	US 11,814,489 B2
	Superabsorbent polymer and preparation method thereof
Hyung Ki Yoon, Daejeon (KR); Yeon Woo Hong, Daejeon (KR); Seong Beom Heo, Daejeon (KR); Dae Woo Nam, Daejeon (KR); Tae Hwan Jang, Daejeon (KR); Jun Kyu Kim, Daejeon (KR); Bo Hyun Seong, Daejeon (KR); Su Jin Kim, Daejeon (KR); Seon Jung Jung, Daejeon (KR); and Ji Yoon Jeong, Daejeon (KR)
Assigned to LG Chem, Ltd.
Filed by LG Chem, Ltd., Seoul (KR)
Filed on Feb. 10, 2021, as Appl. No. 17/172,578.
Application 17/172,578 is a division of application No. 16/080,904, granted, now 10,961,356, previously published as PCT/KR2017/013366, filed on Nov. 22, 2017.
Claims priority of application No. 10-2016-0174930 (KR), filed on Dec. 20, 2016; and application No. 10-2017-0155824 (KR), filed on Nov. 21, 2017.
Prior Publication US 2021/0163693 A1, Jun. 3, 2021
Int. Cl. C08J 3/075 (2006.01); C08J 3/12 (2006.01); C08L 33/06 (2006.01); C08J 3/24 (2006.01); C08F 2/44 (2006.01); C08L 33/02 (2006.01); A61L 15/60 (2006.01); C08F 2/06 (2006.01); C08F 20/04 (2006.01); C08F 20/18 (2006.01); C08K 3/26 (2006.01); C08L 71/02 (2006.01)

CPC C08J 3/075 (2013.01) [A61L 15/60 (2013.01); C08F 2/06 (2013.01); C08F 2/44 (2013.01); C08F 20/04 (2013.01); C08F 20/18 (2013.01); C08J 3/12 (2013.01); C08J 3/24 (2013.01); C08J 3/245 (2013.01); C08K 3/26 (2013.01); C08L 33/02 (2013.01); C08L 33/06 (2013.01); C08L 71/02 (2013.01); C08J 2300/14 (2013.01); C08J 2333/02 (2013.01); C08J 2371/02 (2013.01); C08J 2433/02 (2013.01); C08K 2003/262 (2013.01); C08K 2003/265 (2013.01); C08K 2003/267 (2013.01); C08L 2312/00 (2013.01)]

8 Claims

1. A superabsorbent polymer comprising:

a base polymer resulting from polymerization and internal crosslinking of a monomer composition including acrylic acid-based monomers having acidic groups which are at least partially neutralized; and

a surface crosslinking layer formed on the surface of the base polymer,

wherein the base polymer has centrifuge retention capacity (CRC) of 35 g/g or more as measured in accordance with EDANA WSP 241.3, absorption rate of 40 seconds or less as measured by a vortex method, and bulk density of 0.51 g/mL to 0.70 g/mL,

wherein the superabsorbent polymer has centrifuge retention capacity (CRC) of 30 g/g or more as measured in accordance with EDANA WSP 241.3, and

wherein the superabsorbent polymer has absorption rate of 30 seconds or less as measured by a vortex method.