Abstract: A novel silicone surfactant comprises a co-modified organopolysiloxane copolymer having a long chain alkyl group, a polyether group, and a specific average polymerization degree of its siloxane back-bone. The silicone surfactant can be used for an emulsifier (especially for a water-in-oil (W/O) type emulsifier), a surface treatment agent, a powder treatment agent, or a dispersant in a cosmetic composition or a medicament. A W/O emulsion composition comprising the silicone surfactant; a powder composition where the surface of the powder is treated using the silicone surfactant as a powder treatment agent; a powder composition further comprising an oil agent and having a form of powder in oil dispersion; and a preparation for external use, particularly a cosmetic composition or medicament, comprising the same; are also disclosed.

Abstract: A novel silicone surfactant comprises a co-modified organopolysiloxane copolymer having a long chain alkyl group, a polyether group, and a specific average polymerization degree of its siloxane back-bone. The silicone surfactant can be used for an emulsifier (especially for a water-in-oil (W/O) type emulsifier), a surface treatment agent, a powder treatment agent, or a dispersant in a cosmetic composition or a medicament. A W/O emulsion composition comprising the silicone surfactant; a powder composition where the surface of the powder is treated using the silicone surfactant as a powder treatment agent; a powder composition further comprising an oil agent and having a form of powder in oil dispersion; and a preparation for external use, particularly a cosmetic composition or medicament, comprising the same; are also disclosed.

Abstract: The invention relates to aqueous suspension of composite silicone powder, W/O emulsion and cosmetics, providing an aqueous suspension of composite silicone powder comprising: (A) a composite cured silicone powder comprising (a) a cured silicone powder, (b) an inorganic fine powder coated on the surface of said cured silicone powder, (c) at least one hydrophilic compound coating on the surface of component (a) and/or component (b); and (B) water, wherein the viscosity of said aqueous suspension is in the range of 25 to 500 mPa·s at 25 degrees C.