Basf Aktiengesellschaft

Robert R Lieder

Gerhard Heinz

Juergen Koch

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.

Two stage process of preparing polyaryletherketones

Polyaryl ethers which are stable at high temperatures essentially consist of

Polyaryl ethers which are stable at high temperatures and have improved

Polyaryl ether ketones essentially consist of

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Limburgerhof, Germany

Robert R Lieder