Oil-based cosmetic

Abstract

Provided is an oil-based cosmetic which comprises a component that yellows due to photocatalytic activity and titanium oxide particles, and which is capable of suppressing or reducing yellowing that occurs in an environment where light is received.　This oil-based cosmetic comprises titanium oxide particles, a yellowing component, and lecithin.

Description

Oil-based cosmetics

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

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

[0003] Patent Document 1 discloses an oil-based cosmetic that contains (a) 50 to 99.2 mass % of an oil phase that is liquid at 25°C, (b) 0.6 to 3 mass % of silicic anhydride, and (c) 0.001 to 10 mass % of a pearling agent in the form of a laminated film powder, and that has a viscosity of 3,000 to 35,000 mPa s when measured at 30°C with a BL-type viscometer.

[0004] Patent Document 2 discloses an oil-based cosmetic comprising: (A) a composite powder having an average particle size of 0.5 to 10 μm, in which fine titanium oxide particles having an average primary particle size of 10 to 100 nm are dispersed in aluminum hydroxide and / or aluminum oxide, wherein the ratio of the mass of the fine titanium oxide particles to the mass of the composite powder is 30 to 40%, (B) a dialkyl phosphate polyvalent metal salt, and (C) a hydrocarbon oil.

[0005] JP 2009-263329 A JP 2008-222667 A

[0006] Oil-based cosmetics may contain particulate components such as glitter pigments or drugs such as vitamin E in order to impart a glittering texture such as a pearly finish.

[0007] Among the particle components, titanium dioxide-based particles (sometimes simply referred to as "titanium oxide-based particles") are known to exhibit photocatalytic activity. Some chemicals have been oxidized and turned yellow by the photocatalytic activity of titanium oxide-based particles. Therefore, oil-based cosmetics that contain both such yellowing chemicals and titanium oxide-based particles may change color over time in an environment exposed to light, potentially resulting in a deterioration in quality.

[0008] Therefore, a subject of the present disclosure is to provide an oil-based cosmetic that contains a component that turns yellow due to photocatalytic action and titanium oxide-based particles, and that can reduce or inhibit yellowing in an environment where it is exposed to light.

[0009] Aspect 1: An oil-based cosmetic comprising titanium oxide-based particles, a yellowing component, and lecithin. Aspect 2: The cosmetic according to Aspect 1, wherein the titanium oxide-based particles are titanium oxide-coated luster pigment particles. Aspect 3: The cosmetic according to Aspect 1 or 2, wherein the yellowing component is at least one selected from the group consisting of oil-soluble vitamins, hesperidin and its derivatives, saxifrage extract, and hawthorn extract. Aspect 4: The cosmetic according to any of Aspects 1 to 3, wherein the lecithin is soybean lecithin. Aspect 5: The cosmetic according to any of Aspects 1 to 4, further comprising at least one selected from the group consisting of polymer-based oil phase thickeners and thickening particles. Aspect 6: The cosmetic according to any of Aspects 1 to 5, wherein the mass ratio of the yellowing component to the lecithin is 10 or less. Aspect 7: The cosmetic according to any of Aspects 1 to 6, wherein the coloring material content is 0.5% by mass or less, based on the total amount of the cosmetic. <Aspect 8> A cosmetic product, in which the cosmetic material according to any one of aspects 1 to 7 is filled in a container having a transparent part through which the cosmetic material can be seen.

[0010] According to the present disclosure, it is possible to provide an oil-based cosmetic that contains a component that yellows due to photocatalytic action and titanium oxide-based particles, and that can reduce or inhibit yellowing in an environment exposed to light.

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the present invention.

[0012] The oil-based cosmetic composition of the present disclosure (sometimes simply referred to as "cosmetic composition") contains titanium oxide-based particles, a yellowing component, and lecithin.

[0013] Although not limited by the theory, the principle of action by which such oil-based cosmetics can reduce or suppress yellowing in an environment exposed to light is believed to be as follows: In the present disclosure, "yellowing in an environment exposed to light" and "the property of being able to reduce or suppress yellowing in an environment exposed to light" may sometimes be simply referred to as "yellowing" and "anti-yellowing."

[0014] When organic substances are subjected to the photocatalytic action of titanium oxide-based particles, they are typically oxidized and decomposed. In order to inhibit the decomposition of a specific organic substance from the photocatalytic action of titanium oxide-based particles, it is common practice to incorporate into a cosmetic a substance that is more susceptible to photocatalytic action than the organic substance, such as an antioxidant.

[0015] However, it has been found that while antioxidants used in the field of oil-based cosmetics, such as vitamin E, can prevent the oxidation of organic substances other than vitamin E, vitamin E itself turns yellow when it is oxidatively decomposed by photocatalysis.

[0016] The present inventors have found that when lecithin is blended into an oil-based cosmetic together with titanium oxide-based particles that exhibit photocatalytic activity, yellowing in an environment exposed to light can be reduced or inhibited, even if the cosmetic contains a component that yellows due to photocatalytic activity.The inventors believe that the effect of blending lecithin in reducing or inhibiting yellowing is as follows.

[0017] When lecithin is contained in an oil-based cosmetic, it is thought that this lecithin is oxidatively decomposed preferentially over components that yellow due to photocatalytic action (e.g., vitamin E), and therefore functions as an antioxidant, thereby reducing or inhibiting the oxidative decomposition of substances that tend to yellow due to photocatalytic action.Furthermore, because lecithin is a substance that is less likely to yellow than substances that tend to yellow, such as vitamin E, it is thought that it can reduce or inhibit the yellowing of oil-based cosmetics.

[0018] For example, vitamin E is a component that is generally used as an antioxidant in the field of oil-based cosmetics. When other antioxidants such as vitamin E are blended with lecithin in an oil-based cosmetic, the other antioxidants are thought to reduce or inhibit oxidation of other organic substances in the cosmetic due to actions other than photocatalysis (for example, thermal effects).

[0019] <Oil-Based Cosmetics> <Titanium Oxide-Based Particles> The oil-based cosmetic of the present disclosure contains titanium oxide-based particles. Such particles are not particularly limited as long as they are capable of exhibiting oxidative decomposition action associated with photocatalysis on organic substances in the oil-based cosmetic. Titanium oxide-based particles can be used alone or in combination of two or more types. Note that the titanium oxide-based particles of the present disclosure do not include particles that do not exhibit oxidative decomposition of organic substances associated with photocatalysis, for example, titanium oxide-based particles that have been subjected to a surface treatment that can prevent oxidative decomposition of organic substances associated with photocatalysis.

[0020] There are no particular restrictions on the amount of titanium oxide-based particles. For example, the amount of such particles can be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.5% by mass or more, 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 fully achieving the desired cosmetic properties (e.g., brilliance). There are no particular restrictions on the upper limit of the amount of such particles, and it can be, for example, 20% by mass or less, 15% by mass or less, 10% by mass or less, 8.0% by mass or less, or 5.0% by mass or less.

[0021] Examples of titanium oxide-based particles include glittering pigments (sometimes referred to as "pearl pigments") containing a titanium oxide component. Titanium oxide particles used in the cosmetic field as ultraviolet scattering agents or inorganic pigments, etc., also fall under the category of titanium oxide-based particles of the present disclosure if they exhibit oxidative decomposition of organic substances associated with photocatalysis, and can therefore be used as titanium oxide-based particles of the present disclosure. However, unlike glittering pigments, titanium oxide particles used in oil-based cosmetics as ultraviolet scattering agents or inorganic pigments are typically surface-treated to improve, for example, particle dispersibility. The coating layer formed by this surface treatment generally exhibits the ability to prevent oxidative decomposition of organic substances associated with photocatalysis, and therefore such particles are not included in the titanium oxide-based particles of the present disclosure.

[0022] (Brilliant pigment containing a titanium oxide component) The brilliant pigment containing a titanium oxide component may be colorless, white, or colored. The colorless, white, and colored brilliant pigments may be used alone or in combination.

[0023] Among such bright pigments, those coated with titanium oxide exhibit a photocatalytic effect across the entire surface of the pigment, and because the oil-based cosmetic composition of the present disclosure contains lecithin and has excellent yellowing resistance, such bright pigments coated with titanium oxide (sometimes referred to as "titanium oxide-coated bright pigments") can be advantageously used.

[0024] Examples of luster pigments containing titanium oxide include titanium mica (titanium dioxide-coated mica), iron oxide-coated mica, carmine-coated mica, carmine- and ferric iron oxide-coated mica, iron oxide- and carmine-treated mica, ferric iron oxide-treated mica, iron oxide- and ferric iron oxide-treated mica, chromium oxide-treated mica, black titanium oxide-treated mica, 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, iron oxide-coated mica such as red iron oxide-coated titanium oxide-coated mica, which is mica coated with iron oxide and titanium oxide, and hollow titanium oxide powder with silica sandwiched between the mica and titanium oxide coating layer. These are typically white or other colors.

[0025] As the colorless bright pigment, a known transparent bright pigment can be used, for example, a bright pigment having a glass particle substrate coated with a titanium oxide film on the surface thereof.

[0026] In this disclosure, the term "bright pigment" does not include colorants and refers to pigments that exhibit brightness. Furthermore, the term "colored bright pigment" refers to bright pigments that exhibit a color other than colorless or white. Bright pigments typically have a flat, flake-like or scaly form.

[0027] <Yellowing Component> The oil-based cosmetic composition of the present disclosure contains a yellowing component. The yellowing component may be used alone or in combination of two or more types. Here, in the present disclosure, the term "yellowing component" refers to a component that turns yellow when irradiated with ultraviolet light in a system in which the titanium oxide-based particles are present, for example, a component that turns yellow in Yellowing Test 1 described below.

[0028] There are no particular restrictions on the amount of the yellowing component. For example, from the viewpoint of fully exhibiting the performance (e.g., whitening effect) of the component, the amount of the yellowing component may be 0.01% by mass or more, 0.03% by mass or more, 0.05% by mass or more, 0.07% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, 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. There are no particular restrictions on the upper limit of the amount of the yellowing component, and it may be, for example, 20% by mass or less, 15% by mass or less, 10% by mass or less, 8.0% by mass or less, 5.0% by mass or less, or 3.0% by mass or less.

[0029] The yellowing component may include, for example, at least one selected from the group consisting of oil-soluble vitamins, hesperidin and its derivatives, saxifrage extract, and hawthorn extract.

[0030] (Oil-soluble Vitamins) In the present disclosure, the term "oil-soluble vitamins" refers to fat-soluble vitamins and their derivatives, as well as water-soluble vitamins whose properties have been changed to oil-solubility by derivatization. Here, examples of fat-soluble vitamins include vitamin D, vitamin E, vitamin K, and vitamin P. Examples of water-soluble vitamins whose properties have been changed to oil-solubility by derivatization include oil-soluble vitamin B derivatives and oil-soluble vitamin C derivatives.

[0031] Examples of vitamin D include ergocalciferol, cholecalciferol, and derivatives thereof.

[0032] Examples of vitamin E include tocopherol, tocotrienol, tocopherol acetate, and tocopherol nicotinate, as well as derivatives thereof.

[0033] Examples of vitamin K include phytonadione and menadione, and derivatives thereof.

[0034] In the present disclosure, vitamin P typically refers to a mixture of hesperidin and rutin, and does not include hesperidin alone or a hesperidin derivative alone.

[0035] Examples of oil-soluble vitamin B derivatives include pyridoxine trishexyldecanoate, pyridoxine dicaprylate, and pyridoxine dipalmitate.

[0036] Examples of oil-soluble vitamin C derivatives include ascorbyl palmitate, ascorbyl dipalmitate, ascorbyl tetrahexyldecanoate, ascorbyl stearate, methylsilanol ascorbate, trisodium ascorbyl palmitate phosphate, and disodium isostearyl ascorbyl phosphate.

[0037] These oil-soluble vitamins can be used alone or in combination of two or more. Among the oil-soluble vitamins, vitamins E and P can be preferably used. The yellowing resistance provided by lecithin in the oil-based cosmetic composition of the present disclosure works effectively on vitamins E and P.

[0038] (Hesperidin and its derivatives)

[0039] Hesperidin is a type of polyphenol found in large amounts in the peels of citrus fruits such as mandarins, and is a known component as a glycoside of hesperetin.

[0040] Hesperidin derivatives are also known compounds, being a type of polyphenol found in large amounts in the peels of citrus fruits such as mandarins. Examples of hesperidin derivatives include hesperetin, neohesperidin, hesperidin methyl chalcone, alkyl hesperidin, transglycosyl hesperidin, and hesperidin sulfate.

[0041] Alkyl hesperidin is a hesperidin derivative in which an alkyl group such as a methyl group or an ethyl group is added to hesperidin, and a specific example is methyl hesperidin.

[0042] Transglycosyl hesperidin is a hesperidin derivative in which a monosaccharide or oligosaccharide such as glucose, arabinose, galactose, rutinose, sophorose, or glucuronic acid has been transferred to a hydroxyl group of hesperidin. Specific examples include α-monoglucosyl hesperidin, α-diglucosyl hesperidin, α-triglucosyl hesperidin, α-tetraglucosyl hesperidin, and α-pentaglucosyl hesperidin.

[0043] Among hesperidin derivatives, α-monoglucosyl hesperidin, α-diglucosyl hesperidin, α-triglucosyl hesperidin, α-tetraglucosyl hesperidin, and α-pentaglucosyl hesperidin are preferred, with α-monoglucosyl hesperidin being more preferred. Hesperidin and its derivatives can be used alone or in combination of two or more.

[0044] <Lecithin> The oil-based cosmetic preparation of the present disclosure contains lecithin in order to reduce or inhibit yellowing of yellowing components that accompanies photocatalytic action.

[0045] The amount of lecithin to be blended can be appropriately set depending on the type and amount of yellowing component in the oil-based cosmetic, the degree of yellowing acceptable for the product, etc. For example, the mass ratio of the yellowing component to lecithin can be 10 or less, 9.0 or less, 8.0 or less, 7.0 or less, 6.0 or less, 5.0 or less, 4.5 or less, 4.0 or less, 3.5 or less, 3.0 or less, 2.5 or less, 2.0 or less, or 1.5 or less. There is no particular restriction on the lower limit of this mass ratio, but it can be, for example, 0.01 or more, 0.05 or more, 0.1 or more, 0.3 or more, 0.5 or more, 0.7 or more, or 1.0 or more.

[0046] The type of lecithin is not particularly limited, and examples thereof include vegetable lecithin and animal lecithin. Lecithin can be used alone or in combination of two or more types.

[0047] Vegetable lecithins include, for example, soybean lecithin, rapeseed lecithin, corn lecithin, and peanut lecithin.

[0048] An example of animal lecithin is egg yolk lecithin.

[0049] Lecithin that has been modified by a known method may be used. Examples of such lecithin include hydrogenated lecithin (hydrogenated lecithin), enzyme-treated lecithin obtained by enzymatically treating lecithin, such as lysolecithin, which is obtained by selectively losing one fatty acid molecule from lecithin, and hydroxylated lecithin, which has increased polarity by hydroxylating the unsaturated moieties of two acyl groups of lecithin.

[0050] Among lecithins, vegetable lecithin is preferred, soybean lecithin is more preferred, and these lecithins are preferably hydrogenated (hydrogenated) from the viewpoints of resistance to yellowing and safety when used in cosmetics.

[0051] <Oil> The oil-based cosmetic composition of the present disclosure typically contains oil.

[0052] The amount of oil to be blended is not particularly limited, and can be, for example, 30% by mass or more, 40% by mass or more, 50% by mass or more, or 60% by mass or more relative to the total amount of the cosmetic, and can be 98% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, or 70% by mass or less.

[0053] The oil is not particularly limited and may be, for example, an animal oil, a vegetable oil, or a synthetic oil, and may be, for example, solid, semi-solid, liquid, or volatile. Specific examples include hydrocarbon oils, oils and fats, waxes, hardened oils, fatty acids, higher alcohols, silicone oils, fluorine-based oils, oil-based gelling agents, and polar oils. The oils may be used alone or in combination of two or more.

[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 waxes include paraffin wax, ceresin wax, microcrystalline wax, polyethylene wax, montan wax, Fischer-Tropsch wax, carnauba wax, candelilla wax, Japan wax, beeswax, and gay wax.

[0057] Fatty acids include, for example, stearic acid, lauric acid, myristic acid, behenic acid, isostearic acid, and oleic acid.

[0058] Examples of higher alcohols include stearyl alcohol, cetyl alcohol, lauryl alcohol, oleyl alcohol, isostearyl alcohol, behenyl alcohol, and octyldodecanol.

[0059] Examples of silicones include low-polymerization dimethylpolysiloxane, high-polymerization dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, polyether-modified polysiloxane, polyoxyalkylene-alkylmethylpolysiloxane-methylpolysiloxane copolymer, alkoxy-modified polysiloxane, crosslinked organopolysiloxane, and fluorine-modified polysiloxane.

[0060] Examples of fluorine-based oils include perfluorodecane, perfluorooctane, and perfluoropolyether.

[0061] Examples of oily gelling agents include sucrose fatty acid esters, starch fatty acid esters, aluminum 12-hydroxystearate, and calcium stearate.

[0062] Examples of polar oils include polar oils having an IOB of 0.10 or more, 0.15 or more, 0.20 or more, 0.22 or more, or 0.24 or more. There are no particular restrictions on the upper limit of IOB, but it can be, for example, 0.50 or less, 0.45 or less, or 0.40 or less. Here, the IOB value is an abbreviation for Inorganic / Organic Balance (inorganic / organic ratio), and is a value representing the ratio of inorganic value to organic value, serving as an index indicating the degree of polarity of an organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. The "inorganic value" and "organic value" are set according to the type of atom or functional group, such as 20 for one carbon atom in a molecule and 100 for one hydroxyl group. The IOB value of an organic compound can be calculated by integrating the "inorganic values" and "organic values" of all atoms and functional groups in the organic compound (see, for example, "Organic Conceptual Diagram - Fundamentals and Applications" by Yoshio Koda, pp. 11-17, Sankyo Publishing, 1984).

[0063] Examples of such polar oils include neopentyl glycol dicaprate, glyceryl tri-2-ethylhexanoate, pentaerythrityl tetra-2-ethylhexanoate, glyceryl tri(caprylate / caprate), 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.

[0064] <Optional Components> In addition to the above-mentioned components, the oil-based cosmetic composition of the present disclosure can be appropriately blended with various other components as long as they do not affect the effects of the present invention. Examples of the various components include thickeners, moisturizers, preservatives, antifoaming agents, UV absorbers, scrubbing agents, oil-soluble polymers, surfactants, drugs, alcohols (e.g., polyhydric alcohols such as dipropylene glycol), antibacterial agents, solvents, coloring materials, and fragrances. The optional components can be used alone or in combination of two or more.

[0065] (Thickener) The thickener is preferably at least one selected from the group consisting of polymer-based oil phase thickeners and thickening particles. The use of such a thickener can contribute to the transparency of the oil-based cosmetic compared to other thickeners. Transparent oil-based cosmetic compositions allow light to penetrate into the cosmetic, and therefore are more susceptible to the photocatalytic action of titanium oxide-based particles than, for example, opaque oil-based cosmetic compositions, and the yellowing is more easily observed. The oil-based cosmetic compositions of the present disclosure can advantageously employ transparent oil-based cosmetic compositions because lecithin can reduce or inhibit the yellowing of yellowing components in an environment exposed to light.

[0066] a. Polymer-Based Oil Phase Thickener When a polymer-based oil phase thickener is used as a thickener, there are no particular restrictions on the amount thereof. For example, from the viewpoint of the usability of the cosmetic and the sedimentation resistance of the titanium oxide-based particles, the amount of the thickener may 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, and may 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.

[0067] The polymer-based oil phase thickener is not particularly limited, and a hydrocarbon polymer thickener, for example, an agent containing a copolymer having at least one selected from the group consisting of an ethylene monomer unit and a styrene monomer unit, can be used. Here, for example, in the case of a copolymer having a styrene monomer unit (styrene segment), the styrene segments in the copolymer are attracted to each other in the oil phase, and a three-dimensional network structure can be formed between the copolymers, thereby thickening the oil phase.

[0068] Specific examples of such polymer-based oil phase thickeners include at least one selected from the group consisting of (styrene / isoprene) copolymers, (ethylene / propylene / styrene) copolymers, (styrene / butadiene) copolymers, (styrene / ethylene / butylene) copolymers, (styrene / propylene / butylene) copolymers, (styrene / butylene) copolymers, and (ethylene / propylene) copolymers. These copolymers may be hydrogenated. Among these, from the viewpoints of the sedimentation resistance of titanium oxide-based particles and the transparency of oil-based cosmetics, at least one selected from the group consisting of hydrogenated (styrene / isoprene) copolymers, (ethylene / propylene / styrene) copolymers, (styrene / ethylene / butylene) copolymers, and (ethylene / propylene) copolymers is preferred.

[0069] b. Thickening Particles When thickening particles are used as a thickener, there are no particular restrictions on the amount of thickening particles used. For example, from the viewpoint of the usability of the cosmetic and the sedimentation resistance of the titanium oxide-based particles, the amount of thickening particles used may 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, and may 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.

[0070] The thickening particles are not particularly limited, and examples thereof include at least one selected from the group consisting of fumed silicic anhydride and organically modified clay minerals. The thickening particles may be subjected to a hydrophobic treatment. Since the thickening particles can thicken the oil phase, they can also be called oil phase thickening particles.

[0071] Examples of organically modified clay minerals include water-swellable clay minerals treated with quaternary ammonium salts.

[0072] (Coloring material) In the present disclosure, the term "coloring material" refers to a material that does not exhibit glitter and that can cause a cosmetic to develop color, and specifically refers to materials generally referred to as inorganic pigments, organic pigments, dyes, and colorants.

[0073] The type of coloring material is not particularly limited and can be appropriately selected in consideration of the cosmetic appearance when the cosmetic is applied, etc. The coloring materials can be used alone or in combination of two or more kinds.

[0074] Specific examples of inorganic pigments include inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, ochre, etc.); inorganic black pigments (e.g., black iron oxide, low-order 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.). The inorganic pigments may be surface-treated to improve dispersibility in oil-based cosmetics. Inorganic pigments such as titanium dioxide that have been surface-treated and, as a result, no longer exhibit photocatalytic activity are not included in the titanium oxide-based particles described above. The presence or absence of photocatalytic activity can be confirmed by Yellowing Test 1, which will be described later.

[0075] Examples of organic pigments include zirconium, barium, and aluminum lakes, such as Red 201, Red 202, Red 203, Red 204, Red 205, Red 206, Red 207, Red 208, Red 214, Red 215, Red 219, Red 220, Red 221, Red 228, Red 230, Red 231, Red 232, Red 404, Red 405, Red 502, Red 504, Red 505, Orange 201, Yellow 201, Yellow 205, Yellow 401, Yellow 402, Yellow 404, Yellow 405, Blue 404, and Green 202.

[0076] Examples of dyes include Red No. 223, Red No. 218; Red No. 225, Red No. 227; Red No. 503, Red No. 106; Red No. 213, Red No. 401; Red No. 501, Red No. 2, Red No. 3; Red No. 102, Red No. 104; Red No. 105, Red No. 226; Red No. 506; Orange No. 205, Orange No. 401; Yellow No. 4, Yellow No. 5; Yellow No. 203, Yellow No. 204; Yellow No. 202, Yellow No. 406; Yellow No. 403(1), Yellow No. 407; Blue No. 1, Green No. 3, Green No. 201; Green No. 204, and Purple No. 201.

[0077] Examples of natural pigments include β-carotene, cochineal pigment, red cabbage pigment, riboflavin, crocin, anthraquinone, canthaxanthin, and safflower pigment.

[0078] As described above, the oil-based cosmetic composition of the present disclosure can exhibit significant effects in terms of yellowing resistance when it is transparent, particularly when it is transparent and uncolored. Therefore, the oil-based cosmetic composition of the present disclosure preferably contains a colorant in an amount of 0.5% by mass or less, 0.3% by mass or less, 0.1% by mass or less, 0.05% by mass or less, or 0.01% by mass or less, relative to the total amount of the cosmetic composition, or it is more preferable that no colorant be contained in the cosmetic composition.

[0079] <<Method for producing oil-based cosmetic and cosmetic containing the cosmetic>> The method for producing the oil-based cosmetic of the present disclosure is not particularly limited, and known production methods can be used. An example of the method for producing the oil-based cosmetic of the present disclosure is shown below.

[0080] An oil-based composition is prepared by kneading the raw material mixture for an oil-based cosmetic containing the titanium oxide-based particles, yellowing component, lecithin, oil, and optional components such as a thickener as necessary, while heating in a temperature range of 80 to 150° C. Here, the powder such as titanium oxide-based particles may be added to a mixture in which components other than the powder have been mixed while being heated.

[0081] The prepared oily composition is filled into a container while being heated at a temperature range of 80 to 150°C, and then cooled to room temperature (e.g., 0 to 30°C), thereby obtaining a cosmetic product containing the oily cosmetic composition of the present disclosure.

[0082] <<Form and Use of Oil-Based Cosmetic>> The oil-based cosmetic of the present disclosure can be appropriately selected from the following forms: liquid, cream, gel, paste, or solid.

[0083] The uses of the oil-based cosmetic composition of the present disclosure are not particularly limited, and examples thereof include lip cosmetics such as lipstick, lip scrub, lip gloss, and lip balm; makeup cosmetics such as foundation and eye shadow; hair cosmetics such as hair stick and pomade, etc. Among these, the oil-based cosmetic composition of the present disclosure is preferably used as a lip cosmetic composition, more preferably as a lip scrub or lip gloss, and particularly preferably as a lip gloss.

[0084] Since the oil-based cosmetic preparation of the present disclosure can reduce or inhibit yellowing in an environment exposed to light, a container having a transparent portion through which the cosmetic preparation can be viewed can be used as a cosmetic container to fill with the cosmetic preparation. Such a container is not particularly limited as long as it has a transparent portion through which the cosmetic preparation can be viewed, and the entire container may be transparent, or only a portion of the container may be transparent.

[0085] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these. Unless otherwise specified, the blending amounts are expressed in mass %.

[0086] Test Examples 1 to 3 Evaluation Tests The following tests were carried out using test samples obtained by the manufacturing methods described below, and the results are summarized in Tables 1 to 3.

[0087] (Yellowing Test 1: Test for Confirmation of Yellowing Components) Test samples were filled into 50 ml transparent glass screw-top bottles, and then the glass surfaces of the screw-top bottles were placed 20 cm away from fluorescent lights and irradiated with light for 2 weeks in an environment of 25°C. After the test, the test samples were visually observed, and the state of yellowing was evaluated according to the following criteria. Here, among the components for which yellowing was confirmed, components that were evaluated as "yellowing" can be considered to be yellowing components: No change: No yellowing. Yellowing: Clear yellowing.

[0088] (Yellowing Test 2: Evaluation Test for Yellowing Resistance) Test samples were filled into 50 ml transparent glass screw-top bottles, and then the glass surfaces of the screw-top bottles were placed 20 cm away from fluorescent lights and irradiated with light for two weeks in an environment of 25°C. After the test, the test samples were visually observed, and the state of yellowing was evaluated according to the following criteria. Here, ratings A to B can be considered as passing, and rating C as failing: A: No yellowing occurred. B: Slight yellowing occurred. C: Clear yellowing occurred.

[0089] Test Example 1: Identification of yellowing components In Test Example 1, it was investigated whether yellowing components could be distinguished by the above-mentioned yellowing test 1. The results are shown in Table 1.

[0090] <Method of manufacturing oil-based cosmetic preparation for confirming yellowing components> (Reference Example 1) All of the materials listed in Table 1 were mixed, heated to 100°C to melt, and then dispersed using a homodisper to prepare an oil-based composition.

[0091] This oily composition was heated to 90°C and filled into a 50 ml transparent glass screw cap bottle, and then cooled to room temperature (approximately 25°C) to prepare a test sample. The filled oily composition was transparent except for the particles, but had a cloudy white color overall.

[0092] (Reference Examples 2 to 6) Test samples of Reference Examples 2 to 6 were prepared in the same manner as Reference Example 1, except for changing the formulation as shown in Table 1. In all test samples, the filled oily composition was transparent except for the particles, but had a milky white color overall, similar to Reference Example 1.

[0093]

[0094] <Results> From the results in Table 1, it was confirmed that by carrying out the above-mentioned Yellowing Test 1, it is possible to distinguish between components that yellow when exposed to photocatalytic action and components that do not yellow, among various active ingredients that can be blended into oil-based cosmetics.

[0095] Two types of titanium oxide-coated bright pigments were used as the titanium oxide-based particles, but the same results were obtained for both types of bright pigments. Therefore, in Yellowing Test 1, it was confirmed that any of the bright pigments listed in Table 1 can be used as titanium oxide-based particles for confirming yellowing components.

[0096] Test Example 2: Effect of adding lecithin on various yellowing components In Test Example 2, the effect of adding lecithin on various yellowing components was examined using the above-mentioned yellowing test 2. The results are shown in Table 2.

[0097] <Method of manufacturing oil-based cosmetic> (Example 1) All of the materials listed in Table 2 were mixed, heated to 100°C to melt, and then dispersed using a homodisper to prepare an oil-based composition.

[0098] This oily composition was heated to 90°C and filled into a 50 ml transparent glass screw cap bottle, and then cooled to room temperature (approximately 25°C) to prepare a test sample. The filled oily composition was transparent except for the particles, but had a cloudy white color overall.

[0099] (Examples 2 to 4 and Comparative Examples 1 to 4) Test samples of Examples 2 to 4 and Comparative Examples 1 to 4 were prepared in the same manner as in Example 1, except for changing the formulation as shown in Table 2. In all test samples, the oily composition filled was transparent except for the particles, but had a cloudy white color overall, similar to Example 1.

[0100]

[0101] <Results> From the results in Table 2, it was confirmed that when lecithin is added to an oil-based cosmetic composition containing a yellowing component, yellowing due to photocatalytic action can be reduced or inhibited.

[0102] Furthermore, since Yellowing Test 2 also corresponds to an accelerated test, it was inferred that the oil-based cosmetics of Examples 1 to 4, which obtained good results in this test, would have even better yellowing resistance under general lighting, for example, in a store or at home.

[0103] Test Example 3: Effects of ester oil (polar oil), mass ratio of yellowing component to lecithin, and polymer-based oil phase thickener In Test Example 3, the effects of ester oil (polar oil), mass ratio of yellowing component to lecithin, and polymer-based oil phase thickener in an oil-based cosmetic containing a yellowing component and lecithin were investigated using the above-mentioned Yellowing Test 2. The results are shown in Table 3.

[0104] <Method of Producing Oil-Based Cosmetic> (Example 5) All of the materials listed in Table 3 were mixed, heated to 100°C to melt, and then dispersed using a homodisper to prepare an oil-based composition.

[0105] This oily composition was heated to 90°C and filled into a 50 ml transparent glass screw cap bottle, and then cooled to room temperature (approximately 25°C) to prepare a test sample. The filled oily composition was transparent except for the particles, but had a cloudy white color overall.

[0106] (Examples 6 to 10) Test samples of Examples 6 to 10 were prepared in the same manner as in Example 5, except for changing the formulation as shown in Table 3. In all test samples, the oily composition filled was transparent except for the particles, but had a cloudy white color overall, similar to Example 5.

[0107]

[0108] <Results> The results of Examples 5 to 7 demonstrate that in oil-based cosmetics containing a yellowing component and lecithin, the use of an ester oil (polar oil) does not affect yellowing resistance.

[0109] From the results of Example 8, it was confirmed that the use of lecithin can improve the yellowing resistance of oil-based cosmetics even when the mass ratio of the yellowing component to the lecithin is equal to or greater than 1:1.

[0110] The results of Examples 5 to 10 show that the yellowing resistance of oil-based cosmetics can be improved by blending lecithin with any of the polymer-based oil phase thickeners.

Claims

1. An oil-based cosmetic containing titanium oxide-based particles, a yellowing component, and lecithin.

2. The cosmetic according to Claim 1, wherein the titanium oxide-based particles are titanium oxide-coated pearlescent pigment particles.

3. The cosmetic according to Claim 1 or 2, wherein the yellowing component is at least one selected from the group consisting of oil-soluble vitamins, hesperidin and its derivatives, arbutin extract, and hawthorn extract.

4. The cosmetic according to Claim 1 or 2, wherein the lecithin is soy lecithin.

5. The cosmetic according to Claim 1 or 2, further comprising at least one selected from the group consisting of a polymer-based oil-phase thickener and thickening particles.

6. The cosmetic according to Claim 1 or 2, wherein the mass ratio of the yellowing component to the lecithin is 10 or less.

7. The cosmetic according to Claim 1 or 2, wherein the content of the coloring material is 0.5% by mass or less based on the total amount of the cosmetic.

8. A cosmetic, wherein the cosmetic according to Claim 1 or 2 is filled in a container having a visible transparent part for the cosmetic.