ABSORBER AND ABSORBENT ARTICLE

• Main Authors: YOKOYAMA HIDEKI, YABUGUCHI HIROKI, MURAKAMI MASAHIRO, HINAYAMA TETSUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 15.10.2020
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PROSTHESES; TREATMENT OR PROTECTION OF EYES OR EARS

To provide an absorber including a water-absorbent resin that has excellent water absorbability and, when being used for an absorber, can improve absorption performance under a load, and absorbent article using the absorber.SOLUTION: An absorber includes a water-absorbent resin that is a polymer cross-linked product of a water-soluble ethylenically unsaturated monomer, an internal cross-linking agent and a post-cross-linking agent, and hydrophilic fibers, where the water-absorbent resin satisfies the following characteristics: (A) the water absorption capacity of physiological saline under a load of 4.14 kPa is 16 mL/g or more; (B) the mass ratio of 150-850 μm particles to the entire water-absorbent resin is 85 mass% or more, and the mass ratio of 300-400 μm particles thereto is 20 mass% or more; (C) tanδ measured by classifying the 300-400 μm particles of the water-absorbent resin is 2.00×10-2 or less; and (D) an absorber having an absorption capacity elasticity index expressed by the following formula (I) is 68000 or more. Absorption capacity elasticity index=storage elastic modulus [Pa]×centrifugal retention rate [g/g] ... (I).SELECTED DRAWING: Figure 1 【課題】吸水性能に優れ、吸収体に使用した場合に荷重下での吸収性能を向上させることができる吸水性樹脂を含む吸収体及び該吸収体を用いた吸収性物品を提供する。【解決手段】水溶性エチレン性不飽和単量体と内部架橋剤と後架橋剤との重合体架橋物である吸水性樹脂と、親水性繊維と、を含み、前記吸水性樹脂が、（Ａ）４．１４ｋＰａ荷重下での生理食塩水吸水能が１６ｍＬ／ｇ以上、（Ｂ）前記吸水性樹脂全体に占める１５０〜８５０μｍの粒子の質量割合が８５質量％以上であり、且つ、３００〜４００μｍの粒子の質量割合が２０質量％以上、（Ｃ）前記吸水性樹脂の３００〜４００μｍの粒子を分級して測定したｔａｎδが２．００×１０−２以下、および（Ｄ）下記式（Ｉ）で表される吸収容量弾性指数が６８０００以上である、吸収体。吸収容量弾性指数＝貯蔵弾性率［Ｐａ］×遠心保持率［ｇ／ｇ］ ・・・（Ｉ）【選択図】図１