NOVEL AMINO ACID SILICON POLYMERS, PROCESS FOR PREPARATION THEREOF, COSMETIC POWDER SURFACE-TREATED WITH AMINO ACID SILICON POLYMERS AND COLOR COSMETIC COMPOSITION CONTAINING SAME

摘要

PURPOSE: A process for preparing novel amino acid silicon polymers substituted with amino acid on both ends by reacting a functional silicon polymer containing a silanol group on both ends of a polymer chain with amino acid is provided, whereby surface-modified cosmetic powder and color cosmetic compositions having excellent skin adhesion and feeling in use and exhibiting cosmetic effects are produced. CONSTITUTION: The amino acid silicon polymer of formula 5 is prepared by esterification of one or more amino acids selected from dimethyl polysiloxanol of formula 1 having a viscosity of 20 to 20,000Cps and acidic amino acid of formula 2 using a catalyst in an organic solvent. In formula, n is an integer from 1 to 1,000, k is an integer from 1 to 2, k, k' are each independently an integer from 1 to 2.