JP2010138150A - Composite emulsion type external preparation for skin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for enhancing the percutaneous absorption of pantetheine-S-sulfonic acid and/or its salt. <P>SOLUTION: The external preparation for the skins comprises (1) an organic modified clay mineral and (2) a water-soluble copolymer, wherein the outermost phase is an aqueous phase and contains (3) pantetheine-S-sulfonic acid and/or its salt. The emulsifier type is preferably a composite emulsifier type, and the water-soluble copolymer is preferably a polypropylene glycol copolymer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a skin external preparation such as cosmetics, and more particularly to a composite emulsion type skin external preparation.

  Pantethein-S-sulfonic acid and / or a salt thereof is a material useful as a cosmetic material having both an excellent whitening effect and a cell inactivating effect (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). It is widely used in the cosmetics field. On the other hand, since it has a sulfonic acid group, there is a highly hydrophilic portion, which impairs percutaneous absorption and the like, and it is said that an effect that should be originally expressed is not expressed. Under such circumstances, studies have been conducted to enhance percutaneous percutaneous absorption of pantethein-S-sulfonic acid and / or a salt thereof. It has been proposed (see, for example, Patent Document 4). However, it is difficult to blend such macromolecules into cosmetics, and it has not been put into practical use.

  In general, for the promotion of such transdermal absorption, for example, there is a method using a transdermal absorption enhancer such as menthol, Azone, and phospholipid. It is well known that it is confined to drugs. There are other methods of inclusion in the inner aqueous phase of phospholipid globules, but the sulfonic acid group has an affinity for phosphorylcholine residues and has difficulty in release.

  On the other hand, organically modified clay minerals are known to have an oil phase thickener, a water-in-oil emulsifier-type stabilizing action resulting from the thickening action, and the like (for example, Patent Document 5, Patents). Reference 6). In addition, water-soluble copolymers such as 1,1′-methylene-bis (4-isocyanatocyclohexane) / polypropylene glycol copolymer have excellent film-forming properties and have an effect of imparting firmness to hair and skin. It is known (see, for example, Patent Document 7 and Patent Document 8). However, it is not known at all that such a component is used in a complex emulsification system, and it is not known at all that when used in an emulsification system, the effect of improving the stability of emulsion droplets is exhibited. By using such an action, a stable emulsifier form in which the aqueous phase is a continuous phase (outermost phase) and oil droplets and a water-in-oil emulsion are dispersed in the continuous phase may be obtained. Not known at all. It is not known at all that the percutaneous absorption of pantethein-S-sulfonic acid and / or a salt thereof can be improved by combining such an emulsifier form with pantethein-S-sulfonic acid and / or a salt thereof.

JP 2005-139070 A JP 09-59142 A JP 09-110645 A JP 2001-506649 A JP 2008-247785 A JP 2005-200329 A JP 2004-75572 A JP 2005-281142 A

  The present invention has been made under such circumstances, and an object of the present invention is to provide means for enhancing percutaneous percutaneous absorption of pantethein-S-sulfonic acid and / or a salt thereof.

In view of such a situation, the present inventors have sought for means for enhancing percutaneous absorption of pantethein-S-sulfonic acid and / or its salt, and as a result of intensive research efforts, 1) organic modification An emulsifier-type skin external preparation containing a clay mineral and 2) a water-soluble copolymer, which is incorporated into a composite emulsifier form in which the outermost phase is an aqueous phase, thereby allowing pantethein-S-sulfonic acid and / or Alternatively, the inventors have found that the percutaneous absorbability of the salt is remarkably improved and have completed the invention. That is, the present invention is as follows.
<1> 1) An emulsifier type skin external preparation containing 1) an organically modified clay mineral, 2) a water-soluble copolymer, wherein the outermost phase is an aqueous phase, and 3) pantethein-S-sulfonic acid and A skin external preparation characterized by containing a / or salt thereof.
<2> The skin external preparation according to <1>, wherein the emulsifier form is a composite emulsifier form.
<3> The skin emulsifier according to <1> or <2>, wherein the complex emulsifier form is prepared by mixing an oil-in-water emulsifier form prepared in advance with a water-in-oil emulsifier form. Agent.
<4> The water-soluble copolymer is a 1,1′-methylene-bis (4-isocyanatocyclohexane) / polypropylene glycol copolymer, wherein any one of <1> to <3> The external preparation for skin according to Item.
<5> The skin external preparation according to any one of <1> to <4>, wherein the water-soluble copolymer is present in the oil phase without coexisting with the organically modified clay mineral. .
<6> The skin external preparation according to any one of <1> to <5>, further comprising fatty acid soap and hydroxylated lecithin as an emulsifier.
<7> An alkali is added to the oil phase containing a water-soluble copolymer and a fatty acid to create a mixed phase of soap and oil phase, and then an aqueous phase containing hydroxide lecithin is added to form an oil-in-water emulsion. Thereafter, a water-in-oil emulsion containing an organically modified clay mineral containing pantethein-S-sulfonic acid and / or a salt thereof prepared in advance was added, and the aqueous phase was made a continuous phase (outermost phase). The method for producing an external preparation for skin according to <6>, wherein an emulsifier form in which oil droplets and a water-in-oil emulsion are dispersed in a continuous phase is prepared.

  According to the present invention, a means for enhancing percutaneous percutaneous absorption of pantethein-S-sulfonic acid and / or a salt thereof can be provided.

<1> Organic modified clay mineral which is an essential component of the external preparation for skin of the present invention The external preparation for skin of the present invention contains an organic modified clay mineral as an essential component. In the organically modified clay mineral, organically modified means that a part of the organic compound is bonded to a part of the clay mineral to form a strong or loose bond through a covalent bond or an ionic bond. This means that a part or all of the mineral is imparted to the clay mineral. Examples of such modifications include a method of bonding a quaternary amine group and an anion portion of the clay mineral, a method of bonding a carboxyl group and a cation portion of the clay mineral, etc. And a method of binding a quaternary amine group and an anion portion of a clay mineral is particularly preferable.

  Although it does not necessarily limit as a compound which has a quaternary amino group which modifies a clay mineral, The compound called quaternium is illustrated. Quotanium is a low molecular weight substituted quaternary ammonium salt, and is preferably a cosmetic raw material registered in International Standard Cosmetic Ingredients (INCI). Furthermore, the compound having a quaternary amino group that modifies the clay mineral is preferably a quaternium compound contained in a conventional external skin preparation among quaternium compounds. Preferred examples of the quaternium compound used in conventional external preparations for skin include stearyl trimethyl ammonium chloride and dimethyl distearyl ammonium chloride. Stearyl trimethyl ammonium chloride, dimethyl distearyl ammonium chloride and the like are preferable because they can form a stable water-in-oil emulsion structure together with clay minerals.

  On the other hand, as a clay mineral (unmodified clay mineral) modified with a compound having a quaternary amino group, any clay mineral contained in a conventional skin external preparation can be used without any particular limitation. Preferred clay minerals contained in conventional skin external preparations include smectite-type hectorite, bentonite and montmorillonite; kaolinite; illite; marine clay mineral (sea mud); desert rose clay mineral; Among these, bentonite, hectorite, montmorillonite or kaolinite which can stabilize the water-in-oil emulsion structure is preferably exemplified.

An example of a method for producing a clay mineral modified with a compound having a quaternary amino group contained in the external preparation for skin of the present invention will be described below.
The unmodified clay mineral is dispersed in a dispersion medium. The dispersant is preferably an aqueous solvent, and may be water. A compound having a quaternary amino group is further added to the dispersion containing the dispersed unmodified clay mineral and stirred well. The compound having a quaternary amino group may be added after being dissolved in water. The amount of the compound having a quaternary amino group to be added is preferably 0.1 to 20% by mass, and more preferably 0.5 to 15% by mass with respect to the amount of the dispersed unmodified clay mineral. This is because by taking such a configuration, a preferable feeling of use is exhibited in the emulsification system. After stirring, the dispersoid is filtered, dehydrated and dried to obtain the modified clay mineral in the present invention. Or the modified clay mineral in this invention can also be obtained by removing a dispersing agent by concentrating under reduced pressure without filtering a dispersoid, and making it dry. The obtained modified clay mineral is preferably pulverized to a desired size (preferably having a particle size of 1 to 1000 μm) and contained in the skin external preparation of the present invention.

  The modified clay mineral in the present invention can be prepared and used as described above, but commercially available ones can also be used. Some modified clay minerals on the market are used as external preparations for skin such as cosmetics. Preferable examples of commercially available modified clay minerals include dimethyl distearyl ammonium modified hectorite sold under the name “Benton 38V” by Elementis.

  In the external preparation for skin of the present invention, such components are preferably contained in an amount of 0.5 to 10% by mass, more preferably 1 to 5% by mass, based on the total amount of the water-in-oil emulsion composition. The total amount of the external preparation for skin is preferably 0.01 to 1% by mass, more preferably 0.05 to 0.5% by mass. Such components serve as an emulsifier within the above-mentioned content range to form a high internal phase water-in-oil emulsion composition. Even when such a water-in-oil emulsified composition is dispersed in an aqueous phase, the change in emulsification status and emulsion stability is remarkably small.

<2> Water-soluble copolymer which is an essential component of the external preparation for skin of the present invention The external preparation for skin of the present invention contains a water-soluble copolymer as an essential component. Here, the water-soluble copolymer is obtained by copolymerizing two or more kinds using vinyl compounds such as acrylic acid, methacrylic acid, esters thereof, amides, styrene, vinyl alcohol, ethers thereof and esters as constituent monomers. Means a copolymer having a hydrophilic portion such as polyether as a structure that imparts water solubility, and includes a polyethylene glycol residue, a polypropylene glycol residue, and a polyglycerin. Preferable examples include a residue, an acrylic acid polymer substrate, a glyceryl group bonded to a methacrylic acid polymer substrate, and a glycol residue. Specifically, polyglucosyloxyethyl methacrylate, polymethacryloyloxyethyl phosphorylcholine, 1,1′-methylene-bis (4-isocyanatocyclohexane) / polypropylene glycol copolymer, glyceryl-N- (2-methacryloyloxyethyl) Preferred examples include carbamate / stearyl methacrylate copolymer, polyvinyl alcohol, and the like. 1,1′-methylene-bis (4-isocyanatocyclohexane) / polypropylene glycol copolymer, glyceryl-N- (2-methacryloyloxyethyl) A carbamate / stearyl methacrylate copolymer is particularly preferred. Such a component strengthens the interface existing at the boundary between the oil phase and the aqueous phase, suppresses the coalescence of oil droplets and emulsified droplets, and has an effect of improving the stability of the emulsified system, particularly the composite emulsified system. In order to exert such an effect, it is preferable to contain 0.1 to 10% by mass, and more preferably 1 to 5% by mass of such components with respect to the total amount of the external preparation for skin. .

  Fats such as 1,1′-methylene-bis (4-isocyanatocyclohexane) / polypropylene glycol copolymer, glyceryl-N- (2-methacryloyloxyethyl) carbamate / stearyl methacrylate copolymer A copolymer having solubility is preferably contained in the oil phase, and a non-lipid-soluble copolymer such as polyglucosyloxyethyl methacrylate and polymethacryloyloxyethyl phosphorylcholine is preferably contained in the aqueous phase.

<3> Pantethein-S-sulfonic acid which is an essential component of the external preparation for skin of the present invention The external preparation for skin of the present invention contains pantethein-S-sulfonic acid and / or a salt thereof as an essential component. Panthethein-S-sulfonic acid (hereinafter abbreviated as PSS) is a known compound represented by the following structural formula (1), which is naturally present in ginseng and is a factor that promotes the growth of Bifidobacterium. It is also known to have a whitening effect, a hair-growth effect, and blood circulation promotion that are useful in cosmetics. In the present invention, PSS can be used not only as a free acid but also in a salt form. Examples of the salt include organic acid salts and inorganic acid salts, and alkali metal salts and alkaline earth metal salts are preferable. In particular, the calcium salt form is particularly preferred when blended. In the external preparation for skin of the present invention, PSS and / or a salt thereof are effectively delivered to the dermis, and the effects of the PSS are fully exhibited. In order to express such effects clearly, the PSS and / or salt thereof is preferably contained in a total amount of 0.01 to 5% by mass, more preferably 0%, based on the total amount of the external preparation for skin. 0.05 to 2% by mass. In the skin external preparation of the present invention, such components are preferably contained in the aqueous phase, and particularly preferably contained in the aqueous phase that is not the outermost phase.

<4> External preparation for skin of the present invention The external preparation for skin of the present invention contains the essential components and is in the form of an emulsifier. As the emulsifier form, any of an oil-in-water emulsifier form, a water-in-oil emulsifier form, and a composite emulsifier form can be applied, and a composite emulsifier form is particularly preferable. There are two types of complex emulsifier types: the oil-in-water-in-oil form and the water-in-oil-in-water form, in which the structure of the dispersed droplets of the emulsion itself is complex (dispersed droplet complex type), and the continuous phase is oil. A phase that is a phase, a phase that is an aqueous phase. Therefore, in the external preparation for skin of the present invention, the dispersion droplet diversification type is particularly preferable.

  Disperse droplet composite type composite emulsifier type skin external preparation is an oil-in-water emulsion composition (continuous phase is oil phase) prepared in advance in a continuous phase, or a water-in-oil emulsion composition (continuous phase is an aqueous phase). ) Is gradually added under stirring and then homogenized.

  The dispersion droplet diversification type is prepared by preparing an oil-in-water emulsifier form or a water-in-oil emulsifier form in advance, and adding the water-in-oil emulsion composition or the oil-in-water emulsion composition to this and homogenizing it. I can do it.

  The external preparation for skin of the present invention is a dispersion type diversified composite emulsifier type, in which the aqueous phase is a continuous phase, and oil droplets and water-in-oil emulsified droplets are mixed and dispersed therein. preferable. This is because, in such an emulsifier form, the emulsion droplet stabilizing effect of the water-soluble copolymer, which is an essential component of the external preparation for skin of the present invention, is particularly remarkably exhibited.

  Organic dispersion clay, which is an essential component in the case of the above-mentioned composite emulsifier type of diversified dispersion type, in which the aqueous phase is a continuous phase and oil droplets and water-in-oil emulsified droplets are mixed and dispersed therein The mineral is preferably contained in water-in-oil emulsified droplets dispersed in an aqueous phase that is a continuous phase. Also, in this case, the oil droplets to be dispersed are added to an aqueous phase containing an alkali and pre-dissolved lecithin hydroxide to add an oil phase containing a fatty acid to form an oil-in-water emulsion composition. It is preferable to add a water-in-oil emulsified composition containing minerals and to homogenize and adjust as desired. By adopting such a form, the emulsified droplets, the interface between the oil droplets and the aqueous phase are strengthened, and the emulsion stability is improved.

  In the external preparation for skin of the present invention, optional components usually used in external preparations for skin can be contained in addition to the above components. 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, palm oil, palm oil, liquid Lanolin, hydrogenated palm oil, hydrogenated oil, molasses, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, ibotarou, lanolin, reduced lanolin, hard lanolin, jojoba wax and other oils, waxes; liquid paraffin, squalane, pristane, ozokerite, Hydrocarbons such as paraffin, ceresin, petrolatum, 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 -Le, Isosteari Higher alcohols such as alcohol, behenyl alcohol, octyl decanol, myristyl alcohol, cetostearyl alcohol; cetyl isooctanoate, isopropyl myristate, hexyldecyl isostearate, diisopropyl adipate, sebacic acid Di-2-ethylhexyl, cetyl lactate, diisostearyl malate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol dicaprate, glycerin di-2-heptylundecanoate, glycerin tri-2-ethylhexanoate Synthetic ester oils such as trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentane erythritol tetra-2-ethylhexanoate; dimethylpolysiloxane, methylphenylpoly Chain polysiloxanes such as Loxane and diphenylpolysiloxane; Cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexanesiloxane; Amino-modified polysiloxane, polyether-modified polysiloxane, and alkyl-modified polysiloxane , Oil agents such as silicone oil such as modified polysiloxane such as fluorine-modified polysiloxane; anionic surfactants such as potassium lauryl sulfate and triethanolamine ether alkyl sulfate; stearyltrimethylammonium chloride, benzalkonium chloride, laurylamine Cationic surfactants such as oxides; imidazoline-based amphoteric surfactants (2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc. ), Betaine surfactants (alkyl betaines, amide betaines, sulfobetaines, etc.), and amphoteric surfactants such as acylmethyl taurine; sorbitan fatty acid esters (sorbitan monostearate, sorbitan sesquioleate, etc.), glycerin Fatty acids (such as glyceryl monostearate), propylene glycol fatty acid esters (such as propylene glycol monostearate), hydrogenated castor oil derivatives, glycerin alkyl ethers, POE sorbitan fatty acid esters (POE sorbitan monooleate) , Polysoxyethylene sorbitan monostearate, etc.), POE sorbite fatty acid esters (POE-sorbite monolaurate, etc.), POE glycerin fatty acid esters (POE-glycerin monoisostearate, etc.), POE fatty acid Steals (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE2-octyldodecyl ether, etc.), POE alkylphenyl ethers (POE nonylphenyl ether, 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 sugar fatty acid esters and alkyl glucosides; polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, propylene glycol , Dipropylene glycol, diglycerin, isoprene glyco , 1,2-pentanediol, 2,4-hexanediol, 1,2-hexanediol, 1,2-octanediol, and other polyhydric alcohols; sodium pyrrolidonecarboxylate, lactic acid, lactic acid Moisturizing ingredients such as sodium; 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; Bengara, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, bitumen, titanium oxide, zinc oxide inorganic pigments that may be treated on the surface; titanium mica, fish phosphorus that may be treated on the surface Pale agents such as foil and bismuth oxychloride; red 202, red 228, red 226, yellow 4, blue 404, yellow 5 and red 5 which may be laked Organic pigments such as No. 05, Red No. 230, Red No. 223, Orange No. 201, Red No. 213, Yellow No. 204, Yellow No. 203, Blue No. 1, Green No. 201, Purple No. 201, Red No. 204; Organic powders such as polymethyl methacrylate, nylon powder, organopolysiloxane elastomer; paraaminobenzoic acid UV absorbers; anthranilic acid UV absorbers; salicylic acid UV absorbers; cinnamic acid UV absorbers; Benzophenone UV absorbers; sugar UV absorbers; UV absorption of 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 4-methoxy-4'-t-butyldibenzoylmethane, etc. Agents; lower alcohols such as ethanol and isopropanol; vitamin A or its derivatives, 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-tocopherol, γ-tocopherol, vitamin Preferred examples include vitamin E such as E-acetate, vitamin D, vitamin H, pantothenic acid, panthetin, pyrroloquinoline quinone and the like; antibacterial agent such as phenoxyethanol; clay mineral such as hectorite . Among these, tranexamic acids can be exemplified as particularly preferred components. As tranexamic acids, tranexamic acid, salts of tranexamic acid or alkylamides of tranexamic acid, particularly methylamide, can be preferably exemplified, and the preferred content thereof is 0.1 to 10% by mass based on the total amount of the external preparation for skin. Yes, and more preferably 0.5 to 5% by mass. The external preparation for skin of the present invention obtained by treating these according to a conventional method is applied to cosmetics (including quasi-drugs), external preparations for skin and the like.

  Hereinafter, the present invention will be described in more detail with reference to examples.

The cosmetic of the present invention was produced according to the formulation shown below. That is, each of the ingredients i, b, and c is heated to 80 ° C., and b is gradually added to a while stirring to form a primary emulsified oil-in-water emulsion. In addition, secondary emulsification was carried out to obtain a diversified dispersion diversification type composite emulsifier type in which oil-in-water / water-in-oil mixed. This was stirred and cooled to obtain Cosmetic 1 as the cosmetic of the present invention.

＊中間油中水乳液１

（製法）イ、ロを８０℃で加熱溶解させ、非溶解分を良く攪拌して均一に為し、攪拌下イにロを徐々に加えて、乳化を行い、中間油中水乳液１を得た。
ヨモギ抽出物は日本原産で日本各地に自生するキク科ヨモギ（Artemisia princeps Pampanini）の乾燥物を購入し、作成した。

* Water-in-oil emulsion 1

(Manufacturing method) A and B are heated and dissolved at 80 ° C., the non-dissolved portion is well stirred to make it uniform, and B is gradually added to A while stirring to emulsify to obtain water-in-oil emulsion 1 It was.
Artemisia princeps Pampanini was purchased and made from Artemisia princeps Pampanini, which is native to Japan and native to various parts of Japan.

<Comparative Example 1>
For comparison, Comparative Example 1 in which the organically modified clay mineral was replaced with polyether-modified silicone was produced.

＊中間油中水乳液２

（製法）イ、ロを８０℃で加熱溶解させ、非溶解分を良く攪拌して均一に為し、攪拌下イにロを徐々に加えて、乳化を行い、中間油中水乳液２を得た。

* Intermediate oil-in-water emulsion 2

(Production method) A and B are heated and dissolved at 80 ° C., and the undissolved portion is stirred well to make it uniform. It was.

<Comparative example 2>
For comparison, Comparative Example 2 was prepared by replacing the water-soluble copolymer with water.

＊中間油中水乳液３

（製法）イ、ロを８０℃で加熱溶解させ、非溶解分を良く攪拌して均一に為し、攪拌下イにロを徐々に加えて、乳化を行い、中間油中水乳液３を得た。

* Intermediate oil-in-water emulsion 3

(Manufacturing method) A and B are heated and dissolved at 80 ° C., the non-dissolved content is stirred well to make it uniform, and B is gradually added to A while stirring to emulsify to obtain water-in-oil emulsion 3 It was.

  In the same manner as in Example 1, the cosmetic 2 of the present invention in the form of an oil-in-water simple emulsifier was prepared.

<Test example>
About said cosmetics 1 and 2 and Comparative Examples 1 and 2, the comparative test was done about the anti-inflammatory action and the whitening action. The specimens were cosmetics 1 and 2, Comparative Examples 1 and 2, and water. In other words, five 2cm x 4cm parts were created on the forearm, 0.03mL of each specimen was applied to each part once a day, and each part was irradiated with ultraviolet rays twice the MED once a day for four days. did. At 72 hours after irradiation, the color difference from the surrounding skin was measured with a Konica Minolta color difference meter CR400. The results are shown in Table 3. From this, it can be seen that the external preparation for skin of the present invention suppresses inflammation after irradiation and suppresses enhancement of melanin production. In addition, as the dosage form, a diversified dispersion type composite emulsifier form in which oil droplets and water-in-oil emulsified droplets are dispersed in an aqueous phase is also suitable. This is presumably because such a dosage form improves percutaneous absorption of pantethein-S-sulfonic acid and / or its salt.

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

Claims (7)

1) An emulsifier type skin external preparation containing an organically modified clay mineral and 2) a water-soluble copolymer, wherein the outermost phase is an aqueous phase, and 3) pantethein-S-sulfonic acid and / or its An external preparation for skin, comprising a salt. The skin external preparation according to claim 1, wherein the emulsifier form is a complex emulsifier form. The skin external preparation according to claim 1 or 2, wherein the complex emulsifier form is prepared by mixing a water-in-oil emulsifier form with a previously prepared oil-in-water emulsifier form. The skin according to any one of claims 1 to 3, wherein the water-soluble copolymer is a 1,1'-methylene-bis (4-isocyanatocyclohexane) -polypropylene glycol copolymer. Topical agent. The skin external preparation according to any one of claims 1 to 4, wherein the water-soluble copolymer is present in an oil phase without coexisting with an organically modified clay mineral. Furthermore, fatty acid soap and hydroxylated lecithin are contained as an emulsifier, The skin external preparation in any one of Claims 1-5 characterized by the above-mentioned. An alkali is added to the oil phase containing a water-soluble copolymer and a fatty acid to create a mixed phase of soap and oil phase, and then an aqueous phase containing hydroxylated lecithin is added to form an oil-in-water emulsion. A water-in-oil emulsion containing an organically modified clay mineral containing pantethein-S-sulfonic acid and / or a salt thereof prepared in advance was added, and the aqueous phase was changed to a continuous phase (outermost phase). The method for producing a skin external preparation according to claim 6, wherein an emulsifier form in which oil droplets and a water-in-oil emulsion are dispersed is prepared.