Superabsorbent polymers from crosslinked poly(acrylonitrile) emulsions

Super-absorbent polymers (I) based on partly hydrolysed homo- and/or co-polymers of acrylonitrile (PAN) crosslinked with polyfunctional comonomers have 30-80 mole% of the nitrile gps. converted into carboxylate gps., 20-70 mole% into amide gps. and 0-20 mole% unchanged. The crosslinked polymers have...

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Hauptverfasser:	SACKMANN, GUENTER, SCHAPOWALOW, SERGEI, KORTE, SIEGFRIED, SZABLIKOWSKI, KLAUS, KOCH, WOLFGANG
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS BANDAGES, DRESSINGS OR ABSORBENT PADS BASIC ELECTRIC ELEMENTS CABLES CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON CONDUCTORS DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS DISINFECTION, STERILISATION, OR DEODORISATION OF AIR ELECTRICITY FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE INSULATORS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METALLURGY METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PROSTHESES SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	Super-absorbent polymers (I) based on partly hydrolysed homo- and/or co-polymers of acrylonitrile (PAN) crosslinked with polyfunctional comonomers have 30-80 mole% of the nitrile gps. converted into carboxylate gps., 20-70 mole% into amide gps. and 0-20 mole% unchanged. The crosslinked polymers have a swelling capacity of up to 700 g/g in water and up to 60 g/g in physiological saline, and a gel strength of 20-100g. Also claimed is a process for the prodn. of (I) by partial hydrolysis of finely divided aq. emulsions of crosslinked acrylonitrile (co)polymers with aq. alkali hydroxide soln., followed by precipitation with water-miscible organic solvent, sepn., drying and opt. heating for a short time.