US 11,654,416 B2
Method for preparing super-absorbent polymer
Sung Soo Park, Daejeon (KR); Gi Cheul Kim, Daejeon (KR); Ju Eun Kim, Daejeon (KR); Hyeon Choi, Daejeon (KR); Hyo Sook Joo, Daejeon (KR); Sung Hyun Park, Daejeon (KR); Hee Jung Choi, Daejeon (KR); and Ki Youl Yoon, Daejeon (KR)
Assigned to LG Chem, Ltd.
Filed by LG Chem, Ltd., Seoul (KR)
Filed on Mar. 5, 2021, as Appl. No. 17/193,601.
Application 17/193,601 is a division of application No. 15/524,697, granted, now 10,981,146, previously published as PCT/KR2015/014428, filed on Dec. 29, 2015.
Claims priority of application No. 10-2015-0011037 (KR), filed on Jan. 23, 2015; and application No. 10-2015-0187758 (KR), filed on Dec. 28, 2015.
Prior Publication US 2021/0187478 A1, Jun. 24, 2021
Int. Cl. B01J 20/26 (2006.01); C08J 3/075 (2006.01); C08J 3/12 (2006.01); C08K 9/06 (2006.01); C08J 3/24 (2006.01); B01J 20/28 (2006.01); B01J 20/10 (2006.01); B01J 20/30 (2006.01); B01J 20/32 (2006.01); A61F 13/53 (2006.01)
CPC B01J 20/267 (2013.01) [B01J 20/103 (2013.01); B01J 20/265 (2013.01); B01J 20/28004 (2013.01); B01J 20/28007 (2013.01); B01J 20/28011 (2013.01); B01J 20/28059 (2013.01); B01J 20/28061 (2013.01); B01J 20/28064 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01); B01J 20/3204 (2013.01); B01J 20/3282 (2013.01); C08J 3/075 (2013.01); C08J 3/12 (2013.01); C08J 3/24 (2013.01); C08J 3/245 (2013.01); C08K 9/06 (2013.01); A61F 2013/530481 (2013.01); C08J 2300/14 (2013.01)] 3 Claims
 
1. A method of preparing the superabsorbent polymer, the method comprising:
polymerizing water-soluble ethylene-based unsaturated monomers in the presence of an internal crosslinking agent to form a hydrogel polymer, wherein the water-soluble ethylene-based unsaturated monomers have acidic groups which are at least partially neutralized;
drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder; and
crosslinking the surface of the base polymer powder in the presence of a surface crosslinking agent and surface-modified inorganic particles including surfaces modified with one or more functional groups selected from the group consisting of an epoxy group, a hydroxy group, an isocyanate group, and an amine group to form a surface crosslinking layer.