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US 12,161,537 B2Granted
Water-absorbent resin particles, water-absorbent article, and method for manufacturing same
AssigneeSumitomo Seika Chemicals Co., Ltd.
InventorHiroki Yabuguchi
Life of this patent
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Abstract
Water-absorbing resin particles, in which a permeation and spreading index represented by Formula (1) is 10.0 or higher, and a water absorption capacity for a physiological saline solution is 50.0 g/g or more, are disclosed. Formula (1): Permeation and spreading index=value of non-pressurization DW after 1 minute (mL/g)+artificial urine permeation speed when water-absorbing resin particles are swollen 10 times (g/min) (1).
Claims16
Water-absorbing resin particles comprising:
- a polymer particle comprising 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;
- and
- a plurality of inorganic particles disposed on a surface of the polymer particle,
- wherein a proportion of a (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,
- a permeation and spreading index represented by Formula (1) is 10.0 or higher, and
- a water absorption capacity for a physiological saline solution is 50.0 g/g or more,
- Formula (1):
- permeation and spreading index=value of non-pressurization demand wettability (DW) after 1 minute (mL/g)+artificial urine permeation speed when water-absorbing resin particles are swollen 10 times (g/min) (1).
5 more elements
A method for manufacturing an absorbent article, the method comprising:
- sorting out water-absorbing resin particles in which a permeation and spreading index represented by Formula (1) is 10.0 or higher, and a water absorption capacity for a physiological saline solution is 50.0 g/g or more;
- and
- disposing an absorbent containing the sorted water-absorbing resin particles between a liquid-impermeable sheet and a liquid-permeable sheet,
- wherein the water-absorbing resin particles comprise
- a polymer particle containing 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, and
- a plurality of inorganic particles disposed on a surface of the polymer particle, and
- a proportion of a (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,
- Formula (1):
- permeation and spreading index=value of non-pressurization DW after 1 minute (mL/g)+artificial urine permeation speed when water-absorbing resin particles are swollen 10 times (g/min) (1).
6 more elements
Dependencies are inferred from the claim text.