External composition for skin

Abstract

The invention provides a skin external preparations, with excellent use feeling, stability and security even containing urea of high concentration. The retinol and / or its derivative is added in the skin external preparations containing 10 to 25 weight% of urea to increase the use feeling and stability, moisture-retention and security. Furthermore, the tocopherol and / / or its derivative is added in the skin external preparations to more markedly give play to the said effects.

Description

technical field [0001] The present invention relates to a composition for external use on skin which is excellent in usability, stability, moisture retention and safety. More specifically, the present invention relates to compositions for external use on the skin containing urea and retinol and / or derivatives thereof. Background technique [0002] Urea is a component widely used in external skin compositions as a moisturizing agent, a penetration aid, a rough skin improving agent, a skin softening agent, a cell activating agent, and the like. In order to use urea to produce significant moisturizing effect and skin softening effect, it is necessary to add a relatively high concentration of urea to the composition for external use on the skin. However, in a composition in which urea is added at a high concentration of 10% by weight or more, urea tends to be precipitated, and the original pharmacological action of urea is weakened, and the usability during application is impai...

AI Technical Summary

Problems solved by technology

However, there is no report on adding retinol or its derivatives to a composition in which urea is added at a high concentration of 10% by weight or more relative to the composition. In addition, there is no report on the addition of high-concentration urea and retinol or its derivatives. The effect brought by the combination of substances is also unknown