Nippon Shokubai Co., Ltd.

Hiroki Kawada

Kazushi Torii

Taku Iwamura

Taku Fujimoto

Yasuhisa Nakajima

Hiroyuki Ikeuchi

Yasuhisa Nakashima

Takahiro Kitano

Taishi Kobayashi

Daisuke Takagi

Koji Tachi

Mariko Tamaki

Yukihiro Kasano

Yuichiro Horimoto

Hiroyuki Goto

Makiko Masuda

Provided is a water-absorbing agent that causes no or little fluctuation of feed rate when fed with use of a feeder. A water-absorbing agent containing a water-absorbing resin as a main component, the water-absorbing agent satisfying the following (a) and (b): (a) K-index is 70 or more; and (b) Moisture absorption blocking ratio, after 30 minutes of standing at a temperature of 25&#xb0; C. and a relative humidity of 80% RH, is 70 weight % or less, the K-index being defined by the following equation: K-index=100&#x2212;(&#x2212;438+3.6&#xd7;angle of repose+3.5&#xd7;angle of difference+7.9&#xd7;compressibility rate+290&#xd7;bulk density (EDANA method)).

Absorption agent and absorbent article

To provide a water-absorbing resin composition having both a high centrifuge retention capacity (CRC) and a sufficient urine resistance and a method for producing such a water-absorbing resin composition, an aspect of the present invention is a water-absorbing resin composition having the following properties: (1) A centrifuge retention capacity (CRC) being not less than 35 g/g; (2) A post-degradation-test one-hour eluted soluble component being not more than 19% by mass; (3) An absorbency against pressure 0.7 psi (AAP0.7) being not less than 10 g/g; and (4) A content of a water-absorbing resin in dust being not more than 300 ppm with respect to a total mass of the water-absorbing resin composition.

Water-absorbing resin composition

The purpose of the present invention is to provide a particulate water absorbing agent having both a high water absorption multiplying factor and a high water absorption rate and a method for manufacturing the same. The present invention is a particulate water absorbing agent for which CRC is 30 to 50 g/g, wherein the weight average particulate diameter (D50) is 200-600 &#x3bc;m, and the DRC index given by the following formula is a specific value (for example, 43, 30, or 20) or less: DRC index=(49&#x2212;DRC5min [g/g])/(D50 [&#x3bc;m]/1000).

Particulate water absorbing agent

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Hyogo, Japan

Hiroki Kawada