申请人:Higashimoto Naonori
公开号:US20080027180A1
公开(公告)日:2008-01-31
A water-absorbing resin has a polymer molecular chain in which 50 mol % or more of repeating units in the chain are carboxy group-containing units, wherein the carboxy group neutralization ratio in the central part of the resin is 60 mol % or more and the carboxy group neutralization ratio on the external surface of the resin is 50 mol % or less. A method for producing the water-absorbing resin comprises polymerizing a monomer solution to form a polymer, drying the resulting polymer, and heat-treating the dried polymer, wherein the monomer solution contains a mixture comprising an alkali metal salt of an unsaturated carboxylic acid and an ammonium salt thereof, the percentage of the ammonium salt being more than 50 mol % of the mixture, and further contains a condensation crosslinking agent.
一种吸水树脂具有聚合物分子链,其中链中重复单元的50摩尔%或更多为含羧基的单元,树脂中心部分的羧基中和比率为60摩尔%或更高,树脂外表面的羧基中和比率为50摩尔%或更低。制备该吸水树脂的方法包括聚合单体溶液以形成聚合物,干燥所得的聚合物,并热处理干燥后的聚合物,其中单体溶液包含混合物,其中包含不饱和羧酸的碱金属盐和其铵盐的混合物,铵盐的百分比超过混合物的50摩尔%,并且还包含缩聚交联剂。