Union Carbide Chemicals & Plastics Technology Corporation

Purna Chand Sishta

Frederick John Karol

Gregory T Whiteker

Timothy Todd Wenzel

David James Schreck

Clark Curtis Williams

Thomas Henry Peterson

John Henry Oskam

Eric P Wasserman

Xinmin Yang

Process for the preparation of polyethylene or polypropylene

The invention relates to a process for the polymerization of olifins in the presence of an activated catalyst composition comprising a single site catalyst precursor and an activating cocatalyst, which comprises contacting outside of a polymerization reactor a single site catalyst precursor with an activating cocatalyst before, during, or after contacting the single site catalyst precursor with a weakly coordinating electron donor that does not substantially polymerize during either contacting.

Olefin polymerization catalyst composition having increased activity

A method for preparing an activated catalyst composition comprising a single site catalyst precursor and an activating cocatalyst, which comprises contacting outside of a polymerization reactor a single site catalyst precursor with an activating cocatalyst before, during, or after contacting the single site catalyst precursor with a weakly coordinating electron donor such as 1-hexene.

Polyethylene having a broad molecular weight distribution, a narrow comonomer distribution and excellent processability is easily and cost effectively made using stereoisomeric mixtures of bridged metallocene catalysts containing cycloalkadienyl ligands with facial chirality.

Production of polyethylene using stereoisomeric metallocenes

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Whitehouse, NJ, United States of America

Purna Chand Sishta