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