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