| 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 = ma + 2 o ? 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> |
