Process for preparing polyamides

US6069228A · kind A · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Albert W. Alsop · Wilmington, US
• Elwood Neal Blanchard · Wilmington, US
• Jeffrey D. Cohen · Kennett Square, US
• John M. Iwasyk · Wilmington, US
• Clara Young Lin · Hockessin, US
• David Neil Marks · Wilmington, US
• Jan M. Stouffer · Washington, US

Key dates

• Filing date: Aug 17, 1998
• Grant date: May 30, 2000
• Expiry date: Aug 17, 2018

Classification

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

Abstract

Disclosed is a process for the preparation of polyamide polymers via prepolymer formation in a reactor system comprising a reactor, flasher and separator, crystallization of the prepolymer under controlled temperature conditions and the subsequent conversion of these crystallized prepolymers to high molecular weight polymer.