| abstract |
Solid catalyst component for the (co)polymerization of olefins CH2 =CHR, wherein R is a hydrocarbon radical having 1 to 12 carbon atoms, said olefin CH2 =CHR optionally mixed with ethylene, said catalyst component Containing Ti, Mg, Zn, Cl and an electron donor compound, the solid catalyst is characterized in that more than 50% of the titanium atoms are in the +4 valence state, and the Zn content is in the range of 0.1 based on the total weight of the subsequent solid catalyst components -4%. |