	US 12,246,303 B2
	Water-absorbing resin particles and absorbent article
Takashi Ito, Himeji (JP)
Assigned to SUMITOMO SEIKA CHEMICALS CO., LTD., Hyogo (JP)
Appl. No. 17/298,822
Filed by SUMITOMO SEIKA CHEMICALS CO., LTD., Hyogo (JP)
PCT Filed Dec. 12, 2019, PCT No. PCT/JP2019/048798 § 371(c)(1), (2) Date Jun. 1, 2021, PCT Pub. No. WO2020/122203, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. 2018-232848 (JP), filed on Dec. 12, 2018; application No. 2019-014517 (JP), filed on Jan. 30, 2019; application No. 2019-055262 (JP), filed on Mar. 22, 2019; and application No. 2019-055311 (JP), filed on Mar. 22, 2019.
Prior Publication US 2022/0016597 A1, Jan. 20, 2022
Int. Cl. B01J 20/26 (2006.01); A61F 13/539 (2006.01); B01J 20/28 (2006.01); G01N 21/59 (2006.01); A61F 13/53 (2006.01); A61L 15/24 (2006.01)

CPC B01J 20/267 (2013.01) [A61F 13/539 (2013.01); B01J 20/28004 (2013.01); B01J 20/28016 (2013.01); G01N 21/59 (2013.01); A61F 2013/530569 (2013.01); A61F 2013/530591 (2013.01); A61F 2013/530729 (2013.01); A61F 2013/53908 (2013.01); A61L 15/24 (2013.01)]

10 Claims

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.