Process for the continuous preparation of an aliphatic or partially aromatic polyamide

US9994678B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Christian Schmidt · Bonn, DE
• Joachim Clauss · Scheinfeld, DE
• Axel Wilms · Bad Dürkheim, DE
• Volker Rauschenberger · Eisenberg, DE
• Gad Kory · Gaiberg, DE
• Stefan Schwiegk · Hamburg, DE
• Arnold Schneller · Mainz, DE
• Achim Stammer · Freinsheim, DE
• Frank Niedermaier · Ladenburg, DE
• Bernd Hackel · Mutterstadt, DE

Key dates

• Filing date: Jun 11, 2014
• Grant date: Jun 12, 2018
• Expiry date: Jun 11, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/265
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of an aliphatic or partially aromatic polyamide, in which an aqueous composition of the monomers is subjected to an oligomerization at elevated temperature and increased pressure, the reaction mixture is optionally subjected to a first decompression to reduce the water content, the (optionally decompressed) reaction mixture is heated within a short time to a temperature above the melting temperature of the polyamides and the heated reaction mixture is subjected to a (further) decompression to reduce the water content and to an after-polymerization.