Polyacrylic acid (salt) -based water-absorbing resin particles water-absorbing agent as a main component, a method of manufacturing, absorbent and absorbent article using the particulate water-absorbing agent

摘要

As characteristics that are not known at all, and control of particulate water-absorbing agent "under pressure flow-through efficiency (PPUP)" and, further, to control at the same time "granularity" and "colored" further. The present invention is a particulate water-absorbing agent satisfies the following (a) ~ a (c). (A) flow-through pressure efficiency (PPUP) is 50-100%. (YI) and is 0~10, (b) the degree of yellow, yellow rate of change of the 14-day coloring promotion test after a relative humidity 70 ± 1 ℃, 95 ± 1% (ΔYI) is 100-150%. 0 to 5% by weight, as defined in (c) standard sieve classification, particles of less than 150μm, mass-average particle diameter (D50) is from 0.20 to 0 logarithmic standard deviation of the particle size distribution and 200~550μm, is (σζ) is .40.