Patent ID: 7722899

Claim:
A surface-treated powder which is obtained by treating a surface of said powder with an acrylic/silicone copolymer having at least one hydrolyzable silyl group in its molecule so that said copolymer is adsorbed on the surface of the powder, then dried and sintered, wherein the powder is at least one selected from the group consisting of inorganic powders, organic powders, surfactant metal salt powders, colored pigments, pearl pigments, metal powder pigments and natural pigments; and the proportion of the acrylic/silicone copolymer relative to 100 wt parts of the powder before surface treatment is 0.1-30 wt parts; wherein the acrylic/silicone copolymer is obtained by copolymerization of 1-97 wt % of an organopolysilixane compound of formula (1): wherein, A is a radical polymerizing group of formula (4) or (5): CH 2 ═C(R 2 )COOR 3 — (4) CH 2 ═C(R 2 )C 6 H 5 — (5) wherein R 2 is hydrogen or methyl, R 3 is an alkylene group having 1-10 carbon atoms, and n is 3-500, R 1 are organic groups selected from alkyl groups, aryl, aralkyl and fluorine-substituted alkyl groups having 1-30 carbon atoms, which are identical or different; and 2-95 wt % of the acrylic monomer of formula (2): CH 2 ═C(R 4 )COOR 5 (2) wherein, R 4 is hydrogen or methyl, and R 5 is an alkyl group having 1-30 carbon atoms; and 1-10 wt % of the radical polymerizing silane compound of formula (3): B—Si(CH 3 ) 3-m (OR 6 ) m (3) wherein, B is a radical polymerizing of formula (6) or (7): CH 2 ═C(R 7 )COOR 8 — (6) CH 2 ═C(R 7 )C 6 H 5 — (7) wherein, R 7 is hydrogen or methyl, R 8 is an alkylene group having 1-10 carbon atoms, R 6 is an alkyl group or alkenyl group having 1-4 carbon atoms, and m is 1-3.