During the polymerization of the monomers required to form the polyethylene terephthalate, a quantity of polyethylene glycol is copolymerized therewith to form {HEAD ~ a polymer} which exhibits {TAIL ~ a substantial intrinsic viscosity}  
During the polymerization of the monomers required to form the polyethylene terephthalate , a quantity of polyethylene glycol is copolymerized therewith to form { HEAD ~ a polymer } which exhibits { TAIL ~ a substantial intrinsic viscosity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH