US 12,357,966 B2
Superabsorbent polymer and method of producing the same
Zhong-Yi Chen, Kaohsiung (TW); Yu-Sam Lin, Kaohsiung (TW); Ya-Chi Lin, Kaohsiung (TW); and Ping-Chung Cheng, Kaohsiung (TW)
Assigned to FORMOSA PLASTICS CORPORATION, Kaohsiung (TW)
Filed by FORMOSA PLASTICS CORPORATION, Kaohsiung (TW)
Filed on Nov. 18, 2021, as Appl. No. 17/529,850.
Claims priority of application No. 110128613 (TW), filed on Aug. 3, 2021.
Prior Publication US 2023/0049825 A1, Feb. 16, 2023
Int. Cl. B01J 20/26 (2006.01); B01J 20/04 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01)
CPC B01J 20/267 (2013.01) [B01J 20/041 (2013.01); B01J 20/28004 (2013.01); B01J 20/28026 (2013.01); B01J 20/28047 (2013.01); B01J 20/28066 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of producing superabsorbent polymer, comprising:
performing a free radical polymerization reaction to a superabsorbent polymer composition and calcined shell powders to obtain a colloid gel, wherein the superabsorbent polymer composition includes an unsaturated monomer aqueous solution, a polymerization initiator, and a free radical polymerization crosslinking agent, the calcined shell powders comprise calcium carbonate, the calcined shell powders have a core-shell structure, the calcined shell powders have a particle size of 100 μm to 1 mm, and based on an amount of the unsaturated monomer aqueous solution as 100 wt %, the amount of the calcined shell powders is 0.005 wt % to 10 wt %;
smashing and screening the colloid gel to obtain a plurality of superabsorbent polymer particles; and
performing a surface crosslinking reaction to the superabsorbent polymer particles to obtain the superabsorbent polymer.