparing the formulations according to the invention and has an anisotropic crystalline structure in the solid state. Waxes can be polar or non-polar.

[0033] For purposes of the present invention, "polar wax" means a wax that contains at least one heteroatom such as oxygen, nitrogen, silicon or phosphorus.

[0034] For the purposes of the present invention, "non-polar wax" means hydrocarbon waxes and / or silicone waxes.

[0035] For the purposes of the present invention, "filler" means any insoluble particle, inorganic or organic, of any shape (in particular spherical or lamellar) in the formulation.

[0036] composition An object of the present invention is therefore a water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, the mixture of bismuth oxychloride and boron nitride representing at least 50% by weight relative to the total weight of the composition.

[0037] According to one embodiment of the present invention, the composition according to the invention comprises a mixture of bismuth oxychloride and boron nitride representing at least 55% by weight, preferentially at least 60% by weight, even more preferentially at least 70% by weight and in particular 75% by weight relative to the total weight of the composition.

[0038] According to another embodiment, the composition according to the invention comprises a mixture of bismuth oxychloride and boron nitride representing from 50 to 95% by weight, in particular from 65 to 95% by weight and more preferentially from 80 to 95% by weight relative to the total weight of the composition.

[0039] Advantageously, the content of the mixture of bismuth oxychloride and boron nitride is essential to provide transparency and opacity comparable to that of TiO2.

[0040] According to a particularly preferred embodiment, the composition according to the invention is free of TiO2.

[0041] According to another preferred embodiment, the composition according to the invention has an L of more than 88 *It has a transparency measured on a black background defined by parameters and an opacity of greater than 82%.

[0042] Preferentially, the composition according to the invention has an L of more than 90 * It has a transparency measured on a black background defined by parameters and an opacity of greater than 82%.

[0043] The transparency of the compositions according to the invention is measured against a black background using an integrating sphere spectrophotometer under D65 illumination, with the chromaticity coordinates L from the CIELAB color space, commonly known as CIE 1976. * It is evaluated by measuring

[0044] Preferably, the composition according to the invention has an L of more than 90, in particular more than 91 and preferentially more than 95. * It has transparency.

[0045] Advantageously, the more transparent the composition according to the invention, the whiter it is.

[0046] The opacity of the compositions according to the invention is evaluated by measuring their hiding power using a spectrophotometer that measures the reflectance values ​​of the compositions applied on a white background (Yw) and a black background (Yb).

[0047] Preferably, the composition according to the invention has an opacity of more than 85%, in particular more than 87%, preferentially more than 90% and even more preferentially more than 92%.

[0048] According to a preferred embodiment, the composition according to the invention has a transparency L of more than 91. * and / or an opacity of more than 88%. According to a particularly preferred variant, the composition according to the invention has a transparency L of 92 or more. * , and has an opacity of 90% or more.

[0049] Preferentially, the composition according to the invention has a higher transparency and / or a higher opacity than each of the compounds that make up the composition.

[0050] Advantageously, the compounds selected have an L * It has a synergistic effect on parameters and opacity.

[0051] When the composition is used in an ink or paint, the composition according to the invention advantageously retains its properties, especially its transparency and its opacity, even after drying. After application, the composition according to the invention can form a dry film that retains its structure, especially its opacity and its transparency.

[0052] The composition according to the invention comprises a mixture of at least three, preferably at least four, and even more preferably at least five inorganic compounds.

[0053] Preferably, the composition according to the present invention also comprises, in addition to the mixture of bismuth oxychloride and boron nitride, at least one other inorganic compound selected from iron oxide, zinc oxide, cerium oxide, calcium carbonate, tricalcium phosphate, calcium sulfate, zinc stearate, magnesium carbonate, zinc sulfate, magnesium stearate, barium sulfate, zinc sulfide, aluminum powder, calcined clay, kaolin, and combinations thereof.

[0054] According to a particularly preferred embodiment, the composition according to the invention also comprises, in addition to the mixture of bismuth oxychloride and boron nitride, at least one other inorganic compound selected from zinc stearate, zinc sulfate, zinc oxide, zinc sulfide, and combinations thereof.

[0055] Preferably, the composition according to the invention comprises zinc sulfate and / or zinc oxide in addition to the mixture of bismuth oxychloride and boron nitride.

[0056] According to another preferred embodiment, the composition according to the invention has an oil absorption of less than 55%, preferentially less than 40%, in particular between 25 and 55%, even more preferentially between 35 and 45%.

[0057] Advantageously, the oil-absorbing properties of the composition according to the invention facilitate its incorporation into cosmetic formulations.

[0058] According to another embodiment, the composition according to the invention comprises a coating. When the composition according to the invention comprises a coating, the coating is selected from a hydrophobic coating, a hydrophilic coating, an oleophobic coating or an oleophilic coating.

[0059] In the context of the present invention, the coating is preferentially a coating of natural origin.

[0060] Preferentially, when the composition according to the invention comprises a coating, the coating comprises at least one molecule selected from: * Silicone derivatives preferably selected from triethoxycaprylylsilane, dimethicone and methicone, * a fatty acid ester derivative preferably selected from stearoyl glutamic acid, polyhydroxystearic acid, hydrogenated olive oil stearyl ester, magnesium myristate, jojoba ester, lecithin, hydrogenated lecithin, aloe vera oil extract and avocado oil; * a wax preferably chosen from carnauba wax, polyethylene wax or olefin-like wax, * silane derivatives, preferably selected from methoxy PEG-10 propyl trimethoxy silane, * silica, * Phytic acid, inositol dihydrogen phosphate, * Metal salts of fatty acids, * Metal alcoholates, * polysaccharides, * Alkyl titanates, * natural or mineral oils, *Amino acids or amino acid derivatives, such as lauroyl lysine, alone or in combination with aluminum hydroxide; * a fatty acid stearic acid derivative, preferably isopropyl titanium triisostearate, and * Fluorosilanes, preferably perfluorohexylethyltriethoxysilane.

[0061] Advantageously, the coating of the composition according to the invention facilitates the dispersion of the composition in cosmetic formulations. Those skilled in the art can choose the type of coating based on the nature of the formulation and its intended use, in particular cosmetic applications.

[0062] Preferentially, the composition according to the invention is in powder form.

[0063] The compositions according to the invention are therefore particularly suitable for replacing TiO2 in cosmetic preparations.

[0064] According to another aspect, the composition according to the invention is a method for producing the composition, the method comprising the steps of: a) selecting the compounds constituting the composition according to the invention: bismuth oxychloride, boron nitride, and at least one other inorganic compound; b) mixing the compounds selected in step a) by sequential addition; and c) recovering a water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride, and at least one other inorganic compound, wherein the mixture of bismuth oxychloride and boron nitride is at least 50 wt. % based on the total weight of the composition.

[0065] The present invention also relates to a formulation comprising a composition according to the invention.

[0066] Preferentially, the formulation according to the invention does not contain titanium dioxide.

[0067] According to one embodiment, the formulation according to the invention comprises from 0.1 to 20% by weight, preferentially from 0.5 to 10%, and even more preferentially from 1 to 8% of the composition according to the invention relative to the total weight of the formulation.

[0068] Advantageously, the amount of the composition according to the invention that needs to be added to a formulation to replace TiO2 while obtaining transparency and opacity similar to those of the same formulation containing TiO2 is less than four times, and preferentially less than three times, the amount of TiO2 present in the formulation.

[0069] Advantageously, the amount of the composition according to the present invention added to the formulation to obtain a white color and hiding power similar to that of TiO2 is less than the amount of the coloring material of the prior art that does not exhibit the desired colorimetric properties. However, the larger proportion in the cosmetic formulation entails additional constraints such as surface tension, texture, hardness, or oil absorption. The formulation according to the present invention can comprise a cosmetically acceptable medium that can be applied to the skin, lips, or eyelashes without causing discomfort to the user.

[0070] The formulations according to the invention may in particular take the form of a mascara formulation, a lipstick or lip gloss formulation, an eye shadow and / or cheek shadow formulation, or alternatively a foundation formulation or a face or body care product.

[0071] Preferably, the formulations according to the invention can be provided in any form suitable for the cosmetic field, in particular in the form of a powder, emulsion, microemulsion, nanoemulsion, suspension, solution, lotion, cream, aqueous or hydroalcoholic gel, foam, serum, aerosol solution or dispersion, or lipid vesicle dispersion, or droplets obtained by coacervation or microfluidics.

[0072] According to one embodiment, the formulation according to the invention is in the form of an anhydrous formulation, ie it contains less than 5% by weight of water, preferentially less than 1% by weight of water.

[0073] According to another embodiment, the formulation according to the invention takes the form of a water-in-oil or oil-in-water emulsion.

[0074] The formulations according to the invention may also comprise, in addition to the composition according to the invention, at least one additive chosen from emollients, humectants, gelling and / or thickening agents, film-forming agents, surfactants, oils, non-volatile organic solvents, fillers, waxes, active agents, colorants, preservatives, antioxidants, organic or inorganic powders, sunscreens and fragrances.

[0075] If the formulation according to the invention comprises at least one wetting agent, the at least one wetting agent is selected from: polyols, such as glycerin, diglycerin, propylene glycol, caprylyl glycol, pentylene glycol or hexanediol, -sugar, glycosaminoglycans, such as hyaluronic acid and its salts and esters, and -Polyquaterniums, such as Lipidure-PMB.

[0076] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one wetting agent having a content of 0 to 30%, preferably 0.005 to 10%, of the total weight of the formulation.

[0077] When the formulation according to the invention comprises at least one emollient, the at least one emollient is selected from: esters, such as jojoba esters, fatty acid esters and fatty alcohol esters, preferentially selected from octyldodecyl myristate, triethylhexanoin, dicaprylyl carbonate and isostearyl isostearate, caprylic / capric triglyceride, butters, such as shea butter, preferentially butyrospernum parkii butter extract, shea butter ethyl ester, commercially available under the names LIPEX SHEASOFT, LIPEX SHEA-U, LIPEX SHEA, LIPEX SHEALIGHT, LIPEX SHEA TRIS, or moringa butter, preferentially moringa oil / hydrogenated moringa oil esters; waxes preferentially selected from among acacia decurrens flower wax, sunflower seed wax (helianthus annuus cera seed wax), and C10-18 triglycerides; -vegetable oil, -Phytosqualane - an alkane preferentially chosen from undecane and tridecane.

[0078] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one emollient having a content of 0.1 to 30%, preferably 0.5 to 10%, of the total weight of the formulation.

[0079] If the formulation according to the invention comprises at least one gelling agent and / or thickening agent, the at least one gelling agent and / or thickening agent is selected from: cellulose derivatives, preferentially chosen from gums of plant origin such as guar, carob, alginates, carrageenans, pectins, and gums of microbial origin such as xanthan, - Clay such as Laponite - crosslinked or not, hydrophilic or amphiphilic homo- and copolymers acryloylmethylpropanesulfonic acid (AMPS) and / or acrylamide and / or acrylic acid and / or acrylate salts or esters (sold under the names ARISTOFLEX AVC, Aristoflex AVS, Aristoflex HMB, SIMULGEL NS, Simulgel EG, Simulgel 600, Simulgel 800, Pemulen, carbopol, Sepiplus 400, Seppimax zen, Sepiplus S, COSMEDIA SP).

[0080] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one gelling agent and / or thickening agent having a content of 0.1 to 10% of the total weight of the formulation.

[0081] If the formulation according to the invention comprises at least one surfactant, the at least one surfactant is selected from: anionic surfactants, such as isethionates, taurates, sarcosinates, glycinates, glutamates, phosphates (C20-22 alkyl phosphates available commercially under the name SENSANOV WR), - amphoteric surfactants such as betaine derivatives, amphoacetates, non-ionic surfactants, such as polyglycerol derivatives, sugar derivatives, such as glucoside or xyloside derivatives (commercially available under the names MONTANOV 68, MONTANOV 202, Montanov 82, MONTANOV L, EASYNOV), lecithin.

[0082] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one surfactant having a content of 0.1 to 15%, preferably 0.5 to 10%, of the total weight of the formulation.

[0083] If the formulation according to the invention comprises at least one film-forming polymer, the at least one film-forming polymer is chosen from: synthetic polymers, such as radical-like or polycondensate-like polymers, Polymers of natural origin and their mixtures, preferentially acrylic polymers, polyhydroxyalkanoates (PHAs), polyurethanes, polyesters, polyamides, polyureas and cellulosic polymers such as nitrocellulose.

[0084] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one film-forming polymer having a content of 0.5 to 20% of the total weight of the formulation.

[0085] Advantageously, the film-forming polymer improves the staying power and non-transfer properties of the formulations according to the invention, especially in make-up formulations.

[0086] According to one embodiment of the invention, the formulation comprises, in addition to the composition according to the invention, at least one non-volatile oil or organic solvent chosen from non-volatile hydrocarbons and / or silicone oils.

[0087] If the composition comprises at least one oil or non-volatile organic solvent, it has a content of 0.01 to 30% by weight, preferentially 0.1 to 25%, in particular 0.1 to 20% relative to the total weight of the formulation.

[0088] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one non-volatile organic oil or solvent, having a content of 0.01 to 30% by weight, preferentially 0.1 to 25%, in particular 0.1 to 20% relative to the total weight of the formulation.

[0089] According to another embodiment, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one wax having a content of 0.5 to 20%, preferably 1 to 10%, of the total weight of the formulation.

[0090] When the formulation according to the present invention contains at least one filler, the at least one filler is selected from talc, mica, silica, kaolin, boron nitride, starch, octenylsuccinic anhydride-modified starch, polyamide, silicone resin, silicone elastomer powder, and acrylic polymer powder, such as polymethyl methacrylate. The fillers used in the formulation according to the present invention can be composed of several layers of different chemical nature and / or physical form, and in particular can be in the form of lamellae coated with spherical fillers. They can be modified using various surface treatments.

[0091] According to one embodiment, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one coloring substance chosen from pigments or mother of pearl.

[0092] When the formulation according to the invention comprises at least one coloring substance, including a pigment, the pigment may be white or colored, inorganic and / or organic, coated or uncoated.

[0093] The pigments are preferentially chosen from zirconium, zinc or cerium oxides, and iron or chromium oxides, manganese violet, ultramarine blue, chromium hydroxide and ferric blue, carbon black, D&C-like pigments, and lacquers based on cochineal carmine, barium, strontium, calcium or aluminium.

[0094] The pearlescent pigments may be preferentially chosen from white pearlescent pigments, such as mica coated with titanium or bismuth oxychloride, colored pearlescent pigments, such as titanium mica with iron oxide, in particular titanium mica with ferric blue or chromium oxide, titanium mica with organic pigments of the type mentioned above, as well as pearlescent pigments based on bismuth oxychloride.

[0095] Other additives normally used in cosmetics may also be present in the formulations according to the invention, in particular preservatives, antioxidants or fragrances well known in the art.

[0096] From all of these possible additives, one skilled in the art can select both the nature and the amount of any additives to be added to the composition so that the composition retains all of its properties.

[0097] According to another object, the present invention provides a method for producing a medicament having an L of more than 90 * The present invention relates to a composition having a transparency defined by the parameters, an opacity of greater than 80%, comprising a mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound.

[0098] process Also, according to another aspect, the object of the present invention is a method for producing a composition according to the invention, comprising at least the following steps: a) selecting the compounds that make up the composition according to the present invention: bismuth oxychloride, boron nitride, and at least one other inorganic compound; b) mixing the compounds selected in step a) by sequential addition; and c) recovering a water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride, and at least one other inorganic compound, wherein the mixture of bismuth oxychloride and boron nitride is at least 50 wt. % based on the total weight of the composition.

[0099] The compounds from step a) are different inorganic compounds: at least bismuth oxychloride and boron nitride, and at least one other inorganic compound selected from the following: iron oxide, zinc oxide, cerium oxide, calcium carbonate, tricalcium phosphate, calcium sulfate, zinc stearate, magnesium carbonate, zinc sulfate, magnesium stearate, barium sulfate, zinc sulfide, aluminum powder, calcined clay, tricalcium phosphate, kaolin, and combinations thereof.

[0100] The mixing in step b) is carried out by convection, diffusion or mechanical dispersion; preferentially, the mixing in step b) is carried out using a powder mixer.

[0101] Advantageously, the powder mixer makes it possible to mix the composition according to the invention without it grinding against the walls.

[0102] Preferably, the mixing in step b) is carried out in a powder mixer at a speed of 1 to 20 rpm, preferentially 1 to 10 rpm, even more preferentially 10 rpm.

[0103] Advantageously, the mixing speed in step b) makes it possible to obtain a homogeneous mixture.

[0104] Preferentially, the mixing in step b) is carried out for a period of between 1 and 10 hours, preferentially between 1 and 5 hours, and even more preferentially for 2 hours.

[0105] According to a particularly preferred embodiment, the mixing in step b) is carried out using a powder mixer at a speed of 5 rpm for 2 hours.

[0106] Advantageously, the mixing in step b) makes it possible to obtain a homogeneous composition.

[0107] According to one embodiment, the method according to the invention comprises a step d) of surface treatment. The surface treatment step, also known as coating, can be hydrophobic, hydrophilic, oleophobic or oleophilic.

[0108] The surface treatment step d) can be carried out using: * Silicone derivatives preferably selected from triethoxycaprylylsilane, dimethicone and methicone, * a fatty acid ester derivative preferably selected from stearoyl glutamic acid, polyhydroxystearic acid, hydrogenated olive oil stearyl ester, magnesium myristate, jojoba ester, lecithin, hydrogenated lecithin, aloe vera oil extract and avocado oil; *a wax preferably chosen from carnauba wax, polyethylene wax or olefin-like wax, * silane derivatives, preferably selected from methoxy PEG-10 propyl trimethoxy silane, * silica, * Phytic acid, inositol dihydrogen phosphate, * Metal salts of fatty acids, * Metal alcoholates, * polysaccharides, * Alkyl titanates, * natural or mineral oils, * Amino acids or amino acid derivatives, such as lauroyl lysine, alone or in combination with aluminum hydroxide; * a fatty acid stearic acid derivative, preferably isopropyl titanium triisostearate, and * Fluorosilanes, preferably perfluorohexylethyltriethoxysilane.

[0109] Those skilled in the art will be able to select the type of surface treatment based on the nature of the formulation and the intended use, especially in the case of cosmetic uses.

[0110] The process according to the invention therefore makes it possible to obtain a water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, the mixture of bismuth oxychloride and boron nitride representing at least 50% by weight relative to the total weight of the composition.

[0111] use According to a final aspect, the present invention relates to the use of the compositions according to the invention in formulations such as inks, paints, plastics, cosmetic formulations and pharmaceuticals.

[0112] Preferentially, the composition according to the invention represents from 0.1 to 20% by weight relative to the total weight of the formulation, such as ink, paint, plastic, cosmetic and pharmaceutical formulations.

[0113] In particular, the present invention is directed to the use of such white compositions as TiO2 replacement components in such cosmetic formulations.

[0114] According to another embodiment, the present invention is directed to the use of a composition according to the present invention in a solvent-based paint or ink.

[0115] The compositions according to the invention can be used in particular in coatings selected from the group of polyurethanes, acrylics or epoxides.

[0116] The compositions according to the invention can also be used in inks selected in particular from the group of epoxy, acrylic, naphtha-solvent, nitrocellulose, alkyd, polyurethane, polyamide, ketone or polyester.

[0117] Advantageously, the composition according to the invention can replace TiO2 with transparency parameters comparable to those of TiO2. [Example]

[0118] Examples of compositions according to the invention:

[0119] Example 1: A composition according to the invention (Reference 1) was prepared according to the following protocol. Reference 1: The composition according to the invention (Reference 1) consists of: bismuth oxychloride and boron nitride in a ratio of 0.13:1, and - zinc oxide, which accounts for less than 15% of the total mass of the composition; L * Measurements of the parameters and opacity were taken and compared to commercially available compositions targeting the same properties, as well as TiO2, which is commonly used in cosmetic compositions to date. Reference 2: W877 Organophilic TiO2: An inorganic pigment comprising titanium oxide rutile coated with aluminum hydroxide, commercially available from Sensient. Reference 3: NOVAWHITE® mica / Zn: An inorganic pigment comprising a mixture of zinc oxide and mica, marketed by The Innovation Company. Reference 4: NOVAWHITE® Zn / Bo: an inorganic pigment marketed by The Innovation Company, comprising a mixture of zinc oxide and bismuth oxychloride, coated with a hydrogenated oil mixture.

[0120] Reference 5: BN PUHP 1109C: Boron nitride marketed by Saint-Gobain L * Protocol for assessing opacity: 1. Sample Preparation - 20% by weight of the pigment to be tested is dispersed in 80% by weight of MARASTAR SR 910 E21 resin - Homogenize the sample by manually stirring using a spatula for 5 minutes. -The resulting dispersion is passed through an EXAKT 50i 3-roll mill, 1-1 gap. - Apply the film to the BYK contrast chart using a BYK Byko Drive XL automatic applicator and bar 50 Allow the sample to air dry at room temperature for 30 minutes. -Check using a micrometer (Palmer) that the dry thickness is 35 + / - 5 μm 2. For the following samples, * and C are measured. -L * The parameters are determined by measuring with an Xrite CI62 colorimeter on white and black backgrounds. - Opacity C is determined by measuring with an Xrite CI62 colorimeter on a white and black background

[0121] [Table 1]

[0122] Reference 1 according to the present invention is closest to that of Reference 2, which represents the titanium dioxide commonly used in the field of cosmetic compositions. * and opacity properties. * The L and opacity values ​​are also much closer to those of titanium dioxide than those of References 3, 4, and 5, which have been proposed as alternatives to titanium dioxide. * and bismuth oxychloride with an opacity of 85%, and 90 L * and boron nitride, which has an opacity of 86%, the composition of Reference 1 according to the invention has an opacity of L * The synergistic effect of the combination of these two compounds on clarity and opacity values ​​is demonstrated.

[0123] Example 2: Cosmetic Formulation: A cosmetic foundation formulation containing the aforementioned Reference 1 (a composition according to the present invention) was prepared according to the ingredients in the table below.

[0124] [Table 2]

[0125] The cosmetic formulation provides good coverage and hold, is non-sticky, and feels good to the touch.

[0126] Example 3: Comparative test of transparency and opacity measured on a black background of compositions based on the content of a mixture of bismuth oxychloride and boron nitride. In this example, the following five compositions were used: Composition 1 (outside the scope of the present invention) containing a mixture of bismuth oxychloride and boron nitride, which accounts for 17% of the weight of the composition; composition 2 (outside the scope of the present invention) containing a mixture of bismuth oxychloride and boron nitride, representing 10% by weight of the composition; composition 3 (outside the scope of the invention) containing a mixture of bismuth oxychloride and boron nitride, representing 45% of the weight of the composition; Composition 4 (outside the scope of the present invention) containing a mixture of bismuth oxychloride and boron nitride, which represents 30% of the weight of the composition, and Composition 5 (invention) comprising a mixture of bismuth oxychloride and boron nitride, which accounts for 80% of the weight of the composition.

[0127] The characteristics of the above compositions are listed in Table 3 below.

[0128] [Table 3]

[0129] For these five compositions, L * Measurements were made of transparency and opacity measured on a black background defined by parameters, and the results are set out in Table 4 below.

[0130] [Table 4]

[0131] These results show that in order to obtain satisfactory colorimetric parameters similar to those of TiO2, it is necessary for the composition according to the invention to have a mixture of bismuth oxychloride and boron nitride that accounts for at least 50% by weight of the composition.

[0132] Example 4: Examples of compositions according to the present invention In this example, the following three compositions were used: Composition 6 (invention), comprising a mixture of bismuth oxychloride, boron nitride and zinc sulfide, the mixture of bismuth oxychloride and boron nitride being 97% by weight relative to the total weight of the composition; Composition 7 (invention), comprising a mixture of bismuth oxychloride, boron nitride and barium sulfate, the mixture of bismuth oxychloride and boron nitride being 95% by weight relative to the total weight of the composition; Composition 8 (the present invention) comprising a mixture of bismuth oxychloride, boron nitride and calcium carbonate, wherein the mixture of bismuth oxychloride and boron nitride is 95% by weight relative to the total weight of the composition.

[0133] The characteristics of the above compositions are set out in Table 5 below.

[0134] [Table 5]

[0135] For these three compositions, L * Measurements were made of transparency and opacity measured on a black background defined by parameters, and the results are set out in Table 6 below.

[0136] [Table 6]

Claims

1. 1. A water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride, and at least one other inorganic compound, wherein the mixture of bismuth oxychloride and boron nitride is at least 50% by weight based on the total weight of the composition.

2. The composition has an L of greater than 88 * 10. The composition of claim 1, characterized in that it has a transparency defined by a parameter, an opacity of greater than 82%.

3. 3. The composition of claim 1 or 2, wherein the at least one other inorganic compound is selected from iron oxide, zinc oxide, cerium oxide, calcium carbonate, tricalcium phosphate, calcium sulfate, zinc stearate, magnesium carbonate, zinc sulfate, magnesium stearate, barium sulfate, zinc sulfide, aluminum powder, calcined clay, tricalcium phosphate, kaolin, and combinations thereof.

4. 4. The composition of claim 3, wherein the at least one other inorganic compound is selected from zinc stearate, zinc sulfate, zinc oxide, zinc sulfide, and combinations thereof.

5. The composition according to any one of claims 1 to 4, characterized in that the composition has an oil absorption of less than 55%.

6. 6. The composition according to claim 1, which exhibits a transparency and / or opacity higher than that of each of the compounds that make up the composition.

7. The composition has an L of 92 or greater * A composition according to any one of claims 1 to 6, characterized in that it has a transparency defined by parameters and an opacity of 91% or more.

8. The composition according to any one of claims 1 to 7, characterized in that the composition also comprises a coating.

9. Use of the composition according to any one of claims 1 to 8 in ink, paint, plastic and cosmetic formulations, said composition representing 0.1% to 20% by weight relative to the total weight of the formulation.

10. A method for producing a composition according to any one of claims 1 to 8, comprising the following steps: a) selecting the compounds constituting the composition, bismuth oxychloride, boron nitride, and at least one other inorganic compound; b) mixing the compounds selected in step a) by sequential addition; and c) recovering the water-insoluble white composition comprising a mixture of bismuth oxychloride, boron nitride, and at least one other inorganic compound, wherein the mixture of bismuth oxychloride and boron nitride is at least 50 wt. % based on the total weight of the composition.

11. 13. The method for preparing the composition according to claim 12, characterized in that the mixing in step b) is carried out by mechanical dispersion using a powder mixer at a speed of 1 to 20 rpm for a period of 1 to 10 hours.

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