Bayer Aktiengesellschaft

G&uuml;nter Sackmann

Thomas Roick

Rolf-Volker Meyer

Siegfried Korte

Eckhard Wenz

Johan Kijlstra

Bernd Thiele

Joachim K&ouml;nig

Gisbert Michels

Bernhard Jansen

Ulrich Feldhues

Udo Eckstein

Tillmann Hassel

Walter Sch&auml;fer

Bernd Hauschel

Fritz Novotny

J&uuml;rgen Reiners

Bernhard Hunke

Klaus Struss

Manfred Schnee

Gabriele Kinkel

Hans-Peter Geiger

Sergej Schapowalov

Sergei Schapowalow

Telman Bayburdov

Jgor Nakonetschny

A process for producing a superabsorbent polymer is described. The process that entails a continuous hydrolysis of an aqueous emulsion of crosslinked or uncrosslinked polyacrylonitrile in the form of fine particles is carried out in a cascade of stirred tanks. The reaction with alkali-hydroxide solution an aqueous-alcoholic medium at 60 to 100&deg; C. yields polymers that are suitable for the preparation of hygiene products, water-storing materials in agriculture, and sheathing of electrical cables.

Process for the continuous production of superabsorbent polymers from PAN emulsions

A process for the preparation of superabsorbers is disclosed. The process entails subjecting a polyacrylonitrile precipitation polymer alkaline hydrolysis to obtain a hydrolysis product. The hydrolysate that may optionally be neutralized is dried and ground and optionally modified by crosslinking of its surface. The inventive superabsorber is suitable for the preparation of nappies, incontinence articles, water-storage materials and electric cable coverings.

Process for the preparation of superabsorbent polymers from polyacrylonitrile precipitation polymers

Fine-particle polymer dispersions for paper sizing

The invention relates to polysiloxanes containing carboxyl groups that are useful for imparting water-repellency to substrates, a process for their preparation, a water-repellent system containing such polysiloxanes, and a process for the production of hydrophobic substrates.

Imparting water-repellency with polysiloxanes containing carboxyl groups

Whitened polymers and the use thereof in coating slips for coating substrates

This invention relates to novel aqueous emulsion polymers obtained by free-radical initiated addition polymerization of at least one monomer in the presence of degraded starch and at least one polymeric emulsifier from the series of sulfo-containing maleic anhydride copolymers and/or sulfo-containing oligourethanes with a branched molecular structure. The invention further relates the use of such emulsion polymers as surface sizing agents for paper and paperlike materials.

Sizing agents for paper

A process for modifying superabsorbent polymers is disclosed. The surface of a polymer containing hydrolyzed polyacrylonitrile in the form of particulates, is modified by crosslinking in a water/alcohol reaction mixture and in the presence of silica. The resulting product features improved absorbency under load and lesser degree of gel blocking.

Modified superabsorbent polymer based on polyacrylonitrile emulsions

Growing community of inventors

Leverkusen, Germany

Günter Sackmann

Growing community of inventors

Leverkusen, Germany

G&uuml;nter Sackmann

Günter Sackmann