COMPOSITION OF PREPARATION FOR EXTERNAL USE

摘要

PROBLEM TO BE SOLVED: To provide a composition of a preparation for external use, a humec tant and a skin barrier function reinforcing agent capable of essentially improv ing a water holding ability and barrier functions of horny layers, having excel lent formulating properties and formulation stability and efficiently producible at low cost. SOLUTION: The composition for the external use, humectant and skin barrier function reinforcing agent comprise a diamide derivative represented by the following general formula (1) (wherein, R<1a> and R<1b> are each the same or different and denote each a 1-23C hydrocarbon group; R<2a> and R<2b> are each the same or different and denote each a 1-6C bivalent hydrocarbon group; R<3> s are each the same or different and denote each a 2-6C bivalent hydrocarbon group; and n denotes a number of 1-100).