A water-absorbent resin that can reduce the amount of backflow of an absorbed liquid even when the water-absorbent resin is used at a low content in an absorbent material is provided. An absorbent article comprising an absorbent material containing the resin is also provided. The resin is a crosslinked polymer of a water-soluble ethylenically unsaturated monomer and has a dry-up index of 1.85 or more, as represented by equation (1):

dry-up index=overall absorption capacity term α×water absorption rate term β  (1)

where the overall absorption capacity term α and the water absorption rate term β are determined according to equations (2) and (3):

[00001]$ overall ⁢ ⁢ absorption ⁢ ⁢ capacity ⁢ ⁢ term ⁢ ⁢ α = ( physiological ⁢ ⁢ saline ⁢ ⁢ absorption ⁢ capacity ⁢ ⁢ under ⁢ ⁢ a ⁢ ⁢ load ⁢ ⁢ of ⁢ ⁢ 2.07 ⁢ ⁢ kPa - physiological ⁢ ⁢ saline ⁢ ⁢ abs WATER-ABSORBENT RESIN PARTICLES 20220219140 · 2022-07-14 · Shiho OKAZAWA Water-absorbent resin particles having a gel brightness L* of 8 to 60 measured by a method including the following steps (A), (B), and (C) in this order are disclosed. (A) 0.1 g of water-absorbent resin particles are uniformly scattered in a colorless and transparent round cell for a color-difference meter having an inner diameter of 30 mm. (B) 5.0 g of ion-exchanged water is added to the round cell to cause the water-absorbent resin particles to absorb water. (C) a brightness L* of an obtained gel is measured on a black background after five minutes from the addition of the ion-exchanged water. Absorbent articles and methods of making 11076999 · 2021-08-03 · 3M INNOVATIVE PROPERTIES COMPANY · Jerald K. Rasmussen, Mahfuza B. Ali, Bathsheba E. Chong Conklin, Andrew P. Klein, Scott E. Langer Described herein are absorbent articles and methods of making such articles. The articles are made by bonding a copolymer onto a substrate to form a core. The absorbent articles are particularly useful in personal care product, e.g., disposable hygiene products. ABSORBENT ARTICLES AND METHODS OF MAKING 20170112685 · 2017-04-27 · Jerald K. Rasmussen, Mahfuza B. Ali, Bathsheba E. Chong Conklin, Andrew P. Klein, Scott E. Langer Described herein are absorbent articles and methods of making such articles. The articles are made by bonding a copolymer onto a substrate to form a core. The absorbent articles are particularly useful in personal care product, e.g., disposable hygiene products. Water-absorbent resin particles 12533658 · 2026-01-27 · Sumitomo Seika Chemicals Co., Ltd. · Shiho Okazawa Water-absorbent resin particles having a gel brightness L* of 8 to 60 measured by a method including the following steps (A), (B), and (C) in this order are disclosed. (A) 0.1 g of water-absorbent resin particles are uniformly scattered in a colorless and transparent round cell for a color-difference meter having an inner diameter of 30 mm. (B) 5.0 g of ion-exchanged water is added to the round cell to cause the water-absorbent resin particles to absorb water. (C) a brightness L* of an obtained gel is measured on a black background after five minutes from the addition of the ion-exchanged water. $