Patent ID: 8642494

Claim:
A catalyst system comprising: a Ziegler-Natta catalyst comprising a titanium compound and at least one titanium-halogen bond; an internal donor comprising at least 80 wt % of an enamino-imine with respect to the total weight of the internal donor; a magnesium halide in active form, wherein the Ziegler-Natta catalyst and the internal donor are both supported on the magnesium halide in active form; and an organoaluminium compound; wherein the enamino-imine is of the formula: wherein R 2 and R 3 hydrogen, or a C 1 -C 20 linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group, and R 2 and R 3 can be linked together to form a cycle; and R 1 and R 4 are each independently selected from a linear or branched alkyl, alkenyl, cycloalkyl, aryl, arylalkyl or alkylaryl group.