Nippon Shokubai Co., Ltd.

Yoshitaka Ikeuchi

Yoshifumi Adachi

Katsuyuki Wada

Shigeru Sakamoto

Hiroyuki Ikeuchi

Takahiro Kitano

Ryota Wakabayashi

Yoshihiro Shobo

Daisuke Takagi

Tsuyoshi Yorino

Daisuke Takeda

Manabu Ueda

Sachie Kitabata

To provide a disposable diaper enabling reduction in re-wet amount and having an excellent speed of incorporating liquid regardless of concentration and configuration of a water-absorbing agent in an absorbent material. A water-absorbing agent having excellent Gel Capillary Absorption (GCA) and Free Gel Bed Permeability (FGBP) is obtained by crushing a crosslinked hydrogel polymer obtained in a polymerization step to have a specific weight average particle diameter while fluid retention capacity and a surface tension of a water-absorbing agent are adjusted in a specific range, drying the crushed crosslinked hydrogel polymer, and then adding a liquid permeability enhancer thereto during surface crosslinking or after surface crosslinking.

Poly (meth) acrylic acid (salt)-based particulate water-absorbing agent and production method therefor

A water absorbent resin (water absorbing agent) and method for producing it are provided which improve, in a water absorbent article (in particular, a diaper) including a water absorbent resin as a water absorbing agent, the absolute absorption amount (g), liquid absorbing times (in particular, liquid absorbing times at the second instance and later), re-wet (g), and diffusion distance (%) of the water absorbent article. A particulate water absorbing agent of the present invention has a CRC, a proportion of particles with sizes of 600 &#x3bc;m to 150 &#x3bc;m as defined through a standard-sieve classification, an SST, and the value of the difference between an FST and the SST each within a predetermined range.

Particulate water absorbing agent and water absorbent article

A low cost, a disposable diaper is provided that presents no difficulties in disposable diaper manufacture in humid climates, and that has a minimal amount of flowback, and rapid absorption time. A particulate water-absorbing agent is provided having as the principal component a poly (meth)acrylic acid (salt)-based water absorbing resin, wherein the water-absorbing agent has a particle size distribution of a weight average particle diameter of 300 to 500 &#x3bc;m, a blocking ratio after moisture absorption when left for one hour at 25&#xb0; C. and 90% relative humidity of 20% or less, a surface tension of 60 mN/m or more, and a gel capillary absorption (GCA) of 28.0 g/g or more.

Poly(meth)acrylic acid (salt)-based particulate absorbent

Particulate water absorbing agent and method for manufacturing same

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Himeji, Japan

Yoshitaka Ikeuchi