PROBLEM TO BE SOLVED: To provide a manufacturing method of a water-absorbing resin particle which has high water retention ability, high water absorption ability under load, and outstanding water absorption speed, in which there is a little water-soluble content, and which can be suitably used for a sanitation material, and to provide the water-absorbing resin particle obtained by the method and a sanitation material using the same.SOLUTION: The manufacturing method of a water-absorbing resin particle comprises polymerizing a water-soluble ethylenically unsaturated monomer, and is characterized in that after performing the polymerization using a water-soluble azo-based radical polymerization initiator under the presence of a multiple valency glycidyl compound as an internal crosslinking agent, the obtained water-absorbing resin is after crosslinked by a post-crosslinking agent.COPYRIGHT: (C)2012,JPO&INPIT【課題】高い保水能、荷重下での高い吸水能、優れた吸水速度を持ち、かつ水可溶分が少ない、衛生材料に好適に使用できる吸水性樹脂粒子の製造方法およびそれによって得られる吸水性樹脂粒子、ならびにそれを用いた衛生材料を提供すること。【解決手段】水溶性エチレン性不飽和単量体を重合させて吸水性樹脂を製造する方法であって、内部架橋剤としての多価グリシジル化合物の存在下、水溶性アゾ系ラジカル重合開始剤を用いて重合を行なった後、得られた吸水性樹脂を後架橋剤で後架橋することを特徴とする吸水性樹脂粒子の製造方法。【選択図】なし
