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.
Claims22
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.
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 crosslinking 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 crosslinking 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).
Dependencies are inferred from the claim text.