{HEAD ~ A polymer} based on a dicarboxylic acid and a diamine is prepared by polycondensation in {TAIL ~ an extruder}, by 
is prepared in
{ HEAD ~ A polymer } based on a dicarboxylic acid and a diamine is prepared by polycondensation in { TAIL ~ an extruder } , by
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH