| abstract |
(57) [Abstract] [Problem] To produce polypropylene with excellent flexibility at low cost, To provide a method for efficient production. SOLUTION: A polypropylene is produced in the presence of (A) a solid catalyst component containing titanium, magnesium and halogen as essential components, (B) a polymerization catalyst containing an organoaluminum compound and (C) an organosilicon compound, A method for producing polypropylene, comprising polymerizing propylene in the presence of a polymerization catalyst containing the polypropylene, (D) a single-site catalyst, and (E) an organoaluminum compound or an ionic compound. |