BROAD MOLECULAR WEIGHT DISTRIBUTION POLYPROPYLENE RESINS

摘要

Polypropylene resin comprising at least 50 mol % propylene, an MWD (Mw/Mn) of greater than 5, a branching index (g′) of at least 0.95, and a melt strength of at least 20 cN determined using an extensional rheometer at 190° C. A catalyst system comprising a Ziegler-Natta catalyst comprising a non-aromatic internal electron donor, and first and second external electron donors comprising different organosilicon compounds, and a method to produce a polypropylene resin comprising contacting propylene monomers at propylene polymerization conditions with the catalyst system are also disclosed.