Patent ID: 8263222
Filing Date: 2012-09-11
Classification: A61K,A61Q,C08G,C08J,C08K,Y10T

Abstract:
1. Organosilicone fine particles each having 20 or more faces with indefinite shapes and a network of convex parts that surround said faces with indefinite shapes on its surface, and being spherical as a whole; said organosilicone fine particles having oil absorption of 40-120 ml/100 g and comprising a polysiloxane cross-linked structures with siloxane units SiO 2 at a rate of 15-35 molar %, siloxane units R 1 SiO 1.5 at a rate of 55-75 molar %, and siloxane units R 2 R 3 SiO at a rate of 1-20 molar % such that the total is 100 molar %, where R 1 , R 2 and R 3 are each alkyl group with 1-4 carbon atoms or phenyl group; wherein said particles have an average particle size in the range of 0.1-20 μm, said average particle size being an average value obtained from 20 arbitrarily selected particles on a scanning electron microscope image of said particles, and the number of faces with indefinite shapes per particle is the observed number of faces with indefinite shapes on the particle on a scanning electron microscope image of said particles multiplied by 2; wherein said faces with indefinite shapes have an average maximum size value which is an average value calculated from the maximum size of the faces with indefinite shapes of 20 of said organosilicone fine particles arbitrarily selected from a scanning electron microscope image of said particles, and wherein 0.05≦(said average maximum size value)/(said average particle size)≦0.5; wherein said convex parts surrounding said faces with indefinite shapes have an average minimum width value calculated from the minimum widths of convex parts sandwiched by two mutually adjacent faces with indefinite shapes 20 of said particles arbitrarily selected from a scanning electron microscope image of said particles, and wherein 0.02≦(said average minimum width value)/(said average particle size)≦0.1; and wherein said network of convex parts has an average maximum height value calculated from maximum values of heights of the networks of convex parts as seen from the faces with indefinite shapes of 20 of said organosilicone fine particles arbitrarily selected from a scanning electron microscope image of said particles, and wherein 0.01≦(said average maximum height value)/(said average particle size)≦0.1.