Starchem, Inc.

Huels Aktiengesellschaft

Chemische Fabrik Stockhausen Gmbh

Klaus Heidel

Frank Krause

Peter Hofmann

Wulf Ruback

Sigrid Scholz-Weigl

Frank Zimmermann

The preparation of terpolymers by free radical polymerization of an unsaturated dicarboxylic acid with an unsaturated monocarxylic acid and a further saturated monomer which contains no free carboxyl groups, in an aqueous medium, is carried out, according to the invention, in the presence of surfactant compounds.

Process for the preparation of dicarboxylic acid terpolymers for

Fine-particle, water-swellable polysaccharide graft copolymers by prepared inverse suspension polymerization of 5 to 40 parts of polysaccharide and 95 to 60 parts of an olefinically unsaturated carboxylic acid, in which an aqueous phase which contains the olefinically unsaturated carboxylic acid, polymerization initiator and 100 to 75 wt. % of the polysaccharide is metered into a hydrophobic solvent which contains 0 to 25 wt. % of the polysaccharide at 40.degree. to 100.degree. C., exhibit improved absorptivity properties and particle size distribution.

Process for the preparation of fine-particle, water-swellable

Polysaccharide graft polymers are prepared by semi-continuous reverse-phase suspension polymerization, partial dewatering and crosslinking, wherein during and after the suspension polymerization, in which an aqueous solution of an at least partially neutralized, olefinically unsaturated carboxylic acid is added to a suspension of a polysaccharide in a nonpolar organic solvent, the viscosity is reduced by adding amphoteric ammonium compounds or quaternary imidazolinium salts to the reaction medium.

Process for the peparation of finely divided, water-swellable

Finely divided polysaccharide graft polymers having a high absorption capacity for urine and water are prepared by semi-continuous reverse-phase suspension polymerization, in which an aqueous solution of an unsaturated carboxylic acid and an initiator is metered continuously into a suspension of a polysaccharide in an organic solvent and the polymer obtained is subsequently partial dehydrated and the crosslinked.

Process for the preparation of finely divided, water-swellable

Water-absorbing and water-swellable polysaccharide graft polymers are prepared by inverse suspension polymerization of a polysaccharide with an ethylenically unsaturated monomer containing a carboxyl group followed by partial water removal and crosslinking.

Process for preparing water-absorbing and water-swellable polysaccharide

The invention relates to a process for the production of low-viscosity, aqueous dispersions of gelatinized, starches, and to dispersions produced thereby. The viscosity is considerably reduced by adding a nonionic tenside from the group of unilaterally etherified polyoxyalkylene glycols, so that up to 50% strength, stirrable dispersions of gelatinized starch can be produced.

Process for producing low-viscosity starch dispersions

The invention relates to a single-stage method of producing polysaccharide g FD-water/g polymers. Fine particulate graft polymers with very high water absorption capacity can be prepared by employing a nonionic lipophilic surface active agent and a nonionic hydrophilic surface active agent.

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Marl, Germany

Klaus Heidel