WATER-ABSORBING RESIN AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: KOBAYASHI HIROSHI, ADACHI YOSHIJI, ISHIZAKI KUNIHIKO
• Format: Patent
• Language: English
• Published: 19.04.2012
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; 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; GENERAL PROCESSES OF COMPOUNDING; 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; WORKING-UP

PROBLEM TO BE SOLVED: To provide a water-absorbing resin with high productivity, which is a water-absorbing resin obtained by using a raw material derived from biomass, and exhibits a high water absorption rate capable of sufficiently responding to required performance in practical use and in particular, a high water absorption rate under no pressure and a high water absorption rate under pressure.SOLUTION: A method for producing the water-absorbing resin includes: a polymerizing step of an aqueous monomer solution containing, as an essential component, an acid group-containing unsaturated monomer; a drying step of the obtained water-containing gel; and a surface crosslinking step of crosslinking the surface of water-absorbing resin particles after drying. In the polymerization step, polysaccharides are mixed at such a stage that the polymerization rate is higher than 0 mol% and not higher than 90 mol%, and further, polymerization is advanced.