Patent ID: 9708449
Date: 2017-07-18
CPC Classifications: C08G

Claim:
1. A process for continuously preparing aliphatic or semiaromatic polyamide oligomers, comprising a) providing an aqueous composition comprising at least one component which is suitable for polyamide formation and is selected from the group consisting of dicarboxylic acids, diamines, salts of at least one dicarboxylic acid and at least one diamine, lactams, ω-amino acids, aminocarbonitriles, and mixtures thereof, and supplying the composition provided to an oligomerization zone, b) subjecting the composition supplied in step a) to an oligomerization in the oligomerization zone without mass transfer with the environment at a temperature of 170 to 290° C. and an absolute pressure of at least 20 bar, and c) withdrawing an output comprising the polyamide oligomers from the oligomerization zone; wherein the composition provided in step a) has a water content of 20 to 55% by weight, based on the total weight of the composition.