ASYMMETRIC ELASTIC FILM NONWOVEN LAMINATE

• US 20080241476A1
• Filed: 03/30/2007
• Published: 10/02/2008
• Est. Priority Date: 03/30/2007
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: OLGUIN, SAUL BRIONES
• Application Number:
  US11/693,785
• Publication Number:
  US 20080241476A1
• Time in Patent Office: Days
• US Class Current: 428/152
• CPC Class Codes: B32B 5/02 characterised by structural features of a fibrous or filamentary layer layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02
• CPC Class Codes: B32B 7/14 applied in spaced arrangements, e.g. in stripes
• CPC Class Codes: Y10T 428/24446 Wrinkled, creased, crinkled or creped
• CPC Class Codes: Y10T 442/679 Natural or synthetic rubber sheet or film

Abstract

An elastic nonwoven laminate comprising an elastic film layer extrusion laminated along at least one face to an asymmetric nonwoven web. The elastic film layer is extrusion laminated along a plurality of cross direction extending bond lines were the asymmetric nonwoven fibers are at least partially embedded into the extruded elastic film. The asymmetric nonwoven webs are preferably bonded to both faces of the elastic film layer where the bond lines are 0.1 to 2.0 mm wide and there are from 0.5 to 10 bond lines/cm.

Claims

1. A cross directionally elastically extensible nonwoven laminate comprising:

an elastic film layer autogenously bonded along at least one face to an asymmetric nonwoven web along a plurality of cross direction extending bond lines where the asymmetric nonwoven fibers are at least partially embedded into the elastic film along the bond lines, the elastic film layer is morphologically substantially the same at the bond lines as between the bond lines and the elastic film layer remains substantially elastic at the bond lines and wherein the asymmetric nonwoven web ratio of machine direction tensile strength to cross direction tensile strength is at least 4.

2. The cross directionally elastically extensible nonwoven laminate of claim 1, wherein there is an asymmetric nonwoven web bonded to both faces of the elastic film layer.

3. The cross directionally elastically extensible nonwoven laminate of claim 2, wherein the bond lines are from 0.1 to 2.0 mm wide and there are from 0.5 to 10 bond lines/cm.

4. The cross directionally elastically extensible nonwoven laminate of claim 3, wherein the bond lines are from 0.5 to 1.5 mm wide and there are from 1 to 5 bond lines/cm.

5. The cross directionally elastically extensible nonwoven laminate of claim 3, wherein the asymmetric nonwoven is substantially unbonded to the elastic film between the bond lines.

6. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven has a basis weight of from 10 to about 50 g/m² and wherein the asymmetric nonwoven web ratio of machine direction tensile strength to cross direction tensile strength is from 4 to 20.

7. The cross directionally elastically extensible nonwoven laminate of claim 6, wherein the basis weight of the elastomeric film is from 30 to 100 g/m² and the basis weight of the asymmetric nonwoven is from 10 to 20 g/m².

8. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven has a CD tensile force at break of less than 750 grams force per 50 mm.

9. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven has a CD tensile force at break of less than 600 grams force per 50 mm.

10. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven has a MD tensile force at break of greater than 1000 grams force per 50 mm.

11. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven has a MD tensile force at break of greater than 2000 grams force per 50 mm.

12. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven is a carded nonwoven.

13. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven is an unbonded carded nonwoven.

14. The cross directionally elastically extensible nonwoven laminate of claim 5, wherein the asymmetric nonwoven is a bonded carded nonwoven.

15. The cross directionally elastically extensible nonwoven laminate of claim 1, wherein the bond lines extend continuously across the laminate.