{TAIL ~ A process} 10 wherein said {HEAD ~ diisocyanate} is tolylene 2,4 diisocyanate or hexamethylene diisocyanate 
{ TAIL ~ A process } 10 wherein said { HEAD ~ diisocyanate } is tolylene 2,4 diisocyanate or hexamethylene diisocyanate
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH