Union Carbide Chemicals & Plastics Technology Corporation

James W Nicoletti

Kevin Joseph Cann

Frederick John Karol

Daniel Paul Zilker, Jr

Kiu H Lee

Fathi David Hussein

Arthur E Marcinkowsky

Thomas Edward Spriggs

Xinlai Bai

Mark C Hwu

Sergey A Vasnetsov

Ethylene/propylene copolymer rubbers

A process for producing polyethylene having a broad molecular weight distribution is provided, in which ethylene and optionally a comonomer are contacted in two reactors connected in series, one reactor containing a titanium-based catalyst and the other reactor containing a vanadium-based catalyst and a halohydrocarbon promoter, or alternatively, both reactors containing a mixed metal catalyst comprising both titanium and vanadium. In the latter case, the halohydrocarbon promoter is present in only one of the reactors to activate the vanadium sites of the catalyst and deactivate the titanium sites of the catalyst simultaneously.

Ethylene polymerization using a titanium and vanadium catalyst system in

A process comprising contacting a mixture comprising ethylene, propylene, and, optionally, a diene, in the gas phase, under polymerization conditions, with a catalyst system comprising:

A vanadium-based catalyst system is treated with an ether as a means of enhancing catalyst activity and polymer productivity.

High activity vanadium-based catalyst

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Piscataway, NJ, United States of America

James W Nicoletti