Absorption agent and absorbent article

{
  "publication_number": "US11607667B2",
  "country": "US",
  "kind": "B2",
  "title": "Absorption agent and absorbent article",
  "abstract": "Provided is a water-absorbing agent that causes no or little fluctuation of feed rate when fed with use of a feeder. A water-absorbing agent containing a water-absorbing resin as a main component, the water-absorbing agent satisfying the following (a) and (b): (a) K-index is 70 or more; and (b) Moisture absorption blocking ratio, after 30 minutes of standing at a temperature of 25° C. and a relative humidity of 80% RH, is 70 weight % or less, the K-index being defined by the following equation: K-index=100−(−438+3.6×angle of repose+3.5×angle of difference+7.9×compressibility rate+290×bulk density (EDANA method)).",
  "claims": [
    "1. A water-absorbing agent comprising a water-absorbing resin as a main component and a polyvalent metal salt in an amount of 0.001 to 10 parts by weight relative to 100 parts by weight of the water-absorbing resin, wherein said water-absorbing agent satisfies the following (a) and (b): (a) K-index is 70 or more; and (b) Moisture absorption blocking ratio, after 30 minutes of standing at a temperature of 25° C. and a relative humidity of 80% RH, is 70 weight % or less, the K-index being defined by the following equation: K-index=100−(−438+3.6×angle of repose+3.5×angle of difference+7.9×compressibility rate+290×bulk density (EDANA method)).",
    "2. The water-absorbing agent according to claim 1, wherein the moisture absorption blocking ratio is 40 weight % or less.",
    "3. The water-absorbing agent according to claim 1, wherein the moisture absorption blocking ratio is 30 weight % or less.",
    "4. The water-absorbing agent according to claim 1, wherein a powder flowability of said water-absorbing agent is 10.0 g/s or more.",
    "5. The water-absorbing agent according to claim 1, wherein a powder flowability of said water-absorbing agent is 11.0 g/s or more.",
    "6. The water-absorbing agent according to claim 1, wherein a surface tension of said water-absorbing agent is 65 mN/m or more.",
    "7. The water-absorbing agent according to claim 1, wherein diffusing absorbency, which is measured 10 minutes after a start of absorption of 0.9 weight % aqueous sodium chloride solution by said water-absorbing agent under a load of 1.96 kPa, is 15 g/g or more.",
    "8. The water-absorbing agent according to claim 1, wherein a probe insertion work of said water-absorbing agent is 30000 gf×mm or less.",
    "9. The water-absorbing agent according to claim 1, wherein a moisture content of said water-absorbing agent is 10 weight % or less.",
    "10. The water-absorbing agent according to claim 1, further comprising a surfactant.",
    "11. The water-absorbing agent according to claim 1, further comprising a hydrophilic polymer compound.",
    "12. The water-absorbing agent according to claim 1, wherein said water-absorbing agent is in the form of particles having a non-uniformly pulverized shape.",
    "13. An absorbent article comprising a water-absorbing agent recited in claim 1."
  ],
  "description_excerpt": "The present invention relates to a water-absorbing agent and an absorbent article.\n\nWater-absorbing resin (Super Absorbent Polymer, or SAP) is a water-swellable, water-insoluble polymer gelling agent. Water-absorbing resin is used for various applications. For example, water-absorbing resin is used in sanitary materials such as disposable diapers, sanitary napkins, and incontinence articles for adults, agricultural and horticultural water retaining agents, industrial waterproofing agents, and the like.\n\nWhen a disposable diaper (major application of SAP) is produced, a water-absorbing agent that contains a SAP (raw material) as a main component is fed. When such a feeding is carried out, generally, an apparatus to meter and convey the water-absorbing agent is used. For example, Non-patent Literature 1 (Handbook of Filters, 4 th Edition, page 281 “3.9 Feeding” George Wypych, ChemTec Publishing, Toronto, 2016 (the first edition was published in 1993)) discloses a rotary feeder, a screw feeder, a table feeder, and a belt feeder, which are examples of the above-mentioned apparatus. Non-patent Literature 1 also discloses, as an apparatus designed to accurately feed a bulk material, a bulk solid pump (BSP/Bulk Solids Pump™, also called “Bulk Solids Pump”) manufactured by Coperion K-tron.\n\nPatent Literature 1 (U.S. Pat. No. 5,051,041) and Patent Literature 2 (Published Japanese Translation of PCT International Application, Tokuhyohei, No. 5-503492) each disclose a multiple-choke apparatus to convey and meter a particulate material. Patent Literature 3 (U.S. Pat. No. 5,355,993), Patent Literature 4 (Japanese Patent No.",
  "cpc": [
    "B01J 20/267",
    "A61F 13/15658",
    "A61F 13/45",
    "A61F 13/53",
    "A61F 2013/15463",
    "A61F 2013/530489",
    "A61F 2013/530591",
    "A61F 2013/530686",
    "A61F 2013/530693",
    "A61F 2013/530751",
    "A61L 15/48",
    "A61L 15/60",
    "B01J 20/043",
    "B01J 20/26",
    "B01J 20/28",
    "B01J 20/28011",
    "B01J 20/28016",
    "B01J 2220/68",
    "B65G 31/04",
    "B65G 65/48",
    "C08F 220/06",
    "C08F 2800/20",
    "C08F 2810/20",
    "C08F 6/008"
  ],
  "ipc": [
    "A61F 13/15",
    "A61F 13/53",
    "B01J 20/04",
    "B01J 20/26",
    "B01J 20/28",
    "B65G 31/04",
    "B65G 65/48",
    "C08F 220/06"
  ],
  "assignees": [
    "Nippon Shokubai Co Ltd"
  ],
  "inventors": [
    "Hiroki Kawada",
    "Taku Iwamura",
    "Koji Tachi",
    "Makiko MASUDA",
    "Yasuhisa Nakashima",
    "Kazushi Torii",
    "Yukihiro Kasano"
  ],
  "filing_date": "2018-11-14",
  "publication_date": "2023-03-21",
  "grant_date": "2023-03-21",
  "priority_date": "2017-11-16",
  "application_number": "US-201816762994-A",
  "family_id": "66539071",
  "cited_by_count": 1,
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