Title:
WATER-ABSORBING RESIN, AND ABSORBENT ARTICLE
Document Type and Number:
WIPO Patent Application WO/2018/159802
Kind Code:
A1
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
Inventors:
CHIBA MIKIHITO (JP)
ONODA YUICHI (JP)
ONODA YUICHI (JP)
Application Number:
PCT/JP2018/007961
Publication Date:
September 07, 2018
Filing Date:
March 02, 2018
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
B01J20/26; C08F20/06; B01J20/28; C08F220/04
Foreign References:
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Other References:
FREDRIC L. BUCHHOLZ, ANDREW T. GRAHAM: "Modern Superabsorbent Polymer Technology", 1998, WILEY-VCH, article FREDRIC L. BUCHHOLZ, ANDREW T. GRAHAM, pages: 167, 194, 211-212, 214 - 217, XP055881661
Attorney, Agent or Firm:
TANAKA, Junya et al. (JP)
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