05942590 is referenced by 9 patents and cites 2 patents.

The present invention is hydrophobic silica gels having a reduced surface area and a method for their preparation under neutral conditions. The method comprises two steps, where in the first step the pH of a mixture comprising a silica hydrosol and colloidal silica is adjusted with a base to within a range of pH 3 to pH 6 to facilitate formation of a silica hydrogel having incorporated therein colloidal silica. In the second step the silica hydrogel is contacted with an organosilicon compound in the presence of a catalytic amount of a strong acid to effect hydrophobing of the silica hydrogel to form a hydrophobic silica gel having a surface area within a range of about 100 m.sup.2 /g to 450 m.sup.2 /g in the dry state. In a preferred process the hydrophobic silica gel is contacted with a sufficient quantity of a water-immiscible organic solvent to convert the hydrophobic silica hydrogel into a hydrophobic silica organogel. A water soluble compound of cerium or iron may be added during conduct of the second step to improve heat stability of the hydrophobic silica gel.

Title
Process for making hydrophobic silica with reduced surface area under neutral conditions
Application Number
806002
Publication Number
5942590
Application Date
February 11, 1998
Publication Date
August 24, 1999
Inventor
Clifford Carlton Reese
Midland
MI, US
James Richard Hahn
Midland
MI, US
Qin Deng
Midland
MI, US
Gary Thomas Burns
Ohain
BE
Agent
Wiliam F Boley
Assignee
Dow Corning Corporation
MI, US
IPC
C08G 77/00
View Original Source