Crosslinking agent compound and superabsorbent polymer prepared by using the same

Patent metadata

Field	Value
Publication number	US-11970443-B2
Application number	US-201916966324-A
Country	US
Kind code	B2
Filing date	Oct 18, 2019
Priority date	Oct 18, 2018
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

Provided are a novel crosslinking agent compound, and a superabsorbent polymer prepared by using the same. More particularly, provided are a crosslinking agent compound having a novel structure, which exhibits excellent crosslinking property and thermal degradability, and a superabsorbent polymer prepared by using the same.

First claim

The invention claimed is:

1. A composition comprising a crosslinking agent compound represented by Chemical Formula 1, and an acrylic acid-based monomer:

in Chemical Formula 1,
R 1 and R 2 are each independently hydrogen or methyl,
R 3 and R 4 are each independently alkyl having 1 to 20 carbon atoms,
R 5 and R 6 are each independently hydrogen, alkyl having 1 to 20 carbon atoms, or cycloalkyl having 3 to 20 carbon atoms, or R 5 and R 6 are connected to each other to form a divalent aliphatic ring, and
n is an integer of 0 to 10.

2. The composition of claim 1 , wherein R 1 and R 2 are hydrogen.

3. The composition of claim 1 ,
wherein R 3 and R 4 are each independently alkyl having 1 to 20 carbon atoms, and
R 5 and R 6 are each independently hydrogen, alkyl having 1 to 5 carbon atoms, or divalent form of cycloalkane formed by connecting two or more groups adjacent to each other.

4. The composition of claim 3 ,
wherein R 3 and R 4 are each independently methyl, or ethyl, and
R 5 and R 6 are each independently hydrogen, methyl, or ethyl.

5. The composition of claim 1 ,
wherein n is an integer of 0 to 5.

6. The composition crosslinking agent compound of claim 1 ,
wherein Chemical Formula 1 is selected from compounds represented by the following Chemical Formulae 1-1 to 1-3:

7. A superabsorbent polymer comprising a polymer which is obtained by polymerizing the composition of claim 1 , wherein the polymer comprises a thermally degradable internal crosslinked structure.

8. The superabsorbent polymer of claim 7 , wherein the acrylic acid-based monomer is represented by the following Chemical Formula 2:
R-COOM  [Chemical Formula 2]

in Chemical Formula 1,
R is an alkyl group containing an unsaturated bond and having 2 to 5 carbon atoms, and
M is a hydrogen atom, a monovalent or divalent metal, an ammonium group, or an organic amine salt.

9. The superabsorbent polymer of claim 7 , wherein the polymer is configured to be thermally degraded at a temperature of 180° C. or higher.

10. The superabsorbent polymer of claim 7 , further comprising a surface-crosslinked layer which is formed on the surface of the polymer.

11. The superabsorbent polymer of claim 7 , wherein the polymer has 5% to 30% increased centrifuge retention capacity (CRC) after exposure to a temperature of 185° C. for 40 minutes as compared with that before the exposure to the temperature of 185° C. for 40 minutes.

12. The superabsorbent polymer of claim 10 , wherein the surface-crosslinked layer is formed on the surface of the polymer by performing a surface crosslinking reaction at a temperature of 180° C. or higher.

13. The superabsorbent polymer of claim 10 , wherein the superabsorbent polymer has centrifuge retention capacity (CRC) from 33 g/g to 50 g/g and absorbency under pressure (AUP) of 0.7 psi of 21 g/g to 30 g/g.

Assignees

• Lg Chemical Ltd

Inventors

• Lim Won Taeck
• Choi Wonmun
• Kim Gicheul
• Kim Ki Hyun
• Lee Seul Ah

Classifications

• C07C69/606 Primary

  having only {or additionally} carbon-to-carbon triple bonds as unsaturation in the carboxylic acid moiety · CPC title

• B01J20/267

  Cross-linked polymers · CPC title

• C08F20/06

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

• B01J2220/68

  Superabsorbents · CPC title

• C08J3/245

  Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking · CPC title