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