| abstract |
(Problem) The external preparation for skin containing alkyl resorcinol is excellent in temperature stability (especially high temperature stability) and light stability. (Measures) (a) 0.01-5 mass% of 4-isobutyl resorcinol or its salt, and (b) L-ascorbic acid or its salt, 3-O-alkyl-L-ascorbic acid or its salt. The external preparation for skin containing 0.01-5 mass% of 1 type or 2 types or more selected. As desired, (c) a compound having a (c-1) sterol skeleton (e.g., POE phytosterols, POE cholestanol, etc.), (c-2) vitamin E derivatives, (c-3) polyglycerine You may mix | blend 1 type, or 2 or more types of compound chosen from compounds, such as a fatty acid ester, polyoxybutene polyglycerol alkyl ether, a sucrose fatty acid ester, and the compound which has (c-4) sorbitan skeleton. |