Superabsorbent particles have a median size of from about 50 to about 2,000 micrometers and contain a porous network that includes a plurality of nanopores having an average cross-sectional dimension of from about 10 to about 500 nanometers, wherein the superabsorbent particles exhibit a Vortex Time of about 80 seconds or less and a free swell gel bed permeability (GBP) of 5 darcys or more, of 10 darcys or more, of 20 darcys or more, of 30 darcys or more, of 60 darcys or more, or of 90 darcys or more. A method for forming such superabsorbent particles includes forming a composition that contains a superabsorbent polymer and a solvent system; contacting the composition with a non-solvent system to initiate formation of the porous network through phase inversion; removing non-solvent from the composition; and surface crosslinking the superabsorbent particles.

Described herein are absorbent composites containing embossed superabsorbent materials and methods of manufacturing absorbent composites containing embossed superabsorbent materials. The absorbent composites have significantly improved rates of intake. Compositions and methods described herein are useful in a variety of absorbent products.

An absorbent article wherein an upper auxiliary layer of an absorber includes a super absorbent nonwoven fabric having a surface exposed on an uppermost surface of the absorber and having a Klemm water absorptiveness of 100 mm or more, and first super absorbent polymer particles adjacent to a back surface of the super absorbent nonwoven fabric; a main absorption layer of the absorber is a cell absorbing sheet having second super absorbent polymer particles contained in cells arranged at intervals; the first super absorbent polymer particles are fixed to an upper surface of an upper sheet of the main absorption layer with an adhesive; the upper sheet is formed of a short fiber nonwoven fabric and has a larger amount of fuzz on the upper surface thereof than a lower surface thereof; and the adhesive is applied in an intermittent pattern at an application rate of 4 to 10 g/m.sup.2.

An absorbent core suitable for use in an absorbent article comprising: a first absorbent layer, the first absorbent layer comprising a first substrate, and a layer of cross-linked cellulose fibers deposited on the first substrate, a second absorbent layer, the second absorbent layer comprising a second substrate, a layer of superabsorbent polymer particles deposited on the second substrate and a fibrous layer of thermoplastic adhesive material covering the layer of superabsorbent polymer particles. The first and second absorbent layers being combined together such that at least a portion of the fibrous layer of thermoplastic adhesive material contacts at least a portion of the layer of cross-linked cellulose fibers of the first absorbent layer.

Disclosed are water-absorbent resin particles including: a crosslinked polymer having a structural unit derived from an ethylenically unsaturated monomer including at least one compound selected from the group consisting of (meth)acrylic acid and a salt thereof, in which a proportion of (meth)acrylic acid and a salt thereof is 70 to 100 mol % with respect to a total amount of monomer units in the crosslinked polymer, and in a moisture retention test performed under reduced pressure, a moisture retention rate after 6 hours is 55% by mass or more, and a water retention capacity for a physiological saline solution is 32 to 70 g/g.

The present invention provides for an absorbent article that includes a topsheet, backsheet and absorbent core. The absorbent core includes a fibrous material and a particulate superabsorbent polymer composition. The superabsorbent polymer composition exhibits advantageous performance of absorption rate, surface tension, bulk density, centrifuge retention capacity, absorbency under load, gel bed permeability and particle size.

Disclosed is water-absorbent resin particles including a crosslinked polymer having a structural unit derived from an ethylenically unsaturated monomer including at least one compound selected from the group consisting of (meth)acrylic acid and a salt thereof, in which a proportion of (meth)acrylic acid and a salt thereof is 70 to 100 mol % with respect to a total amount of monomer units in the crosslinked polymer, and a dissolved content in an aqueous solution of 0.9% by mass NaCl at 25° C. is 10% by mass or more and 25% by mass or less, and a dissolved content in an aqueous solution of 0.9% by mass NaCl at 40° C. is 1.4% by mass or more and 30% by mass or less, where the dissolved contents are measured by a specific method.

Disclosed is water-absorbent resin particles including: a crosslinked polymer having a monomer unit derived from an ethylenically unsaturated monomer including at least one compound selected from the group consisting of (meth)acrylic acid and a salt thereof, in which a proportion of (meth)acrylic acid and a salt thereof is 70 to 100 mol % with respect to a total amount of monomer units in the crosslinked polymer, an artificial urine permeation speed when the water-absorbent resin particles are swollen tenfold is 1.0 g/min or more and 35.0 g/min or less, a water retention capacity for a physiological saline solution is 32 to 60 g/g, and a contact angle measured in a test performed in the order of i) and ii) is 70 degrees or smaller.

An absorber 10 contains water-absorbent resin particles 10a and a fibrous substance, a medium particle diameter of the water-absorbent resin particles 10a is 250 to 600 μm, the water-absorbent resin particles 10a contain small-diameter particles having a particle diameter of 180 μm or less, and a falloff rate of a mixture of the small-diameter particles and the fibrous substance when the mixture is subjected to shaking treatment for 10 minutes is 20% by mass or less.

An absorbent article 100 includes an absorber 10, the absorber 10 contains water-absorbent resin particles 10a, and a swelling height of the water-absorbent resin particles 10a measured by the following procedures (1) to (6) is 10 mm or less.

(1) A container having a recess having a bottom area of 50 cm.sup.2 is disposed in a state where the recess is open in a vertical direction.

(2) 1.00 g of water-absorbent resin particles are disposed in the recess.

(3) A non woven fabric is disposed on the water-absorbent resin particles in the recess.

(4) A weight having a mass of 90 g is disposed on the non-woven fabric.

(5) Physiological saline is supplied into the recess.

(6) A movement distance in a vertical direction of the weight when 300 seconds have passed from the start of swelling of the water-absorbent resin particles is measured as the swelling height.