PRODUCTION METHOD OF WATER-ABSORBENT RESIN

PROBLEM TO BE SOLVED: To provide a production method by which a water-absorbent resin of excellent quality can be obtained at low cost by reasonable steps in aqueous solution polymerization. SOLUTION: The method for producing a water-absorbent resin comprises polymerizing a monomer component includi...

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Hauptverfasser:	FUJITA YASUHIRO, AZUMI TAKASHI, IRIE YOSHIO, FUJINO SHINICHI, DAIROKU YORIMICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BANDAGES, DRESSINGS OR ABSORBENT PADS CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES CHEMISTRY COMPOSITIONS BASED THEREON DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS DISINFECTION, STERILISATION, OR DEODORISATION OF AIR FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE 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 ORGANIC MACROMOLECULAR COMPOUNDS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PROSTHESES THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a production method by which a water-absorbent resin of excellent quality can be obtained at low cost by reasonable steps in aqueous solution polymerization. SOLUTION: The method for producing a water-absorbent resin comprises polymerizing a monomer component including acrylic acid and/or its sodium salt as major components in an aqueous solution to produce a water-absorbent resin, wherein: (1) the aqueous solution has a monomer component concentration of at least 45 wt.%; (2) the polymerization is carried out while water is evaporated so that the ratio (concentration ratio) between a solid component concentration in a hydropolymer as formed by the polymerization and a solid component concentration in the aqueous monomer solution may be at least 1.10; and (3) the solid component concentration in the hydropolymer as formed by the polymerization is at most 80 wt.%. COPYRIGHT: (C)2011,JPO&INPIT