Ultrathin fluid-absorbent cores

Patent metadata

Field	Value
Publication number	US-9962459-B2
Application number	US-201113172452-A
Country	US
Kind code	B2
Filing date	Jun 29, 2011
Priority date	Jul 2, 2010
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

The present invention relates to ultrathin fluid-absorbent cores comprising a substrate layer, water-absorbent polymer particles and an adhesive, wherein the water-absorbent polymer particles comprise a basic salt of a polyvalent metal cation and a monovalent carboxylic acid anion on the surface and the wet SAP shake out of water-absorbent polymer particles out of the fluid-absorbent core is less than 10% by weight.

First claim

The invention claimed is:

1. A fluid-absorbent core comprising a substrate layer, at least 75% by weight of water-absorbent polymer particles, and an adhesive, wherein the water-absorbent polymer particles comprise a basic salt of a polyvalent metal cation and a monovalent carboxylic acid anion on a surface and the wet SAP shake out of water-absorbent polymer particles out of the fluid-absorbent core is less than 10% by weight.

2. The fluid-absorbent core according to claim 1 , wherein the fluid-absorbent core comprises at least 85% by weight of the water-absorbent polymer particles.

3. The fluid-absorbent core according to claim 1 , wherein the fluid-absorbent core comprises not more than 10% by weight of the adhesive.

4. The fluid-absorbent core according to claim 1 , wherein the wet SAP shake out of water-absorbent polymer particles out of the fluid-absorbent core is less than 5% by weight.

5. The fluid-absorbent core according to claim 1 , wherein the adhesive is a pressure sensitive adhesive.

6. The fluid-absorbent core according to claim 1 , wherein the substrate layer is a nonwoven layer or a tissue paper.

7. The fluid-absorbent core according to claim 1 , wherein the fluid-absorbent core comprises at least two layers of water-absorbent polymer particles.

8. The fluid-absorbent core according to claim 1 , wherein the water-absorbent polymer particles are placed in discrete regions.

9. The fluid-absorbent core according to claim 1 , wherein the water-absorbent polymer particles comprise from 0.001 to 0.05 mol of the polyvalent metal cation per 100 g of the water-absorbent polymer particles.

10. The fluid-absorbent core according to claim 1 , wherein the polyvalent metal cation is a trivalent metal cation.

11. The fluid-absorbent core according to claim 1 , wherein the monovalent carboxylic acid anion is a substituted or unsubstituted acetic acid anion.

12. The fluid-absorbent core according to claim 1 , wherein the basic salt comprises at least one stabilizer.

13. The fluid-absorbent core according to claim 12 , wherein the stabilizer is boric acid and/or aspartic acid.

14. The fluid-absorbent core according to claim 1 , wherein the water-absorbent polymer particles have a centrifuge retention capacity of at least 20 g/g and a free swell gel bed permeability of at least 20 Darcies and/or a saline flow conductivity of at least 30×10 −7 cm 3 s/g.

15. The fluid-absorbent article, comprising
(A) an upper liquid-pervious layer,
(B) a lower liquid-impervious layer and
(C) a fluid-absorbent core according to claim 1 between the layer (A) and the layer (B),
(D) an optional acquisition-distribution layer between (A) and (C),
(E) an optional tissue layer disposed immediately above and/or below (C); and
(F) other optional components.

Assignees

• Zhang Xiaomin
• Mitchell Michael A
• Basf Se

Inventors

• Zhang Xiaomin
• Mitchell Michael A

Classifications

• A61F2013/530547

  positioned in a separate layer or layers · CPC title

• A61F13/53 Primary

  characterised by the absorbing medium (A61F13/20 takes precedence) · CPC title

• A61L15/22

  containing macromolecular materials · CPC title

• A61L15/60 Primary

  Liquid-swellable gel-forming materials, e.g. super-absorbents · CPC title

• A61F2013/530708

  characterized by the absorbency properties · CPC title