A process for preparing a Polyamide polymer based on {TAIL ~ a dicarboxylic acid} and {HEAD ~ a diamine} by polycondensation in an extruder, which comprises 
A process for preparing a Polyamide polymer based on { TAIL ~ a dicarboxylic acid } and { HEAD ~ a diamine } by polycondensation in an extruder , which comprises
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH