In the particulate water-absorbing agent as a main component a water absorbent resin, it is excellent in powder conveying property, it can exhibit sufficient absorption performance for use in the absorber, the present invention, particles of suitable absorbent material for actual use more I give Joe a water-absorbing agent. As characteristics that are not known at all, to control at the same time "pressure flow-through efficiency (PPUP)" and "positive charge the triboelectric charge" of the particulate water-absorbing agent, the present invention further, 2 to the "moisture content I want to control to 10% by weight ". In addition, the particulate water absorbing agent including the water-swellable crosslinked polymer from the salt-containing unsaturated monomer and / or acid groups (A) and (B) satisfies the specific requirements.本発明は、吸水性樹脂を主成分とする粒子状吸水剤において、粉体搬送性に優れ、吸収体での使用に充分な吸収性能を発揮でき、さらに実使用で好適な吸収体用の粒子状吸水剤を与える。本発明は、従来全く知られていない特性として、粒子状吸水剤の「加圧下通液効率(PPUP)」および「摩擦帯電電荷を正電荷」を同時に制御し、さらに、「含水率を2~10質量%」に制御する。また、酸基および/またはその塩含有不飽和単量体からの水膨潤性架橋重合体(A)および水(B)を含む上記の粒子状吸水剤は特定の要件を満たす。
