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