CD extensible nonwoven composite

Patent metadata

Field	Value
Publication number	US-11634844-B2
Application number	US-201515517543-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Dec 19, 2014
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

A nonwoven composite that has a dimension in a machine direction and a cross-machine direction is provided. The composite comprises a nonwoven facing positioned adjacent to an elastic film. The nonwoven facing contains a spunbond web that is formed by necking a base spunbond web. The base spunbond web includes a plurality of fibers generally oriented in the machine direction and exhibiting a machine direction tensile strength and cross-machine direction tensile strength. The ratio of the machine direction tensile strength to the cross-machine direction tensile strength is about 4:1 or more.

First claim

What is claimed is:

1. A nonwoven composite having a dimension in a machine direction and a cross-machine direction, the nonwoven composite comprising a nonwoven facing positioned adjacent to an elastic film, the nonwoven facing containing a necked spunbond web comprising a base spunbond web formed from a plurality of fibers that are generally oriented in the machine-direction, wherein the fibers contain a polymer composition that includes a fatty acid derivative,
wherein the base spunbond web has a machine direction tensile strength and cross-machine direction tensile strength, the ratio of the machine direction tensile strength to the cross-machine direction tensile strength being 3:1 or more;
wherein the composite has a peak elongation in the cross-machine direction of 100% or more and experiences a load at 100% elongation in the cross-machine direction of 450 grams-force per inch (177.16 grams-force per centimeter) or less; and
wherein the fibers are bonded together at multiple bond regions that are arranged in separate rows along the machine direction and spaced apart in the cross-machine direction within an individual row, wherein at least a portion of the bond regions are generally oriented in the machine direction.

2. The nonwoven composite of claim 1 , wherein the composite exhibits a load loss of 60% or less in the cross-machine direction.

3. The nonwoven composite of claim 1 , wherein the polymer composition includes a ductile polymer having a modulus of elasticity of 800 MPa or less as determined in accordance with ASTM D638-10.

4. The nonwoven composite of claim 3 , wherein the fibers are bicomponent fibers containing a low modulus component that includes the ductile polymer.

5. The nonwoven composite of claim 3 , wherein the fibers are monocomponent fibers.

6. The nonwoven composite of claim 3 , wherein the ductile polymer is an ethylene polymer.

7. The nonwoven composite of claim 3 , wherein the ductile polymer is a propylene homopolymer.

8. The nonwoven composite of claim 3 , wherein the ductile polymer is a copolymer of propylene and an α-olefin.

9. The nonwoven composite of claim 3 , wherein the polymer composition further contains a propylene homopolymer having a modulus of elasticity of from 800 MPa to 4,000 MPa as determined in accordance with ASTM D638-10.

10. The nonwoven composite of claim 1 , wherein at least a portion of the bond regions have an aspect ratio of from 2 to 100.

11. The nonwoven composite of claim 1 , wherein the elastic film contains a semi-crystalline polyolefin, a substantially amorphous block copolymer, or a combination thereof.

12. The nonwoven composite of claim 1 , wherein the elastic film is laminated to the spunbond web at multiple bond regions, wherein at least a portion of the elastic film to spunbond web bond regions are generally oriented in the machine direction.

13. The nonwoven composite of claim 12 , wherein at least a portion of the elastic film to spunbond web bond regions have an aspect ratio of from 2 to 100.

14. An absorbent article comprising the nonwoven composite of claim 1 .

Assignees

• Kimberly Clark Co

Inventors

• Conrad John H
• Fitts Jr James R

Classifications

• D04H3/04 Primary

  in rectilinear paths, e.g. crossing at right angles · CPC title

• A61F13/15699

  Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs · CPC title

• A61F13/51

  characterised by the outer layers of the pads (A61F13/20 takes precedence) · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B2307/54

  Yield strength; Tensile strength · CPC title