Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschr&auml;nkter Haftung

Andre Laban

Herbert Schumann

Walter Kaminsky

Birgit Corinna Wassermann

Sebastian Dechert

Eike Poetsch

Andrea Eisenhardt

Manfred Arnold

Wilfried Wassermann

Stefan Schutte

Markus Hummert

Jana Knorr

Katharina Lange

Kartin Köhler

Björn Heuer

Katrin K&ouml;hler

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

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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Klein Nordende, Germany

Andre Laban