PROBLEM TO BE SOLVED: To provide a water absorbing agent capable of keeping excellent water absorbing properties for a long time even when a urine composition is changed.SOLUTION: A particulate water absorbing agent containing as a main component, a water absorbing resin obtained by cross-linking polymerization of an unsaturated monomer is provided. The particulate water absorbing agent satisfies: centrifuge retention capacity (CRC) in a physiological saline solution is &ge32 g/g mass median particle size (D50) is 200-400 &mum a ratio of particles having diameter of <150 &mum is 0-2 mass% increased extractables by deterioration is 0-15 mass% and extractables for one hour in deterioration test is 0.1-30 mass%.COPYRIGHT: (C)2012,JPO&INPIT【課題】尿組成が変化しても優れた吸水特性を長時間維持する、吸水剤を提供する。【解決手段】不飽和単量体を架橋重合した吸水性樹脂を主成分とする粒子状吸水剤であって、生理食塩水への無加圧下吸収倍率(CRC)が32g/g以上、質量平均粒子径(D50)が200~400μm、150μm未満の粒子が0~2質量%、可溶分劣化増加量が0~15質量%、かつ劣化試験液での1時間可溶分が0.1~30質量%の吸水剤である。【選択図】なし
