Continuous preparation of linear high molecular weight polyamides having regulated amino and carboxyl end group content

US5140098A · kind A · utility

Assignee

• BASF SE

Inventors

• Gunter Pipper · Bad Dürkheim, DE
• Peter Hildenbrand · Karlsruhe, DE
• Wolfgang Mueller · Wappingers Falls, US

Key dates

• Filing date: Jul 10, 1991
• Grant date: Aug 18, 1992
• Expiry date: Jul 10, 2011

Classification

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

Abstract

Linear high molecular weight polyamides containing a regulated level of amino and carboxyl end groups are prepared in a continuous process by reacting polyamides in the melt with polyamide-forming diamines or dicarboxylic acids by continuous mixing for a residence time of .ltoreq.10 minutes, granulating the polyamide, and further condensing the polyamide granules thus obtained in solid phase in the presence of inert gases until the viscosity has reached the desired level.