Fibrous structures

Patent metadata

Field	Value
Publication number	US-11414798-B2
Application number	US-202017015399-A
Country	US
Kind code	B2
Filing date	Sep 9, 2020
Priority date	Jul 17, 2007
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

Fibrous structures containing a mixture of three or more different fibrous elements (filaments and/or fibers) are provided.

First claim

What is claimed is:

1. A non-wet-laid layered fibrous structure comprising at least three layers, wherein the fibrous structure comprises:
a. a first layer comprising a non-thermoplastic first fibrous element comprising a hydroxyl polymer selected from the group consisting of: polyvinyl alcohol, polyvinyl alcohol derivatives, and mixtures thereof, wherein the first fibrous element exhibits a length of 10.16 cm or greater and a length to average diameter ratio of greater than 2000, wherein the first fibrous element is a first monocomponent filament;
b. a second fibrous element different from the first fibrous element, wherein the second fibrous element exhibits a length of less than 5.08 cm, wherein the second fibrous element is a wood pulp fiber; and
c. a third layer comprising a third fibrous element different from the first and second fibrous elements, wherein the third fibrous element comprising a hydroxyl polymer selected from the group consisting of: starch, starch derivatives, and mixtures thereof, wherein the third fibrous element exhibits a length of 10.16 cm or greater and a length to average diameter ratio of greater than 2000, wherein the third fibrous element is a second monocomponent filament.

2. The non-wet-laid layered fibrous structure according to claim 1 wherein the hydroxyl polymer of the first fibrous element exhibits a weight average molecular weight of greater than about 10,000 g/mol.

3. The non-wet-laid layered fibrous structure according to claim 1 wherein the first fibrous element exhibits an average diameter of less than 25 μm.

4. The non-wet-laid layered fibrous structure according to claim 1 wherein the first fibrous element exhibits an average diameter of less than 25 μm to greater than 1 μm.

5. The non-wet-laid layered fibrous structure according to claim 1 wherein the hydroxyl polymer of the third fibrous element exhibits a weight average molecular weight of greater than about 10,000 g/mol.

6. The non-wet-laid layered fibrous structure according to claim 5 wherein the hydroxyl polymer of the third fibrous element exhibits a weight average molecular weight of greater than about 100,000 g/mol.

7. The non-wet-laid layered fibrous structure according to claim 1 wherein the hydroxyl polymer of the third fibrous element exhibits a weight average molecular weight of from about 10,000 g/mol to about 40,000,000 g/mol.

8. The non-wet-laid layered fibrous structure according to claim 1 wherein the third fibrous element exhibits an average diameter of less than 25 μm.

9. The non-wet-laid layered fibrous structure according to claim 8 wherein the third fibrous element exhibits an average diameter of less than 10 μm.

10. The non-wet-laid layered fibrous structure according to claim 1 wherein the third fibrous element exhibits an average diameter of less than 25 μm to greater than 1 μm.

11. A non-wet-laid layered fibrous structure comprising at least three layers, wherein the fibrous structure comprises:
a. a first layer comprising a non-thermoplastic, non-cellulose-containing, first fibrous element comprising a starch filament that exhibits a length of 10.16 cm or greater;
b. a second layer comprising a second fibrous element different from the first fibrous element, wherein the second fibrous element exhibits a length of less than 5.08 cm, wherein the second fibrous element is a wood pulp fiber; and
c. a third layer comprising a third fibrous element different from the first and second fibrous elements, wherein the third fibrous element comprising a polyvinyl alcohol filament.

12. The non-wet-laid layered fibrous structure according to claim 11 wherein the starch filament comprises a starch that exhibits a weight average molecular weight of greater than about 10,000 g/mol.

13. The non-wet-laid layered fibrous structure according to claim 12 wherein the starch filament comprises a starch that exhibits a weight average molecular weight of greater than about 100,000 g/mol.

14. The non-wet-laid layered fibrous structure according to claim 11 wherein the starch filament comprises a starch that exhibits a weight average molecular weight of greater than about 10,000 g/mol to about 40,000,000 g/mol.

15. The non-wet-laid layered fibrous structure according to claim 11 wherein the starch filament exhibits an average diameter of less than 25 μm.

16. The non-wet-laid layered fibrous structure according to claim 15 wherein the starch filament exhibits an average diameter of less than 10 μm.

17. The non-wet-laid layered fibrous structure according to claim 11 wherein the starch filament exhibits an average diameter of less than 25 μm to greater than 1 μm.

18. The non-wet-laid layered fibrous structure according to claim 11 wherein the polyvinyl alcohol filament comprises a polyvinyl alcohol that exhibits a weight average molecular weight of greater than about 10,000 g/mol.

19. The non-wet-laid layered fibrous structure according to claim 11 wherein the polyvinyl alcohol filament exhibits an average diameter of less than 25 μm.

20. The non-wet-laid layered fibrous structure according to claim 11 wherein the polyvinyl alcohol filament exhibits an average diameter of less than 25 μm to greater than 1 μm.

Assignees

• Procter & Gamble

Inventors

• Cabell David William
• Trokhan Paul Dennis
• Barnholtz Steven Lee

Classifications

• D21H13/10

  Organic non-cellulose fibres · CPC title

• D04H5/02 Primary

  strengthened or consolidated by mechanical methods, e.g. needling (needling machines D04H18/00) · CPC title

• D21H27/002

  Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00) · CPC title

• D04H1/732

  by fluid current, e.g. air-lay · CPC title

• D04H1/435

  Polyesters · CPC title