Continuous process for the hydrolytic production of polycaprolactam having a low-monomer and low-dimer content

US4327208A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunter Lehr · Krefeld, DE
• Uwe Hucks · Alpen, DE
• Hugo Vernaleken · Walsrode, DE
• Werner Nielinger · Krefeld, DE
• Erhard Tresper · Krefeld, DE

Key dates

• Filing date: Jul 9, 1980
• Grant date: Apr 27, 1982
• Expiry date: Jul 9, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/46
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of polyamide-6 or corresponding copolyamides by hydrolytic polymerization wherein the low molecular weight secondary reaction products and the unreacted .epsilon.-caprolactam are separated off from the polyamide melt and directly condensed on the .epsilon.-caprolactam melt to be polymerized.