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    • 1. 发明申请
    • 粒子状吸水剤及びその製造方法並びに吸水性物品
    • 颗粒吸水剂及其生产方法和吸水性物品
    • WO2005075070A1
    • 2005-08-18
    • PCT/JP2005/001689
    • 2005-02-04
    • 株式会社日本触媒大六 頼道足立 芳史野木 幸三井上 博樹和田 克之入江 好夫
    • 大六 頼道足立 芳史野木 幸三井上 博樹和田 克之入江 好夫
    • B01J20/26
    • C08J3/243A61L15/60B01J20/26B01J20/267B01J2220/68C08J2300/102
    • A particulate water absorbing agent being prepared by the surface crosslinking treatment of a water absorbing resin having a crosslinked structure, characterized in that (i) a mass average particle diameter (D50) is 200 to 600 mum and particles having a diameter of not less than 150 and less than 850 mum account for 95 to 100 wt % of the total particles, (ii) a logarithmic standard deviation (sigmazeta) of its particle size distribution is 0.25 to 0.45, (iii) a degree of compression is 0 to 18 %, and (iv) a surface tension of a supernatant liquid being obtained four minutes after the dispersion of 0.5 g of said particulate water absorbing agent into 50 ml of a physiological saline solution at 20°C is 55 mN/m or more. The particulate water absorbing agent exhibits high fluidity in a dry state, while retaining high absorbing capability, and can be free from blocking, caking and the sticking to an apparatus or the like, and, when the absorbing agent is contacted with a liquid to be absorbed, the liquid is less prone to reduction of the surface tension, and further, the absorbing agent exhibits enhanced fluidity and bulk density without detriment to absorbing characteristics.
    • 通过表面交联处理具有交联结构的吸水树脂制备的颗粒状吸水剂,其特征在于(i)质量平均粒径(D50)为200-600μm,直径不小于 150和小于850微米占总颗粒的95至100重量%,(ii)其粒度分布的对数标准偏差(sigmazeta)为0.25至0.45,(iii)压缩度为0至18% ,和(iv)在20℃下将0.5g所述颗粒状吸水剂分散在50ml生理盐水中之后四分钟获得的上清液的表面张力为55mN / m以上。 颗粒状吸水剂在干燥状态下表现出高的流动性,同时保持高的吸收能力,并且可以没有阻塞,结块和粘附到装置等上,并且当吸收剂与液体接触时 吸收液体不容易降低表面张力,此外,吸收剂表现出增强的流动性和体积密度,而不损害吸收特性。