Sumitomo Seika Chemicals Co., Ltd.

Hideki Matsushita

Masayoshi Handa

Junichi Takatori

Jun Sakata

Tetsuhiro Hinayama

Kenji Tanimura

Takahiro Imai

Haruka Inaba

Hidenobu Kakimoto

Kana Kudo

Junichi Maruo

Ryusuke Umeza

Provided is a method for producing water-absorbent resin particles suitable for use in absorbent article and the like, the water-absorbent resin particles having better water-absorbent performance, a suitable particle size, and a narrow particle-size distribution. A method for producing water-absorbent resin particles by reversed-phase suspension polymerization of a water-soluble ethylenic unsaturated monomer in a carrier fluid, wherein the method for producing water-absorbent resin particles comprises conducting the reversed-phase suspension polymerization reaction in the presence of an organic acid monoglyceride.

Method for producing water-absorbent resin particle

A water-absorbent sheet structure comprising a structure in which an absorbent layer containing a water-absorbent resin is sandwiched with a hydrophilic nonwoven fabric from an upper side and a lower side of the absorbent layer, characterized in that at least one side of the upper side and the lower side of the water-absorbent sheet structure is subjected to embossing, wherein a central region Wof a water-absorbent sheet structurealong a longitudinal direction of the structureis subjected to: wavy embossingcomprising one wavy embossing extending along the longitudinal direction, wherein the embossing comprises one or more discontinued segments of the embossing, and linear embossingin a direction from each of tipsof wavy forms formed by the wavy embossingtowards an edge portion contouring along the longitudinal direction of the water-absorbent sheet structure, and wherein a branched structure of embossing formed by the wavy embossingand the linear embossinghas an approximate Y-shape-form, and wherein the edge portion contouring along the longitudinal direction of the water-absorbent sheet structurecomprises non-embossing regions W, W' not subjected to embossing, extending along the longitudinal direction, and further wherein an area of the embossing provided on the water-absorbent sheet structureis from 2 to 25% of an entire area of the water-absorbent sheet structure; and an absorbent article comprising the water-absorbent sheet structure, sandwiched between a liquid-permeable sheet and a liquid-impermeable sheet. According to the present invention, some effects are exhibited that a water-absorbent sheet structure which has a fast permeation rate of a liquid and is less likely to cause liquid leakage can be provided by subjecting at least an upper side or a lower side of the water-absorbent sheet structure to a specified emboss shape even when the water-absorbent sheet structure contains very little amount of pulps.

Water-absorbent sheet structure

Growing community of inventors

Himeji, Japan

Hideki Matsushita