| 摘要 |
<p>A catalyst useful for polymerizing olefins which comprises a solid catalyst component [A] and an organometallic component [B], the solid catalyst component [A] being obtained by reacting (1) an organometallic compound with (2) a transition metal compound selected from the group consisting of a titanium compound, a vanadium compound, a mixture of a titanium compound and a vanadium compound and a mixture of a titanium compound and a zirconium compound, in the presence of (3) a solid reaction product of (a) an organomagnesium compound of the formula M alpha MgRpXq.Dr wherein alpha , p, q and r each independently is 0 or a number greater than 0, p + q = m alpha + 2 0 </= q/( alpha +1) < 2 m is the valence of M, M is a metal of the 1st to 3rd groups of the Periodic Table, R is at least one hydrocarbon group having 1 to 20 carbon atoms, X is at least one member selected from the group consisting of a hydrogen atom and electronegative groups containing an oxygen atom, a nitrogen atom or a sulfur atom, D is an electron donative organic compound, with (b) at least one compound selected from the group consisting of halides of boron, silicon, germanium, tin, phosphorus, antimony, bismuth or zinc and hydrogen chloride; and a polymerization process employing such a catalyst.</p> |
