Nonwoven cohesive wrap

• US 6,133,173 A
• Filed: 12/01/1997
• Issued: 10/17/2000
• Est. Priority Date: 12/01/1997
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Riedel, John E., Harper, Roberta C., Joseph, Eugene G.
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US08/980,921
• Time in Patent Office: 1,051 Days
• Field of Search: 442/400, 442/151, 442/328, 442/341, 442/347, 442/351, 442/361, 428/343, 428/356, 428/355 AC
• US Class Current: 442/400
• CPC Class Codes: A61F 13/0273 Adhesive bandages for winding around limb, trunk or head, e.g. cohesive
• CPC Class Codes: A61F 13/041 Accessories for stiffening bandages, e.g. cast liners, heel-pieces
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: D04H 1/4291 Olefin series
• CPC Class Codes: D04H 1/43 Acrylonitrile series
• CPC Class Codes: D04H 1/43828 sheath-core
• CPC Class Codes: D04H 1/4383 sea-island
• CPC Class Codes: D04H 1/43835 Mixed fibres, e.g. at least two chemically different fibres or fibre blends
• CPC Class Codes: D04H 1/43838 Ultrafine fibres, e.g. microfibres
• CPC Class Codes: D04H 1/559 the fibres being within layered webs
• CPC Class Codes: D04H 1/56 in association with fibre formation, e.g. immediately following extrusion of staple fibres
• CPC Class Codes: Y10T 442/2754 Pressure-sensitive adhesive
• CPC Class Codes: Y10T 442/601 Nonwoven fabric has an elastic quality
• CPC Class Codes: Y10T 442/615 Strand or fiber material is blended with another chemically different microfiber in the same layer
• CPC Class Codes: Y10T 442/626 Microfiber is synthetic polymer
• CPC Class Codes: Y10T 442/68 Melt-blown nonwoven fabric

Abstract

A dispensable nonwoven cohesive wrap that is generally dispensed from a self-wound roll. The nonwoven cohesive wrap comprises mutually entangled fibers at least some of which are pressure-sensitive adhesive fibers. The cohesive wrap also generally has a basis weight of from 40 to 200 grams/m², a tensile strength of at least 100 grams/2.5 cm and a T-peel from itself of from 1 to 30 grams/2.5 cm. The wrap is preferably a single layer material without a separate adhesive coating or release coating where the adhesive fibers extend through the entire depth dimension of the wrap, such that a portion of the adhesive fibers are on both faces of the wrap, and preferably are uniformly distributed across the length and width dimensions of the wrap.

Claims

1. A dispensable nonwoven cohesive wrap comprising a coherent self-supporting web comprising entangled pressure-sensitive adhesive fibers and a non-pressure-sensitive adhesive fibrous material, the wrap having a tensile strength of at least 100 grams/2.5 cm and a T-peel from itself from 1 to 30 grams/2.5 cm.

2. The nonwoven cohesive wrap of claim 1 wherein the wrap has an elastic recovery of at least 40 percent at an elongation of 50 percent.

3. The nonwoven cohesive wrap of claim 2 wherein the wrap has a force at 50 percent elongation of at least 75 grams/2.5 cm.

4. The nonwoven cohesive wrap of claim 3 wherein the force at 50 percent elongation is less than 1000 grams/2.5 cm.

5. The nonwoven cohesive wrap of claim 3 wherein the force at 50 percent elongation is from 150 to 200 grams/2.5 cm.

6. The nonwoven cohesive wrap of claim 3 wherein the force at 50 percent elongation is from 200 to 400 grams/2.5 cm.

7. The nonwoven cohesive wrap of claim 1 wherein the wrap has a basis weight of from 40 to 200 grams/m².

8. The nonwoven cohesive wrap of claim 7 wherein the basis weight of the wrap is from 40 to 80 grams/m².

9. The nonwoven cohesive wrap of claim 3 wherein the tensile strength of the wrap is less than 2000 grams/2.5 cm.

10. The nonwoven cohesive wrap of claim 3 wherein the tensile strength of the wrap is from 150 to 650 grams/2.5 cm.

11. The nonwoven cohesive wrap of claim 3 wherein the tensile strength of the wrap is from 250 to 400 grams/2.5 cm and wherein the wrap has a basis weight of from 50 to 80 grams/m².

12. The nonwoven cohesive wrap of claim 3 wherein the wrap has an elongation at break of from 100 to 900 percent.

13. The nonwoven cohesive wrap of claim 3 wherein the wrap has an elongation at break of from 200 to 700 percent.

14. The nonwoven cohesive wrap of claim 3 wherein the wrap has an elongation at break of from 250 to 400 percent.

15. The nonwoven cohesive wrap of claim 3 wherein the wrap has an elastic recovery force of at least 50 grams/2.5 cm at 50 percent elongation.

16. The nonwoven cohesive wrap of claim 15 wherein the wrap recovers at least 80 percent at 50 percent elongation.

17. The nonwoven cohesive wrap of claim 15 wherein the wrap recovers at least 90 percent at 50 percent elongation.

18. The nonwoven cohesive wrap of claim 3 wherein the T-peel from itself is from 1 to 10 grams/2.5 cm.

19. The nonwoven cohesive wrap of claim 3 wherein the T-peel from itself is from 3.5 to 8 grams/2.5 cm.

20. The nonwoven cohesive wrap of claim 1 wherein the wrap can be readily torn by hand.

21. The nonwoven cohesive wrap of claim 1 wherein the wrap comprises commingled pressure-sensitive adhesive fibers and non-pressure-sensitive adhesive fibers.

22. The nonwoven cohesive wrap of claim 1 wherein the wrap pressure-sensitive adhesive fibers comprise a blend of a pressure-sensitive adhesive phase and a thermoplastic phase.

23. The nonwoven cohesive wrap of claim 1 wherein the pressure-sensitive adhesive fibers have two or more layers along the length of the fibers at least one layer being a pressure-sensitive adhesive layer forming at least a portion of the outer surface of the fiber and at least one second layer of a thermoplastic material.

24. The nonwoven cohesive wrap of claim 23 wherein the layers are side by side.

25. The nonwoven cohesive wrap of claim 23 wherein the layers are concentric.

26. The nonwoven cohesive wrap of claim 23 wherein the layers are coextensive and continuous along the length of the fiber.

27. The nonwoven cohesive wrap of claim 26 wherein there are at least three alternating layers.

28. The nonwoven cohesive wrap of claim 1 wherein the web is formed of melt blown pressure-sensitive adhesive fibers.

29. The nonwoven cohesive wrap of claim 1 wherein the web is formed of spunbond pressure-sensitive adhesive fibers.

30. The nonwoven cohesive wrap of claim 1 wherein the pressure-sensitive adhesive fibers have an average diameter of less than about 50 microns.

31. The nonwoven cohesive wrap of claim 1 wherein the wrap consists essentially of a single layer nonwoven web comprising the entangled pressure-sensitive adhesive fibers.

32. The nonwoven cohesive wrap of claim 1 wherein the pressure-sensitive adhesive is a tackified rubber-resin adhesive.

33. The nonwoven cohesive wrap of claim 32 wherein the tackified rubber-resin adhesive comprises an A-B type block copolymer and a compatible resin.

34. The nonwoven cohesive wrap of claim 1 wherein the pressure-sensitive adhesive comprises a polyalphaolefin.

35. The nonwoven cohesive wrap of claim 1 wherein the pressure-sensitive adhesive comprises an acrylate pressure-sensitive adhesive.

36. The nonwoven cohesive wrap of claim 1 wherein the wrap is in the form of a roll.