JP2015003888A - External preparation for skin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external preparation for skin excellent in a percutaneous absorption of a whitening component, while being excellent in a skin care effect.SOLUTION: An external preparation for skin is prepared by containing one or more kinds of alkyl-resorcinols, and via a liquid crystal phase. Preferably, the liquid crystal phase contains the following components (A)-(C) as constituents: (A) polyhydric alcohol; (B) phosphatide; (C) polyglycerol fatty acid ester; and furthermore, one or more kinds selected from the group consisting of a fatty acid monoester of polyglycerin and a fatty acid diester of polyglycerin are preferable as the component (C).

Description

  The present invention relates to an external preparation for skin which is excellent in skin care effect and excellent in transdermal absorbability of a whitening component.

  Conventionally, skin care cosmetics such as emulsions and creams have excellent skin care effects such as moisturizing the skin, protecting the skin from drying, and preventing rough skin, as well as anti-aging effects, whitening effects, etc. It is also required to have an excellent anti-aging effect. In order to meet these requirements, it is important to efficiently permeate active ingredients such as anti-aging components and whitening components into the skin. Therefore, conventionally, various measures on the dosage form have been made in order to penetrate the stratum corneum and efficiently reach the active ingredient inside the skin.

  As one of the specific techniques, the emulsification is performed through the active agent phase, so-called D phase, so that the particle size of the emulsified oil droplets is made fine and the active ingredients present in the oil droplets can easily reach the inside of the skin. Attempts have been made. (For example, refer to Patent Document 1 or Patent Document 2) However, although these techniques are excellent in basic skin care effects such as moisturizing, the effect of efficiently penetrating active ingredients into the skin is still insufficient. Met.

  Further, as a technique excellent in the effect of efficiently reaching the active ingredient into the skin, there is a vesicle that is a small sphere having a double membrane structure such as phospholipid having high affinity with the skin. (For example, refer to Patent Document 3 or Patent Document 4) However, in this technique, although the effect of efficiently reaching the active ingredient is excellent, there is a problem that basic skin care effects such as a moisturizing effect are reduced. was there.

  On the other hand, alkylresorcinol is known as an active ingredient having a high whitening effect. In an actual external preparation for skin, in order to effectively demonstrate the effect of this compound and obtain an effective whitening cosmetic, basic skin care effects such as moisturizing and efficient delivery of alkylresorcinol into the skin It has been required to develop a skin external preparation that can be used, but the combination with the above-described technology has not yet achieved the purpose.

JP 09-255529 JP 2012-92082 A JP-A-11-130651 Republished patent publication WO2008 / 149601

It is an object of the present invention to provide an external preparation for skin which is excellent in skin care effect and excellent in transdermal absorbability of a whitening component.

In view of the above-described problems of the prior art, the inventors have intensively studied for an external preparation for skin which is excellent in skin care effect and excellent in transdermal absorbability of a whitening component, and as a result, contain one or more of alkylresorcinol. And it discovered that the skin external preparation emulsified through the liquid crystal state solved a subject, and came to this invention. That is, the present invention is as follows.
(1) A skin external preparation characterized by containing one or more alkylresorcinols and being prepared via a liquid crystal phase.
(2) The external preparation for skin according to (1), wherein the liquid crystal phase comprises the following components (A) to (C) as constituent components.
(A) Polyhydric alcohol (B) Phospholipid (C) Polyglycerol fatty acid ester (3) One or more selected from the group consisting of polyglycerol fatty acid monoester and polyglycerol fatty acid diester The skin external preparation according to (1) or (2), which is characterized in that it exists.
(4) After adding water to the polyhydric alcohol phase containing phospholipid and polyglycerin fatty acid to form a liquid crystal phase, the oil phase containing one or more of alkylresorcinol in the liquid crystal layer phase Then, the external preparation for skin according to any one of (1) to (3), which is prepared by successively adding an aqueous phase and emulsifying.
(5) After adding water to the polyhydric alcohol phase containing a phospholipid and a polyglycerin fatty acid to form a liquid crystal phase, the oil phase containing one or more of alkylresorcinol in the liquid crystal layer phase Then, a method for producing an external preparation for skin, which is prepared by sequentially adding an aqueous phase and emulsifying.
(6) The method for producing an external preparation for skin according to (5), wherein the polyglycerol ester is one or more selected from the group consisting of a fatty acid monoester of polyglycerol and a fatty acid diester of polyglycerol.

ADVANTAGE OF THE INVENTION According to this invention, while being excellent in the kincare effect, the skin external preparation excellent in the transdermal absorbability of a whitening component can be provided.

Hereinafter, the present invention will be described in detail.
<1> Alkylresorcinol which is an essential component of the skin external preparation of the present invention The skin external preparation of the present invention contains one or more of alkylresorcinol as an essential component. The alkylresorcinol of the present invention is preferably 4-alkylresorcinol in which the 4th position of resorcinol is substituted with an alkyl group. Moreover, as a substituted alkyl group, a C3-C9 linear, branched and cyclic alkyl group is preferable. Preferred alkylresorcinols include 4-nbutylresorcinol, 4-namylresorcinol, 4-nhexylresorcinol, 4-cyclohexylresorcinol, 4-methylresorcinol, 4-ethylresorcinol, 4-propylresorcinol, 4- (1- Methylethyl) resorcinol, 4-n-butylresorcinol, 4- (2-methylpropyl) resorcinol, 4- (1-methylethylresorcinol), 1-ethylpropylresorcinol, 1-ethyl-2-methylpropylresorcinol, 1- Isopropyl-2-methylpropyl resorcinol, 1-butylpentyl resorcinol, 1-isobutyl-3-methylbutyl resorcinol, 4- (1-methylpropyl) resorcinol, 4- (1-methyl Butyl) resorcinol, 4-tert-butyl resorcinol and the like. Among these, 4-n-butylresorcinol is preferable. It is a known substance and can be produced according to a conventional method. For example, Lille, J .; Bitter, LA; Peiner, V. Trudy-Nauchono-Issledovatel 'skii Institut Slantsev (1969), No. 18, 127-34 Although it can synthesize | combine by the method of description, since a commercial item exists, it is also possible to obtain and use this commercial item.

Content of the alkyl resorcinol in the external preparation for skin of this invention is 0.001-1.0 mass% with respect to the skin external preparation whole quantity, and it is preferable that it is 0.005-0.5 mass%. Below the lower limit, the whitening effect may be insufficient, which is not preferable. Moreover, if it is more than an upper limit, the whole quantity may not be delivered efficiently into the skin, which is not preferable.

<2> Phospholipid as component of liquid crystal in external preparation for skin of the present invention The external preparation for skin of the present invention is prepared via a liquid crystal phase containing phospholipid as a constituent. Specific examples of the phospholipid include lecithin, hydrogenated lecithin, hydroxylated lecithin, sphingophospholipid and the like. Since there are many commercial products of these phospholipids, they can be obtained and used. In the present invention, lecithin, hydrogenated lecithin, and hydroxylated lecithin are particularly preferred as the phospholipid because the liquid crystal phase formed is stable. Since there are many commercial products of these phospholipids, they can be obtained and used.

The content of the phospholipid in the external preparation for skin of the present invention is preferably 0.1 to 5.0 mass%, more preferably 0.5 to 2.0 mass% with respect to the total amount of external preparation for skin. preferable. Even if it is less than the lower limit value or more than the upper limit value, a liquid crystal phase capable of maintaining stability through the emulsification process may not be formed, which is not preferable.

<3> Polyglycerin fatty acid ester which is a constituent of liquid crystal in external preparation for skin of the present invention The external preparation for skin of the present invention is prepared via a liquid crystal layer containing polyglycerol fatty acid ester as a constituent. . Since a stable liquid crystal phase is formed, the polymerization degree of glycerol of the polyglycerol fatty acid ester is preferably 2 to 10, more preferably 2 to 4, and the fatty acid is unsaturated or branched having 6 to 20 carbon atoms. Are preferred, among which oleic acid and isostearic acid are particularly preferred. Moreover, since a stable liquid crystal phase is formed, monoester and diester of polyglycerol are preferable. Since there are many commercially available products of these polyglycerin fatty acid esters, they can be obtained and used.

The content of the polyglycerol fatty acid ester in the external preparation for skin of the present invention is preferably 0.005 to 1.0 mass%, and preferably 0.01 to 0.5 mass%, based on the total amount of external preparation for skin. Is more preferable. Even if it is less than the lower limit value or more than the upper limit value, a liquid crystal phase capable of maintaining stability through the emulsification process may not be formed, which is not preferable.

<4> Polyhydric alcohol which is a constituent of liquid crystal in the external preparation for skin of the present invention The liquid crystal phase in the external preparation for skin of the present invention contains a polyhydric alcohol as a constituent. In the present invention, the polyhydric alcohol serves as a solvent for dissolving the other constituent components, phospholipid and polyglycerin fatty acid ester, and is not particularly limited as long as both components can be dissolved uniformly. Glycerin and diglycerin are particularly preferable from the viewpoint of the ease of formation of the liquid crystal and the stability of the liquid crystal formed.

The content of the polyhydric alcohol in the external preparation for skin of the present invention is preferably 5 to 40% by mass, and more preferably 10 to 30% by mass with respect to the total amount of the external preparation for skin. Even if it is less than the lower limit value or more than the upper limit value, a liquid crystal phase capable of maintaining stability through the emulsification process may not be formed, which is not preferable.

<5> External preparation for skin of the present invention The external preparation for skin of the present invention contains an alkylresorcinol as an essential component, and is prepared via a liquid crystal phase containing phospholipid, polyglycerin fatty acid ester and polyhydric alcohol as constituent components. It is characterized by that.
Moreover, the skin external preparation of this invention can contain the arbitrary component normally used with a skin external preparation other than the said essential component in the range which does not impair the effect of invention. 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, hardened coconut oil, hardened Oil, molasses, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, botarou, lanolin, reduced lanolin, hard lanolin, jojoba oil, waxes, liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, petrolatum, micro Hydrocarbons such as crystallin wax, oleic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, higher fatty acids such as stearic acid, behenic acid, undecylenic acid, cetyl alcohol, stearyl alcohol, isostearyl High 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 methylphenylpolysiloxane Sun, chain polysiloxane such as diphenylpolysiloxane, cyclic polysiloxane such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexanesiloxane, amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, Modified polysiloxanes such as fluorine-modified polysiloxanes, partially crosslinked polysiloxanes, fatty acid soaps (sodium laurate, sodium palmitate, etc.), anionic surfactants such as potassium lauryl sulfate, triethanolamine ether alkyl sulfate, stearyltrimethyl chloride Cationic surfactants such as ammonium, benzalkonium chloride, laurylamine oxide, imidazoline-based amphoteric surfactants (2-cocoyl-2-imidazoli Nium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine surfactants (alkyl betaine, amide betaine, sulfobetaine, etc.), amphoteric surfactants such as acylmethyltaurine, sorbitan fatty acid esters (sorbitan mono) Stearates, sorbitan sesquioleate, etc.), glycerin fatty acids (glyceryl monostearate, etc.), propylene glycol fatty acid esters (propylene glycol monostearate, etc.), 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-sorbite monolaurate, etc.), POE glycerin fatty acid ester (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) ), 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.), Sho Nonionic surfactants such as sugar fatty acid esters and alkyl glucosides, moisturizing ingredients such as sodium pyrrolidone carboxylate, lactic acid and sodium lactate, guar gum, quince seed, carrageenan, galactan, gum arabic, Chin, mannan, starch, xanthan gum, curdlan, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, chondroitin sulfate, dermatan sulfate, glycogen, heparan sulfate, hyaluronic acid, sodium hyaluronate, tragacanth gum, keratan sulfate, chondroitin, mucoitin Sulfuric acid, hydroxyethyl guar gum, carboxymethyl guar gum, dextran, keratosulfuric acid, locust bean gum, succinoglucan, carolinic acid, chitin, chitosan, carboxymethylchitin, agar, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, sodium polyacrylate , Polyethylene glycol, thickeners such as bentonite, dextrin fat Gelling agents such as acid esters, surface-treated mica, talc, kaolin, synthetic mica, calcium carbonate, magnesium carbonate, silicic anhydride (silica), aluminum oxide, barium sulfate and other powders, surface Cobalt oxide, ultramarine blue, bitumen, zinc oxide inorganic pigments that may be treated, composite pigments such as iron oxide titanium dioxide sintered bodies that may be surface treated, surface treated, mica Pearl agents 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 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 liethylene powder, polymethyl methacrylate, nylon powder, organopolysiloxane elastomer, lower alcohols such as ethanol and isopropanol, paraaminobenzoic acid UV absorbers, anthranilic acid UV absorbers, salicylic acid UV absorbers , UV absorbers such as cinnamic acid UV absorbers, vitamin A or derivatives thereof, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 or derivatives thereof, vitamin B12, vitamin B15 or derivatives thereof, etc. Vitamin B, α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E such as vitamin E acetate, vitamin D, vitamin H, pantothenic acid, panthetin, pyrroloquinoline quinone and other vitamins It can Mashiku example.

  Examples of the external preparation for skin of the present invention include emulsions and creams. Moreover, as the manufacturing method, since the liquid crystal phase which can maintain stability can be formed through the emulsification process, water was added to the polyhydric alcohol phase containing phospholipid and polyglycerin fatty acid ester to form the liquid crystal phase. Thereafter, it is preferable to adopt a production method in which an oil phase containing one or more alkylresorcinols and then an aqueous phase are sequentially added to the liquid crystal layer phase and emulsified to prepare.

EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to a following example.
<Examples 1 to 6, Comparative Example 1>
According to the prescription of Table 1, the emulsion which is a skin external preparation of this invention and the emulsion of a comparative example were created. That is, component (a) was heated to 65 ° C. and mixed with stirring to obtain a uniform solution. To this solution, the component (b) heated to 65 ° C. was added with stirring. While continuing to stir, the mixture was heated to 65 ° C., stirred and mixed (c), and then (2) was gradually added, followed by emulsification with a homomixer,
After adding the component (e) heated and stirred to 65 ° C., the mixture was cooled to room temperature to obtain an emulsion. When each component was mixed, observation with a polarizing microscope was performed to confirm the presence or absence of polarized light. (If the liquid crystal is formed, polarized light is observed.) The observation results are shown in Table 2. In addition, the number in Table 1 represents mass%.

<Comparative example 2>
According to the prescription in Table 3, a vesicle-dispersed cosmetic was prepared. That is, the components shown in Table 3 were heated to 85 ° C. and stirred and mixed, and then stirring was continued for 30 minutes. After that, the mixture was stirred using a high-pressure emulsifier and then cooled to room temperature to obtain a cosmetic. The numbers in Table 3 represent mass%.

<Test Example 1> Measurement of transdermal absorbability After the pig skin was attached to the diffusion cell, physiological saline was filled in the lower part of the cell until there was no air between the pig skin. Thereafter, the skin external preparations of Examples 1 to 6 and Comparative Examples 1 and 2 were collected on the upper part of the diffusion cell and left for 24 hours while stirring the lower physiological saline. Thereafter, the amount of alkylresorcinol in the lower part of the cell was quantified by HPLT, the ratio to the content in the external preparation for skin was determined, and the transdermal absorbability was determined. The results are shown in Table 4.

<Test Example 2> Evaluation of moisturizing effect After washing the inner forearm portion of the panel, 10 mg of the skin external preparations of Examples 1 to 6 and Comparative Examples 1 and 2 were applied. After leaving it to stand for 30 minutes, wash the application area with soap and lightly wipe off the moisture with a towel, and then measure the impedance value of the application area using an impedance meter (SKICON-200EX manufactured by IBI S Co., Ltd.). Then, the increment from the value before application of the external preparation for skin was determined. The results are shown in Table 4. The larger the increment value, the higher the moisturizing effect.

<Test Example 3> Sensory evaluation of penetrating feeling and moisturizing feeling The penetrating feeling and moisturizing feeling when the skin external preparations of Examples 1 to 6 and Comparative Examples 1 and 2 were applied to the skin were evaluated according to the following evaluation criteria. Evaluation was performed by five skilled workers, and the average value was used as the evaluation value. The results are shown in Table 4.
Evaluation criteria: Penetration feeling and moisturizing feeling are considerably higher than those of Comparative Example 2 ... 5 points ... 4 points equivalent ... ······································································· 1 point

<Test Example 4> Evaluation of whitening effect A panel with a dull skin was applied daily to the skin preparations of Examples 1 to 6 and Comparative Examples 1 to 2, and after 6 months, the skin was examined using a spectrophotometer. The L value was measured, and the difference from the L value of the skin before the start of the test was determined. The results are shown in Table 4.

表４より明らかなように、本発明の皮膚外用剤は美白効果の肌内部への浸透性及び保湿効果にも優れていることがわかる。また、優れた経皮吸収性により、高い美白効果が得られることもわかる。

As is apparent from Table 4, it can be seen that the skin external preparation of the present invention is excellent in the whitening effect of penetration into the skin and the moisturizing effect. Moreover, it turns out that a high whitening effect is acquired by the outstanding transdermal absorbability.

<Test Example 5> Evaluation of Storage Stability After the skin external preparations of Examples 1 to 6 were stored at 40 ° C. for 6 months, the transdermal absorbability was measured with a polarizing microscope in the same manner as Test Example 1. The results are shown in Table 5.

  The present invention can be used as a skin care cosmetic.

Claims (6)

A skin external preparation characterized by containing one or more alkylresorcinols and being prepared via a liquid crystal phase. The external preparation for skin according to claim 1, wherein the liquid crystal phase comprises the following components (A) to (C) as constituent components.
(A) Polyhydric alcohol (B) Phospholipid (C) Polyglycerin fatty acid ester The skin external preparation according to claim 1 or 2, wherein the polyglycerol ester is one or more selected from the group consisting of a fatty acid monoester of polyglycerol and a fatty acid diester of polyglycerol. After water is added to the polyhydric alcohol phase containing phospholipid and polyglycerin fatty acid to form a liquid crystal phase, the liquid crystal layer phase contains an oil phase containing one or more of alkylresorcinol, and then water. The external preparation for skin according to any one of claims 1 to 3, which is prepared by sequentially adding phases and emulsifying. After water is added to the polyhydric alcohol phase containing phospholipid and polyglycerin fatty acid to form a liquid crystal phase, the liquid crystal layer phase contains an oil phase containing one or more of alkylresorcinol, and then water. A method for producing an external preparation for skin, which is prepared by sequentially adding phases and emulsifying. The method for producing a skin external preparation according to claim 5, wherein the polyglycerol ester is one or more selected from the group consisting of a fatty acid monoester of polyglycerol and a fatty acid diester of polyglycerol.