Bayer Aktiengesellschaft

Frank Weyrich

Klemens Kohlgr&uuml;ber

Klemens Kohlgrüber

Alfred Eitel

Hans-Jürgen Thiem

Heinrich Morhenn

Helmut Meyer

Konrad Triebeneck

Dieter G&ouml;bbels

Ricarda Nothelle

Cliff Scherer

Michael König

Peter Rudolph

Rubber-free copolymers of unsaturated monomers selected from the group comprising styrenes and vinyl cyanides are disclosed. The copolymers that contain 65 to 80 wt. %, of styrene and 20 to 35 wt. % of acrylonitrile are characterized in their low content of residual monomers and improved physical properties. Also disclosed are a process and a device for the preparation of these copolymers.

Copolymers, devoid of rubber, with low residual monomer content and a method and device for producing the same

Apparatus for carrying out mass transfer processes with high-viscosity liquids comprising a vertically arranged vessel ( ) having a feeder ( ) for the liquid to be treated, an outlet ( ) for volatile components and an outlet ( ) for the treated liquid, the feeder means ( ) being equipped with a distributor element ( ) having a multiplicity of orifices ( ) for subdividing the high-viscosity liquid to be treated into a multiplicity of individual streams, wherein essentially vertically arranged wire loops ( ) are disposed in the vicinity of the orifices ( ), along which wire loops the high-viscosity liquid runs off under the action of gravity.

Apparatus for carrying out mass transfer processes

A process for producing a polyamide or copolyamide freed from volatile constituents by removing the volatile constituents, in particular the monomers and dimers, in at least two stages from the polymer melt by using an, in particular, gaseous entrainer is described. The invention also relates to polyamide compositions made of polyamide 6 or a copolyamide with a reduced volatile constituent content, as well as moulding compositions made of the above-mentioned polyamides, and moulded articles and fibers which are produced from these moulding compositions.

Polyamide composition and method for producing the same

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Haan, Germany

Frank Weyrich