Bayer Aktiengesellschaft

Agfa-gevaert

Lanxess Deutschland Gmbh

Torsten Groth

Winfried Joentgen

Paul Wagner

Lutz Heuer

Hans-Joachim Traenckner

Thomas Menzel

Nikolaus Muller

Josef Kasbauer

Roland Kleinstuck

Klaus-Peter Heise

Karl-Erwin Piejko

Hermann Uhr

Ulrich Liesenfelder

Bernd-Michael Konig

Gerd Schmitz

Frank Dobert

Herbert Eichenauer

Harro Traubel

Klaus Walz

Wolfgang Zarges

Hans-Georg Pirkl

Bernhard Lehmann

Thomas Roick

Eckhard Wenderoth

Dorde Jovcic

Michael Pirkotsch

Frank D&ouml;bert

Hermann Sicius

Andreas Gr&ouml;schl

Ralf-Johann Moritz

Martin Kugler

Ulrich E Muller

Gunter Helling

Bernd Alig

Rudiger Schubart

Klaus Wagner

Jurgen Reiners

Michael Schwamborn

Alfred Mitschker

Heinz-Joachim Rother

Uwe Vogt

Wolfgang Wirth

Werner Struver

Kai Butje

Thomas Klein

Dietrich Gehrmann

Ursula Pentling

Martin Riegels

Josef Pfeiffer

Ferdinand Kummeler

Ingo Janisch

Ulrich Litzinger

Hans W Linden

Thomas Bamberger

Fritz Lesszinsky

Gerd F Renner

Bruno Bomer, Deceased

Volker Hassmann

J&ouml;rgen Weinschenck

Manfred Schnee

Ute Wollborn

Tran Hai

Guido M Bomer, Heir

Manfred Giltjes

Winfreid Joentgen

Karl-Hermann Brucher

Joachim-Reinhard Wesener

Nikolaus M Uller

Richard Bathke

Gunter Wieghaus

Gert Schopwinkel

Bernd Konemund

Roland Kleinst&uuml;ck

Alexander Steinb{umlaut Over (u)}chel

Ralf Moritz

J&uuml;rgen Horn

Joergen Weinschenck

Fred Bernd Oppermann

Gunter Boehmke

The invention relates to a process for the preparation of iminodisuccinic acid ammonium metal salts, characterized in that, in a first stage, maleic anhydride (MA), alkali metal hydroxide and water are mixed in the molar ratio of 2:0&#x2013;3:5&#x2013;30 and then ammonia is metered in in the ratio MA: ammonia 2:1.5&#x2013;8, in order to obtain iminodisuccinic acid ammonium salts which, in a second stage, are reacted with metal oxides, metal hydroxides (and) or other metal salts or their mixtures to give iminodisuccinic acid ammonium metal salts of the formula 8,IDA(NH)(Na)(K)(Me).(NH)Formula 8in which

Preparation and use of iminodisuccinic acid ammonium metal salts

The present invention relates to compositions for water treatment based on biodegradable polymers containing repeating succinyl units, biocidal oxidizing agents and unsubstituted or substituted amidosulphonic acid, their use in, and the process for, conditioning water of cooling circuits.

Media for water treatment

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

A process for the preparation of iminodisuccinic acid alkali metal salts by reaction of maleic acid and ammonia in an aqueous medium in the presence of alkali metal hydroxides and working up thereof.

Preparation and use of iminodisuccinic acid salts

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 invention relates to a method for carrying out polycondensation reactions, according to which the polycondensation of a monomeric starting material is carried out with external supply of heat in a reactor combination which has at least two stages and is composed of a pre-reactor and a high-viscosity reactor, where the low-molecular-weight elimination products produced are removed by evaporation. In the pre-reactor, the reaction product is concentrated to give a high-viscosity preliminary product. The high-viscosity preliminary product is then fed to the high-viscosity reactor, in which it reacts to completion with simultaneous introduction of thermal and mechanical energy and with a residence time of from 20 s to 60 min to give a polycondensation product.

Method for carrying out polycondensation reactions

The invention relates to the production of polyaspartic acid homo- and copolymers by biotechnological processes and to the use of the resulting products (for influencing the crystallization or agglomeration behavior of sparingly soluble salts or solids in aqueous systems).

Polyasparaginic acid homopolymers an copolymers, biotechnical production and use thereof

The plasticity of ceramic compositions and dispersions can be improved by addition of at least one polymer (I) with recurring succinyl units. This effect can be reversed by addition of a setting accelerator (II); preferred setting accelerators are polymers (II) of the polyalkylenepolyamine type.

Process for improving the plasticity of ceramic composition and for

Raw native fibers and textile products therefrom can be simultaneously washed and bleached in one liquor if the liquor has added to it a combination product of

Simultaneous washing and bleaching of native fibres and textile products

Iminodisuccinic acids of the formula ##STR1## the substituents of which have the meaning given in the description, are bleaching regulators in H.sub.2 O.sub.2 bleaching of textile-forming natural plant fibers or silk, wool and their mixtures with synthetics.

Process for the pretreatment of fibers

Polymers having recurring succinyl units are obtained by an improved process by reaction of A, an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof, with B, a nitrogen-donating compound, in a first reaction step to give a reaction mixture comprising at least one low molecular weight reaction product, and subsequent continuous feeding of the reaction mixture into a continuously operated reactor to give the polymer in a second reaction step. In a further embodiment the invention refers to polymers having recurring succinyl units prepared by reaction of an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof with a nitrogen-donating compound in a first reaction step and subsequent feeding of the reaction mixture, without intermediate isolation, into an optionally continuously operated reactor, with removal of water, and treatment of the reaction mixture at a temperature of 140 to 350.degree. C.

Process for the preparation of polymers having recurring agents

The combination comprising iminodisuccinates of the formula ##STR1## in which the substituents have the meaning given in the description and polymers containing recurring succinic acid units improve the properties of detergents or cleaners.

Detergents and cleaners containing iminodisuccinates

Washing process using polycarboxylic acid salts

Use as antifreeze of polymers with recurring succinyl units

Growing community of inventors

Odenthal, Germany

Torsten Groth