US 12,337,294 B2
Preparation method of super absorbent polymer composition
Yoon Jae Min, Daejeon (KR); Gicheul Kim, Daejeon (KR); Ki Hyun Kim, Daejeon (KR); Sung Soo Park, Daejeon (KR); Jinuk Choi, Daejeon (KR); Tae Yun Kim, Daejeon (KR); and Heechang Woo, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/611,332
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Dec. 18, 2020, PCT No. PCT/KR2020/018644
§ 371(c)(1), (2) Date Nov. 15, 2021,
PCT Pub. No. WO2021/125872, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0172494 (KR), filed on Dec. 20, 2019; application No. 10-2020-0007114 (KR), filed on Jan. 20, 2020; application No. 10-2020-0148077 (KR), filed on Nov. 6, 2020; and application No. 10-2020-0175607 (KR), filed on Dec. 15, 2020.
Prior Publication US 2022/0193634 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 20/26 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01)
CPC B01J 20/267 (2013.01) [B01J 20/28004 (2013.01); B01J 20/28016 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01); B01J 2220/44 (2013.01); B01J 2220/68 (2013.01)] 20 Claims
 
1. A preparation method of a super absorbent polymer composition, comprising
1) A step of forming a hydrogel polymer by cross-linking polymerization of a water-soluble ethylene-based unsaturated monomer having at least partially neutralized acidic groups in the presence of an internal cross-linking agent and a polymerization initiator;
2) A step of mixing the hydrogel polymer with a carboxylic acid-based additive, followed by pulverization to prepare a pulverized product containing hydrous super absorbent polymer particles and the additive; and
3) A step of preparing a super absorbent polymer composition containing super absorbent polymer particles and the additive by drying the pulverized product;
wherein the carboxylic acid-based additive is at least one selected from the group consisting of a carboxylic acid represented by the following Chemical Formula 1 and a salt thereof:

OG Complex Work Unit Chemistry
in Chemical Formula 1,
A is alkyl having 5 to 21 carbon atoms,
B1 is —OCO—, —COO—, or —COOCH(R1)COO—,
B2 is —CH2—, —CH2CH2—, —CH(R2)—, —CH═CH—, or —C≡C—,
wherein, R1 and R2 are each independently alkyl having 1 to 4 carbon atoms,
n is an integer of 1 to 3, and
C is a carboxyl group.