Patent ID: 6384181
Filing Date: 2002-05-07
Classification: C08G

Abstract:
A method of producing a polyamide resin by reacting with at least one diamine compound, at least one linear polyester resin consisting of at least one dicarboxylic acid component and at least one diol component and having an intrinsic viscosity of not less than 0.2 dl/g, so that said at least one diol component of said linear polyester resin is substituted by said diamine compound, resulting in said polyamide resin as a reaction product, wherein the improvement comprises:at least one of a carboxylic acid-activator, in an amount of 0.01-0.5 mol per 1 mol of said linear polyester resin as calculated in the repeating unit thereof, and an inorganic salt, formed of metal ions selected from the group consisting of an alkaline metal ion, alkaline earth metal ion, transition metal ion and anions selected from the group consisting of chloride ions, bromide ions, and iodide ions, being present in a reaction system of said linear polyester resin and said diamine compound said linear polyester resin reacting with said diamine compound in a reaction medium comprising at least one solvent selected from aprotic solvents.