Water-absorbing resin particle agglomerates

摘要

Provided are water absorbing resin particle agglomerates stably showing a high water retention property and satisfying the following requirements:(a) 50 mol% or greater of repeating units of the polymer molecular chain of the water absorbing resin constituting the primary particles are carboxyl group-containing units and at least a portion of carboxyl groups of the carboxyl group-containing units is neutralized with at least one base selected from alkali metals, amines, and ammonia, and (b) the water absorbing resin particle agglomerates comprise, on the outer surface thereof, a portion having a neutralization ratio of carboxyl groups of not greater than 40 mol% and, inside of the water absorbing resin particle agglomerates, a portion having a neutralization ratio of carboxyl groups of 50 mol% or greater.