Development of ultimate post-metallocene catalyst realizing high activity, high stereoselectivity, and living polymerization

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In order to realize high active, high stereoselective, and living polymerization of α-olefin, a series of novel [OSSO]-type ligands and their Group 4 and 5 transition metal complexes were developed. As a result, dMAO-activated zirconium(IV), hafnium(IV), titanium(III) and (IV), and tantalum(V) complexes having the [OSSO]-type ligand could be catalyzed the polymerization of1-hexene to produce perfectly isotactic polymers. In the presence of dMAO as an activator, especially, a dichloro zirconium(IV) pre-catalyst incorporating with the [OSSO]-type ligand was found to promote1-hexene polymerizations giving completely isotactic polymer with excellent activity of 17,300 g・mmol^<-1>・h<1>.