Cassella Aktiengesellschaft

Hoechst Aktiengesellschaft

Basf Aktiengesellschaft

Dresser Industries, Inc.

Cassella Farbwerke Mainkur Aktiengesellschaft

Basf Se Corporation

Tougas Oilfield Solutions Gmbh

Allessa Chemie Gmbh

Friedrich Engelhardt

Ulrich Riegel

Karl Hintermeier

Joachim Ribka

Hans-Jerg Kleiner

Walter Dursch

Juliane Balzer

Gerlinde Ebert

Norbert Herfert

Klaus Kuhlein

Martin Hille

Steffen Piesch

Jeffery C Dawson

Alwin K Reng

Jochen M Quack

Joachim Gersdorf

Heinz Wittkus

Matthias Weismantel

Rolf Kleber

Karl-Heinz Keil

Mariola Wanior

Manfred Mayer

Gerhard Weckler

Helmut Beutler

Hermann Schmitz

Christian Bremer

Anja Obermüller

Joachim Christian

Wolfram Schidlo

Walter Gulden

Jorg Hax

Sigmar Von Halasz

Anthony R Reed

Rüdiger Funk

Thomas Daniel

Michael A Mitchell

Thomas Martini

Wilfried Heide

Reinhold Keller

Walter Herwig

Peter Klein

Dieter Wullbrandt

Reinhard Donges

Werner Interthal

Volker Frenz

Walter Rupp

Jurgen Grosse

Werner Gohla

Wilhelm Adam

Manfred Schrod

Klaus Sternberger

Uwe Stuven

Ulrich Greiner

Manfred Ziegelmayer

Ulrich Karsunky

Josef Hilbig

Ulrich Kussmaul

Herbert Wille

R&uuml;diger Funk

Jurgen Kuhlwein

Werner Skrypzak

Werner Spielmann

Hanss-Jerg Kleiner

Herbert Friedrich

Wolf Weidemuller

Dieter Ulmschneider

Uwe St&uuml;ven

Joachim Dentler

Hans Wilski

Otto Smerz

Hans Wagener

Artur Meyer

Ullrich Riegel

Ralf Zimmermann

Hans J Hauss

Gert Brachten

Heinz Helling

Renate Konrad

Curt A Wagner

Georg W Eckhardt

Juliane Balzar

Wolfgang Friede

Kerstine Rabas

Josef Sauer

Disclosed are stabilized aqueous polymer compositions containing A) a stabilizing amount of a least a sulfur dye or containing a stabilizing amount of a sulfur dye with a compound comprising a heterocyclic system containing nitrogen and sulphur as ring heteroatoms and B) at least one polymer comprising groups which are capable of complex formation with ions. The aqueous polymer compositions are stabilized against thermal or other degradation processes of the polymer by addition of component A) to allow their use even under harsh conditions.

Stabilized aqueous polymer compositions and their use

The invention relates to hydrogels capable of absorbing aqueous fluids, which hydrogels are produced by polymerization of olefinically unsaturated carboxylic acids or their derivatives. The hydrogels are characterized in that before, during or after the polymerization reaction and before drying a silicic acid alkali salt of the general formula (I) MO&#xd7;nSiOis added to the polymerization reaction mixture. In said formula M is an alkali metal and n is a number between 0.5 and 4. The hydrogel obtained in this way is then dried at an elevated temperature. The invention also relates to a method for producing said hydrogels and to their use for absorbing aqueous fluids.

Hydrogels absorbing aqueous fluids

The aqueous polymer composition comprises a water soluble polymer having a molar weight of at least 10Daltons and comprising functional groups which may form complexes with metal ions. The aqueous polymer compositions of this invention are stabilized against thermal or other degradation processes by addition of a phenothiazine compound to allow their use even under harsh conditions.

Stabilized aqueous polymer compositions

A flexible absorbent sheet material containing an acidic water-absorbing resin, a basic water-absorbing resin, and a plasticizer, and its method of manufacture, are disclosed. The sheets contain about 60% to 100% by weight of the acidic and basic water-absorbent resin and plasticizer. The absorbent sheets have unexpected flexibility and structural integrity, while exhibiting exceptional water absorption and retention properties.

Plasticized superabsorbent polymer sheets and use thereof in hygienic articles

The present invention relates to polymer mixtures including hydrogel-forming polymers capable of absorbing aqueous fluids and prepared by polymerization of olefinically unsaturated carboxylic acids or derivatives thereof together with copolymers of C&#x2013;Colefins or styrenes with anhydrides and also their preparation, use and hygiene articles which include same.

Polymer mixtures with improved odor control

Hydrophilic hydrogels with a high swelling capacity and method for producing and using them

Mechanically stable hydrogel-forming polymers

The present invention relates to a process for modifying hydrophilic polymers by mixing with a modifier, characterized in that the pulverulent polymer and the modifier are introduced continuously into a vertical, cylindrical mixer, mixed at a power of from 1,000 to 5,000 Wh/m,of powder by means of rotating blades at a blade rate of from 100 to 300 s,at a residence time of 1-10 seconds, during which the powder is passed through zones having energy dissipation densities of 300-600 W/l of mixer volume.

Process for modifying hydrophilic polymers

The present invention relates to hydrophilic, swellable graft polymers which comprise, in a random distribution, from 0.5 to 50% by weight of radicals of the general formula I ##STR1## and radicals of the general formula II ##STR2## from 49 to 99% by weight of radicals of the general formula III ##STR3## containing an acid group, and from 0.1 to 2% by weight of radicals of a crosslinking agent which are derived from monomers containing at least two olefinically unsaturated double bonds, where the radicals R.sup.1 to R.sup.4, X and Y and n and m are where X and Y, independently of one another are COCH.sub.3, CH.sub.2 COOR.sup.2, COCH.sub.2 CH.sub.2 COOH ##STR4## n and m, independently of one another, are 2 to 300, R.sup.1 is hydrogen or methyl, R.sup.2, independently of one another, are hydrogen, methyl or ethyl, R.sup.3 is the carboxyl group, the sulphonyl group, the phosphonyl group, which is optionally esterified by means of alkanol having 1 to 4 carbon atoms, or a group of the formula ##STR5## to the preparation thereof, and to the use thereof as absorbents for water and aqueous solutions.

Hydrophilic, swellable graft polymers

The present invention relates to a hydrophilic, highly swellable hydrogel based on (co)polymerized hydrophilic monomers or based on graft (co)polymers, characterized in that it has been surface-modified by means of a mixture of

Hydrophilic, highly swellable hydrogels

The present invention relates to hydrophilic, swellable polymers which consist of radicals of the general formula I ##STR1## wherein R.sup.1 to R.sup.3 are defined as stated in the description, and of radicals of a crosslinking agent which have originated from monomers having at least two olefinically unsaturated double bonds, and which are characterized in that they are in the form of a highly porous, foam-like polyhedral structure, their preparation and their use as absorption agents for water and aqueous solutions.

Hydrophilic, swellable polymers

The present invention relates to hydrophilic, swellable polymers which consists of radicals of the general formula I ##STR1## wherein R.sup.1 to R.sup.3 are defined as stated in the description, and of radicals of a crosslinking agent which have originated from monomers having at least two olefinically unsaturated double bonds, and which are characterized in that they are in the form of a highly porous, foam-like polyhedral structure, their preparation and their use as absorption agents for water and aqueous solutions.

The present invention relates to the use of hydrocarbon-rich gels as fracturing fluids and also to fracturing fluids which are composed of a hydrocarbon-rich gel and an auxiliary.

Use of hydrocarbon-rich gels as fracturing fluids

The present invention relates to compounds of the general formula I ##STR1## in which R.sup.1, R.sup.1', R.sup.2, A and n are as defined in the description, a process for their preparation, their use and also hydrogels prepared using them.

Alkenyl-phosphonic and -phosphinic esters, process for their

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Frankfurt-am-Main, Germany

Friedrich Engelhardt