Use of calcined kaolin as a matting agent

Abstract

The present disclosure relates to a cosmetic composition comprising a cosmetically acceptable carrier and at least 2.5% by weight of calcined kaolin, based on the total weight of the composition. The disclosure also relates to a cosmetic method for reducing skin gloss, and to the use of calcined kaolin as a matting agent in the cosmetic composition.

Description

[Technical Field]

[0001] The present invention generally relates to the use of calcined kaolin as a mattifying agent, and particularly to the use of calcined kaolin as a mattifying agent in cosmetic compositions. Accordingly, the present invention relates to cosmetic compositions comprising a cosmetically acceptable carrier and calcined kaolin, and uses of said compositions. In certain embodiments, the cosmetic composition is a liquid cosmetic composition. In certain embodiments, kaolin is substituted for some or all of another mattifying agent in the cosmetic composition. [Background technology]

[0002] Shiny skin is generally associated with a significant secretion of sebum, and although it primarily affects young people, it can also appear in adulthood, particularly as a result of excessive androgen production or external factors such as dirt. Shiny skin can also be associated with sweat resulting from physical activity or weather conditions. Shiny skin can also be caused by a combination of both of these phenomena (sebum and sweat). Achieving a mattifying effect on the skin is highly desirable for users with combination or oily skin, and for cosmetic compositions intended for use in hot and humid climates. The reflection on the skin surface caused by excessive sebum or sweat is considered unattractive. Shiny skin also generally reduces the durability of makeup, and therefore makeup tends to deteriorate during the day. An effective means of quickly reducing unattractive shiny areas is to use fillers that absorb sebum and perspiration. PMMA powder and nylon powder are well known to have a matting effect. However, these matting agents are oil-derived, which reduces their appeal to consumers, and are ecologically damaging. There was a need to find effective, non-synthetic matting agents.

[0003] The applicant has discovered that this need may be met by a composition comprising a cosmetic composition comprising a cosmetically acceptable carrier and at least 2.5% by weight of calcined kaolin, based on the total weight of the composition. The use of natural kaolin in cosmetic compositions has already been disclosed, for example, in EP 07999021 or EP 1106164. However, the applicant has unexpectedly discovered that calcined kaolin has a high matting effect, in contrast to natural kaolin, which does not provide a matting effect. The composition thus obtained makes it possible to improve the matte feeling of the skin for a long time, so that the skin remains matte for a long time. Summary of the Invention

[0004] According to a first aspect of the present invention, there is provided a cosmetic composition comprising a cosmetically acceptable carrier and at least 2.5% by weight of calcined kaolin, based on the total weight of the composition. For example, the cosmetic composition comprises a cosmetically acceptable carrier and at least 3% by weight of calcined kaolin, such as at least 3.5% by weight of calcined kaolin, for example at least 4% by weight of calcined kaolin, based on the total weight of the composition. In certain embodiments of any of the aspects of the invention, the calcined kaolin is flash calcined kaolin. In certain embodiments of any of the aspects of the present invention, the cosmetic composition does not contain a petroleum-derived mattifying agent. In certain embodiments of any of the aspects of the present invention, the cosmetic composition does not contain nanoparticles. In certain embodiments of any of the aspects of the invention, the calcined kaolin is uncoated. In certain embodiments of any of the aspects of the invention, the calcined kaolin is not coated with petroleum-derived components, such as petroleum-derived matting agents, and / or nanoparticles. In certain embodiments of any of the aspects of the present invention, the cosmetic composition does not contain a matting agent different from calcined kaolin. In certain embodiments of any of the aspects of the present invention, the cosmetic composition further comprises a matting agent different from the calcined kaolin. In certain embodiments of any of the aspects of the present invention, the cosmetic composition comprises less than about 0.5% by weight, such as about 0.4% by weight or less, for example about 0.2% by weight or less, of a matting agent different from calcined kaolin. In certain embodiments of any aspect of the invention, the calcined kaolin has an oil absorption capacity of at least 60 mL / 100 g of calcined kaolin, preferably at least 80 mL / 100 g of calcined kaolin. In certain embodiments of any of the aspects of the present invention, the cosmetic composition is a powder cosmetic composition, for example, a pressed powder cosmetic composition. In certain embodiments of any of the aspects of the present invention, the cosmetic composition is a liquid cosmetic composition, such as a gel cosmetic composition or a cream cosmetic composition. In certain embodiments of any of the aspects of the present invention, the cosmetic composition contains 30% or less by weight of calcined kaolin, or between 5% and 20% by weight of calcined kaolin, based on the total weight of the composition. In certain embodiments of any of the aspects of the present invention, the cosmetic composition contains 15% or less by weight of calcined kaolin, or 7% or less by weight of calcined kaolin, based on the total weight of the composition. In certain embodiments of any aspect of the invention, the calcined kaolin has a d in the range of about 0.1 to 4.0 μm, e.g., 0.8 to about 1.8 μm. 50 It has. In certain embodiments of any of the aspects of the present invention, the cosmetic composition is a leave-on cosmetic composition. In a second aspect of the present invention, there is provided a cosmetic composition comprising a cosmetically acceptable carrier and flash-calcined kaolin. In a third aspect of the present invention, there is provided a cosmetic composition comprising a cosmetically acceptable carrier, calcined kaolin, and a matting agent different from the calcined kaolin. In a fourth aspect of the present invention, there is provided a leave-on cosmetic composition comprising a cosmetically acceptable carrier and flash-calcined kaolin. In a fifth aspect of the present invention, there is provided a cosmetic method for reducing skin shine, which comprises applying to the surface of the skin an effective amount of calcined kaolin as described in any of the previous aspects of the present invention. In a sixth aspect of the present invention, there is provided the use of calcined kaolin as a mattifying agent in a cosmetic composition. The present invention offers the advantage of being environmentally friendly, while providing satisfactory mattifying effects, for example, compared to mattifying agents currently used in cosmetic compositions.

[0005] The details, examples, and preferences given with respect to any one or more particular aspects of the invention specified apply equally to all aspects of the invention. Any combination of the embodiments, examples, and preferences described herein, in all possible variations thereof, is encompassed by the invention unless otherwise indicated herein or clearly contradicted by context. The present invention can be illustrated, without being limited, with reference to the following examples and figures. [Brief explanation of the drawings]

[0006] [Figure 1] 1 is a graph showing the immediate and long-term mattifying efficacy of various compositions prepared in Example 1 compared to bare skin. [Figure 2] 1 is a graph showing the percentage of volunteers who experience immediate or long-term mattifying effects with the various compositions prepared in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0007] Cosmetic Composition Disclosed herein is a cosmetic composition comprising a cosmetically acceptable carrier and calcined kaolin. Unexpectedly and advantageously, it has been found that calcined kaolin can be used as a matting agent in cosmetic compositions. That is, calcined kaolin can be used to replace currently used matting agents, such as petroleum-derived matting agents like PMMA and nylon powder, in cosmetic compositions. In particular, it has been found, unexpectedly and advantageously, that calcined kaolin is stable in cosmetic compositions, especially at low pH and in the presence of ionic substances, such as cationic texture improvers. In particular, it has been found, unexpectedly and advantageously, that kaolin can be used in amounts similar to those of currently used matting agents to achieve equivalent or better properties, such as matting effect (including equivalent or better oil absorption, sebum absorption, and water absorption), hiding power, softness, and smoothness. Therefore, the cosmetic composition may be free of petroleum-derived mattifying agents.

[0008] The term "petroleum-derived matting agent" refers to any ingredient known in the cosmetics industry as a matting agent and derived directly or indirectly from petroleum. For example, petroleum-derived matting agents include polyamide (Nylon®) powder and acrylic polymer powder, such as polymethyl methacrylate (i.e., PMMA), ethylene glycol dimethacrylate, allyl polymethacrylate, lauryl methacrylate, and any copolymers or mixtures thereof. The cosmetic composition may also not contain nanoparticles.This is particularly advantageous, as it enhances the eco-friendly performance of the composition.For example, the composition may contain eco-friendly, i.e., mostly eco-friendly components, and does not contain components that are harmful to the environment and / or harmful to human health, such as nanoparticles.

[0009] The term "nanoparticle" means a particle of material with a size between 1 nm and 100 nm. The European Cosmetic Regulation (EC) No 1223 / 2009 / EC defines "nanomaterial" as "an insoluble or biopersistent, intentionally produced material, the external dimension or internal structure of which is on the scale of 1 to 100 nm." The calcined kaolin may, for example, be uncoated, i.e., not subjected to a coating process, e.g., a surface treatment process.

[0010] The calcined kaolin may be free of petroleum-derived components, such as petroleum-derived matting agents, and / or nanoparticles. Additionally or alternatively, the calcined kaolin may be free of biohazardous components, such as those selected from the following: inorganic biohazardous components, such as TiO and ZnO, or organic biohazardous components, such as alkylsilanes, fluorosilanes, polysiloxanes, and isopropyl titanium triisostearate. The cosmetic composition may, for example, not include a matting agent different from calcined kaolin. Alternatively, the cosmetic composition may further comprise a mattifying agent different from the calcined kaolin. The term "mattifying agent" refers to any ingredient known in the cosmetic industry as a mattifying agent, i.e., any ingredient that can make the skin more "matt" and less shiny. For example, mattifying agents include petroleum-derived mattifying agents, cellulose, and silica. The term "leave-on composition" relates to any composition, excluding exfoliating and cleansing compositions such as shampoos, shower gels, or toothpastes, that is intended to be rinsed off immediately after application. For example, the cosmetic composition may be a makeup composition or a skin care composition. The cosmetic composition may include less than about 0.5% by weight of a matting agent different from calcined kaolin. For example, the cosmetic composition may include no more than about 0.4% by weight of a matting agent different from calcined kaolin, such as no more than about 0.2% by weight of a matting agent different from calcined kaolin.

[0011] Calcined kaolin To produce calcined kaolin, the calcination temperature can be controlled so that the kaolin undergoes a characteristic endothermic dehydration reaction, resulting in full or partial dehydroxylation of the parent mineral (e.g., kaolinite). The calcination temperature may be kept significantly below the temperature at which metakaolin collapses, as indicated by a sudden exotherm in differential thermal analysis (DTA). In contrast, fully calcined kaolin pigments may be calcined at temperatures above this exotherm.

[0012] Kaolin may be dehydroxylated, for example, by calcination, which is a heat treatment process, typically in the presence of air or oxygen. Calcination changes the kaolin structure from crystalline to amorphous. The extent to which the kaolin undergoes a change in crystalline form can depend on the amount of heat applied to the kaolin. Generally, the higher the temperature, the shorter the calcination time. Calcination is typically carried out at a temperature ranging from about 550°C to about 950°C (e.g., from about 750°C to about 950°C, e.g., from about 850°C to about 900°C) to produce calcined kaolin or metakaolin. Further heating to temperatures on the order of about 900-950°C results in densification and the formation of aluminum-silicon spinel (SiAlO 12 At approximately 950°C, the amorphous regions of kaolin (e.g., metakaolin) may begin to recrystallize. Further heating to temperatures around 1050°C and higher may result in further structural changes, producing mullite 3Al2O3 2SiO2 and the highly crystalline cristobalite SiO2.

[0013] The calcination of kaolin can be carried out using, for example, any furnace, kiln, or other suitable heating device. A typical procedure involves heating the kaolin in a kiln, such as a conventional rotary kiln. Typically, the kaolin can be introduced into the kiln as an extrudate from a pug mill. Because the kaolin typically enters the kiln with a starting moisture content of about 25% by weight to facilitate initial kaolin extrusion, the extrudate breaks down into pellets as a result of the calcination process. To prevent the kaolin from completely breaking down into powder form during the calcination process, a small amount of a binder (such as alum) can be added to the kaolin to give it "green strength." The calcination process used may be, for example, a soak-calcination process, i.e., the kaolin or clay is calcined for a period of time during which the chemical properties of the material are gradually changed by the effect of heating. The calcination process may last, for example, at least 1 minute, often at least 10 minutes, for example, from 30 minutes to 5 hours or longer. Known apparatus suitable for carrying out soak-calcination processes include high-temperature ovens, rotary kilns, and shaft kilns.

[0014] The calcination process may be, for example, a flash calcination process in which hydrous kaolin is rapidly heated, typically over a period of less than 1 second, e.g., less than 0.5 seconds. For example, in flash calcination, kaolin (e.g., water-washed kaolin) may be introduced into a hot gas stream for a few seconds. Flash calcination refers to heating a material at an extremely rapid rate, almost instantaneously. Heating rates in flash calciners may be as high as 56,000°C per second, or even higher, e.g., about 100,000°C to about 200,000°C per second. Kaolin may be prepared, for example, by flash calcination, which may expose clay to temperatures above 500°C for 5 seconds or less. Kaolin may be calcined to temperatures ranging from 550°C to 1200°C, for example, with temperatures as high as 1500°C for periods of microseconds. Kaolin can be calcined to a temperature in the range of 800°C to 1100°C, such as a temperature in the range of 900°C to 1050°C, such as a temperature in the range of 950°C to 1000°C. For example, kaolin can be calcined for a time period of less than 5 seconds, such as less than 1 second, such as less than 0.5 seconds, such as less than 0.1 seconds. Flash calcination of kaolin particles results in relatively rapid swelling of the particles caused by relatively rapid dehydroxylation of the kaolin. Water vapor is generated during calcination, which can expand very rapidly, in fact, generally faster than the water vapor can diffuse around the crystalline structure of the particles. As the interlayer hydroxyl groups are displaced, the pressure generated is sufficient to create sealed voids; it is the expanded interlayer spaces, voids, or blisters between the kaolin platelets that are a typical feature of flash-calcined kaolin and give it its distinctive properties.

[0015] The flash calcination process can be carried out by injecting the kaolin into a combustion chamber or furnace that can establish a vortex so that the calcined kaolin can be rapidly removed from the combustion chamber. A suitable furnace would be one that establishes a toroidal fluid flow heating zone, such as the apparatus described in WO 99 / 24360 and corresponding applications US6,334,894 and US6,136,740, the contents of which are incorporated herein by reference in their entirety. Flash calcined kaolin is calcined kaolin obtained by a flash calcination process, such as those described above.

[0016] The kaolin may undergo one or more sizing and / or grinding steps, for example, before or after any optional dehydroxylation. For example, the kaolin may be subjected to grinding by crushing, grinding, or milling. For example, the kaolin may be subjected to sizing using sieves, centrifuges, cyclones, and air classifiers. Sieving can be carried out using a sieve of the desired mesh, for example, a 325 mesh sieve. Other methods include gravity settling or elutriation, any type of hydrocyclone device, or, for example, solid bowl decanter centrifuges and disc nozzle centrifuges. The resulting coarse fraction may be discarded, used as a separate product, or, for example, redirected to a grinding vessel. For example, the kaolin may undergo a densification or concentration step, for example, by gravity thickening, flotation, and / or dewatering.

[0017] For example, calcined kaolin may have a d in the range of about 0.1 μm to about 4.0 μm, such as about 0.4 μm to about 3.0 μm, or about 0.8 μm to about 1.8 μm. 50 For example, the calcined kaolin may have a d in the range of about 0.9 μm to about 1.7 μm, about 0.95 μm to about 1.6 μm, about 1.0 μm to about 1.4 μm, or about 1.1 μm to about 1.3 μm. 50 For example, calcined kaolin may have a d of about 1.2 μm. 50 may have. Calcined kaolin has a d in the range of about 1.0 μm to about 7.0 μm, for example. 90 For example, the calcined kaolin may have a d in the range of about 1.8 μm to about 6.0 μm, about 2.0 μm to about 5.0 μm, about 3.0 μm to about 4.5 μm, or about 3.2 μm to about 4.2 μm. 90 The calcined kaolin may have a d in the range of, for example, about 3.4 μm to about 4.0 μm or about 3.5 μm to about 3.9 μm. 90For example, calcined kaolin may have a d of about 3.7 μm. 90 may have.

[0018] Calcined kaolin has a d in the range of about 0.2 μm to about 1.0 μm, for example. 10 For example, the calcined kaolin may have a d in the range of about 0.3 μm to about 0.9 μm, about 0.35 μm to about 0.85 μm, about 0.4 μm to about 0.8 μm, or about 0.4 μm to about 0.7 μm. 10 Calcined kaolin may have a d in the range of, for example, about 0.4 μm to about 0.6 μm or about 0.45 μm to about 0.55 μm. 10 For example, kaolin may have a d of about 0.5 μm. 10 may have.

[0019] Unless otherwise specified, particle size and other particle size characteristics referred to herein are measured in a well-known manner by sedimentation of fully dispersed granular material in an aqueous medium using a SediGraph III 5120 instrument, herein referred to as the "Micromeritics Sedigraph 5120 unit," as supplied by Micromeritics Corporation, Norcross, Georgia, USA (Tel: +17706623620, Website: www.micromeritics.com) (Standard Method ISO 3317-3). Such an instrument provides measurements and plots of the cumulative mass percent of particles whose size is less than a given "equivalent spherical diameter" (esd), referred to in the industry as the "esd." The mean particle size, or d 50 The value is d 50 The particle ESD value thus determined is the particle ESD value for particles having an equivalent spherical diameter less than the value d. 90 and d 10 are the ratios of particles that are 90% and 10% by mass, respectively. 90 or d 10 The particle ESD value thus determined is the particle ESD value having an equivalent spherical diameter less than the value.

[0020] Calcined kaolin may, for example, have an oil absorption of at least about 60 mL / 100 g. For example, calcined kaolin may have an oil absorption of at least about 80, at least about 90, or at least about 95 mL / 100 g. For example, calcined kaolin may have an oil absorption of about 100 mL / 100 g. Calcined kaolin may, for example, have an oil absorption of up to about 150 mL / 100 g. For example, calcined kaolin may have an oil absorption of up to about 140 mL / 100 g, up to about 130 mL / 100 g, or up to about 120 mL / 100 g. The oil absorption capacity of calcined kaolin is the amount of oil that can be added to 4 g of mineral to produce a thick, smooth paste (tested with linseed). The oil absorption value (mL / 100 g) evaluates the ability of minerals to absorb oil and organic components (standard method ISO 787 / 5).

[0021] Calcined kaolin may, for example, have a water absorption capacity of at least about 60 mL / 100 g. For example, calcined kaolin may have a water absorption capacity of at least about 80, at least about 90, or at least about 95 mL / 100 g. For example, calcined kaolin may have a water absorption capacity of about 100 mL / 100 g. Calcined kaolin may, for example, have a water absorption capacity of up to about 150 mL / 100 g. For example, calcined kaolin may have a water absorption capacity of up to about 140 mL / 100 g, up to about 130 mL / 100 g, or up to about 120 mL / 100 g. The water absorption capacity of calcined kaolin is the volume of water that can be added to 4 g of mineral to produce a thick, smooth paste. The water absorption capacity (mL / 100 g) evaluates the water absorption capacity of minerals (standard method according to ISO 787 / 5).

[0022] Calcined kaolin may, for example, have a sebum absorption of at least about 60 mL / 100 g. For example, calcined kaolin may have a sebum absorption of at least about 80, at least about 90, or at least about 95 mL / 100 g. For example, calcined kaolin may have a sebum absorption of about 100 mL / 100 g. Calcined kaolin may, for example, have a sebum absorption of up to about 150 mL / 100 g. For example, calcined kaolin may have a sebum absorption of up to about 140 mL / 100 g, up to about 130 mL / 100 g, or up to about 120 mL / 100 g. The sebum absorption capacity of calcined kaolin is the volume of synthetic sebum that can be added to 4 g of mineral to obtain a thick, smooth paste. The sebum absorption capacity (mL / 100 g) evaluates the sebum absorption capacity of minerals (standard method according to 787 / 5).

[0023] The synthetic sebum used has the composition shown in Table 1 below. [Table 1]

[0024] The calcined kaolin may have a bulk density of at least about 150 g / l, for example. For example, the calcined kaolin may have a bulk density of at least about 160 g / l, at least about 180 g / l, at least about 200 g / l, at least about 220 g / l, or at least about 230 g / l. For example, the calcined kaolin may have a bulk density of about 240 g / l. The calcined kaolin may have a bulk density of up to about 400 g / l. For example, the calcined kaolin may have a bulk density of up to about 350 g / l, up to about 300 g / l, up to about 290 g / l, up to about 280 g / l, up to about 270 g / l, up to about 260 g / l, or up to about 250 g / l. The bulk density of kaolin is measured by placing the kaolin in a container of known volume and weighing it (standard method EN1097 / 3).

[0025] Calcined kaolin, for example, has a content of at least about 8 m2 For example, calcined kaolin may have a surface area of ​​at least about 9 m / g. 2 / g, at least about 10m 2 / g, or at least about 11m 2 For example, calcined kaolin may have a surface area of ​​about 12 m / g. 2 Calcined kaolin may have a surface area of, for example, about 25 m 2 / g. For example, kaolin has a surface area of ​​about 20 m 2 / g, approximately 19m 2 / g, approximately 18m 2 / g, approximately 17m 2 / g, approximately 16m 2 / g, approximately 15m 2 / g, approximately 14m 2 / g, or approximately 13m 2 / g. The surface area of ​​calcined kaolin can be measured by the BET nitrogen absorption method according to DIN ISO 9277, for example, using a TrisTar instrument available from Micromeritics.

[0026] The calcined kaolin may, for example, have a specific gravity of at least about 2. For example, the calcined kaolin may have a specific gravity of at least about 2.1, at least about 2.2, at least about 2.3, at least about 2.4, at least about 2.5, at least about 2.6, at least about 2.7, or at least about 2.8. For example, the calcined kaolin may have a specific gravity of about 3, or up to about 3.1. The specific gravity of calcined kaolin is measured by calculating the mass of the dry powder divided by its volume, calculated at room temperature using water as the displacing medium. Calcined kaolin may be present in the cosmetic composition in an amount ranging from about 0.1% to about 40% by weight, for example. The cosmetic composition may be, for example, a liquid cosmetic composition, which may be in the form of a gel or lotion-type dispersion, a milk-type emulsion of liquid or semi-liquid consistency, or a cream or gel-type suspension or emulsion of soft semi-solid or solid consistency, obtained by dispersing an oily phase in an aqueous phase (O / W) or vice versa (W / O), or alternatively, a multiple emulsion (W / O / W or O / W / O), a microemulsion, a vesicular dispersion of ionic and / or non-ionic type, or a wax / aqueous phase dispersion.

[0027] When the cosmetic composition is a liquid composition, the calcined kaolin may be present in the cosmetic composition in an amount ranging from about 0.1% to about 15% by weight, from about 0.1% to about 11% by weight, from about 0.1% to about 9% by weight, or from about 0.1% to about 7% by weight. For example, the calcined kaolin may be present in the cosmetic composition in an amount ranging from about 2.5% to about 15% by weight, from about 2.5% to about 11% by weight, from about 2.5% to about 9% by weight, or from about 0.1% to about 7% by weight. For example, the calcined kaolin may be present in the cosmetic composition in an amount ranging from about 3% to about 15% by weight, from about 3% to about 11% by weight, from about 3% to about 9% by weight, from about 3% to about 7% by weight, or from about 3% to about 6% by weight. The cosmetic composition may be, for example, a solid cosmetic composition. The cosmetic composition may be, for example, in the form of a stick, compact, free, pressed, or loose powder.

[0028] When the cosmetic composition is a solid composition, the calcined kaolin may be present in the cosmetic composition in an amount ranging from about 0.1% to about 30% by weight, from about 2.0% to about 25% by weight, from about 5.0% to about 20% by weight, or from about 5.0% to about 15% by weight. For example, the calcined kaolin may be present in the cosmetic composition in an amount ranging from about 2.5% to about 30% by weight, from about 2.5% to about 25% by weight, from about 2.5% to about 20% by weight, or from about 2.5% to about 15% by weight. For example, the calcined kaolin may be present in the cosmetic composition in an amount ranging from about 3% to about 30% by weight, from about 3% to about 25% by weight, from about 3% to about 20% by weight, from about 3% to about 15% by weight, or from about 3% to about 10% by weight. All such compositions are prepared according to conventional methods. Suitable cosmetically acceptable carriers will be known to those skilled in the art and will be selected depending on the intended end use of the cosmetic composition. The cosmetically acceptable carrier may be in a variety of forms, including a solution, colloidal dispersion, oil-in-water emulsion, water-in-oil emulsion, suspension, cream, lotion, gel, powder, foam, mousse, or spray.

[0029] The cosmetic composition may contain one or more standard cosmetic ingredients, such as, for example, hydrophilic or lipophilic gelling and / or thickening agents, anti-settling agents, antioxidants, cosmetic fragrances, preservatives, neutralizing agents, sunscreens, vitamins, moisturizers, texture improvers, self-tanning compounds, anti-wrinkle actives, emollients, hydrophilic or lipophilic active ingredients, agents combating free radicals, sequestrants, colorants, pearlescent agents, film-forming agents, etc. The cosmetic ingredients included in the cosmetic composition can be selected depending on the intended end use of the cosmetic composition. A cosmetic ingredient may also be "cosmetically acceptable" in that it is compatible with application to any keratinous surface (e.g., skin, lips, hair) of a living organism (e.g., human). The cosmetically acceptable carrier and any standard cosmetic ingredients may, for example, comprise up to 99.9% by weight of the cosmetic composition. For example, the cosmetically acceptable carrier and any standard cosmetic ingredients may comprise up to 99% by weight of the cosmetic composition, or up to about 98.5%, up to about 98%, up to about 97.5%, or up to about 97% by weight of the cosmetic composition.

[0030] use Also disclosed herein is the use of calcined kaolin as a matting agent in a cosmetic composition. The cosmetic composition and the calcined kaolin may, for example, be according to any of the embodiments described herein, including any combination thereof. How to reduce shine on skin Also disclosed herein is a method for reducing skin gloss. The method comprises applying to the surface of the skin an effective amount of calcined kaolin according to any of the embodiments described above, including any combination thereof. The method may, for example, be a cosmetic method. [Example]

[0031] The present invention will now be illustrated by some non-limiting examples, in which the percentages are percentages by weight.

[0032] Example 1 Gel cream composition [Table 2] Weigh out the Phase A ingredients and heat until the chlorphenesin melts. Then, sprinkle in Phase B while stirring until a homogenized gel is obtained. Add the Phase C ingredients one by one. Gently heat Phase D until it is completely melted and then add it to the mixture. Finally, ingredient E is added. Compositions containing 5% by weight of Component E in a gel-cream composition were prepared using either flash-calcined kaolin, ImerCare® 04K, cellulose, or PMMA as Component E. A control composition was also prepared without Component E.

[0033] Example 2 Pressed Powder [Table 3]

[0034] The Phase A ingredients are weighed out and mixed manually with a spatula until a homogenized mixture is obtained, then mixed in a mixer for 30 seconds until completely homogenized. Phase B is then added dropwise. The mixture is then homogenized by manual mixing. Phase C ingredients are then added and the mixture is homogenized. The resulting mixture is then mixed again and then sieved. 12 g is weighed into a cup and then compacted at 20 bar for 20 seconds.

[0035] Compositions containing 20% ​​by weight of Component C in a pressed powder composition were prepared using either flash-calcined kaolin, ImerCare® 04K, cellulose, or PMMA as Component C. A control composition was also prepared containing 20% ​​by weight of talc (Luzenac pharmaM, marketed by Imerys) as Component C. result The properties of the minerals described in Examples 1 and 2 were determined as follows.

[0036] D50 was determined using a SediGraph III 5120 instrument (standard method ISO 13317-3), herein referred to as the "Micromeritics Sedigraph 5120 unit", as supplied by Micromeritics Corporation, Norcross, Georgia, USA (Tel: +17706623620, Website: www.micromeritics.com). Oil absorption, synthetic sebum absorption, and water absorption were determined according to standard method ISO 787 / 5 as previously described.

[0037] [Table 4] Calcined kaolin unexpectedly exhibited higher oil absorption, synthetic sebum absorption, and water absorption than natural kaolin. Panel Test To measure the mattifying effect, softness, and hiding power, a sensory analysis was performed by a five-person expert panel according to ISO 13299. The panelists rated the mattifying effect of the four formulas on a scale of 0 to 5.

[0038] Pressed powder test [Table 5]

[0039] Testing on gel cream [Table 6] The proven and surprising properties of calcined kaolin were confirmed by panel tests: a very good mattifying effect combined with excellent softness makes this eco-friendly product ideal for cosmetic applications.

Claims

1. Use of calcined kaolin as a mattifying agent in a cosmetic composition, comprising: The above-mentioned use, wherein the calcined kaolin is flash-calcined kaolin that has been calcined at a temperature in the range of 550°C to 1200°C for a time of less than 5 seconds.

2. The use according to claim 1, wherein the cosmetic composition is free of petroleum-derived mattifying agents.

3. 2. The use according to claim 1, wherein the cosmetic composition comprises less than 0.5% by weight of a matting agent different from flash-calcined kaolin.

4. The cosmetic composition, a cosmetically acceptable carrier; at least 2.5% by weight of flash-calcined kaolin, based on the total weight of the composition; The use according to claim 1, comprising:

5. The use according to claim 1, which does not contain a matting agent different from flash-calcined kaolin.

6. The use described in claim 1, further containing a matting agent different from flash-calcined kaolin.

7. The use of claim 1, wherein the flash-calcined kaolin has an oil absorption capacity of at least 60 mL / 100 g of flash-calcined kaolin.

8. The use described in claim 1, which is a powder cosmetic composition.

9. The use described in claim 8, wherein the powder cosmetic composition is a pressed powder cosmetic composition.

10. The use according to claim 1, which is a liquid cosmetic composition.

11. The use described in claim 10, wherein the liquid cosmetic composition is a gel cosmetic composition or a cream cosmetic composition.

12. The use of claim 10, containing up to 30% by weight of flash-calcined kaolin, or between 5% and 20% by weight of flash-calcined kaolin, based on the total weight of the composition.

13. The use of claim 11, containing not more than 15% by weight of flash-calcined kaolin, or not more than 7% by weight of flash-calcined kaolin, based on the total weight of the composition.

14. The use according to claim 1, wherein the flash calcined kaolin has a d 50 in the range of 0.1 to 4.0 μm.

15. A cosmetic method for reducing skin gloss, comprising applying an effective amount of the flash-calcined kaolin of claim 4 to the surface of the skin.

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