Process for producing hydrophobic silica powder

Details Process for producing hydrophobic silica powder Process for producing hydrophobic silica powder

2007-03-06

2007-03-06

Green, Anthony J. (Department: 1755)

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

C106S287110, C106S287340, C106S482000, C106S490000, C427S221000, C427S443200

Reexamination Certificate

active

11477364

ABSTRACT:
A process for producing a hydrophobic silica powder, comprises the steps for hydrophobic treatment of: adding to a silica sol in mixed solvent having a silica concentration of 5 to 50 mass % obtained by mixing an aqueous silica sol containing hydrophilic colloidal silica having a specific surface area of 5.5 to 550 m2/g with a hydrophilic organic solvent in a mass ratio of 0.12 to 2.5 based on water in the aqueous silica sol, a disilazane compound of formula (1)in-line-formulae description="In-line Formulae" end="lead"?(R13Si)2NH   (1)in-line-formulae description="In-line Formulae" end="tail"?wherein each R1is C1-6alkyl group or phenyl group that is selected independently of one another, in an amount of 0.1 to 20 mmol per surface area 100 m2of the hydrophilic colloidal silica, to obtain a mixture of the silica sol in mixed solvent and the disilazane compound; and heating the mixture at a temperature of 50 to 100° C. for aging it to obtain a slurry dispersion of hydrophobic treated colloidal silica. The process provides a hydrophobic silica powder through a simple hydrophobic treatment step.

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