Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Michael Happ

Werner Obrecht

Rudiger Musch

Wolfgang Zarges

Hans-Josef Buysch

Wolfgang Podszun

Hugo Vernaleken

Reinhold M Klipper

Rudiger Schubart

Heinrich Schrage

Peter Wendling

Eberhard Muller

Ulrich Schnegg

Manfred Abele

Hans-Karl Soest

Dieter Irmscher

Ralf-J&uuml;rgen Born

Rudiger Seidel

The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature Tof from 70 to 120&#xb0; C. and, once a degree of saponification of at least 65% has been reached, is completed at a temperature Tof from 120 to 180&#xb0; C.

Process for the alkaline saponification of crosslinked acrylonitrile bead polymers

The present invention relates to a process for preparing crosslinked ion exchangers with a homogeneous network structure based on unsaturated aliphatic nitriles in the presence of film-forming protective colloids.

Process for preparing crosslinked ion exchangers based on unsaturated aliphatic nitriles

The polymer compounds according to the invention, comprising special amidines, mercapto compounds and elastomers, are mainly suitable for the production of thermally stable, halogen-containing vulcanized rubbers. The vulcanized, halogen-containing rubbers obtained by means of the polymer compounds are distinguished by a reduced tendency to undergo unwanted subsequent vulcanization and are stable towards thermal and oxidative degradation at high storage temperatures.

Polymer compounds and their use for the vulcanisation of

Vulcanizable, mercaptan- and/or xanthogen-disulfide-regulated polychloroprene rubber are produced by emulsion polymerization of chloroprene and, based on polymerizable monomer used, 0 to 30 parts by weight ethylenically unsaturated, other monomers copolymerizable with chloroprene in an alkaline medium by a process in which

Process for the production of vulcanizable mercaptan-and/or xanthogen

Secondary products formed in the chlorination of butadiene can be reacted with phenols in the absence of iron catalysts to form novolak-like phenolic resins in such a way that the tetrachlorobutane present in the secondary products does not react. It can be distilled off with the excess phenol and isolated in pure form from the distillate obtained.

Process for the isolation of tetrachlorobutane and for the production of

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Dormagen, Germany

Michael Happ