The starting polymers are preferably {HEAD ~ copolymers} of ethylene and {TAIL ~ vinyl acetate} having stiffness less than about 20,000 psi 
The starting polymers are preferably { HEAD ~ copolymers } of ethylene and { TAIL ~ vinyl acetate } having stiffness less than about 20,000 psi
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH