Process for the production of silica with an aerogel type structure
AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorsFelix Schmidt, Kurt Spitznagel, Adolf Wagner
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Abstract
Aerogel like silica is prepared having: A BET surface area between 80-450 m.sup.2 /g; A bulk density between 10-60 g/l; A DBP number between 2.4-3.8; An average particle size range of 0.1-7 .mu.m; A most frequent particle size range of 1-2 .mu.m; A pH value in a 4% aqueous suspension of 6-8. The aerogel is produced by homogeneously distributing 5-50 weight % of water in air dispersed pyrogenic silica and drying the powdery mixture obtained. The products are especially useful as delustering agents.
Claims28
A process for the production of an aerogel-like structured silica comprising uniformly working 5 to 50 weight % of water into an air dispersed pyrogenic silica and drying the powdery mixture produced.
Dependencies are inferred from the claim text.