{HEAD ~ A specific order} of addition involves mixture of the transition metal component and {TAIL ~ the co catalyst component} for a contact time of 5 120 seconds followed by contact with an electron donor component for no more than 30 seconds 
{ HEAD ~ A specific order } of addition involves mixture of the transition metal component and { TAIL ~ the co catalyst component } for a contact time of 5 120 seconds followed by contact with an electron donor component for no more than 30 seconds
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL 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 OTH OTH