| abstract |
A solid catalyst component containing a trivalent titanium compound, which is obtained by reducing a titanium compound represented by the general formula Ti(OR 1 ) n X 4-n (wherein R 1 is a hydrocarbon group of 1 to 20 carbon atoms; X is a halogen atom; and n is a number satisfying 0<n≦4) with an organomagnesium compound in the presence of an organosilicon compound having at least one Si-O bond and a silica gel having a pore volume of, at a pore radius of 75 to 20,000 A, at least 0.65 ml/g to obtain a solid product, treating the solid product with an ester compound, and treating the ester-treated solid with a mixture of an ether compound and titanium tetrachloride; a catalyst system comprising:n (A) said solid catalyst component, (B) an organoaluminum compound, and (C) a silicon compound having at leat one Si-OR 2 bond (wherein R 2 is a hydrocarbon group having 1 to 20 carbon atoms) nfor alpha-olefin polymerization; and a process for producing an alpha-olefin polymer, which comprises homopolymerizing an alpha-olefin or copolymerizing alpha-olefins using said catalyst system. |