Cosmetic containing oily particles

Abstract

To provide a cosmetic in which particles of a visible size are dispersed in an aqueous solvent.SOLUTION: There is provided a cosmetic containing oily particles which contains a solid fat having a melting point of 40°C or more as an oily component and a polysaccharide represented by a repeating unit of the general formula (1) as a water-soluble polymer in an aqueous solvent.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention is applicable to external compositions such as cosmetics, and relates to a cosmetic preparation containing oily particles in which visible oily particles are dispersed in an aqueous solvent. [Background technology]

[0002] It is important for cosmetics to have skin care and makeup effects on the skin, but it is also important that they are comfortable to use and that the product has an attractive appearance that catches people's attention. In this context, cosmetic compositions are known in which visible particles of a polyion complex formed by an anionic polymer and a cationic polymer are dispersed in an aqueous solvent. For example, capsules of calcium alginate, in which alginic acid, a polysaccharide, is crosslinked with polyvalent ions, are often incorporated into cosmetics (Patent Document 1).

[0003] However, to prepare capsules using polyion complexes, it is necessary to prepare an anionic polymer and a cationic component separately, bring them into contact with each other to form a shell, and then wrap the core of the inclusion in the shell. Therefore, it is usually necessary to prepare three or more solutions separately, and capsules are often prepared using special equipment (Patent Documents 2 and 3).

[0004] As a simple means, encapsulated particles in which a colorant is encapsulated using cellulose or mannitol as a carrier are known as capsules that can be easily incorporated into an aqueous solvent containing a hydrophilic polymer as a thickener. These are hydrophilic particles, so they can be easily incorporated into an aqueous solvent, but the composition cannot be adjusted to the desired one because existing capsule particles are purchased as raw materials and incorporated. Alternatively, a technology has been reported that can stably maintain emulsion particles of a visible size by creating a shell of solid oil on the outside of the particles (Patent Document 4). In order to stably maintain the particles, it is necessary to add a water-soluble polymer to thicken the aqueous solvent.

[0005] As a technique for stably maintaining solid oil content, a method has been proposed in which a mixture of a specific polysaccharide and a higher alcohol with a melting point of 45°C or higher is added, dissolved, emulsified with a homogenizer at 70°C or higher, and then gradually cooled in this state, in which when the temperature of the emulsified solution becomes equal to or lower than the melting point of the higher alcohol, the oil droplets solidify, and a cosmetic in which oily particles are dispersed in a hydrophilic solvent is obtained. However, in this method, the particles are stirred at high speed (16,000 rpm to 13,000 rpm) with a homomixer, so that the particle size becomes small (Patent Document 5). In addition, a liquid crystal emulsion composition in which a higher alcohol that is solid at room temperature and a fatty acid are dispersed has also been proposed, but in order to obtain a composition with excellent temperature stability and usability, a surfactant is used in combination to reduce the size of the emulsion particles (Patent Document 6). Similarly, an oil-in-water emulsion cosmetic using a higher alcohol and a nonionic surfactant in combination has also been proposed, but the emulsion particles are very small, at 1 μm or less (Patent Document 7).

[0006] In the midst of this, a technique has been proposed for easily obtaining a solid lipid particle emulsion without using special equipment. This technique uses lipid components, which are phospholipids and higher alcohols, with triglycerides or wax esters added, as an oil phase, and when mixed with an aqueous phase under stirring, the phospholipids and higher alcohol form an interface, and a solid lipid particle emulsion containing triglycerides or wax esters as a core substance is easily obtained. However, when the obtained solid lipid particle emulsion with a particle size of about 100 to 500 μm was stored at 40° C. for one month, creaming of the solid lipid particle phase was observed (Patent Document 8).

[0007] In general, the larger the dispersed particles, the easier it is for the oily particles in the aqueous solvent to rise and sink, so we try to obtain particles as small as possible, as described above. That is, when considering the movement (settling) speed of particles in an aqueous solvent based on the Stokes equation, the larger the particle size, the faster the particle movement speed becomes, and the easier it is for the particles to rise and sink. This is the same when the particle size is 100 μm or more, and based on the Allen equation and Newton equation, the larger the particle size, the faster the particle movement speed becomes, and the easier it is for the particles to rise and sink (Non-Patent Document 1).

[0008] [Patent Document 1] JP 2013-018844 A [Patent Document 2] PCT / FR2009 / 052351 [Patent Document 3] PCT / EP2013 / 051976 [Patent Document 4] JP 2003-073230 A [Patent Document 5] JP 2007-238516 A [Patent Document 6] JP 2007-009199 A [Patent Document 7] JP 2010-053150 A [Patent Document 8] JP 2006-232731 A [Non-Patent Document 1] Koishi et al., Introduction to Dispersion Technology, Nikkan Kogyo Shimbun, p35-37, 1977 Summary of the Invention [Problem to be solved by the invention]

[0009] Compositions in which visible particles or capsules are dispersed in an aqueous solvent have attracted attention because of their special appearance. Products that focus on such appearance characteristics also need to be quickly adapted to trends and consumer needs. However, when special equipment is required for production, it is often difficult to introduce the equipment because of the large costs involved, and product development in a short period of time is difficult. In addition, when simple means are used, it is difficult to differentiate from other products. In addition, when attempting to form large particles and maintain them stably, as described above, the particles tend to float, settle, coalesce, and aggregate, so it is not possible to obtain a low-viscosity formulation by blending a water-soluble polymer to thicken the aqueous solvent, which may affect the feel when used. Therefore, the object of the present invention is to obtain a cosmetic in which visible particles are dispersed in an aqueous solvent by a simple combination of ingredients and through a simple process. [Means for solving the problem]

[0010] As a result of intensive research to solve the above problems, the present inventors discovered that by including a solid fat having a melting point of 40°C or higher as an oily component and including at least a polysaccharide represented by the repeating unit of the above general formula (1) as a hydrophilic polymer in an aqueous solvent, large oily particles can be formed in the aqueous solvent and maintained stably over a wide temperature range from high to low, and thus completed the oily particle-containing cosmetic of the present invention. That is, the present invention relates to the oily particle-containing cosmetic and its manufacturing method described below.

[0011] [1] An oily particle-containing cosmetic preparation comprising an oily component dispersed in an aqueous solvent as oily particles having an average particle size of 0.1 mm or more, the oily component comprising a solid fat (A) having a melting point of 40°C or higher, and the aqueous solvent comprising at least a polysaccharide represented by a repeating unit of the following general formula (1) as a hydrophilic polymer (B). [ka] [2] The oily particle-containing cosmetic preparation according to [1], wherein the solid fat (A) contains one or more components selected from the group consisting of higher alcohols having 16 or more carbon atoms and fatty acid esters. [3] The oily particle-containing cosmetic preparation according to [1], wherein the solid fat (A) is 5 to 50 mass % based on the total amount of the oily components. [4] A method for producing an oily particle-containing cosmetic according to any one of claims [1] to [3], comprising adjusting the temperature of the oily component to above its melting point, introducing the flowable oily component into an aqueous solvent adjusted to 40°C or higher, and cooling this mixture of the aqueous solvent and the oily component to 20 to 30°C to form oily particles having an average particle size of 0.1 mm or more in the aqueous solvent, thereby producing an oily particle-containing composition. Effect of the Invention

[0012] In the production of the oily particle-containing cosmetic of the present invention, by including a polysaccharide represented by the repeating unit of general formula (1) in the aqueous solvent, the oily particles can be maintained in a large size even in a heating process, and therefore an oily particle-containing cosmetic composition can be obtained by a simple combination of ingredients without using a special device. The oily particles contained in the cosmetic composition thus obtained are stably maintained in the aqueous solvent without coalescence, aggregation, floating, or settling even at high temperatures. In addition, since the stability can be maintained even if the content of the polysaccharide represented by the repeating unit of general formula (1) in the aqueous solvent of the composition is low, the feel of use as a cosmetic is not impaired. In such an oily particle-containing cosmetic, oily particles of a visible size are dispersed in the aqueous solvent, and by changing the color or size of the particles, it is possible to obtain an attractive product that can be visually different and attract the attention of consumers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The oily particle-containing cosmetic composition of the present invention and the method for producing the same will be described in detail below. The oily particle-containing cosmetic composition of the present invention comprises an "oil component" and an "aqueous solvent" for dispersing the particles.

[0014] The "oil component" is characterized by containing at least a solid fat (A) having a melting point of 40°C or higher as the oil component.

[0015] Examples of the solid fat (A) having a melting point of 40° C. or higher include hydrocarbons such as ceresin, paraffin, paraffin wax, microcrystalline wax, vaseline, and polyethylene wax; waxes such as beeswax, carnauba wax, candelilla wax, jojoba wax, lanolin, shellac wax, spermaceti, and shellac wax; fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid; higher alcohols such as lauryl alcohol, myristyl alcohol, cetanol, cetearyl alcohol, stearyl alcohol, arachidyl alcohol, and behenyl alcohol; and batyl alcohol and chimyl alcohol. Examples of the glyceryl ether include alkyl glyceryl ether, ceramides such as ceramide 1, ceramide 2, ceramide 3, ceramide 4, ceramide 5, ceramide 6I, ceramide 6II, ceramide 7, ceramide 8, ceramide 9, and ceramide 10, cholesterol, phytosterol, silicone waxes, sugar fatty acid esters such as dextrin myristate, dextrin palmitate, dextrin stearate, fructan and oligosaccharide stearate, and inulin stearate, glycerin fatty acid esters such as glyceryl behenate, glyceryl stearate, and glyceryl (behenic acid / eicosanedioic acid), as well as animal and vegetable oils and fats, and hardened oils of animal and vegetable oils and fats. One or more of these can be selected and used.

[0016] There are no particular limitations on the selection of solid fats, but when stability at high temperatures is required, a component having a melting point of 60°C or higher can be preferably used. On the other hand, in terms of ease of dissolution in the manufacturing process, a component having a melting point of less than 100°C can be preferably used. As such solid fats, one or more selected from the group consisting of higher alcohols and fatty acid esters having 16 or more carbon atoms can be selected and used. Examples of higher alcohols having 16 or more carbon atoms include cetearyl alcohol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, etc., and examples of fatty acid esters include alkyl glyceryl ethers such as batyl alcohol and chimyl alcohol, and glycerin fatty acid esters such as glyceryl monostearate and glyceryl (behenate / eicosanedioate).

[0017] The amount of solid fat in the "oil component" varies depending on the hardness required for the particles, but considering the balance between stability and disintegrability, it is preferably 5 to 50% by mass, more preferably 10 to 30% by mass. If the amount is less than 5% by mass, the particles become soft, which may cause concerns about stability. On the other hand, if it exceeds 50% by mass, it tends to be difficult to control disintegrability.

[0018] In addition to the solid fats mentioned above, the "oily component" may include liquid oils that are usually used in compositions such as cosmetics, or components that are poorly soluble in water. In the present invention, the liquid oil constituting the oily component is an oil component that is liquid at room temperature (25°C). The liquid oil forms oily particles together with the solid fat, making the oily particles easier to crush on the skin and improving skin compatibility. If only the solid fat is used, the oily particles will be hard and will not blend well with the skin, resulting in a poor feel when used.

[0019] Examples of liquid oils constituting the "oil component" of the present invention include silicone oils, hydrocarbons and fluorohydrocarbons, waxes, animal and vegetable oils, higher alcohols and polyhydric alcohols, fatty acids, fatty acid esters, organic acid esters, glycerides, and the like.

[0020] Examples of silicone oils include polyether-modified organopolysiloxanes such as dimethylpolysiloxane, ethylmethylpolysiloxane, diethylpolysiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, dimethylsiloxane-methyl(polyoxyethylene)siloxane copolymer, dimethylsiloxane-methyl(polyoxyethylene-polyoxypropylene)siloxane copolymer, dimethylsiloxane-alkoxy(C4-12)methylsiloxane copolymer, cyclic dimethylpolysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, and the like, fluoromethylsiloxane-dimethylsiloxane, and the like. These include fluorine-modified organopolysiloxanes such as fluorine-modified organopolysiloxanes such as fluoromethylsiloxane-polyoxyethylene methylsiloxane copolymers, fluoroalkyl-polyoxyalkylene-modified organopolysiloxanes such as fluoromethylsiloxane-polyoxyethylene methylsiloxane copolymers and fluoromethylmethylsiloxane-polyoxyethylene polyoxypropylene methylsiloxane copolymers, terminal- or side-chain-modified organopolysiloxanes such as dimethylpolysiloxane modified products in which hydroxyl groups have been introduced at the terminals and hydroxymethylsiloxane-dimethylpolysiloxane copolymers in which hydroxyl groups have been partially introduced at the side chains, and modified aminoorganopolysiloxanes such as dimethylaminobutylmethylsiloxane-dimethylsiloxane polymers having dialkylaminoalkyl groups on the side chains.

[0021] Hydrocarbons include squalane, squalene, liquid paraffin, pristane, polyisobutylene, etc., and a type of hydrocarbon includes fluorinated hydrocarbons such as perfluoropolyether, perfluorodecalin, perfluorooctane, etc. Animal oils include beef tallow, beef leg fat, beef bone fat, hardened beef tallow, turtle oil, lard, horse fat, mink oil, liver oil, egg yolk oil, and lanolin derivatives, and lanolin derivatives include liquid lanolin, reduced lanolin, lanolin acetate, lanolin fatty acid isopropyl, POE lanolin alcohol ether, POE lanolin alcohol acetate, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.Examples of higher alcohols include oleyl alcohol, 2-hexyldecanol, 2-octyldodecanol, isostearyl alcohol, hexyldodecanol, octyldodecanol, 2-decyltetradecinol, POE cholesterol ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, etc. Examples of polyhydric alcohols include anthracene diol, quinolinediol, glyoxime, glyceraldehyde, anthracenol, sedoheptitol, propanediol, inositol, usnic acid, urushiol, ursodeoxycholic acid, ethylboronic acid, diethanolamine, diethylpropanediol, diethylene glycol, diethoxypropanediol, cyclohexanediol, cyclohexanedione, cyclohexyl ether, etc. Examples of such glycols include xanthate, dihydroxyoctadecanoic acid, dihydroxycinnamic acid, dimethylcyclopentanediol, dimethylpropanediol, dimethylbenzenediol, tartaric acid amide, thioglycerin, triethylene glycol, nitropropylpropanediol, butanediol, butynediol, hexanediol, pentanediol, pentanetriol, pentanepentaol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, 1,3-butylene glycol, pentyl glycol, glycerin, pentaerythritol, threitol, arabitol, xylitol, ribitol, galactitol, sorbitol, mannitol, lactitol, maltitol, methanediol, methylbutanediol, monoacetin, and rhamnitol.Fatty acids include oleic acid, docosahexaenoic acid (DHA), isostearic acid, 12-hydroxystearic acid, and fatty acid esters include diisobutyl adipate, 2-hexyldecyl adipate, di-2-heptylundecyl adipate, N-alkyl glycol monoisostearate, isocetyl isostearate, trimethylolpropane triisostearate, ethylene glycol di-2-ethylhexanoate, cetyl 2-ethylhexanoate, trimethylolpropane tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, cetyl octanoate, octyldodecyl gum ester, oleyl oleate, octyldodecyl oleate, decyl oleate, neopentyl glycol dicaprate, triethyl citrate, cobalt stearate, and oleic acid. 2-ethylhexyl citrate, amyl acetate, ethyl acetate, butyl acetate, isocetyl stearate, butyl stearate, diisopropyl sebacate, di-2-ethylhexyl sebacate, cetyl lactate, myristyl lactate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, cholesteryl 12-hydroxystearate, dipentaerythritol fatty acid esters, isopropyl myristate, octyldodecyl myristate, 2-hexyldecyl myristate, myristyl myristate, hexyldecyl dimethyloctanoate, ethyl laurate, hexyl laurate, and the like, as well as the amino acid ester N-lauroyl-L-glutamic acid-2-octyldodecyl ester. Organic acid esters include isostearyl malate, diisostearyl malate, and the like, and glycerides include acetoglyceride, triisooctanoic acid glyceride, triisostearic acid glyceride, triisopalmitic acid glyceride, tri-2-ethylhexanoic acid glyceride, monostearic acid glyceride, di-2-heptylundecanoic acid glyceride, trimyristic acid glyceride, and the like.

[0022] The amount of liquid oil in the "oil component" varies depending on the type of oil and the hardness required for the particles, and is selected appropriately, but considering the balance between stability and disintegrability, it is preferably 5 to 95% by mass, more preferably 50 to 90% by mass. If the amount is less than 5% by mass, the particles will be hard and difficult to crush, and will not blend well with the skin. On the other hand, if it exceeds 95% by mass, the particles will be soft and it will be difficult to stably maintain large particles.

[0023] Furthermore, by adding lipophilic coloring components such as oil-soluble dyes (Red 225, Purple 201, etc.), organic pigments (Orange 204, Red 202, etc.), colorants (Orange 205, Yellow 4, Blue 1, etc.) lakes (with zirconium, barium, aluminum, etc.), natural pigments (chlorophyll, β-carotene, etc.), and hydrophobized inorganic pigments obtained by hydrophobizing the surface of inorganic pigment powders such as yellow iron oxide, red iron oxide, black iron oxide, titanium oxide, and zinc oxide, it is possible to color the oily particles to a desired color, and it is possible to impart visual appeal through color to the oily particle-containing cosmetic of the present invention. In addition, by adding an oil-soluble drug as an oily component, it is possible to impart the medicinal effects that such drugs should exhibit to the present oily particle-containing cosmetic, and it is possible to achieve sustained release of the drug and stability over time.

[0024] The "aqueous solvent" is characterized by containing at least a polysaccharide represented by a repeating unit of the following general formula (1) as the hydrophilic polymer (B). [ka] The polysaccharide of the above general formula (1) can be obtained, for example, as a product of Alcaligenes latus B-16 strain bacteria (FERM BP-2015). This polysaccharide is commercially available under the trade name Alcasealan (INCI name: Alcaligenes Polysacchaides, display name: Alcaligenes-produced polysaccharide, manufactured by Hakuto Co., Ltd.). By including the polysaccharide, it becomes possible to form the above-mentioned oily particles in a large size, and it becomes possible to disperse the oily particles in a uniform state in an aqueous solvent.

[0025] In order to form large oily particles in an aqueous solvent as in the present invention and maintain that state, it is necessary to stably maintain the particles at temperatures of 40°C or higher at which the particles are formed. Therefore, cosmetic compositions containing ordinary oily components form smaller emulsified particles in an aqueous solvent to prevent a separation state called creaming, in which the oily particles float or sink. Alternatively, a high concentration of hydrophilic polymer is added to the aqueous solvent to maintain a high viscosity and prevent creaming. However, if a high concentration of hydrophilic polymer is added to maintain a high viscosity even at high temperatures, the cosmetic spreads poorly and is difficult to apply evenly, and the stickiness during application and after drying becomes very strong, which is a problem. The hydrophilic polymer (B) of the present invention can maintain the network formed by the hydrophilic polymer even at high temperatures with a low blending amount.

[0026] The amount of the hydrophilic polymer (B) of the present invention is usually 0.01% by mass to 0.5% by mass, preferably 0.02% by mass to 0.3% by mass, and more preferably 0.05% by mass to 0.2% by mass, based on the total amount of the "aqueous solvent." If the amount of the hydrophilic polymer (B) is less than 0.01% by mass, sufficient dispersion stabilization effect cannot be obtained when heated, and large-sized oily particles may not be formed and maintained. On the other hand, if the amount of the hydrophilic polymer (B) is more than 0.5% by mass, the viscosity of the "aqueous solvent" becomes high, making it difficult to efficiently form oily particles.

[0027] Hydrophilic polymers other than the above-mentioned hydrophilic polymer (B) can be appropriately blended within a range that does not impair the effects of the present invention. For example, plant-based polymers such as tamarind, gum arabic, tragacanth, galactan, carob gum, guar gum, karaya gum, carrageenan, pectin, agar, algae colloid, fucoidan, trant gum, locust bean gum, and galactomannan, microbial polymers such as diutan gum, xanthan gum, sclerotium gum, curdlan, gellan gum, fucogel, dextran, succinoglucan, and pullulan, animal-based polymers such as chitosan, casein, albumin, and gelatin, starch-based polymers such as starch, carboxymethyl starch, and methylhydroxypropyl starch, methylcellulose, ethylcellulose, methylhydroxypropylcellulose, carboxymethylcellulose, ethylcellulose, methylhydroxypropylcellulose, ... Examples of such polymers include cellulose, hydroxymethylcellulose, hydroxypropylcellulose, nitrocellulose, sodium cellulose sulfate, sodium carboxymethylcellulose, crystalline cellulose, cellulose powder, and other cellulose-based polymers, sodium alginate, alginic acid-based polymers such as propylene glycol alginate, vinyl-based polymers such as polyvinyl methyl ether, carboxyvinyl polymer, and alkyl-modified carboxyvinyl polymer, polyoxyethylene-based polymers, polyoxyethylene-polyoxypropylene copolymer-based polymers, acrylic polymers such as sodium polyacrylate, polyethyl acrylate, and polyacrylamide, polyethyleneimine, and cationic polymers. One or more of these may be selected and used.

[0028] Furthermore, the "aqueous solvent" may contain, as a thickener, inorganic water-soluble clay minerals such as bentonite, hectorite, AlMg silicate (veegum), and laponite.

[0029] Furthermore, the "aqueous solvent" may contain, for example, general aqueous moisturizers such as glycerin, dipropylene glycol, 1,3-butylene glycol, and other aqueous solvents such as lower alcohols typified by ethanol. If necessary, other water-soluble components such as water-soluble drugs such as arbutin, ascorbic acid and its derivatives, and tranexamic acid and its derivatives may be added. Furthermore, water-soluble ultraviolet absorbers, chelating agents, pH adjusters, preservatives, dyes, fragrances, etc. may be added to the extent possible. The present invention does not limit the addition of these various additives within the scope of not interfering with the intended effect.

[0030] The method for producing the oily particle-containing cosmetic is to adjust the temperature to above the melting point of the "oil component", introduce the fluid oily particle-containing composition into an "aqueous solvent" adjusted to 40°C or higher, and cool the mixture of the "aqueous solvent" and the "oil component" to 20-30°C to form oily particles in the "aqueous solvent", thereby producing the oily particle-containing composition. The temperature of the "oil component" may be any temperature that exceeds its melting point, and is generally 50-100°C, more preferably 65-90°C. On the other hand, the temperature of the "aqueous solvent" may be any temperature that does not immediately solidify the introduced "oil component" before forming particles, and is specifically 40-95°C, more preferably 40-70°C.

[0031] When the "oil component" is introduced into the "aqueous solvent", an injection means such as a liquid transfer pump can be used. It is preferable to provide an injection port in the "aqueous solvent" and introduce the oil component, and it is more preferable to provide an injection port at the bottom of the "aqueous solvent". If such injection is performed from the top of the "aqueous solvent", the "oil component" is not introduced into the "aqueous solvent" and the oil component floats to the top of the "aqueous solvent", which may make it difficult to form oily particles. The tip inner diameter of the injection port (the inner diameter of the oil component discharge port) can be appropriately selected depending on the composition of the "oil component" and the desired size of the oily particles, and is not particularly limited. When a larger particle size, an average particle diameter of 0.5 mm or more, is desired, the tip inner diameter of the injection port is preferably 0.2 mm to 2 mm, and more preferably 0.4 to 1 mm. If the tip inner diameter of the injection port is small, the production efficiency may be poor, while if the tip inner diameter of the injection port is large, the variation in the oily particle size may be large.

[0032] During this introduction, it is preferable to introduce the "oil component" while stirring the "aqueous solvent". The stirring can be performed at a relatively low speed, generally 10 to 1500 rpm, more preferably about 20 to 500 rpm, using a propeller, paddle mixer, or the like, in order to form large particles that can be seen with the naked eye.

[0033] After the desired "oil component" is introduced, the cooling method is not particularly limited as long as the final temperature is 20 to 30° C. When the "oil component" cools to below its melting point, it solidifies and oil particles are formed in the "aqueous solvent."

[0034] The mass ratio of the "oil component" to the "aqueous solvent" in the oily particle-containing composition of the present invention can be freely selected depending on the desired product form, and is, for example, a mass ratio of "oil component":"aqueous solvent" of about 0.1:99.9 to 50:50, and preferably 1:99 to 40:60.

[0035] The size of the oily particles may be any size that is visible to the naked eye, and generally has an average particle diameter of 0.1 mm or more. The average particle diameter is preferably about 0.5 mm to 5 mm. If the average particle diameter is less than 0.1 mm, the product loses its visual appeal as the particles are visible to the naked eye. In the present invention, the "average particle diameter" is the average value when the particle diameters of 30 visible particles are measured by checking an image with a microscope as shown in FIG. 1.

[0036] The application mode of the oily particle-containing cosmetic of the present invention is not particularly limited, and the desired oily particle-containing cosmetic can be obtained by carefully selecting and blending the "oil component" and the "aqueous solvent" for dispersing the particles within a range that does not impair the effects of the present invention. Then, a cosmetic is provided in a form in which oily particles of a visible size are dispersed in an aqueous solvent. In addition, by using the produced composition of the present invention as an element to be added in the manufacturing process of a general cosmetic, a variety of formulations and forms of cosmetic can be provided.

[0037] The product form that the oily particle-containing cosmetic composition may take is not particularly limited, and it can be used, for example, as skin care products such as cleansing lotions, beauty serums, milky lotions, creams, and packs; makeup products such as makeup bases, foundations, blushers, lipsticks, and eye shadows; fragrances; or body compositions. EXAMPLES

[0038] The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these examples. Unless otherwise specified, the composition ratio is based on mass ratio (mass %).

[0039] [Examples 1 to 4, Comparative Examples 1 and 2: Creams as cosmetics containing oily particles] A cream, which is an oily particle-containing cosmetic composition having the composition shown in Table 1, was prepared by the following method. 1. Components 1 to 8 were heated to 80° C. and stirred at 8,000 rpm for 10 minutes in a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) to obtain an aqueous solvent. For Comparative Example 1, the pH was neutralized to 7 with 1% arginine (component 9), and the amount of the aqueous solvent was adjusted to 85 parts with purified water (component 8). 2. Ingredients 10 to 17 were heated to 80°C and mixed and stirred until homogenous to obtain an oily component. While stirring the aqueous solvent, which was kept at a temperature of 3.55°C or higher, at 250 rpm using a paddle mixer, the oily component melted at 80°C was injected into the aqueous solvent from the bottom of the container at a rate of 18 ml / min using a liquid delivery pump. A pipette tip with an inner diameter of 0.47 mm was used as the injection port. 4. After the injection was completed, stirring was stopped and the mixture was cooled to 20 to 30° C. to obtain the oily particle-containing cosmetics of Examples 1 to 4 and Comparative Examples 1 and 2.

[0040] <Average particle size> The average particle size was determined by checking the image with a microscope, reading the diameters of 30 representative visible particles from the scale, and calculating the average value, as shown in Figure 1. The sample was placed on a slide glass on 1 mm graph paper, and observed on the slide glass. The results are shown in Table 1.

[0041] <Stability over time> The appearance of each composition after preparation was visually confirmed, and then the composition was left to stand at 40° C. and 50° C. for 3 months, and visually confirmed for any changes in state. The stability was evaluated according to the following criteria. The results are shown in Table 1. Evaluation criteria for stability over time: ○: No change in appearance △: Some coalescence or creaming is observed. ×: Significant coalescence or creaming is observed

[0042] <Feel of use> Furthermore, the texture of each cosmetic preparation after preparation was evaluated based on the following criteria. The results are shown in Table 1. Evaluation criteria for usability: A panel of 10 people used the cream, which was a cosmetic product containing oily particles, after preparation. ◯: More than 7 out of 10 people felt that it had a moderate graininess, was easy to spread, and felt good to the touch. △: 4 to 6 out of 10 people felt that it had a moderate graininess, was easy to spread, and had a good feel when used. ×: Three or less out of 10 people felt that the product had a moderate graininess, was easy to spread, and had a good feel when used.

[0043] [Table 1] *1: Alcasealan (Hakutosha) *2: Hiviswako 103 (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) *3: PEMULEN TR-2 (manufactured by Lubrizol) *4: Behenyl alcohol 65 (manufactured by Nikko Chemicals) *5: Cetearyl alcohol (manufactured by Koyu Alcohol Kogyo Co., Ltd.) *6: Batyl alcohol 100 (manufactured by Nikko Chemicals) *7: NIKKOL MGS-F50V (manufactured by Nikko Chemicals)

[0044] In the cosmetic creams containing oily particles of Examples 1 to 4, particles with an average particle diameter of 0.8 mm or more were formed, and creams with moisturizing effects were obtained from the usage mode, but the appearance was significantly different from that of normal creams. The content of the oily component in the total amount of the cosmetic could be freely adjusted from 15 to 40 mass%. Furthermore, at 40°C and 50°C, the creams were evaluated as having excellent stability over 3 months, with a moderate particle feel, being easy to spread, and having a good feel when used. On the other hand, in the cosmetic creams containing oily particles of Comparative Examples 1 and 2, although coalescence was observed during particle formation at high temperatures, particles were partially formed. However, at 50°C, significant creaming was observed, resulting in a lack of stability over time.

[0045] [Example 5, Comparative Examples 3 and 4, Cosmetic Serums Containing Oily Particles] As shown below, an oily particle-containing composition having the composition shown in Table 2-1 was prepared, and then 95 parts of a beauty serum having the composition shown in Table 2-2 was stirred with a propeller (150 rpm) while adding 5 parts of the oily particle-containing composition to obtain a beauty serum that is an oily particle-containing cosmetic preparation. The average particle size, stability over time, and texture were evaluated in the same manner as for the above-mentioned cream, and the results are shown in Table 3. <Oily particle-containing composition> An oily particle-containing composition having the composition shown in Table 2-1 was prepared by the following method. 1. Components 1 to 8 were heated to 80° C. and stirred at 8,000 rpm for 10 minutes in a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) to obtain an aqueous solvent. 2. Ingredients 9 to 14 were heated to 80°C and mixed and stirred until homogenous to obtain an oily component. The aqueous solvent, which was kept at a temperature of 3.55°C or higher, was stirred at 300 rpm using a paddle mixer, while the oil component melted at 80°C was injected into the aqueous solvent from the bottom of the container at a rate of 18 ml / min using a liquid delivery pump. A pipette tip with an inner diameter of 0.47 mm was used as the injection port. 4. After the injection was completed, stirring was stopped and the mixture was cooled to 20 to 30° C. to obtain an oily particle-containing composition. <Beauty serum> A beauty essence having the composition shown in Table 2-2 was prepared in the following manner. 1. Components 1 to 4 and 7 were heated to 80° C. and stirred for 10 minutes at 8,000 rpm in a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) to obtain mixture 1. 2. Mixture 1 was cooled to 20-30°C with stirring, and component 5 was added with propeller stirring. 3. Next, while measuring the pH, component 6 was added until the pH became 6.5, thereby obtaining a beauty essence.

[0046] [Table 2-1] *8:KELTROL CG (manufactured by CP Kelco) *9:Quinizarin Blue (TCI) was dissolved in triethylhexanoin to a concentration of 1%. *10: BRNTONEGEL EUG (octyldodecanol, disteardimonium hectorite, propylene carbonate, manufactured by Elementis)

[0047] [Table 2-2]

[0048] [Table 3]

[0049] In the beauty essence of Example 5, colored particles with an average particle diameter of 0.8 mm were formed, and the beauty essence, which is an oily particle-containing cosmetic containing the particles, had excellent stability over 3 months at 40°C and 50°C. On the other hand, in the oily particle-containing composition of Comparative Example 3, although coalescence was observed during particle formation at high temperatures, particles were partially formed. However, the particles were added to the beauty essence and disintegrated when stirred. In the oily particle-containing composition of Comparative Example 4, the oily component floated to the top of the aqueous solvent during preparation, and oily particles could not be formed.

[0050] [Example 6, Lotion as a cosmetic preparation containing oily particles] An oily particle-containing composition having the composition shown in Table 4 was prepared in the same manner as the above-mentioned beauty serum, and then 10 parts of the oily particle-containing composition was added to 90 parts of a lotion having the composition shown in Table 4 while stirring with a propeller (250 rpm), to obtain a lotion that is an oily particle-containing cosmetic. The average particle size, stability over time, and texture evaluated in the same manner as the above-mentioned cream are shown in Table 4.

[0051] [Table 4] *11: Sudan III (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was dissolved in triethylhexanoin to a concentration of 0.1%.

[0052] In the case of the lotion of Example 6, colored particles with an average particle diameter of 1.5 mm were formed, and the lotion, which is an oily particle-containing cosmetic containing the particles, had excellent stability over 3 months at 40°C and 50°C. It was also confirmed that it was possible to incorporate ingredients that have a biochemical effect on the skin in the same way as Red No. 225, which was used as a coloring agent. Furthermore, despite being a lotion, it is also superior to ordinary lotions in that it forms a slight oily film.

[0053] [Example 7, Foundation as a cosmetic material containing oily particles] A foundation, which is an oily particle-containing cosmetic composition having the composition shown in Table 5, was prepared by the following method. The average particle size, stability over time, and texture were evaluated in the same manner as the above cream, and the results are shown in Table 5. 1. Components 1 to 6 were heated to 80° C. and stirred at 8,000 rpm for 10 minutes in a homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.) to obtain an aqueous solvent. 2. Components 7 to 13 were stirred in a dispersing mixer until homogenous to obtain mixture 2. 3. Mixture 2 and ingredients 14 to 18 were heated to 80°C and mixed and stirred until homogenous to obtain an oil component. While stirring the aqueous solvent, which was kept at a temperature of 4.55°C or higher, at 250 rpm using a paddle mixer, the oily component melted at 80°C was injected into the aqueous solvent from the bottom of the container at a rate of 10 ml / min using a liquid delivery pump. A pipette tip with an inner diameter of 0.75 mm, whose tip had been cut off, was used as the injection port. 5. After the injection was completed, stirring was stopped and the mixture was cooled to 20 to 30°C to obtain the oily particle-containing cosmetic preparation of Example 7.

[0054] [Example 8, Foundation as a cosmetic containing oily particles] A foundation, which is an oily particle-containing cosmetic composition having the composition shown in Table 5, was prepared in the same manner as in Example 7, except that the stirring speed of the paddle mixer was set to 150 rpm. The results of the evaluation of the average particle size, stability over time, and texture in use, which were evaluated in the same manner as the above-mentioned cream, are shown in Table 5. [Table 5]

[0055] For the foundation of Example 7, particles with an average particle size of 1.2 mm were formed (oil component content 12% by mass), and the foundation, which is an oily particle-containing cosmetic containing these particles, had excellent stability over 3 months at 40°C and 50°C. In addition, the foundation was evaluated as having a good texture, with a moderate granular feel, being easy to spread, and having a good texture. Furthermore, for the foundation of Example 8, even when the oil component content was 40% by mass, it also had excellent stability over 3 months at 40°C and 50°C. [Brief description of the drawings]

[0056] [Figure 1] Oil particles in a cosmetic material are shown under a microscope.

Claims

1. The oily particle-containing cosmetic preparation comprises an oily particle-containing composition in which an oily component is dispersed in an aqueous solvent as oily particles having an average particle diameter of 0.1 mm or more, the oily component comprising a solid fat (A) having a melting point of 40°C or more, and the aqueous solvent comprises at least a polysaccharide represented by a repeating unit of the following general formula (1) as a hydrophilic polymer (B). 【Chemistry 1】

2. 2. The oily particle-containing cosmetic preparation according to claim 1, comprising, as the solid fat (A), one or more components selected from the group consisting of higher alcohols having 16 or more carbon atoms and fatty acid esters.

3. 2. The oily particle-containing cosmetic according to claim 1, wherein the solid fat (A) is present in an amount of 5 to 50% by mass based on the total amount of the oily components.

4. The method for producing an oily particle-containing cosmetic according to any one of claims 1 to 3, comprising adjusting the temperature of the oily component to a temperature above its melting point, introducing the flowable oily component into an aqueous solvent adjusted to 40°C or higher, and cooling the mixture of the aqueous solvent and the oily component to 20 to 30°C to form oily particles having an average particle size of 0.1 mm or more in the aqueous solvent, thereby producing an oily particle-containing composition.

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