Silicon dioxide dispersion
AssigneeEvonik Degussa GmbH
InventorsKai Schumacher, Monika Oswald
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Abstract
Stable, aqueous dispersion containing silicon dioxide powder having a hydroxyl group density of 2.5 to 4.7 OH/nm2, which is obtained from a silicon dioxide powder produced by a flame hydrolysis process under acid conditions. The dispersion is produced by incorporating the silicon dioxide powder into an aqueous solution by means of a dispersing device. The dispersion can be used to produce glass articles.
Claims20
An aqueous dispersion comprising a silicon dioxide powder dispersed in water, wherein the silicon dioxide powder is produced by flame hydrolysis and displays a hydroxyl group density of 2.5 to 4.7 OH/nm2, wherein the hydroxyl group density is determined by reaction of the silicon dioxide powder with lithium aluminium hydride according to the method of J. Mathias and G. Wannemacher in the Journal of Colloid and Interface Science 125 (1988).
Dependencies are inferred from the claim text.