Coated particles for cosmetics

Abstract

An object of the present invention is to provide a coated particle for cosmetics having an excellent feeling of use (softness and moist feeling on the skin) and high stability (high hydrophobicity).SOLUTION: Coated particles for cosmetics having a coating layer containing polyisoprene (A) and an ester compound (B) of a saccharide compound in which two or more monosaccharides are bonded and fatty acids having 8 to 28 carbon atoms on at least a part of the surfaces of cellulose particles, wherein the content of the polyisoprene (A) is 0.1% by weight or more and less than 2.0% by weight based on the weight of the cellulose particles, and the BET specific surface area is 0.1 to 60m2 / g.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to coated particles for cosmetics. [Background technology]

[0002] Various powder raw materials (such as petroleum-derived synthetic resin beads such as nylon and silicone, and naturally-derived powder raw materials) are used to give cosmetics a soft feel and a moist feel, as well as to impart other effects (such as cosmetic effects and UV protection), and various improvements are being made to meet market needs. For example, cellulose acetate particles that have been coated with a metal soap-based treatment agent to make them hydrophobic have been studied as a naturally derived powder raw material used to improve the feel of cosmetics (Patent Document 1). Modifying the surface of the powder raw material to make it hydrophobic is believed to result in excellent water repellency and oil moisture absorption properties.

[0003] However, the softness and moist feeling that the coated particles described in Patent Document 1 impart to cosmetics is insufficient, and further improvement in the feel of cosmetics when used has been desired. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-99605 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide coated particles for use in cosmetics that have an excellent feel when used (softness and moistness on the skin) and high hydrophobicity. [Means for solving the problem]

[0006] The present inventors have conducted extensive research to solve these problems and have arrived at the present invention. That is, the present invention provides coated particles for cosmetics, which have a coating layer on at least a part of the surface of cellulose particles, the coating layer containing polyisoprene (A) and an ester compound (B) of a sugar compound formed by bonding two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms, wherein the content of the polyisoprene (A) is 0.1 wt % or more and less than 2.0 wt % based on the weight of the cellulose particles, and the BET specific surface area is 0.1 to 60 m 2 / g of coated particles for cosmetics. [Effects of the Invention]

[0007] According to the present invention, coated particles for cosmetics that are excellent in feel when used (softness and moistness to the skin) and have high hydrophobicity can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be described in detail below. The present invention relates to coated particles for cosmetics, which have a coating layer on at least a portion of the surface of a cellulose particle, the coating layer comprising polyisoprene (A) and an ester compound (B) of a sugar compound formed by the bonding of two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms. In this specification, cosmetics refer to cleansers for hair or skin (such as shampoo, facial cleanser, cream facial cleanser, body soap, solid soap, cleansing oil, and liquid soap), hair care cosmetics (such as hair rinse, conditioner, non-cationic conditioner, treatment, hair oil, and styling agents (such as hair gel and hair spray)), skin care cosmetics (such as skin lotion, lotion, emulsion, cream, hand cream, all-in-one gel, and shaving agent), makeup cosmetics (such as emulsion foundation, solid foundation, makeup base, BB cream, CC cream, powder, lipstick, blush, eyeliner, eye shadow, eyebrow makeup, and mascara), hair cosmetics (such as hair wax, hair gel, hair spray, and hair color), sunscreen cosmetics (such as cream type, gel type, and roll-on type), wipe cosmetics (such as face masks, makeup remover sheets, sweat wipes, and hair wipes), fragrance products, and antiperspirants. The formulation of the cosmetic of the present invention is not particularly limited, and examples thereof include powder, solid, solid powder, stick, liquid (homogeneous liquid, emulsion, etc.), cream, sheet, gel, etc. When the cosmetic is an emulsion cosmetic, it may be in the form of either an oil-in-water emulsion or a water-in-oil emulsion. In this specification, chemical products may be described by their display names or alternative display names listed in the "List of Cosmetics Display Names" compiled by the Japan Cosmetic Industry Association.

[0009] <Cellulose particles> Cellulose particles used in the coated particles for cosmetics of the present invention include crystalline cellulose particles, amorphous cellulose, cellulose ester particles in which some or all of the hydroxyl groups of cellulose have been esterified (cellulose acetate particles, cellulose propionate particles, cellulose butyrate particles, cellulose acetate particles, cellulose sulfate particles, nitrocellulose particles, cellulose phosphate particles, etc.), and cellulose ether particles in which some or all of the hydroxyl groups of cellulose have been etherified (methylcellulose particles, ethylcellulose particles, carboxymethylcellulose particles, etc.).

[0010] The cellulose particles may be hollow, porous, or solid. There is no limitation on the shape of the cellulose particles, and cellulose particles such as spherical particles, rugby ball-shaped particles, columnar particles, plate-shaped particles, short fiber particles, and irregular particles can be used.

[0011] The number-average particle size of the cellulose particles is preferably 0.01 to 100 μm, more preferably 0.1 to 10 μm, and particularly preferably 3 to 10 μm, from the viewpoint of the feel when using a cosmetic containing the coated particles for cosmetics.

[0012] The number-average particle diameter of the cellulose particles can be measured by, for example, subjecting the cellulose particles to sputtering treatment if necessary and then observing them with a transmission electron microscope (trade name: JEM-2100, manufactured by JEOL Ltd.) at an accelerating voltage of 80 kV and an observation magnification of 50,000. The number-average particle diameter of the cellulose particles in the present invention is determined by randomly sampling primary particles from 100 particles in the image, determining their particle diameters (average of the major axis and minor axis), and calculating the number average of these values.

[0013] As the cellulose particles, commercially available cellulose particles may be used. Examples of commercially available cellulose particles include CELLULOBEADS D-5 (registered trademark, cellulose particles having a number-average particle diameter of 5 μm, manufactured by Daito Chemical Industry Co., Ltd.), CELLULOBEADS D-10 (registered trademark, cellulose particles having a number-average particle diameter of 10 μm, manufactured by Daito Chemical Industry Co., Ltd.), CELLULOBEADS USF-X (registered trademark, cellulose particles having a number-average particle diameter of 3 to 5 μm, manufactured by Daito Chemical Industry Co., Ltd.), CELLULOBEADS D-30 (registered trademark, cellulose particles having a number-average particle diameter of 30 μm, manufactured by Daito Chemical Industry Co., Ltd.), SILK COTTON PW (registered trademark, cellulose particles, manufactured by Daito Chemical Industry Co., Ltd.), and SILONS 190 (registered trademark, number-average particle diameter of 9 μm, manufactured by ABC Nanotech).

[0014] The coated particles for cosmetics of the present invention have a coating layer on at least a part of the surface of a cellulose particle. Coating refers to a state in which a layer of another substance is attached to the surface of an object to be coated, and the surface of the object to be coated and the layer of another substance may be physically attached to each other, or may be integrated by forming a chemical bond. The coating layer contains polyisoprene (A) and an ester compound (B) of a sugar compound formed by bonding two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms.

[0015] <Polyisoprene (A)> Polyisoprene (A) is a type of thermoplastic elastomer, and is broadly classified into cis-1,4-polyisoprene (cis polyisoprene) and trans-1,4-polyisoprene (trans polyisoprene) based on its structure.

[0016] Cis-polyisoprene is a biodegradable polymeric material that can be obtained by extraction from natural rubber sap or by chemical synthesis. The weight-average molecular weight of the cis-polyisoprene is preferably 1,000,000 to 4,000,000, more preferably 1,000,000 to 1,500,000. When the weight-average molecular weight of the cis-polyisoprene is within the above range, the resulting cosmetic material particles have a moderate elasticity and can improve the feel of adhesion to the skin.

[0017] Trans-polyisoprene can be obtained by extraction from Eucommia ulmoides, which belongs to the Eucommia family of the Eucommia order, or Palaquim gutta, which belongs to the Sapotaceae family of the Ericales order, or by chemical synthesis. The weight-average molecular weight of the trans-polyisoprene is preferably 100,000 to 3,000,000, more preferably 300,000 to 1,500,000. When the weight-average molecular weight of the trans-polyisoprene is within the above range, the resulting cosmetic material particles have good elasticity and a good feel when used.

[0018] Cis-polyisoprene is the main component of natural latex rubber, obtained from the sap (latex) of rubber trees, and trace amounts of fatty acids and / or proteins (biological defense proteins) may be attached to the ends of the polyisoprene chains. These fatty acids and proteins are thought to be the allergen components that cause latex allergies, and have been reported to produce IgE antibodies primarily through percutaneous sensitization, resulting in symptoms such as contact urticaria at the site of contact, urticaria that spreads throughout the body, anaphylaxis, anaphylactic shock, asthma attacks, conjunctivitis, and rhinitis. In contrast, trans-polyisoprene is a safer substance that does not pose the risk of latex allergies, unlike the cis-polyisoprene. From this perspective, trans-polyisoprene is preferred as the polyisoprene (A). Use of trans-polyisoprene can ensure safety not only for allergy sufferers but also for a wider range of people.

[0019] The content of polyisoprene (A) is 0.1% by weight or more and less than 2.0% by weight based on the weight of the cellulose particles. If the content of polyisoprene (A) is less than 0.1% by weight based on the weight of the cellulose particles, sufficient elasticity for cosmetic material particles cannot be obtained, and if it exceeds 2.0% by weight, the elasticity is too high and the particles do not blend well with the skin. From the viewpoint of the feeling when used as a cosmetic material particle, the content of polyisoprene (A) is preferably 0.3 to 1.9% by weight, more preferably 0.5 to 1.5% by weight, based on the weight of the cellulose particle.

[0020] The content of polyisoprene (A) in the coated particles for cosmetics of the present invention can be calculated from the blending ratio of each raw material when producing the coated particles for cosmetics. If the blending ratio is unknown, an X-ray photoelectron spectrometer (ESCA-5400, manufactured by ULVAC-PHI, Inc.) is used to measure the number of photoelectrons in a binding energy range of 100 to 1500 eV, and the peak area value in the range of 275 to 290 eV attributable to carbon atoms is determined. By referring to the carbon bond quantitative values ​​of each of the disclosed compositions of coated particles for cosmetics, the content of polyisoprene (A) can be calculated from the peak area value.

[0021] <(B) Ester Compounds of Sugar Compounds Composed of Two or More Monosaccharides Linked to Fatty Acids Having 8 to 28 Carbon Atoms> Among the monosaccharides that form a sugar compound by binding two or more monosaccharides, preferred monosaccharides include glucose, fructose, galactose, and fructose. Sugar compounds formed by the binding of two or more monosaccharides include disaccharides, trisaccharides, and tetrasaccharides formed by the above monosaccharides, as well as polysaccharides formed by the binding of five or more monosaccharides. Examples of disaccharides include sucrose, maltose, lactose, cellobiose, trehalose, and lactulose. Examples of trisaccharides include nigerotriose, maltotriose, melezitose, maltotriulose, raffinose, and kestose. Examples of tetrasaccharides include nystose, nigerotetraose, and stachyose. Examples of polysaccharides include dextrin, α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, inulin, starch, cellulose, chitin, and glucomannan. Among sugar compounds formed by the bonding of two or more monosaccharides, from the viewpoint of the stability of the cosmetic preparation, sugar compounds formed by the bonding of two or more glucose and / or fructose are preferred, with sucrose, dextrin, inulin, pullulan, and cellulose being more preferred, and dextrin and inulin being particularly preferred.

[0022] Preferred examples of the fatty acid having 8 to 28 carbon atoms that forms an ester compound with the sugar compound include linear saturated fatty acids having 8 to 28 carbon atoms, branched saturated fatty acids having 8 to 28 carbon atoms, linear unsaturated fatty acids having 8 to 28 carbon atoms, and branched unsaturated fatty acids having 8 to 28 carbon atoms. Examples of the straight-chain saturated fatty acids having 8 to 28 carbon atoms include octanoic acid, dodecanoic acid, tetradecanoic acid (myristic acid), hexadecanoic acid (palmitic acid), octadecanoic acid (stearic acid), eicosanoic acid, and octacosanoic acid. Examples of branched saturated fatty acids having 8 to 28 carbon atoms include 2-ethylhexanoic acid, 11-methyldodecanoic acid, 2-hexyldecanoic acid, 2-octadecanoic acid, and 16-methylheptadecanoic acid. Examples of the straight-chain unsaturated fatty acids having 8 to 28 carbon atoms include 9-hexadecenoic acid, 11-octadecenoic acid, 9,11,13-octadecatrienoic acid, and 5,8,11-eicosatetraenoic acid. Examples of the branched unsaturated fatty acids having 8 to 28 carbon atoms include isomyristoleic acid, isooleic acid, 2-methyl-9-octadecenoic acid, and 2-methyl-2-eicosenoic acid. As the fatty acid having 8 to 28 carbon atoms, from the viewpoint of the stability of the cosmetic preparation, a linear saturated fatty acid having 8 to 28 carbon atoms and a branched saturated fatty acid having 8 to 28 carbon atoms are preferred, and a linear saturated fatty acid having 8 to 22 carbon atoms and a branched saturated fatty acid having 8 to 22 carbon atoms are more preferred.

[0023] Specific examples of the ester compound (B) of a sugar compound formed by bonding two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms include dextrin palmitate, dextrin stearate, dextrin myristate, dextrin laurate, dextrin arachidate, dextrin behenate, dextrin pentadecanoate, dextrin heptadecanoate, (palmitic acid / stearic acid)dextrin, (behenic acid / myristic acid / pentadecanoate)dextrin, (palmitic acid / 2-ethylhexanoate)dextrin, (palmitic acid / isostearate)dextrin, (laurate / oleate)dextrin, (behenate / acetate)dextrin, (palmitate / hexyldecanoate)dextrin, (palmitate / isostearate / 2-ethylhexanoate / oleate / valerate / acetate)dextrin, inulin stearate ester, inulin palmitate ester, inulin laurate ester, (palmitate / 2-hexyldecanoate)dextrin, (palmitate / 2-hexyldecanoate / isostearate)dextrin, etc.

[0024] Among these, from the viewpoint of the feel of the coated particles for cosmetics when used (softness and moistness on the skin), (B) is selected from the group consisting of dextrin palmitate, dextrin stearate, dextrin myristate, dextrin (palmitate / stearate), dextrin (behenate / myristic acid / pentadecanoate), dextrin (palmitate / 2-ethylhexanoate), dextrin (palmitate / hexyldecanoate), dextrin (laurate / oil), and dextrin (behenate / myristic acid / pentadecanoate). Preferred are dextrin (leic acid), dextrin (palmitic acid / hexyldecanoic acid), dextrin (palmitic acid / 2-ethylhexanoic acid), and inulin dextrin stearate, and more preferred are dextrin palmitate, dextrin myristate, dextrin (palmitic acid / hexyldecanoic acid), dextrin (palmitic acid / 2-ethylhexanoic acid), and inulin stearate.

[0025] The content of the ester compound (B) is preferably 0.1 to 10% by weight based on the weight of the cellulose particles. When the content of the ester compound (B) is within the above range, the feel of use (softness and moistness on the skin) of the coated particles for cosmetics is improved. The content of the ester compound (B) is more preferably 0.2 to 5% by weight based on the weight of the cellulose particles.

[0026] The content of the ester compound (B) in the coated particles for cosmetics of the present invention can be calculated from the blending ratio of each raw material when the coated particles for cosmetics are produced. If the blending ratio is unknown, an X-ray photoelectron spectrometer (ESCA-5400, manufactured by ULVAC-PHI, Inc.) is used to measure the number of photoelectrons in a binding energy range of 100 to 1500 eV, and the peak area value in the range of 275 to 290 eV attributable to carbon atoms is determined. The content of the ester compound (B) can be calculated from the peak area value by referring to the carbon bond quantitative values ​​of each of the disclosed compositions of coated particles for cosmetics.

[0027] <Coated particles for cosmetics> The BET specific surface area of ​​the coated particles for cosmetics of the present invention is 0.1 to 60 m 2 / g. The BET specific surface area of ​​the coated particles for cosmetics is 0.1 m 2 If the viscosity is less than 60m / g, the feeling of use (softness to the skin) of the coated particles for cosmetics will be deteriorated. 2 If the particle size exceeds 1 / g, the oil absorption of the particles becomes too high, reducing the degree of freedom in designing cosmetic formulations. From the viewpoint of the feeling of use of coated particles for cosmetics, the BET specific surface area of ​​the coated particles for cosmetics is 0.2 to 60 m 2 / g, and 0.5 to 40m 2 / g is more preferred.

[0028] The BET specific surface area of ​​the coated particles for cosmetics is determined by a carrier gas method using nitrogen gas as an adsorbate in accordance with JIS Z 8830:2013, using a fully automatic BET specific surface area measuring device "Macsorb HM model-1201" (manufactured by Mountec Co., Ltd.).

[0029] <Method of manufacturing coated particles for cosmetics> The coated particles for cosmetics of the present invention can be produced by mixing cellulose particles, polyisoprene (A), and an ester compound (B) of a sugar compound formed by the bonding of two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms. Examples of the production method include a dry method in which coating treatment is performed without using a solvent, and a wet method in which cellulose particles are coated with polyisoprene (A) dispersed or dissolved in a solvent and the ester compound (B). From the viewpoint of environmental considerations and the degree of freedom in the concentration and type of coating agent, the production of the coated particles for cosmetics of the present invention is preferably carried out by a dry method.

[0030] Examples of methods for producing coated particles for cosmetics using a dry method include a method in which cellulose particles, polyisoprene (A) and the ester compound (B) are mixed without using a solvent using a stirrer (a mill mixer, pencil mixer, planetary mixer, disperser mixer, homomixer, intensive mixer, ribbon blender, jet mill, ball mill, kneader, extruder, mortar, grinder, etc.), a grinder, a mixer, and a disperser, thereby coating the cellulose particles with polyisoprene (A) and the ester compound (B). The order of mixing is not particularly limited, and the cellulose particles, polyisoprene (A), and the ester compound (B) may be added and mixed simultaneously, or the cellulose particles, polyisoprene (A), and the ester compound (B) may be added and mixed in that order. Among these, from the viewpoint of improving the surface hydrophobicity of the coated particles for cosmetics, it is preferable to add and mix the cellulose particles, polyisoprene (A), and the ester compound (B) in that order. In the dry method, the coating treatment may be carried out while applying energy such as heat, ultraviolet light, laser, or electromagnetic waves.

[0031] The mixing time in the dry method may be adjusted depending on the machine used and the processing amount, and mixing is preferably carried out until the surfaces of the cosmetic-coated particles exhibit water repellency. Specifically, it is preferable that the "degree of surface hydrophobicity (%) of the coated particles" measured by the following method is 90% or more. 0.1 g of coated particles was placed in a 30 mL beaker containing 24.9 g of purified water and stirred for 30 minutes using a magnetic stirrer. Using a syringe (5 cc capacity), 1-2 cc of the coated particles dispersed in the purified water, avoiding particles on the surface of the water, was collected together with the purified water used as the dispersion medium, forming a coated particle dispersion. The weight of the collected coated particle dispersion and the total amount of the collected coated particle dispersion were then dried in a forward-air dryer at 105°C for 1 hour, after which the dry weights were measured. The measured weights were substituted into the following formula to determine the "degree (%) of surface hydrophobicity of the coated particles." Degree of surface hydrophobicity of coated particles (%) = [1 - {(25 × dry weight of coated particle dispersion collected with syringe (g)) / (amount of coated particle dispersion collected with syringe (g)) / 0.1}] × 100 The mixing temperature in the dry method is preferably 0°C to 50°C.

[0032] Examples of the wet method for producing coated particles for cosmetics include a method in which cellulose particles are mixed with polyisoprene (A) and the ester compound (B) dissolved or dispersed in a solvent (water and / or an organic solvent), thereby coating the cellulose particles with polyisoprene (A) and the ester compound (B). The solvent used in the wet method is preferably an ester oil, a hydrocarbon oil, a fatty acid oil, an aliphatic alcohol oil, or a silicone oil. Since the above-mentioned solvents are also used as components of cosmetics, when they are used as solvents in the wet method, there is little risk of skin irritation even if the solvent remains on the coated particles for cosmetics. The ester oil can be any ester oil known as a cosmetic raw material, such as the liquid oils and synthetic ester oils described in JP 2020-26432 A. Triesters of caprylic acid and capric acid with glycerin, diesters of caprylic acid and capric acid with propanediol, and monoesters of lauric acid and 1-hexanol are preferably used. As the hydrocarbon oil, hydrocarbon oils known as raw materials for cosmetics can be used, such as those described in JP 2020-26432 A, and squalane can be preferably used. As the fatty acid oil, fatty acid oils known as raw materials for cosmetics can be used, and saturated fatty acids having 9 or less carbon atoms can be preferably used. As the fatty alcohol oil, fatty alcohol oils known as raw materials for cosmetics can be used, and saturated fatty alcohols having 11 or less carbon atoms can be preferably used. As the silicone oil, a silicone oil known as a cosmetic raw material can be used, such as the silicone oil described in JP 2020-26432 A.

[0033] The amount of solvent in the wet method for producing coated particles for cosmetics is preferably 40% by weight or more relative to the weight of the cellulose particles. The total weight ratio of the polyisoprene (A) and the ester compound (B) to the solvent is preferably 0.1 to 20% by weight, more preferably 1 to 5% by weight. The weight ratio of the treatment liquid in which polyisoprene (A) and the ester compound (B) are dissolved or dispersed in a solvent to the cellulose particles is preferably 30:70 to 99:1. The apparatus used in the wet method is not particularly limited as long as it is capable of stirring and heating.

[0034] In the wet method, it is preferable to have a step of removing the solvent. Methods for removing the solvent include a method in which the mixture of cellulose particles, polyisoprene (A), and the ester compound (B) with the solvent is heated and / or reduced pressure to vaporize and distill off the solvent, and a method in which the solvent is extracted and removed from the mixture.

[0035] The amount of solvent remaining in the coated particles for cosmetics obtained by the wet method is preferably 20% by weight or less, and more preferably 5% by weight or less, based on the weight of the coated particles for cosmetics. The weight of the solvent remaining in the cosmetic-coated particles can be obtained by mixing the cosmetic-coated particles with the same weight of methanol or hexane as the cosmetic-coated particles at 25°C for 30 minutes, filtering off the solid portion, and calculating the ratio of the evaporation residue of the filtrate to the dry weight of the solid portion.

[0036] The cosmetic of the present invention is characterized by containing the coated particles for cosmetics of the present invention. The blending amount of the coated particles for cosmetics of the present invention in the cosmetic of the present invention is appropriately selected from 1 to 99% by weight of the total cosmetic, preferably 1 to 10% by weight, and more preferably 1 to 6% by weight. The coated particles for cosmetics of the present invention can be applied to various cosmetics, but are particularly preferred in cosmetics applied to the skin, such as skin care cosmetics, makeup cosmetics, antiperspirant cosmetics, and UV protection cosmetics, and cosmetics applied to the hair, such as hair cosmetics. Examples of skin care cosmetics include lotions, emulsions, creams, cleansers, packs, oil liquids, massage products, beauty serums, beauty oils, detergents, deodorants, hand creams, lip balms, and wrinkle concealers. Examples of makeup cosmetics include makeup bases, concealers, face powders, powder foundations, liquid foundations, eye color, eye shadow, mascara, eyeliner, eyebrow pencils, and lipsticks. Examples of antiperspirant cosmetics include roll-on, cream, solution, and stick-type antiperspirant cosmetics. Examples of UV protection cosmetics include sunscreen oils, sunscreen emulsions, and sunscreen creams. Examples of hair cosmetics include shampoos, rinses, treatments, and setting agents.

[0037] The cosmetic preparation of the present invention may be in any form, for example, a powder, an oily liquid, a water-in-oil emulsion, an oil-in-water emulsion, a non-aqueous emulsion, or a multiple emulsion such as a W / O / W type or an O / W / O type. The cosmetic preparation of the present invention may be in a variety of forms, including liquid, emulsion, cream, solid, paste, gel, powder, pressed, multi-layered, mousse, spray, stick, pencil, etc.

[0038] The cosmetic of the present invention may contain an oily agent. Examples of oils include organopolysiloxanes such as dimethylpolysiloxane (dimethicone), methylhydrogenpolysiloxane, methyltrimethicone, methylphenylpolysiloxane, and dimethylsiloxane-methylphenylsiloxane copolymer; cyclic siloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, tetramethyltetrahydrogencyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetratrifluoropropylcyclotetrasiloxane, pentamethylpentatrifluoropropylcyclopentasiloxane, and diphenylsiloxyphenyltrimethicone; and silicone oils such as modified organopolysiloxanes such as polyether-modified dimethylpolysiloxane, oleyl-modified dimethylpolysiloxane, polyvinylpyrrolidone-modified dimethylpolysiloxane, and alkyl-modified dimethylpolysiloxane.Glyceryl Tri-2-Ethylhexanoate, Isotridecyl Isononanoate, Isononyl Isononanoate, Cetyl 2-Ethylhexanoate, Isopropyl Myristate, Isopropyl Palmitate, 2-Ethylhexyl Palmitate, Octyldodecyl Myristate, Glyceryl Trioctanoate, Caprylic / Capric Triglyceride, Glyceryl Diisostearate, Glyceryl Triisostearate, Decaglyceryl Decaisostearate (Polyglyceryl-10 Decaisostearate), Propylene Glycol Dicaprate, Neopentyl Dicaprate Glycol, Polyglyceryl Triisostearate, Diisostearyl Malate, Neopentyl Glycol Diethylhexanoate, Polyglyceryl-2 Isostearate, Polyglyceryl-10 Decaisostearate, Pentaerythrityl Tetraisostearate, Pentaerythrityl Tetra-2-ethylhexanoate (Pentaerythrityl Tetraethylhexanoate), Dipentaerythrityl Pentaisostearate, Dipentaerythrityl Hexa(hydroxystearate / stearic acid / rosin acid), Dialkyl Carbonate, Tridecyl Trimellitate, Cyclopentasiloxane Ester oils such as bisethoxydiglycol dihexane-1,4-dicarboxylate, dimer dilinoleyl hydrogenated rosin condensate, hydrogenated castor oil monostearate, cetyl palmitate, polyethylene glycol distearate, glyceryl tribehenate, 2-ethylhexyl paramethoxycinnamate, and ethylhexyl salicylate; isododecane, isohexadecane, light isoparaffin, liquid paraffin, squalane, squalene, α-olefin oligomer, polybutene, liquid isoparaffin, heavy liquid isoparaffin, polyisobutylene, and hydrogenated polyisobutene. hydrocarbon oils such as oleic acid, isostearic acid, myristic acid, palmitic acid, isopalmitic acid, lauric acid, stearic acid, behenic acid, polyhydroxystearic acid, etc.; higher alcohols such as oleyl alcohol, 2-octyldodecanol, 2-decyltetradecanol, isostearyl alcohol, 2-hexyldecanol, etc.; fluorinated oils such as perfluoropolyether, perfluorodecane, and perfluorooctane; liquid oils such as fragrances; paste-like oils such as cocoa butter, shea butter, castor oil, hydrogenated castor oil, hydrogenated coconut oil, and petrolatum;Examples of solid oils include paraffin wax, ceresin wax, microcrystalline wax, polyethylene wax, polypropylene wax, Fischer-Tropsch wax, (ethylene / propylene) copolymer, cholesterol, phytosterol, stearyl-modified polysiloxane, hydrogenated oil, petrolatum, palm oil, etc.;

[0039] The cosmetic of the present invention may contain inorganic powder. Examples of the inorganic powder include sericite, natural mica, calcined mica, synthetic mica, synthetic sericite, alumina, mica, talc, kaolin, bentonite, smectite, calcium carbonate, magnesium carbonate, magnesium silicate, aluminum silicate, calcium phosphate, silicic acid anhydride, magnesium oxide, barium sulfate, magnesium aluminometasilicate, iron oxide, chromium oxide, titanium oxide, zinc oxide, cerium oxide, aluminum oxide, magnesium oxide, Prussian blue, ultramarine, calcium carbonate, magnesium carbonate, calcium phosphate, aluminum hydroxide, magnesium sulfate, silicic acid, magnesium aluminum silicate, calcium silicate, barium silicate, strontium silicate, silicon carbide, metal tungstate, magnesium aluminate, magnesium aluminometasilicate, aluminum chlorohydrate, clay, zeolite, hydroxyapatite, ceramic powder, aluminum nitride, silicone carbide, titanium dioxide ... Examples of suitable pigments include baltic, lithium cobalt titanate, cobalt aluminate, inorganic blue pigments, low-order titanium dioxide, fine particle titanium dioxide, butterfly-shaped barium sulfate, petal-shaped zinc oxide, hexagonal plate-shaped zinc oxide, tetrapod-shaped zinc oxide, fine particle zinc oxide, titanium dioxide-coated mica, titanium dioxide-coated mica, titanium dioxide-coated silica, titanium dioxide-coated synthetic mica, titanium dioxide-coated talc, fish scale foil, titanium dioxide-coated colored mica, titanium dioxide-coated borosilicate (sodium / calcium), titanium dioxide-coated borosilicate (calcium / aluminum), red iron oxide-coated mica, red iron oxide-coated mica titanium, red iron oxide- and black iron oxide-coated mica titanium, carmine-coated mica titanium, carmine-ferric ferrous iron oxide-coated mica titanium, mango violet, cobalt violet, glass fiber, alumina fiber, disteardimonium hectorite, stearalkonium hectorite, quaternium-18 bentonite, quaternium-18 hectorite, and benzalkonium bentonite.

[0040] The inorganic powder may be surface-treated, for example, with a fatty acid (including a metal soap), a fluorine compound, a pendant, a silane coupling agent, a silicone, a titanium coupling agent, an oil, an N-acylated lysine, a polyacrylic acid, an amino acid, an inorganic compound, a plasma, or a mechanochemical treatment. The silicone treatment is, for example, treating the surface of the inorganic powder with a silicone treatment agent, such as dimethylpolysiloxane (dimethicone), hydrogen dimethicone, methylhydrogenpolysiloxane, a combination of methylhydrogenpolysiloxane and dimethylpolysiloxane, and a combination of dimethicone and hydrogen dimethicone.

[0041] The cosmetic composition of the present invention may contain a silicone surfactant. Examples of the silicone surfactant include PEG-11 methyl ether dimethicone (INCI), PEG / PPG-20 / 22 butyl ether dimethicone (INCI), PEG-3 dimethicone (INCI), PEG-10 dimethicone (INCI), PEG-9 polydimethylsiloxyethyl dimethicone (INCI), lauryl PEG-9 polydimethylsiloxyethyl dimethicone (INCI), cetyl PEG / PPG-10 / 1 dimethicone (INCI), polyglyceryl-3 disiloxane dimethicone (INCI), polyglyceryl-3 polydimethylsiloxyethyl dimethicone (INCI), and lauryl polyglyceryl-3 polydimethylsiloxyethyl dimethicone (INCI).

[0042] The cosmetic of the present invention may contain a preservative. Examples of the preservative include phenoxyethanol, chlorphenesin, pentylene glycol, hexylene glycol, methylparaben, and propylparaben. The cosmetic of the present invention may contain an antioxidant. Examples of the antioxidant include tocopherol, vitamin C, and BHT. [Example]

[0043] The present invention will be further explained below with reference to examples and comparative examples, but the present invention is not limited to these.

[0044] <Production Example 1: Extraction of polyisoprene (A-1) from eucommia leaves> Eucommia leaves were harvested, dried in a microwave oven (600W, 2450MHz, 10 minutes), and then crushed in a blender (2500 rpm, 30 seconds). To remove low-molecular-weight compounds, 2 g of crushed eucommia leaves were placed in a cylindrical filter and subjected to Soxhlet extraction with ethanol (Wako Grade 1, Fujifilm Wako Pure Chemical Industries, Ltd.) under nitrogen for 24 hours. This was followed by Soxhlet extraction with toluene (special reagent grade, Fujifilm Wako Pure Chemical Industries, Ltd.) under nitrogen for 24 hours to obtain trans-polyisoprene extract. The resulting extract was adjusted to a toluene solution with a polyisoprene concentration of 0.1-1% and added dropwise to at least 20 times the volume of methanol to cause solvent precipitation. The precipitate was recovered as polyisoprene. Solvent precipitation was repeated three times, followed by recrystallization with hexane to obtain trans-polyisoprene (A-1) derived from eucommia leaves.

[0045] <Production Example 2: Extraction of polyisoprene (A-2) from Eucommia trees> After harvesting, Eucommia wood was crushed in a blender (2500 rpm, 30 seconds). To remove low-molecular-weight compounds, 2 g of crushed Eucommia wood was placed in a cylindrical filter and subjected to Soxhlet extraction with ethanol (Wako Grade 1, Fujifilm Wako Pure Chemical Industries, Ltd.) under nitrogen for 24 hours. Next, Soxhlet extraction with toluene (special reagent grade, Fujifilm Wako Pure Chemical Industries, Ltd.) under nitrogen for 24 hours was performed to obtain a trans-polyisoprene extract. The resulting extract was adjusted to a toluene solution with a polyisoprene concentration of 0.1-1% and added dropwise to 20 times or more of methanol to remove impurities. Solvent precipitation was repeated three times, followed by recrystallization with hexane to obtain Eucommia wood-derived trans-polyisoprene (A-2).

[0046] <Production Example 3: Gutta-percha-derived polyisoprene (A-3)> Sap collected from gutta-percha trees was pulverized in a mill mixer (manufactured by IWATANI) to obtain gutta-percha-derived trans-polyisoprene (A-3).

[0047] <Example 1: Production of coated particles 1> 0.05 g of eucommia leaf-derived polyisoprene (A-1) and 10 g of cellulose particles 1 (product name: CELLULOBEADS D-5, manufactured by Daito Kasei Kogyo Co., Ltd.) were placed in a porcelain mortar and ground for 1 hour with a porcelain pestle. 0.1 g of palmitic acid dextrin was then added, and the mixture was ground for 1 hour with a porcelain pestle to obtain coated particles 1.

[0048] <Example 2> 0.01 g of eucommia-derived polyisoprene (A-2) and 10 g of cellulose particles 2 (product name: CELLULOBEADS D-10, manufactured by Daito Kasei Kogyo Co., Ltd.) were placed in a porcelain mortar and ground for 20 minutes with a porcelain pestle. 0.1 g of palmitic acid dextrin was then added, and the mixture was ground for 20 minutes with a porcelain pestle to obtain coated particles 2.

[0049] Example 3 0.03 g of eucommia-derived polyisoprene (A-2) and 10 g of cellulose particles 3 (product name: CELLULOBEADS USF-X, manufactured by Daito Kasei Kogyo Co., Ltd.) were placed in a porcelain mortar and ground for 10 minutes with a porcelain pestle. 0.1 g of palmitic acid dextrin was then added, and the mixture was ground for 10 minutes with a porcelain pestle to obtain coated particles 3.

[0050] <Examples 4 to 10, Comparative Examples 1 to 4> Coated particles 4 to 10 and comparative coated particles 1 to 4 were produced by the same procedure as in Example 1, except that the types and weights of the cellulose particles, polyisoprene (A), and ester compound (B) of a sugar compound formed by the bonding of two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms used in Example 1 were changed to those shown in Tables 1 and 2.

[0051] The coated particles 1 to 10 produced in Examples 1 to 10 and the comparative coated particles 1 to 4 produced in Comparative Examples 1 to 4 were evaluated for the degree of surface hydrophobicity of the coated particles, the softness felt on the skin, the moist feeling, and the rolling feeling, and the results are shown in Tables 1 and 2.

[0052] [Table 1]

[0053] [Table 2]

[0054] The raw materials used in Tables 1 and 2 were as follows: Cellulose particles 1: Cellulose particles with a number-average particle diameter of 5 μm, product name "CELLULOBEADS D-5" manufactured by Daito Chemical Industry Co., Ltd. Cellulose particles 2: Cellulose particles with a number-average particle size of 10 μm, product name "CELLULOBEADS D-10" manufactured by Daito Chemical Industry Co., Ltd. Cellulose particles 3: Cellulose particles with a number-average particle size of 3 to 5 μm, product name "CELLULOBEADS USF-X" manufactured by Daito Chemical Industry Co., Ltd. Silica particles: Silica particles with a number average particle size of 5 μm, product name "Sunsphere H-5" manufactured by AGC Si-Tech Co., Ltd. Synthetic polyisoprene (A-4): Reagent "Polyisoprene (trans form)" manufactured by Sigma-Aldrich Palmitic acid dextrin: Trade name "Leopearl KL2" (substitution degree 2), manufactured by Chiba Flour Milling Co., Ltd. Dextrin myristate: Product name "Leopearl MKL2" (substitution degree 2), manufactured by Chiba Flour Milling Co., Ltd. Inulin stearate: Leopearl ISL2 (substitution degree 3), manufactured by Chiba Flour Mills Co., Ltd. Dextrin (palmitate / ethylhexanoate): product name "Leopearl TT2" (substitution degree 1.5, manufactured by Chiba Flour Mills Co., Ltd.)

[0055] <Degree of surface hydrophobicity of coated particles> If the degree of surface hydrophobicity of the coated particles is good, the coated particles will not disperse in water even when mixed with water, and will float to the water surface. Utilizing this, the proportion of particles floating on water among the coated particles obtained in the examples or comparative examples was quantified using the evaluation method described below, and the degree of surface hydrophobicity of the coated particles (degree of coating treatment) was evaluated. 0.1 g of the coated particles obtained in the Examples or Comparative Examples was placed in a 30 mL beaker containing 24.9 g of purified water, and the mixture was stirred for 30 minutes using a magnetic stirrer. Using a syringe (5 cc capacity), 1 to 2 cc of the coated particles dispersed in the purified water, avoiding the particles on the surface of the water, was collected together with the purified water used as the dispersion medium, as a coated particle dispersion. The weight of the collected coated particle dispersion was measured, and the total amount of the collected coated particle dispersion was dried at 105°C for 1 hour using a normal air dryer, and the dry weight was then measured. The measured weight was substituted into the following formula to calculate the proportion (wt%) of particles floating in water, and the results are shown in Tables 1 and 2 as the degree of surface hydrophobicity of the coated particles obtained in the examples or comparative examples. Degree of surface hydrophobicity of coated particles (%) = [1 - {(25 × dry weight of coated particle dispersion collected with syringe (g)) / (amount of coated particle dispersion collected with syringe (g)) / 0.1}] × 100

[0056] <Evaluation of the softness of coated particles> The softness of the coated particles obtained in the Examples and Comparative Examples was evaluated by a sensory test conducted by 10 monitors. Specifically, a small amount of each powder was applied to the back of the hand or the inside of the forearm with the fingers, and the softness felt on the skin was evaluated on a 5-point scale from 1 point (very hard) to 5 points (very soft), and the average value was calculated. The results are shown in Tables 1 and 2. By using coated particles with good softness, it is possible to obtain a cosmetic product that feels good when used.

[0057] <Evaluation of moist feeling of coated particles> The coated particles obtained in the Examples and Comparative Examples were evaluated for moisturizing sensation by a sensory test conducted by 10 monitors. Specifically, a small amount of each powder was applied to the back of the hand or the inside of the forearm with the fingers, and the moisturizing sensation felt on the skin was evaluated on a 5-point scale from 1 point (very dry) to 5 points (very moist), and the average value was calculated. The results are shown in Tables 1 and 2. By using coated particles that have a good moist feeling, it is possible to obtain a cosmetic that is pleasant to use.

[0058] <Evaluation of the rolling sensation of coated particles on the skin> The rolling sensation of the coated particles obtained in the Examples and Comparative Examples was evaluated by a sensory test conducted by 10 monitors. Specifically, a small amount of each powder was applied to the back of the hand or the inside of the forearm with the fingers, and the rolling sensation felt on the skin was evaluated on a 5-point scale from 1 point (very poor rolling sensation) to 5 points (very good rolling sensation), and the average value was calculated. The results are shown in Tables 1 and 2. By using coated particles that have a good rolling feel, it is possible to obtain a cosmetic that has a good feel when used.

[0059] It can be seen that the coated particles 1 to 10 of Examples 1 to 10 have a better feel when used than the comparative coated particles 1 to 4 of Comparative Examples 1 to 4. The comparative coated particles 1 of Comparative Example 1, which did not contain the ester compound (B), were insufficiently hydrophobic and had a poor feel when used. The comparative coated particles 2 of Comparative Example 2, in which the content of polyisoprene (A) exceeded 2.0% by weight based on the weight of the cellulose particles, were insufficient in terms of moist feeling and rolling feel when used. The comparative coated particles 3 of Comparative Example 3, which did not contain polyisoprene (A), were insufficiently hydrophobic and had a poor feel when used. Comparative coated particles 4 of Comparative Example 4, which used silica particles instead of cellulose particles, had a poor feel when used.

[0060] <Examples 11 to 22 and Comparative Examples 5 to 8> The components shown in Tables 3 and 4 were blended to the contents (% by weight) shown in Tables 3 and 4. The mixture was mixed uniformly, poured into a mold, and molded to obtain a pressed foundation. The press foundations produced in Examples 11 to 22 and the press foundations produced in Comparative Examples 5 to 8 were evaluated for moisturizing feeling and stickiness. The results are shown in Tables 3 and 4.

[0061] [Table 3]

[0062] [Table 4]

[0063] The raw materials used in Tables 3 and 4 were as follows: Squalane: Olive Squalane manufactured by Kokyu Alcohol Kogyo Co., Ltd. Neopentyl glycol diethylhexanoate: "KAK NDO" manufactured by Kokyu Alcohol Kogyo Co., Ltd. Dimethicone: Shin-Etsu Chemical Co., Ltd. "KF-96A-20CS" Hydrogen dimethicone-treated talc: "SI01-2 TALC JA-46R" manufactured by Daito Kasei Kogyo Co., Ltd. Dimethicone-treated sericite: "SI01-2 SERICITE FSE" manufactured by Daito Kaseisha Kogyo Co., Ltd. Hydrogen dimethicone-treated titanium dioxide: Daito Kasei Kogyo Co., Ltd. "SI01-2 TiO2 MT 500SA" Dimethicone-treated yellow iron oxide: Daito Kaseisha Kogyo Co., Ltd. "SI-2 YELLOW LL-100P" Dimethicone-treated red iron oxide: Shin-Etsu Chemical Co., Ltd. "KTP-09R" Dimethicone-treated black iron oxide: "SI-2 BLACK BL-100P" manufactured by Daito Kaseisha Kogyo Co., Ltd.

[0064] <Evaluation of moisturizing sensation> The pressed foundations produced in Examples 11 to 22 and the pressed foundations produced in Comparative Examples 5 to 8 were each applied evenly to the skin, and the moisturizing feeling on the skin thereafter was evaluated by 10 monitors. The evaluation criteria are as follows, and the total score was used as the evaluation result.

[0065] [Evaluation criteria for moisturizing feeling] Moisturizing feeling: 3 points Slightly moisturizing: 2 points No moisturizing sensation: 1 point

[0066] <Evaluation of stickiness> The pressed foundations produced in Examples 11 to 22 and the pressed foundations produced in Comparative Examples 5 to 8 were each applied evenly to the skin, and the stickiness of the applied foundations on the skin was evaluated by 10 monitors. The evaluation criteria were as follows, and the total score was used as the evaluation result.

[0067] [Evaluation criteria for stickiness] No stickiness: 3 points Slightly sticky: 2 points Sticky feeling: 1 point

[0068] Tables 3 and 4 show that the pressed foundations of Examples 11 to 22 have a better moisturizing feel and are not sticky compared to the pressed foundations of Comparative Examples 5 to 8.

[0069] <Examples 23 to 34, Comparative Examples 9 to 11> The components shown in Tables 5 and 6 were blended to the contents (wt %) shown in Tables 5 and 6 and mixed uniformly to obtain a liquid foundation. The liquid foundations produced in Examples 23 to 34 and the liquid foundations produced in Comparative Examples 9 to 11 were evaluated for moisturizing feeling and stickiness. The results are shown in Tables 5 and 6.

[0070] [Table 5]

[0071] [Table 6]

[0072] The raw materials used in Tables 5 and 6 were as follows: Isododecane: "PUROLAN IDD" manufactured by DKSH Japan Co., Ltd. Isotridecyl isononanoate: "KAK 139" manufactured by Kokyu Alcohol Kogyo Co., Ltd. Polyglyceryl-2 Isostearate: Cosmol 41V, Nisshin Oillio Group Co., Ltd. PEG-9 polydimethylsiloxyethyl dimethicone: Shin-Etsu Chemical Co., Ltd. "KF-6028" Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone: Shin-Etsu Chemical Co., Ltd. "KF-6038" Quaternium-18 Bentonite: "Moistite-WO" manufactured by Kunimine Kogyo Co., Ltd. Phenoxyethanol: "Newpol EFP" manufactured by Sanyo Chemical Industries, Ltd. Tocopherol: Nisshin Oillio Group Co., Ltd. "Tocopherol 100"

[0073] Tables 5 and 6 show that the liquid foundations of Examples 23 to 34 have a better moisturizing feel and are not sticky compared to the liquid foundations of Comparative Examples 9 to 11. [Industrial Applicability]

[0074] The coated particles for cosmetics of the present invention have a hydrophobic surface and provide a good feeling when used, such as softness, moist feeling, and rolling feeling. When added to cosmetics, the moist feeling of the cosmetics is improved and stickiness can be reduced. The composition can be suitably used in the various cosmetic compositions mentioned above, but is more preferably used in cosmetic compositions that are applied for purposes such as decorating and protecting the skin and hair, and is particularly preferably used in makeup cosmetics, UV care cosmetics, antiperspirants, and the like.

Claims

1. Coated particles for cosmetics, comprising a coating layer on at least a portion of the surface of a cellulose particle, the coating layer comprising polyisoprene (A) and an ester compound (B) of a sugar compound formed by bonding two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms, the content of the polyisoprene (A) is 0.1% by weight or more and less than 2.0% by weight based on the weight of the cellulose particles, BET specific surface area: 0.1 to 60 m ２ / g of coated particles for cosmetics.

2. 2. The coated particles for cosmetics according to claim 1, wherein the content of the ester compound (B) of the sugar compound formed by the bonding of two or more monosaccharides with a fatty acid having 8 to 28 carbon atoms is 0.1 to 10% by weight based on the weight of the cellulose particles.

3. A cleanser containing the coated particles for cosmetics according to claim 1 or 2.

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