Preparation of hydrophobic silicon dioxide

Details Preparation of hydrophobic silicon dioxide Preparation of hydrophobic silicon dioxide

C - Chemistry, Metallurgy

08

K

117/213, 117/47.

C08K 9/06 (2006.01) C09C 1/30 (2006.01)

Patent

CA 1110933

ABSTRACT OF THE DISCLOSURE A process is provided for preparing hydrophobic silicon dioxide. The process includes treating silicon dioxide having a surface area of at least 50 m2/g with an organosilicon compound containing from 2 to 4 silicon atoms per molecule, in which at least 2 hydrocarbon radicals are bonded to each silicon in atom, and in which any silicon valences which are not satisfied by hydrocarbon radicals are satisfied by siloxane oxygen atoms, and at least one tin compound containing Sn-bonded halogen and/or organic radicals. The in- herent dangers of corrosion caused by the use of an acid is avoided by the process of this invention, to provide a silicon dioxide exhibiting a higher degree of hydrophobicity that that produced by prior art processes. These products may be used as fillers for thermoplasties, as opacifiers in varnishes, as components for fire control, and for thermal insulation.

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