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    • 47. 发明申请
    • Particulate water absorbent agent and production method thereof, and water absorbent article
    • 颗粒状吸水剂及其制造方法和吸水性物品
    • US20080269372A1
    • 2008-10-30
    • US12078802
    • 2008-04-04
    • Yorimichi DairokuYoshifumi AdachiKozo NogiHiroki InoueKatsuyuki WadaYoshio Irie
    • Yorimichi DairokuYoshifumi AdachiKozo NogiHiroki InoueKatsuyuki WadaYoshio Irie
    • C08J5/14
    • C08J3/243A61L15/60B01J20/26B01J20/267B01J2220/68C08J2300/102
    • A particulate water absorbing agent of the present invention includes a water absorbent resin, having a cross-linking structure, whose surface has been cross-linked by adding a surface treatment agent, wherein: (i) a mass average particle diameter (D50) ranges from 200 to 600 μm and 95 to 100 wt % of a particulate water absorbing agent whose particle diameter ranges from less than 850 μm to not less than 150 μm is contained with respect to 100 wt % of whole the particulate water absorbing agent, and (ii) a logarithmic standard deviation (σζ) of particle size distribution ranges from 0.25 to 0.45, and (iii) a compressibility rate defined by a following equation ranges from 0 to 18%, and (iv) a surface tension of a supernatant liquid obtained in 4 minutes after dispersing 0.5 g of the particulate water absorbing agent in 50 ml of physiological saline whose temperature is 20° C. is 55 mN/m or more, the compressibility rate (%)=(P−A)/P×100 where P represents a tapped bulk density of the particulate water absorbing agent and A represents a loose bulk density of the particulate water absorbing agent.
    • 本发明的颗粒状吸水剂包括具有交联结构的吸水性树脂,其表面通过添加表面处理剂进行交联,其中:(i)质量平均粒径(D50)范围 相对于全部颗粒状吸水剂的100重量%,含有200〜600μm,95〜100wt%粒径范围在850μm〜150μm以下的颗粒状吸水剂,( ii)粒度分布的对数标准偏差(sigmazeta)范围为0.25〜0.45,(iii)由下式表示的压缩率为0〜18%,(iv)得到的上清液的表面张力 在将0.5g颗粒状吸水剂分散在温度为20℃的50ml生理盐水中的4分钟内,在&lt;&lt;直线式说明书=“在线式”末端 =“铅”?>压缩性 y率(%)=(PA)/ P×100 <?在线公式描述=“在线公式”end =“tail”?>其中P表示颗粒状吸水剂的抽头堆积密度,A表示 颗粒状吸水剂的松散堆积密度。