Makoto Mitani, Junji Saito, Sei-Ichi Ishii, Yasushi Nakayama, Haruyuki Makio, Naoto Matsukawa, Shigekazu Matsui, Jun-Ichi Mohri, Rieko Furuyama, Hiroshi Terao, Hideki Bando, Hidetsugu Tanaka, Terunori Fujita
This contribution reports the discovery and application of phenoxy-imine-based catalysts for olefin polymerization. Ligand-oriented catalyst design research has led to the discovery of remarkably active ethylene polymerization catalysts (FI Catalysts), which are based on electronically flexible phenoxy-imine chelate ligands combined with early transition metals. Upon activation with appropriate cocatalysts, FI Catalysts can exhibit unique polymerization catalysis (e.g., precise control of product molecular weights, highly isospecific and syndiospecific propylene polymerization, regio-irregular polymerization of higher alpha-olefins, highly controlled living polymerization of both ethylene and propylene at elevated temperatures, and precise control over polymer morphology) and thus provide extraordinary opportunities for the syntheses of value-added polymers with distinctive architectural characteristics...
2004: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]