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US 11,633,719 B2Granted
Superabsorbent polymer composition and method for preparing the same
AssigneeLG Chem, Ltd.
InventorsSeonjung Jung, Dae Woo Nam, Bo Hyun Seong, Hyungki Yoon
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Abstract
The present invention relates to superabsorbent polymer and a method for preparing the same. The present invention can provide a superabsorbent polymer in which a hydrophobic material having an HLB of 0-6 and a surface cross-linking agent are mixed into a base resin prepared in the presence of water dispersible silica, thereby having improved rewetting characteristics and permeability through surface-modification of the base resin.
Claims15
A method for preparing superabsorbent polymer comprising:
- preparing a base resin in which acrylic acid-based monomers having acid groups, of which at least a part are neutralized, and an internal crosslinking agent are crosslinked, in the presence of colloidal silica;
- mixing a hydrophobic material having a HLB of 0 or more and 6 or less, and a surface crosslinking agent with the base resin to obtain a surface crosslinking solution;
- and
- increasing a temperature of the surface crosslinking solution to conduct surface crosslinking of the base resin.
1 more element
Dependencies are inferred from the claim text.