PROBLEM TO BE SOLVED: To solve a problem that conventional methods for reducing a residual monomer amount are inferior in absorbing performance.SOLUTION: The absorbent resin particle comprises a crosslinked polymer particle (A) comprising as an essential constituting unit a water-soluble vinyl monomer (a1) and/or a hydrolyzable vinyl monomer (a2) and an internal crosslinking agent (b) and has a residual monomer content of at most 500 ppm, a water retention for physiological saline of 30-50 g/g and gel strength of 1-3 kN/m2 after deteriorated by artificial urine. Preferably the absorbent resin particle contains a hydrazide compound (c) in an amount of 0.001-10 wt.% based on the weight of the crosslinked polymer particle (A).COPYRIGHT: (C)2012,JPO&INPIT【課題】従来の残存モノマー量を低減する方法は、吸収性能が低いという問題がある。【解決手段】水溶性ビニルモノマー(a1)及び/又は加水分解性ビニルモノマー(a2)並びに内部架橋剤(b)を必須構成単位とする架橋重合体粒子(A)を含有してなり、残存モノマーが500ppm以下であり、生理食塩水に対する保水量が30~50g/gであり、人口尿劣化ゲル強度が1~3kN/m2である吸収性樹脂粒子であり、ヒドラジド化合物(c)を架橋重合体粒子(A)の重量に基づき、0.001~10重量%含有してなることが好ましい。【選択図】なし
