Polymerizing the water soluble ethylene characteristic unsaturated monomer, in the water absortion power resin precusor which can, the below-mentioned general formula (1):(In formula, R carbon count shows the alkyl group of 1 - 6, n shows integer 0 - 6.)So adding and heating the bisuokisetan chemical compound which is displayed it can by the production method, and the said production method of the water absortion power resin which features that rear it builds a bridge reacts, physiological brine preservation water talent physiological brine water absorption power above 30g/g and under the 2.07kPa load above 15ml/g, water soluble amount 20 mass % the water absortion power resin which features that it is below. The water absortion power resin which can by the production method of this invention, to be superior in efficiencies such as preservation water talent and water absorption power under the load, because you have considered even in safety such that at the same time water soluble amount is small, for example, the paper diaper, hygienic material such as incontinence pad and sanitary napkin, it can use for ideal in the especially paper diaper.水溶性エチレン性不飽和単量体を重合して得られる吸水性樹脂前駆体に、下記一般式(1):(式中、Rは炭素数1~6のアルキル基を示し、nは0~6の整数を示す。)で表されるビスオキセタン化合物を添加、加熱して後架橋反応させることを特徴とする吸水性樹脂の製造方法、および該製造方法によって得られる、生理食塩水保水能が30g/g以上、2.07kPa荷重下での生理食塩水吸水能が15ml/g以上、水可溶分が20質量%以下であることを特徴とする吸水性樹脂。本発明の製造方法によって得られた吸水性樹脂は、保水能、荷重下での吸水能等の諸性能に優れ、かつ水可溶分が少ない等の安全性にも配慮しているので、例えば、紙おむつ、失禁パッド、生理用ナプキン等の衛生材料、特に紙おむつに好適に使用することができる。
