Two stage process of preparing polyaryletherketones

US5122587A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerhard Heinz · Bad Dürkheim, DE
• Robert R. Lieder · Schifferstadt, DE

Key dates

• Filing date: Aug 11, 1989
• Grant date: Jun 16, 1992
• Expiry date: Aug 11, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/4012
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

High molecular weight polyaryletherketones are prepared by nucleophilic polycondensation of a bisphenol with a mixture of a difluoroaromatic and a dichloroaromatic by a process in which, in a first stage, the total amount of bisphenol and dichloroaromatic is added and, in a second stage, the difluoroaromatic is added. The resulting polyaryletherketones have a reduced viscosity of not less than 0.65 and contain from 0.003 to 0.03% by weight of organically bonded chlorine and from 0.003 to 0.03% by weight of organically bonded fluorine.