PRODUCTION OF POLYPROPYLENE

摘要

PROBLEM TO BE SOLVED: To provide a process for producing a polypropylene having excellent flexibility in high efficiency at a low cost. SOLUTION: Polypropylene is produced in the presence of a polymerization catalyst containing (A) a solid catalyst component containing titanium, magnesium and a halogen as essential components, (B) an organic aluminum compound and (C) an organic silicon compound and propylene is polymerized in the presence of the obtained polypropylene and a polymerization catalyst containing (D) a single site catalyst and (E) an organic aluminum compound or an ionic compound.