| abstract |
Disclosed is a novel olefin polymerization catalyst system comprising the following components (A), (B) and (C):n (A) a transition metal compound represented by the formula R 0 x R 1 a R 2 b R 3 c R 4 d M, wherein M represents a transition metal selected from zirconium, titanium and hafnium; R 1 represents a multidentate ligand or a monodentate ligand; each of R 2 , R 3 and R 4 independently represents a ligand selected from a multidentate ligand, a monodentate ligand, a halogen atom, a hydrogen atom, an alkyl group and a derivative thereof, and an aryl group and a derivative thereof; a is an integer of 1 or more and each of b, c and d is an integer of from 0 to 3, with the proviso that a+b+c+d=4 ; R 0 is a divalent group which bridges R 1 with a ligand selected from R 2 , R 3 and R 4 ; and x is 0 or 1; (B) an inorganic solid component comprising a particulate inorganic solid having hydroxyl groups on the surface thereof and, carried thereon, an organoaluminumoxy compound having alkyl groups; and (C) an organoaluminum compound. Also disclosed is a method for polymerizing an olefin in the presence of this catalyst system. By using the catalyst system of the present invention which has high polymerization activity, olefin polymers having not only excellent powder characteristics but also excellent various properties can be effectively and efficiently produced even without conducting a preliminary polymerization. Hence, the commerical value of the present invention is extremely high. |