Basf Se Corporation

Basf Aktiengesellschaft

Hoechst Aktiengesellschaft

Basf Corporation

Clariant Corporation

Basf (thai) Ltd.

Norbert Herfert

Thomas Daniel

Michael A Mitchell

Stephan Bauer

Fritz Engelhardt

Rüdiger Funk

Ulrich Riegel

Mariola Wanior

Rudolf Schliwa

Jürgen Freiberg

Friedrich Engelhardt

Uwe Stueven

Marco Krüger

Stefan Blei

Katrin Baumann

Christophe Bauduin

Birgit Reinhard

Guy T Woodrum

Michael M Azad

Matthias Weismantel

Rainer Dobrawa

Francisco Javier Lopez Villanueva

Martin Beck

Uwe Stuven

Horst Baumgartl

Volker Frenz

Hans-Joachim H&auml;hnle

Hanno Rüdiger Wolf

Peter W Carrico

R&uuml;diger Funk

Ulrich Hammon

Wilfried Heide

Robert Bayer

Mark Elliott

Monte Alan Peterson

Annemarie Hillebrecht

Karl Possemiers

Martin Wendker

Ma-Ikay Miatudila

Thomas Gieger

Bernhard Mohr

Detlev Seip

Hermann Josef Feise

Holger Barthel

Karin Flore

Joachim Dentler

Katarzyna Dobrosielska-Oura

Uwe Stüven

Uwe St&uuml;ven

Wanthip Poomsuwan

Patricia D Brown

J&uuml;rgen Huff

Yvonne Hagen

Kristine Hartnagel

Carolin Nadine Dücker

Gustav Remmel

James C Robinson

Helmut Klotzsche

Olaf Hoeller

Lydia König

Renate Wuestefeld

Bootsara Parchana

Thomas H Majette

Patrick Neal Hamilton

Xiana Romani Fernandez

William G-j Chiang

William E Volz

Tanyatorn Sitkhunthod

Somjate Sonkaew

Andrea Karen Bennett

Renate Wüstefeld

Marcus Schöppler

Herman Josef Feise

Bill Chiang

Jim Robinson

James Hill

Peannapa Arsoon

Michael Young

Tom Woodrum

Michael Mitchell

William G-J Chiang

Marcus SCHÖPPLER

Paul Walter Mccormack

In an improved superabsorbent complexed with aluminum ions, the aluminum ions are applied in the form of an aqueous solution comprising aluminum ions, which has the feature that it comprises aluminum ions in a proportion within the range of 0.5%-15% by weight (converted if appropriate to Al), based on the total mass of the solution, and further comprises anions of lactic acid (lactate ions) and phosphoric acid (phosphate ions), where the molar proportion of the lactate ions is within the range of 0.01-2.99 times the molar amount of Aland the molar proportion of the phosphate ions is within the range of 0.01-2.99 times the molar amount of Al.

Superabsorbent complexed with aluminum ions

The present invention relates to a process for producing surface-postcrosslinked water-absorbent polymer particles by coating of water-absorbent polymer particles having a content of residual monomers in the range from 0.03 to 15% by weight with at least one surface-postcrosslinker and thermal surface-postcrosslinking at temperatures in the range from 100 to 180&#xb0; C.

Process for producing surface-postcrosslinked water-absorbent polymer particles

An absorbent core and an absorbent article respectively with improved properties, especially rewet performance, are disclosed. The absorbent core has at least two layers, wherein each layer comprising from 0 to 10% by weight fibrous material and from 90 to 100% by weight water-absorbent polymer particles, based on the sum of water-absorbent polymer particles and fibrous material. The surface-postcrosslinked water absorbent polymer particles within the upper layer have a sphericity of at least 0.89 and a CRC of at least 34 g/g. Preferably the water-absorbent polymer particles have a sphericity of at least 0.89 and the sum of the CRC and AUL (0.3 psi, 21 g cm) (EDANA 442.2-02) of the water absorbent polymer particles is at least 65 g/g.

Ultrathin fluid-absorbent article

The invention relates to a process for producing superabsorbents, comprising the preparation of partly neutralized acrylic acid by the steps (i) preparing an over-neutralized acrylic acid having a degree of neutralization of at least 100.1 mol-% by mixing of an acrylic acid 1 and a base and (ii) preparing a neutralized acrylic acid having a degree of neutralization from 50 to 85 mol-% by mixing of the over-neutralized acrylic acid and an acrylic acid 2, wherein the content of dimeric acrylic acid in the acrylic acid 2 is lower than the content of dimeric acrylic acid in the acrylic acid 1.

Process for producing superabsorbents

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution comprising less than 0.3% by weight of persulfate and at least 0.05% by weight of azo initiator and thermal aftertreatment of the formed polymer particles at less than 100&#xb0; C. in a fluidized bed for 60 to 300 minutes.

Process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase in a reactor comprising a gas distributor (), a reaction zone () and a fluidized bed (), the gas leaving the reactor is treated in a condenser column () with an aqueous solution, the treated gas leaving the condenser column () is recycled at least partly to the fluidized bed (), wherein the gas leaving the condenser column () comprises from 0.05 to 0.3 kg steam per kg dry gas and the steam content of the gas entering the gas distributor () is less than 80% of the steam content of the gas leaving the condenser column ().

A process for removing residual monomers from water-absorbing polymer particles by thermally aftertreating the water-absorbing polymer particles in a mixer with rotating mixing tools at a temperature of at least 60&#xb0; C. in the presence of water and of a surfactant.

Method for removal of residual monomers from water-absorbing polymer particles

A process for replacing the stabilization of (meth)acrylic monomers, wherein phenothiazine is removed from phenothiazine-containing (meth)acrylic monomers by adsorption on activated carbon, and then a moderately active polymerization inhibitor is optionally added.

Method for the restabilization of (meth)acrylic monomers

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130&#xb0; C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores.

Water-absorbent polymer particles

A process for producing water-absorbing polymer particles by polymerizing droplets of a monomer solution in a surrounding gas phase, wherein the polymer particles are coated with a permeability improver.

Method for producing permeable water-absorbing polymer particles through polymerization of drops of a monomer solution

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, which comprises coating the water-absorbing polymer particles with at least one sulfinic acid, sulfonic acid and/or salts thereof.

Water absorbent polymer particles formed by polymerizing droplets of a monomer solution and coated with sulfinic acid, sulfonic acid, and/or salts thereof

A superabsorbent produced by polymerizing a monomer mixture which comprises at least one ethylenically unsaturated monomer bearing at least one acid group, at least 0.1% by weight and at most 20% by weight, based on the total amount of ethylenically unsaturated monomers bearing at least one acid group (calculated as the free acid), of at least one alkaline earth metal salt (calculated without water of crystallization) selected from the salts of calcium, strontium or barium having been added before or during the polymerization and/or, if the polymerization is followed by a separate drying step, to the polymer before the drying, exhibits improved stability to discoloration in the course of storage under elevated temperatures and/or elevated air humidity.

Color-stable superabsorber

A process for producing water-absorbing polymer particles, wherein at least one inorganic phosphoric acid and/or salt thereof and at least one organic 2-hydroxy acid and/or salt thereof is added, where the phosphorus in the inorganic phosphoric acid has an oxidation number of less than +V and the organic 2-hydroxy acid does not have any ethylenically unsaturated groups, and also the water-absorbing polymer particles obtainable by the process according to the invention.

Process for producing water absorbing polymer particles with improved color stability

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Altenstadt, Germany

Norbert Herfert