Patent ID: 6696544
Filing Date: 2004-02-24
Classification: C08G

Abstract:
A process for the manufacture of a polyamide from at least one diacid and from at least one diamine, comprising the following stages:preparing a first mixture M2 of diacid and of diamine with a diacid/diamine molar ratio of between 1.005 and 1.2, preparing a second mixture M3 of diacid and diamine with a diacid/diamine ratio of between 0.8 and 0.995, introducing, in the molten form, a stream of the first mixture M2 and a stream of the second mixture M3 into a stirred polymerization reactor, withdrawing a stream of prepolymer from said reactor and feeding said stream to a finishing stage in order to obtain the degree of desired polymerization; and in that the mixture of the streams of the first and second mixture is continuously analyzed in order to determine the ratio of the acid functional groups to the amine functional groups, and at least the flow rate of one of said streams of first or second mixture is automatically controlled according to the result of the analysis in order to maintain a ratio of the acid functional groups to the amine functional groups between two predetermined set values.