Cosmetic masks for improving the appearance of the skin

Abstract

A face mask cosmetic composition is disclosed, comprising: i) 10-35 wt. % clay; and ii) 0.001-5 wt. % skin benefit agent; and iii) 0.1-5 wt. % titanium dioxide particles having a primary particle size of 50-1000 nm and treated with at least one of a hydrophilic or a hydrophobic agent; wherein the composition also comprises 0.05-5 wt. % silicone resin and a solvent for the resin in an amount sufficient to solubilize the resin, the resin being an MQ silicone resin, a T silicone resin, or a mixture thereof; and the solvent for the silicone resin is at least one of a volatile ester, a volatile hydrocarbon, a volatile alcohol, or a volatile silicone.

Description

[Technical Field]

[0001] The present invention relates to cosmetic compositions for improving the appearance of skin.

[0002] The present invention relates to a cosmetic composition, in particular to a cosmetic composition for application to the face and neck, more particularly, the composition is a face mask, in particular a clay-based rinse-off mask. [Background technology]

[0003] Traditionally, cosmetic compositions described as masks are intended to provide skin care, generally deep cleansing of the epidermis, and are therefore formulated to be applied to the skin in the form of a thick layer. After the application time required to achieve this, generally 10 to 45 minutes, this layer is then removed by rinsing with water or, alternatively, by using a damp cloth or tissue.

[0004] Our skin is susceptible to deterioration due to environmental factors, such as skin damage and strong sunlight, as well as the normal aging process (chronoaging), which can be accelerated by exposure to sunlight (photoaging). In recent years, the demand for cosmetic compositions and methods for improving the appearance of skin has grown significantly. Consumers are increasingly seeking cosmetic compositions for treating, delaying, or concealing the visible signs of chronoaging and photoaging skin, such as wrinkles, fine lines, sagging skin, hyperpigmentation, and age spots.

[0005] WO2020109481A1 (Unilever) discloses a clay mask composition containing bentonite, oil, water, kaolin, and a thickener. The composition does not contain surfactants and does not leave a dry feeling after use.

[0006] WO19016493A1 (Cosmetic Warriors Ltd.) discloses a cosmetic preparation comprising a moisturizing agent; 25 to 80% water; 15 to 50% inorganic materials such as mica, zeolite, calamine and mixtures thereof; and a gelling agent. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. WO2020109481 Brochure [Patent Document 2] International Publication No. WO19016493 Pamphlet Summary of the Invention [Problem to be solved by the invention]

[0008] The inventors have surprisingly found that cosmetic compositions according to the present invention provide a lasting improvement in the appearance of skin, particularly facial skin. [Means for solving the problem]

[0009] According to a first aspect, a face mask cosmetic composition is disclosed comprising: i) 10 to 35 wt. % clay; and ii) 0.001 to 5% by weight of a skin benefit agent, and iii) 0.1 to 5 wt. % titanium dioxide particles having a primary particle size of 50 to 1000 nm and treated with a hydrophilic or hydrophobic agent; wherein the composition comprises 0.05 to 5 weight percent of a silicone resin and a solvent for the resin in an amount sufficient to solubilize the resin, the resin being an MQ silicone resin, a T silicone resin, or a mixture thereof; and The solvent for the silicone resin is at least one of a volatile ester, a volatile hydrocarbon, a volatile alcohol, or a volatile silicone.

[0010] According to a second aspect, there is disclosed the use of the cosmetic composition of the first aspect for long-lasting skin brightening.

[0011] According to a third aspect, there is disclosed a method for providing long-lasting skin brightening comprising applying to the skin the cosmetic composition of the first aspect. DETAILED DESCRIPTION OF THE INVENTION

[0012] As used herein, "skin" is meant to include the skin of the face, neck, scalp, lower arms, chest, back, arms, hands, legs, scalp, feet, buttocks and abdomen, preferably the hands, neck, face and lower arms.

[0013] Superficial imperfections of the skin refer to and include age spots (age spots, spots), pores, fine lines and wrinkles, and grooves (the terms "fine lines," "wrinkles," and grooves are used interchangeably herein.) As used herein, "age spots" refers to any hyperpigmentation (including, for example, solar lentigines), spots, and / or freckles.

[0014] The term "treatment or treatment" as used herein includes within its scope the reduction, delay and / or prevention of the above-mentioned skin conditions, and generally enhancing the quality of the skin and improving its appearance and texture.

[0015] As used herein, "cosmetic composition" is meant to include compositions for topical application to mammalian, particularly human, skin. Such compositions can generally be classified as leave-on, but are preferably rinsed off.

[0016] Except in the examples or where otherwise expressly indicated, all numbers herein indicating quantities of ingredients or reaction conditions, physical properties and / or uses of ingredients may be understood to be optionally modified by the term "about." All amounts are by weight of the final composition unless otherwise specified. As used herein, the term "solid" means that the material is not flowable at 25°C. It should be noted that when specifying any range of values, a given upper limit can be associated with any lower limit. For the avoidance of doubt, the term "comprises" is intended to mean "including," but not necessarily "consisting of" or "consisting of." In other words, the listed steps or options need not be exhaustive. The disclosure of the invention found herein should be considered to encompass all embodiments found in the claims as multiple dependents of each other, notwithstanding the fact that the claims may be found without multiple dependency or redundancy.

[0017] Where features are disclosed with respect to particular embodiments of the invention (e.g., compositions of the invention), such disclosure should be considered to apply mutatis mutandis to all other embodiments of the invention (e.g., methods of the invention).

[0018] As used herein, mask refers to a paste-like substance with a viscosity of 90,000 to 500,000 mPa·s (cp) (determined using RVT-F at 5 RPM, 1 minute, and 25°C). The unit of viscosity used throughout this specification, cps, can be read in SI units as mPa·s (millipascal-second).

[0019] Clay The composition of the present invention preferably contains 10 to 20% by weight of clay.

[0020] "Clay" refers to a natural substance composed primarily of fine-grained minerals, which are generally plastic at the appropriate moisture content. Clays usually contain phyllosilicates, but may contain other substances that impart plasticity and harden when dried or calcined. Examples include kaolin, bentonite, mite, vermiculite, smectite, and chlorite.

[0021] Reference may be made to Kirk-Othmer, Encyclopaedia of Chemical Technology, Volume 5, page 544, 2nd edition, John Wiley and Sons, Inc., New York, New York 1964. The clay may be of natural or synthetic origin. In one embodiment, the clay is preferably hydrophilic. Alternatively, the clay is hydrophobic. Other examples of preferred clays include saponite, hectorite, montmorillonite, bentonite, laponite, fuller's earth, montmorillonite, attapulgite, palygorskite, etc.

[0022] Preferably, the clay is kaolin, bentonite or a combination of kaolin and bentonite.

[0023] The composition of the present invention preferably contains 4 to 18 wt. %, more preferably 6 to 16 wt. % kaolin. In such cases, it is clear that the composition of the present invention contains at least one or more clays so as to satisfy the minimum amount of 10 wt. Kaolin (or kaolinite) refers to a colloidal clay mineral having a chemical composition containing Al2Si2C5(OH)4. Such minerals are suitable for adhering to the oil-water interface of clay masks. The kaolin is preferably a colloidal particle with a median particle size of 1 to 5 μm.

[0024] The compositions of the present invention preferably contain 4 to 12 wt. % bentonite, more preferably 4 to 8 wt. % bentonite. In such cases, it is clear that the compositions of the present invention contain at least one clay to meet the 10 wt. % minimum amount. Bentonite suitable for use in the compositions of the present invention is commercially available from suppliers such as H&H Clay, Inc., Wyoming Bentonite, Brenntag Specialties, Inc., and Sigma-Aldrich.

[0025] Preferably, when the clay is a combination of kaolin and bentonite, the weight ratio of bentonite to kaolin in the composition is 1:0.25 to 1:5 parts by weight, more preferably 1:2 to 1:3 parts by weight.

[0026] Silicone resin The cosmetic composition of the present invention contains 0.05 to 5% by weight of a silicone resin.

[0027] The resin is suitable for use in cosmetic compositions and should be a film-forming silicone resin, typically described by the following siloxy monomer unit: [ka] The R group can be selected from saturated or unsaturated hydrocarbon groups. Preferably, the silicone resin is selected from siloxysilicate, silsesquioxane, or a mixture thereof. More preferably, the silicone resin comprises M units, Q units, T units, or a combination thereof. Even more preferably, the silicone resin comprises MQ silicone resin, T silicone resin, or a mixture thereof.

[0028] In some embodiments, the silicone resin preferably has the formula [(R1)3-Si-O 1 / 2 ] a -(Si-O 4 / 2 ) bwherein R1 are the same or different and are selected from saturated hydrocarbon groups. R1 are preferably selected from C1-C6 alkyl, and more preferably each R1 is a methyl group. Thus, a more preferred MQ silicone resin is trimethylsiloxysilicate. Preferably, a and b independently have values ​​ranging from 10 to 1000, more preferably from 30 to 200.

[0029] In another embodiment, the silicone resin preferably has the formula [R2-Si-O], where R2 is selected from saturated hydrocarbon groups. 3 / 2 ] x The silicone resins include the T silicone resins of the formula (I). R2 is preferably selected from C1-C6 alkyl, more preferably methyl, ethyl, propyl, butyl, and most preferably propyl. The most preferred T silicone resin is polypropylsilsesquioxane. Preferably, x is less than 2000, more preferably less than 500, and preferably greater than 10, more preferably greater than 50.

[0030] The silicone resin preferably comprises a blend of MQ silicone resin and T silicone resin, and the weight ratio of the MQ silicone resin to the T silicone resin is preferably 1:20 to 20:1 to achieve better film-forming performance, more preferably the weight ratio of the MQ silicone resin to the T silicone resin is 1:10 to 10:1, even more preferably 1:5 to 5:1.

[0031] In the most preferred embodiment, the composition comprises an MQ silicone resin. Preferably, the MQ silicone resin is present in an amount of at least 20% by weight of the total silicone resin, more preferably at least 40% by weight, even more preferably at least 70% by weight, and even more preferably at least 85% by weight. Most preferably, the MQ silicone resin is present in an amount of 100% by weight of the total silicone resin.

[0032] Examples of silicone resins suitable for the present invention include Dow Corning™ MQ-1640 flake resin (a mixture of MQ and T-propyl resins), Dow Corning™ MQ-1600 solid resin (100% active MQ resin), and Dow Corning™ 670 fluid (cyclopentasiloxane and) polypropylsilsesquioxane).

[0033] The compositions of the present invention preferably contain 0.1 to 3 weight percent of a silicone resin. References to weight percent are based on solids. Preferably, the silicone resin is selected from trimethylsiloxysilicate, polypropylsilylsesquioxane, or a combination thereof. More preferably, the silicone resin is a mixture of trimethylsiloxysilicate and polypropylsilsesquioxane.

[0034] solvent The solvent for the silicone resin is preferably at least one of a volatile ester, a volatile hydrocarbon, a volatile alcohol, or a volatile silicone.

[0035] When the solvent is a volatile ester, it is preferably at least one of isopropyl myristate, isopropyl palmitate, dicaprylyl carbonate, capric / caprylic triglyceride, or C12-15 alkyl benzoate.

[0036] When the solvent is a hydrocarbon, it is preferably at least one of C11-13 isoparaffin, isodecane, C13-15 alkane, isohexadecane.

[0037] When the solvent is an alcohol, it is preferably ethanol.

[0038] If the solvent is a silicone, it is preferably at least one of cyclopentasiloxane (e.g., XIAMETER PMX-0245), a dimethylpolysiloxane of viscosity 1-10 cSt (e.g., XIAMETER PMX-200 silicone fluid), a polyphenylmethylsiloxane (e.g., DOWSIL™ 556 cosmetic grade fluid), or a volatile alkylmethylsiloxane such as caprylyl branched trisiloxane (e.g., DOWSIL™ FZ-3196 fluid).

[0039] The solvent is present in an amount sufficient to solubilize the resin and in an amount proportional to the corresponding amount of resin. Some commercially available silicone resins (e.g., Dow Corning™ 670 Fluid) already contain solvent.

[0040] Preferably the solvent is a silicone, especially cyclopentasiloxane.

[0041] Titanium dioxide The composition of the present invention contains 0.1 to 5% by weight of titanium dioxide particles having a primary particle size of 50 to 1000 nm and treated with at least one of a hydrophilic or hydrophobic agent, more preferably the titanium dioxide particles are treated with a hydrophilic and a hydrophobic agent.

[0042] More preferably, the hydrophilic agent is aluminum oxide, aluminum hydroxide, or aluminum silicate, and the hydrophobic agent is aluminum stearate, stearic acid, aluminum laurate, zinc stearate, isostearic acid, lauroyl lysine, or dimethicone. Particle size can be measured by the Mac-View particle size distribution (electron microscope) method.

[0043] Preferably, the particle size is 50-250 nm and the particles are treated with stearic acid and / or aluminum hydroxide. An example of such an ingredient is MT-700Z (having a particle size of 80 nm, manufactured by Tayca Corporation).

[0044] Alternatively, and preferably, the titanium oxide particles having a primary particle size of 50 to 1000 nm may be selected from the group consisting of: [Table 1]

[0045] Skin Benefit Agents Preferably, the skin benefit agent provides at least one of radiance, even tone, skin clarity or radiance to the skin.

[0046] Preferably the composition comprises 0.1 to 3% by weight of a skin benefit agent, and that weight percent range applies to all and any benefit agents.

[0047] Preferably, the skin benefit agent is at least one of retinol, retinyl esters, resorcinol, niacin, nicotinic acid, niacinamide, allantoin, ubiquinone, conjugated linoleic acid, 12-hydroxystearic acid, or a 4-alkylresorcinol.

[0048] The term "retinol" includes the following isomers of retinol: all-trans-retinol, 13-cis-retinol, 11-cis-retinol, 9-cis-retinol, and 3,4-didehydro-retinol. Preferred isomers are all-trans-retinol, 13-cis-retinol, 3,4-didehydro-retinol, and 9-cis-retinol. Most preferred is all-trans-retinol due to its widespread commercial availability.

[0049] Retinyl esters are esters of retinol. Retinyl esters suitable for use in the present invention are C1-C30 esters of retinol, preferably C2-C20 esters, and most preferably C2, C3, and C16 esters, because they are more commonly available. Non-limiting examples of retinyl esters include retinyl palmitate, retinyl formate, retinyl acetate, retinyl propionate, retinyl butyrate, retinyl valerate, retinyl isovalerate, retinyl hexanoate, retinyl heptanoate, retinyl octanoate, retinyl nonanoate, retinyl decanoate, retinyl undecanoate, retinyl laurate, and retinyl tridecanoate. , retinyl myristate, retinyl pentadecanoate, retinyl heptadecanoate, retinyl stearate, retinyl isostearate, retinyl nonadecanoate, retinyl arachidonate, retinyl behenate, retinyl linoleate, retinyl oleate, retinyl lactate, retinyl glycolate, retinyl hydroxycaprylate, retinyl hydroxylaurate, and retinyl tartrate. Preferred esters for use in the present invention are selected from retinyl palmitate, retinyl acetate, and retinyl propionate, as they are not only effective but also the most commercially available and therefore the least expensive.

[0050] Resorcinol and its derivatives have a wide variety of uses, including in cosmetics. Resorcinol has been reported to have antioxidant, sun protection, anti-acne, antiseptic, and other therapeutic properties. In particular, 4-alkylresorcinols have been reported to have skin-beautifying and skin-brightening effects. Particularly preferred resorcinols for use in the present invention are 4-substituted resorcinols. The most preferred 4-substituted resorcinols are 4-alkylresorcinols, including 4-ethylresorcinol, 4-hexylresorcinol, 4-butylresorcinol, and 4-phenethylresorcinol.

[0051] Vitamin B3 compounds are known to be long-lasting skin brightening agents. They have also been reported to have various other beneficial properties for the skin. Vitamin B3 compounds or their derivatives include niacin, nicotinic acid, and niacinamide, with niacinamide being the most preferred.

[0052] Conjugated linoleic acid (CLA) is known for its effective treatment and prevention of normal skin conditions, such as wrinkles, fine lines, sagging skin, hyperpigmentation, and age spots, due to aging or exposure to light and sunlight. Conjugated linoleic acid includes a group of positional and geometric isomers of linoleic acid, which allow for various configurations of the cis and trans double bonds at the (6,8), (7,9), (8,10), (9,11), (10,12), or (11,13) positions. Each positional isomer can have four geometric isomers. For example, the (6,8) isomer can exist as cis-6-cis-8, cis-6-trans-8, trans-6-cis-8, and trans-6-trans-8 geometric isomers. Similarly, the remaining five positional isomers can exist as four geometric isomers. Therefore, 24 different isomers of CLA are possible. CLA is distinct from "linoleic acid." Linoleic acid is a straight-chain fatty acid chemically known as cis-9,cis-12-octadecadienoic acid. In linoleic acid, the two double bonds are not conjugated.

[0053] Ubiquinone, also known as coenzyme Q10, is a 1,4-benzoquinone, where Q refers to the quinone chemical group and 10 refers to the number of isoprenyl chemical subunits in its tail. It inhibits both the initiation and propagation of lipid and protein oxidation. It also regenerates other antioxidants, such as vitamin E. In cosmetics, ubiquinone is used as an antioxidant.

[0054] Allantoin is also called 5-ureidohydantoin or glyoxyldiureide. It is the diureide of glyoxylic acid. It is often found in lipsticks, cosmetic lotions, and creams and is used as an antioxidant to prevent the oxidation of uric acid during purine catabolism.

[0055] 12-hydroxystearic acid (commonly referred to as "12-HSA") has been reported to have a wide variety of beneficial cosmetic effects on the skin, including as a PPAR-α (peroxisome proliferator-activated receptor subtype α) activator, a skin brightening agent, and a sebum secretion inhibitor. 12-HSA has also traditionally been used as a gelling agent, for example, in lipstick and antiperspirant compositions. 12-HSA has also been used to increase the viscosity of cosmetic compositions.

[0056] The viscosity of the cosmetic composition is preferably 90,000 to 500,000 cps (measured using RVT-F at 5 RPM, 1 minute, and 25°C). More preferably, the viscosity is 100,000 to 300,000 cps, and even more preferably, 100,000 to 200,000 cps, including all ranges subsumed therein.

[0057] It is particularly preferred that the cosmetic composition of the present invention is a cosmetic face mask.

[0058] In one embodiment, a face mask is used by direct application to the face. Alternatively, the face mask is preferably a product comprising a water-insoluble porous substrate, the substrate being impregnated with the composition of the present invention. In such a case, the water-insoluble porous substrate is preferably selected from paper, polymer web, fabric, or a composite / mixture thereof. The porous substrate is preferably paper or fabric. The porous substrate is preferably configured as separate sheets, a bundle of such sheets, and preferably packaged together as a bundle for sale to consumers. The area of ​​each such sheet is preferably 100 to 1000 cm. 2 , preferably 300 to 500 cm 2, more preferably 350 to 450 cm 2 In a further preferred embodiment, the porous substrate is configured in a shape that is convenient for application to an individual's face having openings for the nose, mouth, and eyes.

[0059] More preferably, the cosmetic composition of the present invention comprises a scrubbing agent, exfoliant, or abrasive. Preferably, this agent is not a plastic or microplastic. Preferably, the agent is walnut shell particles, sugar, salt, seeds, pumice, oats, or other cosmetically acceptable ingredients used for such purposes.

[0060] Nonvolatile polyalkylsiloxanes useful herein include, for example, polydimethylsiloxane.

[0061] When the cosmetic compositions of the present invention include an organopolysiloxane crosspolymer, the polymer is preferably a dimethicone / vinyl dimethicone crosspolymer or dimethicone crosspolymer available from a variety of suppliers, including Dow Corning (9040, 9041, 9045, 9506, and 9509), General Electric (SFE 839), Shin-Etsu (KSG-15, 16, and 18 [dimethicone / phenyl vinyl dimethicone crosspolymer]), and Grant Industries (Gransil brand materials), as well as lauryl dimethicone / vinyl dimethicone crosspolymers supplied by Shin-Etsu (e.g., KSG-31, KSG-32, KSG-41, KSG-42, KSG-43, and KSG-44).

[0062] If the composition includes a non-silicone emollient, the emollient is preferably stearyl alcohol, glyceryl monoricinoleate, mink oil, cetyl alcohol, isopropyl isostearate, stearic acid, isobutyl palmitate, isocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecane-2-ol, isocetyl alcohol, eicosanyl alcohol, behenyl alcohol, cetyl palmitate, di-n-butyl sebacate, isopropyl myristate, isocetyl palmitate, The preferred oleic acid, propyl stearate, isopropyl stearate, butyl stearate, polyethylene glycol, triethylene glycol, lanolin, cocoa butter, corn oil, cottonseed oil, olive oil, palm seed oil, rapeseed oil, safflower oil, evening primrose oil, soybean oil, sunflower seed oil, avocado oil, sesame oil, coconut oil, peanut oil, castor oil, acetylated lanolin alcohol, petrolatum, mineral oil, butyl myristate, isostearic acid, palmitic acid, isopropyl linoleate, lauryl lactate, myristyl lactate, decyl oleate, myristyl myristate, and mixtures thereof.

[0063] Among the ester emollients are alkenyl or alkyl esters of fatty acids having 10 to 20 carbon atoms. Examples of these include isoarachidyl neopentanoate, isodecyl neopentanoate, isononyl isonanoate, cetyl ricinoleate, oleyl myristate, oleyl stearate, and oleyl oleate; ether-esters such as fatty acid esters of ethoxylated fatty alcohols; polyhydric alcohol esters, including butylene glycol or ethylene glycol mono- and di-fatty acid esters, diethylene glycol mono- and di-fatty acid esters, polyethylene glycol (200-6000) mono- and di-fatty acid esters, propylene glycol mono- and Di-fatty acid esters, polypropylene glycol 2000 monooleate, polypropylene glycol 2000 monostearate, ethoxylated propylene glycol monostearate, glyceryl mono- and di-fatty acid esters, polyglycerol poly-fatty acid esters, ethoxylated glyceryl monostearate, 1,3-butylene glycol monostearate, 1,3-butylene glycol distearate, polyoxyethylene polyol fatty acid esters, sorbitan fatty acid esters, and polyoxyethylene sorbitan fatty acid esters are satisfactory polyhydric alcohol esters. Particularly useful are pentaerythritol, trimethylolpropane, and neopentyl glycol esters of C1-C30 alcohols. Typical examples include pentaerythrityl tetraethylhexanoate; wax esters such as beeswax, spermaceti, and tribehenin wax; sterol esters, e.g., cholesterol fatty acid esters; sugar esters of fatty acids such as polysucrose behenate and polysucrose cottonseed; or mixtures of two or more of the foregoing.

[0064] Suitable emollient hydrocarbons include petrolatum, mineral oil, C11-C13 isoparaffins, polyalphaolefins, isohexadecane, or mixtures thereof.

[0065] Preferably, the cosmetic composition of the present invention comprises 20 to 80% by weight of water, more preferably 40 to 75% of water, which water forms part of the carrier.

[0066] Humectants include those of the polyhydric alcohol type. Typical polyhydric alcohols include polyalkylene glycols, more preferably propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol and derivatives thereof, alkylene polyols and derivatives thereof, including sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1,3-butylene glycol, isoprene glycol, 1,2,6-hexanetriol, glycerol, ethoxylated glycerol, propoxylated glycerol and mixtures thereof. The amount of humectant may range, for example, from 0.5 to 50% by weight of the composition, more preferably from 1 to 15%. Most preferred is glycerol (also known as glycerin). The amount of glycerin may range, for example, from 0.5 to 50% by weight, more preferably from 1 to 35% by weight, and optimally from 2 to 15% by weight.

[0067] Various thickening agents can be included in the composition, including, but not limited to, stearic acid, acrylamide / sodium acryloyldimethyltaurate copolymer (Aristoflex AVC), hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer, aluminum starch octenylsuccinate, polyacrylates (such as carbomers, including Carbopol® 980, Carbopol® 1342, Pemulen® TR-2, and Ultrez® thickener), polysaccharides (including xanthan gum, guar gum, pectin, carrageenan, and sclerotium gum), celluloses (including carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, and methylhydroxymethylcellulose), minerals (including talc, silica, alumina, mica, and clays, the latter typified by bentonite, hectorite, and attapulgite), magnesium aluminum silicate, and mixtures thereof. The amount of thickener may range, for example, from 0.05 to 10% by weight of the composition, more preferably from 0.3 to 5% by weight.

[0068] Powders include chalk, talc, starch, gum, carboxyvinyl polymer, sodium carboxymethylcellulose and ethylene glycol monostearate.

[0069] Preferably, the composition contains an additional pigment other than titanium dioxide particles having a primary particle size of 50 to 1000 nm. The pigment is typically a particle of a high refractive index material. For example, the pigment may have a refractive index greater than 1.3, more preferably greater than 1.8, and most preferably 2.0 to 2.7. Examples of such pigments include bismuth oxychloride, barium sulfate, mica, silica, titanium dioxide, zirconium oxide, aluminum oxide, zinc oxide, or a combination thereof. More preferred pigments are particles containing titanium dioxide, zinc oxide, zirconium oxide, mica, iron oxide, or a combination thereof. Even more preferred pigments are particles containing zinc oxide, zirconium oxide, titanium dioxide, or a combination thereof, as these materials have particularly high refractive indices. Even more preferred pigments are selected from titanium dioxide, zinc oxide, or a mixture thereof, with titanium dioxide being the most preferred whitening pigment.

[0070] Preferably, the composition contains 0.001 to 10% by weight of the pigment, more preferably 0.01 to 6% by weight, even more preferably 0.1 to 3% by weight, and most preferably 0.2 to 2% by weight of the pigment.

[0071] The cosmetic compositions of the present invention may further include other ingredients common in the art to enhance physical properties and performance.

[0072] Optional ingredients suitable for use in the compositions of the present invention include extracts of chamomile, green tea, licorice, grape seed, sage, aloe vera, thyme, rosemary, etc., and mixtures thereof. Other ingredients include humectants such as glycerin and / or sorbitol, vitamins such as vitamin C and dihydroxyacetone, and sunscreens such as benzophenone-4 and phenylbenzimidazole sulfonic acid, vitamins A (and their oil-soluble derivatives), D, E (and their oil-soluble derivatives), and K, methoxycinnamate, octyl methoxycinnamate, bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, or mixtures thereof.

[0073] When present, such ingredients may be present in amounts ranging from 0.01 to 10% by weight.

[0074] Traditional preservatives suitable for use in the present invention are alkyl esters of parahydroxybenzoic acid. Other preservatives include hydantoin derivatives, propionates, and various quaternary ammonium compounds. Chemists involved in the development of cosmetic products are familiar with appropriate preservatives and routinely select preservatives that pass preservative challenge tests and provide product stability. Particularly preferred preservatives are iodopropynyl butylcarbamate, phenoxyethanol, 1,2-octanediol, hydroxyacetophenone, ethylhexylglycerin, hexylene glycol, methylparaben, propylparaben, imidazolidinyl urea, sodium dehydroacetate, and benzyl alcohol. Preservatives should be selected taking into consideration the use of the composition and possible incompatibilities between the preservative and other ingredients in the composition. Preservatives are preferably used in amounts ranging from 0.01% to 2.5% by weight of the total composition, including all ranges encompassed therein. Combinations of 1,2-octanediol and phenoxyethanol, or iodopropynyl butylcarbamate and phenoxyethanol, are preferred, with phenoxyethanol and 1,2-octanediol collectively preferably comprising less than 2% by weight of the total weight of the compositions of the present invention. Preservative systems comprising hydroxyacetophenone alone or in mixtures with other preservatives are also preferred.

[0075] It is within the scope of the present invention to use suitable antioxidants in cosmetic compositions to stabilize certain oils and benefit agents. Illustrative examples of antioxidants suitable for use in the present invention include Tinogard DA, Tinogard TT (commercially available from BASF), butylated hydroxytoluene, propyl gallate, and mixtures thereof with tert-butylhydroquinone. When used, the antioxidants will comprise about 0.001 to 1.0 wt. % of the total weight of the composition.

[0076] The compositions of the present invention are preferably prepared by mixing the ingredients under moderate shear (typically with a propeller blade) under atmospheric conditions and at ambient temperature. Heating is optional if solid ingredients are present. Mixing is preferably stopped after obtaining a uniform composition, which is homogenized using a Silverson Homogenizer until a clay mask composition having a viscosity of 90,000 to 500,000 cps is recovered. If heating is desired, the temperature of the composition is raised from ambient to 35 to 50°C (including all ranges subsumed therein).

[0077] Packaging for the compositions of the present invention can be in a jar or tube, or any other design typically found in cosmetic, cream, cleanser, and lotion-type products. The compositions can be applied topically, preferably at 1 to 4 milligrams of composition per square centimeter of skin.

[0078] Uses and Methods According to a second aspect, use of a cosmetic composition for long-lasting skin brightening is disclosed. Preferably, a thin film of the composition is applied as a face mask, left on the face for 10 to 45 minutes, and then rinsed off with water. Preferably, the skin brightening effect is still perceptible 4 to 20 hours after application. More preferably, the degree of skin brightening 4 to 20 hours after application is within 80 to 100% of the effect immediately after cleansing the face. More preferably, the degree of skin brightening is measured using a digital non-contact color measurement tool as described herein.

[0079] To assess color stability, color change (ΔE) was measured in the Hunter Lab color space L * , a * and b * where L * is a black-and-white space, and a * is the green-red space, and b * is a blue-yellow space. For example, larger L *A smaller b value means whiter * A higher value means more blue.

[0080] Images of the above aqueous solutions were captured at time zero (i.e., immediately after they were made) and at the end of the storage period (i.e., at the end of 4 weeks). All images were taken using a Hunter lab-scan XE instrument. * , a * and b * The data was converted into L at week 4 and week 0 (initial data). * , a * and b * Using the values ​​of , ΔE was calculated by the following formula: [ka]

[0081] When used as a face mask, the application of the product can be carried out in the same way as any conventional face mask.For example, when an appropriate size portion of the product is taken out of the composition, the portion is then applied to the user's skin.Optionally, the portion can be mixed with a small amount of water and then applied to the user's skin.The applied composition can then be dried and typically left on the skin for up to about 30 minutes.The product is then washed off the skin.This also provides the user with a pleasant, soothing feeling when the product is washed off the skin.

[0082] Thus, the compositions of the present invention preferably provide long-lasting skin brightening, where the degree of skin brightening is measured as described herein using a digital non-contact color measurement tool.

[0083] According to another aspect, a method of providing long-lasting skin brightening is disclosed, comprising applying to the skin the cosmetic composition of the first aspect.

[0084] Preferably, the composition is applied as a face mask and left on the face for 10 to 45 minutes, followed by rinsing with water. More preferably, the skin brightening is still noticeable 4 to 20 hours after application. Even more preferably, the degree of skin brightening 4 to 20 hours after application is within 80 to 100% of the effect immediately after cleansing the face.

[0085] All other aspects of the present invention will become more readily apparent from a consideration of the detailed description of the invention and the examples that follow.

[0086] The following examples are provided to facilitate understanding of the invention and are not intended to limit the scope of the claims. [Example]

[0087] Example 1 The compositions are set forth in Table 1. Composition C was a control and composition 1 was according to the invention. [Table 2]

[0088] ΔE * The values ​​were measured as described below and are summarized in Table 2. ΔE * The value is an index of brightening, which means radiant skin.

[0089] The clay mask was applied to a 50# Plain Bio-skin plate at a dose of 2 mg / cm. 2 It was.

[0090] The composition is allowed to dry for 30 minutes, and then photographs are taken using DigiEye (registered trademark).The L (for lightness), a and b (for opponent color coordinates) of these coated Bio-skin plates are measured using DigiEye Imaging System (Verivide, UK).Then, the plate is washed in a washing machine to simulate the normal steps that people take to wash their face.Then, the plate is dried under airflow, and then photographs are clicked again.The plate is allowed to dry for 20 hours, and then photographs are clicked again.

[0091] Skin color is measured from the image and expressed as CIE L * a * b * The values ​​are expressed as L * represents the brightness (100 = white, 0 = black), and a * represents the green (-ve value) to red (+ve value) axis, and b * represents the axis from blue (-ve value) to yellow (+ve value). The change in brightness and red-green color before and after cream application is shown by L * The calculation was: =L(front)-L(back)·a=a(back)-a(front).

[0092] ΔE * The values ​​were measured as follows: [ka] [Table 3]

[0093] The above data shows that: a) ΔE of Composition 1 30 minutes after application * was 5 points higher than the comparison composition. b) ΔE of Composition 1 immediately after washing the plate * was much higher than the comparative composition. c) 20 hours after washing the plate, ΔE of Composition 1 * remained the same as the value immediately after washing.

[0094] Thus, Composition 1 was much more effective at brightening or brightening the skin than the comparative composition.

Claims

1. 1. A face mask cosmetic composition comprising: i) 10 to 35 wt. % clay; and ii) 0.001 to 5% by weight of a skin benefit agent, and iii) 0.1 to 5 wt. % titanium dioxide particles having a primary particle size of 50 to 1000 nm and treated with at least one hydrophilic or hydrophobic agent; Including, wherein said composition comprises 0.05 to 5 weight percent of a silicone resin and a solvent for said resin in an amount sufficient to solubilize said resin, said resin being an MQ silicone resin, a T silicone resin, or a mixture thereof; The face mask cosmetic composition, wherein the solvent for the silicone resin is at least one of a volatile ester, a volatile hydrocarbon, a volatile alcohol, or a volatile silicone.

2. 2. The cosmetic composition according to claim 1, wherein the titanium dioxide particles have a particle size of 50 to 250 nm.

3. 3. The cosmetic composition according to claim 1, wherein the hydrophilic agent is aluminum oxide, aluminum hydroxide, or aluminum silicate, and the hydrophobic agent is aluminum stearate, aluminum laurate, stearic acid, zinc stearate isostearate, lauroyl lysine, or dimethicone.

4. The cosmetic composition according to any one of claims 1 to 3, wherein the clay is kaolin, bentonite, or a combination of kaolin and bentonite.

5. 5. The cosmetic composition according to claim 4, wherein when the clay is a combination of kaolin and bentonite, the weight ratio of bentonite to kaolin is 1:0.25 to 1:5 parts by weight.

6. The cosmetic composition according to claim 5, wherein said ratio is 1:2 to 1:3 parts by weight.

7. 7. The cosmetic composition of any one of claims 1 to 6, wherein the skin benefit agent provides at least one of lustre, even tone, skin clarity or radiance to the skin.

8. 8. The cosmetic composition of claim 7, wherein the skin benefit agent is at least one of retinol, a retinyl ester, resorcinol, niacin, nicotinic acid, niacinamide, allantoin, ubiquinone, conjugated linoleic acid, 12-hydroxystearic acid, or a 4-alkylresorcinol.

9. 9. The cosmetic composition of claim 8, wherein said skin benefit agent is niacinamide.

10. 10. The cosmetic composition according to any one of claims 1 to 9, wherein the viscosity of the composition is 90,000 to 500,000 mPa·s (cps) (measured using an RVT-F at 5 RPM, 1 minute, and 25°C).

11. 11. The cosmetic composition of any one of claims 1 to 10, wherein the composition provides long-lasting skin brightening, the degree of skin brightening being measured using a digital non-contact color measurement tool.

12. Use of the cosmetic composition according to any one of claims 1 to 11 for long-lasting skin brightening.

13. A method for providing long-lasting skin brightening, comprising applying to the skin a cosmetic composition according to any one of claims 1 to 11.

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