Alpha-amino-epsilon-caprolactam-modified polyamide preparation

US4959452A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rolf-Volker Meyer · Krefeld, DE
• Rolf Dhein · Krefeld, DE
• Martin Wandel · Dormagen, DE
• Harald Selbeck · Krefeld, DE
• Friedrich Fahnler · Krefeld, DE
• Hans-Detlef Heinz · Krefeld, DE
• Peter Muller · Leverkusen, DE

Key dates

• Filing date: Apr 18, 1988
• Grant date: Sep 25, 1990
• Expiry date: Apr 18, 2008

Classification

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

Abstract

This invention relates to thermoplastically deformable branched aliphatic polyamides prepared by the hydrolytic polycondensation of lactams in the presence of small quantities of .alpha.-amino-.epsilon.-caprolactam (ACL) and approximately equivalent quantities of polycarboxylic acids (preferably dicarboxylic acids) and to a process for their preparation which is distinguished by considerably reduced polycondensation times without giving rise to cross-linked products. The process optionally in addition employs a solid phase after-condensation in which rapid further condensation takes place to the products with increased melt viscosity which are branched but are still soluble in m-cresol.