US 12,239,958 B2
Super absorbent polymer composition and preparation method for the same
Dae Woo Nam, Daejeon (KR); Jin Seok Seo, Daejeon (KR); and Sujin Kim, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Appl. No. 17/631,746
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Sep. 29, 2020, PCT No. PCT/KR2020/013303
§ 371(c)(1), (2) Date Jan. 31, 2022,
PCT Pub. No. WO2021/066503, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 10-2019-0120943 (KR), filed on Sep. 30, 2019; and application No. 10-2020-0126245 (KR), filed on Sep. 28, 2020.
Prior Publication US 2022/0274092 A1, Sep. 1, 2022
Int. Cl. B01J 20/26 (2006.01); C08F 120/06 (2006.01); C08J 3/24 (2006.01); C08K 5/053 (2006.01); C08K 5/1565 (2006.01)
CPC B01J 20/267 (2013.01) [B01J 20/261 (2013.01); C08F 120/06 (2013.01); C08J 3/245 (2013.01); C08K 5/053 (2013.01); C08K 5/1565 (2013.01); B01J 2220/68 (2013.01); C08K 2201/019 (2013.01)] 16 Claims
 
1. A superabsorbent polymer composition comprising:
a superabsorbent polymer comprising a base resin comprising crosslinked polymer of acrylic acid based monomers having acid groups of which at least a part are neutralized, and an internal crosslinking agent; and a surface crosslink layer formed on the surface of the base resin, in which the crosslinked polymer is additionally crosslinked by a surface crosslinking agent; and
remaining surface crosslinking agent that does not form the surface crosslink layer,
wherein the remaining surface crosslinking agent that does not form the surface crosslink layer comprises a carbonate based compound and a diol based compound, a content of the carbonate based compound is 100 ppm or more based on a total weight of the superabsorbent polymer composition, and the content of the diol based compound is 1,000 ppm or more based on the total weight of the superabsorbent polymer composition, and
the superabsorbent polymer composition fulfills the following 1) to 3):
1. Vortex time according to a vortex method is 65 seconds or less;
2. Extractable contents after swelling for 16 hours, measured according to EDANA method WSP 270.3, is 15 wt % or less, based on the total weight of the superabsorbent polymer composition; and
3. Bulk density is 0.67 g/cm3 or more.