The reaction end point is achieved when {HEAD ~ no isocyanate functionality} remains in {TAIL ~ the resulting polyisocyanate derived adduct} 
remains in
The reaction end point is achieved when { HEAD ~ no isocyanate functionality } remains in { TAIL ~ the resulting polyisocyanate derived adduct }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL