Catalyst and process for polymerization of alpha-olefins

Claim 1

An alpha-olefin polymerization catalyst comprising (a) at least one organoaluminum component of the formula AlR g X 3-g wherein R is an alkyl radical of 1 to about 20 carbon atoms, X is halogen, and g ranges from 1 to 3, and (b) at least one component which is the solid reaction product of components consisting essentially of (1) at least one titanium(IV) halide or alkoxyhalide, and (2) at least one hydrocarbon-soluble organomagnesium-organoaluminum complex of the formula (MgR 1 2 ) m .(AlR 2 3 ) n wherein each R 1 and R 2 is independently an alkyl radical of 1 to about 20 carbon atoms, m and n are numbers greater than 0, and m/n is at least about 1, said components (1) and (2) being reacted at a temperature ranging from about -50° to about 150° C. and in amounts such that the atomic ratio of magnesium plus aluminum in (2) to titanium in (1) ranges from about 0.5:1 to about 4:1 to form a solid reaction product followed by separation of unreacted starting materials from said solid reaction product.