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1. (WO2018159801) WATER-ABSORBENT RESIN, SOIL WATER-RETAINING MATERIAL, AND AGRICULTURAL/HORTICULTURAL MATERIAL

Pub. No.:    WO/2018/159801    International Application No.:    PCT/JP2018/007960
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
C08J 3/24
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-ABSORBENT RESIN, SOIL WATER-RETAINING MATERIAL, AND AGRICULTURAL/HORTICULTURAL MATERIAL
Abstract:
Provided is a water-absorbent resin that is highly water-absorbent but is also highly capable of discharging water. This water-absorbent resin is configured from a polymer of water-soluble ethylenic unsaturated monomers. When a cross-sectional image of the water-absorbent resin is observed by x-ray computed tomography, the fraction of the area of the cross-sectional image that is hollow portions (the hollow area ratio of the cross-sectional image), as calculated on the basis of formula (I), is at least 5%. (I) Hollow area ratio [%]={total cross-sectional area (B) of hollow portions of the water-absorbent resin/(total cross-sectional area (A) of resin portions of the water-absorbent resin + total cross-sectional area (B) of hollow portions of the water-absorbent resin)}×100%.