New Types Of Titanium Catalysts For Polymerization Of Alkenes

In order to develop new types of catalysts, we have synthesized a series of internal electron donors based on sulfonyl amine framework. These sulfonyl amines were used as internal electron donors for the preparation of Ziegler-Natta catalysts. We found that some of these catalysts are highly active and stereospecific for the polymerization of propylene. The activity of these catalysts is dramatically influenced by the electronic capability of the substituents. Among these internal electron donors, one of which has been successfully used for industry applications. The catalyst with this internal electron donor exhibitted a high activity and a high stereospecificity, and had a good compatibility with the existing reaction apparatus.Over the past decade the most extensively studied biocompatible and biodegradeable polyesters have been those derived from s-caprolactone and lactide. We have prepared several titanium complexes with sulfonamide-imine ligands and used for the ring-opening polymerization of LA and CL under bulk and solution polymerization conditions. These titanium catalysts showed a high catalytic activity to LA and CL, and allowed the well-controlled polymerizations of LA.