Granted Patent B2

US 12,246,303 · App. 17/298,822 · Granted Mar 11, 2025

Inventor: Takashi Ito (Himeji, JP)

Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.

B01J20/267A61F13/539B01J20/28004B01J20/28016G01N21/59A61F2013/530569A61F2013/530591A61F2013/530729A61F2013/53908A61L15/24

Abstract

Claims (23)

1. Water-absorbing resin particles comprising:

a crosslinked polymer having a monomer unit derived from an ethylenically unsaturated monomer comprising at least one compound selected from the group consisting of (meth)acrylic acid and a salt thereof,

wherein a proportion of a (meth)acrylic acid and a salt thereof is 70 to 100 mol % with respect to a total amount of monomers in the crosslinked polymer,

a light transmittance at a wavelength of 425 nm when the water-absorbing resin particles are swollen 30 times with a physiological saline solution is 20% or more, and

a water retention capacity for the physiological saline solution is 30 to 55 g/g.

2. An absorbent article comprising:

a liquid-impermeable sheet;

an absorbent; and

a liquid-permeable sheet,

wherein the liquid-impermeable sheet, the absorbent, and the liquid-permeable sheet are disposed in this order, and

the absorbent comprises the water-absorbing resin particles according to claim 1 .

3. The absorbent article according to claim 2 , wherein the liquid-permeable sheet comprises thermal bonded non-woven fabrics, air through non-woven fabrics, resin bonded non-woven fabrics, spunbond non-woven fabrics, melt-blown non-woven fabrics, airlaid non-woven fabrics, spunlace non-woven fabrics, point-bonded non-woven fabrics, or a laminate of two or more of non-woven fabrics selected from these non-woven fabrics.

4. The absorbent article according to claim 2 , wherein the absorbent further comprises a fibrous material.

5. The absorbent article according to claim 2 , further comprising a core wrap that covers at least a surface side of the absorbent in contact with the liquid-permeable sheet.

6. The absorbent article according to claim 5 , wherein the core wrap is adhered to the liquid-permeable sheet.

7. The absorbent article according to claim 2 ,

wherein the absorbent is disposed to be in contact with the liquid-permeable sheet, and

the absorbent is adhered to the liquid-permeable sheet.

8. The absorbent article according to claim 2 , wherein a water absorption speed of the water-absorbing resin particles for a physiological saline solution is 30 to 80 seconds.

9. The water-absorbing resin particles according to claim 1 ,

wherein the light transmittance at a wavelength of 425 nm when the water-absorbing resin particles are swollen 30 times with a physiological saline solution is 50% or more.

10. The water-absorbing resin particles according to claim 1 ,

wherein a median particle size of the water-absorbing resin particles is 250 to 850 μm.

Assignments (1)

Priority Claims (4)

Continuity (1)

References Cited (73)