PROCESS FOR THE PRODUCTION OF WATER-ABSORBING RESINS AND WATER-ABSORBING RESINS OBTAINED BY THE PROCESS
申请人:Sumitomo Seika Chemicals CO. LTD.
公开号:EP2204388A1
公开(公告)日:2010-07-07
A method for producing a water-absorbent resin, characterized by adding an oxetane compound represented by the following general formula (1):
wherein R1 is an alkyl group having 1 to 6 carbon atoms; R2 is an alkanediyl group having 1 to 6 carbon atoms; and X is an atomic group containing at least one group selected from the group consisting of carbonyl group, phosphoryl group, and sulfonyl group, 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 as defined above, characterized in that the water-absorbent resin has a water-retention capacity of physiological saline of 30 g/g or more, a water-absorption capacity of physiological saline under load of 2.07 kPa of 28 mL/g or more, and a water-soluble substance of 20% by mass or less. Since the water-absorbent resin obtained by the method of the present invention is excellent in various properties such as water-retention capacity and water-absorption capacity under load and also gives consideration to safety, such as having a reduced water-soluble substance, the water-absorbent resin 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,其特征在于加入由下式通式(1)代表的氧杂环丁烷化合物:
其中 R1 是具有 1 至 6 个碳原子的烷基;R2 是具有 1 至 6 个碳原子的烷二基;X 是含有至少一个从羰基、磷酰基和磺酰基组成的组中选出的基团的原子基团;以及一种可通过上述方法获得的吸水性树脂,其特征在于该吸水性树脂对生理盐水的保水能力为 30 g/g 或以上,在 2.07 kPa 下生理盐水的吸水能力为 28 mL/g 或以上,水溶性物质的质量分数为 20% 或以下。由于通过本发明的方法获得的吸水性树脂在保水能力和负载下吸水能力等各种性能方面都很出色,而且还考虑到了安全性,例如具有较低的水溶性物质,因此该吸水性树脂可优先用于卫生材料,例如一次性尿布、失禁垫和卫生巾,特别是一次性尿布。