Granted Patent B2

US 12,629,658 · App. 18/894,676 · Granted May 19, 2026

Inventors: Heechang Woo (Daejeon, KR); Sung Soo Park (Daejeon, KR); Junwye Lee (Daejeon, KR)

Assignee: LG Chem, Ltd.

B01J20/261B01J2220/68

Abstract

Claims (34)

1 . A super absorbent polymer, which is a polyacrylic acid (salt)-based super absorbent polymer, wherein the super absorbent polymer is in the form of particles having micropores of 100 μm or less, wherein the super absorbent polymer has an absorbency under pressure (AUP) of 30 g/g or more as measured under 2.07 kPa (0.3 psi) according to the method of EDANA WSP 242.3, and wherein the super absorbent polymer has a S e /r value of 3.0 g/g/sec or more according to Equation 1 below:

S

t

=

S

e

×

(

1

-

e

-

t

/

r

)

[

Equation

⁢

1

]

wherein in Equation 1 above, t represents swelling time(s), S t represents the free-swelling capacity (g/g) of the super absorbent polymer in water having an electrical conductivity of 100 μS/cm to 130 μS/cm at the swelling time(s) t, and S e and r are constants, and

wherein the S e value is 310 g/g or more and the r value is 102 seconds or less.

2 . The super absorbent polymer of claim 1 , wherein the super absorbent polymer has a centrifuge retention capacity (CRC) of 35 g/g or more as measured according to the method of EDANA WSP 241.3.

3 . The super absorbent polymer of claim 1 , wherein the super absorbent polymer has vortex time measured by a vortex measurement method at 24.0° C. of 30 seconds or less.

4 . The super absorbent polymer of claim 1 , wherein the super absorbent polymer has a centrifuge retention capacity (CRC) of 35 g/g or more as measured according to the method of EDANA WSP 241.3, and

wherein the super absorbent polymer has vortex time measured by a vortex measurement method at 24.0° C. of 30 seconds or less.

5 . The super absorbent polymer of claim 1 , wherein the S e /r value is 3.7 g/g/sec or more.

6 . The super absorbent polymer of claim 1 , wherein the S e value is 330 g/g or more.

7 . The super absorbent polymer of claim 1 , wherein the super absorbent polymer has a centrifuge retention capacity (CRC) of 33 g/g or more as measured according to the method of EDANA WSP 241.3.

8 . The super absorbent polymer of claim 1 , wherein the super absorbent polymer has vortex time measured by a vortex measurement method at 24.0° C. of 40 seconds or less.

9 . The super absorbent polymer of claim 1 , wherein the super absorbent polymer has a free-swelling capacity (St) of 80 g/g or more at 30 seconds in water having an electrical conductivity of 110 μS/cm.

10 . The super absorbent polymer of claim 1 , wherein the polyacrylic acid (salt)-based super absorbent polymer comprises base polymer powder including a water-soluble ethylene-based unsaturated monomer having an acid group and a cross-linked polymer of an internal cross-linking agent.

11 . The super absorbent polymer of claim 10 , wherein the polyacrylic acid (salt)-based super absorbent polymer comprises a surface cross-linked layer formed on the base polymer powder by additionally cross-linking the cross-linked polymer by a surface cross-linking agent.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (164)