ULTRAVIOLET LIGHT ABSORBER AND LUMINESCENT AGENT CONTAINING SILICON CLUSTER OR GERMANIUM CLUSTER, AND SKIN CARE PREPARATION FOR EXTERNAL USE, USING THE SAME CLUSTER

摘要

PROBLEM TO BE SOLVED: To obtain an ultraviolet light absorber soluble in a silicone oil, transmitting visible light, selectively adsorbing ultraviolet light and having excellent transparency, and to provide a skin care preparation for external use comprising the ultraviolet light absorber, and to obtain a new luminescent agent comprising a silicon cluster or a germanium cluster or a cluster derivative thereof.;SOLUTION: The ultraviolet light absorber is composed of a silicon cluster or a germanium cluster represented by structural formula (I) or (II): M_xR_y (I) (wherein, M is Si or Ge; R is H or OH or a solvent or a surfactant; and (x) and (y) denote each independently a number of 3-100 on the average) or M_xR_y-nQ_n (II) (wherein, M is Si or Ge; R is H or OH or a solvent or a surfactant; Q is a group without substantially affecting the ultraviolet light absorbing power of the cluster; (x), (y) and (n) denote each independently a number of 3-100 on the average) or a derivative thereof. The skin care preparation for external use comprises the ultraviolet light absorber or the luminescent agent comprises the silicon cluster or germanium cluster or the derivative thereof.;COPYRIGHT: (C)2006,JPO&NCIPI