Production of polyamides by polycondensation

US9534083B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Achim Stammer · Freinsheim, DE
• Faissal-Ali El-Toufaili · Ludwigshafen, DE
• Simon Gramlich · Ludwigshafen am Rhein, DE
• Angela Ulzhöfer · Ludwigshafen, DE

Key dates

• Filing date: Sep 3, 2013
• Grant date: Jan 3, 2017
• Expiry date: Aug 29, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L77/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for producing polyamides by polycondensation of polycondensable polyamide-forming monomers and/or oligomers in reaction mixtures comprising same, which may be water-containing but are free from organic solvents, the polycondensation is effected in an agitated reactor under agitation in a first step in the liquid phase and after a phase change taking place during the process in the same reactor is effected in a subsequent second step in the solid state, wherein the temperature in the reactor is below the melting point of the polyamide in the second step at least.