Process for producing highly stereospecific alpha-olefin polymers.

摘要

A process for producing a highly stereospecific alpha -olefin polymer which comprises homopolymerizing or copolymerizing an alpha -olefin or copolymerizing an alpha -olefin with ethylene by the use of a catalyst system comprising: (A) a solid catalyst component containing a trivalent titanium compound obtained by reducing a titanium compound represented by the following general formula: Ti(OR<1>)nx4-n (R<1> represents a hydrocarbon group having 1 to 20 carbon atoms, X represents a halogen atom and n represents a number satisfying 0 < n </= 4) with an organomagnesium compound in the presence of an organic silicon compound having Si-O bonds to obtain a solid product, followed by treating the solid product with an ester compound and thereafter treating the ester-treated solid product with a mixture of an ether compound and titanium tetrachloride or a mixture of an ether compound, titanium tetrachloride and an ester compound, (B) an organoaluminum compound, and (C) a silicon compound represented by the following general formula: R<2>R<3>Si(OR<4>)2 (R<2> represents an alicyclic hydrocarbon group having 5 to 20 carbon atoms, R<3> represents an acyclic hydrocarbon group having 2 to 12 carbon atoms, and R<4> represents a hydrocarbon group having 1 to 20 carbon atoms). o