Poly para phenyleneterephthalamide compositions, their preparation and {HEAD ~ a process} for the production of fibres from {TAIL ~ these compounds} 
Poly para phenyleneterephthalamide compositions , their preparation and { HEAD ~ a process } for the production of fibres from { TAIL ~ these compounds }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL