| abstract |
a) Mixed oxides produced by a pyrogenic route, having modified surfaces, process for their preparation and use. b) These mixed oxides contain two or more components in the series of SiO2, Al2 O3, TiO2, ZrO2, Fe2 O3, Nb2 O5, V2 OS, WO3, SnO2 and GeO2 and have been surface modified with one or more compounds chosen from the following groups: a) organosilanes b) silazanes c) cyclic polysiloxanes d) polysiloxanes or silicone oils. Their preparation processes are characterized by the application of a heat treatment on metal chlorides of the series of SiCl4, AlCl3, TiCl4, ZrCl4, FeCl3, NbCl5, VoCl3, WOCI4, WCI6, SnCl4 and GeCl4. Their use takes place mainly as a filling substance, stabilizing agent, flow aid, anti-blocking agent, thickening agent. |