Catalyst for the polymerization of olefines and processes for the polymerization of olefines using the same

摘要

A catalyst for the polymerization of olefines comprises a solid catalytic component obtained by pre-polymerizing propylene in the presence of (A) a solid component containing magnesium, titanium, halogen and an electron-donating compound, (B) an organoaluminum compound, and (C) an alkylalkoxysilane represented by the formula, R1Si(OR2)(OCH3)2, wherein R1 represents a branched or cyclic alkyl group having 3 to 6 carbon atoms, and R2 represents a branched alkyl, alkenyl or alkinyl group having 3 to 6 carbon atoms; (B) an organoaluminum compound; and (D) an alkyltrialkoxysilane represented by the formula, R3Si(OR4)2(OCH3), wherein R3 represents a linear alkyl group having 3 to 6 carbon atoms, and R4 represents a branched alkyl, alkenyl or alkinyl group having 3 to 5 carbon atoms.