| abstract |
A catalyst formed fromn (A) a solid titanium catalyst component containing magnesium, titanium, halogen and a polycarboxylic acid ester as essential ingredients and being obtained by contacting a magnesium compound, a titanium compound and a polycarboxylic acid ester, (B) an organoaluminum compound, and (C) an organosilicon compound of the general formula (1) n n SiR¹R²(OR³)₂ (1) n n n wherein R¹ and R² are each a linear alkyl group having at least 3 carbon atoms, and R³ is a hydrocarbon group, is useful in the polymerization of olefins. |