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