JPH06321765A - Skin beautifying agent - Google Patents

Abstract

PURPOSE:To obtain a skin beautifying agent containing a diphenyl ether derivative as an active component, having excellent skin beautifying effect and preventing and dissipating effect on pigmentation and useful for the prevention and treatment of spots and freckles caused by sunburn, etc. CONSTITUTION:This skin beautifying agent contains 0.00001-10wt.%, preferably 0.0001-5wt.% of a compound of the formula (R<1> and R<5> are H or lower alkyl; R<2> is H or methyl; R<3> and R<4> are H or Cl) as an active component. A cosmetics is provided which is properly incorporated, in addition to the compound of the formula, with oil, humectant, thickener, antiseptic, emulsifier, pigment, powder, pH modifier, medicinal component, ultraviolet absorber, antioxidant, perfume, etc., and prepared in the form of cream, milky lotion, face lotion, foundation, pack, lotion, gel, solution, stick, etc. The compound of the formula suppresses melanogenesis of melanocyte, dissipates the deposited melanin pigment formed by the stimulation of ultraviolet rays and has high safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a whitening agent and a skin cosmetic, and more specifically, it suppresses the formation of melanin in melanocytes, has an excellent whitening effect on the skin after UV irradiation, and prevents spots and freckles due to sunburn etc. And skin care products that can be treated.

[0002]

2. Description of the Related Art Pigments, freckles, and pigmentation on the skin after sunburn are less likely to occur, increase, or disappear with age, which is a problem for middle-aged and older people. Although the pathogenic mechanism of these pigmentation diseases has not been clarified yet,
It is considered that the mechanism of melanin synthesis in epidermal melanocytes was enhanced by the action of sunlight, especially ultraviolet rays, and melanocyte-stimulating hormone. Moreover, it is considered that the delay in keratinization of epidermal keratinocytes (keratinocytes) with aging also causes an increase in the density of melanin granules in the epidermis, that is, a clinically symptomatic increase in pigmentation. These pigmented areas are localized and may be distinctly different from the surrounding normal skin color.

There is a strong demand for the development of a drug capable of recovering such an acquired pigment (ie, melanin) deposit to a normal skin color, and many drugs have been commercialized so far. For example, in recent years, vitamin C has an excellent reducing ability.
Cosmetics containing a (L-ascorbic acid) derivative have also been used. However, this also has a difficulty in stability, and almost no effect is observed for external use. On the other hand, in Europe and America, it is known that hydroquinone has a therapeutic effect on spots and an effect to whiten black skin, but these also have problems in safety of the substance itself (irritation, allergenicity), and Compounding as a drug is problematic in that it may cause vitiligo in some cases. In addition, various components such as isoflavone derivatives (Japanese Patent Laid-Open No. 58-58
225004) and p-hydroxycinnamic acid derivatives as cinnamic acid derivatives (JP-A-59-196813) are known as melanin inhibitors.

[0004]

However, at present, no substance is known that has a sufficient pigmentation preventing / ameliorating effect and compoundability with a cosmetic base. Therefore, an object of the present invention is to provide a component having an excellent whitening effect and useful as a cosmetic, and a skin cosmetic containing the same.

[0005]

[Means for Solving the Problems] Therefore, the inventors of the present invention have earnestly sought to obtain a substance that suppresses melanin production in melanocytes and reduces or eliminates pigmentation due to external stimuli such as ultraviolet rays through the study of melanin production mechanism. As a result of investigation, it was found that the diphenyl ether derivative represented by the following general formula (1) has an excellent pigmentation preventing / ameliorating effect, and that a good skin cosmetic can be obtained by blending this, and the present invention was completed. Came to do.

That is, the present invention has the following general formula (1):

[0007]

[Chemical 2]

[Wherein R ¹ and R ⁵ represent a hydrogen atom or a lower alkyl group, R ² represents a hydrogen atom or a methyl group, and R ³ and R ⁴ represent a hydrogen atom or a chlorine atom]. It provides a whitening agent.

The present invention also provides a skin cosmetic containing the diphenyl ether derivative (1).

The compound (1) which is an active ingredient of the skin cosmetic of the present invention has an endothelin receptor antagonistic action,
It is known to be useful as a therapeutic agent for myocardial infarction and acute renal failure [JP-A-4-134048, Satoshi Omura, "Search for new cell function-regulating substances and elucidation of their functions", Summary 1
5-16, 1992], the effect of the compound on the skin is completely unknown.

In the above general formula (1), the lower alkyl group represented by R ¹ and R ⁵ is a methyl group, an ethyl group or n.
Examples thereof include a linear or branched alkyl group having 1 to 5 carbon atoms such as -propyl group, isopropyl group, n-butyl group, and n-pentyl group.

The compound (1) is contained in the skin cosmetic of the present invention in an amount of 0.00001 to 10% by weight (hereinafter, simply represented by%),
It is particularly preferable to add 0.0001 to 5%.

Further, in addition to the above-mentioned essential components, the skin cosmetic of the present invention includes various optional components used in ordinary cosmetics, quasi drugs, pharmaceuticals, etc., such as oils, humectants, thickeners, and antiseptics. Agents, emulsifiers, pigments, powders, pH adjusters, medicinal components, ultraviolet absorbers, antioxidants, fragrances and the like can be appropriately added.

Specific examples of the oil agent include liquid paraffin, petrolatum, paraffin wax, squalane, beeswax, carnauba wax, olive oil, lanolin, higher alcohols, fatty acids, synthetic ester oils of higher alcohols and fatty acids, silicone oils, and the like. Examples of moisturizers include sorbitol, xylitol, glycerin, maltitol, propylene glycol, sodium pyrrolidonecarboxylate, polyoxypropylene fatty acid ester, polyethylene glycol, and the like, and thickeners include carboxyvinyl polymer, carboxymethylcellulose, polyvinyl alcohol, carrageenan. , Water-soluble polymers such as gelatin, electrolytes such as sodium chloride and potassium chloride, and preservatives such as methylparaben, ethylparaben, propylpa Ben, butyl paraben, sodium benzoate and the like can be mentioned. As the emulsifier, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester. , Nonionic surfactants such as polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol fatty acid ester, etc., powders such as talc, sericite, mica, kaolin, silica, bentonite, vermiculite, zinc white, mica, mica. Examples include titanium, titanium oxide, magnesium oxide, zirconium oxide, barium sulfate, red iron oxide, iron oxide, ultramarine blue, and the like, and examples of pH adjusters include buffering agents such as citric acid-sodium citrate. Examples of the medicinal component include arbutin, kojic acid, vitamin C and its derivatives, placenta extract, dipotassium glycyrrhizinate, allantoin, vitamin E derivative, pantethenic acid derivative, yoquinin, and various plant extracts.

The skin cosmetic of the present invention can be manufactured by a conventional method. Further, the skin cosmetics to be the subject of the present invention are not limited to general skin cosmetics, but include quasi drugs, external medicines, and the like, and their dosage forms are creams, emulsions, and lotions. , Foundation, pack,
A lotion form, a gel form, a solution form, a stick form, etc. can be arbitrarily selected according to the purpose.

[0016]

ACTION AND EFFECTS OF THE INVENTION The compound (1) has an action of suppressing melanin production in melanocytes and of eliminating melanin pigmentation produced by stimulation with ultraviolet rays and the like, and cosmetics containing it have an excellent whitening effect. And has a preventive and therapeutic effect on spots and freckles due to sunburn, etc.,
It is also highly safe.

[0017]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

Example 1 (Effect of Cultured Human Melanocytes on Melanin Production) Samples of various concentrations were added to a culture plate of normal human melanocytes, and the effect on cell melanin production was examined. (Test method) Normal human melanocytes (trade name: melanopack) marketed by Kurabo Industries were subcultured according to a conventional method and subjected to the present test. A sample was added to this cell culture plate so that the final concentration was 0.00001 to 100 μM, and the effect of melanocytes on melanin production after a certain period was examined. The effect on melanin production was performed by quantifying the amount of radioactive thiouracil incorporated into cells, collecting the cells, visually observing the color tone of the cell pellet, and assigning evaluation points of 1 to 4. The color tone was judged according to the judgment criteria shown in Table 1. The evaluation was shown by the average of the evaluation points of 10 culture plates.

[0019]

[Table 1]

(Results) As shown in FIG. 1, the incorporation of radioactive thiouracil into cells was 0.001 μM or more (Compound-a; R ¹ ═CH ₃ , R ² ═H, R ³ ═Cl, R ⁴
= H, R ⁵ = CH ₃ ) was found to significantly suppress the incorporation compared to untreated. Furthermore, as shown in Table 2, by visual inspection of the color tone of the cell pellet, clear whitening of cells was observed at a concentration of 1.0 μM. From the above results, the inhibitory effect of diphenyl ether derivative (1) on the melanin production of cultured human melanin-producing cells was confirmed.

[0021]

[Table 2]

Example 2 (Extinction effect on UVB pigment spots) After carefully shaving the back hair of 20 brown guinea pigs with a hair clipper and a shaver, UV rays in the UVB region were applied twice as much as the minimum erythema dose (MED). Irradiation was performed once a day for 3 days, and the amount of pigment spot elimination was examined by continuously applying an evaluation test to the test site twice a day for 1 month on the induced pigment spots. An 80% ethanol solution containing 1.0% of the diphenyl ether derivative (1) was used as a sample, and only 80% ethanol was used as a control. The evaluation was carried out by measuring with a color difference meter, calculating the L ^* value from the obtained Munsell value, and calculating the ΔL ^* (change with time) of the sample-applied site from the ΔL of the sample-uncoated (solvent only = control) site.
^The value (ΔΔL ^* ) from which ^* (change with time) was subtracted was used. Note that ΔΔL ^* is expressed by the following formula. ΔΔL ^* = (L ^* _1- L ^* ₀ )-(L ' ^* _1- L' ^* ₀ ) L ^* ₀ ; sample-applied test site before application L ' ^* ₀ ; sample-unapplied test site before application L ^* ₁ ; Sample-applied test site after 1 month of continuous application L ' ^* ₁ ; Sample-unapplied test site after 1 month of continuous application The evaluation was shown as the average value of the evaluation points of 20 test animals (Table 3).

[0023]

[Table 3]

As a result, as shown in Table 4, the composition containing the diphenyl ether derivative (1) was found to have a clear pigment spot elimination effect as compared with the control.

[0025]

[Table 4]

[0026]

Table 5 Example 2 (Cream) (Composition) (%) (1) Glycerin monostearate 5.0 (2) Polyethylene glycol monostearate 2.0 (3) Squalane 8.0 (4) Stearyl alcohol 5 0.0 (5) Glyceryl trioctanoate 8.0 (6) Dimethylpolysiloxane (50cs) 0.5 (7) Glycerin 5.0 (8) Citric acid 0.5 (9) Sodium citrate 0.5 (10) Compound-a 0.5 (11) 6-amino-n-caproic acid 0.5 (12) Purified water Remaining amount (13) Preservative proper amount (14) Perfume proper amount

[0027]

Table 6 Example 3 (Essence) (Composition) (%) (1) 1,3-butylene glycol 8.0 (2) Glycerin 4.0 (3) Xanthan gum 0.3 (4) Sodium chondroitin sulfate 0.0. 1 (5) Sodium hyaluronate 0.1 (6) Ethanol 3.0 (7) Polyoxyethylene polyoxypropylene decyl tetradecyl ether 0.5 (8) Compound-a 0.5 (9) Glycine 0.5 ( 10) Purified water Remaining amount (11) Preservative Suitable amount (12) Perfume Suitable amount

[0028]

Table 7 Example 4 (Emulsion) (Composition) (%) (1) Polyoxyethylene sorbitan tristearate 1.0 (2) Glyceryl oleate 1.0 (3) Glyceryl monostearate 0.5 (4 ) Squalane 6.0 (5) Glyceryl trioctanoate 2.0 (6) Cetyl octanoate 2.0 (7) Stearyl alcohol 2.0 (8) Octyl methoxycinnamate 2.0 (9) 1,3-butylene Glycol 5.0 (10) Glycerin 3.0 (11) Compound-b 0.5 (12) Nicotinic acid amide 1.0 (13) Purified water residual amount (14) Preservative proper amount (15) Perfume proper amount

[0029]

Table 8 Example 5 (lotion) (composition) (%) (1) 1,3-butylene glycol 6.0 (2) glycerin 4.0 (3) sodium hyaluronate 0.1 (4) ethanol 5 0.0 (5) Polyoxyethylene-oleyl ether (20 E.O.) 0.3 (6) Disodium edetate 0.1 (7) Sodium citrate 1.0 (8) Compound-c 0.5 (9 ) Ammonium chloride 0.5 (10) L-ascorbic acid phosphate magnesium 3.0 (11) Purified water Remaining amount (12) Preservative proper amount (13) Perfume proper amount

[0030]

Table 9 Example 6 (Cream foundation) (Composition) (%) (1) Dimethylpolysiloxane (6cs) 10.0 (2) Methylphenylpolysiloxane 3.0 (3) Octamethylcyclotetrasiloxane 10. 0 (4) polyoxyalkylene-modified silicone 5.0 (5) titanium oxide 5.0 (6) sericite 2.0 (7) talc 3.0 (8) red iron oxide 0.4 (9) iron oxide yellow 7 (10) Iron oxide black 0.1 (11) Glycerin 5.0 (12) Compound-a 0.2 (13) 6-amino-n-caproic acid 0.5 (14) Purified water balance (15) Preservative Suitable amount (16) Perfume Suitable amount

[0031]

Table 10 Example 7 (pack) (composition) (%) (1) dipropylene glycol 3.0 (2) polyethylene glycol 3.0 (3) 1,3-butylene glycol 1.0 (4) glycerin 2 0.0 (5) Sodium pyrrolidonecarboxylate 1.0 (6) Compound-b 0.2 (7) Lactic acid 0.5 (8) Sodium lactate 0.5 (9) Polyvinyl alcohol 12.0 (10) Ethanol 3. 0 (11) Polyoxyethylene polyoxypropylene decyl tetradecyl ether 0.3 (12) Purified water remaining amount (13) Preservative appropriate amount (14) Perfume appropriate amount

[Brief description of drawings]

FIG. 1 is a diagram showing the effect of compound-a on the intracellular uptake of radioactive thiouracil.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Genji Imokawa 1022-89 Himurocho, Utsunomiya City, Tochigi Prefecture

Claims (2)

[Claims] 1. The following general formula (1): Whitening consisting of a diphenyl ether derivative represented by the formula [wherein R ¹ and R ⁵ represent a hydrogen atom or a lower alkyl group, R ² represents a hydrogen atom or a methyl group, and R ³ and R ⁴ represent a hydrogen atom or a chlorine atom]. Agent. 2. A skin cosmetic containing the diphenyl ether derivative according to claim 1.