Bayer Aktiengesellschaft

Karl Hurm

Rolf-Burkhard Hirsch

Gerd Wilhelm

Wolfhard Schmidt

Artur Jaschke

Herbert Marzolph

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

This invention relates to copolymers of acrylonitrile and vinylidene chloride containing at least 55 % by weight of acrylonitrile and at most 45 % by weight of vinylidene chloride of the kind used for the production of substantially non-flammable textile filaments, which copolymers are distinguished by their outstanding whiteness and high softening temperatures which enable homogeneous spinning solutions particularly suitable for spinning to be prepared. This invention also relates to a process for the production of these copolymers.

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Dormagen, Germany

Karl Hurm