Manufacture of nylon by adding liquid diamine to aqueous polyamide forming salt solution

US4251653A · kind A · utility

Assignee

• BASF SE

Inventors

• Albrecht Eckell · Bischofswerda, DE
• Paul Matthies · Heidelberg, DE
• Georg Pilz · Neustadt, DE
• Rudi-Heinz Rotzoll · Schifferstadt, DE

Key dates

• Filing date: Jun 8, 1978
• Grant date: Feb 17, 1981
• Expiry date: Jun 8, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the manufacture of nylons by heating an aqueous solution of a salt of an alkanedicarboxylic acid of 6 to 12 carbon atoms and a diamine of the formula NH.sub.2 RNH.sub.2, where R is alkylene of 6 to 12 carbon atoms or is a radical ##STR1## to a temperature at which a nylon is formed, under superatmospheric pressure and with removal of water. The solution used is an aqueous solution of from 75 to 90 percent strength by weight of a salt of a dicarboxylic acid and a diamine, which solution has been obtained by neutralizing a less concentrated salt solution, which contains an appropriate dissolved excess of the particular dicarboxylic acid, with the corresponding diamine. The nylons obtained are used for the manufacture of moldings.