Super absorbent polymer

Patent metadata

Field	Value
Publication number	US-12558670-B2
Application number	US-202519041418-A
Country	US
Kind code	B2
Filing date	Jan 30, 2025
Priority date	Mar 20, 2024
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A super absorbent polymer may exhibit improved absorption rate and absorption performance. The super absorbent polymer may be a polyacrylic acid or salt thereof-based super absorbent polymer. The superabsorbent polymer may have a value F1 from 0.55 to 0.65 calculated by Equation 1: F1=K1(0.5)×[{(A(CRC) 0.1 ×C(Convexity)×D(Circularity) 0.5 )}/(B(Aspect ratio) 0.3 )]. The superabsorbent polymer may have a value F2 from 0.65 to 0.75 calculated by Equation 2: F2=K2×[(B 0.2 )/{(A 0.1 ×C×D 0.5 )}]. The variables included in Equations 1 and 2 are described in detail in the disclosure.

First claim

What is claimed is:

1 . A polyacrylic acid or salt thereof-based super absorbent polymer, wherein:
F1 calculated by Equation 1 is from 0.55 to 0.65, F2 calculated by Equation 2 is from 0.65 to 0.75, and wherein a vortex time for particles having a particle diameter from 300 μm to 425 μm is less than 38 seconds, wherein the vortex time is measured according to a vortex measurement method at 24.0° C.:
F 1 =K 1×[( A 0.1 ×C×D 0.5 )/( B 0.3 )]  [Equation 1]

F 2= K 2×[( B 0.2 )/{( A 0.1 ×C×D 0.5 )}]  [Equation 2]

wherein in Equation 1 and Equation 2: K1 is a correction constant of 0.5, K2 is a correction constant of 0.8, A is a centrifuge retention capacity (CRC) for particles having a particle diameter from 300 μm to 425 μm, measured according to WSP 241.3 of the European Disposables and Nonwovens Association (EDANA), wherein the centrifuge retention capacity (CRC) for the particles having a particle diameter from 300 μm to 425 μm is 30 g/g or greater, B is an average value of an aspect ratio (A/R) for particles having a particle diameter from 100 μm to 600 μm, C is an average value of a convexity for particles having a particle diameter from 100 μm to 600 μm, and D is an average value of a circularity for particles having a particle diameter from 100 μm to 600 μm.

2 . The super absorbent polymer of claim 1 , wherein the F1 is from 0.57 to 0.64.

3 . The super absorbent polymer of claim 1 , wherein the F2 is from 0.65 to 0.72.

4 . The super absorbent polymer of claim 1 , wherein the centrifuge retention capacity (CRC) for the particles having a particle diameter from 300 μm to 425 μm is greater than 34 g/g.

5 . The super absorbent polymer of claim 1 , wherein the average value of the aspect ratio A/R for the particles having a particle diameter from 100 μm to 600 μm is from greater than or equal to 0.65 to less than 0.75.

6 . The super absorbent polymer of claim 1 , wherein the average value of the convexity for the particles having a particle diameter from 100 μm to 600 μm is from 0.80 to 0.94.

7 . The super absorbent polymer of claim 1 , wherein the average value of the circularity for the particles having a particle diameter from 100 μm to 600 μm is from 0.70 to 0.90.

8 . The super absorbent polymer of claim 1 , wherein when 1 g of the particles having a particle diameter from 300 μm to 425 μm is swollen for 1 minute with water having an electrical conductivity value of 110 μS/cm, a free swell capacity of the super absorbent polymer is 120 g or more.

Assignees

• Lg Chemical Ltd

Inventors

• Park Sung Soo
• Woo Hee Chang
• Lee Jun Wye
• Shin Kwang In

Classifications

• B01J20/28004

  Sorbent size or size distribution, e.g. particle size · CPC title

• C08F220/06 Primary

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• B01J20/28011 Primary

  Other properties, e.g. density, crush strength · CPC title

• C08F2810/20

  leading to a crosslinking, either explicitly or inherently · CPC title

• B01J20/28016

  Particle form · CPC title