Ziegler type catalyst system

Claim 1

A catalyst composition which comprises a mixture of: (a) at least one supported Group IVB to VIII transition metal halide; (b) a trialkyl metal cocatalyst, said trialkyl metal cocatalyst having the structure of R' 3 Y wherein R' is selected from the group consisting of C 1 to C 20 primary alkyl, secondary alkyl, tertiary alkyl, neopentyl alkyl, branched alkyl, naphthenic or aralkyl groups and Y is selected from the group consisting of aluminum, gallium and indium; (c) a nitrogen-containing metal alkyl compound, the 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 is selected from the group consisting of Al, Ga and In, X is a halide and R' is a C 1 to C 20 primary alkyl, secondary alkyl, tertiary alkyl, neopentyl alkyl, branched alkyl, naphthenic or aralkyl group and R is selected from the group consisting of C 3 to C 20 bulky alkyl, cycloalkyl, aryl, 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 about 0.5 to about 200 of said compound to said transition metal compound, and (d) at least one Lewis base said Lewis base not causing excessive cleavage of metal-carbon bonds or loss of active sites.