PROBLEM TO BE SOLVED: To provide a method for production of absorbing resin efficiently reducing residual monomers in a short time without reducing performance of the absorbing resin.SOLUTION: The invention relates to the method for producing absorbing resin including a crosslinked polymer (A) comprising (a1) a water soluble vinyl monomer and/or (a2) a hydrolyzable vinyl monomer, and (b) a crosslinking agent as indispensable constituent units, wherein the method is characterized by including a freeze-drying process for freeze-drying a water-containing gel (B) of the crosslinked polymer (A) at -50°C to -10°C, and then washing the dried product (C) with alcohol.COPYRIGHT: (C)2012,JPO&INPIT【課題】吸収性樹脂自体の性能を落とさずに、短時間で効率よく残存モノマーを低減する吸収性樹脂の製造方法を提供する。【解決手段】水溶性ビニルモノマー(a1)及び/又は加水分解性ビニルモノマー(a2)、並びに架橋剤(b)を必須構成単位とする架橋重合体(A)を含んでなる吸収性樹脂の製造方法において、架橋重合体(A)の含水ゲル(B)を-50~-10℃で真空凍結乾燥し、得られる乾燥物(C)をアルコール洗浄する工程を含むことを特徴とする吸収性樹脂の製造方法。【選択図】なし
