{HEAD ~ A process} is disclosed for producing, in situ and without milling or grinding, an alpha olefin polymerization catalyst component which comprises adding {TAIL ~ an olefin} to a titanium halide and then adding an electron donor to the mixture of the titanium halide and the olefin 
comprises adding
{ HEAD ~ A process } is disclosed for producing , in situ and without milling or grinding , an alpha olefin polymerization catalyst component which comprises adding { TAIL ~ an olefin } to a titanium halide and then adding an electron donor to the mixture of the titanium halide and the olefin
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH