WATER ABSORBENT

• Main Authors: TORII ICHIJI, MITSUKAMI YOSHIRO, IMURA MOTOHIRO, IWAMURA TAKU
• Format: Patent
• Language: English
• Published: 24.09.2004
• Edition: 7
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; 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; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MEDICAL OR VETERINARY SCIENCE; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PROSTHESES; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OR PROTECTION OF EYES OR EARS

PROBLEM TO BE SOLVED: To provide a water absorbent having performance of both of capillary attraction and liquid permeability in combination. SOLUTION: The water absorbent is obtained by crosslinking polymerization of acrylic acid and/or a monomer containing its salt and contains a water absorptive resin particle (α) subjected to surface crosslinking treatment and a liquid permeability improving agent (β), in which the mass average particle size of the water absorbent is 234 to 394 μm, the logarithmic standard deviation (σζ) of a grain size distribution is 0.25 to 0.45, the absorption magnification under non-pressurization is ≥15 g/g, the water soluble component is ≤15 mass% and the content of the liquid permeability improving agent (β) ranges from 0.01 to 5 parts by mass per 100 parts water absorptive resin particle (α). COPYRIGHT: (C)2004,JPO&NCIPI