	US 12,350,647 B2
	Method for producing superabsorbent particles
Monica Haag, Ludwigshafen (DE); and Stefan Gierescher, Ludwigshafen (DE)
Assigned to BASF SE, Ludwigshafen (DE)
Appl. No. 17/419,333
Filed by BASF SE, Ludwigshafen (DE)
PCT Filed Jan. 13, 2020, PCT No. PCT/EP2020/050627 § 371(c)(1), (2) Date Jun. 29, 2021, PCT Pub. No. WO2020/151970, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 19153439 (EP), filed on Jan. 24, 2019.
Prior Publication US 2022/0080386 A1, Mar. 17, 2022
Int. Cl. B01J 20/26 (2006.01); A61L 15/22 (2006.01); A61L 15/24 (2006.01); A61L 15/42 (2006.01); A61L 15/60 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01)

CPC B01J 20/267 (2013.01) [A61L 15/225 (2013.01); A61L 15/24 (2013.01); A61L 15/425 (2013.01); A61L 15/60 (2013.01); B01J 20/262 (2013.01); B01J 20/28016 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01)]

13 Claims

1. A process for producing superabsorbent particles, comprising:

foaming an aqueous surfactant solution to form a foamed aqueous surfactant solution;

mixing the foamed aqueous surfactant solution with an aqueous monomer solution to obtain a monomer preparation, the aqueous monomer solution comprising:

a) at least one ethylenically unsaturated monomer which bears an acid group and is at least partly neutralized,

b) at least one crosslinker and

c) at least one initiator; and

polymerizing the monomer preparation, drying a resultant aqueous polymer gel, grinding, classifying and thermal surface postcrosslinking.