Basf Aktiengesellschaft

Basell Polyolefine Gmbh

Johannes Hack

Shahram Mihan

Dieter Lilge

Martin Schneider

Paulus De Lange

Markus Enders

Ursula Rief

Udo Handrich

Gunter Ludwig

Ralph Rudolph

G&uuml;nther Schweier

Günther Schweier

Philipp Rosendorfer

Arim Lange

Substituted monocyclopentadienyl, monoindenyl, monofluorenyl or heterocyclopentadienyl complexes of chromium, molybdenum or tungsten, wherein at least one of the substituents of the cyclopentadienyl ring carries a rigid donor function which is not exclusively bonded through sp-hybridized carbon or silicon atoms, and a process for polymerizing olefins.

Monocyclopentadienyl complexes of chromium, molybdenum or tungsten with a donor bridge

Substituted monocyclopentadienyl, monoindenyl, monofluorenyl and heterocyclopentadienyl complexes of chromium, molybdenum or tungsten in which at least one of the substituents on the cyclopentadienyl ring carries a donor function which is bonded rigidly, not exclusively via sp-hybridized carbon or silicon atoms, and a process for the polymerization of olefins.

Monocyclopentadienyl complexes of chromium, molybdenum or tungsten

Substituted monocyclopentadienyl, monoindenyl, monofluorenyl and heterocyclopentadienyl complexes of chromium, molybdenum or tungsten in which at least one of the substituents on the cyclopentadienyl ring carries a donor function which is bonded rigidly, not exclusively via sp -hybridized carbon or silicon atoms, and a process for the polymerization of olefins.

&agr;-Olefins are polymerized in the gas phase at from 30 to 150&deg; C. and a pressure of from 5 to 80 bar using a catalyst or a catalyst mixture containing as antistatic agent from 0.1 to 5% by weight of ZnO and/or anhydrous MgO, based on the total amount of the catalyst mixture, except for a process in which the catalyst mixture comprises a chromium catalyst and MgO-supported Ziegler catalyst which is modified with an alkene and with alkylaluminum hydride and also comprises free MgO and the total amount of the MgO is not less than 2% by weight of the catalyst mixture.

Method for polymerizing &agr;-olefins in a gaseous phase

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Grünstadt, Germany

Johannes Hack