US Patent Issued to NOVA Chemicals (International) on June 24 for "Control of unsaturation in polymers produced in solution process" (Canadian, American Inventors)

ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,304, issued on June 24, was assigned to NOVA Chemicals (International) S.A. (Fribourg, Switzerland).

"Control of unsaturation in polymers produced in solution process" was invented by Qinyan Wang (Pittsburgh), Cheng Fan (Calgary, Canada) and Peter Zoricak (Calgary, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "The copolymerization of ethylene with an optional comonomer is conducted in the presence of a catalyst having a specific aryloxy ether ligand structure. The process enables very high conversions of ethylene to polyethylene at very short residence times when conducted under conditions of pressures of at least 10.3 MPa and high ethylene ...