SURFACE TREATMENT AGENT, SURFACE-TREATED POWDER AND COSMETIC PREPARATION

摘要

Disclosed is a surface treatment agent which is capable of providing excellent water resistance and sebum resistance, while being improved in feeling of use. Specifically disclosed is a surface treatment agent characterized by containing an organosiloxane derivative which is a divalent or trivalent metal salt of a terminal carboxyl group represented by the general formula (1) below or the general formula (3) below.