Method for the production of water absorbing polymers

A process for producing a water-absorbing polymer by polymerizing a monomer solution and drying the resulting hydrogel by means of a heated gas stream comprises effecting the drying in two or more temperature zones, and/or the gas stream is flowed against the hydrogel upwardly in the upstream sector...

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Bibliographic Details
Main Authors BRUHNS STEFAN, WEISMANTEL MATTHIAS, VAN ESBROECK DOMINICUS
Format Patent
LanguageEnglish
Published 26.11.2013
Subjects
ADHESIVES
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
DYES
GENERAL PROCESSES OF COMPOUNDING
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
ORGANIC MACROMOLECULAR COMPOUNDS
PAINTS
POLISHES
THEIR PREPARATION OR CHEMICAL WORKING-UP
WORKING-UP
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Summary:A process for producing a water-absorbing polymer by polymerizing a monomer solution and drying the resulting hydrogel by means of a heated gas stream comprises effecting the drying in two or more temperature zones, and/or the gas stream is flowed against the hydrogel upwardly in the upstream sector of the belt dryer and downwardly in the downstream sector of the belt dryer, the direction of flow being reversed at a water content of 15% to 45% by weight for the hydrogel, and/or the hydrogel layer is flowed against in a belt dryer upwardly to some extent at least, the gas velocity being 5% to 30% of the gas velocity required to lift the hydrogel off the belt, also apparatus for carrying out the process and use of the water-absorbing polymers produced by the process to produce hygiene articles.
Bibliography:Application Number: US20060816769