PROBLEM TO BE SOLVED: To provide absorbable resin particles having no problem in that the amount of water retention decreases largely along with the increase of the amount of water absorption under a load, that is, being excellent in both of the amount of water retention and the amount of water absorption under a load.SOLUTION: The absorbable resin particles are provided by including (A) crosslinked polymer particles containing (a1) a water soluble vinyl monomer and/or (a2) a hydrolyzable vinyl monomer, (a3) an internal crosslinking agent and (a4) a surface crosslinking agent as essential constituting units, and (B) lignin or its derivative, and the content of (B) the lignin or its derivative is preferably 0.1 to 30 wt.% based on the weight of (A) the crosslinked polymer particles.COPYRIGHT: (C)2013,JPO&INPIT【課題】荷重下吸水量を向上させるに伴い保水量が大きく低下するという問題がない、すなわち、保水量及び荷重下吸水量が共に優れる吸収性樹脂粒子を提供する。【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)、内部架橋剤(a3)並びに表面架橋剤(a4)を必須構成単位としてなる架橋重合体粒子(A)と、リグニンもしくはその誘導体(B)とを含んでなる吸収性樹脂粒子であり、リグニンもしくはその誘導体(B)の含有量は、架橋重合体粒子(A)の重量に基づいて、0.1~30重量%であることが好ましい。【選択図】なし
