GRAFT POLYMERS OF ETHYLENE-PROPYLENE-DIENE MONOMER POLYMERS WITH PROPYLENE, MEANS OF PREPARATION, AND USE IN POLYPROPYLENE COMPOSITIONS

摘要

Graft polymer comprising an ethylene-propylene-diene monomer polymer having polypropylene grafted thereto at one or more of the diene monomer sites, the process for making the graft polymer comprising the sequential use of two different Ziegler-Natta catalyst systems, the use of the graft polymer for improving the impact properties of polypropylene compositions, and improved polypropylene blends.