Patent ID: 8297832

Claim:
A process for producing a polyamide, which process comprises: directly melt polymerizing a diamine and a dicarboxylic acid in a substantial absence of solvents in a batch reaction apparatus with stirring to obtain a polyamide melt; wherein the diamine comprises 70% by mole or more of a xylylenediamine having 20% by mole or more of para-xylylenediamine, the stirring is obtained with a stirring apparatus in the batch reaction apparatus and the stirring apparatus comprises: (1) a rotating shaft connected to a driving member for stirring, (2) two or more stirring rods disposed in a substantially vertical direction which are cylinder-shaped members or plate-shaped members which move along a circumference of a circle having a center at the rotating shaft, and (3) a connecting member which connects the rotating shaft and the stirring rods; wherein distances between a center line of the rotating shaft and center lines of the two or more stirring rods are each 15% or greater of an inner diameter of the reaction apparatus; the circumference along which each rod moves is the same circle; the connecting member and the rotating shaft are located above a liquid surface of the stirring melted polyamide; and a circumferential speed of the stirring rods is 30 m/minute or greater.