Basf Aktiengesellschaft

Peter Hildenbrand

Gunter Pipper

Graham E McKee

Gerd Blinne

Claus Cordes

Dietrich Lausberg

Walter Goetz

Karl Schlichting

Wolfgang F Mueller

Alfons Ludwig

Andreas Kleinke

Hans-Georg Braun

Josef G Floss

Reinhard Lang

James Hurley

Juergen Vietmeier

Guenter Mattern

A process for continuous extraction of polyamide particles in an essentially vertical extraction column using an aqueous extractant comprises using an extraction column that is divided into two zones and performing an extraction with a recirculating 15-40% strength by weight aqueous &egr;-caprolactam solution in the first zone and then with countercurrent water at a from 5 to 40&deg; C. lower temperature in the second zone. The process provides for economical extraction of polyamides with a low level of monomers and oligomers.

Continuous polyamide extraction process

Continuous production of low molecular weight polyamides

In a process for producing filler-containing thermoplastic molding compositions by mixing fillers with thermoplastics in the melt,

Production of filler-containing thermoplastic molding compositions and

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.

Continuous preparation of linear high molecular weight polyamides having

Thermoplastic polyester molding materials essentially contain

Thermoplastic polyester molding materials having low temperature impact

Growing community of inventors

Karlsruhe, Germany

Peter Hildenbrand