Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Degussa Aktiengesellschaft

Horst Ferch

Manfred Ettlinger

Hans B Wagner

Edgar Simon

Detlev Koth

Gerd Lumbeck

Pressed objects (slugs) of pyrogenically produced oxides such as SiO.sub.2, Al.sub.2 O.sub.3 and TiO.sub.2 are produced using a silica sol and water. As molding assistants thereby there is employed a polyhydric alcohol, e.g. glycerine or sorbitol. The water can be added adsorbed on a pyrogenically produced hydrophobized silica. The pressed object obtained can be used inter alia as catalyst carrier.

Process for the production of slugs of pyrogenically produced oxides

An aqueous dispersion of a hydrophobic silica consisting of 0.1 to 50 parts of hydrophobic silica, in a given case up to 3 parts of wetting agent and 99.9 to 50 parts of water. It is produced by intensive mixing of hydrophobic silica with water with the known 'dry-water-phase' as an intermediate step. In a given case there can additionally be used a wetting agent in which case the 'dry-water-phase' does not occur. The dispersion of hydrophobic silicas can be mixed without additional steps or materials with rubber latex.

Aqueous dispersion of a hydrophobic silica

Aqueous carbon black compositions are made containing fluorine containing wetting agents to increase the stability to weather. The carbon black compositions are useful in mineral binder systems, for example for concrete, slate, clear concrete, asbestos concrete and exterior plaster formulations.

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Bruchkobel, Germany

Horst Ferch