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1. (WO2018159802) WATER-ABSORBING RESIN, AND ABSORBENT ARTICLE

Pub. No.:    WO/2018/159802    International Application No.:    PCT/JP2018/007961
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Sat Mar 03 00:59:59 CET 2018
IPC: C08F 20/06
B01J 20/26
B01J 20/28
C08F 220/04
Applicants: SUMITOMO SEIKA CHEMICALS CO., LTD.
住友精化株式会社
Inventors: CHIBA, Mikihito
千葉 実季人
ONODA, Yuichi
小野田 裕一
Title: WATER-ABSORBING RESIN, AND ABSORBENT ARTICLE
Abstract:
Provided is a water-absorbing resin that exhibits excellent absorption performance and a high permeation rate with respect to liquids to be absorbed, and that effectively reduces liquid leakages, even in an absorbent body using a large amount of the water-absorbing resin. The water-absorbing resin is formed from a polymer of a water-soluble ethylenically unsaturated monomer, and when a cross-sectional image of the water-absorbing resin obtained by X-ray computer tomography is observed, the ratio (cavity area ratio) as calculated by formula (I) of the area of cavity portions in the cross-sectional image is 2-10%, and the particle diameter is 250-500μm. The liquid flow rate index as calculated by formula (II) when a physiological saline liquid flow rate test is performed at 37°C is 5-20. (I) Cavity area ratio [%] = {total cross-sectional area (B) of cavity portions in the water-absorbing resin/(total cross-sectional area (A) of resin portions in the water-absorbing resin + total cross-sectional area (B) of cavity portions in the water-absorbing resin)×100} (II) Liquid flow rate index = {liquid flow rate (CPR2) during 10 second period between 50 seconds and 60 seconds after initiation of liquid flow/liquid flow rate (CPR1) during 10 second period after initiation of liquid flow}×100