Patent ID: 8765902

Claim:
A process for preparing a polyamide based on dicarboxylic acids and diamines in an extruder, which comprises heating a solid monomer mixture, wherein the water content is 10-20% by weight, of the monomer mixture, composed of 50 mol % of dicarboxylic acid mixture composed of from 60 to 88% by weight of terephthalic acid and from 12 to 40% by weight of isophthalic acid, in which up to 20% by weight of the dicarboxylic acid mixture may also be replaced by other dicarboxylic acids, and 50 mol % of hexamethylenediamine which may be up to 20% by weight replaced by other C 2-30 -diamines, in a corotatory twin-screw extruder for a residence time of from 10 seconds to 30 minutes, to a temperature in the range from 150 to 400° C. while removing steam and optionally diamines through venting orifices.