Production of silica colloids
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United States of America Patent
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Nov 19, 1991
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N/A
app pub date -
Aug 5, 1987
filing date -
Jul 11, 1984
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Abstract
Silica colloids having a spherical form, a mean diameter of between about 10 and 100 nm and a polydispersity index between about 1 and 4. A process for making silica colloids is also provided comprising a) forming a reaction medium by simultaneously adding an acidifying agent and an alkaline silicate solution to a reaction vessel, b) reacting the acidifying agent and alkaline silicate solution, and c) maintaining a constant volume of the reaction medium by drawing off the reaction medium.
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