Since the oxyalkylene groups as noted above, as well as the phenol group are reactive, {HEAD ~ the reaction} with a certain amount of isocyanate produces {TAIL ~ the desired urethane moieties thereon} 
Since the oxyalkylene groups as noted above , as well as the phenol group are reactive , { HEAD ~ the reaction } with a certain amount of isocyanate produces { TAIL ~ the desired urethane moieties thereon }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL