COMPOSITION FOR DERMATOLOGIC PREPARATION

Abstract: A composition for dermatologic preparation containing vitamin A (retinol) and a stabilizer comprising chelating agent/polysaccharide, oil, polyethylene (propylene) glycol, hydroxy carboxylic acid salt, neutral amino acid salt, oil-soluble antioxidant/EDTA/benzophenone compound, oil-soluble antioxidant/acid/benzophenone compound, a clathrate cyclodextrin containing antioxidant and/or ultraviolet absorber included therein, butanediol and/or oil-soluble antioxidant, water-soluble benzophenone compound, basic amino acid and its salt, acidic amino acid and its salt, polar oil, or water-swellable clayey mineral.

Description: TECHNICAL FIELD The present invention relates to an external skin treatment composition in which the stability of vitamin A is extremely improved. BACKGROUND ART It has been well known that vitamin A is effective for prevention or treatment of keratodermatitis and, prevention of and recovery from dermal aging. Vitamin A, however, is structurally very unstable and can readily cause isomerization, decomposition, polymerization, etc., with light, air, heat, metal ion, etc. Thus, it has been difficult to stably formulate vitamin A into an external skin treatment composition. SUMMARY OF THE INVENTION Accordingly, the present invention relates to an external skin treatment composition in which the stability of vitamin A is extremely improved by formulating a stabilizer for improving the stability of vitamin A. In accordance with the present invention, there is provided an external skin treatment composition comprising (I) vitamin A selected from the group consisting of retinol, all-trans type retinol and 13-cis type retinol and (II) a stabilizer consisting of chelating agents and polysaccharides. BEST MODE FOR CARRYING OUT THE INVENTION In consideration of the above circumstances, the present inventors have conducted extensive study and research efforts. As a result, it has been found that the stability of vitamin A is extremely improved by formulating the specified stabilizer therein. Thus the present invention has been achieved. The present invention will be described in detail below. As vitamin A used in the present invention, vitamin A (also called retinol), all-trans type vitamin A or 13-cis type vitamin A is used. A mixture thereof can also be used. The amount of vitamin A to be formulated into the external skin treatment composition according to the present invention is not particularly limited. However, if the effect on the skin as a function of vitamin A is taking into consideration, the amount is 0.0001% by weight or more, based upon the total weight of the composition. If further effects of vitamin A are required, 0.001% by weight or more of the same is preferably used. The upper limit of the formulation amount is preferably 1% by weight in view of the properties as an external skin treatment composition. According to the present invention, as a stabilizer, the combination of a chelating agent and a polysaccharide is used. As a chelating agent used in the present invention, mention may be made of inorganic alkali salts of ethylenediaminetetraacetate such as sodium salts and potassium salts thereof, organic alkali salts of ethylenediaminetetraacetate such as ethanolamines salts thereof (mono, di, tri and tetra salts), citric acid and inorganic alkali salts of citric acid such as sodium and potassium salts thereof, organic alkali salts of citric acid such as ethanolamine salts and basic amino acid salts thereof (mono, di, tri salts); metaphosphoric acid salts, polyphosphoric acid salts, tartaric acid salts. The amount of a chelating agent to be formulated in accordance with the present invention is 0.001% by weight or more and the upper limit of the formulation amount cannot be particularly limited. However, when an extremely large amount of the agent is formulated, although the effects of the present invention are not impaired, crystals of the agent are possibly deposited or undesirable phenomena may occur, so that qualities as external skin treatment compositions cannot be maintained. The formulation amount is preferably 1% by weight or less. As polysaccharides used in the present invention, mention may be made of cellulose, quinsseed, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, gum traganth, keratan sulfate, chondroitin, gum xanthane, mucoitin sulfate, guargum, dextran, keratosulfate, locust bean gum, succinoglucan, charonin, and the salts thereof. The amount of polysaccharides to be formulated into the external skin treatment composition of the present invention is not particularly limited in view of the effects of the present invention. However, it is preferably 0.00001 to 5.0% by weight. As a chelating agent used in the present invention, mention may be made of inorganic alkali salts such as sodium salts and potassium salts of ethylenediaminetetraacetate, organic alkali salts such as ethanol amines salts of ethylenediaminetetraacetate (mono, di, tri and tetra salts), citric acid and inorganic alkali salts such as sodium and potassium salts of citric acid, organic alkali salts such as ethanol amine salts and basic amino acid salts of citric acid (mono, di, tri and tetra salts). Further, metaphosphoric acid salts or polyphosphoric acid salts can be used. One or two or more kinds thereof are included in the present composition. The formulation amount thereof for the purpose of exhibiting the effects of the present invention is required to be 0.001% by weight or more. Further, even if an excess amount of the same is formulated, the effects of the present invention are not impaired. However, if an extremely large amount of the same is formulated, crystals can be precipitated so that the qualities as external skin treatment compositions can sometimes be impaired. Thus, caution should be taken not to impair the qualities of the composition. The formulation amount is preferably 1% by weight or less. In addition to the above-described essential components, the external skin treatment composition according to the present invention can optionally contain a conventional base material of the external skin treatment composition usually used in cosmetics and quasi-drugs and other conventional components such as humectant, surfactant, preservative, water, alcohol, thickener, oil, drug, perfume, colorant, and ultraviolet absorber in an amount which does not deteriorate the effects of the present invention. The composition can be converted to liquid, gel, paste, cream, powder and solid form. EXAMPLE The present invention will be further described in more detail, by, but by no means limited to, the following Examples. Production method and temperature test method of Examples 1-1, 1-2 and Comparative Examples 1-1, 1-2 Each oil component is completely dissolved at 60°C, and then has added thereto a solution of POE(10) oleyl ether, edetic acid salt, ethanol and dipropylene glycol dissolved in purified water, followed by cooling the resulting solution to 40°C. Thereafter, vitamin A is completely dissolved therein, and the solution is sealed in a brown glass sample tube. The tube is further wrapped with aluminum foil to completely cut light and is stored in a constant temperature bath at 40°C. Cosmetic oil formulation and vitamin A quantitative determination results (% by weight) Example 1-1 Example 1-2 Comp. Example 1-1 Vitamin A 0.01 0.02 0.01 Disodium edetate 0.001 0.005 - Hyaluronic acid 0.001 0.001 - Purified water 0.1 0.2 - Glycerol tri 2-ethylhexanoate triglyceride balance balance balance Isopropyl myristate 10 35 10 Squalane 15 15 15 Dipropylene glycol 15 15 15 Ethanol 8 8 8 POE(10) oleyl ether 2 2 2 Vitamin A quantitative determination value Immediately after preparation (%) 100 100 100 After two weeks at 40°C (%) 93 98 56 In Examples 1-1 and 1-2, the stability of vitamin A is improved as compared with Comparative Example 1-1. This is the effect according to the present invention. Quantitative determination method of vitamin A According to the absorbance determination method at 325 nm using ethanol as a solvent, the quantitative determination was effected. In the calculation, at the maximum absorption 325 nm, E (1%, 1 cm) = 1835 was used. Emulsion formulation and vitamin A quantitative determination results (% by weight) Example 1-3 Example 1-4 Comp. Ex. 1-3 Comp. Ex. 1-3 Vitamin A 0.03 0.001 0.03 0.001 Disodium edetate 0.01 - - - Trisodium citrate 0.02 0.02 - - Cetylisoocatnoate 10 7 10 7 Glycerol 2-ethylhexanoate 2 4 2 4 Squalane 2 2 2 2 Cetyl alcohol 2 2 2 2 Vaseline 1 1 1 1 Glyceryl monostearate 1.5 1.5 1.5 1.5 POE(60) hardened castor oil 1.3 1.3 1.3 1.3 Carboxyvinyl polymer 0.2 0.3 0.2 0.3 Gum xanthane 0.05 0.1 - - Caustic potash 0.06 0.08 0.06 0.08 Glycerol 10 10 10 10 Propylene glycol 3 3 3 3 Ethyl paraben 0.2 0.2 0.2 0.2 Purified water To total amount 100 Vitamin A quantitative determination value Immediately after preparation (%) 100 100 100 100 After one month at 40°C (%) 95 97 31 38 In Examples 1-3 and 1-4, the stability of vitamin A is improved as compared with Comparative Example. This is the effect according to the present invention. Cosmetic lotion and vitamin A quantitative determination results (% by weight) Example 1-5 Example 1-6 Example 1-7 Comp. Ex. 1-4 Disodium edetate 0.5 - 0.05 - Tetrapotassium edetate - 0.3 0.05 - Sodium hyaluronate 0.1 0.05 - - Sodium chondroitin sulfate - - 0.2 - Ethanol 5.0 5.0 5.0 5.0 Methyl paraben 0.1 0.1 0.1 0.1 Vitamin A 0.0001 0.0001 0.0001 0.0001 Octadodecanol 0.001 0.001 0.001 0.001 POE(60) hardened castor oil 0.4 0.4 0.4 0.4 Lactic acid 0.01 0.01 0.01 0.01 Sodium lactate 0.1 0.1 0.1 0.1 Glycerol 2.0 2.0 2.0 2.0 Purified water To total amount 100 Vitamin A quantitative determination value Immediately after preparation (%) 100 100 100 100 After two weeks at 40°C (%) 95 93 91 49 In Examples 1-5, 1-6, and 1-7, the stability of vitamin A is improved as compared with Comparative Example. This is the effect according to the present invention. Example 1-8: Cosmetic lotion (% by weight) Oleyl alcohol 0.005 Vitamin A 0.0001 POE(50) oleyl ether 0.7 Trisodium edetate 1 Lactic acid 0.01 Sodium lactate 0.09 Sodium chondroitin sulfate 0.1 Ethanol 8 Glycerol 2 Methyl paraben 0.2 Purified water To total amount 100 Example 1-9: Cream (% by weight) Squalane 15 Glycerol tri 2-ethylhexanoate 8 Isopropylmyristate 7 Vitamin A 0.3 Vaseline 2 Butyl paraben 0.1 Propyl paraben 0.1 Glycerol monooleate 3 Diglyceroldiisostearate 2 PEG400 dioleate 1 Glycerol 10 Cellulose powder 1 Dipropylene glycol 5 Disodium edetate 0.01 Triethanolamine 0.02 Purified water To total amount 100 Example 1-10: Oilessence (% by weight) Glycerol tri 2-ethylhexanoate 50 Octyldodecanol 20 Squalane 10 Vitamin A 1 Dibutylphthalate 9 Ethyl alcohol 9.989 Cellulose powder 0.01 Sodium edetate 0.001 Example 1-11: Oil gel (% by weight) Glycerol tri 2-ethylhexanoate 60 POE(20) octyldodecylether 16 Vitamin A 0.1 Glycerol 16 Sodium hyaluronate 0.01 Disodium edetate 0.05 Purified water To total amount 100 Example 1-12: Cream (% by weight) Cetostearyl alcohol 3.5 Squalane 30.0 Beeswax 3.0 Reduced lanolin 5.0 Ethyl paraben 0.3 POE(50) Oleyl alcohol ether 2.0 Glycerol monostearate 2.0 Diethanol amine edetate 0.01 Perfume 0.03 Vitamin A 0.0001 Dermatan sulfate 0.1 Glycerol 15.0 Purified water balance Example 1-13: Pack (% by weight) Gum xanthane 1.0 Polyvinyl alcohol 10.0 Propylene glycol 7.0 Ethanol 10.0 Vitamin A 0.01 Monosodium edetate 0.1 Methyl paraben 0.05 POE(60) hydrogenated castor oil 0.2 Perfume 0.05 Purified water balance Example 1-14: Compact face powder (% by weight) Vitamin A 0.0005 Talc 85.4 Stearic acid 2.5 Squalane 3.5 Sorbitansesquioleate 1.8 Triethanolamine 1.2 Quinsseed 0.001 Salt of edetic acid 0.001 Pigment q.s. Perfume q.s. Example 1-15: Lipstick (% by weight) Vitamin A 0.00001 Microcrystalline wax 3.0 Bees wax 3.0 Ceresin wax 5.0 Liquid paraffin 19.0 Squalane 20.0 Carnauba wax 3.0 Candellira wax 3.0 Gum arabic 0.01 Monosodium salt of edetic acid 0.01 Color controlling colorant 7.0 Dibutylhydroxytoluene 0.05 Perfume q.s. Lanolin balance Example 1-16: Emulsion (% by weight) Vitamin A 1.0 Hyaluronic acid 0.1 Tetraethanol amine edetate 1.0 Ethanol 2.0 Glycerol 10.0 Propylene glycol 3.0 Carboxyvinyl polymer 0.3 KOH 0.1 Methyl paraben 0.1 Cetanol 2.5 Vaseline 2.0 Squalane 10.0 Isopropyl myristate 5.0 Glycerylmonostearate 2.0 POE(25) Cetyl ether 2.0 Purified water balance Example 1-17: Emulsion (% by weight) Vitamin A 0.3 Chondroitin sulfate 0.01 Trisodium citrate 0.1 Ethanol 5.0 Glycerol 5.0 Propylene glycol 5.0 Carboxyvinyl polymer 0.2 KOH 0.06 Methyl paraben 0.2 POE(60) Hydrogenated castor oil 1.0 Squalane 3.0 Isopropyl myristate 3.0 Purified water balance The external skin treatment compositions of Examples 1-8 to 1-17 were excellent in the stability of vitamin A in daily use. As described hereinabove, in the external skin treatment composition of the present invention, by formulating one or more chelating agents and polysaccharides such as hyaluronic acid and chondroitin sulfate, the stability of vitamin A can be extremely improved

Claims: An external skin treatment composition comprising (I) vitamin A selected from the group consisting of retinol, all-trans type retinol and 13-cis type retinol and (II) a stabilizer consisting of chelating agents and polysaccharides. A composition as claimed in claim 1, wherein the composition comprises 0.0001% by weight or more of vitamin A, 0.001% by weight or more of a chelating agent and 0.00001% by weight or more of a polysaccharide on the basis of the total weight of the composition. The cosmetic use of chelating agents and polysaccharides as a stabilizer for vitamin A selected from the group consisting of retinol, all-trans type retinol and 13-cis type retinol in a composition for external skin treatment. The cosmetic use according to claim 3 wherein the external skin treatment composition comprises 0.0001% by weight or more of vitamin A, 0.001% by weight or more of a chelating agent and 0.00001% by weight or more of a polysaccharide, on the basis of the total weight of the composition.

Inventors: SAKAMOTO OKIHIKO, YANAGIDA TAKESHI, SAKAMOTO, OKIHIKO, YANAGIDA, TAKESHI, SAKAMOTO, OKIHIKO THE SHISEIDO RESEARCH CENTER, YANAGIDA, TAKESHI THE SHISEIDO RESEARCH CENTER
Applicants: SHISEIDO CO LTD, SHISEIDO COMPANY, LTD.
Application year: 1993
Main classification: A61K7
IPC codes: A61K47, A61K8, A61K31, A61K45, A61Q1, A61Q19