Super Absorbent Polymer And Method For Producing Same

A super absorbent polymer comprising:

• a base polymer powder including a first crosslinked polymer of a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups;
• and
• a surface crosslinked layer formed on the base polymer powder and including a second crosslinked polymer in which the first crosslinked polymer is further crosslinked via a surface crosslinking agent,
• wherein the surface crosslinking agent includes at least two compounds having a solubility parameter value (σ) of 12.5 (cal/cm3)1/2 or more,
• wherein at least one of the surface crosslinking agents is an alkylene carbonate-based compound, and the remainder is selected from the group consisting of an alkylene carbonate-based compound and a polyhydric alcohol-based compound, and
• wherein the permeability measured and calculated by the method of the following Equation 1 is 10 to 35 seconds:
• Permeability (sec)=TS−T0 [Equation 1]
• wherein:
• Ts (unit:
• sec) means the time required for allowing a 0.9% saline (NaCl) solution to permeate a saline-absorbed super absorbent polymer under a load of 0.3 psi, wherein the saline-absorbed super absorbent polymer is prepared by swelling 0.2 g of super absorbent polymer with the 0.9% saline solution for 30 minutes, and
• T0 (unit:
• sec) means the time required for allowing the 0.9% saline solution to permeate under the load of 0.3 psi in the absence of the saline-absorbed super absorbent polymer.