US Patent Issued to NOVA Chemicals (International) on Jan. 28 for "Ethylene-cyclic mono olefin copolymerizations" (Canadian Inventors)

ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,209,176, issued on Jan. 28, was assigned to NOVA Chemicals (International) S.A. (Fribourg, Switzerland).

"Ethylene-cyclic mono olefin copolymerizations" was invented by Qinyan Wang (Calgary, Canada), XiaoChuan Wang (Calgary, Canada), Peter Zoricak (Calgary, Canada), Steven Clemens (Calgary, Canada) and Brian Molloy (Airdrie, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperature...