Nippon Shokubai Co., Ltd.

Bando Chemical Industries, Inc.

Daisuke Takagi

Kazushi Torii

Shigeru Sakamoto

Yoshifumi Adachi

Ryota Wakabayashi

Yoshihiro Shobo

Toshikazu Taura

Kazuo Saito

Yoshitaka Ikeuchi

Tsuyoshi Yorino

Daisuke Takeda

Tomoki Iwanaga

Sachie Kitabata

Hiroyuki Ikeuchi

Taku Iwamura

Takahiro Kitano

Taishi Kobayashi

Taku Fujimoto

Hiroki Naito

Fumihiro Mukai

Mariko Tamaki

Hiroki Kawada

Yasuhisa Nakajima

Hiroyuki Goto

Yuika Noda

Yuichiro Horimoto

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 grinding material includes a base sheet and a grinding layer overlaid on a front face side of the base sheet and including abrasive grains and a binder for the abrasive grains. The grinding layer includes the abrasive grains of a plurality of types. Of the abrasive grains of the plurality of types, provided that first abrasive grains have the largest average diameter and second abrasive grains have the second largest average diameter, the percentage of the average diameter of the second abrasive grains with respect to that of the first abrasive grains is 5-70%. The total content of the abrasive grains in the grinding layer is preferably 50-85% by volume. The content of the first abrasive grains in the grinding layer is preferably 1-25% by volume. The first abrasive grains are preferably diamond abrasive grains and the second abrasive grains are preferably alumina abrasive grains.

Grinding material

Provided are a water-absorbing resin having more excellent balance of fluid retention capacity, liquid permeability, and low dustiness and a novel measurement method which enables evaluation of excellent physical properties of the water-absorbing resin. A method for measuring an absorption speed of a particulate water-absorbing agent is a method including the step of applying pressure to a portion of a bottom surface of a measurement container () by use of a flat plate () in a state in which part or whole of the particulate water-absorbing agent () is fixed on the bottom surface of the measurement container (), the bottom surface being surrounded by a frame, introducing an aqueous solution through a liquid injection inlet () with which the flat plate () is equipped, and then measuring the amount of time elapsed until an end of absorption of the introduced aqueous solution by the particulate water-absorbing agent ().

Measurement method for properties of particulate absorbent agent, and particulate absorbent agent

The present invention provides an optically clear adhesive sheet that has excellent flexibility and prevents delay bubbles in high temperature and high humidity environments. The optically clear adhesive sheet of the present invention sequentially includes a first surface-adhesive layer, an intermediate adhesive layer, and a second surface-adhesive layer. The first surface-adhesive layer and the second surface-adhesive layer each have a higher storage elastic modulus at 85&#xb0; C. than the intermediate adhesive layer. The first surface-adhesive layer and the second surface-adhesive layer each have a storage elastic modulus at 85&#xb0; C. of 3.0&#xd7;10Pa or higher and 30.0&#xd7;10Pa or lower. The intermediate adhesive layer has a storage elastic modulus at 85&#xb0; C. of 1.0&#xd7;10Pa or higher and 15.0&#xd7;10Pa or lower. The intermediate adhesive layer contains polyurethane.

Transparent adhesive optical sheet, laminate and bonded structure

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

It is an object of the present invention to provide an abrasive material which enables: processing efficiency and finished planarity of a substrate material to be simultaneously improved at a high level; polishing costs to be reduced; and a difficult-to-process substrate composed of sapphire or silicon carbide to be polished efficiently and precisely. An abrasive material comprises a substrate and an abrasive layer laminated on a front face side of the substrate, wherein the abrasive layer includes a binder containing an inorganic substance as a principal component, and abrasive particles dispersed in the binder, wherein a front face of the abrasive layer comprises a plurality of regions provided through dividing by grooves, and wherein a maximum peak height (Rp) on the front face of the abrasive layer is no less than 2.5 &#x3bc;m and no greater than 70 &#x3bc;m.

Abrasive material and production method of abrasive material

Growing community of inventors

Hyogo, Japan

Daisuke Takagi