| abstract |
A process for the preparation of Ziegler-Natta type catalyst systems, containing, as active constituents a) a titanium-containing solid component, which contains in addition to a compound of titanium at least one electron donor compound, and is present in an inert solvent in the form of a suspension, and, as co-catalyst, b) an aluminum compound and c) optionally further electron donor compounds in which, following the preparation of the titanium-containing solid component a), the inert solvent present in the suspension is removed by first filtering the suspension in a first step, and then removing further solvent from the filtered material in a second step by applying a pressure difference at temperatures of not more than 100 DEG C. |