Patent ID: 7393911

Claim:
Organosilicon fine particles comprising polysiloxane network structure having a circular ring shape as a whole, having an average outer diameter of 0.05-15 μm and an average inner diameter of 0.01-10 μm, wherein the difference between said average outer diameter and said average inner diameter is in the range of 0.04-5 μm; wherein said polysiloxane network structure comprises siloxane units given respectively by formulas (1), (2), (3), (4), (5) and (6) shown below: SiO 4/2 formula (1) Si(OH)O 3/2 formula (2) R 1 SiO 3/2 formula (3) R 2 SiO 3/2 formula (4) R 3 Si(OH)O 2/2 formula (5) R 4 Si(OH)O 2/2 formula (6) where R 1 and R 3 are each nonreactive hydrocarbon group and R 2 and R 4 are each organic group having reactive group selected from the group consisting of acryloxy group, methacryloxy group, vinyl group and mercapto group; and wherein the molar ratio of (siloxane unit shown by formula (1))/(siloxane units shown by formulas (2), (3), (4), (5) and (6)) is 20/80-50/50, the molar ratio of (siloxane units shown by formulas (2), (3) and (4))/(siloxane units shown by formulas (5) and (6)) is 50/50-75/25, and the molar ratio of (siloxane units shown by formulas (3) and (5))/(siloxane units shown by formulas (4) and (6)) is 20/80-60/40.