Patent ID: 8895145
Filing Date: 2014-11-25
Classification: C01P,C09C,G03G,Y10T

Abstract:
1. A method of preparing hydrophobic silica particles comprising: a) providing a hydrosiloxane agent having the following formula wherein R R R R R R Ar is unsubstituted phenyl or phenyl substituted with one or more methyl, halogen, ethyl, trifluoromethyl, pentafluoromethyl, or —CH n, m, and k are integer numbers; n≧1, m≧1, k≧0, and wherein the hydrosiloxane agent has a number average molecular weight from 282 to about 20,000; b) contacting silica particles with the hydrosiloxane agent in the presence of a solvent, the solvent, silica particles, and hydrosiloxane agent forming a reaction mixture, wherein the reaction mixture has a pH from about 2 to about 6 or from about 8 to about 12 and wherein, when R c) drying the reaction mixture to provide hydrophobic silica particles.