Bayer Aktiengesellschaft

Artur Jaschke

Gerd Wilhelm

Rolf-Burkhard Hirsch

Surinder S Sandhu

Karl Hurm

Herbert Marzolph

Hans-Jurgen Simon

Jens Schmidt

The invention relates to a method of keeping nozzle bodies or breaker plates clean during extrusion of polymer which can be shaped from the melt which comprises preventing the formation of deposits near the nozzle orifices by gassing these orifices at the point of extrusion of the melt, said gas consisting entirely or partly of vapors of substances which have a depolymerizing action on the deposits formed from the melt at the edge of the nozzle orifice.

Method of keeping nozzle bodies or breaker plates clean during extrusion

The invention relates to a process for the recovery of acrylonitrile and other monomers from an aqueous polymer dispersion by continuous distillation in a thin-layer evaporator under reduced pressure, condensation of the evaporated monomers in a condenser under the same or similar reduced pressure and subsequent condensation or absorption respectively of the monomer vapors which have not been condensed in the condenser at a higher pressure.

Process for separating and recovering residual monomers from aqueous

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Cologne, Germany

Artur Jaschke