公开(公告)号：EP1790668A1

公开(公告)日：2007-05-30

申请号：EP05753460.4

申请日：2005-06-22

申请人： SUMITOMO SEIKA CHEMICALS CO., LTD.

发明人： MATSUDA, Kenya, SUMITOMO SEIKA CHEMICALS CO.LTD ,  KAKIMOTO, Hidenobu, SUMITOMO SEIKA CHEM. CO. LTD ,  NAWATA, Yasuhiro, SUMITOMO SEIKA CHEMICALS CO. LTD

IPC分类号： C08F6/00

CPC分类号： C08F6/008 ,  A61L15/60

摘要： The present invention provides a process for producing a water-absorbing resin with less coloring wherein only a small amount of a polymerization inhibitor remains, and the water-absorbing resin. More particularly, the present invention provides a process for producing a water-absorbing resin, comprising polymerizing a water-soluble ethylenic unsaturated monomer and, then, drying a hydrous gel of the resulting polymer at a pressure of 5 to 90 kPa under the atmosphere having no oxygen, or having an oxygen concentration of not higher than 5% by volume. In addition, by such the process, a water-absorbing resin having Yellow Index of not more than 20 is obtained, wherein an amount of a remaining polymerization inhibitor is not more than 30 ppm.

摘要翻译： 本发明提供了一种生产吸水性树脂的方法，该吸水树脂具有较少的着色性，其中仅留下少量的聚合抑制剂和吸水树脂。 更具体地说，本发明提供一种吸水树脂的制造方法，其特征在于，使水溶性烯属不饱和单体聚合，然后在5〜90kPa的压力下，在得到的聚合物的水凝胶的干燥下， 无氧，或氧浓度不高于5％（体积）。 此外，通过该方法，得到黄色指数为20以下的吸水性树脂，其中残留聚合抑制剂的量不超过30ppm。