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AssigneeNippon Shokubai Co., Ltd.
InventorsKinya Nagasuna, Kenji Kadonaga, Akiko Mitsuhashi, Motohiro Imura
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The present invention provides: an absorbent structure and an absorbent article, which are excellent in both liquid diffusion ability and liquid storage ability, and which are excellent in the dry feeling and the amount of wet back of the aqueous liquid, and which can realize the thinning and lightening more; and a water-absorbent resin fitly usable for the above absorbent structure and absorbent article. The absorbent structure, according to the present invention, comprises a liquid-diffusing member and a water-absorbent resin, with the absorbent structure being characterized in that when the capillary absorption index of the liquid-diffusing member at a height of 40 cm is referred to as A (A≧0.10), the capillary absorption index B of the water-absorbent resin at a height of 40 cm satisfies the following equation: B/A≧0.7 (equation 1).
An absorbent structure, which comprises a liquid-diffusing member and a water-absorbent resin, with the absorbent structure being characterized in that when the capillary absorption index of the liquid-diffusing member at a height of 40 cm is referred to as A (A≧0.10), the capillary absorption index B of the water-absorbent resin at a height of 40 cm satisfies the following equation:
An absorbent structure, which comprises a liquid-diffusing member and a water-absorbent resin, with the absorbent structure being characterized in that when the capillary absorption capacity of the liquid-diffusing member at a height of 40 cm is referred to as C (C≧2.0 (g/g)), the capillary absorption capacity D of the water-absorbent resin at a height of 40 cm satisfies the following equation:
An absorbent structure, which comprises a liquid-diffusing member and a liquid-storing member, with the absorbent structure being characterized in that:
An absorbent structure, which comprises a liquid-diffusing member and a liquid-storing member, with the absorbent structure being characterized in that:
An absorbent structure, which comprises a liquid-diffusing member and a water-absorbent resin including a crosslinked poly(acrylic acid (salt)) polymer in a major proportion, with the absorbent structure being characterized in that:
An absorbent structure, which comprises a liquid-acquiring member and a water-absorbent resin layer having a scattering amount of not smaller than 250 g/m2 of the water-absorbent resin, with the absorbent structure being characterized in that when the capillary absorption index of the liquid-acquiring member at a height of 40 cm is referred to as E (E<0.1), the capillary absorption index B of the. water-absorbent resin at a height of 40 cm satisfies the following equation:
An absorbent structure, which comprises a liquid-acquiring member and a water-absorbent resin layer having a scattering amount of not smaller than 250 g/m2 of the water-absorbent resin, with the absorbent structure being characterized in that when the capillary absorption index of the liquid-acquiring member at a height of 40 cm is referred to as E (E<0.1), the capillary absorption index F of the water-absorbent resin layer at a height of 40 cm satisfies the following equation:
An absorbent structure, which comprises a liquid-acquiring member and a water-absorbent resin layer having a scattering amount of not smaller than 250 g/m2 of the water-absorbent resin, with the absorbent structure being characterized in that:
An absorbent structure, which comprises a liquid-acquiring member and a water-absorbent resin layer having a scattering amount of not smaller than 250 g/m2 of the water-absorbent resin, with the absorbent structure being characterized in that:
Water-absorbent resin particles, which are obtained by a process including the step of granulating a water-absorbent resin having a weight-average particle diameter of 50 to 300 μm and displaying a space ratio of 30 to 50% and an average space radius of 80 to 150 μm as to spaces between particles when saturation-swollen with a physiological saline (a 0.9 weight % aqueous NaCl solution) without load;
Water-absorbent resin particles, which comprise a crosslinked poly(acrylic acid (salt)) polymer in a major proportion and display a capillary absorption capacity D of not less than 25 (g/g) at a height of 40 cm.
A production process for water-absorbent resin particles, which is characterized by comprising the step of adding a dispersion of water-dispersible fine particles to a water-absorbent resin, thereby increasing the weight-average particle diameter of the water-absorbent resin by not less than 50%, wherein the water-absorbent resin has a weight-average particle diameter of 50 to 300 μm and displays a space ratio of 30 to 50% and an average space radius of 80 to 150 μm as to spaces between particles when saturation-swollen with a physiological saline (a 0.9 weight % aqueous NaCl solution) without load.
A water-absorbent resin, which comprises a crosslinked poly(acrylic acid (salt)) polymer in a major proportion and displays a capillary absorption capacity D of not less than 25 (g/g) at a height of 40 cm.
An evaluation method for a water-absorbent resin, which comprises the step of measuring an absorption capacity for a liquid as absorbed by the water-absorbent resin within a predetermined time in a state where the liquid-absorbing position height H1 is in a position higher than the liquid surface height H2 in a liquid-storing receptacle.
Dependencies are inferred from the claim text.