Water-absorbent resin and absorbent article
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorsMikito Chiba, Yuichi Onoda
Life of this patent
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Abstract
A water-absorbent resin that exhibits a high liquid-retention capacity under a load and a small amount of re-wet, even when it is used in an absorbent material having a low proportion of hydrophilic fibers. The water-absorbent resin includes a polymer of a water-soluble ethylenically unsaturated monomer, wherein when a cross-sectional image of the water-absorbent resin is observed using X-ray computed tomography, the water-absorbent resin has cavity area percentage in the cross-sectional image of 10% or less.
Claims5
A water-absorbent resin comprising a polymer of a water-soluble ethylenically unsaturated monomer, wherein when a cross-sectional image of the water-absorbent resin is observed using X-ray computed tomography, the water-absorbent resin has a ratio of area of cavity portions (cavity area ratio) in the cross-sectional image of 10% or less, as calculated according to Equation (I):
- cavity area ratio[%]={total cross-sectional area of cavity portions(B)in the water-absorbent resin/(total cross-sectional area of resin portions(A)in the water-absorbent resin+total cross-sectional area of cavity portions(B)in the water-absorbent resin))×100 (I),
- wherein the water-absorbent resin has a substantially spherical shape or a shape in which particles having a substantially spherical shape are aggregated.
Dependencies are inferred from the claim text.