Solid catalyst component for α-olefin polymerization, catalyst for α-olefin polymerization, and process for producing α-olefin polymer

A catalyst for 60-olefin polymerization comprising:

• (A) a solid catalyst component containing a trivalent titanium compound, obtained by a process which comprises reducing a titanium compound expressed by a general formula of Ti(OR1)aX4−a (wherein R1 represents a hydrocarbon group of 1 to 20 carbon atoms;
• X represents a halogen atom;
• 0≦a≦4) with an organomagnesium compound in the presence of an organosilicon compound having an Si—O bond and an ester to obtain a solid product, successively adding a mixture of an ether and titanium tetrachloride and an organic acid halide in this sequence to the solid product for treatment, and further treating the treated solid product with a mixture of an ether and titanium tetrachloride or a mixture of an ether, titanium tetrachloride and an ester;
• (B) an organoaluminum compound;
• and
• (C) an electron-donor compound.

A process for producing a poly-α-olefin, which comprises polymerizing an α-olefin with a catalyst comprising:

• (A) a solid catalyst component for α-olefin polymerization containing a trivalent titanium compound, obtained by a process which comprises reducing a titanium compound expressed by a general formula of Ti(OR1)aX4−a (wherein R1 represents a hydrocarbon group of 1 to 20 carbon atoms;
• X represents a halogen atom;
• 0≦a≦4) with an organomagesium compound in the presence of an organosilicon compound having an Si—O bond and ester to obtain a solid product, successively adding a mixture of an ether and titanium tetrachloride and an organic acid halide in this sequence to the solid product for treatment, and further treating the treated solid product with a mixture of an ether and titanium tetrachloride or a mixture of an ether, titanium tetrachloride, and an ester;
• (B) an organoaluminum compound;
• and
• (C) an electron-donor compound.