Surface cross-linked super absorbent resin and method for preparing same
AssigneeLG Chem, Ltd.
InventorsYoung-Sam Kim, Yeon-Woo Hong, Dong-Jo Ryu
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Abstract
Disclosed herein is a superabsorbent polymer with a surface crosslinked with a water-soluble polyvalent cationic salt, a polycarbonic acid-based copolymer, and a surface crosslinking agent wherein an improvement is brought about in physical properties, with the concomitant reduction of process time and cost. Also, a method is provided for preparing the surface-crosslinked superabsorbent polymer.
Claims26
A surface-crosslinked superabsorbent polymer, wherein a base resin of a superabsorbent polymer is surface crosslinked with a water-soluble polyvalent cationic salt, a polycarbonic acid-based copolymer, and a surface crosslinking agent.
(canceled)
14-25. (canceled)
A method for preparing a surface-crosslinked superabsorbent polymer, comprising:
- a) providing a superabsorbent base resin;
- b) pre-treating the superabsorbent base resin 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 base resin provided in step a);
- and
- c) subjecting the pre-treated superabsorbent base resin of step b) to surface crosslinking modification with a mixture solution comprising a polycarbonic acid-based copolymer in an amount of 0.001 to 5.0 parts by weight and a surface cros slinking agent in an amount of 0.001 to 5.0 parts by weight, based on, based on 100 parts by weight of the superabsorbent base resin.
A method for preparing a surface-modified superabsorbent polymer, comprising:
- a) providing a superabsorbent base resin;
- b) preparing a mixture solution comprising a water-soluble polyvalent cationic salt in an amount of 0.001 to 5.0 parts by weight, a polycarbonic acid-based copolymer in an amount of 0.001 to 5.0 parts by weight, and a surface cros slinking agent in an amount of 0.001 to 5.0 parts by weight, based on 100 parts by weight of the superabsorbent base resin;
- and
- c) subjecting the superabsorbent bas resin of step a) to surface crosslinking modification with the mixture solution of step b).
The method of claim, wherein the surface crosslinking modification is carried out at 100 to 300° C. for 1 to 90 min.
(canceled)
The method of claim, wherein the water-soluble polyvalent cationic salt comprise a cationic ion selected from the group consisting of Al3+, Zr4+, Sc3+, Ti4+, V5+, CR3+, Mn2+, Fe3+, Ni2+, Cu2+, Zn2+, Ag+, Pt4+, Au+, and a combination thereof, and an anion selected from the group consisting of sulfate (SO42−), sulfite (SO32−), nitrate (NO3−), metaphosphate (PO3−), phosphate (PO43−), and a combination thereof.
33-45. (canceled)
Dependencies are inferred from the claim text.