Dispersion composition

Abstract

To provide a dispersion composition having excellent powder dispersibility, and a cosmetic containing the dispersion composition which does not have stickiness and has excellent use feeling.SOLUTION: A dispersion composition according to the present invention contains (A) metal oxide powder, (B) amino-modified silicone, (C) one or two kinds or more of carboxylic acid selected from the group consisting of isostearic acid, oleic acid, stearic acid, palmitic acid, myristic acid and lactic acid, and (D) liquid oil component, where a blending mass ratio [(C) / (B)] of the component (C) to the component (B) is 0.01 to 0.7.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a dispersion composition which exhibits excellent powder dispersibility and a good feeling when used, and a cosmetic preparation which contains the dispersion composition. [Background technology]

[0002] Powders such as ultraviolet scattering agents and pigments are widely used in cosmetics to provide sunscreen effects and make-up effects. Cosmetics containing powders are often produced by first obtaining a composition in which the powder is uniformly dispersed in an oily component, and then mixing the composition with a cosmetic base containing an aqueous component or the like.

[0003] As a technique for improving the dispersion state of powder and enhancing stability over time in cosmetics containing powder, a method has been proposed in which various dispersants are added to an oily component together with the powder in advance, and the mixture is processed in a media-agitating mill with high crushing power, such as a bead mill, to prepare a dispersion composition, and then this dispersion composition is mixed with a cosmetic base to produce the cosmetic (Patent Document 1).

[0004] However, it is known that the smaller the particle size of the mother nucleus of a powder, the more likely it is to aggregate when mixed with a base. In addition, the amino-modified silicone used as a dispersant in Patent Document 1 is excellent in improving the dispersibility of powders, but the compounded amount tends to be sticky. Therefore, when a high concentration of amino-modified silicone is used to obtain a dispersion composition in which powders with small particle sizes such as ultraviolet scattering agents are uniformly dispersed, problems arise in that the product becomes sticky and has a poor feel when used. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2012 / 157694 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a dispersion composition that exhibits excellent dispersibility of powders such as an ultraviolet scattering agent, and a cosmetic preparation that contains the dispersion composition that is non-sticky and has an excellent feel when used.

[0007] As a result of extensive research aimed at solving the above problems, the inventors discovered that by adding a combination of an amino-modified silicone, which has conventionally been used as a dispersant, and a specific carboxylic acid to an oily component containing a powder, a dispersion composition in which the powder is well dispersed can be obtained, thereby completing the present invention.

[0008] That is, the present invention provides (A) a metal oxide powder; (B) amino-modified silicone, (C) one or more carboxylic acids selected from the group consisting of isostearic acid, oleic acid, stearic acid, palmitic acid, myristic acid, and lactic acid, and (D) Liquid oil, Contains The dispersion composition is provided in which the blending mass ratio of the component (C) to the component (B) [(C) / (B)] is 0.01 to 0.7. Furthermore, the present invention provides a cosmetic preparation comprising the dispersion composition. Effect of the Invention

[0009] By adopting the above-mentioned constitution, the present invention can obtain a dispersion composition having excellent powder dispersibility and a good feeling of use. According to the present invention, it is possible to reduce the amount of amino-modified silicone required to improve the dispersion state of the powder, and therefore it is possible to avoid stickiness caused by amino-modified silicone. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The dispersion composition according to the present invention is characterized by containing (A) a metal oxide powder, (B) an amino-modified silicone, (C) a specific carboxylic acid, and (D) a liquid oil. Each component constituting the composition of the present invention will be described in detail below.

[0011] <(A) Metal oxide powder> The metal oxide powder (A) of the present invention (hereinafter sometimes simply referred to as "component (A)") is not particularly limited, and can be selected from those that are usually blended in cosmetics as ultraviolet scattering agents or pigments. Examples include titanium oxide, zinc oxide, cerium oxide, aluminum oxide (alumina), zirconium oxide, magnesium oxide, calcium oxide, iron oxide, and the like. Of these, the metal oxide powder (A) of the present invention is preferably a powder used as an ultraviolet scattering agent, such as titanium oxide or zinc oxide.

[0012] The shape of the metal oxide particles (excluding iron oxide) in the present invention is not particularly limited, and examples thereof include plate-like (including flake-like, thin plate-like, scale-like, leaf-like, mica-like, foil-like, etc.), spherical, columnar, block-like, etc. The particle size is not particularly limited, and examples thereof include those having an average primary particle size of about 2 nm to 5 μm.

[0013] Generally, the smaller the particle size of a powder, the more difficult it is to maintain a uniformly dispersed state, so in the present invention, it is particularly advantageous for the powder to be fine particles having an average primary particle size of 2 nm to 500 nm, particularly 2 nm to 250 nm. In this specification, the "average primary particle size" refers to the diameter of a circle equivalent to the projected area of ​​the primary particles in a transmission electron microscope (TEM) image.

[0014] The (A) metal oxide powder of the present invention may be untreated, may have a hydrophobic surface, or may have been subjected to a hydrophobic surface treatment. In addition, the (A) metal oxide powder may be a metal oxide substrate coated with silica, aluminum hydroxide, or the like.

[0015] (A) Methods for hydrophobizing metal oxide powder with a hydrophobizing agent include, for example, treatment with silicone compounds such as methylhydrogenpolysiloxane and methylpolysiloxane, treatment with fluorine compounds such as perfluoroalkyl phosphates and perfluoroalcohols, treatment with amino acids such as N-acylglutamic acid, treatment with silane compounds such as triethoxycaprylylsilane, treatment with lecithin, treatment with metal soaps, treatment with fatty acids, treatment with alkyl phosphates, etc. Among these, treatment with silicone compounds is preferred.

[0016] Examples of silicone compounds used in the silicone compound treatment include various silicone oils such as dimethylpolysiloxane (also called dimethicone), methylphenylpolysiloxane, methylhydrogenpolysiloxane, methylcyclopolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, octamethyltrisiloxane, tetradecamethylhexasiloxane, dimethylsiloxane-methyl(polyoxyethylene)siloxane-methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane-methyl(polyoxyethylene)siloxane copolymer, dimethylsiloxane-methyl(polyoxypropylene)siloxane copolymer, dimethylsiloxane-methylcetyloxysiloxane copolymer, and dimethylsiloxane-methylstearoxysiloxane copolymer. Methylhydrogenpolysiloxane and methylpolysiloxane are preferred.

[0017] The blending amount of the (A) metal oxide powder is not particularly limited as long as it is an amount required to impart effects such as ultraviolet protection effect and makeup effect to the cosmetic. For example, the lower limit of the blending amount relative to the total amount of the dispersion composition according to the present invention is 5 mass%, 6 mass%, 7 mass%, 8 mass%, 9 mass%, 10 mass%, 11 mass%, and 12 mass%, and the upper limit is 60 mass%, 55 mass%, and 50 mass%. The blending amount range relative to the total amount of the dispersion composition is 5 to 60 mass%, etc. In addition, when preparing a cosmetic containing the dispersion composition according to the present invention, the blending amount of the (A) component relative to the total amount of the cosmetic is 5 mass%, 6 mass%, 7 mass%, 8 mass%, 9 mass%, and 10 mass%, and the upper limit is 60 mass%, 55 mass%, 50 mass%, 45 mass%, 40 mass%, and 35 mass%, and the blending amount range relative to the total amount of the cosmetic is 5 to 60 mass%, etc.

[0018] <(B) Amino-modified silicone> The amino-modified silicone (B) of the present invention (hereinafter sometimes simply referred to as "component (B)") is used as a powder dispersant, and is a side-chain type amino-modified silicone represented by the following general formula (1) having a functional group equivalent of 1 to 20,000. [ka] In the above general formula (1), X is an alkyl group having 1 to 18 carbon atoms, and R and R' are alkyl groups (alkylene groups) having 1 to 6 carbon atoms. The functional group equivalent of the (B) amino-modified silicone is from 1 to 20,000, and preferably from 1,000 to 15,000. If the functional group equivalent exceeds 20,000, dispersion may become insufficient.

[0019] Commercially available products can also be used as the amino-modified silicone (B) of the present invention, and preferred commercially available products include Silicone KF8004 (amodimethicone), Silicone KF8005S (aminoethyl aminopropyl dimethicone), Silicone KF867S (amodimethicone) (all manufactured by Shin-Etsu Chemical Co., Ltd.), and the like.

[0020] The blending amount of the amino-modified silicone (B) is preferably 0.01 to 0.4, more preferably 0.05 to 0.3, in terms of the blending mass ratio ((B) / (A)) to the component (A) blended in the dispersion composition of the present invention or in a cosmetic containing the dispersion composition. If the blending amount of the component (B) is below the above range, the dispersibility of the powder may be insufficient, and as the blending amount exceeds the above range, stickiness may occur, and the feel of use during application may become poor. The blending amount range based on the total amount of the dispersion composition is preferably, for example, 0.1 to 10 mass% or 0.2 to 8 mass%. In addition, when preparing a cosmetic containing the dispersion composition of the present invention, the blending amount of the component (B) based on the total amount of the cosmetic is preferably 0.1 to 10 mass%, more preferably 0.2 to 8 mass%.

[0021] <(C) Specific Carboxylic Acid> The (C) carboxylic acid of the present invention (hereinafter sometimes simply referred to as "component (C)") refers to one or more carboxylic acids selected from the group consisting of isostearic acid, oleic acid, stearic acid, palmitic acid, myristic acid, and lactic acid.

[0022] The blending amount of component (C) relative to the component (B) blended in the dispersion composition of the present invention or in a cosmetic preparation containing said dispersion composition, the blending mass ratio ((C) / (B)) is 0.01 to 0.7, preferably 0.05 to 0.5. If the blending amount of component (C) is below this range, the dispersion state will be inferior, and if it is greater than this range, the dispersion medium will be excessively thickened and gelled, resulting in a poor feel when used.

[0023] The blending amount of the (C) component of the present invention is preferably 0.1 to 6 mass% and more preferably 0.2 to 4 mass% based on the total amount of the dispersion composition. If the blending amount of the (C) component is less than 0.1 mass%, sufficient dispersibility may not be obtained, and if it exceeds 6 mass%, the feeling of use tends to be inferior. When preparing a cosmetic containing the dispersion composition of the present invention, the blending amount of the (C) component of the total amount of the cosmetic is, for example, preferably 0.01 to 0.8 mass%, more preferably 0.02 to 0.5 mass%.

[0024] <(D) Liquid oil> The liquid oil (D) of the present invention (hereinafter, sometimes simply referred to as "component (D)") is an oil that is usually blended into cosmetics and is liquid at room temperature (25°C). Examples include silicone oil, hydrocarbon oil, higher alcohol, ester oil, fatty acid other than component (C), etc. From the viewpoint of improving the feeling of use, it is preferable to contain silicone oil.

[0025] Examples of silicone oils include linear or cyclic polysiloxanes such as dimethylpolysiloxane (also known as dimethicone), methylphenylpolysiloxane, methylhydrogenpolysiloxane, decamethylpolysiloxane, dodecamethylpolysiloxane, tetramethyltetrahydrogenpolysiloxane, cyclotetradimethylsiloxane, cyclopentasiloxane, and cyclopentadimethylsiloxane.

[0026] Examples of hydrocarbon oils include liquid paraffin, isohexadecane, isododecane, undecane, tridecane, ozokerite, squalane, squalene, pristane, paraffin, isoparaffin, ceresin, petrolatum, microcrystalline wax, hydrogenated polyisobutene, and olefin oligomers.

[0027] Examples of higher alcohols include straight-chain 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, hexyldodecanol, isostearyl alcohol, and octyldodecanol.

[0028] Examples of ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexylate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, triisostearate, Examples of suitable glyceryl trimethylolpropane include pentaerythrityl tetraethylhexanoate, glycerin tri-2-ethylhexylate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, and triethyl citrate.

[0029] Examples of fatty acids other than the component (C) include linoleic acid and linolenic acid.

[0030] As the liquid oil component (D) of the present invention, one type selected from the above oil components may be used alone, or two or more types may be used in combination. The amount of the component (D) is not particularly limited, and is an amount that serves as a dispersion medium for the components (A) to (C), and may be, for example, 25 to 80% by mass, or 30 to 70% by mass, based on the total amount of the dispersion composition.

[0031] The dispersion composition according to the present invention can be further blended with optional ingredients that are usually used in cosmetics to prepare an oil-based cosmetic product or an oil-in-water or water-in-oil emulsion composition. The dispersion composition according to the present invention is particularly suitable for preparing an oil-in-water emulsion composition in which the dispersion composition is the internal oil phase.

[0032] As the optional ingredients, various oils, ultraviolet absorbers, oil-based drugs, fragrances, aqueous solvents, surfactants, moisturizers, water-soluble drugs, powders other than the component (A), coloring materials, pigments, as well as antioxidants, preservatives, pH adjusters, chelating agents, etc. may be appropriately blended as needed.

[0033] Examples of the ultraviolet absorbing agent include octyl methoxycinnamate, octocrylene, hexyl diethylaminohydroxybenzoate, t-butyl methoxydibenzoylmethane, ethylhexyl triazone, ethylhexyl methoxycinnamate, and bisethylhexyloxyphenol methoxyphenyl triazine.

[0034] Examples of the aqueous solvent include water (purified water, ion-exchanged water, tap water, etc.), lower alcohols, and mixtures thereof.

[0035] Examples of surfactants include polyoxyalkylene alkyl ethers, polyalkylene glycol fatty acid esters, POE hydrogenated castor oil derivatives, POE alkyl ethers, POE·POP alkyl ethers, PEG fatty acid esters, polyglycerin fatty acid esters, POE glycerin fatty acid esters, and PEG glyceryl isostearate. Other examples include polyglyceryl-2 diisostearate, sorbitan sesquiisostearate, etc. Here, POE, POP, and PEG are abbreviations for polyoxyethylene, polyoxypropylene, and polyethylene glycol, respectively.

[0036] Moisturizing agents include polyoxyalkylene-polyoxyethylene copolymer dialkyl ether, 1,3-butylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, glycerin, diglycerin, xylitol, maltitol, maltose, D-mannitol, etc.

[0037] The dispersion composition according to the present invention and the cosmetic preparation containing the dispersion composition can be produced by a conventional method. For example, the dispersion composition can be obtained by adding and mixing the components (A) to (C) to the component (D) of the present invention, which serves as a dispersion medium, and dispersing the mixture sufficiently with a stirrer such as a homogenizer or a stirring and grinding machine such as a bead mill. When preparing a cosmetic preparation containing the dispersion composition according to the present invention, other oily components can be added to the dispersion composition, mixed with an aqueous phase component obtained by mixing separately, and emulsified with a homomixer or the like to obtain an emulsion cosmetic preparation.

[0038] The form of the cosmetic according to the present invention is not particularly limited, and it can be widely applied to any form, such as skin care cosmetics such as lotions, milky lotions, creams, gels, and serums, sunscreen cosmetics, and makeup cosmetics. EXAMPLES

[0039] The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. The blending amount is expressed in mass% relative to the total composition unless otherwise specified. Before describing each example in detail, the evaluation method adopted will be described.

[0040] 1. Dispersibility The dispersibility of the powder was evaluated by the viscosity decay rate. Specifically, the viscosity of the prepared dispersion composition was measured using a rheometer (MCR302, manufactured by Anton Paar) while gradually increasing the shear rate applied to each composition. Shear rate 10 s -1 Viscosity η(10s -1 ) and shear rate of 1000 s -1 Viscosity η(1000s -1 ) was recorded, and the viscosity decay rate was calculated using the following formula. Viscosity decay rate={η(10s -1 )-η(1000s -1 )} / η(1000s -1 ) The smaller the viscosity decay rate, the less the viscosity reduction due to shear occurs, i.e., the less structural viscosity due to powder aggregation occurs, and the better the dispersion state of the powder. <Evaluation criteria> A: The viscosity decay rate was 3.0 or less. B: The viscosity decay rate was greater than 3.0 and smaller than 5.0. C: The viscosity decay rate was 5.0 or more and less than 10.0. D: The viscosity decay rate was 10.0 or more. E: The composition gelled and solidified, making measurement impossible.

[0041] 2. Feeling of use The prepared compositions were applied to the skin by a panel of 10 experts, and the feel after application (non-stickiness) was evaluated according to the following criteria. <Evaluation criteria> A: More than 8 out of 10 panelists answered that it was not sticky. B: Between 6 and 8 out of 10 panelists answered that it was not sticky. C: Between 4 and 6 out of 10 panelists answered that it was not sticky. D: Less than 4 out of 10 panelists answered that it was not sticky.

[0042] <Examples 1 to 19 and Comparative Examples 1 to 13> The other ingredients listed in the table were added and mixed with the liquid oil (cyclopentasiloxane, etc.) which was the dispersion medium, and the mixture was subjected to dispersion processing at 7000 rpm for 3 minutes using a tabletop homogenizer. The obtained dispersion compositions were evaluated according to the above-mentioned evaluation methods and criteria, and the evaluation results are shown in the table.

[0043] [Table 1]

[0044] [Table 2]

[0045] As shown in Table 1, the compositions of Comparative Examples 1 to 3, which contain only amino-modified silicone (amodimethicone), which has traditionally been used as a dispersant, at different amounts, exhibited good dispersibility by increasing the amount of amino-modified silicone, but the compositions were sticky when used. Also, the compositions of Comparative Examples 4 to 6, which did not contain (B) amino-modified silicone and contained only isostearic acid, which is the specific carboxylic acid (C) of the present invention, exhibited poor powder dispersion. On the other hand, a composition with excellent dispersibility and no stickiness was obtained by combining and blending the amino-modified silicone (B) of the present invention with the specific carboxylic acid (C), as shown in Table 2. However, in Comparative Example 7, where the blending amount of isostearic acid, which is the specific carboxylic acid (C), was the same as the blending amount of the amino-modified silicone (B), i.e., ((C) / (B))=1.0, a deterioration in the feel during use was confirmed.

[0046] [Table 3]

[0047] Table 3 shows examples in which the component (A) of the present invention is made of a powder with an untreated surface (titanium oxide, zinc oxide) or a powder with a hydrophobized surface. Regardless of the powder used, a composition having excellent dispersibility and no stickiness was obtained.

[0048] [Table 4]

[0049] [Table 5]

[0050] As shown in Table 4, the compositions of Examples 12 to 17, which used the specific carboxylic acid (C) of the present invention, and Examples 18 to 19, which used a silicone oil or a hydrocarbon oil other than cyclopentasiloxane as the liquid oil (D) of the present invention, all had excellent dispersibility and were not sticky when used. On the other hand, as shown in Table 5, the compositions of Comparative Example 8, which did not contain the component (C) of the present invention, and Comparative Examples 9 to 10, which used carboxylic acids other than the component (C) of the present invention (citric acid, malic acid), had poor dispersibility. The PEG-10 dimethicone in the table is an auxiliary (POE-modified siloxane) used together with amino-modified silicone to improve powder dispersibility in an emulsion composition containing powder (JP Patent Publication 2009-209123). The composition of Comparative Example 11, which used PEG-10 dimethicone instead of component (C) of the present invention, had poor dispersibility. Polyglyceryl-2 diisostearate and sorbitan isostearate in the table are lipophilic nonionic surfactants similar to isostearic acid, and are known to have the effect of improving the dispersion state of powder. The compositions of Comparative Examples 12 to 13, which used polyglyceryl-2 diisostearate or sorbitan isostearate instead of component (C) of the present invention, had poor dispersibility.

[0051] The formulation of an oil-in-water emulsion cosmetic containing the dispersion composition of the present invention is exemplified below. It goes without saying that the present invention is not limited to the following formulation examples, but is defined by the claims. The blending amount is expressed as mass % relative to the total amount of the composition or the oil-in-water emulsion cosmetic.

[0052] Preparation of Dispersion Composition 1 Ingredients Mass% Amodimethicone 4.5 Isostearic acid 0.5 Dimethicone 47.5 Dimethicone / Silica-treated Zinc Oxide Microparticles (20 nm) 47.5 The other ingredients were added to and mixed with dimethicone, and a dispersion treatment was carried out using a tabletop homogenizer at 7000 rpm for 3 minutes to prepare Dispersion Composition 1.

[0053] Formulation example 1: Oil-in-water gel sunscreen Ingredients Mass% 1. Dispersion Composition 1 21.1 2. Dimethicone 3 3. Ethylhexyl methoxycinnamate 7 4. Bis-ethylhexyloxyphenol methoxyphenyl triazine 2 5. Ethylhexyl triazone 1 6. Isodecyl neopentanoate 2 7.PPG-17 1 8. Tocopherol 0.05 9. Alcohol 5 10. Butylene glycol 7 11. Glycerin 2.5 12. Succinoglycan 0.15 13. (Dimethylacrylamide / Sodium acryloyldimethyltaurate) Crosspolymer 0.25 14. Stearoxy hydroxypropyl methylcellulose 0.1 15. Phenoxyethanol 0.3 16. PEG-100 hydrogenated castor oil 1.5 17. Tranexamic acid 2 18. Citric acid / Na citrate (as needed) 19.Water Residual

[0054] The oil-in-water gel sunscreen was obtained by emulsifying and mixing the oil phase components 1 to 8 and the water phase components 9 to 19 in a conventional manner. The obtained oil-in-water gel sunscreen had a good powder dispersion state and was excellent in feel when used.

Claims

1. (A) a metal oxide powder, (B) amino-modified silicone, (C) one or more carboxylic acids selected from the group consisting of isostearic acid, oleic acid, stearic acid, palmitic acid, myristic acid, and lactic acid, and (D) liquid oil, Contains A dispersion composition in which the blending mass ratio of the component (C) to the component (B) [(C) / (B)] is 0.01 to 0.

7.

2. 2. The dispersion composition according to claim 1, wherein a blending mass ratio of the component (B) to the component (A) [(B) / (A)] is 0.01 to 0.

4.

3. The dispersion composition of claim 1 , wherein component (D) comprises a silicone oil.

4. An emulsion composition comprising the dispersion composition according to claim 1.

5. The emulsion composition according to claim 4, which is an oil-in-water emulsion composition.

6. A cosmetic comprising the dispersion composition according to claim 1.

7. The cosmetic according to claim 6, wherein the blending amount of the component (C) is 0.01 to 0.8% by mass based on the total amount of the cosmetic.

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