New polymer particles which are useful for absorption of aqueous fluids

Polymer particles which absorb water, aqueous fluids and serous fluids are claimed. The polymers comprise hydrogel polymers which contain carboxylate groups. The particles are crosslinked on the surface in the powder state. The particles may be prepared (i) by coating with at least one polyalkylene...

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Bibliographische Detailangaben
Hauptverfasser:	BREITBACH, LUDGER., 47269 DUISBURG, DE, MERTENS, RICHARD., 47803 KREFELD, DE
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BANDAGES, DRESSINGS OR ABSORBENT PADS CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS DISINFECTION, STERILISATION, OR DEODORISATION OF AIR FERTILISERS FERTILISERS CHARACTERISED BY THEIR FORM FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION GENERAL PROCESSES OF COMPOUNDING HUMAN NECESSITIES HYGIENE MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MANUFACTURE THEREOF MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METALLURGY METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENTSUBCLASSES OF CLASS C05 MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVINGA SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES,SOIL-CONDITIONERS, WETTING AGENTS ORGANIC MACROMOLECULAR COMPOUNDS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PROSTHESES THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OR PROTECTION OF EYES OR EARS WORKING-UP
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Beschreibung
Zusammenfassung:	Polymer particles which absorb water, aqueous fluids and serous fluids are claimed. The polymers comprise hydrogel polymers which contain carboxylate groups. The particles are crosslinked on the surface in the powder state. The particles may be prepared (i) by coating with at least one polyalkylene glycol in the hydrogel state, and (ii) with a surface crosslinker which is free of polyalkylene glycol. Also claimed is the preparation of particles (as described above) comprising: (a) moistening (at least partially) particles of a hydrogel of a water-absorbing polymer with at least one polyalkylene glycol, in direct form or in the form of a solution; (b) drying the mixture of polymer and polyalkylene glycol under conditions such that a powdery, flowable state is achieved; (c) optionally reducing the particle size of the dried, coated absorbent polymer, using mechanical means; (d) coating the dried particles of water-absorbent polymer with a surface crosslinker, in direct form of in the form of a solution; and (e) heating the coated, water-absorbent particles under conditions such that the surface crosslinker and carboxyl groups of the water-absorbent polymer react, resulting in crosslinking of the surface.