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Water-Absorbent Resin Particles, Water-Absorbent Article, and Method for Manufacturing Same:

U.S. Patent No. 12,161,537

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By: Tara Olivo

Associate Editor at Nonwovens Industry, Rodman Media

Hiroki Yabuguchi, Himeji, Japan.
Assigned to Sumitomo Seika Chemicals Co., Ltd., Hyogo, Japan.

Filed: 12/12/19
Issued: 12/10/24

Water-absorbing resin particles comprising: a polymer particle comprising a crosslinked polymer having a monomer unit derived from an ethylenically unsaturated monomer including at least one compound selected from the group consisting of (meth)acrylic acid and a salt thereof; and a plurality of inorganic particles disposed on a surface of the polymer particle, wherein a proportion of a (meth)acrylic acid and a salt thereof is 70 to 100 mol % with respect to a total amount of monomer units in the crosslinked polymer, a permeation and spreading index represented by Formula (1) is 10.0 or higher, and a water absorption capacity for a physiological saline solution is 50.0 g/g or more, Formula (1): permeation and spreading index=value of non-pressurization demand wettability (DW) after 1 minute (mL/g)+artificial urine permeation speed when water-absorbing resin particles are swollen 10 times (g/min) (1).

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