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Merck Patent Gesellschaft

Merck Patent Gesellschaft MIT Beschr&auml;nkter Haftung

Birgit Corinna Wassermann

Walter Kaminsky

Herbert Schumann

Eike Poetsch

Andrea Eisenhardt

Manfred Arnold

Stefan Schutte

Sebastian Dechert

Markus Hummert

Andre Laban

Wilfried Wassermann

Katrin Koehler

Jana Knorr

Katrin K&ouml;hler

Katharina Lange

Kartin Köhler

Björn Heuer

Jens Eichhorn

Sebastiain Dechert

The invention relates to the use of nitrogenous aluminium organyl complexes of general formula (I) as co-catalysts in heterogeneous polymerisation reactions of propene. In said formula: R, R', Rand R&#x2032; independently of one another represent branched or unbranched C-Calkyl, cycloalkyl, alkenyl, cycloalkenyl, aryl or alkynyl; Rrepresents unsubstituted, monoalkylated or polyalkylated and/or monofluorinated or polyfluorinated aromatic hydrocarbons from group (II); Rand Rindependently of one another represent CH, CFoder C(R); m stands for 0, 1 or 2; n stands for 0, 1 or 2; o stands for 0 or 1, all independently of one another. Said systems exhibit improved characteristics in terms of activity and stereoselectivity in comparison to conventional co-catalysts such as AlEtand can act simultaneously as co-catalysts and stereoselectivity promoters 

Catalyst systems for Ziegler-Natta propene polymerisation

Disclosed are compounds of formula (I) which compounds are useful as cocatalysts in olefinic polymerisation reactions, e.g., as Ziegler-Natta catalysts.

Oxygen-containing organoaluminium complexes as cocatalysts

Described are catalyst systems having aluminium alkyl complexes of the formula (I) described herein applied to magnesium chloride, SiO or SiO in combination with MgCl as support in the presence of titanium halides or vanadium halides and internal and, if desired, external donors act both as cocatalysts and as stereoselectivity promoters in heterogeneous polymerizations of &agr;-olefins. Also described are polymerization methods using these catalyst systems.

Catalyst system for the Ziegler-Natta polymerization of olefins

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Berlin, Germany

Birgit Corinna Wassermann