JP2012240995A - Zinc oxide dispersion and cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zinc oxide dispersion which does not cause such the problem that the dispersion easily thickens by formulation.SOLUTION: The zinc oxide dispersion is characterized in that particles obtained by subjecting zinc oxide particles having a coating layer composed of a silicon oxide formed on the surface of each particle to a treatment with silicone, are dispersed in a liquid silicone.

Description

The present invention relates to a zinc oxide dispersion and a cosmetic obtained by blending it.

Various inorganic powders such as zinc oxide and titanium oxide are prepared by preparing a base material containing liquid silicone and a dispersant, and blending such a dispersion as a raw material for preparing the cosmetic material. (Patent Documents 1 and 2). Thus, a zinc oxide dispersion having a stable and high dispersion stability can be obtained, and thus a cosmetic that is transparent and has a natural finish can be provided.

In the cosmetic field, zinc oxide particles are used as an ultraviolet shielding agent and are a widely used raw material in many cosmetics. As such zinc oxide particles, those coated with a surface for the purpose of suppressing surface activity are widely used (Patent Document 3).

When such zinc oxide particles are blended with a substrate containing liquid silicone and a dispersant, depending on the formulation, it is difficult to control the viscosity, which may cause a problem in formulation. In particular, when used in combination with titanium oxide, which is often used in sunscreens, the problem of thickening is likely to occur, and the formulation design is difficult, so the viscosity is higher among zinc oxide dispersion and titanium oxide dispersion. It is preferable that the viscosity of the one does not become lower than the viscosity when mixed. There has been no investigation for improving such a problem of thickening, and improvement has been demanded.

Patent Documents 4 and 5 disclose cosmetic compositions in which zinc oxide having a specific coating and a specific surfactant are used in combination. However, the compositions described in these are prepared using powdered zinc oxide, and there is no description of preparing a dispersion in which zinc oxide is dispersed in a liquid medium.

Japanese Patent Laid-Open No. 2004-83451 Japanese Patent Laid-Open No. 2004-2877 Japanese Patent Laid-Open No. 11-302015 JP 2001-58934 A JP 2002-60329 A

An object of this invention is to provide the zinc oxide dispersion which does not produce the problem that it is easy to produce a viscosity increase by prescription in view of the above. In particular, the conventional zinc oxide dispersion has a problem of thickening when mixed with a titanium oxide silicone dispersion. The present invention is intended to solve such problems.

As a result of investigating the mechanism of thickening when mixing a titanium oxide silicone dispersion and a zinc oxide silicone dispersion, the inventors have found that it is not caused by a chemical reaction.

The present invention relates to a zinc oxide dispersion characterized in that particles obtained by subjecting zinc oxide particles having a silicon oxide coating layer formed thereon to silicone treatment are dispersed in liquid silicone. is there.

The zinc oxide dispersion is preferably one using particles whose zeta potential measured in isopropanol dispersion is −90 mV or less.
The coating layer made of the silicon oxide is preferably 2 to 50% by weight with respect to the weight of the zinc oxide on which the coating layer is formed and subjected to the silicone treatment.
The zinc oxide dispersion preferably further contains a silicone-based dispersant.
The zinc oxide dispersion may further contain titanium oxide particles.
The titanium oxide particles are preferably those subjected to alumina and / or aluminum hydroxide treatment and silicone treatment.

The present invention is also a cosmetic obtained by blending the above-described zinc oxide dispersion.

According to the present invention, a zinc oxide dispersion that does not cause thickening can be provided. Thereby, a cosmetic containing zinc oxide can be obtained without causing the problem of thickening. Moreover, the present inventors discovered that the thickening can be suppressed by treating the surface of the zinc oxide particles with silicon oxide and adjusting the surface potential, and completed the present invention.

The present invention is a zinc oxide dispersion in which particles obtained by applying silicone treatment to zinc oxide particles having a coating layer made of silicon oxide on the surface are dispersed in silicone oil. That is, zinc oxide is dispersed in silicone oil as a liquid medium. Such a zinc oxide dispersion can be prepared as a dispersion, and then mixed with water or other ingredients of cosmetics to prepare a cosmetic.

Zinc oxide that can be used as a raw material is not particularly limited, and zinc oxide produced by a known method such as the French method or the American method can be used. In particular, zinc oxide produced by the French method can be used. Is preferable from the viewpoint of few impurities. In addition, zinc oxide obtained by a precursor method in which carbonate or the like is heated and fired is more preferable in terms of fine particles.

The zinc oxide particles used in the present invention are obtained by changing the surface potential by forming a coating layer made of silicon oxide on the surface. The coating layer is made of silicon oxide in the range of 2 to 50% by weight, preferably 5 to 20% by weight, based on the weight of the zinc oxide particles after the coating with silicon oxide and the silicone treatment. preferable. The silicon oxide is not limited, but is preferably a hydrous silicon oxide. When the proportion of silicon oxide in the zinc oxide particles is less than 2% by weight, the change in the surface potential of the zinc oxide particles may not be sufficient. On the other hand, when the proportion exceeds 50% by weight, the resulting zinc oxide particle composition Since the zinc oxide concentration in the product becomes thin, the ultraviolet shielding effect may be insufficient.

A method for forming the film made of the silicon oxide is not particularly limited, and specific examples thereof include the following methods.
First, ₂ to 50% by weight of a water-soluble silicate as SiO ₂ is added to an aqueous suspension of raw material zinc oxide particles as a total amount of zinc oxide and SiO ₂ . Next, while maintaining the temperature at 60 ° C. or higher, acid was added as a neutralizing agent over a period of 40 minutes or more, and the suspension was neutralized until the pH was in the range of 6.0 to 8.0. Thus, the zinc oxide particles can be obtained by forming a high-density coating layer made of silicon oxide on the surfaces of the zinc oxide particles.

In the production method described above, the concentration of the raw material zinc oxide particles in the aqueous suspension is preferably in the range of 50 to 250 g / L, and the raw material zinc oxide particles are sufficiently pulverized by a pulverizer such as a sand mill. It is desirable. As the water-soluble silicate, sodium silicate or potassium silicate is preferably used, but is not limited thereto. The neutralizing agent is not limited, but inorganic acids such as sulfuric acid and organic acids such as acetic acid and oxalic acid are preferably used.

Furthermore, in the production method described above, after adding a water-soluble silicate to an aqueous suspension of raw material zinc oxide particles, an acid is added thereto as a neutralizing agent to neutralize the water-soluble silicate. The temperature condition and the time condition (time width) for adding the neutralizing agent are important. That is, according to the present invention, a water-soluble silicate is added to an aqueous suspension of zinc oxide particles, and the temperature of the suspension is kept at 60 ° C. or higher, preferably 80 ° C. or higher for 40 minutes or longer. Preferably, a high density of hydrous silicon oxide is obtained by adding a neutralizing agent over a period of 60 minutes or more and neutralizing the suspension to a pH of 6.0 to 8.0. The coating layer can be formed on the surface of the zinc oxide particles.

As another production method, an aqueous suspension of zinc oxide particles is maintained at a temperature of 60 ° C. or higher, preferably 80 ° C. or higher. Preferably, it is also possible to neutralize the suspension to a pH of 6.0 to 8.0 by adding a neutralizing agent after adding simultaneously over 60 minutes or more. A high-density coating layer made of hydrous silicon oxide can be formed on the surface of the zinc oxide particles.

In the zinc oxide particles, before forming the coating layer made of silicon oxide, Ti, Zr, Sn, and other hydrated oxides or oxides are added to the zinc oxide as long as the formation of the coating layer is not hindered. May be contained in a small amount.

Furthermore, after forming a coating layer made of silicon oxide on the surface of zinc oxide, 0.5-30% by weight, preferably 2-15% by weight of Al, Ti, You may form the 2nd coating layer which consists of at least 1 sort (s) of oxide chosen from the group which consists of Zr, Sn, Sb, and rare earth elements. The rare earth element is not particularly limited, and examples thereof include yttrium, lanthanum, cerium, and neodymium. The second coating layer is particularly preferably made of an oxide of aluminum.

For the zinc oxide particles having such a second coating layer, an aqueous suspension of zinc oxide particles having a coating layer made of silicon oxide is prepared, and an aqueous solution of a water-soluble compound of the above element is added to the zinc oxide particles. Or it can obtain by adding an alkali as a neutralizing agent, neutralizing the compound of the said element, and forming the coating layer which consists of an oxide of the said element on the surface of the said zinc oxide particle.

Examples of water-soluble compounds of Al include, for example, aluminum nitrate, aluminum sulfate, sodium aluminate, etc., examples of water-soluble compounds of Ti, such as titanyl sulfate, and examples of water-soluble compounds of Zr include, for example, zirconium nitrate, Zirconium sulfate or the like, Sn as a water-soluble compound, for example, tin chloride, Sb as a water-soluble compound, for example, antimony chloride, and the like, and rare earth elements as a water-soluble compound, for example, cerium nitrate, etc. Can be mentioned.

As the acid as the neutralizing agent, an inorganic acid such as sulfuric acid and an organic acid such as acetic acid and oxalic acid are preferably used as described above. On the other hand, as the alkali as the neutralizing agent, for example, sodium hydroxide, potassium hydroxide, ammonium hydroxide and the like are preferably used.

When forming a second coating layer made of an oxide of the above element on a zinc oxide particle composition having a first coating layer made of silicon oxide, a coating layer made of an oxide of two or more elements is formed. In some cases, an aqueous solution of a water-soluble compound of a plurality of elements may be used to form a coating layer composed of a mixture of oxides of a plurality of elements at a time. Thus, it is preferable to form a coating layer made of an oxide layer by layer, and to make the second coating layer into a multilayer. In the case of forming a coating layer made of oxides of a plurality of elements including aluminum oxide, it is preferable to form the coating layer made of aluminum oxide last.

The zinc oxide particles used in the present invention are those obtained by silicone-treating zinc oxide particles after forming a coating layer made of silicon oxide on the surface of the zinc oxide particles or after forming the second coating layer. The silicone treatment is preferably treated with alkylsilane or organopolysiloxane.

The alkylsilane or organopolysiloxane is not particularly limited, and examples thereof include triethoxycaprylylsilane, methylhydrogenpolysiloxane, triethoxysilylethylpolydimethylsiloxyethyl dimethicone (KF-9908 manufactured by Shin-Etsu Chemical Co., Ltd.), / Tridecyl acrylate / triethoxysilylpropyl methacrylate / methacrylic dimethicone) copolymer (KP-574 manufactured by Shin-Etsu Chemical Co., Ltd.), dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer, triethoxysilylethylpolydimethylsiloxyethylhexyl dimethicone ( Examples thereof include KF-9909) manufactured by Shin-Etsu Chemical Co., Ltd. and dimethylpolysiloxane. Among them, dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer, triethoxysilylethyl polydimethylsiloxyethyl dimethicone (KF-9908) and triethoxysilylethyl polydimethylsiloxyethylhexyl dimethicone (KF-9909 manufactured by Shin-Etsu Chemical Co., Ltd.) It is preferable to use at least one of them. Two or more of these compounds may be used in combination.

The treatment method using the alkylsilane or organopolysiloxane is not particularly limited. For example, after the coated zinc oxide particles are dispersed in a solvent such as isopropyl alcohol, the alkylsilane or organopolysiloxane may be added or dry. The method of mixing with a mixer can be mentioned.

The alkylsilane or organopolysiloxane used for the surface treatment is preferably in the range of 1 to 20% by weight, preferably in the range of 3 to 10% by weight, based on the zinc oxide particles after the treatment with the compound. More preferred. When the alkylsilane or the organopolysiloxane is less than 1% by weight based on zinc oxide, the dispersibility in the oil in the cosmetic may be insufficient. Since the dispersibility of the oil in the oil and the water repellency are saturated, it may be economically disadvantageous.

It is preferable to use zinc oxide having an average primary particle diameter of 0.15 μm or less as a raw material so that the zinc oxide particles subjected to the above-described treatment used in the present invention have high transparency. When the average primary particle diameter of the zinc oxide particles is larger than 0.15 μm, the hiding power is large, whitening, and transparency is low. Moreover, the ultraviolet shielding effect is also lowered. The lower limit of the average primary particle diameter of the zinc oxide particles is not particularly limited, but is usually 0.01 μm. Here, the average primary particle diameter is defined by a constant direction diameter in a field of view of 100,000 times that of a transmission electron micrograph.

The zinc oxide dispersion of the present invention is obtained by dispersing zinc oxide particles that have been treated as described above in liquid silicone. The liquid silicone used in the present invention is not particularly limited as long as it is a silicone compound having liquid properties at room temperature, but among them, a cyclic silicone compound is preferable. Examples of liquid silicones that are not cyclic include linear dimethylpolysiloxane, trisiloxane, tetrasiloxane, methyltrimethicone (TMF-1.5 manufactured by Shin-Etsu Chemical Co., Ltd.), caprylyl methicone (FZ- manufactured by Toray Dow Corning Co., Ltd.). 3196, SS-3408) and the like.

The cyclic silicone compound is preferably methylcyclopolysiloxane having 3 to 6 repeating units. Of these, decamethylcyclopentasiloxane having a repeating unit of 5 is particularly preferred. The blending amount of the cyclic silicone varies depending on the application, the type of the cyclic silicone, and the like, but is preferably 20% to 60%.

The zinc oxide used in the zinc oxide dispersion of the present invention preferably has a zeta potential of −90 mV or less when dispersed in isopropanol (hereinafter referred to as “IPA”). This zeta potential refers to the potential at the limit part (slip surface) where the surface charge of the particle affects, and is an index of the surface potential that is difficult to measure directly.

In the zinc oxide dispersion of the present invention, the zinc oxide particles are preferably contained in a proportion of 30 to 79.5% by weight. If it is less than 30% by weight, the amount of the dispersion medium increases, so the degree of freedom of formulation when blended into cosmetics may be reduced. If it exceeds 79.5% by weight, the viscosity of the dispersion may increase significantly and the fluidity may be lost, and the temperature control of the dispersion process may be difficult.

In the zinc oxide dispersion of the present invention, it is preferable to use a dispersant. Thereby, the zinc oxide particles can be suitably dispersed in the liquid medium. Although a dispersing agent is not specifically limited, It is especially preferable at the point from which a favorable dispersion state is obtained when a silicone type dispersing agent is used.

Examples of the silicone dispersant include polyoxyalkylene / alkyl co-modified organopolysiloxane (KF-6038 manufactured by Shin-Etsu Chemical Co., Ltd., display name: lauryl PEG-9 polydimethylsiloxyethyl dimethicone), polyethylene-modified organopolysiloxane ((Shin-Etsu Chemical) Industrial KF-6028 (KF-6028P); display name: PEG-9 polydimethylsiloxyethyl dimethicone), polyoxyethylene / methylpolysiloxane copolymer, polyoxypropylene / methylpolysiloxane copolymer, poly (oxyethylene)・ Oxypropylene) methylpolysiloxane copolymer, methylpolysiloxane, cetylmethylpolysiloxane, poly (oxyethylene, oxypropylene) methylpolysiloxane copolymer, aminoethylaminopropylsiloxy Dimethyl siloxane copolymer, etc. In addition, polyoxyethylene lauryl ether phosphoric acid, polyoxyethylene stearyl ether phosphoric acid, polyoxyethylene oleyl ether phosphoric acid, polyoxyethylene alkylphenyl ether phosphoric acid, polyoxyethylene Such as oxyethylene polyoxypropylene cetyl ether phosphate, fatty acid polyglycerin (fatty acid having 12 to 22 carbon atoms, linear, branched, substituted fatty acid number of 1 to 5, and glycerin polymerization degree of 2 to 10) Non-silicone dispersants can be used alone or in combination with silicone dispersants.

Dispersants other than those described above can be used in combination with the above dispersants. The amount of the dispersing agent varies greatly depending on the type of dispersing agent, the amount and quality of the powder, and other raw materials to be blended, but is preferably 0.5 to 30% by weight based on the weight of the zinc oxide dispersion. If it is less than 0.5% by weight, it may be difficult to contain the pigment at a high concentration, or the storage stability of the dispersion may be deteriorated. On the other hand, if the amount is more than 30% by weight, the degree of freedom in blending the cosmetic may become narrow, or the cosmetic feel may deteriorate.

In the zinc oxide dispersion of the present invention, an oil agent may be added if necessary. The oil agent is not particularly limited. For example, natural animal and vegetable oils and fats (for example, olive oil, mink oil, castor oil, palm oil, beef tallow, evening primrose oil, coconut oil, castor oil, cacao oil, macadamia nut oil, etc.); wax (for example, Jojoba oil, beeswax, lanolin, carnauba wax, candelilla wax, etc.); higher alcohols (eg, lauryl alcohol, stearyl alcohol, cetyl alcohol, oleyl alcohol, etc.); higher fatty acids (eg, lauric acid, palmitic acid, stearic acid, olein) Acids, behenic acid, lanolin fatty acids, etc .; higher aliphatic hydrocarbons such as liquid paraffin, solid paraffin, squalane, petrolatum, ceresin, microcrystalline wax, etc .; synthetic ester oils (eg, butyl stearate, hexyl laurate, diisopropyl azimuth) , Diisopropyl sebacate, octyldodecyl myristate, isopropyl myristate, isopropyl palmitate isopropyl myristate, cetyl isooctanoate, neopentyl glycol dicaprate); silicone derivatives (eg, silicones such as methyl silicone and methyl phenyl silicone) Oil) and the like. Furthermore, oil-soluble vitamins, preservatives, whitening agents, and the like can be added.

The zinc oxide dispersion of the present invention is preferably one in which a powder component such as zinc oxide is dispersed in a liquid medium composed of a homogeneous phase containing the components as described above. That is, since it should be used as a material for preparing cosmetics by mixing with various cosmetic raw materials, it is preferable not to add components other than zinc oxide, silicone oil, surfactants and other oils. However, a trace component may be added as long as the performance as the dispersion of the present invention is not impaired.

The zinc oxide dispersion of the present invention is particularly useful in that it does not thicken when used in combination with a titanium oxide silicone dispersion. Titanium oxide used in titanium oxide silicone dispersion is generally used after one or both of silica treatment and aluminum hydroxide treatment, and silicon treatment. Thus, the zinc oxide dispersion of the present invention is particularly useful for the titanium oxide silicone dispersion.

The zinc oxide dispersion of the present invention may contain inorganic particles other than zinc oxide. Although it does not specifically limit as an inorganic particle which can be used together, For example, a titanium oxide etc. can be mentioned.

In particular, when titanium oxide is used in combination with zinc oxide, the problem of thickening tends to become prominent. Therefore, the effect of the present invention becomes more remarkable when used in combination with titanium oxide. When zinc oxide is used as an ultraviolet shielding agent in ultraviolet protective cosmetics, titanium oxide particles having different ultraviolet shielding areas are often used in combination, and the present invention is particularly useful in such cases. .

In the present invention, titanium oxide particles used in combination are not particularly limited, but titanium oxide particles provided with a coating layer made of silicon oxide in the same manner as zinc oxide particles as described above; alumina and / or aluminum hydroxide Titanium oxide particles provided with a layer comprising: titanium oxide having a layer made of silicon oxide as the first coating layer and a layer made of alumina and / or aluminum hydroxide as the second coating layer Can do. Further, after silica treatment, alumina and / or aluminum hydroxide treatment, a treatment for forming the second coating layer similar to the zinc oxide particles as described above or a silicone treatment may be applied. Good.

Formation of a layer made of silicon oxide on titanium oxide particles and formation of a layer made of alumina and / or aluminum hydroxide should be performed in the same manner as the above-described treatment of alumina and / or aluminum hydroxide on zinc oxide particles. Can do.

The titanium oxide particles preferably have an average primary particle diameter of 0.1 μm or less. When the particle diameter of the titanium oxide particles exceeds 0.1 μm, the hiding power is large, whitening, and transparency is low. The lower limit of the average primary particle diameter of the titanium oxide particles is not particularly limited, but is usually 0.01 μm. The average primary particle diameter is defined as a constant direction diameter in a field of view of 100,000 times that of a transmission electron micrograph. The average primary particle size is the size in the minor axis direction in the case of spindle-shaped titanium oxide.

When inorganic particles other than zinc oxide such as titanium oxide are used, the blending amount is preferably 10 times or less with respect to the weight of zinc oxide. When the amount exceeds 10 times, the amount of zinc oxide is small, so that the function of zinc oxide may not be fully exhibited.

When using inorganic particles other than zinc oxide such as titanium oxide, the total amount of inorganic particles containing zinc oxide is preferably 30 to 79.5% by weight based on the total amount of zinc oxide dispersion. If it is less than 30% by weight, the function of zinc oxide may not be fully exhibited because the amount of zinc oxide is small. If it exceeds 79.5% by weight, dispersion may be difficult.

The zinc oxide dispersion of the present invention can be obtained by a known ordinary production method. Specifically, it can be obtained by mixing raw materials and sufficiently dispersing and mixing them using a roll mill or bead mill.

The zinc oxide dispersion of the present invention can be used as a base material for preparing cosmetics. A cosmetic raw material is mixed with such a zinc oxide dispersion as necessary to obtain an ultraviolet protection cosmetic such as a sunscreen agent; a base makeup cosmetic such as a foundation; a point makeup cosmetic such as a lipstick. be able to. The cosmetic thus obtained is also one aspect of the present invention.

The cosmetics of the present invention can be in any form of oily cosmetics, aqueous cosmetics, O / W type cosmetics, and W / O type cosmetics. Especially, it can use especially suitably in a sunscreen agent.

The cosmetic may be used in combination with any aqueous component or oily component that can be used in the cosmetic field. The aqueous component and the oil component are not particularly limited, and examples thereof include oil agents, surfactants, humectants, higher alcohols, sequestering agents, natural and synthetic polymers, water-soluble and oil-soluble polymers, ultraviolet absorbers, Contains ingredients such as various extracts, colorants such as organic dyes, preservatives, antioxidants, pigments, thickeners, pH adjusters, fragrances, cooling agents, antiperspirants, bactericides, and skin activators. It may be a thing.

As said oil agent, the various things mentioned above can be used.
The lipophilic nonionic surfactant is not particularly limited. For example, sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate. Sorbitan fatty acid esters such as diglycerol sorbitan penta-2-ethylhexylate, diglycerol sorbitan tetra-2-ethylhexylate, mono-cotton oil fatty acid glycerin, glyceryl monoerucate, glyceryl sesquioleate, glyceryl monostearate, α, α '-Glycerol polyglycerin fatty acids such as glyceryl oleate pyroglutamate, glyceryl monostearate malate, propylene glycol monostearate It can be exemplified glycol fatty acid esters, hardened castor oil derivatives, glycerin alkyl ether.

The hydrophilic nonionic surfactant is not particularly limited. For example, POE sorbitan fatty acid esters such as POE sorbitan monooleate, POE-sorbitan monostearate, POE-sorbitan monooleate, POE-sorbitan tetraoleate, POE sorbite fatty acid esters such as POE-sorbite monolaurate, POE-sorbite monooleate, POE-sorbite pentaoleate, POE-sorbite monostearate, POE-glycerol monostearate, POE-glycerol monoisostearate, POE glycerol fatty acid esters such as POE-glycerin triisostearate, POE monooleate, POE distearate, POE monodiolate, PO such as ethylene glycol stearate Fatty acid esters, POE lauryl ether, POE oleyl ether, POE stearyl ether, POE behenyl ether, POE2-octyldodecyl ether, POE alkyl ethers such as POE cholestanol ether, POE octylphenyl ether, POE nonylphenyl ether, POE dinonyl POE alkyl phenyl ethers such as phenyl ether, pluronic types such as brulonic, POE / POP cetyl ether, POE / POP2-decyltetradecyl ether, POE / POP monobutyl ether, POE / POP hydrogenated lanolin, POE / POP glycerin ether POE / POP alkyl ethers such as Tetronic, Tetra POE / Tetra POP ethylenediamine condensates such as Tetronic, POE Castor POE hydrogenated castor oil, POE hydrogenated castor oil monoisostearate, POE hydrogenated castor oil triisostearate, POE hydrogenated castor oil monopyroglutamic acid monoisostearic acid diester, POE hydrogenated castor oil maleic acid, etc. Derivatives, POE beeswax / lanolin derivatives such as POE sorbite beeswax, alkanolamides such as coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide, POE propylene glycol fatty acid ester, POE alkylamine, POE fatty acid amide, sucrose fatty acid Examples thereof include esters, POE nonylphenyl formaldehyde condensates, alkylethoxydimethylamine oxide, trioleyl phosphoric acid and the like.

Examples of other surfactants include anionic surfactants such as fatty acid soaps, higher alkyl sulfates, POE lauryl sulfate triethanolamine, alkyl ether sulfates, alkyltrimethylammonium salts, alkylpyridinium salts, alkyl quaternary salts. Stabilizes cationic surfactants such as ammonium salts, alkyldimethylbenzylammonium salts, POE alkylamines, alkylamine salts, polyamine fatty acid derivatives, and amphoteric surfactants such as imidazoline-based amphoteric surfactants and betaine-based surfactants. And you may mix | blend in the range which does not have a problem in skin irritation.

The moisturizing agent is not particularly limited, and examples thereof include xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salt, dl- Examples thereof include pyrrolidone carboxylate, short-chain soluble collagen, diglycerin (EO) PO adduct, Isaiyobara extract, Achillea millefolium extract, and Merirot extract.

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, cetostearyl alcohol, monostearyl glycerin ether (batyl alcohol), 2-decyl. Examples thereof include branched chain alcohols such as tetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, and the like.

The sequestering agent is not particularly limited. For example, 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, sodium citrate, sodium polyphosphate, metaphosphoric acid Examples thereof include sodium, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid and the like.

The natural water-soluble polymer is not particularly limited. For example, arabia gum, tragacanth gum, galactan, guar gum, carob gum, caraya gum, carrageenan, pectin, agar, quince seed (malmello), alge colloid (guckweed extract), starch (rice, rice, Corn, potato, wheat), plant polymers such as glycyrrhizic acid, microbial polymers such as xanthan gum, dextran, succinoglucan and pullulan, and animal polymers such as collagen, casein, albumin and gelatin. .

The semi-synthetic water-soluble polymer is not particularly limited. For example, starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch, methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, Examples thereof include cellulose polymers such as hydroxypropylcellulose, sodium carboxymethylcellulose (CMC), crystalline cellulose, and cellulose powder, and alginic acid polymers such as sodium alginate and propylene glycol alginate.

The synthetic water-soluble polymer is not particularly limited, and examples thereof include vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, and polyvinyl pyrrolidone, and polyoxyethylene polymers such as polyethylene glycol 20,000, 40,000, and 60,000. Examples thereof include polymers, polyoxyethylene polyoxypropylene copolymer copolymer polymers, acrylic polymers such as sodium polyacrylate, polyethyl acrylate and polyacrylamide, polyethyleneimine, and cationic polymers.

The inorganic water-soluble polymer is not particularly limited, and examples thereof include bentonite, silicate A1Mg (beegum), laponite, hectorite, and silicic anhydride.

The ultraviolet screening agent is not particularly limited. For example, paraaminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N, N-dipropoxy PABA ethyl ester, N, N-diethoxy PABA ethyl ester, N, N-dimethyl Benzoic acid UV screening agents such as PABA ethyl ester and N, N-dimethyl PABA butyl ester; Anthranilic acid UV screening agents such as homomenthyl-N-acetylanthranylate; Amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate , Salicylic acid UV screening agents such as phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate; octylcinnamate, ethyl-4-isopropylcinnamate, methyl-2,5- Isopropyl cinnamate, ethyl-2,4-diisopropyl cinnamate, methyl-2,4-diisopropyl cinnamate, 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-ethylhexa Cinnamic acid-based ultraviolet screening agents such as noyl-diparamethoxycinnamate; 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 -Benzophenone-based UV shielding agents such as phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone; (4'-methylbenzylidene) -d, l-camphor, 3-benzylidene-d, l-camphor, urocanic acid, urocanic acid ethyl ester, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy- 5-methylphenylbenzoto Riazole, 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 2- (2′-hydroxy-5′-methylphenylbenzotriazole), dibenzalazine, dianisoylmethane, 4-methoxy-4′- Examples thereof include t-butyldibenzoylmethane and 5- (3,3-dimethyl-2-norbornylidene) -3-pentan-2-one.

Other drug components are not particularly limited and include, for example, vitamin A oil, retinol, retinol palmitate, inosit, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, nicotinic acid DL-α-tocopherol, magnesium ascorbate phosphate, 2 Vitamins such as -O-α-D-glucopyranosyl-L-ascorbic acid, vitamin D2 (ergocaciferol), dl-α-tocopherol, dl-α-tocopherol acetate, pantothenic acid, biotin; estradiol, ethinylestradiol, etc. Hormones; amino acids such as arginine, aspartic acid, cystine, cysteine, methionine, serine, leucine and tryptophan; anti-inflammatory agents such as allantoin and azulene; whitening agents such as arbutin; astringents such as tannic acid; L Menthol, cooling agents and sulfur camphor such as, lysozyme chloride, can be mentioned pyridoxine chloride, and the like.

There are no particular limitations on the various extracts, for example, Dokudami extract, Oat extract, Merirot extract, Odorikosou extract, Licorice extract, Peonies extract, Soap extract, Loofah extract, Kina extract, Yukinoshita extract, Clara extract, Kouhone extract, Fennel Extract, Primrose Extract, Rose Extract, Giant Extract, Lemon Extract, Shikon Extract, Aloe Extract, Shobu Root Extract, Eucalyptus Extract, Horsetail Extract, Sage Extract, Thyme Extract, Tea Extract, Seaweed Extract, Cucumber Extract, Clove Extract, Raspberry Extract, Melissa Extract , Carrot extract, horse chestnut extract, peach extract, peach leaf extract, mulberry extract, cornflower extract, hamamelis extract, placenta extract, thymus extract, silk extract, licorice Mention may be made of a kiss, etc.

Examples of the various powders include bengara, yellow iron oxide, black iron oxide, titanium mica, iron oxide-coated mica titanium, titanium oxide-coated glass flakes and other bright colored pigments, mica, talc, kaolin, sericite, titanium dioxide, Examples thereof include inorganic powders such as silica and organic powders such as polyethylene powder, nylon powder, crosslinked polystyrene, cellulose powder, and silicone powder. Preferably, a part or all of the powder component is hydrophobized by a known method with a substance such as silicones, fluorine compounds, metal soaps, oils, acyl glutamates in order to improve sensory characteristics and cosmetic durability. Used. Moreover, you may mix and use the other zinc oxide particle which does not correspond to this invention.

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the examples, “part” means “part by weight” unless otherwise specified, and “%” means “% by weight” unless otherwise specified.

Measuring method of zeta potential Particles were put into IPA so as to be 10% by weight, and dispersed with an ultrasonic homogenizer for 3 minutes. Using this prepared sample, the zeta potential was measured using a particle size distribution / zeta potential measuring device DT-1200 (manufactured by Dispersion technology). A total of 8 measurements were taken, and the average value was taken as the zeta potential of the particles.

Example 1
Particles obtained by applying dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer treatment to zinc oxide particles having a silica layer formed on the surface were prepared. In addition, the specific surface area (BET method) of the raw material zinc oxide particles before the surface treatment is 50 m ² / g, the average primary particle diameter of the particles before the treatment is 0.02 μm, and the silica layer is based on the total amount of the particles after the treatment. 10% by weight, and the silicone layer was 4% by weight based on the total amount of particles after treatment. The zeta potential of the particles in IPA was −104 mV.
50 parts of the obtained zinc oxide, 6 parts of decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.), polyether-modified silicone (KF-6038, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts of φ0.5 mm zirconia beads Was put into a mayonnaise bottle, mixed, and then treated with a paint shaker (manufactured by Red Devil) for 1 hour. A zinc oxide dispersion was obtained by separating the beads.

Example 2
Particles obtained by applying dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer treatment to zinc oxide particles having a silica layer formed on the surface were prepared. In addition, the specific surface area (BET method) of the raw material zinc oxide particles before the surface treatment is 50 m ² / g, the average primary particle diameter of the particles before the treatment is 0.02 μm, and the silica layer is based on the total amount of the particles after the treatment. The amount of the silicone layer was 4% by weight based on the total amount of the particles after the treatment. The zeta potential of the particles in IPA was −119 mV. 50 parts of the obtained zinc oxide, 6 parts of decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.), polyether-modified silicone (KF-6038, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts of φ0.5 mm zirconia beads Was put into a mayonnaise bottle, mixed, and then treated with a paint shaker (manufactured by Red Devil) for 1 hour. A zinc oxide dispersion was obtained by separating the beads.

Example 3
Particles obtained by applying dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer treatment to zinc oxide particles having a silica layer formed on the surface were prepared. The specific surface area (BET method) of the raw material zinc oxide particles before the surface treatment is 30 m ² / g, the average primary particle diameter of the particles before the treatment is 0.035 μm, and the silica layer is based on the total amount of the particles after the treatment. 5% by weight, and the silicone layer was 4% by weight with respect to the total amount of particles after treatment. The zeta potential of the particles in IPA was -133 mV. 50 parts of the obtained zinc oxide, 6 parts of decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.), polyether-modified silicone (KF-6038, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts of φ0.5 mm zirconia beads Was put into a mayonnaise bottle, mixed, and then treated with a paint shaker (manufactured by Red Devil) for 1 hour. A zinc oxide dispersion was obtained by separating the beads.

Comparative Example 1
Particles obtained by subjecting zinc oxide particles not forming a silica layer on the surface to dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer treatment were prepared. In addition, the specific surface area (BET method) of the raw material zinc oxide particles before the surface treatment is 50 m ² / g, the average primary particle diameter of the particles before the treatment is 0.02 μm, and the silicone layer is based on the total amount of the particles after the treatment. 4% by weight. The particle had a zeta potential in IPA of -18 mV. 50 parts of the obtained zinc oxide, 6 parts of decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.), polyether-modified silicone (KF-6038, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts of φ0.5 mm zirconia beads Was put into a mayonnaise bottle, mixed, and then treated with a paint shaker (manufactured by Red Devil) for 1 hour. A zinc oxide dispersion was obtained by separating the beads.

Comparative Example 2
Particles obtained by applying dimethylpolysiloxane / methylhydrogenpolysiloxane copolymer treatment to zinc oxide particles having a silica layer formed on the surface were prepared. In addition, the specific surface area (BET method) of the raw material zinc oxide particles before the surface treatment is 50 m ² / g, the average primary particle diameter of the particles before the treatment is 0.02 μm, and the silica layer is based on the total amount of the particles after the treatment. The amount of the silicone layer was 4% by weight based on the total amount of the particles after the treatment. The zeta potential of the particles in IPA was -44 mV.
50 parts of the obtained zinc oxide, 6 parts of decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.), polyether-modified silicone (KF-6038, manufactured by Shin-Etsu Chemical Co., Ltd.) and 100 parts of φ0.5 mm zirconia beads Was put into a mayonnaise bottle, mixed, and then treated with a paint shaker (manufactured by Red Devil) for 1 hour. A zinc oxide dispersion was obtained by separating the beads.

[viscosity]
Place the zinc oxide dispersion in a 50 ml screw bottle and use a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) to set the rotor 3 was used, and the viscosity 60 seconds after the start of rotation was measured. Table 1 shows the data of the viscosity after dispersion (20 ° C.).

[Mixing test with titanium oxide]
Hydrophobized titanium oxide (STR-100A-LP, manufactured by Sakai Chemical Industry Co., Ltd.) 40 parts, decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.) 6 parts, polyether-modified silicone (KF-6038, Shin-Etsu) Chemical Co., Ltd.) 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 1 hour. A titanium oxide dispersion was obtained by separating the beads. The specific surface area (BET method) of the raw material titanium oxide particles before the surface treatment is a spindle shape of 100 m ² / g (average primary particle diameter is 0.02 μm for the minor axis and 0.1 μm for the major axis), and the silica layer Was 8% by weight with respect to the total amount of particles after treatment, the aluminum hydroxide layer was 4% by weight with respect to the total amount of particles after treatment, and the silicone layer was 4% by weight with respect to the total amount of particles after treatment. 30 g of the zinc oxide dispersion produced in each of Examples 1 to 3 and Comparative Examples 1 and 2 was placed in a 50 ml screw bottle, and 30 g of the resulting titanium oxide dispersion was added thereto. Thereafter, the mixture was shaken up and down 100 times to obtain a mixture of zinc oxide dispersion and titanium oxide dispersion. Using a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd.), rotor No. 3 was used, and the viscosity 60 seconds after the start of rotation was measured. The viscosity (20 ° C.) data is shown in Table 2.

Hydrophobized titanium oxide (STR-100C-LP, manufactured by Sakai Chemical Industry Co., Ltd.) 40 parts, Decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.) 6 parts, Polyether-modified silicone (KF-6038, Shin-Etsu) Chemical Co., Ltd.) 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 1 hour. A titanium oxide dispersion was obtained by separating the beads. The specific surface area (BET method) of the raw material titanium oxide particles before the surface treatment is a spindle shape of 100 m ² / g (average primary particle diameter is 0.02 μm for the minor axis and 0.1 μm for the major axis). The aluminum layer was 7% by weight based on the total amount of particles after treatment, and the silicone layer was 4% by weight based on the total amount of particles after treatment. 30 g of the zinc oxide dispersion prepared in Example 1 was put in a 50 ml screw bottle, and 30 g of the obtained titanium oxide dispersion was added thereto. Thereafter, the mixture was shaken up and down 100 times to obtain a mixture of zinc oxide dispersion and titanium oxide dispersion. Using a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd.), rotor No. 3 was used, and the viscosity 60 seconds after the start of rotation was measured. The viscosity (20 ° C.) data is shown in Table 3.

Hydrophobized titanium oxide (STR-100W-LP, manufactured by Sakai Chemical Industry Co., Ltd.) 40 parts, decamethylcyclopentasiloxane (KF-995, manufactured by Shin-Etsu Chemical Co., Ltd.) 6 parts, polyether-modified silicone (KF-6038, Shin-Etsu) Chemical Co., Ltd.) 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 1 hour. A titanium oxide dispersion was obtained by separating the beads. The specific surface area (BET method) of the raw material titanium oxide particles before the surface treatment is a spindle shape of 100 m ² / g (average primary particle diameter is 0.02 μm for the minor axis and 0.1 μm for the major axis), and the silica layer Was 10% by weight based on the total amount of particles after treatment, and the silicone layer was 4% by weight based on the total amount of particles after treatment. 30 g of the zinc oxide dispersion prepared in Example 1 was put in a 50 ml screw bottle, and 30 g of the obtained titanium oxide dispersion was added thereto. Thereafter, the mixture was shaken up and down 100 times to obtain a mixture of zinc oxide dispersion and titanium oxide dispersion. Using a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd.), rotor No. 3 was used, and the viscosity 60 seconds after the start of rotation was measured. The viscosity (20 ° C.) data is shown in Table 4.

From the results of Table 2, Table 3 and Table 4, thickening is not observed in the mixture of Examples 1 to 3 and the titanium oxide dispersion, but thickening is observed in the mixture of Comparative Examples 1 and 2 and the titanium oxide dispersion. did.

According to the present invention, thickening of a composition containing zinc oxide particles can be prevented, and thereby zinc oxide particles can be stably blended in cosmetics.

Claims (7)

A zinc oxide dispersion characterized in that particles obtained by applying silicone treatment to zinc oxide particles having a coating layer made of silicon oxide on the surface are dispersed in liquid silicone. The zinc oxide dispersion according to claim 1, wherein particles having a zeta potential in isopropanol of -90 mV or less are used. 3. The zinc oxide dispersion according to claim 1, wherein the coating layer made of silicon oxide is 2 to 50% by weight based on the weight of the zinc oxide subjected to silicone treatment to form the coating layer. Furthermore, the zinc oxide dispersion of Claim 1, 2, or 3 containing a silicone type dispersing agent. Furthermore, the zinc oxide dispersion of Claim 1, 2, 3 or 4 containing a titanium oxide particle. 6. The titanium oxide particles are subjected to any one or both of inorganic treatment selected from the group consisting of alumina and / or aluminum hydroxide treatment and silica treatment, and further subjected to silicone treatment. Zinc oxide dispersion. A cosmetic obtained by blending the zinc oxide dispersion according to claim 1, 2, 3, 4, 5 or 6.