White composition and use thereof in various formulations, in particular cosmetic formulations

Abstract

The present invention relates to a composition which is intended to replace TiO2, the method for producing this composition and the uses thereof. In particular, the present invention relates to a water-insoluble white composition, comprising the 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.% relative to the total weight of the composition. The composition is capable of substituting titanium dioxide and is suitable for various uses, in particular cosmetic uses. The invention also relates to the method for preparing this composition and to the uses thereof.

Description

[0001] WHITE COLOUR COMPOSITION AND ITS USE IN VARIOUS FORMULATIONS, PARTICULARLY COSMETICS

[0002] Technical field

[0003] The present invention relates to the technical field of pigments. The invention relates in particular to a particular white-colored composition capable of replacing titanium dioxide (TiO2), particularly in cosmetics. The invention also relates to its preparation process and its uses.

[0004] Prior art

[0005] Pigments are essential in the composition of certain products to impart color. They are particularly widely used in cosmetic products because they give color and opacity to finished products. In makeup products, pigments are essential because they contribute to the appearance on the skin or nails. Pigments are also present in hair coloring products and skincare products to impart a specific color to the skin.

[0006] Pigments are solid, insoluble molecules. They can be of animal, vegetable, or synthetic origin, and can be inorganic or organic in nature.

[0007] Today, the most widely used pigments in industry are inorganic pigments. Their lightfastness and low cost make them highly sought-after materials. They consist of dry, ground minerals, usually metals or metal salts. Due to their composition, inorganic pigments are generally more opaque and insoluble than organic pigments.

[0008] Among the widely used mineral pigments, TiO2 is particularly noteworthy. It is an inorganic pigment used in powder form in many applications for its incomparable white color and its many other properties such as ultraviolet absorption, opacifying properties, chemical resistance, thermal stability and photocatalyst potential.

[0009] Thanks to its remarkable properties, TiO2 is used in the formulation of a wide variety of finished products such as paints, inks, medicines, toothpastes, construction products (building and public works) and cosmetic product formulations. With the evolution of regulations, more and more studies are focusing on the safety of pigments on humans and the environment. Some recent studies have been able to demonstrate the carcinogenic potential of TiO2 by inhalation.

[0010] In the field of cosmetics, in order to avoid its inhalation, TiO2 is no longer used in the form of powder with small particles in certain formulations such as sprays.

[0011] Although its use in products for topical application is not prohibited, manufacturers, particularly in cosmetics, are always looking for new compounds that can offer an alternative to the ubiquitous use of TiO2 that is suitable for use on the skin and appendages.

[0012] Summary of the invention

[0013] To meet this need, the invention proposes a new composition capable of constituting an alternative to TiO2, particularly suitable for use in cosmetics.

[0014] In particular, the subject of the invention is a white, water-insoluble composition comprising the mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, in which the mixture of bismuth oxychloride and boron nitride represents at least 50% by weight relative to the total weight of the composition.

[0015] Advantageously, the presence of at least 50% bismuth oxychloride and boron nitride within the composition according to the invention allows the composition to have clarity and opacity characteristics similar to those of titanium dioxide.

[0016] Preferably, the composition according to the invention has a clarity defined by an L* parameter greater than 88, an opacity greater than 82%, comprising the mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound.

[0017] Preferably, the composition according to the invention is in powder form.

[0018] It has properties equivalent to those of TiO2, namely clarity defined by an L* parameter greater than 88 and opacity greater than 82%.

[0019] Bismuth oxychloride is a water-insoluble inorganic pigment that can be obtained from copper, tin, or lead. It is used in many areas, including cosmetics in eye shadows, lipstick, and nail polish. Bismuth oxychloride has a clarity L* of 85 and an opacity of 85%. Therefore, the use of bismuth oxychloride alone is insufficient to constitute an alternative to TiO2, particularly in cosmetics. Boron nitride is a white chemical compound used in many areas, particularly in cosmetics. Due to its structural properties, boron nitride can take different conformations, including lamellae and honeycomb. This so-called hexagonal conformation allows it to provide a soft and silky feel, improving the spread of the formulation containing it, particularly on the skin. Boron nitride has a clarity L* of 90 and an opacity of 86%.Thus, the use of boron nitride alone is insufficient to constitute an alternative to TiO2, particularly in cosmetics.

[0020] Advantageously, the combination of the compounds according to the invention makes it possible to generate a synergistic effect on the clarity and / or opacity of the composition which are greater than the clarity and / or opacity of each of the compounds constituting the composition taken individually.

[0021] The composition according to the invention has a clarity allowing it to be suitable for use in particular in cosmetic formulations, medicines, inks and paints as a substitute for TiO2.

[0022] According to a particularly suitable embodiment, the composition according to the invention comprises the mixture of at least 4 inorganic compounds.

[0023] Preferably, the composition according to the invention also comprises, in addition to the mixture of bismuth oxychloride, 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 their combination.

[0024] According to a preferred embodiment of the invention, the composition has an oil uptake of less than 55%.

[0025] Such a composition is particularly useful to provide an alternative to the use of TiO2 in different formulations and applications, particularly in cosmetics.

[0026] According to another aspect, the invention relates to a method for manufacturing a composition according to the invention comprising in particular a step of selecting the compounds constituting the composition according to the invention, a mixture of said constituents and a recovery of the composition according to the invention.

[0027] Finally, the invention also relates to the use of the composition according to the invention in inks, paints, plastics and formulations of cosmetic products. Other characteristics and advantages will emerge from the detailed description of the invention and from the examples which are purely illustrative and in no way limitative of the scope of the invention.

[0028] Detailed description of the invention

[0029] Definitions

[0030] For the purposes of the invention, "lightness" means an indication of the whiteness of the color under study. The darker the color, the lower the lightness. To measure lightness, it is necessary to deposit the composition according to the invention on black background contrast cards, forming a film of uniform thickness. The measurement is obtained using a spectrocolorimeter equipped with an integrating sphere and a D65 illuminant. The closer the parameter L* is to 100, the whiter the composition.

[0031] For the purposes of the invention, "opacity" means the ability of a composition to obscure a covered surface by a given quantity. Opacity is measured by measuring its covering power. Opacity can be measured by calculating the contrast ratio on a white and black background. The composition can be applied using a filmograph at a known thickness. After a drying time, a spectrophotometer measures a reflectance value for the coverage 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, which is expressed as a percentage.

[0032] For the purposes of the invention, "reflectance" means the measurement of the proportion of light reflected on a surface.

[0033] By "oil uptake" within the meaning of the invention, we mean the quantity of linseed oil (in grams) absorbed by 100g of composition according to the invention to obtain a firm and homogeneous paste. More particularly, the measurement of the oil uptake according to the invention consists of kneading the composition according to the invention with the minimum quantity of linseed oil to obtain a plastic mass (powder + oil) which is easily detached from the support (spatula and / or glass plate) on which the kneading is carried out. The higher this value, the more the composition absorbs the oil.

[0034] For the purposes of the invention, the term "film-forming polymer" means a polymer capable of forming, on its own or in the presence of an auxiliary film-forming agent, a continuous and adherent film on a support, in particular on keratin materials.

[0035] For the purposes of the invention, the term "wax" means a fatty substance with reversible liquid / solid phase change, having a melting point above 55°C and generally below 110°C, which is liquid under the conditions of preparation of the formulation according to the invention and which has an anisotropic crystalline organization in the solid state. The wax may be polar or apolar.

[0036] For the purposes of the invention, the term “polar wax” means a wax comprising at least one heteroatom such as oxygen, nitrogen, silicon or phosphorus.

[0037] For the purposes of the invention, the term “apolar wax” means a hydrocarbon wax and / or a silicone wax.

[0038] For the purposes of the invention, the term “filler” means any particle of any shape (in particular spherical or lamellar), mineral or organic, insoluble in the formulation.

[0039] The present invention therefore relates to a white, water-insoluble composition comprising a mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, in which the mixture of bismuth oxychloride and boron nitride represents at least 50% by weight relative to the total weight of the composition.

[0040] According to one embodiment of the invention, the composition according to the invention comprises a mixture of bismuth oxychloride and boron nitride representing at least 55%, preferably at least 60%, even more preferably at least 70%, in particular 75% by weight relative to the total weight of the composition.

[0041] According to another embodiment, the composition according to the invention comprises a mixture of bismuth oxychloride and boron nitride representing between 50 and 95%, in particular 65 and 95%, more preferably between 80 and 95% by weight relative to the total weight of the composition.

[0042] Advantageously, the content of the mixture of bismuth oxychloride and boron nitride is essential to provide clarity and opacity equivalent to that of TiO2.

[0043] According to a particularly preferred embodiment, the composition according to the invention does not comprise TiO2.

[0044] According to another preferred embodiment, the composition according to the invention has a clarity measured on a black background defined by an L* parameter greater than 88 and an opacity greater than 82%.

[0045] Preferably, the composition according to the invention has a clarity measured on a black background defined by an L* parameter greater than 90 and an opacity greater than 82%. The clarity of the composition according to the invention is evaluated by measuring, on a black background, the chromatic coordinate L* from the CIELAB chromatic space, generally called CIE 1976, using an integrating sphere spectrocolorimeter under D65 illumination.

[0046] Preferably, the composition according to the invention has a clarity L* greater than 90, in particular greater than 91, preferably greater than 95.

[0047] Advantageously, the higher the clarity of the composition according to the invention, the whiter the composition.

[0048] The opacity of the composition according to the invention is evaluated by measuring its covering power using a spectrophotometer measuring a reflectance value of the composition applied on a white background (Yw) and on a black background (Yb).

[0049] Preferably, the composition according to the invention has an opacity greater than 85%, in particular greater than 87%, preferably greater than 90%, even more preferably greater than 92%.

[0050] According to a preferred embodiment, the composition according to the invention has a clarity L* greater than 91 and / or an opacity greater than 88%. According to a particularly preferred variant, the composition according to the invention has a clarity L* greater than or equal to 92, and an opacity greater than or equal to 90%.

[0051] Preferably, the composition according to the invention has a greater clarity and / or a greater opacity than that of each of the compounds constituting the composition.

[0052] Advantageously, the selected compounds exhibit a synergistic effect on the L* parameter measured on a dark background and on opacity.

[0053] When the composition is used in inks or paint, the composition according to the invention advantageously retains its characteristics, in particular its clarity and opacity, even after drying. After application, the composition according to the invention can form a dry film retaining its structural organization, in particular its opacity and clarity.

[0054] The composition according to the invention comprises a mixture of at least 3 inorganic compounds, preferably at least 4, even more preferably at least 5.

[0055] Preferably, 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, kaolin and their combination.

[0056] 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 chosen from zinc stearate, zinc sulfate, zinc oxide, zinc sulfide and combinations thereof.

[0057] 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.

[0058] According to another preferred embodiment, the composition according to the invention has an oil uptake of less than 55%, preferably less than 40%, in particular between 25 and 55%, even more preferably between 35 and 45%.

[0059] Advantageously, the oil intake of the composition according to the invention makes it easier to integrate it into cosmetic product formulations.

[0060] According to another embodiment, the composition according to the invention comprises a coating. When the composition according to the invention comprises a coating, the latter is chosen from a hydrophobic coating, a hydrophilic coating, a lipophobic coating or a lipophilic coating.

[0061] The coating, in the context of the invention, is preferably a coating of natural origin.

[0062] Preferably, when the composition according to the invention comprises a coating, the latter comprises at least one molecule chosen from:

[0063] *a silicone derivative preferably chosen from Triethoxycaprylylsilane, Dimethicone and Methicone;

[0064] *a fatty acid ester derivative preferably selected from stearyl glutamic acid, polyhydroxystearic acid, hydrogenated stearyl olive oil ester, magnesium myristate, jojoba esters, lecithin, hydrogenated lecithin, aloe vera oil extract and avocado oil;

[0065] *waxes preferably chosen from carnauba wax, polyethylene wax or olefin type waxes;

[0066] *silane derivatives, preferably chosen from methoxy PEG-10 propyltrimethoxysilane;

[0067] *silica;

[0068] *phytic acid, inositol dihydrogen phosphate ester; *metal salts of fatty acid;

[0069] *metallic alcoholates;

[0070] *polysaccharides;

[0071] *alkyl titanate;

[0072] * natural or mineral oils;

[0073] *amino acids or amino acid derivatives such as lauroyl lysine alone or combined with aluminum hydroxide;

[0074] *a fatty acid stearic acid derivative preferably isopropyl titanium triisostearate; and

[0075] *a fluoro silane, preferably perfluorohexylethyl Triethoxysilane.

[0076] Advantageously, the coating of the composition according to the invention makes it possible to facilitate the dispersion of the composition in cosmetic formulations. A person skilled in the art can choose the type of coating depending on the nature and intended use of the formulation, in particular when it is a cosmetic use.

[0077] Preferably, the composition according to the invention is in powder form.

[0078] The composition according to the invention is thus particularly suitable for replacing TiO2 in cosmetic product formulations.

[0079] According to another aspect, the composition according to the invention is capable of being obtained by a manufacturing process comprising the following steps: a) Selection of each compound constituting the composition according to the invention: bismuth oxychloride, boron nitride and at least one other inorganic compound; b) Mixing of the compounds selected in step a) by successive addition; c) Recovery of a white, water-insoluble composition comprising the mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, in which the mixture of bismuth oxychloride and boron nitride represents at least 50% by weight relative to the total weight of the composition.

[0080] The invention also relates to a formulation comprising the composition according to the invention.

[0081] Preferably, the formulation according to the invention does not comprise titanium dioxide. According to one embodiment, the formulation according to the invention comprises between 0.1 and 20% by weight of composition according to the invention, preferably between 0.5 and 10% and even more preferably between 1 and 8%, relative to the total weight of the formulation.

[0082] Advantageously, the necessary quantity of composition according to the invention to be added to a formulation to replace TiO2 while obtaining clarity and opacity similar to that of the same formulation comprising TiO2 is less than 4 times the quantity of TiO2 present in the formulation, preferably less than 3 times.

[0083] Advantageously, the amount of composition according to the invention to be added to the formulation to obtain a white color and an opacifying power similar to that of TiO2 is less than the amount of coloring matter of the prior art not having the desired colorimetric characteristics. However, occupying a more significant proportion in a cosmetic formulation leads to additional constraints such as surface tension, texture, hardness or even oil uptake. The formulation according to the invention may comprise a cosmetically acceptable medium, that is to say capable of being applied to the skin, lips or eyelashes without generating discomfort for the user.

[0084] The formulation according to the invention may be presented in particular in the form of a mascara formulation, a lipstick or lip gloss formulation, in the form of an eyeshadow and / or blush or even in the form of a foundation formulation or a care product for the face or body.

[0085] Preferably, the formulation according to the invention can be presented in any form suitable for the field of cosmetics, in particular in the form of a powder, an emulsion, a microemulsion, a nanoemulsion, a suspension, a solution, a lotion, a cream, an aqueous or hydroalcoholic gel, a mousse, a serum, a solution or a dispersion for aerosol, or a dispersion of lipid vesicles, or droplets obtained by coacervation or not by microfluidics.

[0086] According to one embodiment, the formulation according to the invention is in the form of an anhydrous formulation, i.e. containing less than 5% by weight of water, preferably less than 1% by weight of water.

[0087] According to another embodiment, the formulation according to the invention is in the form of a water-in-oil or oil-in-water emulsion. The formulation according to the invention may also comprise, in addition to the composition according to the invention, at least one additive chosen from an emollient agent, a humectant, a gelling and / or thickening agent, a film-forming agent, a surfactant, an oil, a non-volatile organic solvent, a filler, a wax, an active agent, a colorant, a preservative, an antioxidant, an organic or inorganic powder, a sunscreen and a perfume.

[0088] When the formulation according to the invention comprises at least one humectant, at least one humectant is chosen from:

[0089] - polyols such as glycerin, diglycerin, propylene glycol, caprylyl glycol, pentylene glycol or hexanediol);

[0090] - sugars;

[0091] - glycosaminoglycans such as hyaluronic acid and its salts and esters; and

[0092] - polyquaterniums such as PMB lipid.

[0093] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one humectant having a content of between 0 and 30%, preferably between 0.005 and 10% by total weight of the formulation.

[0094] When the formulation according to the invention comprises at least one emollient agent, at least one emollient agent is chosen from:

[0095] - esters such as jojoba esters, fatty acid and fatty alcohol esters, preferably chosen from octyldodecyl myristate, triethylhexanoin, Dicaprylyl carbonate and Isostearyl isostearate, caprylic / capric triglyceride;

[0096] - butters such as shea butters, preferably butyrospernum parkii butter extract, shea butter ethyl esters, marketed under the names LIPEX SHEASOFT, LIPEX SHEA-U, LIPEX SHEA, LIPEX SHEALIGHT, LIPEX SHEA TRIS or moringa butters, preferably moringa oil / hydrogenated moringa oil esters);

[0097] - waxes preferably chosen from acacia decurrens flower wax, helianthus annuus cera seed wax, CIO-18 triglycerides;

[0098] - vegetable oils;

[0099] - phytosqualane

[0100] - alkanes preferably chosen from undecane and tridecane. Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one emollient agent having a content of between 0.1 and 30%, preferably between 0.5 and 10% by total weight of the formulation.

[0101] When the formulation according to the invention comprises at least one gelling and / or thickening agent, at least one gelling and / or thickening agent is chosen from:

[0102] - cellulose derivatives preferably chosen from gums of plant origin such as guar, carob, alginates, carrageenans, pectins, gums of microbial origin such as xanthan,

[0103] - clays such as laponite

[0104] - crosslinked or non-crosslinked, hydrophilic or amphiphilic homo- and copolymers

[0105] - acryloylmethylpropane sulfonic acid (AMPS) and / or acrylamide and / or acrylic acid and / or acrylic acid salts or esters (marketed 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).

[0106] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one gelling and / or thickening agent having a content of between 0.1 and 10% by total weight of the formulation.

[0107] When the formulation according to the invention comprises at least one surfactant, at least one surfactant is chosen from:

[0108] - anionic surfactants such as isethionates, taurates, sarcosinates, glycinates, glutamates, phosphates (C20-22 alkyl phosphate marketed under the name SENSANOV WR);

[0109] - amphoteric surfactants such as betaine derivatives, amphoacetates;

[0110] - non-ionic surfactants such as polyglycerol derivatives, sugar derivatives such as glucoside or xyloside derivatives marketed under the name MONTANOV 68, MONTANOV 202, Montanov 82, MONTANOV L, EASYNOV), lecithins.

[0111] 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 between 0.1 and 15%, preferably between 0.5 and 10% by total weight of the formulation.

[0112] When the formulation according to the invention comprises at least one film-forming polymer, at least one film-forming polymer is chosen from: - synthetic polymers such as radical type or polycondensate type polymers,

[0113] - polymers of natural origin and their mixtures, preferably acrylic polymers, polyhydroxyalkanoates (PHA), polyurethanes, polyesters, polyamides, polyureas and cellulosic polymers such as nitrocellulose.

[0114] 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 between 0.5 and 20% by total weight of the formulation.

[0115] Advantageously, the film-forming polymer makes it possible to improve the hold and non-transfer properties of the formulation according to the invention, in particular makeup formulations.

[0116] According to one embodiment of the invention, the formulation comprises, in addition to the composition according to the invention, at least one non-volatile organic oil or solvent chosen from non-volatile hydrocarbon and / or silicone oils.

[0117] When the composition comprises at least one oil or non-volatile organic solvent, it has a content of between 0.01 and 30% by weight, preferably between 0.1 and 25%, in particular between 0.1 and 20% relative to the total weight of the formulation.

[0118] Preferably, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one oil or non-volatile organic solvent having a content between 0.01 and 30% by weight, preferably between 0.1 and 25%, in particular between 0.1 and 20% relative to the total weight of the formulation.

[0119] 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 between 0.5 and 20%, preferably between 1 and 10% by total weight of the formulation.

[0120] When the formulation according to the invention comprises at least one filler, at least one filler is chosen from talc, mica, silica, kaolin, boron nitride, starch, starch modified with octenylsuccinic anhydride, polyamides, silicone resins, silicone elastomer powders and acrylic polymer powders such as polymethyl methacrylate. The fillers used in the formulation according to the invention may in particular consist of several layers of different chemical nature and / or physical form and in particular be in the form of lamellae coated with spherical fillers. They may be modified using different surface treatments. According to one embodiment, the formulation according to the invention comprises, in addition to the composition according to the invention, at least one coloring material chosen from a pigment or a nacre.

[0121] When the formulation according to the invention comprises at least one coloring matter comprising a pigment, the pigment may be white or colored, mineral and / or organic, coated or not.

[0122] Said pigment is preferably chosen from zirconium, zinc or cerium oxides, as well as iron or chromium oxides, manganese violet, ultramarine blue, chromium hydrate and ferric blue, carbon black, D & C type pigments, and lakes based on cochineal carmine, barium, strontium, calcium, aluminum.

[0123] The nacres may preferably be chosen from white nacreous pigments such as mica coated with titanium or bismuth oxychloride, colored nacreous pigments such as titanium mica with iron oxides, titanium mica with in particular ferric blue or chromium oxide, titanium mica with an organic pigment of the aforementioned type as well as nacreous pigments based on bismuth oxychloride.

[0124] Other additives commonly used in cosmetics may also be present in the formulation according to the invention, in particular preservatives, antioxidant agents or perfumes well known in the technical field.

[0125] The person skilled in the art is able to choose, from among all of these possible additives, both the nature and the quantity of those which will be added to the composition, so that the latter retains all of its properties.

[0126] According to another subject, the invention relates to a composition having a clarity defined by an L* parameter greater than 90, an opacity greater than 80%, comprising the mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound.

[0127] Process

[0128] Also, according to another aspect, the invention relates to a method for manufacturing a composition according to the invention comprising at least the implementation of the following steps: a) Selection of each compound constituting the composition according to the invention: bismuth oxychloride, boron nitride and at least one other inorganic compound b) Mixing of the compounds selected in step a) by successive addition; and c) Recovery of a white, water-insoluble composition comprising the mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, in which the mixture of bismuth oxychloride and boron nitride represents at least 50% by weight relative to the total weight of the composition.

[0129] The compounds in step a) are different inorganic compounds:

[0130] - at least bismuth oxychloride and boron nitride; and

[0131] - 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 their combination.

[0132] The mixing of step b) is carried out by convection, diffusion or mechanical dispersion, preferably the mixing of step b) is carried out using a powder mixer.

[0133] Advantageously, the powder mixer makes it possible to mix the composition according to the invention without causing the composition to crush on the walls.

[0134] Preferably, the mixing of step b) is carried out in a powder mixer at a speed of between 1 and 20 rpm, preferably between 1 and 10 rpm, even more preferably at 10 rpm.

[0135] Advantageously, the speed of the mixing in step b) makes it possible to obtain a homogeneous mixture.

[0136] Preferably, the mixing of step b) is carried out for a period of between 1 and 10 hours, preferably 1 to 5 hours, even more preferably 2 hours.

[0137] According to a particularly preferred embodiment, the mixing of step b) is carried out using a powder mixer at a speed of 5 rpm for 2 hours.

[0138] Advantageously, the mixing of step b) makes it possible to obtain a homogeneous composition.

[0139] According to one embodiment, the method according to the invention comprises a step d) of surface treatment. The surface treatment step, also called coating, can be hydrophobic, hydrophilic, lipophobic or lipophilic.

[0140] Step d) of surface treatment can be carried out with:

[0141] *a silicone derivative preferably chosen from Triethoxycaprylylsilane, Dimethicone and

[0142] Methicone; *a fatty acid ester derivative preferably selected from stearyl glutamic acid, polyhydroxystearic acid, hydrogenated stearyl olive oil ester, magnesium myristate, jojoba esters, lecithin, hydrogenated lecithin, aloe vera oil extract and avocado oil; *waxes preferably selected from carnauba wax, polyethylene wax or olefin type waxes;

[0143] *silane derivatives, preferably chosen from methoxy PEG-10 propyltrimethoxysilane;

[0144] *silica;

[0145] *phytic acid, inositol dihydrogen phosphate ester;

[0146] *metallic salts of fatty acids;

[0147] *metallic alcoholates;

[0148] *polysaccharides;

[0149] *alkyl titanate;

[0150] * natural or mineral oils;

[0151] *amino acids or amino acid derivatives such as lauroyl lysine alone or combined with aluminum hydroxide;

[0152] *a fatty acid stearic acid derivative preferably isopropyl titanium triisostearate; and

[0153] *a fluoro silane, preferably perfluorohexylethyl Triethoxysilane.

[0154] A person skilled in the art can choose the type of surface treatment depending on the nature and intended use of the formulation, particularly when it is for cosmetic use.

[0155] Thus, the process according to the invention makes it possible to obtain a white, water-insoluble composition comprising the mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, in which the mixture of bismuth oxychloride and boron nitride represents at least 50% by weight relative to the total weight of the composition.

[0156] Uses

[0157] According to a final aspect, the invention relates to the use of a composition according to the invention in formulations such as inks, paints, plastics, cosmetic product formulations and medicaments. Preferably, the composition according to the invention represents from 0.1 to 20% by weight relative to the total weight of a formulation such as an ink, a paint, a plastic, a cosmetic product formulation and a medicament.

[0158] In particular, the invention relates to the use of such a white-colored composition as a TiO2 substitute in such cosmetic formulations.

[0159] According to another embodiment, the invention relates to the use of the composition according to the invention in solvent-based paints or inks.

[0160] The composition according to the invention can be used in particular in paints chosen from the polyurethane, acrylic or epoxy family.

[0161] The composition according to the invention can also be used in particular in inks chosen from the family of epoxies, acrylics, naphtha solvents, nitrocelluloses, alkyds, polyurethanes, polyamides, ketones or polyesters.

[0162] Advantageously, the composition according to the invention makes it possible to replace TiO2 by presenting a clarity parameter equivalent to that of TiO2.

[0163] Example of composition according to the invention:

[0164] A composition according to the invention (reference 1) was produced according to the following protocol:

[0165] Reference 1: The composition according to the invention (reference 1) consists of:

[0166] - bismuth oxychloride and boron nitride in a ratio of 0.13 / 1; and

[0167] - zinc oxide representing less than 15% of the total mass of the composition.

[0168] Measurements of the L* parameter and opacity were carried out and these measurements were compared to commercial compositions aiming for the same properties as well as to TiO2 commonly used in cosmetic compositions to date:

[0169] Reference 2: Organophilic TiO2 W877: inorganic pigment comprising titanium oxide rutile coated with aluminum hydroxide, marketed by the company Sensient.

[0170] Reference 3: NOVAWHITE® mica / Zn: inorganic pigment comprising a mixture of zinc oxide and mica, marketed by The Innovation Company. Reference 4: NOVAWHITE® Zn / Bo: inorganic pigment comprising a mixture of zinc oxide, bismuth oxychloride, coated with a mixture of hydrogenated oil, marketed by The Innovation Company.

[0171] Reference 5: BN PUHP 1109C: boron nitride marketed by the company Saint-Gobain

[0172] L* and opacity assessment protocol:

[0173] 1. Sample preparation

[0174] - Disperse 20% by mass of the pigment to be tested in 80% by mass of MARASTAR SR 910 E21 resin

[0175] -Homogenize the sample by manual stirring, using a spatula, for 5 minutes

[0176] - Pass the obtained dispersion to the EXAKT 50i three-cylinder, spacing 1-1

[0177] -Deposit the film on BYK contrast card using a BYK Byko Drive XL automatic applicator and an alter 50

[0178] -Let the sample dry for 30 minutes in the open air at RT

[0179] -Check that the dry thickness is 35 + / - 5 pm using a micrometer (palmer)

[0180] 2. Measurement of L* and C on the following samples:

[0181] -The L* parameter is determined by measurement using an Xrite CI62 colorimeter on a white and black background

[0182] -Opacity C is determined by measurement using an Xrite CI62 colorimeter on a white and black background

[0183] [Table 1]

[0184] Reference 1, in accordance with the invention, has the L* and opacity properties closest to those of reference 2, representing titanium dioxide commonly used in the field of cosmetic compositions. It also has L* and opacity values ​​much closer to titanium dioxide than references 3, 4 and 5 proposed as alternatives to titanium dioxide. Finally, compared to bismuth oxychloride, which has an L* of 85 and an opacity of 85%, and to boron nitride, which has an L* of 90 and an opacity of 86%, respectively, the composition of reference 1 according to the invention demonstrates the synergistic effect in the combination of these two compounds on the clarity L* and opacity values. Example 2: Cosmetic formulation:

[0185] A cosmetic foundation formulation comprising reference 1 (composition according to the invention) as described previously was produced according to the elements in the Table below:

[0186] [Table 2]

[0187] The cosmetic formulation has good coverage and hold properties, is non-sticky, and is pleasant to the touch.

[0188] Example 3: Comparative test of the clarity measured on a dark background and the opacity of compositions as a function of the content of the mixture of bismuth oxychloride and boron nitride.

[0189] To create this example, 5 compositions were used, namely:

[0190] • Composition 1 (Outside the invention) comprising a mixture of bismuth oxychloride and boron nitride representing 17% of the weight of the composition; • Composition 2 (Outside the invention) comprising a mixture of bismuth oxychloride and boron nitride representing 10% of the weight of the composition;

[0191] • Composition 3 (Outside the invention) comprising a mixture of bismuth oxychloride and boron nitride representing 45% of the weight of the composition; • Composition 4 (Outside the invention) comprising a mixture of bismuth oxychloride and boron nitride representing 30% of the weight of the composition; and

[0192] • Composition 5 (invention) comprising a mixture of bismuth oxychloride and boron nitride representing 80% of the weight of the composition.

[0193] The characterization of the above-mentioned compositions is described in Table 3 below: [Table 3]

[0194] For these 5 compositions, a measure of the clarity measured on a black background defined by a parameter

[0195] L* and opacity were performed. The results are described in Table 4 below:

[0196] [Table 4] These results demonstrate that it is necessary for the composition according to the invention to have a mixture of bismuth oxychloride and boron nitride representing at least 50% by weight of the composition to obtain satisfactory colorimetric parameters similar to those of TiO2.

[0197] Example 4: Examples of composition according to the invention To produce this example, 3 compositions were used, namely:

[0198] • Composition 6 (invention) comprising the mixture of bismuth oxychloride, boron nitride and zinc sulfide, in which the mixture of bismuth oxychloride and boron nitride represents 97% by weight relative to the total weight of the composition;

[0199] • Composition 7 (invention) comprising the mixture of bismuth oxychloride, boron nitride and barium sulfate, in which the mixture of bismuth oxychloride and boron nitride represents 95% by weight relative to the total weight of the composition;

[0200] • Composition 8 (invention) comprising the mixture of bismuth oxychloride, boron nitride and calcium carbonate, in which the mixture of bismuth oxychloride and boron nitride represents 95% by weight relative to the total weight of the composition; The characterization of the aforementioned compositions is described in Table 5 below:

[0201] [Table 5] For these 3 compositions, a measure of the clarity measured on a black background defined by a parameter

[0202] L* and opacity were performed. The results are described in Table 6 below:

[0203] [Table 6]

Claims

CLAIMS

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

2. Composition according to the preceding claim, characterized in that the composition has a clarity defined by a parameter L* greater than 88, an opacity greater than 82%.

3. Composition according to one of the preceding claims, characterized in that said at least one other inorganic compound is 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.

4. Composition according to the preceding claim, characterized in that the at least one other inorganic compound is chosen from zinc stearate, zinc sulfate, zinc oxide, zinc sulfide and combinations thereof.

5. Composition according to one of the preceding claims, characterized in that the composition has an oil uptake of less than 55%.

6. Composition according to one of the preceding claims, characterized in that it has a clarity and / or an opacity greater than that of each of the compounds constituting the composition.

7. Composition according to one of the preceding claims, characterized in that the composition has a clarity defined by a parameter L* greater than or equal to 92 and an opacity greater than or equal to 91%.

8. Composition according to one of the preceding claims, characterized in that the composition also comprises a coating.

9. Use of a composition according to one of claims 1 to 8 in inks, paints, plastics and product formulations cosmetics, said composition representing from 0.1% to 20% by weight relative to the total weight of the formulation

10. A method of manufacturing a composition according to one of claims 1 to 8, characterized in that it comprises the following steps: a) Selection of each compound constituting the composition: bismuth oxychloride, boron nitride and at least one other inorganic compound, b) Mixing the compounds selected in step a) by successive addition; and c) Recovery of a white, water-insoluble composition comprising the mixture of bismuth oxychloride, boron nitride and at least one other inorganic compound, in which the mixture of bismuth oxychloride and boron nitride represents at least 50% by weight relative to the total weight of the composition.

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

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