| abstract |
a magnesium halide, a titanium compound having at least one Ti-halogen bond, and at least two electron donor compounds, one selected from 1,3 diethers (DE) and the other selected from dicarbamates (DC). A solid catalyst component for polymerization of olefins, wherein the catalyst component is characterized by the fact that the electron donor compound is present in a molar ratio DE:DC in the range from 4.5:1 to 20:1. |