Fluid-absorbent article

Patent metadata

Field	Value
Publication number	US-12042365-B2
Application number	US-201816482045-A
Country	US
Kind code	B2
Filing date	Feb 12, 2018
Priority date	Feb 17, 2017
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A fluid-absorbent article includes an upper liquid-pervious layer (A), a lower liquid-impervious layer (B), a fluid-absorbent core (C) between (A) and (B) including at least 60% by weight of non-surface postcrosslinked fluid-absorbent polymer particles and not more than 40% by weight of fibrous material, based on the sum of non-surface postcrosslinked fluid-absorbent polymer particles and fibrous material. An acquisition-distribution layer (D) between (A) and (C) includes at least 90% by weight of synthetic fibers and not more than 10% by weight of cellulose based fibers, based on the sum of synthetic fibers and cellulose based fibers. The basis weight of the acquisition-distribution layer (D) is at least 70 gsm. The fluid-absorbent polymer particles have a saline flow conductivity (SFC) of less than 5×10−7 cm3s/g and an AUHL of less than 15 g/g. Preferably the acquisition-distribution layer (D) is a non-woven web including a three dimensional network of fibers.

First claim

The invention claimed is:

1. A fluid-absorbent article, comprising:
(A) an upper liquid-pervious layer;
(B) a lower liquid-impervious layer;
(C) a fluid-absorbent core between (A) and (B) comprising at least 60% by weight of non-surface-crosslinked fluid-absorbent polymer particles and not more than 40% by weight of fibrous material, based on a sum of non-surface-crosslinked fluid-absorbent polymer particles and fibrous material, wherein the non-surface-crosslinked fluid-absorbent polymer particles are internally crosslinked;
(D) an acquisition-distribution layer between (A) and (C) comprising at least 90% by weight of synthetic fibers and not more than 10% by weight of cellulose based fibers, based on a sum of synthetic fibers and cellulose based fibers; and
(E) an optional tissue layer disposed immediately above and/or below (C);
wherein a basis weight of the acquisition-distribution layer (D) is at least 80 gsm and the non-surface-crosslinked fluid-absorbent polymer particles have a saline flow conductivity (SFC) of less than 5×10 −7 cm 3 s/g and an AUHL of less than 15 g/g;
wherein the fluid-absorbent polymer particles have a centrifuge retention capacity of at least 35 g/g; and
wherein the acquisition-distribution layer (D) comprises at least two layers and wherein the acquisition-distribution layer (D) is a non-woven web comprising a three dimensional network of fibers and the network comprises bicomponent fibers and/or polyethylene fibers and/or polypropylene fibers and/or polyester fibers,
wherein the non-surface-crosslinked fluid-absorbent polymer particles have a level of extractable constituents of less than 8% by weight.

2. The fluid-absorbent article according to claim 1 , wherein the basis weight of the acquisition-distribution layer is at least 90 gsm.

3. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent polymer particles have a saline flow conductivity (SFC) of 3×10 −7 cm 3 s/g or less.

4. The fluid-absorbent article according to claim 1 , wherein the acquisition-distribution layer (D) is air-through bonded.

5. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent core comprises at least 80% by weight of the fluid-absorbent polymer particles.

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

7. The fluid-absorbent article according to claim 1 , wherein the fluid-absorbent polymer particles have a centrifuge retention capacity of at least 40 g/g.

8. The fluid-absorbent article according to claim 1 , wherein the non-surface-crosslinked fluid-absorbent polymer particles have a mean sphericity of at least 0.8.

9. The fluid-absorbent article according to claim 1 , wherein the non-surface-crosslinked fluid-absorbent polymer particles are internally crosslinked with an acrylated glyceryl crosslinker.

10. The fluid-absorbent article according to claim 1 , wherein the non-surface-crosslinked fluid-absorbent polymer particles have a level of extractable constituents of less than 5% by weight.

11. The fluid-absorbent article according to claim 1 , wherein the non-surface-crosslinked fluid-absorbent polymer particles have a level of extractable constituents of less than 3% by weight.

Assignees

• Basf Se

Inventors

• Daniel Thomas
• Bauduin Christophe
• Baumann Katrin
• Dobrosielska-Oura Katarzyna

Classifications

• A61L15/60 Primary

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

• A61F2013/530708

  characterized by the absorbency properties · CPC title

• A61F2013/530481

  having superabsorbent materials, i.e. highly absorbent polymer gel materials · CPC title

• A61F13/537 Primary

  characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer {(A61F13/538 takes precedence)} · CPC title

• A61F13/53

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