Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Corinna Kissner

Monika Oswald

Roland Weiss

Andreas Lauer

Aqueous dispersion containing a metal oxide powder with a fine fraction and a coarse fraction, in which&#x2014;the metal oxide powder is silicon dioxide, aluminum oxide, titanium dioxide, zirconium dioxide, cerium oxide or a mixed oxide of two or more of the aforementioned metal oxides,&#x2014;the fine fraction is present in aggregated form and has a mean aggregate diameter in the dispersion of less than 200 nm,&#x2014;the coarse fraction consists of particles with a mean diameter of 1 to 20 &#x3bc;m, &#x2014;the ratio of fine fraction to coarse fraction is 2:98 to 30:70, and&#x2014;the content of metal oxide powder is 50 to 85 wt. %, referred to the total amount of the dispersion. The aqueous dispersion is produced by a process comprising the steps:&#x2014;production of a fine fraction dispersion by dispersing the pulverulent fine fraction in water by means of an energy input of at least 200 KJ/m3?, and&#x2014;introducing the coarse fraction in the form of a powder into the fine fraction dispersion under dispersing conditions at a low energy input. Process for the production of molded articles using the dispersion.

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Hanau, Germany

Corinna Kissner