| abstract |
The present invention provides a novel surface treating agent that imparts excellent hydrophobicity to a powder, remarkably improves its washing-off property, and further remarkably improves the dispersibility of the powder. To provide a surface-treated powder having a high transparency when applied to the skin and having a smooth feel when used, and a cosmetic containing the same. A surface treatment agent comprising a monomer (A) represented by the following general formula (1) as a constituent monomer, the monomer comprising a polymer polymerized by living radical polymerization. Wherein R 1 is hydrogen or an alkyl group having 1 to 3 carbon atoms, R 2 is an alkylene group having 4 to 22 carbon atoms, X 1 is an —NH— group or an oxygen atom, M 1 is hydrogen or a monovalent metal. Represents an atom.) [Selection figure] None |