SUPERABSORBENT POLYMER AND METHOD FOR PREPARING SAME

• Main Authors: SOHN JUNG MIN, LEE YONG HUN, LEE HYEMIN, HAN CHANG SUN
• Format: Patent
• Language: Chinese; English
• Published: 21.12.2018
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The present invention relates to a superabsorbent polymer exhibiting more improved absorptive capacity, liquid permeability, and the like under pressure while fundamentally maintaining an excellent absorptive performance and absorption rate, and to a method for preparing same. The superabsorbent polymer comprises: a base polymer powder comprising a first crosslinking polymer of water-soluble ethylene-based unsaturated monomers having an at least partially neutralized acidic group; and a surface crosslinkage layer formed on the base polymer powder and comprising a second crosslinking polymer inwhich the first crosslinking polymer is additionally crosslinked via a surface crosslinker, wherein the surface crosslinker comprises at least two compounds having a solubility parameter (SP value sigma) of 12.5 (cal/cm )<1/2> or greater and wherein at least one of the surface crosslinker is an alkylene carbonate-based compound and the other is selected from the group consisting of an alkylenecarbonate-based compound and