Oil-based cosmetics

Abstract

Provided is an oily cosmetic with which the precipitation of particles in a high-temperature environment can be reduced or suppressed while maintaining light spreadability at room temperature.　An oily cosmetic according to the present disclosure comprises: at least one selected from the group consisting of a polymer-based oil phase thickener and thickening particles; and particles having an average particle diameter of at least 50 μm, wherein the viscosity measured at 10 rpm by using a B-type viscometer in an atmosphere of 25ºC is at most 400,000 mPa∙s, and the viscosity measured at 10 rpm by using a B-type viscometer in an atmosphere of 90ºC is at least 2,000 mPa∙s.

Description

Technical Field

[0001] The present disclosure relates to oil-based cosmetics.

Background Art

[0002] In recent years, various oil-based cosmetics have been developed.

[0003] Patent Document 1 discloses an oil-based cosmetic containing (A) an oil agent containing two or more hydroxyl groups in the molecule, (B) a copolymer of an α-olefin having 18 or more carbon atoms and vinylpyrrolidone, and (C) a dextrin fatty acid ester, wherein the mass ratio (A) / (B) of the contents of components (A) and (B) is 1 to 20.

[0004] Patent Document 2 discloses an oil-based cosmetic containing wax, an oil agent other than wax, and anhydrous silicic acid having a particle size of 10 to 30 μm, wherein (A) one or more plant waxes account for 9.5 to 34% by mass based on the total amount of wax, (B) the total amount (b-1) of an oil agent having a viscosity of 5000 mPa·s or more at 20°C and a paste-like oil agent is 30 to 45% by mass based on the total amount of the oil-based cosmetic, and the cosmetic contains 20 to 40% by mass of a plant paste-like oil agent based on the total amount (b-1) of an oil agent having a viscosity of 5000 mPa·s or more at 20°C and a paste-like oil agent, and the mass ratio of the total amount (b-1) of an oil agent having a viscosity of 5000 mPa·s or more at 20°C and a paste-like oil agent to the total amount (b-2) of an oil agent other than wax that does not fall under (b-1) is (b-1):(b-2)=1:0.9 to 1:1.5, and (C) the anhydrous silicic acid having a particle size of 10 to 30 μm is 1 to 10% by mass based on the total amount of the oil-based cosmetic.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

[0006] Oil-based cosmetics sometimes contain relatively large particles, such as scrubbing agents. Since these large particles tend to settle, if an oil-based cosmetic containing such particles is left in a high-temperature environment during the summer, for example, on the dashboard of a car exposed to temperatures of around 90°C, the viscosity of the cosmetic decreases, causing the particles to settle and resulting in a deterioration of the cosmetic's quality.

[0007] To suppress the sedimentation of such particles, it was common practice to increase the viscosity of cosmetics by incorporating a high amount of thickeners such as dextrin fatty acid esters or oils such as waxes that are solid at room temperature. However, even if the viscosity of cosmetics could be increased by incorporating a high amount of such thickening ingredients and particle sedimentation could be suppressed in high-temperature environments, this would then result in a heavy, sluggish texture when spreading the cosmetics on the skin at room temperature.

[0008] Therefore, the subject of this disclosure is to provide an oily cosmetic composition that can reduce or suppress particle sedimentation in high-temperature environments while maintaining a light, easy-to-use texture at room temperature. [Means for solving the problem]

[0009] <Aspect 1> A material comprising at least one selected from the group consisting of polymer-based oil phase thickeners and thickening particles, and particles with an average particle diameter of 50 μm or more. Under a 25°C atmosphere, the viscosity measured using a Type B viscometer at 10 rpm is 400,000 mPa·s or less. The viscosity measured at 10 rpm using a Type B viscometer in a 90°C atmosphere is 2,000 mPa·s or higher. Oil-based cosmetics. <Aspect 2> The cosmetic composition according to Embodiment 1, wherein the polymer-based oil phase thickener is at least one copolymer selected from the group consisting of (styrene / isoprene) copolymer, (ethylene / propylene / styrene) copolymer, (styrene / butadiene) copolymer, (styrene / ethylene / butylene) copolymer, (styrene / propylene / butylene) copolymer, (styrene / butylene) copolymer, and (ethylene / propylene) copolymer. <Aspect 3> The cosmetic composition according to embodiment 1 or 2, wherein the thickening particles are at least one selected from the group consisting of fuzzy anhydrous silicic acid and organically modified clay minerals. <Aspect 4> The cosmetic composition according to any one of embodiments 1 to 3, wherein the particles with an average particle diameter of 50 μm or more are a scrubbing agent. <Aspect 5> The cosmetic composition according to any one of embodiments 1 to 4, wherein the content of particles with an average particle diameter of 50 μm or more is 1.0% by mass or more of the total amount of the cosmetic composition. <Pattern 6> The cosmetic composition according to any one of embodiments 1 to 5, wherein the content of the polymer-based oil phase thickener and the thickening components other than the thickening particles is 6.0% by mass or less with respect to the total amount of the cosmetic composition. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide an oily cosmetic composition that can reduce or suppress particle sedimentation in high-temperature environments while maintaining a light, easy-to-use texture at room temperature. [Brief explanation of the drawing]

[0011] [Figure 1] This graph shows the relationship between temperature and viscosity of a mixture of a polymer-based oil phase thickener (VERSAGEL™ ME2000) and thickening particles (dimethylsilylated silica), and dextrin palmitate, a type of dextrin fatty acid ester. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present disclosure will be described in detail. The present disclosure is not limited to the following embodiments and can be variously modified and implemented within the scope of the gist of the invention.

[0013] The oil-based cosmetic of the present disclosure (sometimes simply referred to as "cosmetic") contains at least one selected from the group consisting of a polymer-based oil-phase thickener and thickening particles, and particles having an average particle diameter of 50 μm or more, and has a configuration in which the viscosity measured at 10 rpm using a B-type viscometer in an atmosphere of 25°C is 400,000 mPa·s or less, and the viscosity measured at 10 rpm using a B-type viscometer in an atmosphere of 90°C is 2,000 mPa·s or more.

[0014] Although not limited by theory, it is considered that the principle by which such an oil-based cosmetic can suppress the sedimentation of particles in a high-temperature environment while maintaining easy usability with little elongation at normal temperature is as follows.

[0015] When thickening an oil-based cosmetic, generally, thickening components such as dextrin fatty acid ester and wax are used. Such thickening components exhibit a viscosity behavior in which the viscosity rapidly decreases as the temperature rises, as shown by the graph of dextrin palmitate in FIG. 1. On the other hand, the polymer-based oil-phase thickener and / or thickening particles used in the oil-based cosmetic of the present disclosure exhibit a viscosity behavior in which the viscosity gradually decreases as the temperature rises, as shown in FIG. 1. Although FIG. 1 shows the viscosity behavior when using a mixture of a polymer-based oil-phase thickener and thickening particles, the same viscosity behavior is shown when using a polymer-based oil-phase thickener or thickening particles alone.

[0016] The inventor focused on the fact that among the thickening components used in oil-based cosmetics, there are thickening components with different viscosity behaviors as the temperature rises.

[0017] That is, as shown in FIG. 1, thickening components such as dextrin fatty acid esters and waxes commonly used in oil-based cosmetics have a sharp decrease in viscosity when the temperature rises. As a result, when such thickening components are highly formulated in cosmetics to increase the viscosity to a target value, for example, to about 10 2 Pa·s at 70°C as shown in FIG. 1, the graph of dextrin palmitate in FIG. 1 is expected to rise overall in the vertical axis direction. Therefore, when such thickening components are used, even if sedimentation of particles in a high-temperature environment can be suppressed, it is considered that usability with little elongation at normal temperature cannot be achieved.

[0018] On the other hand, in the case of the polymer-based oil-phase thickener and / or thickening particles used in the oil-based cosmetics of the present disclosure, the difference in viscosity behavior at normal temperature and high temperature is smaller than that in the case of thickening components such as dextrin fatty acid esters and waxes. Therefore, it is not necessary to highly formulate them in cosmetics like such thickening components. As a result, it is considered that the oil-based cosmetics containing the polymer-based oil-phase thickener and / or thickening particles can reduce or suppress sedimentation of particles in a high-temperature environment while maintaining usability with little elongation at normal temperature.

[0019] The definitions of the terms in the present disclosure are as follows.

[0020] In the present disclosure, "high temperature" is intended to be 50°C or higher, 60°C or higher, 70°C or higher, 80°C or higher, or 90°C or higher. There is no particular limitation on the upper limit value, and for example, it can be intended to be 100°C or lower, less than 100°C, 95°C or lower, or 90°C or lower.

[0021] In the present disclosure, "normal temperature" is intended to be, for example, in the range of 20°C ± 15°C.

[0022] 《Oil-based cosmetics》 The oily cosmetic composition of this disclosure exhibits a viscosity of 400,000 mPa·s or less, measured at 10 rpm using a Type B viscometer in an atmosphere of 25°C. From the viewpoint of ease of use with good spreadability, such viscosity is preferably 350,000 mPa·s or less, 300,000 mPa·s or less, 250,000 mPa·s or less, 200,000 mPa·s or less, 150,000 mPa·s or less, or 100,000 mPa·s or less. There is no particular limit to the lower limit of such viscosity, and for example, it can be 5,000 mPa·s or more, 8,000 mPa·s or more, or 10,000 mPa·s or more.

[0023] The oily cosmetic composition of this disclosure exhibits a viscosity of 2,000 mPa·s or higher when measured at 10 rpm using a Type B viscometer in an atmosphere of 90°C. From the viewpoint of preventing sedimentation of particles in the cosmetic composition at high temperatures, such viscosity is preferably 2,500 mPa·s or higher, 3,000 mPa·s or higher, 3,500 mPa·s or higher, 4,000 mPa·s or higher, 4,500 mPa·s or higher, or 5,000 mPa·s or higher. There is no particular upper limit to such viscosity, and for example, it can be 60,000 mPa·s or less, 55,000 mPa·s or less, 50,000 mPa·s or less, 45,000 mPa·s or less, or 40,000 mPa·s or less.

[0024] In some embodiments, the oily cosmetic composition of this disclosure exhibits a viscosity of 2,500 mPa·s or higher, measured at 10 rpm using a Type B viscometer in an atmosphere of 70°C. From the viewpoint of preventing sedimentation of particles in the cosmetic composition at high temperatures, such viscosity is preferably 3,000 mPa·s or higher, 3,500 mPa·s or higher, 4,000 mPa·s or higher, 4,500 mPa·s or higher, 5,000 mPa·s or higher, 5,500 mPa·s or higher, 6,000 mPa·s or higher, 6,500 mPa·s or higher, or 7,000 mPa·s or higher. There are no particular restrictions on the upper limit of such viscosity; for example, it can be 200,000 mPa·s or less, 150,000 mPa·s or less, 100,000 mPa·s or less, 95,000 mPa·s or less, or 90,000 mPa·s or less.

[0025] In some embodiments, the oily cosmetic composition of this disclosure exhibits a viscosity of 3,500 mPa·s or higher, measured at 10 rpm using a Type B viscometer in an atmosphere of 60°C. From the viewpoint of preventing sedimentation of particles in the cosmetic composition at high temperatures, such viscosity is preferably 4,000 mPa·s or higher, 4,500 mPa·s or higher, 5,000 mPa·s or higher, 5,500 mPa·s or higher, 6,000 mPa·s or higher, 7,000 mPa·s or higher, 8,000 mPa·s or higher, 9,000 mPa·s or higher, or 10,000 mPa·s or higher. There is no particular upper limit to such viscosity, and for example, it can be 250,000 mPa·s or lower, 200,000 mPa·s or lower, 150,000 mPa·s or lower, or 100,000 mPa·s or lower.

[0026] The viscosity described above can be controlled, for example, by adjusting the amount of polymer-based oil phase thickeners and / or thickening particles added.

[0027] <Particles with an average particle diameter of 50 μm or more> The oily cosmetic composition of this disclosure contains particles with an average particle diameter of 50 μm or more. Particles of this size tend to settle when the viscosity of the cosmetic composition decreases in a high-temperature environment, but because the cosmetic composition of this disclosure contains a specific thickener, the settling of such particles in a high-temperature environment can be reduced or suppressed.

[0028] There are no particular restrictions on the range of the average particle diameter of such particles. For example, from the viewpoint of ease of elongation at room temperature, resistance to settling at high temperatures, and fully exhibiting the properties of the particles (e.g., scrubbing properties, cosmetic properties, etc.), it can be 60 μm or more, 80 μm or more, 100 μm or more, 120 μm or more, 150 μm or more, 170 μm or more, 200 μm or more, 220 μm or more, or 250 μm or more. There are no particular restrictions on the upper limit of the average particle diameter. For example, it can be 600 μm or less, 550 μm or less, 500 μm or less, 450 μm or less, 400 μm or less, 350 μm or less, or 300 μm or less. Here, "average particle diameter" in this disclosure can be determined as follows: A 6g sample of particles is placed on the top sieve (a standard sieve conforming to JIS K 8801-1, using a combination of sieves with mesh sizes from 2,000 to 75 μm) and classified for 5 minutes using a measuring instrument (RPS-85C, manufactured by Seishin Corporation). The weight of the sample remaining on each mesh size sieve is measured and plotted on normal probability paper. The average particle size is defined as the particle size at which the ratio of the cumulative weight to the total sample weight (6g) (cumulative weight %) is 50%.

[0029] There are no particular restrictions on the amount of particles with an average particle diameter of 50 μm or more that can be incorporated. For example, the amount of such particles can be 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, or 5.0% by mass or more, relative to the total amount of the cosmetic, from the viewpoint of ease of spread at room temperature, resistance to settling at high temperatures, and fully exhibiting the properties of the particles (e.g., scrubbing properties, cosmetic properties, etc.). There are no particular restrictions on the upper limit of the amount of such particles that can be incorporated, for example, 20% by mass or less, 15% by mass or less, 10% by mass or less, or 8.0% by mass or less.

[0030] There are no particular restrictions on the particles with an average particle diameter of 50 μm or more; for example, scrubbing agents and luminous pigments can be used. In particular, oil-based cosmetics containing scrubbing agents have become increasingly popular in recent years, and the oil-based cosmetic composition of this disclosure can suitably use scrubbing agents as particles with an average particle diameter of 50 μm or more. The scrubbing agent and the luminous pigment may be used individually or in combination.

[0031] (Scrubbing agent) There are no particular restrictions on the scrubbing agent, and examples include inorganic salts, crushed plant seeds, disintegrating particles granulated from high-molecular-weight compounds, sugars, crystalline cellulose, agar, konjac, and polyacrylates. Among these, it is preferable that the scrubbing agent be water-soluble, and from the viewpoint of low skin irritation and high safety (for example, no problems even if ingested), it is preferable to use a scrubbing agent composed of sugars (sometimes simply referred to as "sugar scrubbing agent"). Here, "water-soluble" in this disclosure means that the solubility in water at 20°C is at least 50 g / 100 mL, preferably 100 g / 100 mL or more, and more preferably 150 g / 100 mL or more. There are no particular restrictions on the upper limit of such solubility, but for example, it can be 500 g / 100 mL or less, 400 g / 100 mL or less, 300 g / 100 mL or less, or 200 g / 100 mL or less. The scrubbing agent can be used alone or in combination of two or more types.

[0032] Examples of inorganic salts include sodium chloride, sodium bicarbonate, sodium carbonate, calcium phosphate, sodium sulfate, sodium sesquicarbonate, magnesium chloride, magnesium oxide, magnesium carbonate, and calcium carbonate.

[0033] Examples of crushed plant seeds include walnut shells, walnut seeds, apricot seeds, and peach seeds.

[0034] Examples of polymer compounds that can be used for disintegrating particles include polyolefin resins such as polyethylene, polyester resins such as polyethylene terephthalate, and polyurethane resins.

[0035] Examples of sugars include monosaccharides, polysaccharides, and sugar alcohols.

[0036] Examples of monosaccharides include glucose, fructose, xylose, mannose, and galactose.

[0037] Examples of polysaccharides include sucrose, trehalose, lactose, maltose, and cellulose.

[0038] Examples of sugar alcohols include sorbitol, maltitol, xylitol, mannitol, lactitol, and erythritol.

[0039] Among sugars, at least one selected from the group consisting of fructose, sucrose, lactitol, xylitol, and sorbitol is preferred, with sucrose being particularly preferred.

[0040] (Luminous pigment) The luminous pigment may be colorless, white, or colored. The colorless, white, and colored luminous pigments may be used individually or in combination.

[0041] Examples of luminous pigments include titanium mica, iron oxide-coated titanium mica, carmine-coated titanium mica, carmine-ultramarine-coated titanium mica, iron oxide-carmine-treated titanium mica, ultramarine-treated titanium mica, iron oxide-ultramarine-treated titanium mica, chromium oxide-treated titanium mica, black titanium oxide-treated titanium mica, acrylic resin-coated aluminum powder, silica-coated aluminum powder, titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, titanium oxide-coated synthetic mica, titanium oxide-coated silica, titanium oxide-coated alumina, titanium oxide-coated glass powder, polyethylene terephthalate-polymethyl methacrylate laminated film powder, bismuth oxychloride, fish scale foil, iron oxide-coated titanium oxide mica such as red iron oxide-coated titanium oxide mica (mica coated with iron oxide and titanium oxide), and hollow titanium oxide powder with silica sandwiched between the mica and titanium oxide coating layers. These typically exhibit white or other colors.

[0042] As a colorless lustrous pigment, known transparent lustrous pigments can be used. For example, a lustrous pigment can be made by forming a coating on the surface of glass particles, which are composed of a high refractive index material such as titanium dioxide.

[0043] In this disclosure, "lustrous pigment" refers to a pigment that exhibits lustrous properties without including colorants. Furthermore, "colored lustrous pigment" refers to a lustrous pigment that exhibits a color other than colorless or white. Additionally, lustrous pigments typically take the form of flat plates, such as flakes or scales.

[0044] <Thickening agent> The oily cosmetic composition of this disclosure contains, as a thickening agent, at least one selected from the group consisting of polymer-based oil phase thickening agents and thickening particles. By using such a thickening agent, the viscosity of the cosmetic composition can be adjusted to the range described above.

[0045] (Polymer-based oil phase thickener) When using a polymer-based oil-phase thickener as a thickener, the thickener should be added appropriately so that the cosmetic composition exhibits the viscosity described above, and there are no particular restrictions on the amount added. For example, the amount of such thickener added can be 0.5% by mass or more, 1.0% by mass or more, 3.0% by mass or more, 5.0% by mass or more, 7.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more, relative to the total amount of the cosmetic composition, from the viewpoint of ease of spread at room temperature and resistance to settling at high temperatures. Alternatively, it can be 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 17% by mass or less, 15% by mass or less, 13% by mass or less, or 10% by mass or less.

[0046] There are no particular restrictions on the polymer-based oil phase thickener; for example, an agent containing a copolymer having at least one selected from the group consisting of ethylene monomer units and styrene monomer units can be used. Here, for example, in a copolymer having styrene monomer units (styrene segments), the styrene segments in the copolymer are attracted to each other in the oil phase, allowing a three-dimensional network structure to be formed between the copolymers, thereby thickening the oil phase.

[0047] Examples of such polymer-based oil phase thickeners include at least one selected from the group consisting of (styrene / isoprene) copolymer, (ethylene / propylene / styrene) copolymer, (styrene / butadiene) copolymer, (styrene / ethylene / butylene) copolymer, (styrene / propylene / butylene) copolymer, (styrene / butylene) copolymer, and (ethylene / propylene) copolymer. These copolymers may be hydrogenated. In particular, from the viewpoint of viscosity behavior such that viscosity decreases gradually with increasing temperature, at least one polymer-based oil phase thickener selected from the group consisting of hydrogenated (styrene / isoprene) copolymer, (ethylene / propylene / styrene) copolymer, (styrene / ethylene / butylene) copolymer, and (ethylene / propylene) copolymer is preferred.

[0048] (Thickening particles) When using thickening particles as a thickening agent, such thickening particles should be added appropriately so that the cosmetic composition exhibits the viscosity described above, and there are no particular restrictions on the amount added. For example, the amount of thickening particles added can be 0.5% by mass or more, 1.0% by mass or more, 3.0% by mass or more, 5.0% by mass or more, 7.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, or 30% by mass or more, relative to the total amount of the cosmetic composition, from the viewpoint of ease of spread at room temperature and resistance to settling at high temperatures. Alternatively, it can be 60% by mass or less, 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 17% by mass or less, 15% by mass or less, 13% by mass or less, or 10% by mass or less.

[0049] There are no particular restrictions on the thickening particles; for example, at least one selected from the group consisting of fuming anhydrous silicic acid and organically modified clay minerals can be used. The thickening particles may be subjected to hydrophobic treatment. Since the thickening particles can thicken the oil phase, they can also be called oil phase thickening particles.

[0050] Examples of organically modified clay minerals include water-swellable clay minerals treated with quaternary ammonium salts.

[0051] <Oil content> The oily cosmetic compositions of this disclosure typically contain oil.

[0052] There are no particular restrictions on the amount of oil that can be included. For example, it can be 30% or more by mass, 40% or more by mass, 50% or more by mass, or 60% or more by mass relative to the total amount of the cosmetic, and it can also be 95% or less by mass, 90% or less by mass, 85% or less by mass, 80% or less by mass, 75% or less by mass, or 70% or less by mass.

[0053] There are no particular restrictions on the oil content; for example, it may be animal oil, vegetable oil, or synthetic oil, and its properties may be, for example, semi-solid, liquid, or volatile. Specifically, examples include hydrocarbon oils, fats and oils, hydrogenated oils, fatty acids, higher alcohols, silicone oils, fluorinated oils, and polar oils. The oil content can be used alone or in combination of two or more types.

[0054] Examples of hydrocarbon oils include liquid paraffin, heavy liquid isoparaffin, α-olefin oligomer, squalane, petrolatum, polyisobutene, hydrogenated polyisobutene, polybutene, hydrogenated polybutene, polydecene, and hydrogenated polydecene.

[0055] Examples of oils and fats include olive oil, castor oil, jojoba oil, mink oil, and macadamia nut oil.

[0056] Examples of fatty acids include stearic acid, lauric acid, myristic acid, behenic acid, isostearic acid, and oleic acid.

[0057] Examples of higher alcohols include stearyl alcohol, cetyl alcohol, lauryl alcohol, oleyl alcohol, isostearyl alcohol, behenyl alcohol, and octyldodecanol.

[0058] Examples of silicones include low-molecular-weight dimethylpolysiloxane, high-molecular-weight dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, polyether-modified polysiloxane, polyoxyalkylene-alkylmethylpolysiloxane-methylpolysiloxane copolymer, alkoxy-modified polysiloxane, cross-linked organopolysiloxane, and fluorine-modified polysiloxane.

[0059] Examples of fluorinated oils include perfluorodecane, perfluorooctane, and perfluoropolyether.

[0060] Examples of polar oils include those with an IOB of 0.10 or higher, 0.15 or higher, 0.20 or higher, 0.22 or higher, or 0.24 or higher. There is no particular upper limit on the IOB, but it can be, for example, 0.50 or lower, 0.45 or lower, or 0.40 or lower. Here, the IOB value is an abbreviation for Inorganic / Organic Balance, and it is a value that represents the ratio of the inorganic value to the organic value, and serves as an indicator of the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. For each of the "inorganic value" and "organic value," for example, one carbon atom in a molecule has an "organic value" of 20, and one hydroxyl group has an "inorganic value" of 100. These values ​​are assigned according to the type of atom or functional group, and the IOB value of an organic compound can be calculated by summing the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound (see, for example, Yoshio Koda, "Organic Concept Diagram - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984).

[0061] Examples of such polar oils include neopentyl glycol dicaprate, glyceryl tri-2-ethylhexanoate, pentaerythrityl tetra-2-ethylhexanoate, glyceryl tri(caprylate / caprine), diethylhexyl sebacate, octyldodecanol, glyceryl diisostearate, diglyceryl triisostearate, diisostearyl malate, trimethylolpropane tri-2-ethylhexanoate, oxystearyl oxystearate, pentaerythrityl tetra(ethylhexanoate / benzoate), trioctanoin, pentaerythrityl tetraoctanoate, dipentaerythrityl hexahydroxystearate, castor oil, diisopropyl sebacate, pentaerythrityl tetraoctanoate, and trimethylolpropane triisostearate.

[0062] <Optional ingredients> The oily cosmetic composition of this disclosure may contain various other components in addition to the above-mentioned components, as long as they do not affect the effects of the present invention. Examples of such components include humectants, preservatives, defoamers, antioxidants, UV absorbers, polymers, surfactants, pharmaceuticals, alcohols, antibacterial agents, solvents, colorants, and fragrances. Any of these components may be used individually or in combination of two or more.

[0063] There are no particular restrictions on the UV absorbers used here. Examples of organic UV absorbers include ethylhexyl methoxycinnamate, octocrylene, polysilicone-15, t-butyl methoxydibenzoylmethane, ethylhexyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, homosalate, and ethylhexyl salicylate. UV absorbers can be used alone or in combination of two or more. Such organic UV absorbers may also be considered as oils.

[0064] Furthermore, in this disclosure, "colorant" means a material that does not exhibit luminescence but can produce color in cosmetics, and specifically, it can mean materials commonly referred to as inorganic pigments, organic pigments, or dyes.

[0065] There are no particular restrictions on the type of colorant used; it can be selected as appropriate, taking into consideration the aesthetic qualities when applied to cosmetics. Colorants can be used individually or in combination of two or more types.

[0066] Specifically, examples of inorganic pigments include inorganic red pigments (e.g., iron oxide (red iron), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, yellow ochre, etc.); inorganic black pigments (e.g., black iron oxide, lower titanium oxide, etc.); inorganic purple pigments (e.g., manganese violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.); inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); and metal powders (e.g., aluminum, gold, silver, copper, etc.).

[0067] Organic pigments include, for example, zirconium, barium, or aluminum lake, such as Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, Red No. 201, Red No. 202, Red No. 203, Red No. 204, Red No. 205, Red No. 206, Red No. 207, Red No. 208, Red No. 213, Red No. 214, Red No. 215, Red No. 218, Red No. 219, Red No. 220, Red No. 221, Red No. 223, Red No. 225, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 231, Red No. 232, Red No. Examples include color 401, red 404, red 405, red 501, red 502, red 503, red 504, red 505, red 506, orange 201, orange 205, orange 401, yellow 4, yellow 5, yellow 201, yellow 202, yellow 203, yellow 204, yellow 205, yellow 401, yellow 402, yellow 403 (1), yellow 404, yellow 405, yellow 406, yellow 407, blue 1, blue 404, green 3, green 201, green 202, green 204, and purple 201, etc.

[0068] Examples of natural pigments include β-carotene, cochineal pigment, red cabbage pigment, riboflavin, crocin, anthraquinone, canthaxanthin, and safflower pigment.

[0069] The oily cosmetic composition of this disclosure may contain thickening components other than polymer-based oil-phase thickeners and thickening particles. However, because these components may make the mixture heavy to spread at room temperature or cause particles in the cosmetic composition to settle easily at high temperatures, the amount of thickening components other than polymer-based oil-phase thickeners and thickening particles can be 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less, based on the total amount of the cosmetic composition. However, from the viewpoint of lightness of spread at room temperature and resistance to settling at high temperatures, it is preferable not to include thickening components other than polymer-based oil-phase thickeners and thickening particles in the cosmetic composition.

[0070] Herein, in this disclosure, "thickening component" refers to a component that does not contain hydrocarbon oils, fats and oils, hydrogenated oils, fatty acids, higher alcohols, silicone oils, fluorinated oils, and polar oils as described above, and which, when incorporated into a cosmetic composition, can increase the viscosity of the cosmetic composition at 25°C compared to the viscosity of the cosmetic composition at 25°C without any thickening components.Specific examples of thickening components include, for example, thickeners such as dextrin fatty acid esters (e.g., dextrin palmitate) and waxes.

[0071] Method for manufacturing oil-based cosmetics The method for manufacturing the oily cosmetic composition described herein is not particularly limited, and known manufacturing methods can be employed. An example of a method for manufacturing the oily cosmetic composition described herein is shown below.

[0072] An oily composition is prepared by kneading a raw material mixture for oily cosmetics, which includes at least one selected from the group consisting of polymer-based thickeners and thickening particles as described above, particles with an average particle diameter of 50 μm or more, oil, and optionally other components such as colorants, while heating it in a temperature range of 80 to 150°C. Here, the particles with an average particle diameter of 50 μm or more and the optional powder such as a colorant may be added to the mixture obtained by heating and mixing at least one selected from the group consisting of polymer-based thickeners and thickening particles and oil.

[0073] The prepared oily composition can be filled into a container while being heated in a temperature range of 80 to 150°C, and then cooled to room temperature (e.g., 0 to 30°C) to obtain the oily cosmetic composition of this disclosure.

[0074] The above-described oily composition, like the oily cosmetic composition of this disclosure, exhibits a viscosity of 2,000 mPa·s or higher when measured at 10 rpm using a Type B viscometer in an atmosphere of 90°C. Therefore, even when employing the above-described manufacturing method which requires heating to 80-150°C, the sedimentation of particles with an average particle diameter of 50 μm or more is reduced or suppressed, allowing such particles to be uniformly dispersed in the composition.

[0075] Forms and uses of oil-based cosmetics The oily cosmetic composition of this disclosure exhibits a viscosity of 400,000 mPa·s or less when measured at 10 rpm using a Type B viscometer in an atmosphere of 25°C, and can therefore be appropriately selected in the form of, for example, liquid, cream, gel, or paste.

[0076] There are no particular restrictions on the uses of the oily cosmetic composition disclosed herein. Examples include lip cosmetics such as lipstick, lip scrub, lip gloss, and lip balm; makeup cosmetics such as foundation and eyeshadow; and hair cosmetics such as hair stick and pomade. In particular, the oily cosmetic composition disclosed herein is preferably used as a lip cosmetic, and more preferably as a lip scrub containing a scrubbing agent. [Examples]

[0077] The present invention will be explained in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts of the ingredients are expressed in mass percent.

[0078] Examples 1-9 and Comparative Examples 1-13 The oily cosmetic compositions obtained using the formulations shown in Tables 1 and 2 and the manufacturing methods described below were evaluated as follows, and the results are shown in Tables 1 and 2.

[0079] <Evaluation Method> (Evaluation of viscosity) The viscosity of the cosmetic was evaluated at temperatures of 25°C, 60°C, 70°C, or 90°C using a Type B viscometer (TVB-10 viscometer, manufactured by Toki Sangyo Co., Ltd.). For viscosity measurements at each temperature, the rotor and rotation speed conditions listed in Tables 1 and 2 were adopted. If the viscosity was too low to measure, it is indicated as "Below Limit" in Tables 1 and 2.

[0080] (Evaluation of particle sedimentation: 1:45°C, 1 week) The sedimentation of particles (scrubbing agents) contained in oil-based cosmetics was visually observed immediately after preparation and after storage at 45°C for one week. The sedimentation properties of the particles were evaluated according to the following criteria. Here, an A rating is considered a pass, while B and C ratings are considered a fail: A: The particle sedimentation was 3 mm or less. B: Particle sedimentation was greater than 3 mm and less than or equal to 5 mm. C: Particle sedimentation was greater than 5 mm.

[0081] (Evaluation of particle sedimentation properties 2: 90℃) The prepared oil-based cosmetic was left at 90°C, equivalent to the temperature on a car dashboard in summer, for 30 minutes. The dispersion state of the particles (scrubbing agents) contained in the cosmetic was then visually observed, and the sedimentation properties of the particles were evaluated based on the following criteria. Here, an A rating is considered a pass, while B and C ratings are considered failures: A: The particles were uniformly dispersed within the cosmetic product. B: There were several areas where the particles were unevenly dispersed within the cosmetic product. C: The particles were clearly unevenly dispersed within the cosmetic product.

[0082] (Evaluation of usability: ease of spreading) A panel of 10 experts evaluated the feel of the cosmetics when applied to the lips in a 25°C environment. Here, a rating of A-B is considered a pass, and a rating of C is considered a fail. A: Nine to ten out of ten panel members responded that the stretch was too light. B: 5 to 8 out of 10 panelists responded that the stretch was too light. C: 0 to 4 out of 10 panelists responded that the stretch was too light.

[0083] <Method for manufacturing oil-based cosmetics> (Examples 1-9 and Comparative Examples 1-13) Using the formulations shown in Tables 1-2, oily cosmetic compositions of Examples 1-9 and Comparative Examples 1-13 were manufactured according to the methods described below.

[0084] All the materials were mixed, heated to 100°C to melt, and then dispersed in a homodisperser to prepare an oily composition.

[0085] This oily composition was filled into a glass container while being heated to 90°C, and then cooled to room temperature (approximately 25°C) to obtain an oily cosmetic.

[0086] [Table 1]

[0087] [Table 2]

[0088] <result> As is clear from the results in Tables 1 and 2, the cosmetic compositions of Examples 1 to 9, which contain polymer-based oil phase thickeners and / or thickening particles and exhibit a predetermined viscosity at 25°C and 90°C, were confirmed to reduce or suppress sedimentation of particles with an average particle diameter of 50 μm or more in high-temperature environments while maintaining easy spreadability at room temperature.

[0089] Furthermore, the results from Comparative Examples 12 and 13 showed that when using a general-purpose thickening agent conventionally used in oily cosmetics, the sedimentation of particles with an average particle diameter of 50 μm or more can be suppressed at a temperature of 45°C, and the smooth spreadability at room temperature can be maintained. However, the sedimentation of such particles cannot be suppressed at high temperatures of around 90°C.

Claims

1. It comprises at least one selected from the group consisting of polymer-based oil phase thickeners and thickening particles, and particles with an average particle diameter of 50 μm or more. The polymer-based oil phase thickener is at least one copolymer selected from the group consisting of (styrene / isoprene) copolymer, (ethylene / propylene / styrene) copolymer, (styrene / butadiene) copolymer, (styrene / ethylene / butylene) copolymer, (styrene / propylene / butylene) copolymer, (styrene / butylene) copolymer, and (ethylene / propylene) copolymer. The aforementioned thickening particles are fuzzy anhydrous silicic acid. The content of the polymer-based oil phase thickener and the thickening components other than the thickening particles is 4.0% by mass or less. Under a 25°C atmosphere, the viscosity measured at 10 rpm using a Type B viscometer is 400,000 mPa·s or less. Under a 90°C atmosphere, the viscosity measured at 10 rpm using a Type B viscometer is 2,000 mPa·s or higher. Oil-based cosmetics.

2. It comprises at least one selected from the group consisting of polymer-based oil phase thickeners and thickening particles, and particles with an average particle diameter of 50 μm or more. The polymer-based oil phase thickener is at least one copolymer selected from the group consisting of (styrene / isoprene) copolymer, (ethylene / propylene / styrene) copolymer, (styrene / butadiene) copolymer, (styrene / ethylene / butylene) copolymer, (styrene / propylene / butylene) copolymer, (styrene / butylene) copolymer, and (ethylene / propylene) copolymer. The aforementioned thickening particles are fuzzy anhydrous silicic acid. When the polymer-based oil phase thickener is included, the content of the polymer-based oil phase thickener is 20% by mass or more. The content of the polymer-based oil phase thickener and the thickening components other than the thickening particles is 6.0% by mass or less of the total amount of the cosmetic composition. Under a 25°C atmosphere, the viscosity measured at 10 rpm using a Type B viscometer is 400,000 mPa·s or less. Under a 90°C atmosphere, the viscosity measured at 10 rpm using a Type B viscometer is 2,000 mPa·s or higher. Oil-based cosmetics.

3. The cosmetic composition according to claim 1 or 2, wherein the particles with an average particle diameter of 50 μm or more are a scrubbing agent.

4. The cosmetic composition according to any one of claims 1 to 3, wherein the content of particles with an average particle diameter of 50 μm or more is 1.0% by mass or more of the total amount of the cosmetic composition.

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