The resulting mixture is then contacted with {HEAD ~ the co catalyst component} for {TAIL ~ a shorter second contact time} up to 20 seconds 
for
The resulting mixture is then contacted with { HEAD ~ the co catalyst component } for { TAIL ~ a shorter second contact time } up to 20 seconds
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH