Ziegler type catalyst system

Claim 1

An improved catalyst composition adaptable for use in an alpha-olefin polymerization which comprises a mixture of: (a) at least one Group IVB to VIII transition metal halide; (b) an alkyl metal cocatalyst, said cocatalyst being selected from the group consisting essentially of a trialkyl metal or a dialkyl metal halide compound and mixtures thereof, said trialkyl metal compound having the structure of R'.sub.3 Y said dialkyl metal halide compound having the structure of R'.sub.2 YX wherein R' is selected from the group consisting of C 1 to C 20 alkyl, branched alkyl, naphthenic or aralkyl groups, Y being selected from the group consisting of aluminum, gallium or indium and X being a halide group; and (c) a nitrogen-containing metal alkyl compound, a structure of said nitrogen-containing metal alkyl compound being selected from the group consisting of R'.sub.2 YNR.sub.2 or R'XYNR.sub.2 wherein Y being selected from the group consisting of Al, Ga or In, X being halide, R' being a C 1 to C 20 alkyl, branched alkyl, naphthenic or aralkyl group and R being selected from the group consisting of C 3 to C 10 bulky alkyl groups and cycloalkyl groups, with the proviso that the two R groups can be taken with N to form a pyrrolidyl or piperidyl and the alkyl substituted derivatives of pyrrolidyl and piperidyl, said compound being in a mole ratio of 0.05 to 5 moles of said compound to said transition metal halide.