JP2008297238A - Water-in-oil emulsion type powder-containing external preparation for skin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for improving the adhesiveness-maintaining property of a coating film formed on a skin in a water-in-oil emulsion type powder-containing external preparation for the skin. <P>SOLUTION: This water-in-oil emulsion type powder-containing external preparation for the skins is characterized by containing a powder having an N-acylamino acid salt-containing coating layer in an amount of 5 to 50 mass%. The N-acylamino acid salt is preferably aluminum N-lauroyl glutamate and/or aluminum N-stearoyl glutamate. It is preferable to contain an organic-modified clay mineral as an emulsifying component. In addition, it is preferable that an acryl-silicone-based graft copolymer and 12-hydroxystearic acid are contained. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an external preparation for skin, and more particularly to an external preparation for skin containing a powder suitable for cosmetics and the like.

  Makeup cosmetics are cosmetics that make use of the optical effect of colorants such as powders, making it difficult to see unfavorable parts of the skin such as the face, and highlighting areas that are likely to induce good impressions. It is. For this reason, since the effect of the colorant such as powder is clearly manifested, fluctuations in the makeup film of the makeup cosmetics are often led to a significant decrease in the makeup effect. In the makeup cosmetics, it can be said that more than the basic cosmetics, the makeup finish and the maintenance of the adhesion to the skin are required. In other words, the goodness of makeup in makeup cosmetics is an element that defines quality as important as the beauty of the finish immediately after makeup makeup. For this reason, makeup cosmetics engineers have devoted a lot of effort to improving makeup.

  As a result of such efforts, as one important basic technique, there is a technique of blending powder into a water-in-oil emulsifier form having a high content of liquid oily components. With this technology, it is possible to prevent the optical effect of the colorant from being damaged by solid fat, and at the same time to prevent the cosmetic film from collapsing due to aqueous components such as sweat. Improved. Formation of such a water-in-oil emulsion system is highly dependent on the surfactant to be used. For example, a method using a polymer oily structure formed by an acrylic-silicone graft copolymer (for example, Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5), a method using a gel structure made of 12-hydroxystearic acid or 12-hydroxystearic acid polymer (for example, Patent Document 6, Patent Document 7, There is a method using montmorillonite organically modified with a quaternary ammonium compound (for example, Patent Document 9). In order to uniformly disperse the powder in such a water-in-oil emulsifier form, it is required that the powder itself be subjected to a lipophilic surface treatment. As such a lipophilic surface treatment, Usually, baking treatment of hydrogenmethylpolysiloxane or silane coupling treatment with alkylalkoxysilane or the like is performed. However, the film formed on the skin by a water-in-oil emulsifier type skin external preparation containing such a lipophilic powder has a high film maintenance property against aqueous components such as sweat, but it is derived from biological oil such as sebum. For the ingredients, the structure of the film itself is easily broken, and this tendency tends to become more prominent as the surface of the powder is oleophilicized. It was.

  It is already known that living body-derived lipids, especially fatty acids, have a significant effect on cosmetic disintegration, and clay minerals clad with metal ions between layers as powders for trapping such fatty acids (for example, patent documents) 10) and powder coated with hydroxyapatite (see, for example, Patent Document 11 and Patent Document 12) are known. Simply, powder containing such sebum is used as powder-containing water-in-oil. Even if it is blended into an emulsifier-type skin external preparation, adhesion maintenance with the skin is not improved. This is considered because the powder easily moves in the film.

  On the other hand, a technique for coating the surface of a powder with an N-acylamino acid metal salt such as an N-acylamino acid aluminum salt is already known (see, for example, Patent Document 13, Patent Document 14, and Patent Document 15). It was formulated in a state and it was a hydrophilic film when used, and it was used for cosmetics design that changed to a hydrophobic film after application and drying, but such powder does not contain water However, it was not included in the water-in-oil dosage form.

  No skin external preparation in the form of a water-in-oil formulation containing 5 to 50% by mass of a powder having a coating layer containing an N-acylamino acid salt has been known, and the skin external preparation having such a structure is excellent. It has not been known at all that it has adhesion maintenance with the skin.

JP-A-11-349442 JP-A-5-339125 WO 2004/091563 JP 2001-328931 A JP 2004-285013 A JP 9-268120 A JP-A-9-268111 JP 2004-210765 A JP-A-10-194924 Japanese Patent Laid-Open No. 10-87420 JP 2000-212041 A JP 2004-315416 A JP 2001-72527 A JP-A-5-285369 JP-A-5-39436

  The present invention has been made under such circumstances, and in a skin external preparation in the form of a water-in-oil emulsifier containing powder, the skin external preparation improves the adhesion maintenance of the film formed on the skin. This is the issue.

In view of such a situation, the present inventors have developed a technique for improving the adhesion maintenance property of a film formed on the skin by the skin external preparation in a water-in-oil emulsifier type skin external preparation containing powder. As a result of intensive research efforts, the inventors have found that such powder can be improved by using a powder having a coating layer containing an N-acylamino acid salt as a powder to be contained, and the invention is completed. It came. That is, the present invention is as follows.
(1) A skin external preparation in the form of a water-in-oil emulsifier comprising 5 to 50% by mass of a powder having a coating layer containing an N-acylamino acid salt.
(2) The skin external preparation in the form of a water-in-oil emulsifier according to (1), wherein the N-acylamino acid salt is aluminum N-lauroylglutamate and / or aluminum N-stearoylglutamate.
(3) The skin external preparation in the form of a water-in-oil emulsifier according to (1) or (2), which contains an organically modified clay mineral as an emulsifying component.
(4) The skin external preparation in the form of a water-in-oil emulsifier according to any one of (1) to (3), which contains an acrylic-silicone graft copolymer.
(5) The skin external preparation in the form of a water-in-oil emulsifier according to any one of (1) to (4), comprising 12-hydroxystearic acid.
(6) The skin external preparation in the form of a water-in-oil emulsifier according to any one of (1) to (5), comprising poly (12-hydroxystearic acid).
(7) The water-in-oil according to any one of (1) to (6), further comprising 0.01 to 5% by mass of a powder having an action of trapping fatty acids in sebum. Emulsifier type skin external preparation.
(8) The powder having an action of trapping fatty acids in sebum is selected from montmorillonite intercalated with zinc and / or aluminum, zinc oxide, and hydroxyapatite-coated powder. The skin external preparation in the form of a water-in-oil emulsifier as described.

  ADVANTAGE OF THE INVENTION According to this invention, in the skin external preparation of the water-in-oil emulsifier form containing powder, the adhesive maintenance property of the film | membrane which the skin external preparation forms on skin can be improved.

(1) Powder having a coating layer containing an N-acylamino acid salt which is an essential component of the external preparation for skin of the present invention The external preparation for skin of the present invention is a water-in-oil form and contains an N-acylamino acid salt. A powder having a coating layer to be contained is contained as an essential component. Here, the water-in-oil emulsifier form referred to in the present invention is a general term for an emulsion in which the outermost phase is an oil phase, and the water phase is present as droplets in the oil phase. The oil-in-water emulsion forms referred to in the present invention include O / W / O in which oil-in-water emulsions exist as droplets, and composite emulsions in which water-phase drops and oil-in-water emulsion droplets are mixed in the oil phase. Belongs. The powder that is an essential component of the external preparation for skin of the present invention is in a form that is coated with at least an N-acylamino acid salt. The N-acyl amino acid salt preferably has an aliphatic acyl group having 10 to 30 carbon atoms as an acyl group, such as lauroyl group, myristoyl group, palmitoyl group, stearoyl group, isostearoyl group, oleoyl group, and the like. The portion preferably has a lysine residue or a glutamic acid residue, and the salt preferably employs an aluminum salt or a zinc salt. Specific examples include N-lauroyl glutamic acid aluminum salt, N-lauroyl glycine aluminum salt, N-lauroyl glutamic acid zinc salt, N-lauroyl glycine zinc salt, N-stearoyl glutamic acid aluminum salt, N-stearoyl glutamic acid zinc salt and the like. Preferable examples include N-lauroylglutamic acid aluminum salt. For example, in the case of N-acylamino acid aluminum salt coating, for example, N-stearoyl glutamate aluminum coating, powder is dispersed in an aqueous solution of sodium N-stearoyl glutamate, and then aluminum chloride is added to the powder. And an aluminum N-stearoylglutamate solution may be deposited on the powder. The surface treatment is suitably performed with a coating of 1 to 20% of the mass of the powder. Production examples are shown below.

<Production Example 1>
100 g of titanium dioxide was dispersed in 500 ml of 1% sodium N-lauroyl glutamate aqueous solution, 125 ml of 1% aluminum chloride aqueous solution was added thereto, and the mixture was gently stirred for 4 hours to deposit aluminum N-lauroyl glutamate on the titanium dioxide surface. . After completion of the reaction, centrifugation (3000 g, 10 minutes) was performed and the supernatant was discarded. Further, 1000 ml of water was added, stirred, centrifuged, and washed three times. The precipitated powder was dried, crushed with a breaker, and pulverized with a pulverizer equipped with a 1 mm herringbone screen to obtain Powder 1 which was titanium dioxide coated with aluminum N-lauroyl glutamate.

<Production Example 2>
Powder 2 was obtained in the same manner by replacing titanium dioxide with bengara.

<Production Example 3>
Powder 3 was obtained in the same manner by replacing titanium dioxide with yellow iron oxide.

<Production Example 4>
Powder 4 was obtained by replacing titanium dioxide with talc and treating in the same manner.

  In addition to such treatment, the N-acylamino acid salt-coated powder thus obtained is subjected to silylation treatment with a silylating agent such as trimethylmethoxysilane, hydrogenmethylpolysiloxane baking treatment, stearin A fatty acid metal soap coating treatment such as aluminum oxide or a lecithin coating treatment can be performed. Conversely, silylation treatment with a silylating agent such as trimethylmethoxysilane, hydrogenmethylpolysiloxane baking treatment, fatty acid metal soap coating treatment such as aluminum stearate, lecithin coating treatment, etc. The coated powder thus obtained can be used after being subjected to N-acylamino acid treatment as described above. Such a composite-treated powder also belongs to a powder having a coating layer containing the N-acylamino acid salt of the present invention. Some powders that have been subjected to such a composite treatment are already commercially available, and such commercially available products can be purchased and used. Examples of such commercially available products include “SA / NAI-W-10” (titanium dioxide treated with trimethylmethoxysilane and then treated with aluminum N-stearoylglutamate) manufactured by Miyoshi Kasei Co., Ltd., “SA / NAI-R”. -10 "(red bengara treated with trimethylmethoxysilane and then treated with aluminum N-stearoyl glutamate)," SA / NAI-79-P-10 "(purple bengara treated with trimethylmethoxysilane and treated with aluminum N-stearoylglutamate) ), “SA / NAI-Y-10” (yellow iron oxide treated with trimethylmethoxysilane and then treated with aluminum N-stearoylglutamate), and the like.

  The preferable content of the powder having the coating layer containing the N-acylamino acid salt in the external preparation for skin of the present invention is 5% by mass, more preferably 8% by mass, at which the optical effect of the powder becomes clear at the lower limit. And the upper limit is 50% by mass, more preferably 45% by mass, which is the upper limit of the powder dispersion. In the external preparation for skin according to the present invention, by incorporating a powder having a coating layer containing the N-acylamino acid salt into a water-in-oil dosage form, it has good lipophilic surface characteristics, so that it is excellent in the preparation. While exhibiting dispersibility and high affinity between the powder and the skin surface, the powder does not easily move according to the movement of the oil phase. As a result, the adhesion maintenance between the skin and the composition is enhanced, and from the characteristics of the water-in-oil dosage form, it exhibits remarkable resistance against water-based inhibiting factors such as sweat.

(2) External preparation for skin of the present invention The external preparation for skin of the present invention contains a powder having a coating layer containing the N-acylamino acid salt, which is the essential component, and is in the form of a water-in-oil emulsifier. And As the water-in-oil emulsifier form, conventionally known formulation techniques can be applied. That is, a method using a gel structure of montmorillonite and a polyhydric alcohol which is organically modified with a quaternary amine salt such as organically modified hectorite, a water-soluble oily gel structure formed by fat and oil and 12-hydroxystearic acid or a polymer thereof. And a method of stuffing an aqueous phase into a network structure formed by an acrylic-silicone graft copolymer. Even when a plurality of these are combined, a stable water-in-oil emulsion can be formed.

  The method of using montmorillonite organically modified with a quaternary amine salt uses 0.3 to 5% by mass of montmorillonite organically modified with a quaternary amine salt, and a glycerin, 1,3-butanediol or the like. This is a technique of emulsifying a monohydric alcohol or polyalkylene oxide-modified silicone 1 to 10 times its mass as an auxiliary agent. As montmorillonite organically modified with the quaternary amine salt, “Benton 38V” manufactured by Leox Co., Ltd. is used. (Dimethyl distearyl ammonium chloride modified hectorite) can be exemplified as a suitable commercial product.

  The method using 12-hydroxystearic acid or a polymer thereof is 1 to 5% by mass of 12-hydroxystearic acid or a polymer thereof, and optionally 1 to 5 mass by using a fatty acid ester of polyglycerol as an auxiliary. Is a technique for emulsifying. Instead of the polymer of 12-hydroxystearic acid, a poly-12-hydroxystearic acid polyoxyethylene adduct (for example, “Aracel P-135” manufactured by Unikema Co., Ltd.) can be used.

  In the method using an acrylic-silicone graft copolymer, a structure is prepared from 1 to 10% by mass of an acrylic-silicone graft copolymer and an oil phase, and if desired, polyglycerin fatty acid ester or polyoxyalkylene-modified silicone 1 This is a technique for emulsifying by using 10% by mass to 10% by mass as an auxiliary. As such an acryl-silicone graft copolymer, “silicone KP-545” manufactured by Shin-Etsu Chemical Co., Ltd. can be preferably exemplified. Such an acrylic-silicone graft copolymer is also referred to as an acrylic modified silicone.

  In addition, there are water-in-oil emulsification systems formed by combining diglycerin monoesters and triglycerin diesters with sugars such as maltitol and sorbitol, and such water-in-oil emulsification systems are also oils of the present invention. There is no exception to the medium water emulsifier type.

  The topical skin preparation of the present invention can be applied without particular limitation as long as it is externally administered to the skin. For example, cosmetics including quasi-drugs, external medicines for skin, sundries for skin, etc. are suitable. It can be exemplified, and cosmetics can be particularly preferably exemplified. Among them, makeup cosmetics can be particularly suitably exemplified. As makeup cosmetics, under makeup, foundation, cheek color, eye color, mascara, eyeliner, spot cover, highlight and the like can be suitably exemplified. Among these, a foundation having a particularly high cosmetic effect can be particularly preferably exemplified. This is because the optical effect of the powder can be maintained for a long time because the effect of the present invention can be exhibited without regret.

  The external preparation for skin of the present invention can contain optional components that are usually used in external preparations for skin such as cosmetics, in addition to the essential components described above. Such optional ingredients include, for example, macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, safflower oil, cottonseed oil, jojoba oil, coconut oil, palm oil, liquid lanolin, hydrogenated coconut oil Oil, wax, oils such as beeswax, owl, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, ibotarou, lanolin, reduced lanolin, hard lanolin, jojoba wax; liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, petrolatum , Hydrocarbons such as microcrystalline wax; higher fatty acids such as oleic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, undecylenic acid; cetyl alcohol, stearyl alcohol, isostearyl Higher alcohols such as alcohol, behenyl alcohol, octyldodecanol, myristyl alcohol, cetostearyl alcohol; cetyl isooctanoate, isopropyl myristate, hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebacate, cetyl lactate, malic acid Diisostearyl, di-2-ethylhexanoic acid ethylene glycol, dicaprate neopentyl glycol, di-2-heptylundecanoic acid glycerin, tri-2-ethylhexanoic acid glycerin, tri-2-ethylhexanoic acid trimethylolpropane, tri Synthetic ester oils such as trimethylolpropane isostearate and pentane erythritol tetra-2-ethylhexanoate; dimethylpolysiloxane, methylphenylpoly Linear polysiloxanes such as oxane and diphenylpolysiloxane; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexanesiloxane; amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, Oil agents such as silicone oils such as modified polysiloxanes such as fluorine-modified polysiloxanes; Anionic surfactants such as fatty acid soap (sodium laurate, sodium palmitate, etc.), potassium lauryl sulfate, triethanolamine ether of alkyl sulfates; Cationic surfactants such as stearyltrimethylammonium, benzalkonium chloride, laurylamine oxide; imidazoline-based amphoteric surfactants (2-cocoyl-2-imida Zolinium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine surfactants (alkyl betaine, amide betaine, sulfobetaine, etc.), and amphoteric surfactants such as acylmethyltaurine; sorbitan fatty acid esters (sorbitan) Monostearate, sorbitan sesquioleate, etc.), glycerin fatty acids (eg, glyceryl monostearate), propylene glycol fatty acid esters (eg, propylene glycol monostearate), hardened castor oil derivatives, glycerin alkyl ethers, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbite fatty acid esters (POE-sorbitol monolaurate, etc.), POE glycerin fatty acid ester Tells (POE-glycerol monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE2-octyldodecyl ether, etc.), POE alkylphenyl ethers (POE nonylphenyl) Ethers, etc.), Pluronic types, POE / POP alkyl ethers (POE / POP2-decyltetradecyl ether, etc.), Tetronics, POE castor oil / hardened castor oil derivatives (POE castor oil, POE hardened castor oil, etc.), Nonionic surfactants such as sucrose fatty acid ester and alkyl glucoside; polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, propylene Polyhydric alcohols such as recall, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4-hexanediol, 1,2-hexanediol, 1,2-octanediol; sodium pyrrolidonecarboxylate Moisturizing ingredients such as lactic acid and sodium lactate; powders such as mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, anhydrous silicic acid (silica), aluminum oxide, barium sulfate, etc. whose surface may be treated Body, the surface may be treated, inorganic pigments such as bengara, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, bitumen, titanium oxide, zinc oxide; surface may be treated, mica Pearl agents such as titanium, fish phosphorus foil, bismuth oxychloride; red 202 which may be raked, red Color 228, Red 226, Yellow 4, Blue 404, Yellow 5, Red 505, Red 230, Red 223, Orange 201, Red 213, Yellow 204, Yellow 203, Blue 1 No., green 201, purple 201, red 204, etc .; organic powders such as polyethylene powder, polymethyl methacrylate, nylon powder, organopolysiloxane elastomer; para-aminobenzoic acid UV absorbers; anthranils Acid UV absorbers; salicylic acid UV absorbers; cinnamic acid UV absorbers; benzophenone UV absorbers; sugar UV absorbers; 2- (2′-hydroxy-5′-t-octylphenyl) benzo Ultraviolet absorbers such as triazole and 4-methoxy-4′-t-butyldibenzoylmethane; lower grades such as ethanol and isopropanol Alcohols; vitamin A or derivatives thereof, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 or derivatives thereof, vitamin B12 such as vitamin B12, vitamin B15 or derivatives thereof; α-tocopherol, β- Preferred examples include vitamins such as tocopherol, γ-tocopherol and vitamin E acetate, vitamin D acetate, vitamin D, vitamin H, pantothenic acid, panthetin, pyrroloquinoline quinone and the like; and antibacterial agents such as phenoxyethanol.

  Among such optional components, particularly preferred in the external preparation for skin of the present invention is a powder having an action of trapping fatty acids in sebum. Examples of such powder include zinc and / or Alternatively, montmorillonite intercalated with aluminum, zinc oxide, hydroxyapatite-coated powder or the like can be suitably exemplified. The montmorillonite intercalated with zinc and / or aluminum can be produced as in Production Example 5 below, or a commercially available powder can be purchased and used. As such a commercially available powder, “oil sensor powder” manufactured by Daito Kasei Co., Ltd. can be suitably exemplified. As zinc oxide, those usually used in skin external preparations such as cosmetics can be used. If desired, hydrogen methylpolysiloxane baking treatment, silylation treatment with a silylating agent, fatty acid metal soap coating treatment, etc. can be applied to the surface and used, but since the surface treatment is not performed, the sebum trapping effect is higher. preferable. The hydroxyapatite-coated powder can be prepared as in Production Example 6 below, or a commercially available product can be purchased and used. Preferable examples of commercially available products include “Powder La Vi” (hydroxyapatite / zinc oxide-coated sericite) manufactured by Miyoshi Kasei Co., Ltd. Such a powder having an action of trapping fatty acids in sebum can contain a single species or a combination of two or more species. The preferable content of the powder having an action of trapping fatty acids in the sebum is 0.01 to 5% by mass, more preferably 0.05 to 1% by mass based on the total amount of the external preparation for skin. %.

<Production Example 5>
400 ml of 0.4N sodium hydroxide aqueous solution was added dropwise to 300 ml of 0.4M aluminum nitrate aqueous solution and stirred at 60 ° C. for 6 hours to obtain a transparent liquid. To this, 6.67 g of sodium montmorillonite was gradually added, 333 ml of water was added, and the mixture was stirred at room temperature for 2 hours. This was centrifuged at 10,000 rpm for 10 minutes, and the supernatant was discarded. Further, 500 ml was added twice and centrifuged in the same manner to wash insoluble matters. This was freeze-dried to remove moisture. 2 g of this was taken and 40 ml of 0.2 M zinc nitrate aqueous solution was added and dispersed well. To this, 30 ml of 0.4 N sodium hydroxide aqueous solution was added and stirred well, then centrifuged at 10,000 rpm for 10 minutes and the supernatant was discarded. Further, 500 ml was added twice and centrifuged in the same manner to wash insoluble matters. This was freeze-dried to obtain a powder 5 in which zinc and aluminum were intercalated between layers.

<Production Example 6>
85.2 g of diammonium phosphate was dissolved in 4.5 liters of water to form a solution, and 1 kg of sericite was added thereto and dispersed uniformly. Next, with stirring and cooling, aqueous ammonia was gradually added to adjust the pH of the system to 9.0, and a solution prepared by dissolving 156.1 g of calcium nitrate in 500 ml of water was gradually added. After completion of the addition, the mixture was further stirred for 1 hour, and the resulting slurry was centrifuged (3000 g, 10 minutes). The supernatant was discarded, and 2 l of water was added again to disperse, followed by centrifugation and washing. This washing operation was performed three times. Thereafter, the dehydrated powder by centrifugation was dried at a temperature of 110 ° C. to obtain hydroxyapatite-coated (about 2 mass%) sericite (powder 6).

<Production Example 7>
By the same operation as in Production Example 6, the sericite was replaced with mica and treated to obtain hydroxyapatite-coated (about 2% by mass) mica (powder 7).

<Production Example 8>
In the same manner as in Production Example 6, sericite was replaced with talc and treated to obtain hydroxyapatite-coated (about 2% by mass) talc (powder 8).

  The skin external preparation of this invention can be manufactured by processing the essential component and arbitrary component which were illustrated above according to the conventional method. Hereinafter, the present invention will be described in more detail with reference to examples, but it goes without saying that the present invention is not limited to such examples.

  In accordance with the formulation shown below, a foundation (makeup cosmetic), which is an external preparation for skin of the present invention, was prepared. That is, after adjusting the temperature of the components of A, B, and C to 80 ° C. and kneading A, add the component of B and dilute it, add the component of D to this, and disperse it uniformly with a disper. Under stirring, the component C was gradually added to emulsify, and stirred and cooled to obtain a water-in-oil emulsifier type cosmetic 1. Comparative Example 1 in which the powder 1 was replaced with titanium dioxide, the powder 2 with bengara, the powder 3 with yellow iron oxide, and the powder 4 with talc, and the powder 1 was baked with 5% hydrogen methylpolysiloxane. Tungsten dioxide, Bengala powder 5 treated with 5% hydrogenmethylpolysiloxane, powder 3 coated with yellow iron oxide 5% treated with hydrogenmethylpolysiloxane, powder 4 treated with hydrogenmethylpolysiloxane 5 A comparative example 2 in which the baked talc was replaced with a% baking was also produced in the same manner. In Comparative Example 1, there was uneven dispersion of the colorant that could be confirmed with the naked eye immediately after production.

<Test Example 1>
Three parts of 2 cm × 4 cm are provided on the inner side of the upper arm, 40 μl of cosmetic 1 is applied to one part, 40 μl of Comparative Example 1 is applied to one part, and Comparative Example 2 is applied to the remaining part. 40 μl was applied. 15 minutes after application, the Konica Minolta color difference meter CR400 was used to measure the color difference between the site and the standard white plate, and then the normal color was measured for 4 hours, and the color difference from the standard white plate was measured again. From this measurement data, the color difference (ΔE) immediately after the cosmetic application and after 4 hours was calculated. The results are shown in Table 2.

<Test Example 2>
The change conditions of Test Example 1 were changed from normal living conditions of 4 hours to 30 seconds exposure under flowing hot water, and the same examination was performed. The results are shown in Table 3. From this, it can be seen that the silicone treatment shows a remarkable improvement effect on water resistance, but under normal conditions, it does not have the effect of maintaining adhesion as much as water resistance. From this, it is presumed that a factor more than the improvement of the water resistance of the powder exists in the improvement of the adhesiveness maintenance property with the skin. Moreover, it was confirmed that the powder having a coating layer containing an N-acylamino acid salt has water resistance and remarkable adhesion maintenance with the skin even under normal living conditions.

  By operating in the same manner as in Example 1, a cosmetic 2 as an external preparation for skin of the present invention was obtained. When this was evaluated by the method of Test Example 1, it was found that the color difference (ΔE) under exposure under normal conditions for 4 hours was 0.35, and it was preferable to contain a powder having sebum trapping ability.

  According to the formulation shown below, cosmetics 3 to 6 were produced in the same manner as in Example 1. The results of evaluating these cosmetics according to the method of Test Example 1 are shown in Table 6. From this, it is understood that any powder having sebum trapping ability has the effect.

  A cosmetic 7 was prepared in the same manner as in Example 1 according to the following prescription. This product was evaluated in Test Example 1 and the color difference (ΔE) was 0.06.

  In the same manner as in Example 1, cosmetic 8 was prepared according to the following formulation. This product had a color difference (ΔE) of 0.21 in the evaluation of Test Example 1. Furthermore, surprisingly, in the emulsification type foundation, the upper limit value of the powder is said to be about 30% by mass, whereas the powder content of this cosmetic exceeds 40%. When the powder was replaced with hydrogenmethylpolysiloxane-treated powder as in Comparative Example 2, it became solidified during dispersion and became unmanufacturable. The fact that a large amount of powder can be contained is considered to be an effect of the present invention.

  A cosmetic 9 was prepared in the same manner as in Example 1 according to the formulation shown below. This product had a color difference (ΔE) of 0.19 in the evaluation of Test Example 1.

  A cosmetic 10 was prepared in the same manner as in Example 1 according to the formulation shown below. This product had a color difference (ΔE) of 0.24 in the evaluation of Test Example 1.

  The present invention can be applied to skin external preparations such as cosmetics.

Claims (8)

A skin external preparation in the form of a water-in-oil emulsifier comprising 5 to 50% by mass of a powder having a coating layer containing an N-acylamino acid salt. The skin external preparation in the form of a water-in-oil emulsifier according to claim 1, wherein the N-acyl amino acid salt is aluminum N-lauroyl glutamate and / or aluminum N-stearoyl glutamate. The skin external preparation in the form of a water-in-oil emulsifier according to claim 1 or 2, characterized in that it contains an organically modified clay mineral as an emulsifying component. The skin external preparation in the form of a water-in-oil emulsifier according to any one of claims 1 to 3, comprising an acrylic-silicone graft copolymer. The skin external preparation in the form of a water-in-oil emulsifier according to any one of claims 1 to 4, characterized by containing 12-hydroxystearic acid. The skin external preparation in the form of a water-in-oil emulsifier according to any one of claims 1 to 5, comprising poly (12-hydroxystearic acid). Furthermore, 0.01-5 mass% of powder which has the effect | action which traps the fatty acid in sebum is contained, The skin external use of the water-in-oil emulsifier form of any one of Claims 1-6 characterized by the above-mentioned. Agent. The oil according to claim 7, wherein the powder having an action of trapping fatty acids in sebum is selected from montmorillonite intercalated with zinc and / or aluminum, zinc oxide, and hydroxyapatite-coated powder. An external preparation for skin in the form of a medium water emulsifier.