Process for preparing polyamide 6 having a low dimer content

• Main Authors: ULRICH RALPH, TRIEBENECK KONRAD
• Format: Patent
• Language: English
• Published: 01.07.2004
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The present invention relates to a process for preparing polyamide 6 (PA 6) by hydrolytic polymerization of epsilon-caprolactam. In a first reaction step, a first intermediate mixture is formed by ring opening epsilon-caprolactam in the presence of water, under conditions of increased pressure and t...