Plastics which cure in {HEAD ~ a series} of steps having urethane, {TAIL ~ urea}, siloxane and acrylate groups 
Plastics which cure in { HEAD ~ a series } of steps having urethane , { TAIL ~ urea } , siloxane and acrylate groups
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH