JP2015134748A - Powder composition which contains powder composited with lamellar phase, and method for producing same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder cosmetic which does not give a dry feeling in use and exhibits excellent moisturizing properties.SOLUTION: A powder cosmetic contains, as an ingredient, a powder composition which includes: an oil solution; a surfactant; and a powder base material. The powder cosmetic is characterized in that a surface of the powder base material is composited with a lamellar phase comprising the surfactant as the main component.

Description

  The present invention relates to a powder composition containing a powder in which a lamellar phase is complexed and a method for producing the same.

  Powder cosmetics are superior in portability and convenience compared to liquid cosmetics, but have a problem that they feel dry to the skin when used. Conventionally, in order to solve such problems, a technique of coating powder with an oil has been taken (for example, Patent Document 1).

By the way, in the gap between cells constituting human skin, there is a layered structure called a lamellar phase in which an aqueous phase and an oil phase are repeatedly overlapped. This lamellar phase has a structure in which lipids, which are amphipathic molecules, are regularly arranged. The water phase retains active ingredients such as lactic acid and amino acids to keep the skin moist. The lamellar phase in the skin has a barrier function to protect the skin from harmful substances in the atmosphere.
In recent years, cosmetics applying the active ingredient holding function, moisturizing function, and barrier function of this lamellar phase have been created. For example, Patent Document 2 discloses a humectant containing a lamellar phase and a sucrose fatty acid ester containing fatty acid monoglyceride as components.

JP 2002-284644 A JP 2009-298748 A

  Coating the powder with an oil agent is effective in reducing the feeling of dryness. However, when a large amount of oil is used to improve the moisture retention, there is a problem that stickiness occurs during use. Therefore, there has been a demand for a technique for improving the moisturizing property of the powder cosmetic by a separate method other than increasing the amount of oil used. That is, the problem to be solved by the present invention is to provide a powder composition excellent in moisturizing property that does not cause dryness and stickiness during use.

The present invention for solving the above-mentioned problems comprises a powder comprising an oil agent, a surfactant, and a powder base material, wherein a lamellar phase mainly comprising a surfactant is complexed on the surface of the powder base material. It is a body composition. The powder composing such a powder composition has excellent moisturizing properties because the surface has a lamellar phase.
Here, “composite” means not only a state in which the entire surface of the powder base material is coated with a lamellar phase, but also a state in which the lamellar phase is partially adhered.
Further, in this specification, the powder composition refers to a mixed composition of powder and other components.

In a preferred embodiment of the present invention, the oil agent is selected from silicone oil, hydrocarbon oil, ester oil, natural animal and vegetable oil, and fluorine oil.
By using these oil agents, the moisture retention of the powder composition is improved.

In a preferred form of the invention, the powder composition contains water.
Since the lamellar phase can retain moisture in the hydrophilic layer, by combining it with the powder base material in the oil agent, moisture and oil can coexist and the dry feeling during use is suppressed. Can moisturize the skin.

When the powder composition contains water as described above, a water-soluble active ingredient may be included.
In this case, the hydrophilic active ingredient is taken into the layer in which the water in the lamellar phase is retained. By setting it as such a form, a powder composition becomes the outstanding thing which exhibits the effect which the active ingredient has other than moisture retention. Specifically, the powder composition of the present invention having such a form can enhance the effect of the active ingredient by efficiently infiltrating the active ingredient into the stratum corneum.

  In the present invention, the surfactant is not particularly limited. For example, when the powder composition of the present invention is applied as a cosmetic ingredient, lecithin and / or a nonionic surfactant are preferably mentioned. Since the lamellar phase composed of these oil agents is more stable, it is possible to provide a powder cosmetic that maintains high moisture retention for a long time.

The present invention also relates to an external preparation for skin containing a powder composition.
Such an external preparation for skin has excellent moisturizing properties and can retain a water-soluble active ingredient in the lamellar phase, and therefore has an excellent skin care effect.

The present invention also relates to a method for producing the above powder composition, characterized in that a lamellar phase mainly composed of a surfactant in an oil agent is compounded on the surface of a powder base material.
According to the production method of the present invention, the powder composition of the present invention can be produced.

Moreover, according to a preferable form, the manufacturing method of the powder composition of this invention includes the process of mixing an oil agent, surfactant, and a powder base material.
According to this form, the powder composition of the present invention can be produced efficiently.

According to the more preferable form of the manufacturing method of this invention, the process which mixes an oil agent and surfactant and obtains a lamella phase dispersion solution, and the process which mixes the said lamella phase dispersion solution and a powder base material are included.
According to the production method including the above steps, the powder base material of the present invention can be produced efficiently and simply.
Hereinafter, the manufacturing method of the present invention in this form is referred to as a dry manufacturing method.

Further, according to a preferred embodiment different from the dry production method, the production method of the present invention comprises a step of mixing an oil agent, a surfactant, a volatile solvent, and a powder base material to obtain an intermediate powder composition; Volatilizing the volatile solvent in the intermediate powder composition.
According to the manufacturing method including the above steps, the powder composition of the present invention including a powder base material in which lamella phases are uniformly combined can be efficiently and simply manufactured.
Hereinafter, the manufacturing method of the present invention in this form is referred to as a wet manufacturing method.

In the wet manufacturing method of the present invention, it is preferable to use a solvent selected from alcohols, hydrocarbons, aromatics, ketones, ethers, esters, volatile silicone oils, and isoparaffins as the volatile solvent.
By using the above-mentioned volatile solvent, a powder composition can be produced safely and efficiently.

  In the wet manufacturing method of the present invention, the volatile solvent is volatilized under reduced pressure. By carrying out like this, a volatile solvent can be volatilized efficiently.

  The present invention also relates to a method for producing an external preparation for skin, which comprises a step of mixing the powder composition produced by the production method of the present invention described above with other components.

Further, the present invention is a method for producing a powder composition comprising a powder base material having a lamella phase mainly composed of a surfactant on the surface, wherein the surfactant is mainly contained in the oil. The present invention also relates to a method for producing a powder composition, characterized in that a lamellar phase is combined with the surface of a powder substrate.
In such a production method, a volatile oil agent may be used as the oil agent. In this case, a powder composition containing no oil agent can be produced by volatilizing the oil agent.

  Since the powder base material is complexed with the lamellar phase, the powder composition of the present invention has the ability to retain moisture even in the oil agent, and can simultaneously retain water-soluble active ingredients. Moreover, if the powder composition of this invention is used, the skin external preparation excellent in moisture retention can be provided.

It is a schematic process drawing which shows the preparation method 2 of a lamella phase dispersion solution. The phase state in each step is also shown. It is a schematic process drawing which shows the preparation method 3 of a lamella phase dispersion solution. The phase state in each step is also shown. The measurement result by the small angle X ray scattering of the lamellar phase dispersion solution which mixed lecithin and water by 8: 2. The vertical axis represents the scattering intensity, and the horizontal axis represents the size of the scattering vector. The figure showing the small angle X-ray-scattering spectrum of the powder cosmetics of Example 3. FIG. The vertical axis represents the scattering intensity, and the horizontal axis represents the size of the scattering vector. It is the photograph which image | photographed the powder sample 1 with the transmission electron microscope. The measurement results of the occlusion property of the powder sample 1 and the comparative sample 1 are shown. The measurement result of the moisture retention of a lamellar phase coating foundation (LPF) and a squalane coating foundation (SQPF) is shown.

Hereinafter, embodiments for carrying out the present invention will be described in detail.
<1> Powder Composition The powder composition of the present invention includes an oil agent, a surfactant, and a powder base material, and a lamellar phase mainly composed of the surfactant is compounded on the surface of the powder base material. It is characterized by.
Hereinafter, each component which comprises this composition is demonstrated.

<1-1> Oil Agent The oil agent in the powder composition of the present invention can be mixed with a powder base material and a surfactant, and a lamellar phase mainly composed of a surfactant is formed in the continuous phase. There is no particular limitation as long as it can be used. When the powder composition of the present invention is applied to an external preparation for skin such as cosmetics, preferred examples of the oil include silicone oil, hydrocarbon oil, ester oil, natural animal and vegetable oil, and fluorine oil. By using these oil agents, the moisture retention of the powder composition can be enhanced.

Examples of silicone oil include organopolysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, dimethylsiloxane / methylphenylsiloxane copolymer, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc. Examples thereof include cyclic siloxane.
Among these, the cyclic siloxane described above is preferably used.

  Hydrocarbon oils include chain and cyclic hydrocarbons such as α-olefin oligomers, light isoparaffins, light liquid isoparaffins, squalane, liquid paraffin, liquid isoparaffins, hydrogenated isobutene, isooctane, decane, isododecane, isohexadecane, Polybutene etc. are mentioned.

  Ester oils include dioctyl succinate, diisobutyl adipate, dioctyl adipate, di (2-heptylundecyl) adipate, diisopropyl sebacate, dioctyl sebacate, dibutyl octyl sebacate, diisostearyl malate, triethyl citrate , Ethylene glycol dioctanoate, neopentyl glycol dioctanoate, propylene glycol dicaprate, neopentyl glycol dicaprate, trimethylolpropane trioctanoate, trimethylolpropane triisostearate, pentaerythritol tetraoleate, ethyl acetate, butyl acetate, amyl acetate Octyldodecyl neopentanoate, cetyl ethylhexanoate, cetyl octanoate, isononyl isononanoate, isotridecyl isononanoate Hexyldecyl dimethyl octoate, ethyl laurate, hexyl laurate, isopropyl myristate, myristyl myristate, isocetyl myristate, octyldodecyl myristate, isopropyl palmitate, octyl palmitate, cetyl palmitate, isocetyl palmitate, isomate palmitate Stearyl, butyl stearate, hexyldecyl stearate, isopropyl isostearate, isocetyl isostearate, decyl oleate, oleyl oleate, octyldodecyl oleate, ethyl linoleate, isopropyl linoleate, cetyl lactate, myristyl lactate, cholesteryl hydroxystearate , Dioctyldecyl lauroyl glutamate, lauroyl sarcosine isopropyl, methoxy cinnamon Ethylhexyl, and the like.

  Examples of natural animal and vegetable oils include avocado oil, almond oil, olive oil, wheat germ oil, safflower oil, jojoba oil, macadamia nut oil, cottonseed oil, and coconut oil.

  Examples of the fluorine oil include perfluoro oils.

  The powder composition of the present invention is prepared by adjusting a lamellar phase dispersion solution containing lecithin as a surfactant by the method described in the item <Preparation Method 1 of <3-1-1> Lamellar Phase Dispersion Solution> described later. In this case, it is preferable to use an oil agent that is liquid at 25 ° C. with a molecular weight of greater than 114 g / mol.

<1-2> Surfactant The surfactant in the present invention is not particularly limited as long as it is an amphiphilic substance, and any of an ionic surfactant and a nonionic surfactant can be used. Preferably, lecithin which is an amphoteric surfactant is used. Nonionic surfactants can also be preferably used. For example, silicone surfactants, polyoxyethylene alkyl ethers, sucrose fatty acid esters, sphingosines, fatty acids and the like can be preferably used.

Lecithin extracted from living bodies of plants, animals and microorganisms and purified as desired may be used, or synthesized. Preferably, plant-derived lecithin such as soybean, corn, peanut, rapeseed, and wheat, or animal-derived lecithin such as egg yolk can be used.
The lecithin in the present invention includes phosphatidylcholine, phosphatidic acid, phosphatidylglycerol, phosphatidylinositol, phosphatidylethanolamine, phosphatidylmethylethanolamine, phosphatidylserine, bisphosphatidic acid, diphosphatidylglycerol (cardiolipin) and the like.
In the present invention, “lecithin” also includes hydrogenated lecithin, enzymatically decomposed lecithin, enzymatically decomposed hydrogenated lecithin, lysolecithin and the like.

The number of carbon atoms of the fatty acid constituting the hydrophobic group portion of lecithin is not particularly limited. For example, those having 8 to 20 carbon atoms, preferably 16 to 18 carbon atoms can be mainly used. The fatty acid may be saturated or unsaturated. The fatty acid may be linear or branched.
In the present invention, lecithin can be used in the form of a single kind of the above-mentioned compound or in the form of a mixture of the above-mentioned plural kinds of phospholipids.
The composition of lecithin is preferably composed mainly of phosphatidylcholine, for example, 20% by mass or more, and preferably 50% by mass or more is phosphatidylcholine.
A commercially available lecithin can be used. For example, the following commercially available products can be used.
Resinol S-10, Nikko Chemicals (hydrogenation: ○, PC (phosphatidylcholine) content: 25-30%)
Resinol S-10E, Nikko Chemicals (hydrogenation: ○, PC content: 75-85%)
Resinol S-10EX, Nikko Chemicals (hydrogenation: ○, PC content:> 95%)
Basis LP-20, Nisshin Oilio Co., Ltd. (hydrogenated: x, PC content: 20-30%)
Basis LP-20H, Nisshin Oilio Co., Ltd. (hydrogenated: ○, PC content: unconfirmed)
Basis LS-60HR, Nisshin Oilio Co., Ltd. (hydrogenated: ○, PC content: 60-75%)
Basis LS-60, Nisshin Oillio Co., Ltd. (hydrogenated: x, PC content: unconfirmed)
Phospholipon 85G, H.P. Holstein GmbH & Co. Company KG ((hydrogenated: x, PC content:> 85%))
Phospholipon 90G, H.P. Holstein GmbH & Co. Company KG ((hydrogenated: x, PC content:> 94%))
Phospholipon 75IP, H.P. Holstein GmbH & Co. Company KG ((hydrogenated: x, PC content:> 70%))
Phospholipon 90IP, H.P. Holstein GmbH & Co. Company KG ((hydrogenated: x, PC content:> 90%))
Phospholipon 80H, H.P. Holstein GmbH & Co. Company KG ((hydrogenated: ○, PC content:> 70%))
Phospholipon 90H, H.P. Holstein GmbH & Co. KG ((hydrogenated: ○, PC content:> 90%))
Phospholipon 75HIP, H.P. Holstein GmbH & Co. Company KG ((hydrogenated: ○, PC content:> 70%))
Phospholipon 90 HIP, H.P. Holstein GmbH & Co. KG ((hydrogenated: ○, PC content:> 90%))
Lipoid E25, H.I. Holstein GmbH & Co. Company KG ((hydrogenated: x, PC content:> 25%))
Lipoid E80, H.I. Holstein GmbH & Co. Company KG ((hydrogenated: x, PC content:> 80%))
Lipoid E80S, H.I. Holstein GmbH & Co. KG ((hydrogenated: x, PC content:> 64%))
Lipoid EPCS, H.C. Holstein GmbH & Co. Company KG ((hydrogenated: x, PC content:> 96%))
Epikron 200, Cargill (hydrogenated: x, PC content:> 95%)
Epikron 200SH, Cargill (hydrogenated: ○, PC content: unconfirmed)
Epikron 100P, Cargill (hydrogenated: x, PC content: unconfirmed)
Epikron 100H, Cargill (hydrogenated: ○, PC content: unconfirmed)
PhosphoLipid PCSH70, Nippon Seika Co., Ltd. (hydrogenated: ○, PC content: about 70%)
Egg yolk lecithin PL-100E, Kewpie company (hydrogenated: ○, PC content: about 83%)

When lecithin is mainly used, it can be combined with other auxiliary surfactants (nonionic surfactants, ionic surfactants).
In this case, it is preferable that lecithin accounts for 60% by mass or more, more preferably 80% by mass or more of the surfactant forming the lamellar phase.

As described above, a silicone surfactant may be used as the surfactant in the present invention. The silicone surfactant is a surfactant having a polyorganosiloxane (silicone chain) in a hydrophobic group. The hydrophilic group is preferably selected from polyether or polyglycerin. Preferred examples of the polyether include polyoxyethylene, polyoxypropylene, and oxyethylene / oxypropylene copolymers.
The average degree of polymerization of polyoxyethylene or polyoxypropylene, oxyethylene / oxypropylene copolymer, and polyglycerin is, for example, about 8 to 15.
The polyorganosiloxane may be linear or branched. A plurality of polyorganosiloxane chains may be cross-linked. The silicone chain may be modified with an alkyl group.

  The HLB of the silicone surfactant is preferably 3 to 13, more preferably 6 to 10.

  The silicone surfactant is preferably soluble or dispersible in the oil. Moreover, it is preferable that it is a liquid at room temperature.

  In the present invention, the silicone surfactant can be used in the form of a single kind of the above compound or in the form of a mixture of plural kinds.

These silicone surfactants are known as cosmetic raw materials, and any of them can be used.
Commercially available silicone surfactants can be used. For example, the following commercially available products can be used.
・ SH3772M (PEG-12 dimethicone (polyoxyethylene type), HLB: 6, Toray Dow Corning)
・ SH3773M (PEG-12 dimethicone (polyoxyethylene type), HLB: 8, Toray Dow Corning)
・ FZ2222 (Polysilicone-13 (oxyethylene / oxypropylene type), HLB: 6, Toray Dow Corning)
・ KF6013 (PEG-9 dimethicone ((polyoxyethylene type)), HLB: 10, Shin-Etsu Silicone)
・ KF6100 (polyglyceryl 3 disiloxane dimethicone (polyglycerin), Shin-Etsu Silicone)

<1-3> Powder base material The powder base material in the present invention is not particularly limited as long as it is used as a powder for cosmetics, and is hydrophobic even if the powder surface is hydrophilic. May be sex. As the powder base material in the present invention, for example, mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, anhydrous silicic acid (silica), aluminum oxide, barium sulfate, etc. whose surface may be treated Powders; surface may be treated, bengara, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, bitumen, titanium oxide, zinc oxide inorganic pigments; surface may be treated, mica Pearls such as titanium, fish phosphorus foil, bismuth oxychloride; red 202, red 228, red 226, yellow 4, blue 404, yellow 5, red 505, which may be raked, Organic pigments such as red 230, red 223, orange 201, red 213, yellow 204, yellow 203, blue 1, blue 201, green 201, purple 201, red 204; Riechiren powder, can be used polymethyl methacrylate, nylon powder, organic powders such as organopolysiloxane elastomers.
It is also possible to use a mixed powder containing two or more of the above powders.

<1-4> Water The powder composition of the present invention may contain water. In this case, the content of water in the entire powder composition is preferably 10% by mass or less, more preferably 0.05 to 5% by mass, and still more preferably 0.1 to 1% by mass. The weight ratio of water to the surfactant in the powder composition is preferably 1: 1 to 1:20, more preferably 1: 2 to 1:10, and still more preferably 1: 3 to 1: 5. is there.

<1-5> Water-soluble active ingredient As mentioned above, when water is contained in the powder composition of the present invention, a water-soluble active ingredient can be contained at the same time. That is, the layer in which water in the lamellar phase is retained can be in a form containing a hydrophilic active ingredient.
By setting it as such a form, the effect which an active ingredient has can be heightened by making an active ingredient penetrate | invade into a stratum corneum efficiently.

Incorporation of the hydrophilic active ingredient into the layer in which water in the lamella phase is retained can be carried out by a method usually used in the cosmetics and pharmaceutical fields.
That is, the active ingredient is dissolved in water to prepare an aqueous solution of the active ingredient. By stirring and mixing the aqueous solution and the surfactant, a dispersion solution of a lamellar phase containing an active ingredient in a layer in which moisture is retained can be obtained.
And the powder composition which the lamellar phase which contains an active ingredient in the layer by which the water | moisture content was hold | maintained can be obtained by the dry manufacturing method or wet manufacturing method mentioned later using this dispersion solution.

The water-soluble active ingredient to be contained in the layer in which the water in the lamella phase is retained is not particularly limited as long as it is used for an external preparation for skin. For example, tranexamic acid, glycyrrhizic acid and its salt, ascorbine Ascorbic acids such as acid, ascorbic acid phosphate ester, 3-O-ethylascorbic acid, ascorbic acid glucoside or salts thereof, ursolates such as arbutin and potassium ursolate phosphate, pyridoxine, riboflavin or salts thereof Preferred examples include vitamin B, hyaluronic acid and salts thereof, fucoidan, sulfated trehalose or salts thereof, trehalose, amino acids and amino acid derivatives, esculetin glycosides, liquid or solid plant extracts, and the like.
In particular, dipotassium glycyrrhizinate, ascorbic acid 2-glucoside, and tranexamic acid can be remarkably improved in penetration efficiency into the stratum corneum by being contained in a layer in which water in the lamellar phase is retained.

<2> External preparation for skin The present invention also relates to an external preparation for skin containing the powder composition. The external preparation for skin of the present invention may contain any commonly used optional component as long as the effects of the present invention are not impaired. Examples of such optional ingredients include 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, and hardened coconut oil. Oil, wax, oils such as beeswax, molasses, 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 Oil agents such as synthetic ester oils such as trimethylolpropane isostearate and pentane erythritol tetra-2-ethylhexanoate; fatty acid soap (sodium laurate) Anionic surfactants such as potassium lauryl sulfate, alkyl sulfate triethanolamine ether; cationic surfactants such as stearyltrimethylammonium chloride, benzalkonium chloride, laurylamine oxide; imidazoline-based amphoteric Amphoterics such as surfactants (2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine surfactants (alkyl betaine, amide betaine, sulfobetaine, etc.), acylmethyl taurine, etc. Surfactants: sorbitan fatty acid esters (such as sorbitan monostearate and sorbitan sesquioleate), glycerin fatty acids (such as glyceryl monostearate), propylene glycol fatty acid esters (monostearic acid) Propylene glycol, etc.), hardened castor oil derivative, glycerin alkyl ether, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbite fatty acid esters (POE-sorbite monolaurate, etc.) , POE glycerin fatty acid esters (POE-glycerin monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE2-octyldodecyl ether, etc.), POE alkyl phenyl ethers (POE nonylphenyl ether, etc.), Pluronic types, POE / POP alkyl ethers (POE / POP2-decyltetradecyl ether, etc.), Tetro Nonionic surfactants such as sucrose, POE castor oil / hardened castor oil derivatives (POE castor oil, POE hardened castor oil, etc.), sucrose fatty acid ester, alkyl glucoside; polyethylene glycol, glycerin, erythritol, sorbitol, xylitol , Polyhydric alcohols such as maltitol, propylene glycol, and 2,4-hexanediol; moisturizing components such as sodium pyrrolidonecarboxylate, lactic acid, and sodium lactate; paraaminobenzoic acid ultraviolet absorbers; anthranilic acid ultraviolet absorbers; Salicylic acid ultraviolet absorbers; cinnamic acid ultraviolet absorbers; benzophenone ultraviolet absorbers; sugar ultraviolet absorbers; 2- (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 4-methoxy-4 ′ UV light such as t-butyldibenzoylmethane Adsorbents such; ethanol, lower alcohols antibacterial agents such phenoxyethanol such isopropanol can be preferably exemplified.

  Moreover, in the skin external preparation of this invention, the powder in which the lamellar phase has not adhered to the surface can be contained in the limit which does not impair the effect of this invention. Such a powder base material may have a surface-treated powder such as mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, anhydrous silicic acid (silica), aluminum oxide, barium sulfate, etc. The surface may be treated, inorganic pigments such as bengara, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, bitumen, titanium oxide, zinc oxide; the surface may be treated, mica titanium, Pearl agents such as fish phosphorus foil, bismuth oxychloride; red 202, red 228, red 226, yellow 4, blue 404, yellow 5, red 505, red 230 which may be raked No., 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, etc .; , Polymethyl methacrylate, nylon powder, organic powders such as organopolysiloxane elastomers and the like can be preferably exemplified.

<3> Manufacturing Method The manufacturing method of the powder composition of the present invention is characterized in that a lamellar phase mainly containing a surfactant is compounded on the surface of a powder base material in an oil agent. And in the preferable form of this invention, the process of mixing an oil agent, surfactant, and a powder base material is included.
Hereinafter, embodiments of a dry manufacturing method and a wet manufacturing method according to the method for manufacturing a powder composition of the present invention will be described in detail.

<3-1> Dry manufacturing method The dry manufacturing method of the powder composition of the present invention comprises mixing an oil agent and a surfactant to obtain a lamellar phase dispersion solution, and mixing the lamellar phase dispersion solution and the powder base material. Including the step of:
As the oil agent and the surfactant in this production method, those described in the items <1-1> to <1-2> can be used. In addition, as the powder base material in this production method, the powder described in the above item <1-3> can be used, and a composite powder containing two or more kinds of such powders may be used. When it is desired to obtain a powder composition containing two or more powder base materials in which lamella phases are combined, it is preferable to use a mixed powder.

Hereinafter, the method for adjusting the lamellar phase dispersion solution is described in <3-1-1> (1) to (3), and the step of mixing the lamellar phase dispersion solution and the powder base material is described in <3-1-2>. .
<3-1-1> Preparation method of lamellar phase dispersion solution (1) Preparation method 1 of lamellar phase dispersion solution
The step of mixing an oil agent and a surfactant to obtain a lamellar phase dispersion solution is performed by preparing a mixture by mixing the above-described surfactant, oil agent, and water as required, and then shaking or stirring the mixture. It can be carried out.
Shaking can be performed using a shaker or the like. Stirring can be performed using an ultrasonic disperser or the like.

(2) Preparation method 2 of lamellar phase dispersion solution
Further, the step of obtaining a lamellar phase dispersion solution comprises dissolving a surfactant in a volatile solvent to obtain a first isotropic solution, mixing the first isotropic solution with an oil agent, 2 is a step of obtaining an isotropic solution, a step of volatilizing the volatile solvent in the second isotropic solution, and volatilization of the volatile solvent.
As the volatile solvent in this case, those described in detail in the following <Wet production method> can be used.
Hereinafter, the preparation method 2 of the lamellar phase dispersion solution will be described with reference to FIG.

  The content of the surfactant in the first isotropic solution may be in a range where the surfactant is sufficiently dissolved. For example, the content of the surfactant can be 10 to 90% by mass. This is because when the amount is less than 10% by mass, the volatilization time of the volatile solvent may become long, and when it exceeds 90% by mass, the solution becomes viscous and may be difficult to dissolve.

Further, the first isotropic solution may contain water.
Since the preparation of a lamellar phase dispersion solution by volatilization of a volatile solvent is intended to form a lamellar phase regardless of conventional physical stirring, the presence of water is necessary for the purpose of assisting dispersion by physical stirring. Rather, it can be said that it is useful in a system with little water.
However, in the preparation of a lamellar phase dispersion solution by volatilization of the volatile solvent, the presence of water may assist the formation of the lamellar phase.
From these viewpoints, the present invention may contain water having a mass of 1 or less that of the surfactant. In this case, the surfactant can be mixed with water and mixed with a volatile solvent (FIG. 1 (a)). Of course, you may mix surfactant, water, and a volatile solvent.

In the preparation of a lamellar phase dispersion solution by volatilization of the volatile solvent, the surfactant 1 is dissolved in the volatile solvent 2 to prepare a first isotropic solution 3. This preparation can be performed by ordinary mixing and stirring.
The first isotropic solution 3 obtained by dissolving the surfactant 1 in the volatile solvent 2 is a state in which the surfactant 1 is monodispersed in the volatile solvent 2 or the interface in the volatile solvent 2. A complex such as reverse micelle of the active agent 1 is formed (FIG. 1B).
Such an isotropic solution has a high fluidity and is easy to mix with a subsequent oil agent.

  In the step of obtaining the second isotropic solution, the mixing ratio of the first isotropic solution and the oil agent is such that the surfactant content in the produced lamellar phase dispersion solution is 0.1. It can be set as the range used as -10 mass%.

By mixing the first isotropic solution 3 and the oil agent 4, an isotropic solution (second isotropic solution) 5 in which the surfactant 1 is dispersed in the oil agent 4 can be obtained.
Here, the form of dispersion of the surfactant into the oil varies depending on the solubility of the volatile solvent used in the oil.
(I) When the volatile solvent 2 is soluble in the oil agent 4, the first isotropic solution 3 is compatible with the oil agent to form a one-phase solution. That is, the surfactant 1 contained in the first isotropic solution 3 is present in a monodispersed state or in a state where a complex such as reverse micelle is formed in the one-phase solutions 2 and 4. (FIG. 1 (c)).
(Ii) On the other hand, when the volatile solvent 2 is insoluble or hardly soluble in the oil agent 4, the first isotropic solution 3 is not compatible with the oil agent 4 and forms a two-phase solution. That is, the particles 31 of the first isotropic solution 3 are dispersed in the continuous phase of the oil agent 4 (FIG. 1D). As shown in FIG. 1 (d 2), the particles 31 are in a state where the surfactant 1 is monodispersed in the volatile solvent 2, or a complex such as reverse micelle of the surfactant 1 in the volatile solvent 2. It is in a formed state.
This state can be easily formed by a normal shaking or stirring operation in the mixing step.
In addition, when using a combination of a component that is sparingly soluble in an oil agent and a component that is soluble in an oil agent as a surfactant, the component that is sparingly soluble in the oil agent is dissolved in a volatile solvent. It is also possible to dissolve in an oil and mix them.

In the step of volatilizing the volatile solvent, the volatile solvent can be volatilized by a conventional method. That is, it can be performed by vaporizing the volatile solvent by reducing the pressure. Moreover, it is possible to carry out by heating a liquid mixture to the temperature which a volatile solvent vaporizes. Volatilization is preferably performed under reduced pressure. Moreover, when heating, it heats below the temperature which can maintain a lamellar phase, ie, below the temperature which does not phase-transform.
When the above-mentioned second isotropic solution forms two phases, the first isotropic solution is sufficiently dispersed in the oil by shaking or stirring, and then this step is entered. Is preferred.
It is also preferable to apply a stirring force during volatilization from the viewpoint of forming a fine lamellar phase.

  As described above, by volatilizing the volatile solvent 2, the second isotropic solution 5 is phase-shifted to obtain a lamellar phase dispersion solution 8 in which the lamellar phase 7 is dispersed in the oil agent 4 (FIG. 1). (E)). The state of the lamella phase formed may be either a single layer or multiple layers. Confirmation that the lamella phase is formed can be confirmed by performing microscopic observation under polarized light, for example.

(3) Preparation method 3 of lamellar phase dispersion solution
Apart from the above-described method, the step of obtaining a lamellar phase dispersion solution can also be performed as follows. That is, a surfactant and an oil agent are mixed, heated to obtain an isotropic solution, a step of cooling the isotropic solution, and a lamellar phase mainly composed of the surfactant is formed by the cooling. A lamellar phase dispersion solution can be obtained by the process of making it.
Hereinafter, the preparation method 3 of the lamellar phase dispersion solution will be described with reference to FIG.

  In the step of mixing the surfactant and the oil agent and heating to obtain the isotropic solution, the mixing ratio of the surfactant and the oil agent is such that the content of the surfactant in the produced lamellar phase dispersion solution is as follows. The range may be 0.1 to 10% by mass.

Heating may be performed until the surfactant lamellar (FIG. 2A) undergoes phase transition and the mixture becomes an isotropic solution. Whether or not it is an isotropic solution can be determined by observing the solution through a polarizing plate.
Further, the isotropic solution obtained by heating may be one-phase or two-phase, but it is more preferable to heat it until it becomes one-phase (see FIG. 2B, L1). In addition, when the said oil agent contains 2 or more types of oil agents, it is preferable that the said surfactant is performed to the temperature which forms a one-phase isotropic solution with at least 1 type of the said oil agent.
Whether the isotropic solution is one-phase or two-phase can be distinguished by observing the presence or absence of separation by leaving it at a constant temperature, or by measuring the light transmittance of the solution.
The phase transition temperature of the mixture varies depending on the combination of surfactant and oil used. Therefore, the heating temperature may be adjusted in consideration of the phase transition temperature according to these combinations.
For example, when lecithin is used as a surfactant and squalane is used as an oil agent, a phase transition from a lamellar phase to a two-phase isotropic solution is observed at around 65 ° C., and a two-phase is obtained at around 90 ° C. A phase transition from an isotropic solution to a one-phase isotropic solution is seen. Accordingly, the heating temperature in this case is preferably 65 ° C. or higher, more preferably 90 ° C. or higher.
The isotropic solution 3 obtained by heating the mixture of the surfactant 1 and the oil agent 2 is in a state in which reverse micelles of the bilayer membrane component 1 are formed in the oil agent 2 (FIG. 2B).
In this embodiment, the heating is performed until a one-phase isotropic solution is obtained. However, the heating is performed until the two-phase isotropic solution (L1 + L2) as shown in FIG. 2C is obtained. Form may be sufficient. In the combination of lecithin and squalane, the highly viscous isotropic solution (L2) containing the reverse-like micelles of the surfactant 1 in the oil agent 2 is phase-separated from the oil agent (L1).
When a two-phase isotropic solution is formed, it is important to stir before cooling and / or during cooling to obtain a dispersed state.

In addition, the mixture of the surfactant and the oil may further contain water.
The process of heating and cooling the mixture of surfactant and oil to obtain a lamellar phase dispersion solution is intended to form a lamellar phase without using conventional physical agitation. For the purpose of helping, the presence of water is not necessary, but rather it is useful in systems with little water.
However, in the formation of the lamellar phase by cooling described later, the presence of water may assist the formation of the lamellar phase.
From these viewpoints, the present invention may contain water having a mass of 1 or less that of the surfactant.
The smaller the water content, the lower the transition temperature to the isotropic solution. Therefore, when the production efficiency in the present invention is taken into consideration, it is advantageous that the water content is small.

In the step of cooling the isotropic solution, the cooling method is not particularly limited, and examples thereof include a method of placing the isotropic solution at a temperature below room temperature and a method of cooling with a refrigerant. Moreover, it can cool by mixing the dilution solvent of temperature lower than the isotropic solution mixed. For example, you may mix the cooled oil agent as a dilution solvent.
The cooling temperature may be equal to or lower than the temperature at which the isotropic solution undergoes phase transition and the coexisting phase of the lamellar phase and the oil agent is formed. As a guide, cooling to about room temperature can be mentioned.
Moreover, it is also preferable to give a stirring force during cooling from the viewpoint of forming a fine lamellar phase.
Moreover, since it becomes possible to form a fine lamella phase, so that the rate of cooling becomes large (it quenches rapidly), such a form is also preferable.

<3-1-2> Step of mixing the lamellar phase dispersion solution and the powder base material In the step of mixing the lamellar phase dispersion solution obtained as described above and the powder base material, It can be carried out by a usual method of mixing oil. That is, it can be performed by pulverizing the powder base material with a pulverizer, adding a lamellar phase dispersion solution, and mixing with a Henschel mixer.
At this time, the mixing ratio of the lamellar phase dispersion solution and the powder base material is preferably 1:99 to 30:70, more preferably 2:98 to 20:80, and further preferably 3:97 to 15:85. .

<3-1-3> Method for producing powder composition not containing oil agent After the step of mixing the lamellar phase dispersion solution and the powder base material, the step of volatilizing the oil agent in the powder composition is taken. Thus, a powder composition containing no oil agent can be produced. In this case, a volatile oil agent is used as the oil agent. Examples of the volatile oil include light isoparaffin, dimethicone and cyclomethicone having a boiling point of 150 to 250 ° C. In the case of dimethicone, the viscosity is 1 mPa · s or less in terms of viscosity. Some of these volatile oils are already commercially available as cosmetic raw materials, and such cosmetic raw materials can be purchased and used. Among such commercially available products, preferable examples include “IP Solvent 1620MU” manufactured by Idemitsu Kosan Co., Ltd. and “Silicone KF96-1” manufactured by Shin-Etsu Silicone.
Preferably, the step of volatilizing the volatile oil from the mixture of the lamella phase dispersion solution and the powder base material is preferably performed at 50 to 100 ° C. for 6 to 48 hours.

  Confirmation that a lamellar phase is formed in the composition produced by the above method can be confirmed, for example, by performing microscopic observation under polarized light.

<3-2> Wet manufacturing method The wet manufacturing method of the powder composition of the present invention comprises mixing an oil agent, a surfactant, a volatile solvent, and a powder base material to obtain an intermediate powder composition, And volatilizing the volatile solvent in the intermediate powder composition.
As the oil agent and the surfactant in this production method, those described in the above <1-1> to <1-2> can be used. In addition, as the powder base material in this production method, the powder described in the above item <1-3> can be used, and a composite powder containing two or more kinds of such powders may be used. When it is desired to obtain a powder composition containing two or more powder base materials in which lamella phases are combined, it is preferable to use a mixed powder.

In the step of mixing the oil agent, the surfactant, the volatile solvent, and the powder base material to obtain the intermediate powder composition, the oil agent and the powder base material are mixed in advance, and the volatile solvent and the surfactant are mixed therewith. If desired, a mixed solution of water can be added and mixed by stirring.
Moreover, you may make it add the solution which mixed the oil agent, the volatile solvent, surfactant, and water as needed to a powder base material.
The content of the surfactant in the intermediate powder composition is preferably 0.05 to 10% by mass, more preferably 0.1 to 5% by mass, and still more preferably 0.2 to 2% by mass. Similarly, the content of the oil agent in the intermediate powder composition is preferably 0.1 to 20% by mass, more preferably 0.5 to 15%, and further preferably 1 to 10% by mass. Similarly, the content of the volatile solvent in the intermediate powder composition is preferably 10 to 70% by mass, more preferably 20 to 60% by mass, and still more preferably 30 to 50% by mass. And content of the powder base material in an intermediate | middle powder composition becomes like this. Preferably it is 20-90 mass%, More preferably, it is 30-80 mass%, More preferably, it is 40-70 mass%.

Examples of the volatile solvent include alcohols such as methanol, ethanol, propanol and isopropanol, hydrocarbons such as pentane, hexane and cyclopentane, aromatics such as benzene, ketones such as acetone, ethers and esters. And volatile silicone oils such as decamethylpentasiloxane, fluorocarbons, isoparaffins and the like.
Of these, ethanol, propanol, acetone and the like are preferably used.

  In the wet manufacturing method, the volatile solvent can be volatilized by a conventional method. That is, it can be carried out by vaporizing a volatile solvent under reduced pressure. It can also be carried out by heating the intermediate powder composition to a temperature at which the volatile solvent vaporizes. Volatilization is preferably performed under reduced pressure. Moreover, when heating, it heats below the temperature which can maintain a lamellar phase, ie, below the temperature which does not phase-transform.

  If a volatile oil agent is used as the oil agent, a powder composition containing no oil agent can be produced by volatilizing the volatile oil agent at the same time by the volatilization step of the volatile solvent. As the volatile oil agent, those described in the above <3-1-3> can be used.

<4> Manufacturing method of skin external preparation The powder composition manufactured by the manufacturing method of this invention can be used as a raw material of a skin external preparation. Of course, the powder composition manufactured by such a method can also be used as a skin external preparation as it is.
In this case, examples of the external preparation for skin include powder cosmetics such as foundation, teak, eye shadow, loose powder and pressed powder.

<1> Dry production method A powder cosmetic containing the powder composition of the present invention was produced by a dry production method.
Example 1
A powder foundation was produced according to the following formulation.

(A) Silicone-treated pigment dye (titanium oxide, iron oxide) 15
(A) Silicone-treated talc 37.7
(A) Methyl methacrylate cross polymer 15
(A) Fluorine-treated mica 10
(A) Fluorine-treated sericite 10
(A) Methylparaben 0.3
(B) Lamellar phase dispersion solution 12
(C) Silicone surfactant 1.6
(C) Water 0.4
(D) Cetyl ethylhexanoate 2
(D) Dimethicone 8
(Unit: mass%)

The (C) and (D) groups were mixed and dissolved by heating at 80 ° C., and then the solution was cooled to prepare a lamellar phase dispersion solution (B) in advance. After mixing the components of (A) group and coarsely pulverizing with a pulverizer, (B) was added and mixed with a Henschel mixer. Thereafter, it was pulverized again with a pulverizer and cast into a metal pan to produce a powder foundation.

(Example 2)
Loose powder was produced according to the following formulation.

(A) Silicone acid-treated pigment dye (titanium oxide, iron oxide) 1
(A) Amino acid-treated talc 60.7
(A) Methyl methacrylate cross polymer 10
(A) Mica 10
(A) Silicone resin powder 10
(A) Methylparaben 0.3
(B) Lamella phase dispersion solution 4
(C) Lecithin (Epikuron 200) 0.6
(C) 10% aqueous potassium hydroxide solution 0.3
(C) Ascorbic acid glucoside 0.1
(D) Ethyl hexanoate cetyl 3
(Unit: mass%)

The (C) and (D) groups were mixed to obtain a lamellar phase dispersion solution (B) by ultrasonic dispersion. After mixing the components of (A) group and coarsely pulverizing with a pulverizer, (B) was added and mixed with a Henschel mixer. After that, the powder was pulverized again to produce loose powder.

<2> Wet manufacturing method The powder cosmetics containing the powder composition of this invention were manufactured with the wet manufacturing method.
(Example 3)
A powder foundation was produced according to the following formulation.

(A) Powder foundation matrix 95
(B) Silicone-treated pigment dye (titanium oxide, iron oxide) 15
(B) Silicone-treated talc 47.7
(B) Methyl methacrylate cross polymer 10
(B) Talc / Titanium oxide / Alumina / Silica mixed powder 5
(B) Mica titanium 10
(B) Methylparaben 0.3
(C) Cetyl ethylhexanoate 7
(D) Intermediate solution 65
(E) Lecithin (Epikuron 200) 3
(E) Water 2
(F) Ethanol 60
(Unit: mass%)

A solution (D) in which the groups (E) and (F) were mixed and dissolved by stirring at room temperature was prepared in advance. (B) The components of the group were mixed and coarsely pulverized with a pulverizer, and then (C) was added and mixed with a Henschel mixer. Thereafter, the mixture was again pulverized with a pulverizer to obtain (A). (A) and (D) were mixed thoroughly, and a sample obtained by volatilizing ethanol at 40 ° C. was molded into a metal pan to produce a powder foundation.

<3> Observation of Lamellar Phase Regarding the powder cosmetics of Examples 1 to 3 above, it was observed whether or not the surface of the powder base material was coated with the lamellar phase. For the evaluation of the state of the lamella phase, a polarizing microscope that can observe the anisotropy of the lamella phase and small-angle X-ray scattering that can determine the regular structure of the lamella structure were used. When small-angle X-ray scattering was performed, a lamellar phase dispersion solution in which lecithin (Epikuron 200) and water were mixed at 8: 2 was also observed as a control experiment.
As a result of observation with a polarizing microscope, it was confirmed that the powder base material in the powder cosmetics of Examples 1 to 3 was coated with a lamellar phase.
As a result of small-angle X-ray scattering, a scattering spectrum peculiar to the lamellar phase having a peak ratio of 1: 2 was observed in any of the powder cosmetics of Examples 1 to 3. FIG. 3 shows a lamellar phase dispersion solution, and FIG. 4 shows a small-angle X-ray scattering spectrum of the powder cosmetic of Example 3.

<4> Test Example (1) Examination of Occlusion A powder sample 1 which is a powder composition of the present invention was prepared by the following method.
An intermediate solution was prepared by mixing 3 parts by mass of lecithin (Epicuron 200), 2 parts by mass of water, and 60 parts by mass of ethanol and stirring and dissolving at room temperature.
88 parts by mass of talc was pulverized with a pulverizer, 7 parts by mass of cetyl ethylhexanoate was added thereto, and mixed with a Henschel mixer. Thereafter, the mixture was again pulverized to prepare a mixed powder.
A powder sample 1 was prepared by thoroughly mixing 65 parts by mass of the intermediate solution and 95 parts by mass of the mixed powder and volatilizing ethanol at 40 ° C.
FIG. 5 shows a photograph of the powder sample 1 taken with a transmission electron microscope. As shown in FIG. 5, in the powder sample 1, the lamellar phase is compounded on the surface of talc.
In addition, talc which was not subjected to any treatment after being pulverized by a pulverizer was prepared as a comparative sample 1.

The plugability of the powder sample 1 was evaluated by the cup method as follows.
Water was put into the cup, and filter paper moistened with a sebum component (oleic acid) was placed so as to close the opening. Comparative sample 1 or powder sample 1 in the same amount as the sebum component contained in the filter paper was further applied to the filter paper. Then, the cup was left at 35 ° C., and the water evaporation rate was calculated.
As a result, the water evaporation rate when the comparative sample 1 was applied was 8.6 mg / cm ² / h. On the other hand, the moisture evaporation rate when the powder sample 1 was applied was 4.6 mg / cm ² / h (FIG. 6).
This result has shown that the powder sample 1 is excellent in the obstruction | occlusion property of a water | moisture content.
From the above, it was found that the powder composition of the present invention can prevent moisture transpiration from the skin and is excellent in moisture retention.

(2) Examination of moisturizing properties According to the formulation of Table 1, lamellar phase coating foundation (LPF) which is an external preparation for skin of the present invention and squalane coating foundation (SQPF) which is an external preparation for comparison are described in Example 3. It was prepared by the method according to

The moisturizing properties of LPF and SQPF were evaluated as follows.
The water content of the facial skin of 20 subjects was measured with SKICON EX-200. Next, 20% glycerin aqueous solution was applied to the entire face, and LPF and SQPF were applied to each half face. Four hours after application, the entire face was washed with cleansing and face wash, and the moisture content was measured.
As a result, when the moisture content of the skin before application of LPF and SQPF was 1, the moisture content of the skin after application was 1.21 and 1.04, respectively (FIG. 7).
This result has shown that the skin external preparation of this invention is excellent in the moisture retention of skin.

(3) Difficulty in feeling of dryness For LPF and SQPF, the difficulty of feeling of dryness was evaluated by the following method.
A questionnaire was conducted in which 20 subjects used LPF and SQPF respectively, and selected a foundation that did not feel dry. As a result, 14 subjects replied LPF, 5 subjects replied SQPF, and 1 subject replied.
This result indicates that the external preparation for skin of the present invention hardly feels dry when used.

(4) Evaluation of penetration amount of water-soluble active ingredient into stratum corneum Powder sample 2 and comparative sample 2 were prepared by the following method.
3 parts by mass of lecithin (Epicuron 200), 0.5 parts by mass of dipotassium glycyrrhizinate, 1.5 parts by mass of pure water, and 60 parts by mass of ethanol were mixed to prepare an intermediate solution that was stirred and dissolved at room temperature.
88 parts by mass of talc was pulverized with a pulverizer, 7 parts by mass of cetyl ethylhexanoate was added thereto, and mixed with a Henschel mixer. Thereafter, the mixture was again pulverized to prepare a mixed powder.
A powder sample 2 was prepared by sufficiently mixing 65 parts by mass of the intermediate solution and 95 parts by mass of the mixed powder and volatilizing ethanol at 40 ° C.
Moreover, comparative sample 2 was prepared by mixing 0.5 parts by mass of dipotassium glycyrrhizinate and 99.5 parts by mass of comparative sample 1.

The powder sample 2 and the comparative sample 2 were each applied at 5 mg / cm ² to the forearms of 12 subjects and fixed with a film. After 6 hours, the powder sample 2 and the comparative sample 2 were wiped off, the stratum corneum was collected by tape stripping, and dipotassium glycyrrhizinate was quantitatively analyzed by HPLC.
As a result, penetration of the stratum corneum of dipotassium glycyrrhizinate when the powder sample 2 and comparative sample 2 was applied, respectively, 0.28 .mu.g ^/ cm 2, was 0.19μg / cm ^2.
This result shows that according to the powder composition of the present invention, the penetration efficiency of the water-soluble active ingredient into the stratum corneum can be increased.

  The present invention can be applied to powder cosmetics having excellent moisture retention.

Claims (14)

A powder composition comprising an oil agent, a surfactant, and a powder base material, wherein a lamellar phase mainly comprising the surfactant is complexed on a surface of the powder base material. The powder composition according to claim 1, wherein the oil agent is selected from silicone oil, hydrocarbon oil, ester oil, natural animal and vegetable oil, and fluorine oil. Furthermore, the powder composition of Claim 1 or 2 containing water. Furthermore, the powder composition of Claim 3 containing a water-soluble active ingredient. The powder composition according to any one of claims 1 to 4, wherein the surfactant includes lecithin and / or a nonionic surfactant. The skin external preparation containing the powder composition in any one of Claims 1-5. The method for producing a powder composition according to any one of claims 1 to 6, wherein a lamellar phase mainly comprising a surfactant is compounded on the surface of the powder base material in an oil agent. The manufacturing method of the powder composition of Claim 7 including the process of mixing an oil agent, surfactant, and a powder base material. A step of mixing an oil agent and a surfactant to obtain a lamellar phase dispersion solution;
The method for producing a powder composition according to claim 7 or 8, comprising a step of mixing the lamellar phase dispersion solution and a powder base material. Mixing an oil agent, a surfactant, a volatile solvent, and a powder base material to obtain an intermediate powder composition;
Volatilizing the volatile solvent in the intermediate powder composition;
The method for producing a powder composition according to claim 7 or 8, characterized by comprising:   The method for producing a powder composition according to claim 10, wherein the volatile solvent is selected from alcohols, hydrocarbons, aromatics, ketones, ethers, esters, volatile silicone oil, and isoparaffin.   The method for producing a powder composition according to claim 10 or 11, wherein the volatile solvent is volatilized under reduced pressure.   A method for producing an external preparation for skin, comprising a step of mixing the powder composition produced by the method for producing a powder composition according to any one of claims 7 to 12 with other components. A method for producing a powder composition comprising a powder base material in which a lamellar phase mainly comprising a surfactant is complexed on the surface,
A method for producing a powder composition, comprising laminating a lamellar phase mainly comprising a surfactant on the surface of a powder base material in an oil agent.