Absorption agent and absorbent article

Patent metadata

Field	Value
Publication number	US-11607667-B2
Application number	US-201816762994-A
Country	US
Kind code	B2
Filing date	Nov 14, 2018
Priority date	Nov 16, 2017
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

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)).

First claim

The invention claimed is:

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 .

Assignees

• Nippon Catalytic Chem Ind

Inventors

• Kawada Hiroki
• Iwamura Taku
• Tachi Koji
• Masuda Makiko
• Nakashima Yasuhisa
• Torii Kazushi
• Kasano Yukihiro

Classifications

• B01J20/28

  characterised by their form or physical properties · CPC title

• C08F2800/20

  as weight or mass percentages · CPC title

• B65G65/48

  using other rotating means, e.g. rotating pressure sluices in pneumatic systems {(B65G53/46 takes precedence)} · CPC title

• A61F2013/530489

  being randomly mixed in with other material · CPC title

• C08F2810/20

  leading to a crosslinking, either explicitly or inherently · CPC title