JP2572665B2 - Coated pigment and cosmetic containing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a novel coated pigment, and more specifically to a novel coated pigment, which gives a good transparency and bare skin feeling and removes color unevenness such as spots and freckles existing on the skin. The present invention relates to a novel coated pigment excellent in the effect of making it hard to see and a cosmetic containing the same.

[Problems to be solved by conventional technology and invention]

In general, cosmetics are required to hide uneven color such as spots and freckles existing on the skin when applied to the skin due to the nature of the cosmetic effect. Conventionally, to meet this demand, pigments with high hiding power, that is, pigments with a large refractive index and high coloring power, such as titanium dioxide, red iron oxide,
Black iron oxide, organic dyes, and the like are blended as color pigments to increase the cover power, and a method has been adopted in which uneven color such as spots and freckles existing on the skin is hardly seen.

However, pigments having a high hiding power as described above, that is, cosmetics containing a large amount of pigments having a large refractive index or pigments having a high coloring power exhibit a thick cosmetic feeling when applied to the skin, and become opaque. It has the disadvantage of losing its natural feel.

On the other hand, conventionally, in order to impart a sense of transparency and bare skin to the makeup skin, a pigment having a small refractive index such as talc, kaolin, mica, mica, etc., has been blended into a cosmetic as an extender pigment, and The extender pigment has been blended in a large amount in cosmetics because of its superior usability such as spreading and sticking compared to the coloring pigments described above. However, when a large amount of such an extender is blended, the appearance of the extender tends to give an unnatural luster when applied to skin, and the surface of these extender is coated with an inorganic silicate compound. (JP-A-60-228406), and coated with an acrylic resin (JP-A-61-228406).
-69708) and blending the obtained pigment with cosmetics to obtain a transparent feeling, a bare skin feeling and a natural finish.

However, when a cosmetic containing the above-mentioned extender pigment, an inorganic silicate compound-coated extender pigment, an acrylic resin-coated extender pigment, or the like is applied to the skin, the transparent and bare skin feeling can be imparted, but the material itself is refracted. Since the pigment has a low ratio, the covering power is insufficient, and it has a drawback that the original function of the cosmetic, which hides the color unevenness such as spots and freckles existing on the skin, cannot be sufficiently exhibited.

That is, in cosmetics using conventional extender pigments and coloring pigments, transparency and bare skin feeling are imparted and stains existing on the skin are removed.
It has been considered impossible to simultaneously satisfy both the uneven color cover such as freckles and the like, and there has been a long-awaited need for the development of pigments and cosmetics that can achieve this.

[Means for solving the problem]

Thus, the present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, using a coated pigment having high scattering transmittance and total transmittance under specific conditions, has a good transparency and bare skin feeling, In addition, they have found that a cosmetic excellent in the effect of making color unevenness existing on the skin difficult to see can be obtained, and have completed the present invention.

That is, the present invention relates to a plate-like barium sulfate powder whose surface is coated with a methyl methacrylate / styrene copolymer, wherein dimethylpolysiloxane (1000
cs) a pigment having a scattered transmittance of 70% or more and a total transmittance of 85% or more when a 25 μm-thick thin film is formed at a coating powder concentration of 20% by weight using cs); The coated pigment of the present invention has a high total transmittance, so that the reflected scattered light is small, while a large scattered transmittance increases the transmitted scattered light. However, the light transmitted through the pigment is scattered, so that the underlayer is blurred, making it difficult to see. Since no such action is known for conventional pigments, the present inventors have named this action a sharpness suppressing effect.

The coated pigment of the present invention has a powder concentration of 20% by weight and a thickness of 25 μm.
It is necessary that the scattered transmittance when forming a thin film of is 70% or more and the total transmittance is 85% or more. When the scattered transmittance is less than 70%, it is difficult to see color unevenness. The effect is insufficient, and if the total transmittance is less than 85%, the transparency becomes poor. Here, the total transmittance and the scattering transmittance are measured in accordance with JIS standard 7105 based on ASTM standard D-1003 using dimethylpolysiloxane (1000 cs) as a dispersion medium.

The powder used as the base of the coated pigment of the present invention is plate-like barium sulfate, and among them, the so-called plate-like barium sulfate is preferable in terms of the direct attachment to the skin and the feel. The plate-like barium sulfate has an average particle diameter of 1 to 30 μm. For example, plate-like barium sulfate H (average particle diameter 6.3 μ, manufactured by Sakai Chemical Industry Co., Ltd.), sedimentable barium sulfate D-2 [average Particle size 1.1
μ, manufactured by Nippon Chemical Industry Co., Ltd.]. In addition, although these are all amorphous plate-like crystals, the aspect ratio (average diameter / thickness of the plate-like surface) is 3 to 3.
If the ratio of the square of the perimeter of the plate-shaped surface to the area of the orthogonal projection of the plate-shaped surface is 20 to 150, a butterfly shape is exhibited, and the barium sulfate crystal (020) and (020) Two
Twin plate-like barium sulfate having a (00) plane diffraction peak ratio of 1.5 to 100 can also be used. The twin plate-like barium sulfate has a concentration of, for example, Ba ²⁺ ions and SO ₄ ^2- ions in reacting a barium salt solution and a sulfuric acid solution of 0.01 to 0.05 mol /.
The synthesis can be carried out under such conditions that the reaction temperature is 50 to 100 ° C.

The average particle size (based on laser diffraction scattering method) of the plate-like barium sulfate is preferably 0.1 to 50 μm, particularly preferably 1 to 20 μm.
In particular, when used in cosmetics, if the average particle size exceeds 50μ, uncomfortable feeling is apt to occur in terms of feel at the time of use.

The synthetic organic polymer that is the coating applied to the coated pigment is a methyl methacrylate / styrene copolymer, and the coating amount is arbitrarily selected according to the intended sharpness suppressing effect. 0.01 to 90
% By weight, especially 5 to 50% by weight (hereinafter simply indicated by%) is preferred.

The coated pigment of the present invention is produced by a usual coating treatment technique, for example, the following method.

The above synthetic organic polymer is dissolved in a good solvent such as benzene and toluene, and the above powder is stirred and dispersed therein, and then a poor solvent such as methanol and hexane is added to the above powder surface to form the above powder. Is precipitated, filtered, washed and dried to obtain a coated pigment.

The above synthetic organic polymer is dissolved in a good solvent such as dichloromethane or toluene, and the above powder is stirred and dispersed therein. Thereafter, the good solvent is distilled off to obtain a coated pigment.

The coated pigment thus obtained can be widely used in the fields of paints, inks, etc. in addition to cosmetics, but when it is incorporated into cosmetics, it is present on the skin while having a clear and bare skin feeling. It is possible to obtain a cosmetic having an effect of suppressing sharpness that makes color unevenness such as stains and freckles difficult to see.

Examples of the cosmetics of the present invention include makeup cosmetics such as foundation, powdered masonry, solid moisturized, blusher, eye shadow, lipstick, eyeliner, and the like, and creams, basic cosmetics such as emulsions, and the like. Is widely applicable such as powder, cake, emulsifier, oil, and gel.

The amount of the coated pigment to be added to the cosmetic of the present invention is arbitrarily selected according to the properties of the cosmetic.
00%, especially 10-99%, is preferred.

In the cosmetic of the present invention, besides the coated pigment of the essential component, if necessary, various oils, surfactants, other powders, water-soluble polymers, preservatives, drugs as long as the effects of the present invention are not impaired Raw materials generally used in cosmetics, such as pigments, fragrances, humectants, UV absorbers, and water can be added. Examples of oils include liquid paraffin, vaseline, paraffin wax, squalane, beeswax, carnauba wax,
Oils commonly used in cosmetics such as olive oil, lanolin, higher alcohols, fatty acids, and synthetic ester oils of higher alcohols and fatty acids are used. As the surfactant, for example, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, poly Nonionic surfactants such as oxyethylene sorbitol fatty acid esters; anionic surfactants represented by fatty acid soaps such as sodium stearate and triethanolamine palmitate; and cationic surfactants and amphoteric surfactants are widely used in cosmetics. Surfactants are used. Examples of the water-soluble polymer include carboxymethylcellulose, methylcellulose, hydroxymethylcellulose,
Water-soluble polymers commonly used in cosmetics such as polyvinyl alcohol, polyvinyl pyrrolidone, tragacanth gum, carrageenan, locust bean gum, dextrin, dextrin fatty acid ester, carboxyvinyl polymer, xanthan gum, gelatin, sodium alginate, and gum arabic are used. Examples of humectants include sorbitol, isoprene glycol (Kuraray), xylitol, glycerin, maltitol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, sodium pyrrolidonecarboxylate, lactic acid, sodium lactate, and polyethylene glycol Moisturizers commonly used in cosmetics such as are used. As preservatives, for example, alkyl paraoxybenzoate, sodium benzoate,
Preservatives commonly used in cosmetics such as potassium sorbate are used. As the drug, for example, drugs commonly used in cosmetics such as vitamins, crude drugs, anti-inflammatory agents, bactericides and the like are used. Other powders include, for example, talc, mica, kaolin, sericite, muscovite, synthetic mica, phlogopite, phlogopite,
Biotite, lithia mica, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate,
Calcium silicate, aluminum silicate, barium silicate, strontium silicate, metal tungstate, hydroxyapatite, hydrous silicic acid, anhydrous silicic acid, magnesium oxide,
Inorganic powders such as bentonite, zeolite, ceramic powder, barium sulfate, aluminum oxide, aluminum hydroxide, and boron nitride, nylon powder, polyethylene powder, polymethylbenzoguanamine powder, methacrylate powder, ethylene tetrafluoride powder, microcrystalline cellulose, Organic powders such as rice starch and lauroyl lysine; activator metal salt powders such as calcium stearate, zinc stearate, magnesium stearate, magnesium myristate, calcium cetyl phosphate, sodium zinc cetyl phosphate, titanium oxide, zinc oxide,
Zirconium oxide, iron oxide (Bengara), iron titanate,
Inorganic colored powders such as iron hydroxide, ocher, black iron oxide, carbon black, mango violet, cobalt violet, chromium oxide, cobalt titanium, ultramarine, navy blue, etc., titanium oxide coated mica, titanium oxide coated bismuth oxychloride, bismuth oxychloride And pearl pigments such as titanium oxide-coated talc, fish scale foil, and colored titanium oxide-coated mica, and metal powder pigments such as aluminum powder, stainless steel powder, and copper powder. As the pigment, Red No. 3, Red No. 104, Red No. 106,
Red 201, Red 202, Red 204, Red 205, Red 22
0, red 226, red 227, red 228, red 230,
Red 401, Red 505, Yellow 4, Yellow 5, Yellow 202
No. Yellow No. 203, Yellow No. 204, Yellow No. 401, Blue No. 1, Blue No. 2, Blue No. 201, Blue No. 404, Green No. 3, Green No. 201
No., green No. 204, green No. 205, orange No. 201, orange No. 203, orange No. 204, orange No. 206, orange No. 207, etc. And zirconia, barium, or aluminum lake organic pigment powders. As the ultraviolet absorber, a para-aminobenzoic acid-based ultraviolet absorber,
Examples include anthranilic acid-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers, and benzophenone-based ultraviolet absorbers.

The cosmetic of the present invention can be produced according to a conventional method except that the above-mentioned coated pigment is blended.

〔Example〕

Next, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.

Production Example 1 100 cc of toluene was placed in a beaker and 4 g of methyl methacrylate / styrene (4/6) copolymer (molecular weight: about 80,000) was added.
And dissolve with stirring. 20 g of commercially available plate-like barium sulfate (plate-like barium sulfate H, average particle size 6.3 μ, irregular plate shape, manufactured by Sakai Chemical Industry Co., Ltd.) was added and thoroughly dispersed with a homomixer. Was added dropwise. Thereafter, washing and decantation were performed several times with the same amount of n-hexane to remove toluene, followed by filtration, drying and sieving to obtain a coated pigment.

Test Example 1 Dimethyl silicone oil (KF, manufactured by Shin-Etsu Chemical Co., Ltd.)
-96-1000CS), and the sample powder is kneaded with a Hoover muller and uniformly dispersed (concentration 20).
%). Using a baker applicator, a thin film having a thickness of 25 μm is formed on a transparent glass plate. Using this as a sample, the scattering transmittance (H) was measured. The measuring instrument measures the total transmittance (Tt) and diffuse transmittance (Td) using a reflection / transmittance meter HR-100 manufactured by Murakami Color Research Laboratory, and from these, the scattered transmittance (H = Tt / Td). I asked. The results are shown in Table 1.

From Table 1, it can be seen that the coated pigment of the present invention has a higher scattering transmittance and a higher total transmittance than any of the commercially available pigments, and thus has high transparency and a large sharpness suppressing effect.

Production Example 2 100 cc of dichloromethane was placed in an eggplant-shaped flask, and 4 g of methyl methacrylate / styrene copolymer was added and dissolved by stirring. 20 g of commercially available barium sulfate (precipitable barium sulfate D-2, average particle size 1.1 μm, Nippon Chemical Industry) was added thereto, and sufficiently dispersed by a homomixer. Then, the pressure was reduced while stirring using a rotary evaporator. The dichloromethane was distilled off. After drying, it was sieved to obtain a coated pigment.
It had a total transmittance of 85.73% and a scattered transmittance of 74.7%.

Example 1 Powder foundation Composition (%) Mica Remaining amount Pigment of Production Example 1 50 Talc 20 Titanium oxide 10 Bengala 0.8 Yellow iron oxide 2.5 Black iron oxide 0.1 Liquid paraffin 8 Beeswax 2 Preservatives Appropriate amount of perfume Minute total 100 Production method Is mixed and crushed. This is transferred to a high-speed blender, and a mixture obtained by mixing and dissolving the components at 80 ° C. is added and uniformly mixed. The components are added to the mixture, mixed, crushed again and passed through a sieve. This is compression molded into a metal plate.

Example 2 Powder foundation The amount of the components of Example 1 was reduced to 10%. Example 3 Powder foundation The amount of the components of Example 1 was increased to 80%, and the components and the components were removed. Example 4 Powder foundation Ingredient of Example 1 was replaced with that obtained in Production example 2 Comparative example 1 Powder foundation Composition (%) Mica Remaining Commercially available barium sulfate 50 talc 20 Titanium oxide 10 Bengala 0.8 Yellow iron oxide 2.5 Black Iron oxide 0.1 Liquid paraffin 8 Beeswax 2 Preservatives Appropriate amount of perfume Trace amount total 100 Production method This is transferred to a high-speed blender, and a mixture obtained by mixing and dissolving the components at 80 ° C. is added and uniformly mixed. The components are added to the mixture, mixed, crushed again and passed through a sieve. This is compression molded into a metal plate.

Comparative Example 2 Powder Foundation Composition (%) Mica Remaining Nylon Powder 10 Talc 20 Titanium Oxide 10 Bengala 0.8 Yellow Iron Oxide 2.5 Black Iron Oxide 0.1 Liquid Paraffin 8 Beeswax 2 Preservatives Appropriate Perfume Minor Total 100 Production Method I do. This is transferred to a high-speed blender, and a mixture obtained by mixing and dissolving the components at 80 ° C. is added and uniformly mixed. The components are added to the mixture, mixed, crushed again and passed through a sieve. This is compression molded into a metal plate.

Test Example 2 Examples 1, 2, and 3 for Comparative Examples 1 and 2 were carried out by 14 expert panelists according to the following criteria for the following items.
And 4 cosmetics were evaluated. The results are shown in Table 2 by summing up all the evaluation scores of 14 panelists.

<Item> Item 1: Difficulty of seeing spots and freckles Item 2: Fineness of texture Item 3: Bare skin feeling Item 4: Covering power <Evaluation score> As is evident from Table 2, it was confirmed that when the cosmetic of the present invention was applied to the skin, color unevenness such as spots and freckles became difficult to see due to the effect of suppressing the sharpness of the blended coated pigment. In addition, it has been clarified that it is possible to simultaneously satisfy the bare skin feeling and the covering power, which cannot be satisfied at the same time with the conventional cosmetics, such as the fineness of the texture representing the texture of the skin is also felt.

Example 5 Solid Whitening Composition (%) Mica Residual Pigment of Production Example 1 50 Talc 20 Titanium Oxide 0.5 Bengala 0.1 Yellow Iron Oxide 0.1 Black Iron Oxide 0.01 Liquid Paraffin 8 Beeswax 2 Preservatives Appropriate Perfume Minute Total 100 Preparation Method Is mixed and crushed. This is transferred to a high-speed blender, and a mixture obtained by mixing and dissolving the components at 80 ° C. is added and uniformly mixed. The components are added to the mixture, mixed, crushed again and passed through a sieve. This is compression molded into a metal plate.

Example 6 Powdery powder composition (%) Mica remaining amount Pigment of Production Example 1 50 Talc 20 Titanium oxide 0.5 Bengala 0.1 Yellow iron oxide 0.1 Black iron oxide 0.01 Magnesium stearate 10 Preservatives Appropriate amount of perfume Minority total 100 Production method Mix and crush. This is transferred to a high-speed blender, and a component obtained by mixing and dissolving the components at 80 ° C. is added and uniformly mixed, and then pulverized again and passed through a sieve to obtain a product.

Example 7 Creamy Foundation Composition (%) Stearic acid 5.5 Lipophilic glyceryl monostearate 2.5 cetostearyl alcohol 1 Propylene glycol monolaurate 3 Squalane 7 Olive oil 8 Purified water Remaining preservative Appropriate amount Triethanolamine 1.2 Sorbit 3 Titanium oxide 10 Torque 5 Coloring pigment (black iron oxide, red iron oxide, yellowing iron) Proper amount Pigment of Production Example 1 8 Fragrance Trace total 100 Manufacturing method Separately, a solution obtained by mixing the aqueous phase component (1) and (2) is prepared, and the mixture is dispersed by adding a ground pigment, and then heated to 75 ° C. The oil phase component (1) heated and dissolved at 80 ° C. is added to the previously prepared aqueous phase while stirring to emulsify. This is cooled with stirring, the components are added at 50 ° C., and the mixture is cooled with stirring to obtain a product.

Example 8 Blusher Composition (%) Mica Remaining amount Pigment of Production Example 1 50 Talc 20 Titanium oxide 4 Zinc stearate 5 Rice starch 5 Coloring material 3 Liquid paraffin 3 Preservatives Appropriate amount of perfume Minor total 100 Manufacturing method , To color. Next, the components are sprayed and added in a mixer, mixed uniformly, passed through a sieve, and then compressed and hardened into a metal plate using a press.

Example 9 Eye shadow composition (%) Mica residual amount Pigment of Production Example 1 50.0 Talc 5.0 Mica titanium 5.0 Zinc stearate 5.0 Zinc laurate 3.0 Color pigment (black iron oxide, red iron oxide, yellow iron) 10.0 Liquid paraffin 7.5 preservative Appropriate amount of fragrance A small amount of total 100 Production method Ingredients are mixed and spread. Next, the components are sprayed and added in a mixer, mixed uniformly, passed through a sieve, and then compressed and hardened into a metal plate using a press.

Example 10 Lipstick composition (%) Titanium oxide 1.0 Red 201 No. 1.0 Red 202 No. 2.0 Yellow No. 4 Aluminum rake 1.0 Red No. 223 0.1 Pigment of Production Example 1 5.0 Castor oil 46.9 Octyldodecanol 15.0 Lanolin 5.0 Liquid lanolin 5.0 Beeswax 5.0 Ozokerite 4.0 Candelilla wax 7.0 Carnauba wax 1.0 Antioxidant Appropriate amount Preservative Appropriate amount Flavoring amount Minor total 100 Production Method Heat and melt the ingredients to mix uniformly. to this~
After kneading and uniformly dispersing with a roll mill, re-melt and add-, defoaming, pour into a mold and quench to solidify. Remove the solidified material from the mold and load into a container. Next, adjust the appearance of the stick and pass it through the flame to make the surface uniform.

Example 11 Eyeliner Composition (%) Carnauba Wax 5.0 Beeswax 1.0 Microcrystalline Wax 10.0 White Vaseline 1.0 Light Liquid Isoparaffin 67.5 Organic Bentonite 0.5 Pigment of Preparation Example 1 10.0 Titanium Oxide 3.0 Carbon Black 2.0 Preservatives Appropriate Total 100 A part of the manufacturing method While dispersing and gelling through a colloid mill while mixing and heating, dissolving by heating, adding and cooling, kneading with a roll mill, heating again and melting, while the bentonite gel and the remaining And cool with stirring.

Example 12 O / W type cream Composition (%) Beeswax 5.5 Cetanol 4.5 Hydrogenated lanolin 7 Squalane 33 Fatty acid gericerin 3.5 Lipophilic glyceryl monostearate 2 Polyoxyethylene sorbitan monolaurate (20E.O) 2 Production example 1 pigment 8 perfume 0.1 preservative 0.2 antioxidant 0.1 propylene glycol 10 purified water Balance total 100 preparation components ,, and were mixed by stirring, kept at 80 ° C.. The other components are mixed and dissolved by heating to 80 ° C. The above-mentioned aqueous phase is added to the oil phase, preliminarily emulsified, uniformly emulsified by a homomixer, and cooled to 30 ° C. to obtain a product.

〔The invention's effect〕

The coated pigment of the present invention has a completely new optical effect, that is, a sharpness-suppressing effect, which has not been achieved with conventional pigments. Cosmetics containing this have a good transparency and bare skin feeling and a color such as spots and freckles. It is an excellent cosmetic that satisfies uneven coverage at the same time.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Yasuda 9-18 Tsuda Kitamachi, Kaizuka City, Osaka (56) References JP-A-61-129107 (JP, A) Tokiko Sho 60-5623 (JP, B1)

Claims (2)

(57) [Claims] 1. A plate-like barium sulfate powder having a surface coated with a methyl methacrylate / styrene copolymer,
When a thin film having a coating powder concentration of 20% by weight and a thickness of 25 μm is formed using dimethylpolysiloxane (1000cs) as a dispersion medium, the scattering transmittance is 70% or more, and the total transmittance is 85%.
% Pigment. 2. A cosmetic comprising the pigment according to claim 1.