Particulate water-absorbing agent

Abstract

[Problem] To provide a particulate water-absorbing agent that can significantly reduce re-wet even when pressure is applied to the particulate water-absorbing agent from the outside when the particulate water-absorbing agent is in a swollen state. [Solution] A particulate water-absorbing agent comprising a surface-crosslinked polyacrylic acid (salt)-based water-absorbing resin as a main component and satisfying the following expression (1). AAP ⁡ ( 2.06 kPa ) + RCAP ⁡ ( 2.06 kPa ) ≥ 0 . 5 ⁢ 8 × CRC + 55.6 , ( 1 ) wherein AAP (2.06 kPa) represents absorption capacity (g/g) under a pressure of 2.06 kPa, RCAP (2.06 kPa) represents retention capacity against pressure after swelling (g/g), and CRC represents absorption capacity without pressure (g/g).

Dependencies are inferred from the claim text.