Method of preparing organically modified silica
AssigneeCabot Corporation
InventorsVinayan C. Menon, Joanne Paul, Douglas M. Smith, Kenneth C. Koehlert
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Abstract
The present invention provides a method of preparing lipophilic silica in an aqueous medium in the absence of added acids, bases, or organic solvents. In particular, the present inventive method of preparing lipophilic silica comprises (a) providing a mixture consisting essentially of (i) at least one organically modified silica precursor which is a trifunctional silane, (ii) water, and (iii) at least one tetrafunctional silane, (b) allowing the organically modified silica to form in the mixture, and (c) removing the organically modified silica from the mixture.
Claims19
A method of preparing an organically modified silica gel comprising:
- (a) providing a mixture consisting essentially of:
- (i) at least one organically modified silica precursor selected from the group consisting of trifunctional silanes of the general formula RSiX3, wherein R is independently selected from the group consisting of aliphatic hydrocarbon and fluorocarbon radicals of 6 carbon atoms or less and phenyl radicals, and each X is independently selected from the group consisting of halogen radicals and hydroxyl radicals and salts thereof,
- (ii) water, and
- (iii) at least one tetrafunctional silane selected from the group consisting of silica, sodium silicate, and silanes of the formula SiX4, wherein each X is independently selected from the group consisting of halogen radicals,
- (b) allowing an organically modified silica gel to form in said mixture, and
- (c) recovering said organically modified silica gel from said mixture.
Dependencies are inferred from the claim text.