US Patent 5,973,088
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
Non-transition metal containing Ziegler-Natta like catalysts are prepared and used for polymerization reactions. The catalysts are cationic aluminum amidinate compounds. The compounds successfully catalyze polymerization of unsaturated hydrocarbons such as alpha olefins and avoid the expense of transition metals and, as well, the environmental objections to the use of the same.
Jordan, Richard F. and Coles, Martyn P. Cationic aluminum alkyl complexes incorporating amidinate ligands as polymerization catalysts. US Patent 5,973,088 filed April 03, 1998 and issued October 26, 1999. https://ir.uiowa.edu/patents/226