A method for producing a water-absorbent resin, characterized by adding a bisoxetane compound represented by the following general formula (1):
wherein R is an alkyl group having 1 to 6 carbon atoms; and n is an integer of from 0 to 6,
to a water-absorbent resin precursor obtainable by polymerizing water-soluble ethylenically unsaturated monomers, and subjecting the components to a post-crosslinking reaction while heating; and a water-absorbent resin obtainable by the method, characterized in that the water-absorbent resin has a retention capacity of physiological saline of 30 g/g or more, an absorption capacity of physiological saline under a load of 2.07 kPa of 15 ml/g or more, and a water-soluble substance of 20% by mass or less. The water-absorbent resin obtained by the method of the present invention is excellent in properties such as water-retention capacity, and water-absorption capacity under load, and also gives consideration to safety of the water-absorbent resin by reducing water-soluble substance. Therefore, the water-absorbent resin of the present invention can be preferably used, for example, in hygienic materials such as disposable diaper, incontinence pad and sanitary napkin, in particular, in disposable diaper.
一种生产吸
水性
树脂的方法,其特征在于加入由以下通式(1)代表的双氧杂
环丁烷化合物:
其中 R 是具有 1 至 6 个碳原子的烷基;n 是 0 至 6 的整数、
通过聚合
水溶性
乙烯基不饱和单体,并使各组分在加热过程中进行后交联反应而得到的吸
水性
树脂前体;以及通过该方法得到的吸
水性
树脂,其特征在于该吸
水性
树脂对生理盐
水的保持能力为 30 g/g 或以上,在 2.07 kPa 负荷下对生理盐
水的吸收能力为 15 ml/g 或以上,
水溶性物质的质量分数为 20% 或以下。通过本发明的方法得到的吸
水性
树脂在保
水能力和负载下的吸
水能力等性能方面都很出色,而且还通过减少
水溶性物质考虑到了吸
水性
树脂的安全性。因此,本发明的吸
水性
树脂可优先用于一次性尿布、失禁垫和卫生巾等卫生材料,特别是一次性尿布。