POLYACRYLIC ACID (SALT) WATER-ABSORBENT RESIN POWDER, AND METHOD FOR PRODUCING SAME

摘要

Provided is a water absorbent resin having excellent liquid permeability, water absorbent speed, anti-impact stability, and weather resistance. Provided is a polyacrylic acid (salt)-based water absorbent resin powder in which the water absorption capacity without load (CRC) is 30 to 45 [g/g], the water absorption capacity under load (AAP 0.3) is 20 to 35 [g/g], the water absorption capacity under load (AAP 0.7) is 10 to 28 [g/g], and the weight average particle diameter (D50) is 300 to 500 µm, characterized by including p-methoxyphenol; having a degradable soluble component (0.05%L-A (saline) for 2 hours / 60°C, one hour extraction rinse / room temperature) of 40% by weight or less; and having a internal gas bubbles ratio of 0.1 to 2.5%, as specified by the following equation. Internal gas bubbles ratio % = True density - Apparent density / True density x 100