	US 11,986,798 B2
	Permeable superabsorbent and process for production thereof
Christophe Bauduin, Ludwigshafen (DE); and Thomas Daniel, Ludwigshafen (DE)
Assigned to BASF SE, Ludwigshafen (DE)
Appl. No. 17/043,764
Filed by BASF SE, Ludwigshafen (DE)
PCT Filed Apr. 1, 2019, PCT No. PCT/EP2019/058165 § 371(c)(1), (2) Date Sep. 30, 2020, PCT Pub. No. WO2019/197194, PCT Pub. Date Oct. 17, 2019.
Claims priority of application No. 18166564 (EP), filed on Apr. 10, 2018.
Prior Publication US 2021/0016247 A1, Jan. 21, 2021
Int. Cl. B01J 20/26 (2006.01); A61L 15/18 (2006.01); A61L 15/24 (2006.01); A61L 15/54 (2006.01); A61L 15/60 (2006.01); B01J 20/08 (2006.01); B01J 20/30 (2006.01); C08F 220/06 (2006.01)

CPC B01J 20/267 (2013.01) [A61L 15/18 (2013.01); A61L 15/24 (2013.01); A61L 15/54 (2013.01); A61L 15/60 (2013.01); B01J 20/08 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01); C08F 220/06 (2013.01); C08F 2800/10 (2013.01); C08F 2810/20 (2013.01)]

8 Claims

1. A process for producing a superabsorbent, comprising

polymerizing an aqueous monomer solution comprising

a) at least one ethylenically unsaturated monomer which bears an acid group and optionally is at least partly in salt form,

b) at least one crosslinker,

c) at least one initiator,

d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a), and

e) optionally one or more water-soluble polymer;

drying a resulting polymer,

optionally grinding the dried polymer and sieving the ground polymer,

optionally surface postcrosslinking the dried and optionally ground and sieved polymer,

wherein, after drying, grinding, or sieving, and, if surface postcrosslinking is conducted, during or after the surface postcrosslinking, adding an x-ray-amorphous aluminum hydroxide powder.