HIGHLY-FILLED, AQUEOUS METAL OXIDE DISPERSION

摘要

Aqueous dispersion containing a metal oxide powder with a fine fraction and a coarse fraction, in which - the metal oxide powder is silicon dioxide, aluminium oxide, titanium dioxide, zirconium dioxide, cerium oxide or a mixed oxide of two or more of the aforementioned metal oxides, - the fine fraction is present in aggregated form and has a mean aggregate diameter in the dispersion of less than 200 nm, - the coarse fraction consists of particles with a mean diameter of 1 to 20 µm, - the ratio of fine fraction to coarse fraction is 2:98 to 30:70, and - 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: - 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/m¿3?, and - 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 moulded articles using the dispersion.