US 12,383,885 B2
Super absorbent polymer
Sung Soo Park, Daejeon (KR); Kwangin Shin, Daejeon (KR); Heechang Woo, Daejeon (KR); and Junwye Lee, Daejeon (KR)
Assigned to LG Chem, Ltd., Seoul (KR)
Filed by LG Chem, Ltd., Seoul (KR)
Filed on Oct. 22, 2024, as Appl. No. 18/922,670.
Claims priority of application No. 10-2023-0165504 (KR), filed on Nov. 24, 2023.
Prior Publication US 2025/0170558 A1, May 29, 2025
Int. Cl. B01J 20/292 (2006.01); B01J 20/26 (2006.01); B01J 20/285 (2006.01); B01J 20/30 (2006.01)
CPC B01J 20/267 (2013.01) [B01J 20/3007 (2013.01); B01J 20/3021 (2013.01); B01J 20/3078 (2013.01); B01J 20/3085 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A super absorbent polymer that is a polyacrylic acid or salt thereof—based super absorbent polymer,
wherein for all particles, an average value of circularity, which is calculated according to Expression 1 below, is approximately 0.90 or less,
an average value of an aspect ratio (A/R), which means a ratio of a shortest diameter of a particle to a longest diameter of the particle, is approximately 0.70 or more, and
an absorbency under pressure (AUP), which is measured at 2.07 kPa (0.3 psi) according to EDANA method WSP 242.3, is approximately 25 g/g or more:
circularity=perimeter of circle equivalent (CE) particle/perimeter of actual particle  <Expression 1>
in Expression 1 above,
the perimeter of the CE particle means a perimeter length of a circle that has the same area as a two-dimensional image of a three-dimensional particle to be measured, and
the perimeter of the actual particle means a perimeter length of the two-dimensional image of the three-dimensional particle to be measured.