Patent ID: 7279590
Filing Date: 2007-10-09
Classification: C07F

Abstract:
1. A process for preparing organohalosilanes having the general formula (I): wherein R is a monovalent hydrocarbon group of 1 to 12 carbon atoms, X is a halogen atom, k is an integer of 1 to 3, m is an integer of 0 to 2, and the sum of k+m is 1 to 3, by reacting metallic silicon particles with an organohalide in the presence of a copper-containing catalyst, wherein a contact mass comprising the metallic silicon and a copper-containing catalyst component contains an effective amount of a catalyst powder obtained by mechanical surface treatment of a powder mixture consisting essentially of metallic powder, said metallic powder containing metallic tin powder and at least one metallic powder selected from the group consisting of copper powder, brass powder and bronze powder so as to attach the tin powder to the surface of the metal powder, wherein said catalyst powder contains 0.001 to 1% by weight of tin; and wherein said catalyst powder has a bulk specific gravity of 0.3 to 5 g/cm