Titanium dioxide particle dispersion and cosmetic containing the same

Abstract

To provide a non-silicone titanium dioxide particle dispersion, and also a non-silicone titanium dioxide particle dispersion that has a high concentration but offers excellent dispersibility and stability over time.SOLUTION: A titanium dioxide particle dispersion contains the following components (a)-(c): (a) a titanium dioxide particle surface-treated with fatty acid of 4.0-8.5 mass% relative to titanium dioxide; (b) a polyhydroxystearic acid; and (c) a non-silicone oil solution.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a titanium dioxide particle dispersion and a cosmetic containing the same.

Background Art

[0002] Conventionally, titanium dioxide particles and zinc oxide particles have high ultraviolet shielding properties and transparency, and thus have been used as ultraviolet scattering agents in sunscreen cosmetics and the like. Since the surfaces of these powders are hydrophilic in the untreated state, there is a risk of flowing away due to sweat, rain, etc. Therefore, particularly in applications such as cosmetics, it is often used after performing a water-repellent treatment on the particle surface. In general, since primary particles of fine inorganic powders tend to aggregate, it is widely practiced to use a dispersion obtained by dispersing the powder in a dispersion medium as a cosmetic raw material. In the cosmetics industry, since silicone oil has been mainly used as a dispersion medium in formulations, a dispersion obtained by subjecting the surface of fine inorganic powder to a silicone treatment and dispersing it in a silicone-based solvent has been often used.

[0003] However, silicone-based dispersants are designed to have a large molecular weight for dispersion stabilization, and there are problems in usability such as stickiness and poor spreadability. In recent years, non-silicone-based formulations have been increasing in the market. Therefore, in such dispersions as well, there has been a demand for non-silicone-based materials for both the water-repellent surface treatment agent and the dispersion medium of the inorganic powder.

[0004] In such a situation, a non-silicone dispersion of fine particle metal oxide surface-treated with trialkoxysilane has been proposed as a material using a non-silicone oil agent as a dispersion medium (Patent Document 1). Also, a non-silicone dispersion of fine particle metal oxide surface-treated with alkyl titanate has been proposed (Patent Document 2).

[0005] However, water-repellent surface treatment agents such as the above-mentioned trialkoxysilane and alkyl titanate are still not satisfactory in terms of cost and the like, and there is still room for improvement.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] In view of the above, an object of the present invention is to provide a non-silicone-based titanium dioxide particle dispersion. Another object of the present invention is to provide a non-silicone-based titanium dioxide particle dispersion that is excellent in dispersibility and stability over time even at a high concentration.

Means for Solving the Problems

[0008] The present invention is characterized by containing the following components (a) to (c): (a) Titanium dioxide particles surface-treated with 4.0 to 8.5% by mass of a fatty acid with respect to titanium dioxide (b) Polyhydroxystearic acid (c) A non-silicone-based oil agent and is a titanium dioxide particle dispersion.

[0009] It is preferable that the fatty acid in the above component (a) is at least one selected from the group consisting of stearic acid, myristic acid, and palmitic acid. It is preferable that the above component (a) is titanium dioxide particles surface-treated with one or two of aluminum hydroxide and hydrous silicic acid and further surface-treated with a fatty acid.

[0010] It is preferable that the non-silicone-based oil agent of the above component (c) is an ester oil or a fruit oil.

[0011] The present invention also relates to a cosmetic characterized by containing the above titanium dioxide particle dispersion.

Advantages of the Invention

[0012] According to the present invention, a non-silicone-based titanium dioxide particle dispersion can be provided. Further, the dispersion of the present invention is excellent in dispersibility and stability over time even at a high concentration.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, the present invention will be described in detail. The present invention relates to the following components (a) to (c): (a) Titanium dioxide particles surface-treated with 4.0 to 8.5% by mass of a fatty acid with respect to titanium dioxide (b) Polyhydroxystearic acid (c) A non-silicone-based oil agent and is a titanium dioxide particle dispersion characterized by containing them.

[0014] In producing the dispersion of the present invention, which is substantially composed of only non-silicone-based materials, by surface-treating titanium dioxide particles with a specific amount of a fatty acid, a non-silicone dispersion of fatty acid-treated titanium dioxide particles excellent in dispersibility and stability over time can be produced. Further, even when the titanium dioxide particles in the dispersion are at a relatively high concentration, they are excellent in dispersibility and stability over time. In particular, in addition to using a non-silicone-based oil agent, by using a fatty acid which is a natural-derived component, a non-silicone-based dispersion can be obtained. Therefore, the dispersion of the present invention is non-silicone-based and has high stability, and is suitable for use in cosmetics.

[0015] In the present invention, titanium dioxide particles are used as component (a). The titanium dioxide particles are preferable in that they have excellent transparency and excellent ultraviolet scattering performance.

[0016] The dispersion of the present invention contains titanium dioxide particles. The average primary particle diameter of the titanium dioxide particles is preferably 3 to 200 nm, more preferably 5 to 100 nm, and still more preferably 10 to 50 nm. Titanium dioxide particles having such a particle diameter have high visible light transmittance and a suitable ultraviolet shielding region. The average primary particle diameter of the titanium dioxide particles is calculated as the average value of the particle diameters of 200 particles randomly selected under an electron microscope.

[0017] The shape of the titanium dioxide particles is not particularly limited, and any shape such as spherical, rod-shaped, needle-shaped, spindle-shaped, plate-shaped, etc. can be used. For the above-mentioned average primary particle diameter in the case of a shape other than spherical, in the case of rod-shaped, needle-shaped, or spindle-shaped particles, it is defined as the average of the lengths on the short-axis side, and in the case of plate-shaped particles, it is defined as the average of the diagonal lengths of the surface. The major axis diameter / minor axis diameter (aspect ratio) of the titanium dioxide particles is preferably 9 or less. The aspect ratio of the titanium dioxide particles is calculated as the average value of the major axis diameter / minor axis diameter of 200 particles randomly selected under an electron microscope.

[0018] The crystal structure of the titanium dioxide particles is not particularly limited, and those such as anatase type, rutile type, brookite type, etc. can be used. From the viewpoint of suppressing photocatalytic activity, it is preferable to use rutile type ones.

[0019] Titanium dioxide particles can be produced by various known methods. As a method for producing titanium dioxide particles having a relatively small average primary particle diameter, for example, a method of neutralizing and hydrolyzing an aqueous solution of titanium tetrachloride with an alkali and firing the obtained hydrous titanium dioxide (this is also referred to as the "firing method" in the present invention), or a method of heat-treating the hydrous titanium dioxide obtained by neutralizing and hydrolyzing an aqueous solution of titanium tetrachloride with an alkali with sodium hydroxide and heat-aging the obtained reaction product with an acid (this is also referred to as the "wet method" in the present invention) can be used. Generally, spherical titanium dioxide particles can be obtained by the above firing method, and spindle-shaped titanium dioxide particles can be obtained by the above wet method. Also, rutile-type titanium dioxide particles can be obtained by both the firing method and the wet method. Further, the titanium dioxide particles obtained by the firing method have an aspect ratio of generally 3 or less, and preferably spherical particles having an aspect ratio of 1 to 2 can be obtained.

[0020] The titanium dioxide particles may contain various impurities that are inevitable in production. Examples of impurity elements include Al, Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Zn, Zr, Ag, Pb, Cl, Nb, and the like. Here, among the impurity elements, the content of lead (Pb) is preferably 3 ppm or less based on the mass of TiO2. The content of impurity elements including lead (Pb) is measured using an atomic absorption spectrophotometer. When the dispersion of the present invention is used in cosmetics, by making the lead content very small (3 ppm or less), the influence on the human body can be reduced. Further, it can also be suitably used in applications other than cosmetics when the dispersion of the present invention is used in such a way that it is released into the natural environment (for example, when used in disposable products such as abrasive compositions).

[0021] As a method for efficiently obtaining titanium dioxide particles having a lead (Pb) content within the above range, the above-described firing method or wet method using titanium tetrachloride as a starting material can be mentioned.

[0022] The titanium dioxide particles constituting component (a) of the present invention have a surface treatment layer with a fatty acid on the surface. As the water-repellent surface treatment agent, it is most desirable to use a fatty acid with high environmental adaptability. Here, the surface treatment is a water-repellent treatment for reducing the affinity between the surface of the titanium dioxide particles and water. Surface treatment with a material that is easily soluble in water or dispersed in water after the treatment does not fall within the scope of the "water-repellent treatment" of the present invention.

[0023] The fatty acid used in the present invention preferably has strong water repellency. A compound that forms some kind of chemical bond with the inorganic powder is preferred, but even a physically adsorbed compound can obtain a certain degree of effect. The above fatty acid is preferably a higher fatty acid having 10 to 30 carbon atoms because it can further improve the dispersibility of the titanium dioxide particles in the dispersion. Specifically, it is preferably at least one selected from saturated fatty acids such as stearic acid, myristic acid, lauric acid, and palmitic acid, and unsaturated fatty acids such as oleic acid. Among these, stearic acid, myristic acid, and palmitic acid are preferred from the viewpoints of being inexpensive, having high stability due to their simple structure, and having strong water repellency. In addition, in order to use a dispersant with a smaller environmental impact, it is preferable to use a plant-derived fatty acid.

[0024] The coating amount of the fatty acid is preferably such that the titanium dioxide particles can be uniformly coated. Specifically, it is necessary to be 4.0 to 8.5% by mass based on the titanium dioxide. By setting it within this range, the titanium dioxide particles can be uniformly coated, good water repellency can be imparted to the titanium dioxide particles, and sufficient dispersibility and stability over time in the dispersion can be ensured. Also, by preventing the coating amount from becoming excessive, it is possible to prevent excess fatty acid from being released, resulting in poor dispersibility or foaming in the dispersion. In addition, by setting it within the above range, it is presumed that there will be little increase in viscosity because there is little free fatty acid. The above lower limit is more preferably 4.5% by mass. The above upper limit is more preferably 8.0% by mass.

[0025] As a method for coating the surface of titanium dioxide particles with a fatty acid, for example, the fatty acid and titanium dioxide particles can be added and mixed in a solvent such as isopropyl alcohol or ethanol, and then dried and pulverized.

[0026] Moreover, the titanium dioxide particles used in the present invention are preferably those having their particle surfaces coated with other inorganic compounds. That is, component (a) is preferably titanium dioxide particles surface-treated with other inorganic compounds and further surface-treated with a fatty acid. Known inorganic surface treatment materials can be used as the coating material, for example, those coated with one or more of oxides or hydroxides such as Al, Si, Zr, or Sn. Previously, by surface-treating with these, the fatty acid becomes more likely to adhere to the surface of the titanium dioxide particles. Moreover, although the titanium dioxide particles have photocatalytic activity, the photocatalytic activity can be suppressed by coating with an inorganic compound. In such applications (for example, cosmetics, etc.), those coated with an inorganic compound are preferred.

[0027] In particular, it is preferable to use those surface-treated with one or two of aluminum hydroxide and hydrous silicic acid in terms of being harmless to the environment and the human body and having high activity suppression.

[0028] The coating amount of the above inorganic surface treatment material is preferably 1 to 30% by mass with respect to titanium dioxide. Within this range, sufficient activity suppression is achieved and the influence on the properties of titanium dioxide is small. The above lower limit is more preferably 3% by mass. The above upper limit is more preferably 20% by mass.

[0029] The surface treatment method with the above inorganic surface treatment material is not particularly limited and can be carried out by well-known general methods.

[0030] In the present invention, the above component (a) is preferably contained in a proportion of 40 to 60% by mass in the total amount of the dispersion. The effects of the present invention are particularly remarkable within such a blending amount range. The above lower limit is more preferably 42% by mass, and even more preferably 45% by mass.

[0031] In particular, in the present invention, even when the concentration of component (a) in the dispersion is relatively high at 45% by mass or more, the dispersibility is good, the viscosity of the dispersion is low, and the viscosity is maintained over time.

[0032] The dispersion of the present invention contains polyhydroxystearic acid as component (b). This compound functions as a dispersant, and it is preferable in that component (a) is well dispersed in a non-silicone-based oil agent by blending this. When polyhydroxystearic acid is used, good dispersion can be achieved even with a relatively small amount, and it is particularly preferable in that titanium dioxide particles having a water-repellent surface treatment layer are less likely to flow with water even when used as cosmetics or the like.

[0033] The hydroxyl group of hydroxystearic acid is preferably bonded to the 12th carbon, and the degree of polymerization of hydroxystearic acid is preferably 3 to 12, more preferably 4 to 8. Examples of commercially available products include Saracos HS-6C (manufactured by Nisshin Oillio Group, Ltd.), ARLACEL P-100 (manufactured by Uniqema), and the like.

[0034] The blending amount of the above polyhydroxystearic acid is preferably 0.1 to 10% by mass or less in the dispersion. The above lower limit is more preferably 1% by mass, and the above upper limit is more preferably 7% by mass or less. Such a ratio is particularly preferable in that the content of the solvent increases and the compatibility with the formulation during cosmetics blending is high.

[0035] The dispersion of the present invention contains a non-silicone oil as component (c). The non-silicone oil is a medium for dispersing component (a) and is an oil without a polysiloxane skeleton. A liquid oil that is liquid at normal temperature (15 to 25 °C) is preferable from the viewpoint of the dispersibility of component (a). For example, ester oils, fruit oils, and other fats and oils can be mentioned. Among them, ester oils and fruit oils are preferable in that they are easy to use when used in cosmetics. Specifically, the following can be mentioned, and one or more of them can be used.

[0036] Examples of the above ester oils include ethylhexyl palmitate, isopropyl isostearate, ethyl oleate, octyldodecyl oleate, octyldodecyl myristate, distearyl malate, glyceryl tricaprylate, isooctyl isononanoate, isotridecyl isononanoate, isononyl isononanoate, ethylhexyl isononanoate, propylene glycol dicaprylate, neopentylene glycol dicaprylate, neopentylene glycol diethylhexanoate, cetyl ethylhexanoate, glyceryl tri-2-ethylhexanoate, jojoba oil, isopropyl myristate, isopropyl palmitate, isotridecyl isononanoate, polyglyceryl diisostearate, diglyceryl triisostearate, glyceryl tribehenate, dipentaerythrityl hexa(hydroxystearate / stearate / rosinate), neopentyl glycol dioctanoate, cholesteryl isostearate, cholesteryl hydroxystearate, cholesteryl stearate, cholesteryl lanolin fatty acid, phytosteryl oleic fatty acid, N-lauroyl-L-glutamic acid di(cholesteryl·behenyl·octyldodecyl), N-lauroyl-L-glutamic acid di(phytosteryl·2-octyldodecyl), and the like.

[0037] Examples of the above fruit oils include olive fruit oil, aomoji fruit oil, ukyo fruit oil, caraway fruit oil, pepper fruit oil, coriander fruit oil, European plum fruit oil, vanilla fruit oil, bergamot fruit oil, lemon fruit oil, and the like.

[0038] Examples of the above-mentioned other fats and oils include safflower oil, soybean oil, evening primrose oil, grape seed oil, rose hip oil, coconut oil, almond oil, sesame oil, wheat germ oil, corn oil, cottonseed oil, avocado oil, camellia oil, persic oil, castor oil, peanut oil, hazelnut oil, macadamia nut oil, meadowfoam oil, cocoa butter, shea butter, candelilla wax, palm oil, palm kernel oil, beef tallow, horse fat, mink oil, milk fat, egg yolk oil, turtle oil, beeswax, camellia oil, and the like.

[0039] The blending amount of the above component (c) is preferably 5 to 60% by mass in the dispersion. By setting the ratio as described above, it is suitable in terms of being easily miscible with oil when blended into cosmetics and the like. The above lower limit is more preferably 10% by mass, and the above upper limit is more preferably 55% by mass.

[0040] In addition to the above components, preservatives, pH adjusters, pure water, etc. may be appropriately blended into the dispersion of the present invention according to the purpose.

[0041] The dispersion of the present invention preferably has an initial viscosity of 2500 mPa·s or less according to the following evaluation method. If it is within this range, the viscosity is low and bead separation after dispersion is easy. More preferably, it is 2400 mPa·s or less.

[0042] (Initial Viscosity Evaluation Method) Put 7 ml or more of the freshly prepared dispersion into a 9-ml screw bottle, use rotor No. 4 with a B-type viscometer (manufactured by Tokyo Keiki, TVB-10), rotate it at 60 rpm, and measure the viscosity (25 °C) 60 seconds after the start of rotation.

[0043] Moreover, the dispersion of the present invention preferably has a viscosity after 7 days of 5000 mPa·s or less according to the following evaluation method. If it is within this range, the viscosity is not high, and it is easy to take out from containers and the like, and the handling is good. More preferably, it is 4500 mPa·s or less.

[0044] (Method for Evaluating Viscosity over Time) Put 7 ml or more of the freshly prepared dispersion into a 9-ml screw bottle, store it in a constant-temperature bath at 40 °C for 7 days, use a B-type viscometer (manufactured by Tokyo Keiki, TVB-10), use rotor No. 4, rotate it at 60 rpm, and measure the viscosity (at 40 °C) 60 seconds after the start of rotation.

[0045] The dispersion of the present invention is not particularly limited in its production method. Specifically, for example, it can be obtained by using components (a) to (c) as raw materials and mixing and stirring them with other components.

[0046] The dispersion of the present invention is preferably an oil-based dispersion substantially free of water. Further, the content of components other than the above-described components (a) to (c) is preferably 1% by weight or less, and more preferably 0.5% by weight or less. Also, it may consist only of the above-described components (a) to (c). The dispersion of the present invention can be particularly used as a raw material for manufacturing cosmetics. Therefore, in order not to cause restrictions in formulation, it is preferable to contain as few components other than the above as possible.

[0047] The titanium dioxide particle dispersion of the present invention may contain inorganic particles other than titanium dioxide. The inorganic particles that can be used in combination are not particularly limited, and examples thereof include zinc oxide. In particular, when zinc oxide is used in combination with titanium dioxide, the problem of thickening is likely to become prominent. Therefore, when used in combination with zinc oxide, the effect of the present invention becomes more prominent. When titanium dioxide is used as an ultraviolet shielding agent in a sunscreen cosmetic, zinc oxide particles having a different ultraviolet shielding range may be used in combination. In such a case as well, the present invention is useful.

[0048] In the present invention, the zinc oxide particles used in combination are not particularly limited, but it is preferable to use zinc oxide particles surface-treated with a fatty acid. In addition, the coating amount of the fatty acid on the zinc oxide particles is preferably 2.3 to 4.0 mol% based on zinc oxide. Examples of the type of fatty acid include the same fatty acids as those used for zinc oxide. Also, similar to the titanium dioxide particles, those treated with aluminum hydroxide or hydrous silicic acid and then treated with a fatty acid are preferred.

[0049] The surface treatment of the zinc oxide particles can be carried out by the same method as the treatment of the above-described titanium dioxide particles.

[0050] It is preferable to use zinc oxide particles having an average primary particle diameter of 100 nm or less. When the particle diameter of the zinc oxide particles exceeds 100 nm, the hiding power is large, it becomes white, and the transparency is low. The lower limit of the average primary particle diameter of the zinc oxide particles is not particularly limited, but is usually 5 nm. The average primary particle diameter of the zinc oxide particles is the average value of 200 particle diameters converted from the specific surface area value measured by the BET method.

[0051] The primary particle diameter of the zinc oxide particles corresponds to the diameter of a sphere having the same surface area as the specific surface area determined by the BET method. That is, the particle diameter is a value obtained by the following calculation formula from the specific surface area: Sg measured by a fully automatic BET specific surface area measuring device Macsorb (manufactured by Mountech) and the true specific gravity: ρ of zinc oxide. Particle diameter (μm) = [6 / (Sg × ρ)] (Sg (m 2 / g): Specific surface area, ρ (g / cm 3 ): True specific gravity of the particles) Note that the true specific gravity: ρ of the particles is 5.6, which is the value of the true specific gravity of zinc oxide, and is used in the above calculation.

[0052] The shape of the zinc oxide particles is not particularly limited, and any shape such as spherical, rod-shaped, needle-shaped, spindle-shaped, and plate-shaped can be used. For the above-mentioned average primary particle diameter in the case of a shape other than spherical, in the case of rod-shaped, needle-shaped, and spindle-shaped particles, it is defined as the average of the lengths on the short axis side, and in the case of plate-shaped particles, it is defined as the average of the diagonal lengths of the surface. The major axis diameter / minor axis diameter (aspect ratio) of the zinc oxide particles is preferably 3 or less, more preferably 1 to 2. The aspect ratio of the zinc oxide particles is calculated as the average value of the major axis diameter / minor axis diameter of 200 particles randomly selected under an electron microscope.

[0053] When using inorganic particles other than titanium dioxide such as zinc oxide, the total amount of component (a) and inorganic particles other than titanium dioxide such as zinc oxide is preferably 40 to 70% by mass in the total amount of the titanium dioxide particle dispersion. Also, when using inorganic particles other than titanium dioxide such as zinc oxide, the inorganic particles may be blended within a range that does not inhibit the object of the present invention. For example, the blending amount of inorganic particles other than titanium dioxide such as zinc oxide is preferably 2 times or less the mass of titanium dioxide.

[0054] The dispersion of the present invention is preferably a non-silicone-based dispersion. Non-silicone-based means that it does not substantially contain silicone-based materials, and preferably does not substantially contain inorganic particles surface-treated with silicone-based oils, silicone-based surfactants, or silicone-based surface treatment agents.

[0055] The dispersion of the present invention is particularly preferably used as a cosmetic raw material. The cosmetics are not particularly limited, but can be blended into cosmetics for external use on the skin and hair, such as skin care products, hair products, makeup products, and ultraviolet protection products. Also, the form of the product is not particularly limited, and it can be applied to emulsion form, cream form, solid form, paste form, gel form, multilayer form, mousse form, spray form, etc.

[0056] For the cosmetics of the present invention, other raw materials of the dispersion of the present invention may be used in combination with any aqueous component and oily component that can be used in the cosmetic field. The above aqueous component and oily component are not particularly limited, and examples include oil components, surfactants, moisturizing agents, higher alcohols, sequestering agents, water-soluble natural and semi-synthetic and synthetic polymers, water-soluble and oil-soluble polymers, organic ultraviolet screening agents, various extracts, etc. Also, if necessary, as various powders, inorganic and organic pigments, various powders such as inorganic and organic clay minerals, inorganic and organic pigments treated with metal soaps or silicone, colorants such as organic dyes, and other drug components may include components such as preservatives, antioxidants, pigments, thickeners, emulsifying thickeners, pH adjusters, fragrances, cooling agents, antiperspirants, bactericides, skin activators, anti-inflammatory agents, whitening agents, film-forming agents, etc. Specifically, it is possible to arbitrarily blend one or more of the following listed compounding components and produce the target cosmetic by a conventional method. The blending amounts of these compounding components are not particularly limited as long as the effects of the present invention are not impaired. Also, within a range that does not inhibit the object of the present invention, inorganic powders of ultraviolet scattering agents such as zinc oxide and cerium oxide may be used. In addition, the cosmetic of the present invention can be formulated as a non-silicone type, or can be formulated to contain silicone-based materials such as silicone-based oil agents such as methyl silicone and methylphenyl silicone according to the purpose.

[0057] The above-mentioned oil is not particularly limited. For example, avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, eno oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, sinagiri oil, Japanese cedar oil, jojoba oil, germ oil, triglyceride, glyceryl trioctanoate, glyceryl triisopalmitate, cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, mutton fat, hydrogenated beef tallow, palm kernel oil, lard, beef bone fat, moru kernel oil, hydrogenated oil, beef foot fat, moru, hydrogenated castor oil, beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ibota wax, whale wax, montan wax, nuka wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, isopropyl lanolin fatty acid, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, polyethylene glycol lanolin fatty acid, POE hydrogenated lanolin alcohol ether, liquid paraffin, ozokerite, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, propylene glycol dicaprate, ethylhexyl palmitate, isotridecyl isononanoate, etc. can be mentioned.

[0058] The above-mentioned surfactant is not particularly limited. For example, lipophilic nonionic surfactants, hydrophilic nonionic surfactants, and other surfactants can be mentioned. The above-mentioned lipophilic nonionic surfactant is not particularly limited. For example, sorbitan fatty acid esters such as sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, diglycerol sorbitan penta-2-ethylhexanoate, diglycerol sorbitan tetra-2-ethylhexanoate; glycerin polyglycerin fatty acids such as monoricinoleic acid glycerin, sesquiolenic acid glycerin, monostearic acid glycerin, α,α'-oleic acid pyroglutamic acid glycerin, glycerin monostearate malic acid; propylene glycol fatty acid esters such as propylene glycol monostearate; hydrogenated castor oil derivatives; glycerin alkyl ethers, etc. can be mentioned.

[0059] The hydrophilic nonionic surfactant is not particularly limited. For example, POE sorbitan fatty acid esters such as POE sorbitan monooleate, POE sorbitan monostearate, and POE sorbitan tetraoleate (e.g., polysorbate 60), POE sorbitol fatty acid esters such as POE sorbitol monolaurate, POE sorbitol monooleate, POE sorbitol pentaoleate, and POE sorbitol monostearate, POE glycerin fatty acid esters such as POE glycerin monostearate, POE glycerin monoisostearate, and POE glycerin triisostearate, POE fatty acid esters such as POE monooleate, POE distearate, POE dioleate, and ethylene glycol distearate, POE alkyl ethers such as POE lauryl ether, POE oleyl ether, POE stearyl ether, POE behenyl ether, POE 2-octyldodecyl ether, and POE cholestanol ether, POE alkyl phenyl ethers such as POE octyl phenyl ether, POE nonyl phenyl ether, and POE dinonyl phenyl ether, Pluronic types such as Pluronic, POE·POP alkyl ethers such as POE·POP cetyl ether, POE·POP 2-decyltetradecyl ether, POE·POP monobutyl ether, POE·POP hydrogenated lanolin, and POE·POP glycerin ether, tetra-POE·tetra-POP ethylenediamine condensates such as Tetronic, POE castor oil, POE hydrogenated castor oil, POE hydrogenated castor oil monoisostearate, POE hydrogenated castor oil triisostearate, POE hydrogenated castor oil monopyroglutamic acid monoisostearic acid diester, POE castor oil hydrogenated castor oil derivatives such as POE castor oil maleic acid, POE honeybee wax·lanolin derivatives such as POE sorbitol beeswax, alkanolamides such as coconut fatty acid diethanolamide, lauric acid monoethanolamide, and fatty acid isopropanolamide, POE propylene glycol fatty acid ester, POE alkylamine, POE fatty acid amide, sucrose fatty acid ester, POE nonyl phenyl formaldehyde condensate, alkyl ethoxydimethylamine oxide, and trioleyl phosphate can be mentioned.

[0060] Examples of the other surfactants include anionic surfactants such as fatty acid soaps, higher alkyl sulfates, triethanolamine POE lauryl sulfate, and alkyl ether sulfates; cationic surfactants such as alkyltrimethylammonium salts, alkylpyridinium salts, alkyl quaternary ammonium salts, alkyldimethylbenzylammonium salts, POE alkylamines, alkylamine salts, and polyamine fatty acid derivatives; and amphoteric surfactants such as imidazoline-based amphoteric surfactants and betaine-based surfactants, which may be blended within a range where there are no problems with stability and skin irritation.

[0061] The humectant is not particularly limited, and examples thereof include xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucitin sulfate, calonic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO) PO adduct, extract of Rosa multiflora var. cathayensis, extract of Viola orientalis, and extract of Prunus mume.

[0062] The higher alcohol is not particularly limited, and examples thereof include linear alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, and cetostearyl alcohol; and branched-chain alcohols such as monostearyl glycerin ether (batyl alcohol), 2-decyltetradecynol, lanolin alcohol, cholesterol, phytosterol, hexyl dodecanol, isostearyl alcohol, and octyl dodecanol.

[0063] The sequestering agent is not particularly limited, and examples thereof include 1-hydroxyethane-1,1-diphosphonic acid, tetrasodium 1-hydroxyethane-1,1-diphosphonate, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, and edetic acid.

[0064] The above-mentioned natural water-soluble polymers are not particularly limited. For example, plant-based polymers such as gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), algocolloid (cassia extract), starch (rice, corn, potato, wheat), glycyrrhizic acid, etc.; microbial-based polymers such as xanthan gum, dextran, succinoglucan, pullulan, etc.; and animal-based polymers such as collagen, casein, albumin, gelatin, etc. can be mentioned.

[0065] The semi-synthetic water-soluble polymers are not particularly limited. For example, starch-based polymers such as carboxymethyl starch, methylhydroxypropyl starch, etc.; cellulose-based polymers such as methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, sodium carboxymethyl cellulose (CMC), crystalline cellulose, cellulose powder, etc.; alginic acid-based polymers such as sodium alginate, propylene glycol alginate, etc. can be mentioned.

[0066] The synthetic water-soluble polymers are not particularly limited. For example, vinyl-based polymers such as polyvinyl alcohol, polyvinyl methyl ether, polyvinyl pyrrolidone, etc.; polyoxyethylene-based polymers such as polyethylene glycol 20,000, 40,000, 60,000, etc.; polyoxyethylene polyoxypropylene copolymer-based polymers; acrylic-based polymers such as sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.; polyethyleneimine, cationic polymers, etc. can be mentioned.

[0067] The inorganic water-soluble polymers are not particularly limited. For example, bentonite, AlMg silicate (veegum), laponite, hectorite, silicic anhydride, etc. can be mentioned.

[0068] The organic UV absorber is not particularly limited. For example, benzoic acid-based UV absorbers such as para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester; anthranilic acid-based UV absorbers such as homomenthyl-N-acetylanthranilate; salicylic acid-based UV absorbers such as amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate; cinnamic acid-based UV absorbers such as ethylhexyl p-methoxycinnamate, octyl cinnamate, ethyl-4-isopropylcinnamate, methyl-2,5-diisopropylcinnamate, ethyl-2,4-diisopropylcinnamate, methyl-2,4-diisopropylcinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-diparamethoxycinnamate; benzophenone-based UV absorbers such as 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone;3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, urocanic acid, ethyl urocanate, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, etc. can be mentioned.;

[0069] The various extraction liquids are not particularly limited. For example, Saururus chinensis extract, Paeonia lactiflora extract, Prunella vulgaris extract, Viola philippica extract, Glycyrrhiza glabra extract, Paeonia suffruticosa extract, Saponaria officinalis extract, Luffa cylindrica extract, Cinchona ledgeriana extract, Saxifraga stolonifera extract, Clara extract, Coptis japonica extract, Wikstroemia indica extract, Primula sieboldii extract, Rosa multiflora extract, Dioscorea opposita extract, lemon extract, Citrus limon extract, aloe extract, Zingiber officinale root extract, Eucalyptus globulus extract, Stellaria media extract, Salvia officinalis extract, Thymus vulgaris extract, tea extract, seaweed extract, cucumber extract, cinnamon extract, strawberry extract, Melissa officinalis extract, carrot extract, Malus sieversii extract, peach extract, peach leaf extract, Morus alba extract, Lactuca indica extract, Hamamelis mollis extract, placenta extract, thymus extract, silk extract, licorice extract, etc. can be mentioned.

[0070] As the above various powders, there can be mentioned lustrous coloring pigments such as red iron oxide, yellow iron oxide, black iron oxide, mica titanium, iron oxide-coated mica titanium, titanium oxide-coated glass flakes, and inorganic powders such as mica, talc, kaolin, sericite, titanium dioxide, silica, and organic powders such as polyethylene powder, nylon powder, crosslinked polystyrene, cellulose powder, silicone powder, etc. Preferably, in order to improve functional properties and makeup persistence, part or all of the powder components may be subjected to a water-repellent treatment with substances such as silicones, fluorine compounds, metal soaps, oils, acylglutamic acid salts, etc. by a known method before use.

[0071] The other pharmaceutical components are not particularly limited. For example, vitamins such as vitamin A oil, retinol, retinol palmitate, inositol, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, DL-α-tocopherol nicotinate, magnesium ascorbyl phosphate, 2-O-α-D-glucopyranosyl-L-ascorbic acid, vitamin D2 (ergocalciferol), dl-α-tocopherol, dl-α-tocopherol acetate, pantothenic acid, biotin, etc.; hormones such as estradiol, ethinyl estradiol, etc.; amino acids such as arginine, aspartic acid, cystine, cysteine, methionine, serine, leucine, tryptophan, etc.; anti-inflammatory agents such as allantoin, azulene, etc., skin-whitening agents such as arbutin, etc.; astringents such as tannic acid, etc.; cooling agents such as L-menthol, camphor, etc., and sulfur, lysozyme chloride, pyridoxine chloride, etc. can be mentioned.

[0072] The manufacturing method of the cosmetic of the present invention is not particularly limited, and it may be manufactured by a manufacturing method according to the form of the cosmetic. Specifically, for example, the dispersion of the present invention can be obtained by mixing it with other components.

Examples

[0073] Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited by these examples. In the following description, unless otherwise specified, “%” and “parts” represent “mass %” and “parts by mass”.

[0074] (Production Examples 1 to 12) Surface-treated titanium dioxide particles having the composition shown in Table 1 were prepared by the following production method, and each powder was evaluated for “water repellency”, and the results are also shown in Table 1. The (mass %) of the fatty acid is a value based on titanium dioxide alone excluding Al.

[0075]

Table 1

[0076] (Manufacturing method) Mix Component 2 or 3 with three times the amount of isopropyl alcohol for each amount, and dissolve by stirring with a stirrer. Mix the solution of Component 2 or 3 and Component 1 well in a plastic bag, and heat-treat at 120 °C for 16 hours in a vent dryer. Grind the dried product with a coffee mill to obtain fatty acid-treated titanium dioxide.

[0077] (Evaluation method 1) Water repellency Put 50 mL of distilled water into a 100 mL beaker, float 1.0 g of fatty acid-treated titanium dioxide particles, stir 10 times with a spatula, visually observe the turbidity of the water, and judge according to the following evaluation criteria. 〇: No turbidity in water, transparent △: Water is slightly turbid, translucent ×: Water is cloudy white

[0078] As shown in Table 1, Production Examples 2 to 6 and 8 to 12 with a fatty acid content of 4.0% or more showed excellent water repellency, while Production Examples 1 and 7 with a fatty acid content of less than 4.0% had slightly turbid water, indicating insufficient water repellency.

[0079] (Examples 1 to 8 and Comparative Examples 1 to 9) Prepare fatty acid-treated titanium dioxide particle dispersions with the compositions shown in Tables 2 and 3 by the following manufacturing method, and evaluate each sample for "initial viscosity" and "viscosity over time", and the results are also shown in Tables 2 and 3.

[0080]

Table 2

[0081]

Table 3

[0082] (Manufacturing method) (Examples 1 to 4) 45 parts of fatty acid-treated titanium dioxide particles, 4 parts of polyhydroxystearic acid as component (a), 51 parts of a non-silicone oil agent as component (c), and 100 parts of φ0.5 mm zirconia beads were placed in a mayonnaise bottle, mixed, and then treated with a paint shaker (manufactured by Red Devil) for 30 minutes. Thereafter, by separating the beads, a fatty acid-treated titanium dioxide particle dispersion was obtained.

[0083] (Examples 5, 6, Comparative Examples 1 to 9) A fatty acid-treated titanium dioxide particle dispersion was obtained in the same manner as in Example 1, except that the blending amounts of the respective components were as shown in Table 2 or 3.

[0084] (Examples 7, 8) A dispersion of fatty acid-treated titanium dioxide particles and fatty acid-treated zinc oxide particles described later was obtained in the same manner as in Example 1, except that the blending amounts of the respective components were as shown in Table 2. (Manufacture of fatty acid-treated zinc oxide particles) 9 g of stearic acid (manufactured by Fujifilm Wako Pure Chemical Corporation) was mixed with 27 g of isopropyl alcohol and dissolved by stirring with a stirrer. The obtained solution and 100 g of zinc oxide (manufactured by Sakai Chemical Industry Co., Ltd., FINEX-40A, average primary particle size 27 nm, aluminum hydroxide 4.5%, hydrous silicic acid 4.5%) were thoroughly mixed in a plastic bag and heat-treated at 120 °C for 16 hours in a vent-type dryer. The dried product was pulverized with a coffee mill to obtain fatty acid-treated zinc oxide particles (fatty acid content 2.8 mol% based on zinc oxide).

[0085] (Evaluation Method 2) Initial Viscosity 7 ml of the freshly prepared dispersion was placed in a 9-ml screw bottle, and using a B-type viscometer (manufactured by Tokyo Keiki, TVB-10) with rotor No. 4, it was rotated at 60 rpm, and the viscosity (25 °C) 60 seconds after the start of rotation was measured.

[0086] (Evaluation Method 3) Viscosity over Time at 40 °C After dispersion, 7 ml of the freshly prepared dispersion was placed in a 9-ml screw bottle, stored in a 40 °C constant temperature bath for 7 days, and using a B-type viscometer (manufactured by Tokyo Keiki, TVB-10) with rotor No. 4, it was rotated at 60 rpm, and the viscosity (40 °C) 60 seconds after the start of rotation was measured.

[0087] From the results of the above Examples and Comparative Examples, the dispersion of the present invention had good dispersibility of the surface-treated titanium dioxide particles and was stable over time even when the concentration of the surface-treated fine titanium dioxide particles was high. On the other hand, the dispersion of the Comparative Example had surface-treated titanium dioxide particles that were not uniformly dispersed or aggregated over time compared to those of the Example, and was not suitable as a dispersion. In addition, some of the dispersions of the Comparative Examples had a high initial viscosity and a viscosity so high that beads could not be separated after dispersion. Or, some of them showed a significant increase in viscosity over time. [Industrial Applicability]

[0088] The dispersion of the present invention can be suitably used by being blended into cosmetics.

Claims

1. The following components (a) to (c): (a) Titanium dioxide particles surface-treated with 4.0 to 8.5% by mass of a fatty acid with respect to titanium dioxide (b) Polyhydroxystearic acid (c) A non-silicone oil A titanium dioxide particle dispersion characterized by containing the same.

2. The titanium dioxide particle dispersion according to Claim 1, wherein the fatty acid in the component (a) is at least one selected from the group consisting of stearic acid, myristic acid, and palmitic acid.

3. The titanium dioxide particle dispersion according to Claim 1 or 2, wherein the component (a) is titanium dioxide particles surface-treated with one or two of aluminum hydroxide and hydrous silicic acid and further surface-treated with a fatty acid.

4. The titanium dioxide particle dispersion according to any one of Claims 1 to 3, wherein the non-silicone oil of the component (c) is an ester oil or a fruit oil.

5. A cosmetic characterized by containing the titanium dioxide particle dispersion according to any one of Claims 1 to 4.

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