Method and apparatus for the production of polyamides

US5773555A · kind A · utility

Assignee

• Karl Fischer Industrieanlagen GmbH · DE

Inventors

• Friedrich Weger · Berlin, DE
• Rainer Hagen · Leverkusen, DE

Key dates

• Filing date: Mar 13, 1996
• Grant date: Jun 30, 1998
• Expiry date: Mar 13, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/30
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

There are proposed a method and a device for manufacturing polyamides, in which polyamide granulate manufactured by polycondensation in the molten mass is after-condensed in the solid phase, being heated. The polyamide granulate is heated in one step to a first temperature of between 70.degree. C. and 150.degree. C., and held for a predetermined period of time at this temperature, and then, in a second step, is heated to a second higher temperature, however lying beneath the melting point, and is after-condensed at this temperature, until the desired average degree of polycondensation is achieved.