	US 12,338,331 B2
	Method for preparing superabsorbent polymer
Se Yeol Park, Daejeon (KR); Gicheul Kim, Daejeon (KR); Yun Kyung Do, Daejeon (KR); and Sangwon Han, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/630,999
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Oct. 8, 2020, PCT No. PCT/KR2020/013748 § 371(c)(1), (2) Date Jan. 28, 2022, PCT Pub. No. WO2021/071291, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 10-2019-0124760 (KR), filed on Oct. 8, 2019; and application No. 10-2020-0129974 (KR), filed on Oct. 8, 2020.
Prior Publication US 2022/0315715 A1, Oct. 6, 2022
Int. Cl. C08J 3/24 (2006.01); C08K 5/09 (2006.01); C08L 33/08 (2006.01)

CPC C08J 3/24 (2013.01) [C08K 5/09 (2013.01); C08L 33/08 (2013.01)]

8 Claims

1. A method for preparing superabsorbent polymer, comprising:

preparing a monomer composition comprising acrylic acid based monomers having acid groups of which at least a part are neutralized, an internal crosslinking agent, and a polymerization initiator;

conducting crosslinking polymerization of the monomer composition to form hydrogel polymer;

drying and grinding the hydrogel polymer, and classifying into base resin normal particles having particle diameters greater than 150 μm and 850 μm or less, and fine powders having particle diameters of 150 μm or less; and

mixing the fine powders with stearic acid or salts thereof to prepare fine powder reassembly.