发明名称 |
POLYACRYLIC ACID (SALT) WATER ABSORBENT, AND METHOD FOR PRODUCING SAME |
摘要 |
Provided is a water-absorbing agent which is less likely to cause gel blocking and is suitable for a sanitary product and an absorbent article each being thin and containing a large amount of a water-absorbing agent, and which, while maintaining or hardly losing the other physical properties (a fluid retention capacity and a bulk specific gravity) of the water-absorbing agent, simultaneously achieves a high water absorbing speed (e.g., FSR), a high fluid retention capacity under load, high liquid permeability, and salt tolerance. The water-absorbing agent is a polyacrylic acid (salt)-based water-absorbing agent whose surface and its vicinity are crosslinked by an organic surface crosslinking agent, characterized by satisfying the following (A)-(D): (A) Free Swell Rate (FSR) of at least 0.28 g/g/s, or Absorption Time (Vortex) of 42 seconds or less; (B) Absorption Against Pressure (AAP) of at least 20 g/g; (C) Salt Tolerance Index represented by “Salt Tolerance Index=(CRCdw)/(CRCs)” where CRCdw is a centrifuge retention capacity (unit; g/g) for deionized water (dw), and CRCs is a centrifuge retention capacity (unit; g/g) for a 0.9 weight % saline, satisfying “Salt Tolerance Index≦0.49×CRCs−7.47”; and (D) Bulk Specific Gravity of 0.55 to 0.70 g/cm3. |
申请公布号 |
US2016375171(A1) |
申请公布日期 |
2016.12.29 |
申请号 |
US201415106109 |
申请日期 |
2014.12.19 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
OMORI Kohei;TORII Kazushi;TANAKA Nobuya;WATANABE Yusuke |
分类号 |
A61L15/26;C08J3/24;A61L15/60;B01J20/26;B01J20/30 |
主分类号 |
A61L15/26 |
代理机构 |
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代理人 |
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主权项 |
1. A polyacrylic acid (salt)-based water-absorbing agent whose surface and its vicinity are crosslinked by an organic surface crosslinking agent, characterized by satisfying the following (A)-(D):
(A) Free Swell Rate (FSR) of at least 0.28 g/g/s, or Absorption Time (Vortex) of 42 seconds or less; (B) Absorption Against Pressure (AAP) of at least 20 g/g; (C) Salt Tolerance Index represented by the following Formula 1 satisfying the following Formula 2:
Salt Tolerance Index=(CRCdw)/(CRCs) (Formula 1) where CRCdw is a centrifuge retention capacity (unit; g/g) for deionized water (dw), and CRCs is a centrifuge retention capacity (unit; g/g) for a 0.9 weight % saline,
Salt Tolerance Index≦0.49×CRCs−7.47 (Formula 2); and (D) Bulk Specific Gravity of 0.55 to 0.70 g/cm3. |
地址 |
Osaka-shi, Osaka JP |