Witco Corporation

The State University of New York

Rainer Rieger

Wolfram Uzick

John J Eisch

Stefan Gurtzgen

Ralf-Jurgen Becker

Dirk Kutschera

Hans-Gunter Volland

Katrin MacKenzie

Disclosed is a process for preparing a supported metallocene catalyst by introducing, in a first stage, a gas stream comprising an organoaluminum compound, an inert support material and water, into a first gas phase reactor; allowing the mixture to react under conditions effective to form an aluminoxane supported on said inert support material; metering a second gas stream comprising a metallocene into said gas phase reactor; allowing said mixture to react under conditions effective to form a supported metallocene catalyst; and drying, in a second stage, said supported metallocene catalyst, wherein said drying is carried out in a gas phase reactor. An alternative process comprises introducing, in a first stage, a gas stream comprising an organoaluminum compound, an inert support material, a metallocene and water, into a first gas phase reactor; allowing the mixture to react under conditions effective to form an aluminoxane supported with said metallocene on said inert support material; and drying, in a second stage, said supported metallocene catalyst, wherein said drying is carried out in a gas phase reactor.

Process for the preparation of metallocene catalyst systems on inert

The present invention is directed to a gas phase process of preparing a supported metallocene catalyst wherein an alkylaluminum compound, water, a metallocene and, optionally, an olefin are metered into a fluidized bed reactor containing a fluidized bed of an inert support material in the presence of a gas stream.

Fluidized bed gas phase process of preparing a supported metallocene

Disclosed are homogeneous formulations consisting essentially of one or more oxidation-sensitive organometallic compounds in a hydrocarbon, such as paraffins having a boiling point of at least 150.degree. C. and a viscosity of at least 1 Pa.s at 25.degree. C. Also disclosed is a process for the preparation of these formulations.

Stable homogeneous formulations of oxidaton- sensitive organometallic

Novel bimetallic organometallic compounds, their synthesis and application in polymerization catalyst system based on combination of such novel bimetallic organometallic compounds with transition metal complexes is provided.

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Bonn, Germany

Rainer Rieger