Evonik Degussa Gmbh

Evonik Stockhausen Gmbh

Evonik Operations Gmbh

Evonik Corporation

Evonik Superabsorber Gmbh

Christoph Loick

Laurent Wattebled

Frank Schubert

Stanley A McIntosh

Matthias Naumann

Jorg Harren

Dominik Gartz

Scott J Smith

Frank Loeker

Jörg Harren

Scott Smith

Stefan Leininger

Michael M Azad

Markus Henn

Peter Herbe

Anne Ix-Mund

Nicolaas De Bruin

Ingo Loy

Mathias Naumann

Michael Azad

The present invention relates to an anti-stick processing aid for use in a process for producing water-absorbing polymers, comprising the steps of: i) mixing (&#x3b1;1) 0.1 to 99.999% by weight of polymerizable, ethylenically unsaturated monomers containing acid groups, or salts thereof, (&#x3b1;2) 0 to 70% by weight of monomers copolymerizable with (&#x3b1;1), (&#x3b1;3) 0.001 to 10% by weight of crosslinkers, (&#x3b1;4) 0 to 30% by weight of polymers, (&#x3b1;5) 0 to 80% by weight of water, and (&#x3b1;6) 0 to 20% by weight of assistants, (ii) free-radical polymerization with crosslinking to form a hydrogel polymer, (iii) drying the hydrogel polymer, (iv) grinding and sieving the hydrogel polymer, (v) surface postcrosslinking the hydrogel polymer and (vi) drying and finishing the water-absorbing polymer,wherein the anti-stick processing aid is used before and/or in steps (iii).

Anti-stick processing aids and use thereof in the production of water-absorbing particles

The present invention relates to a water-absorbing polymer and to a process for preparation, including finishing the water-absorbing polymer, with 0.0001 to 3% by weight, of a peroxo compound, based on the acrylic acid, after the polymerization is treated, and to a process for producing a hydrogel polymer, to the product of the process and to use.

Superabsorbent polymers with improved odor control capacity and process for the production thereof

Described is the production of water-absorbing polymeric particles by polymerizing a monomer solution or suspension comprising a) at least one ethylenically unsaturated acid-functional monomer which is optionally at least partly present as salt, b) at least one crosslinker and c) at least one initiator, wherein the process further comprises drying the resulting polymer and also optionally grinding the dried polymer and sieving the ground polymer and also optionally surface-postcrosslinking the dried and possibly ground and sieved polymer, and wherein the polymerization is carried out in the presence of aminopolycarboxylic acids and/or salts thereof, in particular in the presence of ethylenediaminedisuccinic acid and/or a salt thereof.

Aminopolycarboxylic acids useful as processing aids in the manufacture of superabsorbents

The present invention relates to a particulate absorbent polymer material having:

Super-absorbing polymers with rapid absorption properties and method for producing the same

A process for producing a water-absorbing polymer composition, comprising the process steps of (i) mixing (&#x3b1;1) 0.1 to 99.999% by weight of ethylenically unsaturated monomers containing acid groups or salts thereof (&#x3b1;2) 0 to 70% by weight of polymerized, ethylenically unsaturated monomers copolymerizable with (&#x3b1;1), (&#x3b1;3) 0.001 to 10% by weight of one or more crosslinkers, (&#x3b1;4) 0 to 30% by weight of water-soluble polymers, and (&#x3b1;5) 0 to 20% by weight of one or more assistants, where the sum of their weights (&#x3b1;1) to (&#x3b1;5) is 100% by weight, (ii) free-radical polymerization with crosslinking to form a water-insoluble aqueous untreated hydrogel polymer, and surface postcrosslinking the ground hydrogel polymer wherein blowing agents having a particle size of 100 &#x3bc;m to 900 &#x3bc;m are added to the aqueous monomer solution prior to the addition of the initiator and the start of the free-radical polymerization.

Water-absorbing polymer having a high absorption rate

The present invention further relates to a particulate superabsorbent polymer composition comprising a crosslinker composition that is the reaction product selected from (i) saturated amines and/or saturated polyamines with ethylenically unsaturated glycidyl compounds and/or ethylenically unsaturated polyglycidyl compounds, (ii) ethylenically unsaturated amines and/or ethylenically unsaturated polyamines with saturated glycidyl compounds and/or saturated polyglycidyl compounds, or (iii) ethylenically unsaturated amines and/or ethylenically unsaturated polyamines with ethylenically unsaturated glycidyl compounds and/or ethylenically unsaturated polyglycidyl compounds; and a surface crosslinking agent applied to the particle surface. The present invention further relates to an absorbent article that includes such particulate superabsorbent polymer compositions.

Superabsorbent polymer with crosslinker

A process for producing a water-absorbing polymer comprises: (i) mixing (&#x3b1;1) 0.1-99.99% by weight of ethylenically unsaturated monomers containing acid groups or salts thereof, or ethylenically unsaturated monomers including a protonated or quaternized nitrogen, or mixtures thereof, (&#x3b1;2) 0-70% by weight of ethylenically unsaturated monomers copolymerizable with (&#x3b1;1), (&#x3b1;3) 0.001-10% by weight of one or more crosslinkers, (&#x3b1;4) 0-30% by weight of water-soluble polymers, and (&#x3b1;5) 0-20% by weight of one or more assistants, where the sum of the weights (&#x3b1;1) to (&#x3b1;5) is 100%; (ii) free-radical polymerization with crosslinking to form an untreated hydrogel polymer; (iii) coarse comminution of the untreated hydrogel polymer to give pieces having a diameter from 0.1 mm to 5.0 cm; (iv) cooling and grinding the untreated hydrogel polymer; (v) drying the untreated hydrogel polymer after grinding at a temperature from 85&#xb0; C. to 260&#xb0; C.; (vi) postcrosslinking the hydrogel polymer and (vii) drying the water-absorbing polymer.

Process for producing improved absorbent polymers by means of cryogenic grinding

The present invention further relates to a process to make a superabsorbent polymer comprising the steps of a) preparing a neutralized monomer solution comprising a polymerizable monomer selected from unsaturated acid groups-containing monomers, ethylenically unsaturated carboxylic acid anhydride, salts, or derivatives thereof and a caustic agent selection from an alkali agent, wherein the polymerizable monomer is neutralized to from about 50 mol % to about 85 mol %; b) forming a crosslinker monomer mixture by adding an internal crosslinker composition to the neutralized monomer solution wherein the internal crosslinking composition is the reaction product of a stoichiometric excess of amine with a glycidyl compound, wherein the internal crosslinker composition has a residual amount of glycidyl compounds of less than about 500 ppm based on the mass of the internal crosslinker composition; and c) polymerizing the crosslinker monomer mixture to make a superabsorbent polymer.

Process for superabsorbent polymer and crosslinker composition

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Tonisvorst, Germany

Christoph Loick