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    • 3. 发明申请
    • WATER ABSORBING AGENT, WATER ABSORBING ARTICLE AND METHOD FOR PRODUCTION OF WATER ABSORBING AGENT
    • 吸水剂,吸水剂及其吸水剂的生产方法
    • WO2006088115A1
    • 2006-08-24
    • PCT/JP2006/302782
    • 2006-02-10
    • NIPPON SHOKUBAI CO., LTD.KIMURA, KazukiFUJINO, Shin-ichiWADA, KatsuyukiISHIZAKI, Kunihiko
    • KIMURA, KazukiFUJINO, Shin-ichiWADA, KatsuyukiISHIZAKI, Kunihiko
    • C08J3/12
    • A61L15/60B01J20/26B01J20/264B01J20/267B01J20/28004B01J20/2803B01J20/28047B01J20/30B01J20/3028B01J2220/68C08J3/245C08J2300/14Y10T428/2982Y10T428/2991Y10T428/2998
    • An object of the present invention is to provide a water absorbing agent having a low amount of residual monomer, small variance of the amount of residual monomer among ranges of particle size distribution and favorable absorption properties, and being sanitary; an absorbing article; and a method for the production of a water absorbing agent. The water absorbing agent of the present invention has the amount of residual monomer of not higher than 500 ppm, and a residual monomer index of not greater than 0.30.The method for the production includes a first step of obtaining a hydrogel polymer by polymerizing an aqueous solution of a monomer including an unsaturated carboxylic acid and/or a salt thereof in the presence of a crosslinking agent;a second step of obtaining a water absorbent resin precursor which is in powder form and includes particles having a particle size of 300 to 850 µm and particles having a particle size of smaller than 300 µm as main components by drying said hydrogel polymer followed by pulverization and classification to adjust the particle size distribution,a third step of obtaining a water absorbent resin by heating a mixture of said water absorbent resin precursor and a surface crosslinking agent, which can form an ester bond around the surface of said water absorbent resin precursor,a fourth step of adding by spraying an aqueous solution that includes a sulfur-containing reducing agent to said water absorbent resin, and a fifth step of subjecting the mixture of the water absorbent resin and said aqueous solution to a heat treatment under an airflow of not lower than 40°C but not higher than 120°C.
    • 本发明的目的是提供一种具有少量残留单体的吸水剂,在粒度分布范围和吸收性能良好之间的残留单体量的变化小,并且是卫生的; 吸收物品 和吸水剂的制造方法。 本发明的吸水剂的残留单体的量不高于500ppm,残留单体指数不大于0.30。制备方法包括通过聚合水性聚合物获得水凝胶聚合物的第一步骤 包含不饱和羧酸和/或其盐的单体在交联剂存在下的溶液;第二步,获得粉末形式的吸水性树脂前体,并且包括粒度为300至850μm的颗粒 粒径小于300μm的颗粒作为主要组分,通过干燥所述水凝胶聚合物,然后粉碎和分级以调节粒度分布;第三步骤,通过加热所述吸水性树脂前体的混合物获得吸水性树脂 以及可在所述吸水性树脂前体的表面周围形成酯键的表面交联剂,第四步骤 通过将包含含硫还原剂的水溶液喷雾到所述吸水性树脂中而添加,第五步是在吸水性树脂和所述水溶液的混合物在不低于40°的气流下进行热处理 但不高于120℃。