Internally separable tape laminate

• US 6,004,642 A
• Filed: 11/08/1996
• Issued: 12/21/1999
• Est. Priority Date: 11/08/1996
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Langford, Nathaniel P.
• Primary Examiner(s): Ahmad, Nasser
• Application Number:
  US08/746,351
• Time in Patent Office: 1,138 Days
• Field of Search: 428/40.1, 428/42.2, 428/42.3, 428/507, 428/308.8, 428/317.7, 248/467, 248/205.3
• US Class Current: 428/40.1
• CPC Class Codes: C09J 2301/308 the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
• CPC Class Codes: C09J 7/20 characterised by their carriers
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/149 Sectional layer removable
• CPC Class Codes: Y10T 428/1495 Adhesive is on removable layer
• CPC Class Codes: Y10T 428/249959 Void-containing component is wood or paper
• CPC Class Codes: Y10T 428/249985 Composition of adhesive or bonding component specified
• CPC Class Codes: Y10T 428/3188 Next to cellulosic

Abstract

A tape laminate comprising an internally separable layer having first and second opposite major anchor surfaces, which separable layer has an internal static shear strength in a direction parallel to its anchor surfaces that allows it to support a significant weight (e.g., at least 6 pounds per square inch), and has an internal dynamic tensile strength in a direction generally normal to its anchor surfaces of no greater than 40 pounds per square inch. The major anchor surfaces of the separable layer are bonded to the opposed surfaces of objects (which bonding can be done with strips of stretch release adhesive) so that the laminate can support one object from the other against a static force generally parallel to said anchor surfaces of at least 6 pounds per square inch, whereas the separable layer can be internally separated by a dynamic separating force normal to said anchor surfaces of no greater than about 40 pounds per square inch to separate the objects.

Claims

1. A tape laminate comprising an internally separable layer having first and second opposite anchor surfaces, and means for bonding said anchor surfaces to the opposed surfaces of objects so that the laminate can support one object from the other against a static force generally parallel to said anchor surfaces, whereas the separable layer can be internally separated by a dynamic separating force normal to said anchor surfaces to separate the objects, said means for bonding comprising at least one strip having opposite ends, inner and outer opposite major surfaces extending between said ends with a portion of said outer major surface being defined by pressure sensitive adhesive and said inner major surface being bonded to one of said anchor surfaces, and a manually engageable tab portion at one end, said strip being stretchable by being pulled at said tab portion to release adhesive engagement of said outer major surface to a substrate to which said outer major surface is adhered, so that alter the tape laminate has attached two objects together with the adhesive on the outer major surface of said strip adhered to one of the objects and the second anchor surface of the separable layer bonded to the other, and the separable layer has been internally separated by a dynamic separating force to separate the objects, the strip can be stretched by manually engaging the tab portion to separate the strip from the object to which it was adhered.

2. A tape laminate according to claim 1 wherein said means for bonding comprises two strips each having opposite ends, inner and outer opposite major surfaces extending between said ends with a portion of said outer major surface being defined by pressure sensitive adhesive and said inner major surface being bonded to a different one of said anchor surfaces, and a manually engageable tab portion at one end, said strips each being stretchable by being pulled at said tab portion to release adhesive engagement of said outer major surface to a substrate to which said outer major surface is adhered, so that after the tape laminate has attached two objects together with the adhesive on the outer major surface of each of said strips adhered to a different one of the objects, and the separable layer has been internally separated by a dynamic separating force to separate the objects, the strips can both be stretched by manually engaging said tab portions to separate the strips from the object to which they were adhered.

3. A tape laminate according to claim 1 wherein said separable layer has a dynamic internal strength in a direction generally normal to said anchor surfaces of no greater than about 40 pounds per square inch.

4. A tape laminate according to claim 1 wherein said separable layer has a dynamic internal strength in a direction generally normal to said anchor surfaces in the range of about 8 to 30 pounds per square inch.

5. A tape laminate according to claim 1 wherein the force required to separate said separable layer when applied in a direction generally normal to said anchor surfaces is no greater than about 10 pounds.

6. A tape laminate according to claim 1 wherein said separable layer is a nonwoven layer primarily of thermoplastic fibers.

7. A tape laminate according to claim 6 wherein said thermoplastic fibers are of one or more materials selected from the materials consisting, essentially of polyethylene, polypropylene, polyester, nylon, rayon and polyurethane.

8. A tape laminate according to claim 1 wherein said separable layer comprises materials consisting essentially of polymeric foam, cellulose material, and corrugated paper.

9. A tape laminate according to claim 1 wherein said strip comprises a layer of pressure sensitive adhesive defining said inner and outer major surfaces.

10. A tape laminate according to claim 2 wherein said strips each comprise a layer of pressure sensitive adhesive defining said inner and outer major surfaces.

11. A tape laminate according to claim 1 wherein said strip comprises a layer of pressure sensitive adhesive defining said outer major surface, and a layer of polymeric material having a major surface to which said layer of pressure sensitive adhesive is adhered.

12. A tape laminate according to claim 2 wherein said strips each comprise a layer of pressure sensitive adhesive defining said outer major surface, and a layer of polymeric material having a major surface to which said layer of pressure sensitive adhesive is adhered.

13. A tape laminate according to claim 1 wherein said strip comprises a layer of pressure sensitive adhesive defining said outer major surface, a first layer of stretchable polymeric material having opposite major surfaces with one major surface of the first layer of stretchable polymeric material bonded to said layer of pressure sensitive adhesive, a layer of polymeric foam having opposite major surfaces with one major surface of said layer of foam bonded on the surface of said first layer of polymeric material opposite said layer of pressure sensitive adhesive, and a second layer of polymeric material having opposite major surfaces with one of the major surfaces of said second layer of polymeric material adhered to the major surface of said layer of foam opposite said first layer of polymeric material.

14. A tape laminate according to claim 2 wherein said strips each comprise a layer of pressure sensitive adhesive defining said outer major surface, a first layer of stretchable polymeric material having opposite major surfaces with one major surface of the first layer of stretchable polymeric material bonded to said layer of pressure sensitive adhesive, a layer of polymeric foam having opposite major surfaces with one major surface of said layer of foam bonded on the surface of said first layer of polymeric material opposite said layer of pressure sensitive adhesive, and a second layer of polymeric material having opposite major surfaces with one of the major surfaces of said second layer of polymeric material adhered to the major surface of said layer of foam opposite said first layer of polymeric material.

15. A tape laminate according to claim 1 wherein said separable layer has an internal static shear strength in a direction parallel to said anchor surfaces that is about equal to or exceeds the maximum static shear strength that said layer of pressure sensitive adhesive can develop with normal surfaces.

16. An internally separable tape laminate which can be removably affixed between opposed support surfaces, comprising:

(a) a nonwoven internally separable layer formed primarily of thermoplastic fibers, said separable layer having opposite major surfaces; and

(b) a stretch releasing adhesive bonding strip arranged on at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom, thereby allowing the tape laminate to be cleanly removed from the support surface.

17. A tape laminate according to claim 16 wherein said thermoplastic fibers are one or more materials selected from the materials consisting essentially of polyethylene, polypropylene, polyester, nylon, rayon, and polyurethane.

18. An internally separable tape laminate which can be removably affixed between opposed support surfaces, comprising:

(a) an internally separable layer having opposite major surfaces; and

(b) a stretch releasing adhesive bonding strip adhesively bonded to at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom, thereby allowing the tape laminate to be cleanly removed from the support surface.

19. An internally separable tape laminate which can be removably affixed between opposing support surfaces, comprising:

(a) an internally separable layer having opposite major surfaces, said separable layer having an internal dynamic tensile strength in a direction generally normal to said major surfaces of no greater than 35 pounds per square inch when tested as described in this specification; and

(b) a stretch releasing adhesive bonding strip arranged on at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom, thereby allowing the tape laminate to be cleanly removed from the support surface.

20. An internally separable tape laminate which can be removably affixed between opposed support surfaces, comprising:

(a) an internally separable layer having opposite major surfaces; and

(b) a stretch releasing adhesive bonding strip arranged on at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom, thereby allowing the tape laminate to be cleanly removed from the support surface.

21. An internally separable tape laminate as defined in claim 20, wherein said bonding strip includes a first end portion with an inner surface affixed to one of said separable layer opposite major surfaces and an outer adhesive surface adapted for attachment with one of the support surfaces, and a second end portion forming a manually engageable tab, said bonding strip further including:

(a) a central layer having opposite major surfaces;

(b) film layers bonded along said central layer opposite major surfaces and

(c) adhesive layers adhered along at least a portion of said film layers.

22. An internally separable tape laminate which can be removably affixed between opposed support surfaces, comprising:

(a) an internally separable layer having opposite major surfaces; and

(b) a stretch releasing adhesive bonding strip arranged on at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom, thereby allowing the tape laminate to be cleanly removed from the support surface, said bonding strip having a lengthwise elongation at break of from about 50% to about 1200%.

23. An internally separable tape laminate which can be removably affixed between opposed support surfaces, comprising:

(a) an internally separable layer having opposite major surfaces; and

(b) a stretch releasing adhesive bonding strip arranged on at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom after being stretched at an angle no greater than about 35°

from the support surface without the backing rupturing prior to the removal of the tape from the support surface and without leaving substantial pressure-sensitive adhesive residue on the support surface.

24. An internally separable tape laminate which can be removably affixed between opposed support surfaces, comprising:

(a) an internally separable layer having opposite major surfaces; and

(b) a stretch releasing adhesive bonding strip arranged on at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom, thereby allowing the tape laminate to be cleanly removed from the support surface, said stretch releasing strip comprising a single layer of pressure-sensitive adhesive.

25. An internally separable tape laminate which can be removably affixed between opposed support surfaces, comprising:

(a) an internally separable layer formed primarily of corrugated paper, said separable layer having opposite major surfaces; and

(b) a stretch releasing adhesive bonding strip arranged on at least one of said opposite major surfaces for adhering the tape laminate to one of the support surfaces and selectively releasing the tape laminate therefrom, thereby allowing the tape laminate to be cleanly removed from the support surface.