| abstract |
A process for polymerizing an alpha -olefin comprising contacting the olefin in liquid phase at a temperature of about 120 DEG to about 320 DEG C. with a catalyst comprising a component (A) and an organometal component (B), the component (A) being produced by reacting a hydrocarbon-soluble organomagnesium component (i) of the formula M alpha Mg beta Rp1Rq2Xr1Xs2 wherein alpha , p, q, r and s each independently is 0 or a number greater than 0, beta is 1 or a number greater than 1, p+q+r+s=m alpha +2 beta , 0</=(r+s)/( alpha + beta )<2, m is the valence of M, M is a metal of the 1st to 3rd groups of the Periodic Table, R1 and R2 each independently is a hydrocarbon group having 1 to 20 carbon atoms, X1 and X2 each independently is hydrogen or an organic electronegative group containing O, N or S, with (ii) a halide of boron, silicon, germanium, tin, phosphorus, antimony, bismuth or zinc, and contacting the product of (i)+(ii) with (iii) a compound of titanium or (iii) a compound of titanium plus a compound of vanadium at a concentration of titanium plus vanadium of at most about 2 mols per liter of the inert reaction solvent, the atomic ratio of Mg/Ti or (Ti+V) in (A) being about 3 to about 500. |