PROBLEM TO BE SOLVED: To provide a water-absorbing resin with high productivity, which is a water-absorbing resin obtained by using a raw material derived from biomass, and exhibits a high water absorption rate capable of sufficiently responding to required performance in practical use and in particular, a high water absorption rate under no pressure and a high water absorption rate under pressure.SOLUTION: A method for producing the water-absorbing resin includes: a polymerizing step of an aqueous monomer solution containing, as an essential component, an acid group-containing unsaturated monomer a drying step of the obtained water-containing gel and a surface crosslinking step of crosslinking the surface of water-absorbing resin particles after drying. In the polymerization step, polysaccharides are mixed at such a stage that the polymerization rate is higher than 0 mol% and not higher than 90 mol%, and further, polymerization is advanced.COPYRIGHT: (C)2012,JPO&INPIT【課題】バイオマス由来原料を使用した吸水性樹脂であって、しかも実使用時の要求性能にも十分こたえることのできる高い吸水倍率、特に高い無加圧下吸水倍率と高い加圧下吸水倍率を発現する吸水性樹脂を高生産性で提供することにある。【解決手段】酸基含有不飽和単量体を必須成分とする単量体水溶液の重合工程、得られた含水ゲルの乾燥工程、乾燥後の吸水性樹脂粒子を表面架橋する表面架橋工程を含む吸水性樹脂の製造方法であって、重合工程途中の重合率0を超えて90モル%以下の段階で多糖類を混合してさらに重合を進行させる、吸水性樹脂の製造方法。【選択図】なし
