Development of catalysts with dioldiester as internal donor for propylene polymerization

Research on the development of phthalate-free dioldiester catalysts for propylene polymerization was reviewed. Performance and application of these catalysts with dioldiester as internal donors were included. Property of polymer produced in various polymerization processes by dioldiester catalyst was compared with that by phthalate catalyst. Effects of different substitutes in dioldiester on the performance of catalysts were discussed. Catalysts with bulky substitute of the internal donor showed high activity and high stereospecificity in the polymerization of propylene. Different hydrogen response was found in catalyst with various substitute of dioldiester. Polymer produced by dioldiester catalysts also showed high mechanical properties. The catalyst is more challenging and will be widely used in the future.