JP2007182392A - Optical coloring body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an optical coloring body for a non-toxic and chemically stable cosmetic composition by utilizing a principle except a coloration method by absorption of a part of light like a conventional colorant such as pigment, coloring matter, dye, etc., and utilizing colloidal microcrystal of spherical nano fine particle developing a clear structural color observed in all directions and its cosmetic composition. <P>SOLUTION: The optical coloring body comprises a liquid medium and micelles including colloidal microcrystal of flocculated spherical nano fine particles of single substance and same particle diameters. The micelle-forming agent of the micelle is reinforced by a polymer. The cosmetic composition is colored by the optical coloring body. The colloidal microcrystal of spherical nano fine particle of the optical coloring body selectively reflects, refracts and interferes light and develops of a color of light of specific wavelength under light irradiation by a photonic band effect. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an optical color former that develops color by reflection, interference, refraction, and absorption of light, particularly for use in cosmetic compositions.

The present invention also relates to a cosmetic composition comprising the optical color former in a cosmetically acceptable medium.

In the field of cosmetics, pigments, pigments, dyes and the like are generally widely used as coloring materials for coloring cosmetics. Coloring has been carried out by mixing a certain amount of these coloring materials into a cosmetic composition to fix pigments or pigments to the object to be used, or by dyeing them with dyes. Such conventional color materials such as pigments, pigments, and dyes have different wavelength characteristics of the reflected light from the color material surface due to the wavelength dependency of absorbance on the color material surface, that is, the difference in absorption spectrum characteristics. Therefore, the difference in coloring is recognized by the observer.

In the case of such a color material, it is generally attempted to mix a plurality of color materials in order to obtain a variety of coloring. Conventionally, when used as a cosmetic, an inorganic layered powder such as mica, an additive such as a pearlescent agent and a liquid crystal compound is mixed with a cosmetic composition to give gloss to the surface of skin, nails, hair, etc. Has been done.

For example, a colored pearl agent in which colored powders such as iron oxide, bitumen, chromium hydroxide, and carmine are mixed or coated on mica titanium, which has a pearly luster and interference color, is an indispensable raw material as a glossy coloring material for cosmetics. ing.
Development of functional cosmetics, CMC, 297-306 (2000)

However, mixing conventional color materials does not necessarily make it possible to take advantage of the characteristics of each color material alone, because each color material becomes a subtractive color mixture by absorbing light. Depending on the combination, the saturation tends to decrease.

In addition, the additive itself such as the inorganic layered powder, pearlescent agent, liquid crystal compound, etc. is colorless and white, or has little variety of coloring, so it is used in combination with other coloring materials to obtain the desired coloring. Must. In that case, the glossiness required by these additives cannot always be generated from a combination with a color material having low saturation and lightness.

On the other hand, the colored powder mixed in the colored pearl agent, which is considered to have good saturation in the conventional combination, is not necessarily chemically stable, such as bitumen, which is weak in alkali resistance and heat resistance, and carmine, which is weak in light resistance. It is not always excellent.

Furthermore, there are many conventional pigments, pigments, dyes and the like that do not completely satisfy the requirements for the effects on the skin, etc., depending on the amount used.

Therefore, the present invention utilizes a principle other than the coloring method by absorbing a part of light as in the case of a conventional color material, and is non-toxic and chemically chemically developing a structural color vividly from any direction. It is an object of the present invention to provide an optical color former for a stable cosmetic composition and a cosmetic composition comprising them.

In order to solve the above-mentioned problems, the present inventor has found a novel optical color former for a cosmetic composition utilizing the photonic band effect.

In the field of optics, a structure having a repeating unit (periodic pattern) of the order of the light wavelength of substances having different refractive indexes is known as a photonic crystal. A structure having a repeating unit of a half-wavelength of a certain monochromatic light wavelength (which varies depending on the refractive index of the medium in a medium other than air) has a frequency at which no electromagnetic mode can exist. There is a region (photonic band gap), which is forbidden for the monochromatic light. This is called the photonic band effect. When light is irradiated onto the surface of the photonic crystal, light having a specific wavelength in the photonic band gap region corresponding to the length of the repeating unit is completely reflected.

In the optical field, an attempt has been made to use a photonic crystal for an optical waveguide, a new type of optical fiber, or the like by utilizing the property of the photonic band effect that can completely reflect light of a specific wavelength.

On the other hand, in order to utilize the photonic band effect in the cosmetic field of the present invention, a photonic crystal that exhibits the above effect is formed, and the photonic crystal is stable in various cosmetic compositions. Crystals need to be mixed. However, in the field of cosmetic products, there has been no report on coloring materials in the form of granules, spheres, etc. that make it possible to disperse photonic crystals in a medium from such a viewpoint.

Based on the above points, the present inventor has already invented an invention relating to an optical color former comprising micelles containing a liquid medium, and preferably a colloidal microcrystal in which spherical nanoparticles having the same particle diameter are aggregated with a single material. Is going. The optical color former is configured such that the colloidal microcrystals selectively emit light of a specific wavelength under light irradiation by selectively reflecting, refracting, and interfering with light of a specific wavelength by a photonic band effect. Features.

The optical color former can be colored in any visible light region such as red, green, blue, etc. by changing the size of the spherical nano-particles to be used.

In addition to this, the invention of the present application aims to improve the above-mentioned optical color former and to provide structural reinforcement so that each micelle of the optical color former can be stabilized in the micelle formation state.

Specifically, the invention of the present application is an optical system comprising a micelle containing a liquid medium and colloidal microcrystals in which spherical nanoparticles are aggregated, and the micelle-forming agent of the micelle is reinforced by a polymer. The present invention relates to a color former and a method for producing the same.

Furthermore, the present invention relates to a cosmetic composition containing the optical color former.

In addition, since the surface of the optical color former is covered with a partition wall that is harmless to the human body, studies on the effects on living bodies such as skin and hair that occur in conventional pigments and dyes are greatly conducted. Can be reduced.

Furthermore, in addition to the coloring effect of the optical color former, the effect as a microcapsule can be obtained by simultaneously enclosing another substance in the micelle.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing an embodiment of the optical color body of the present invention. The optical color body 10 of the present invention comprises a liquid medium 11 and micelles containing colloidal microcrystals 13 in which spherical nano-particles 12 of the same material and the same particle diameter are aggregated. The micelles are reinforced by being added to the oil and formed in the oil and entering the gaps of the micelle forming agent 14 in which the polymer aggregates at the micelle interface.

The liquid medium 11 is a polar liquid, preferably water or an aqueous solvent such as C ₁ -C ₁₂ monoalcohol, preferably C ₂ -C ₆ monoalcohol, most preferably ethanol. , And a mixed solvent thereof. Particularly preferred is water or an aqueous solution, in which case the micelle is of the water-in-oil type as shown in FIG.

The colloidal microcrystal 13 is a microcrystal in a state in which a large number of spherical nanoparticles 12 are aggregated by a regular arrangement. The spherical nanoparticle 12 constituting the colloidal microcrystal 13 is preferably a single material and a particle having the same particle size. The colloidal microcrystal 13 in which spherical nanoparticles are arranged is a colloidal microcrystal in which spherical nanoparticles in a suspension of spherical nanoparticles are stabilized by electrostatic repulsion or excluded volume effect. The liquid of the suspension may be a liquid that stabilizes the form of the colloidal microcrystal. The concentration of the suspension of spherical nanoparticles is preferably an amount sufficient to prepare micelles.

The liquid in which the spherical nanoparticles are suspended is selected from a medium and a mixture thereof, which can keep the spherical nanoparticles finely chemically stable, and the refractive index of the liquid is smaller than that of the spherical nanoparticles. In particular, water is preferable, or C ₁ -C ₁₂ monoalcohol, etc., preferably C ₂ -C ₆ monoalcohol, etc., and most preferably methanol, ethanol, a liquid having polarity, and a mixture thereof.

The spherical nano-particles 12 are selected from materials that are optically transparent to light having a target wavelength to be developed by the optical color former and stable to the liquid medium 11. For example, when d-limonene is selected as the medium 16 of the external phase, it is selected from inorganic materials such as glass, silica, and titania, and insoluble polymers such as silicone. Further, the material of the spherical nano-particles 12 has a refractive index larger than the refractive index of the liquid medium 11, and particularly has a refractive index larger than the refractive index of water 1.33 when the liquid medium is water. Selected from. Alternatively, the refractive index of the fine particles may be smaller if it is not equal to the refractive index of the surrounding liquid medium.

The particle size of the spherical nanoparticle 12 is selected from the range of 50 nm to 500 nm depending on the wavelength of the target light to be developed by the optical color former. Here, one colloidal microcrystal 13 is an aggregate composed of spherical nano-particles having the same particle diameter. However, for the purpose of color mixing, the first colloidal microcrystal composed of the first spherical nanoparticle having the same particle size, the second colloidal microcrystal composed of the second spherical nanoparticle of the same particle size, and more This does not prevent the colloidal microcrystals composed of spherical nano-particles of the same particle size from being mixed in the same micelle.

The micelle forming agent 14 used for preparing micelles may be selected from any surfactant, emulsifier and the like. Preferably, it should be mixed directly into the cosmetic composition to satisfy the stability required by the intended use. In order to improve micelle stability, a crosslinkable surfactant or the like may be used. For example, when d-limonene is selected as the medium 16 of the external phase, sorbitan trioleate (Span 85) is preferable.

The polymer 15 is used to structurally reinforce and stabilize the micelle forming agent 14 of micelles. Here, the polymer used may have any molecular structure and any molecular weight as long as the polymer has the above-described effects. Preferably, the polymer used is a polymer that is easily dissolved in the oil phase of the micelle and has a high affinity for the surfactant, emulsifier, and the like that are the micelle forming agent. For example, when d-limonene is selected as the medium 16 of the outer phase, polystyrene is preferable.

The medium 16 of the micelle outer phase has a high polymer dissolving ability and can form a desired micelle by a combination of the micelle-forming agent and the internal medium, and has an absorbance with respect to the wavelength of light to be developed by the optical color former. A low or preferably transparent organic solvent. For example, d-limonene is preferred when polystyrene is selected as the polymer. The solvent 16 of the micelle outer phase may be replaced with an arbitrary organic solvent or aqueous solvent after the formation of the micelle of the optical color former. Examples of the medium used in this case include water, alcohol, and C ₆ -C ₂₈ alkane. It is done. In order to suppress the attenuation of the emission color due to effects such as light refraction and scattering, it is preferable that the difference in refractive index between the solvent and water in the micelle outer phase is smaller. The solvent of the micelle outer phase is selected from media that can be used as a cosmetic when it is used as an optical color former in a cosmetic composition. The liquid may be a liquid mixture having the characteristics described above.

The present invention also relates to a method for producing the optical color body.

The optical color former includes a solution in which the polymer and the micelle-forming agent are dissolved in a solvent serving as the outer phase of the micelle, and a suspension of colloidal microcrystals in which the spherical nanoparticles that are the inner phase of the micelle are aggregated. Are mixed to form a colloidal microcrystal in which the spherical nanoparticles are arranged in the micelle inner phase.

The optical color former is further mixed with a solution in which the micelle-forming agent is dissolved in a solvent that is the outer phase of the micelle, and a suspension of colloidal microcrystals in which the spherical nanoparticles that are the inner phase of the micelle are aggregated. It is also possible to produce a micelle by forming a colloidal microcrystal in which the spherical nano-particles are arranged in the micelle inner phase, and then dissolving the polymer in the outer phase of the micelle to reinforce the micelle. Good.

The temperature at the time of micelle preparation may be any temperature as long as the desired micelle can be formed, but is preferably 50 to 70 ° C., and particularly d-limonene, micelle as a medium serving as an external phase. When sorbitan trioleate (Span 85) is selected as the forming agent, the above temperature is preferred.

The micelle 16 of the micelle outer phase may further include a step of washing and replacing with any organic solvent or aqueous solvent after the formation of the micelle of the optical color former. In this case, for example, when d-limonene is selected as the medium 16 of the micelle outer phase, it is washed and replaced with a medium usable as a cosmetic such as water, alcohol, C ₆ -C ₁₈ alkane.

The present invention also relates to a cosmetic composition comprising the optical color former in a cosmetically acceptable medium.

In the present invention, the optical color former may be present alone or as a mixture in the composition, and is 0.01% to 75%, preferably 0.1% to 20%, based on the total weight of the composition. It is particularly preferably present in an amount of 0.5% to 10%, more preferably 1% to 8%, optimally 1.5% to 5%.

The cosmetic composition according to the present invention comprises, in addition to the optical color former, a cosmetically acceptable medium, that is, a medium compatible with keratin materials such as the skin of the face or body, hair, eyelashes, eyebrows and nails. Comprising.

Accordingly, the cosmetic composition can contain water or a linear or branched lower monoalcohol containing 2 to 5 carbons, such as hydrophilic organic solvents such as ethanol, isopropanol or n-propanol, and glycerol, glycerol, propylene glycol, sorbitol or pentylene glycol, and may include alcohols, such as polyol, such as polyethylene glycol, or a hydrophilic medium comprising mixed medium of the hydrophilic C ₂ ethers and C ₂ -C ₄ aldehydes and water. The water or a mixture of water and a hydrophilic organic solvent is present in the composition of the present invention in an amount ranging from 0.1% to 99%, preferably from 10% to 80%, based on the total weight of the composition. You can do it.

The cosmetic composition may also be anhydrous. The composition also includes fatty substances that are liquid at room temperature (generally 25 ° C.) and / or fatty substances that are solid at room temperature, such as waxes, pasty fatty substances and gums, and mixtures thereof. It may contain a fatty phase. The fatty substance is of animal, vegetable, mineral or synthetic origin. The fatty phase may contain a lipophilic organic solvent. Fatty substances that are liquids at room temperature, commonly referred to as oils, used in the present invention may be made of animal-derived hydrocarbon-based oils such as perhydrosqualene; Liquid triglycerides of fatty acids (eg, heptanoic acid or octanoic acid triglycerides) or alternatively sunflower oil, corn oil, soybean oil, grape seed oil, sesame seed oil, apricot oil, macadamia oil, castor oil, avocado It may be a hydrocarbon vegetable oil such as oil, caprylic / capric triglyceride, jojoba oil, shea butter; liquid paraffin and derivatives thereof, hydrogenated isobutene such as petrolatum, polydecene, perleme, synthetic esters and ethers (eg per Serine oil, isopropyl myristate, 2-ethylhexyl palmitate, Stearic acid-2-octyldodecyl, erucic acid-2-octyldodecyl, especially stearic acid isostearyl, etc., fatty acid esters (eg, isostearyl lactate, octyl hydroxystearate, octyldodecyl hydroxystearate, Diisostearyl malate, triisocetyl citrate), fatty alcohols of heptanoic acids, octanoic acids, decanoic acids, polyol esters (for example, propylene glycol dioctanoate, neopentyl glycol diheptanoate, diethylene glycol diisononanoate), pentaerythritol esters Fatty alcohols containing 12 to 26 carbon atoms (eg octyldodecanol, 2-butyloctanol, 2-hexyloctanol, 2-undecylpenta Canols and oleyl alcohols), hydrocarbon-based partially fluorinated oils and / or silicone-based partially fluorinated oils, volatile or non-volatile silicone oils, linear or cyclic polymethylsiloxanes which are liquid or pasty at room temperature (PDMSs) (eg, cyclomethicones, dimethicones, optionally phenyltrimethicones, phenyltrimethoxylucyloxydiphenylsiloxanes, diphenylmethyldimethyltrisiloxanes, diphenylfimethicones, phenyldimethicones, polymethyl It may be linear or branched minerals such as phenylsiloxanes) or synthetic hydrocarbons; mixtures thereof. These oils can be present in an amount ranging from 0.01% to 90%, more preferably from 0.1% to 85%, based on the total weight of the composition.

The cosmetic composition according to the present invention may contain one or more physiologically acceptable organic solvents. The solvent is generally from 0.1% to 90%, preferably from 0.5% to 85%, more preferably from 10% to 80%, even more preferably from 30% to 50%, based on the total weight of the composition. It may be present in an amount in the range of%. In particular, as the solvent, in addition to the lipophilic organic solvent, ketones that are liquid at room temperature (for example, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, isophorone, cyclohexanone, acetone); propylene glycol ethers that are liquid at room temperature ( For example, propylene glycol monomethyl ether acetate and dipropylene glycol mono n-butyl ether); short chain esters (totally containing 3 to 8 carbon atoms) (eg ethyl acetate, methyl acetate, propyl acetate, n-acetate) Butyl, isopentyl acetate); ethers that are liquid at 25 ° C. (eg, diethyl ether, dimethyl ether or dichlorodiethyl ether); alkanes that are liquid at 25 ° C. (eg, decane, heptane, dodecane, isododecane, cyclohexane). Sun); 25 ° C. The aromatic ring compounds which are liquid (e.g., toluene, xylene); 25 ° C. with aldehydes which are liquid (e.g., benzaldehyde, acetaldehyde); and a mixture thereof is used.

The cosmetic composition according to the invention may also contain one or more physiologically acceptable waxes. For the purposes of the present invention, the term “wax” is oleophilic which is solid at room temperature (25 ° C.) and undergoes a reversible solid / liquid phase change and has a melting point between 25 ° C. and 120 ° C. Means a compound. The waxes are hydrocarbon-based waxes, fluorinated waxes and / or silicone waxes and are derived from plants, minerals, animals and / or synthetics. In particular, the wax has a melting point above 30 ° C, more preferably above 45 ° C. Waxes used in the compositions of the present invention include beeswax, carnauba wax or candellila wax, paraffin, microcrystalline wax, ceresin or ozokerite, synthetic waxes (eg, polyethylene waxes or Fischer-Tropsch) -(Fischer-Tropsch) wax), silicon wax (for example, alkyl or alkoxy dimethicones containing 16 to 45 carbon atoms). The rubber is typically high molecular weight polydimethylsiloxanes (PDMSs) or cellulose gums or polysaccharides, and the pasty materials are generally hydrocarbon-based compounds (eg, lanolins and Their derivatives or polydimethylsiloxanes (PDMSs)). Its nature and amount of solid material depends on the required mechanical properties and texture. As a guide, the composition contains waxes in a weight range of 0.1% to 50%, more preferably 1% to 30%, based on the total weight of the composition.

The cosmetic composition according to the present invention may further comprise pigments and / or nacres and / or fillers that are usually used in cosmetic compositions in the particulate phase. The composition may also contain other dyes selected from water-soluble dyes and / or fat-soluble dyes well known to those skilled in the art. The term “pigment” is understood to be white or colored, mineral or organic particles of any shape, insoluble in physiologically acceptable media and intended to color the composition. The The term "filler" is colorless or white, mineral or synthetic, lamellar or non-lamellar particles that give the composition stickiness, stiffness, and / or flexibility, with a matte effect and uniform on the makeup result. It is understood to give sex. The term “pearl mother” is understood to be iridescent particles of any shape, in particular those made or synthesized by a particular mollusk shell. The pigment is present in the composition in a proportion of 0.01% to 25%, preferably 3% to 10%, based on the weight of the final composition. The pigments include titanium oxide, zirconium oxide or cerium oxide, zinc oxide, iron oxide or chromium oxide, iron blue, chromium hydrate, carbon black, ultramarine (ultramarines: aluminosilicate polysulfide), manganese pyrophosphate. Calcium salts, barium salts, aluminum salts, strontium, which may be a material of salt and certain metallic powders (eg powdered silver or aluminum powder), and is generally used to give makeup to the lips and skin D & C dyes and lakes that are salts or zirconium salts may be used. The mother of pearl is present in the composition in a proportion by weight of 0.01% to 20%, preferably 3% to 10%. Possible pearl mica may be natural pearls or mica coated with titanium oxide, iron oxide, natural pigments or bismuth acid chloride, and colored titanium mica. In the composition, the fat-soluble or water-soluble dye is present alone or as a mixture, and is 0.001% to 15%, preferably 0.01% to 5%, particularly preferably based on the total weight of the composition. It may be present at a rate of 0.1% to 2%, and includes ponceau disodium salt, alizarin green disodium salt, quinoline yellow, amaranth trisodium salt, tartrazine Disodium salt, rhodamine sodium salt, fuchsin disodium salt, xanthophyll, methylene blue, cochineal carmine, halo-acid dye, azo dye, anthraquinone dye, copper sulfate, iron sulfate ( Green candy), Sudan Brown, Sudan Red and Annatto, and beetroot juice and carotene There.

The cosmetic composition according to the invention may contain one or more fillers, in particular from 0.01% to 50%, preferably from 0.02% to 30%, based on the total weight of the composition. It may be present in a range amount. The filler is a mineral type or synthetic type having any shape of flat plate, sphere or ellipsoid, and includes talc, mica, silica, kaolin, polyamide (nylon (registered trademark) powders, and poly β-alanine powder. And polyethylene powder, tetrafluoroethylene polymer (Teflon (registered trademark) powders, lauroyllysine, starch, boron nitride, hollow polymer globules (polyvinylidene chloride / acrylonitrile hollow polymer globules, etc., such as Expancel (registered trademark)) ) (Nobel Industrie) or acrylic acid copolymer (Polytrap® from Dow Corning) and silicone resin beads (eg Tospearls® from Toshiba), elastomeric polyorganosiloxane powder, precipitated calcium carbonate , Magnesium carbonate, magnesium hydrogen carbonate, hydroxyapata , Hollow silica microspheres (Maprecos Silica Beads®), glass or ceramic microcapsules, and metal soaps derived from organic carboxylic acids containing 8 to 22, preferably 12 to 18 carbon atoms (Eg, zinc stearate, magnesium stearate, lithium stearate, zinc laurate, or magnesium myristate).

The cosmetic composition according to the present invention may further comprise a polymer such as a film-forming polymer. According to the present invention, the term “film-forming polymer” refers to a polymer that can form a continuous film that adheres to and supports a keratin material in the presence of a polymer alone or an auxiliary film-forming agent. Means. The film-forming polymers used in the compositions of the present invention are synthetic polymers of free radical type or polycondensation type, naturally derived polymers, and mixtures thereof, in particular acrylic polymers, polyurethanes, polyesters, polyamides, Materials such as polyureas and cellulose-based polymers (eg, nitrocellulose) may be used.

The cosmetic composition according to the present invention comprises vitamins, thickeners, gelling agents, trace elements, softeners, sequestering agents, fragrances, oxidizing agents or alkalizing agents, preservatives, sunscreen agents, surfactants. In addition, it may further contain components generally used for cosmetic purposes, such as antioxidants, agents for preventing hair loss, anti-dandruff agents, propellants, ceramides, and mixtures thereof.

Needless to say, the person skilled in the art is able to select this or these optional additional compounds, and / or their amounts, because the advantageous characteristics of the composition according to the invention depend largely on the additive selected. Be careful not to be adversely affected.

The composition of the present invention is an oil-in-water suspension or dispersion, in particular by the vesicle method; an optionally thickened or gelled aqueous or oily solution; an oil-in-water, water-in-oil or complex emulsion; a gel or mousse; It may be in the form of oily or emulsified gels; vesicle dispersions, in particular lipid vesicles; two-phase or multiphase lotions; sprays; free-form, molded or cast powders; anhydrous pastes. The composition has the appearance of a lotion, cream, salve, soft paste, ointment, mousse, cast or molded solid, especially stick or dish, or molded solid.

The cosmetic composition of the present invention is a care and / or makeup product, anti-sun product, self-tanning for body or facial skin, lips, nails, eyelashes, eyebrows, and / or hair. Product or form as a product for curling, treating, shaping, making up or coloring hair.

The composition is in the form of a makeup composition, in particular a skin gloss product such as a foundation, makeup apple or eye shadow; a lip product such as a lipstick or lip care product; a concealer product; a blusher, mascara or eyeliner Eyebrow make-up product, lip pencil or eye pencil; nail product (eg nail polish or nail care product); body make-up product; hair make-up product (hair mascara or hair lacquer) Good. Also in the form of a protective or care composition for the skin of the face, neck, hands or body, in particular in the form of an anti-wrinkle composition, a moisturizing or treatment composition; an anti-sun composition or an artificial tanning composition There may be. Also in the form of hair products, in particular coloring, hairstyle retention, hairstyle formation, hair curling, treating or cleansing, eg shampoos, hair setting gels or lotions, blast drying lotions, and fixing and styling It may be in the form of a composition (such as lacquer or spray).

Examples that illustrate the invention are provided but are not intended to limit the invention.

Example 1: Preparation of Silica Suspension (Dispersion) A water suspension of silica fine particles (trade name: Seahoster KE-P30, average particle size: 300 nm, Nippon Shokubai Co., Ltd.) was used using an ultracentrifuge. The concentration of silica fine particles was concentrated to 20% by weight with respect to the total weight.

Example 2 Adjustment of Optical Color Body Surfactant Span 85 (Span 85 (HLB = 1.4), sorbitan trioleate, Wako Chemical Co., Ltd.) prepared to 0.1 M with 2 mL of d-limonene was polystyrene ( 5-10 wt% of an average molecular weight of 200,000, Aldrich) and 10 μL of an aqueous suspension of silica fine particles (average particle size 300 nm) obtained in Example 1 were added, and the mixture was vigorously stirred in a test tube at 50-70 ° C. . Thereafter, the test tube was left in a 50-70 ° C. water bath for 5-10 minutes. To remove excess polystyrene, the supernatant of the resulting mixture was removed, and fresh d-limonene was added instead. This washing process was performed twice. Finally, d-limonene was substituted with heptane and other organic solvents or aqueous solutions to obtain a desired optical color former.

The obtained optical color former is a water-in-oil spherical micelle having a diameter of about 20-40 μm even in the case of silica fine particles, and the angle at which the reflected light is observed is changed with respect to the direction of irradiating white light. Red (0 °: vertical reflection side) to yellow to green to blue (180 ° side) were observed.

FIG. 3 shows that each optical color body is irradiated with a halogen light source of an episcopic microscope, the reflected light is condensed by the microscope, and the reflected light is reflected to a small spectroscope (USB2000, Ocean Optics) by an optical fiber attached to the microscope. Shows the result of measuring the reflection spectrum. An optical color former containing silica fine particles having an average particle diameter of 300 nm was measured using a “grating No. 3” type diffraction grating and a “slit 5 micron” type slit.

From the above measurement results, it has been clarified that an optical color body containing silica fine particles having an average particle diameter of 300 nm can obtain a reflection characteristic having a maximum reflection wavelength of 620 nm.

It is sectional drawing which shows the optical color body of embodiment by this invention. 2 is an optical micrograph of an optical color body produced according to the present invention. It is a reflection spectrum of the optical color body of the embodiment according to the present invention (silica fine particle average particle diameter 300 nm).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical color body 11 Liquid medium of micelle inner phase 12 Spherical nanoparticle 13 Colloid microcrystal 14 Micellar formation agent 15 Polymer 16 Micelle outer phase medium

Claims (15)

An optical color body comprising a micelle containing a liquid medium and colloidal microcrystals in which spherical nanoparticles are aggregated, wherein the micelle forming agent of the micelle is reinforced by a polymer. 2. The optical color body according to claim 1, wherein the colloidal microcrystal selects light of a specific wavelength by the photonic band effect under light irradiation and develops color. The optical color body according to claim 1 or 2, wherein the liquid medium is one medium selected from polar liquids. The optical color body according to any one of claims 1 to 3, wherein the spherical nanoparticles are single-material spherical nanoparticles. The optical color body according to claim 1, wherein the spherical nanoparticles are spherical nanoparticles having the same particle diameter. The optical color body according to claim 1, wherein the spherical nano-particles are optically transparent to the light having the specific wavelength. 7. The optical color body according to claim 1, wherein a refractive index of the material of the spherical nano fine particles is larger or smaller than a refractive index of the liquid medium. The optical color body according to any one of claims 1 to 7, wherein the polymer molecules reinforce the micelles by entering the gaps between the molecules of the micelle forming agent. A cosmetic composition containing the optical color former according to any one of claims 1 to 8. 2. The method of producing an optical color body according to claim 1, wherein a solution in which the polymer and the micelle-forming agent are dissolved in a solvent that is an outer phase of the micelle, and the spherical nanoparticles that are the inner phase of the micelle are aggregated. A method of forming colloidal microcrystals in which the spherical nano-particles are arranged in the micelle internal phase by mixing with a suspension of colloidal microcrystals. 2. The method for producing an optical color body according to claim 1, wherein a solution in which the micelle-forming agent is dissolved in a solvent that is an outer phase of the micelle and a colloidal microcrystal in which the spherical nanoparticle that is the inner phase of the micelle is aggregated. The micelles are formed by mixing with the suspension of, and colloidal microcrystals in which the spherical nanoparticles are arrayed are formed in the micelle inner phase, and then the polymer is dissolved in the outer phase of the micelle to reinforce the micelles. Method. The method for producing an optical color body according to claim 10 or 11, wherein the solvent serving as the outer phase of the micelle is d-limonene, the micelle forming agent is sorbitan trioleate, and the material of the spherical nanoparticle Is an inorganic material, and the polymer is an organic polymer. 13. The method for producing an optical color body according to claim 10, wherein the spherical nano fine particles are silica fine particles, and the polymer is polystyrene. The method for producing an optical color body according to any one of claims 10 to 13, wherein the mixing temperature at the time of micelle preparation is 50 to 70 ° C. 15. The method of producing an optical color body according to claim 10, further comprising a step of washing and replacing the medium of the outer phase of the micelle of the optical color body with another organic solvent or an aqueous solvent. Feature method.