| abstract |
A catalyst comprizing:(A) a solid catalyst component containing a tri-valent titanium compound, which is obtained by reducing a titanium compound represented by the general formula Ti(OR<sup>1</sup>)<sub>n</sub>X<sub>4-n</sub> (wherein R' is a hydrocarbon group having 1 to 20 carbon atoms, X is a halogen atom and n is a number satisfying 0<n≦4) with an organo magnesium compound in the presence of an organo silicon compound having Si-0 bonds and then treating the resulting solid product with an ester compound and a mixture of an ether compound and titanium tetrachloride,(B) an organo aluminum compound, and(C) a silicon compound having Si-OR<sup>2</sup> bonds (wherein R<sup>2</sup> is a hydrocarbon group having 1 to 20 carbon atoms) and/or an organic carboxylic acid ester,and a process for producing a-olefin polymers using the same. |