Patent ID: 7015169

Claim:
A process for preparing catalyst systems of the Ziegler-Natta type, consisting of the following steps: A) bringing an inorganic metal oxide into contact with an organometallic compound of group 3 of the Periodic Table, B) bringing the intermediate obtained from step A) or the treated inorganic metal oxide of step A) into contact with a magnesium compound MgR 1 n X 1 2-n , where X 1 are each, independently of one another, fluorine, chlorine, bromine, iodine, hydrogen, NR X Z , OR x , SR x , SO 3 R x or OC(O)R x , R 1 and R x are each, independently of one another, a linear, branched or cyclic C 1 –C 20 -alkyl, a C 2 –C 10 -alkenyl, an alkylaryl having 1–10 carbon atoms in the alkyl part and 6–20 carbon atoms in the aryl part or a C 6 –C 18 -aryl and n is 1 or 2, and subsequently, C) bringing the intermediate obtained from step B) into contact with a halogenating reagent, D) bringing the intermediate obtained from step C) into contact with an alcohol of the formula R 2 —OH, where R 2 is a linear, branched or cyclic C 1 –C 20 -alkyl a C 2 –C 10 -alkenyl, an alkylaryl having 1–10 carbon atoms in the alkyl part and 6–20 carbon atoms in the aryl part or a C 6 –C 18 -aryl, E) bringing the intermediate obtained from step D) into contact with a tetravalent titanium compound and F) optionally, bringing the intermediate obtained from step E) into contact with a donor compound.