Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Bayer Corporation

Wolfgang Zarges

Reinhold M Klipper

Wolfgang Podszun

Olaf Halle

Pierre Vanhoorne

Winfried Joentgen

Torsten Groth

Michael Schelhaas

Rolf Brockmann

Michael Happ

Edzard Tholema

Detlef Szeymies

Andreas Gr&ouml;schl

Erwin Bacher

Harro Traubel

Klaus Kunde

Karlheinz Hildenbrand

Horst Brandt

Peter R Nyssen

Bernhard Lehmann

Ulrich Schnegg

Bruno Hees

Georg Martin

Thomas Roick

Rudolf Wagner

Stefan Neumann

Michael Pies

Hans-Karl Soest

Ingo Janisch

Dietrich Tegtmeyer

Wolfgang Frank

Hans-Jurgen Wedemeyer

Wolfgang Wambach

Volker Hassmann

Hubertus Mittag

Helmut Hoffmann

Uwe Boeger

Dieter Irmscher

Hans Peter Geiger

John C DuBose

Andrew D Johnson

Samuel Shaun Murphree

Bettina Burkhardt

Ralf Friedricsen

Rudiger Seidel

Ralf-J&uuml;rgen Born

Guido Issling

Markus Koschorreck

Stefan Hilger

J&uuml;rgen Horn

Achim Brand

Uwe Böger

Hans-Jürgen Wedemeyer

The invention relates to a method of producing monodisperse amidomethylated vinylaromatic bead polymers, to ion exchangers prepared from these monodisperse amidomethylated vinylaromatic bead polymers by alkaline hydrolysis, to the method of using said monodisperse amidomethylated vinylaromatic bead polymers in the manufacture of ion exchangers and chelating resins, and also to the method of using these ion exchangers in the removal of heavy metals and noble metals from aqueous solutions or gases.

Method for producing monodisperse, amido-methylated vinyl-aromatic bead polymers

The invention relates to a process to produce phthalimides by heating diammonium phthalate in the presence of aromatic solvents and to a process to produce phthalimides by heating diammonium phthalate in the presence of aromatic solvents for their recycled use during the ion exchanger production process. The diammonium phthalate is prepared by making use of the phthalic add salts solution resulted from the on exchanger production process.

Process for the production of phthalimides

The invention relates to a process for producing non-agglomerating mixed bed ion exchangers or mixed bed components.

Non-agglomerating mixed bed ion exchangers

The present invention relates to a method of producing novel monodisperse chelate resins based on crosslinked polymer beads containing aminomethyl groups and/or aminomethyl nitrogen heterocyclic groups that have a high uptake capacity for heavy metals and rapid kinetics.

Method of producing monodisperse chelate resins

The present invention relates to novel ion exchangers comprising carboxyl groups and also &#x2014;(CH)NRRgroups having improved exchange kinetics and selectivity, a method for their production and also use thereof for the adsorption of metals, in particular arsenic, when these are additionally loaded with iron oxide/iron oxyhydroxide.

Chelate exchanger

The present invention relates to a process for producing weakly acidic cation exchangers of the polymethacrylic acid type by alkaline saponification of a crosslinked copolymer of alkyl methacrylate and methacrylic acid.

Weakly acidic cation exchangers

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 invention relates to optical brighteners that possess at least one free SO H group and their use for whitening materials containing cellulose.

Process for preparing dyes and/or brightener formulations

Aqueous pigment preparations containing a) at least one pigment, b) at least one condensation product based on A) suphonated aromatics, B) aldehydes and/or ketones and optionally C) one or several compounds selected from the group of non sulphonated aromatics, urea and urea derivatives, and c) at least one polyether polyol with a boiling point of above 150&deg; C., at normal pressure. The inventive preparations are highly suitable for pigmenting natural or synthetic materials.

Aqueous pigment preparations

A method of cleaning surfaces made of glass, graphite, ceramics, polymeric and metallic materials, synthetic and vegetable fibres, e.g. fabrics, textiles or waste paper, in particular membrane surfaces, by detaching or dissolving organic and inorganic soilings by a simple flushing operation, where a solution of an iminocarboxylic acid, a polyamino acid, an emulsifier or a mixture thereof is used.

Surface-cleaning method

The invention relates to the use of polyaspartic acids and their mixtures with surfactants and emulsifiers for inhibiting or delaying deposit formation by sparingly soluble organic and inorganic components in the feed of a process that uses a membrane.

Inhibition and delay of deposit formation in membrane processes

The new disazo dyestuffs of the formula (I) ##STR1## wherein the substituents and the indices have the meanings given in the description, wherein more than 25 equivalent % of all the M cations in the molecule are alcohol ammonium radicals of the formula .sup..sym. NR.sub.1 R.sub.2 R.sub.3 R.sub.4 wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently of one another represent hydrogen, C.sub.1 -C.sub.4 -alkyl and C.sub.2 -C.sub.4 -hydroxyalkyl, with the proviso that at least one of the radicals R.sub.1 -R.sub.4 denotes C.sub.2 -C.sub.4 -hydroxyalkyl, are excellently suitable for dyeing cellulose-containing materials, and in particular paper, and are distinguished by high degrees of fastness.

Disazo dyestuffs

The present invention relates to a process for desalting aqueous suspensions containing an organic diazonium compound and electrolytes containing Na ions, in which the aqueous suspension is passed through a semipermeable membrane.

Process for the production of diazonium compounds with a low content of

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Cologne, Germany

Wolfgang Zarges