Surface-modified super absorbent resin and method for preparing same

Patent metadata

Field	Value
Publication number	US-10112176-B2
Application number	US-201515316930-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Dec 18, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

Disclosed herein is a superabsorbent polymer with a surface modified with both a water-soluble polyvalent cationic salt and a polycarbonic acid-based copolymer, wherein an improvement is brought about in processability without significant degradation of other properties and a method is provided for preparing the surface-modified superabsorbent polymer.

First claim

The invention claimed is:

1. A surface-modified superabsorbent polymer, having a surface modified with a water-soluble polyvalent cationic salt and a polycarbonic acid-based copolymer.

2. The surface-modified superabsorbent polymer of claim 1 , wherein the water-soluble polyvalent cationic salt is contained in an amount of 0.001 to 5.0 parts by weight, based on 100 parts by weight of a superabsorbent resin.

3. The surface-modified superabsorbent polymer of claim 1 , wherein the water-soluble polyvalent cationic salt comprise a cationic ion selected from the group consisting of Al 3+ , Zr 4+ , Sc 3+ , Ti 4+ , V 5+ , Cr 3+ , Mn 2+ , Fe 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Ag + , Pt 4+ , Au + , and a combination thereof, and an anion selected from the group consisting of sulfate (SO 4 2− ), sulfite (SO 3 2− ), nitrate (NO 3− ), metaphosphate (PO 3− ), phosphate (PO 4 3− ), and a combination thereof.

4. The surface-modified superabsorbent polymer of claim 3 , wherein the water-soluble polyvalent cationic salt is aluminum sulfate (Al 2 (SO 4 ) 3 ) or zirconium sulfate (Zr(SO 4 ) 2 ).

5. The surface-modified superabsorbent polymer of claim 1 , wherein the polycarbonic acid-based copolymer is contained in an amount of 0.001 to 5.0 parts by weight, based on 100 parts by weight of the superabsorbent polymer.

6. The surface-modified superabsorbent polymer of claim 1 , wherein the polycarbonic acid-based copolymer contains an alkoxypolyalkylene glycol mono(meth)acrylic acid ester monomer and a (meth)acrylic acid monomer.

7. The surface-modified superabsorbent polymer of claim 6 , wherein the alkoxypolyalkylene glycol mono(meth)acrylic acid ester monomer is represented by the following Chemical Formula 1:

wherein,
R 1 is a hydrogen atom or methyl;
R 2 O represents an oxyalkylene moiety of 2 to 4 carbon atoms;
R 3 is alkyl of 1 to 4 carbon atoms; and
m is an integer of 50 to 200, expressing an average addition mole number of oxyalkylene.

8. The surface-modified superabsorbent polymer of claim 6 , wherein the alkoxypolyalkylene glycol mono(meth)acrylic acid ester monomer is at least one selected from the group consisting of methoxypolyethylene glycol mono(meth)acrylate, methoxypolypropylene glycol mono(meth)acrylate, methoxypolybutylene glycol mono(meth)acrylate, methoxypolyethylene glycol polypropylene glycol mono(meth)acrylate, methoxypolyethylene glycol polybutylene glycol mono(meth)acrylate, methoxypolypropylene glycol polybutylene glycol mono(meth)acrylate, methoxypolyethylene glycol polypropylene glycol polybutylene glycol mono(meth)acrylate, ethoxypolyethylene glycol mono(meth)acrylate, ethoxypolypropylene glycol mono(meth)acrylate, ethoxypolybutylene glycol mono(meth)acrylate, ethoxypolyethylene glycol polypropylene glycol mono(meth)acrylate, ethoxypolyethylene glycol polybutylene glycol mono(meth)acrylate, ethoxypolypropylene glycol polybutylene glycol mono(meth)acrylate, and ethoxypolyethylene glycol polypropylene glycol polybutylene glycol mono(meth)acrylate.

9. The surface-modified superabsorbent polymer of claim 6 , wherein the (meth)acrylic acid monomer is represented by the following Chemical Formula 2:
R 2 —COOM 1   [Chemical Formula 2]

wherein,
R 2 is an unsaturated hydrocarbon of 2 to 5 carbon atoms; and
M 1 is a hydrogen atom, a monovalent or divalent metal, an ammonium group, or an organic amine group.

10. The surface-modified superabsorbent polymer of claim 6 , wherein the (meth)acrylic acid monomer is at least one selected from the group consisting of an acrylic acid, a methacrylic acid, a monovalent or divalent metal salt thereof, an ammonium salt thereof, and an organic amine salt thereof.

11. A method for preparing a surface-modified superabsorbent polymer, comprising:
a) providing a superabsorbent polymer;
b) pre-treating the superabsorbent polymer of step a) by mixing a water-soluble polyvalent cationic salt in an amount of 0.001 to 5.0 parts by weight, based on 100 parts by weight of the superabsorbent polymer provided in step a); and
c) surface treating the pre-treated superabsorbent polymer of step b) by mixing a polycarbonic acid-based copolymer in an amount of 0.001 to 5.0 parts by weight, based on 100 parts by weight of the superabsorbent polymer provided in step a).

12. A method for preparing a surface-modified superabsorbent polymer, comprising:
a) providing a superabsorbent polymer;
b) preparing a mixture solution comprising a water-soluble polyvalent cationic salt in an amount of 0.001 to 5.0 parts by weight and a polycarbonic acid-based copolymer in an amount of 0.001 to 5.0 parts by weight, based on 100 parts by weight of the superabsorbent polymer provided in step a); and
c) surface treating the superabsorbent polymer of step a) with the mixture solution of step b).

13. The method of claim 11 , wherein the water-soluble polyvalent cationic salt comprise a cationic ion selected from the group consisting of Al 3+ , Zr 4+ , Sc 3+ , Ti 4+ , V 5+ , Cr 3+ , Mn 2+ , Fe 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Ag + , Pt 4+ , Au + , and a combination thereof, and an anion selected from the group consisting of sulfate (SO 4 2− ), sulfite (SO 3 2− ), nitrate (NO 3− ), metaphosphate (PO 3− ), phosphate (PO 4 3− ), and a combination thereof.

14. The method of claim 11 , wherein the water-soluble polyvalent cationic salt is aluminum sulfate (Al 2 (SO 4 ) 3 ) or zirconium sulfate (Zr(SO 4 ) 2 ).

15. The method of claim 11 , wherein the polycarbonic acid-based copolymer contains an alkoxypolyalkylene glycol mono(meth)acrylic acid ester monomer and a (meth)acrylic acid monomer.

16. The method of claim 12 , wherein the water-soluble polyvalent cationic salt comprise a cationic ion selected from the group consisting of Al 3+ , Zr 4+ , Sc 3+ , Ti 4+ , V 5+ , Cr 3+ , Mn 2+ , Fe 3+ , Ni 2+ , Cu 2+ , Zn 2+ , Ag + , Pt 4+ , Au + , and a combination thereof, and an anion selected from the group consisting of sulfate (SO 4 2− ), sulfite (SO 3 2− ), nitrate (NO 3− ), metaphosphate (PO 3− ), phosphate (PO 4 3− ), and a combination thereof.

17. The method of claim 12 , wherein the water-soluble polyvalent cationic salt is aluminum sulfate (Al 2 (SO 4 ) 3 ) or zirconium sulfate (Zr(SO 4 ) 2 ).

18. The method of claim 12 , wherein the polycarbonic acid-based copolymer contains an alkoxypolyalkylene glycol mono(meth)acrylic acid ester monomer and a (meth)acrylic acid monomer.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Young-Sam
• Hong Yeon-Woo
• Ryu Dong-Jo

Classifications

• C08F220/06

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

• C08F2/48

  by ultraviolet or visible light · CPC title

• C08F2/10

  Aqueous solvent · CPC title

• C08J2333/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title