Witco Corporation

Ralf-Jurgen Becker

Stefan Gurtzgen

Ulrich Stewen

Rolf Schrader

Rainer Rieger

Udo Weinberg

Dirk Kutschera

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 invention relates to a process for preparing alkylaluminoxanes immobilized on inert support materials from alkylaluminum compounds and water, which is characterized in that the reactants are metered with the gas stream into a fluidized-bed reactor and the reaction product is fixed on the support directly from the gas phase.

Process for preparing aluminoxane on inert support material

The invention relates to a process for the preparation of aluminoxanes by addition of water to a solution of trialkylaluminum in an inert solvent, characterized in that the water required for the reaction is metered via a mixing nozzle into a static mixer, in particular a jet loop reactor.

Process for the preparation of aluminoxanes

The invention concerns a method of preparing trialkyl-tin hydrides by a process that ensures outstanding long-term stability. Bis-[trialkyl-tin]oxides are dissolved in a solvent that mixes only to some extent, if at all, with water and converted with an aqueous solution of sodium borohydride stabilized with a base. The product is obtained by phase separation and optionally by distillation. The trialkyl-tin hydride is obtained almost quantitatively with a yield of more than 95%.

Growing community of inventors

Hamm, Germany

Ralf-Jurgen Becker