US Patent 6,228,794
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
Disclosed are novel catalysts, processes of synthesizing the catalysts and to olefin polymerization processes using the catalysts. The catalysts are cationic complexes comprising a Group 13 element and certain ligands. These compounds behave similarly to Ziegler-Natta catalysts but effectively catalyze the polymerization of olefins in the absence of any transition metal.
Jordan, Richard F.; Coles, Martyn P.; Dagorne, Samuel; and Ihara, Eiji Cationic group 13 complexes incorporating bidentate ligands as polymerization catalysts. US Patent 6,228,794 filed March 03, 1998 and issued May 08, 2001. https://ir.uiowa.edu/patents/276