Patent ID: 7449193

Claim:
A process for producing a silicone-treated hydrophobic powder comprising the steps of: coating a surface of a starting powder with (1) a silicone compound having at least one Si—H group or (2) a mixture of the silicone compound (I) and a silicone compound not having an Si—H group, as a first step; and then heating the silicone compound coated powder at a temperature of 260 to 480° C. for 0.1 to 24 hours, as a second step, whereby the Si—H groups of silicone compound (I) are cross-linked, wherein said silicone compound having an Si—H group is a silicone compound having the formula (I): (R 1 HSiO) a (R 2 R 3 SiO) b (R 4 R 5 R 6 SiO) 1/2 ) c (I) wherein R 1 , R 2 , and R 3 independently represent a hydrogen atom or a C 1 to C 10 hydrocarbon group, which may be substituted with at least one halogen atom, provided that R 1 , R 2 and R 3 are not simultaneously hydrogen atoms, R 4 , R 5 and R 6 independently represent a hydrogen atom or a C 1 to C 10 hydrocarbon group, which may be substituted with at least one halogen atom, a is an integer of 1 or more, b is an integer of 1 or more, c is 2, provided that 3≦a +b +c ≦10,000, and the compound has at least one Si—H group.