MXPA98001047A

MXPA98001047A - Removable adhesive tape with sequential control control

Info

Publication number: MXPA98001047A
Application number: MXPA/A/1998/001047A
Authority: MX
Inventors: L Bries James; D Hamerski Michael
Original assignee: Minnesota Mining And Manufacturing Company
Priority date: 1995-08-11
Filing date: 1998-02-06
Publication date: 1998-10-23

Abstract

Double-sided stretchable adhesive tapes are disclosed for use in conventional applications, including particularly mounting or joining an object to another surface. An improvement is within the ability to control the timing of detachment on both surfaces, so that one adhesive surface comes off before the other. The first detachment can be either on the side of the object or on the side of the surface, depending on the desired effect. The present invention is applicable to all stretchable tape constructions including the use of plastic backing materials and / or backing materials elastic and allows such an object to be removed without substantial risk of re-adhesion of the adhesive tape or catapulting of the object. The above-mentioned advantages can be achieved with a two-sided adhesive tape having a stretchable, plastic or elastic backing layer, and having a low adhesion or a non-adhesive portion of an adhesive surface, so that a larger adhesive adhesion portion corresponding on the other side remains more aggressively adhered to a surface during the expansion by dilation while the portion of the adhesive surface is aggressively adhered or completely detached from its surface. A non-adhesive portion may be free of adhesive, or it may be a portion of an adhesive layer that has become non-adhesive. A lower adhesion portion may comprise a lower adhesion material, i.e., a weak adhesive, or may become less adhesive by treatment or coating.

Description

REMOVABLE ADHESIVE TAPE WITH CONTROLLED SEQUENTIAL DETACHMENT TECHNICAL FIELD The present invention relates to adhesive tapes which can adhere to a surface and subsequently be removed without substantially damaging the surface or leaving substantial residues of adhesive. More particularly, the present invention includes controlled sequential detachment of adhesive surfaces from a two-sided stretchable adhesive tape product.

BACKGROUND OF THE INVENTION Adhesive products have been designed which were specifically created to increase their ability to be removed from the substrate before being adhered to such a substrate without substantially damaging the surface of the substrate or leaving residues of substantial adhesives on it. The products include items such as paper notes that have an easily removable adhesive layer adhered to a surface, such as the Post-itR Notes products available from the Minnesota Mining and Manufacturing Company of REF: 26681 Saint Paul, Minnesota. It is also known to provide two-sided adhesive products including similar easily removable adhesives. Another type of product that has recently been developed is a single sided or double sided adhesive tape having a conventional pressure sensitive adhesive on one or both larger surfaces thereof, and including a tape backing comprising a material highly stretchable See, for example, European Patent Application 92,903259.7. These tapes operate so that when the backing is stretched after the tape has been adhered on one or both sides, the adhesive is stretched and experiences a clean interfacial detachment from the substrate or substrates to which it adheres. Such removal typically progresses from one end of the belt to the other when the belt support is stretched at an angle preferably no greater than about 35 ° from the surface to the substrate. That is, when the tape is stretched from one end, it detaches from the end that is stretched towards its distal end. The adhesive tapes described in the aforementioned European Patent Application 92,903259 include plastic supports. This means that, when the support is stretched, it is permanently deformed and has a relatively low elastic recovery. The described tapes include single-sided tapes, two-sided tapes, and tapes comprising film layers, foam layers and film sheets and / or foams. In two-sided adhesive tape constructions, both surfaces come off at the same time and progress substantially at the same speed from the stretched end towards the distal end when the tape support is stretched. US Patent Application Serial No. 08 / 308,937, which is commonly owned by the assignee of the present invention, discloses a number of removable, stretchable tapes comprising film constructions, foams and film sheets and / or foams. Again, such tapes include conventional pressure sensitive adhesives. Another type of removable, stretchable adhesive tape is disclosed in U.S. Patent Application Serial No. 5,409,189 to Lühmann, wherein the adhesive tape backings used comprise elastic materials. Elastic, as opposed to the plastic materials described above, means that they are stretchable without substantial plastic deformation having high elastic recovery after stretching and peeling. Like the plastic tapes described above, the elastic tapes can be single-sided or double-sided and the stretching of the backing causes the stretching of the adhesive and the consequent detachment of the surface or adhesive surfaces of the stretched end to the distal end when the Ribbon is stretched. Double-sided adhesive tapes are particularly useful for joining and mounting applications. The tape with two removable sides, Stretchable provide a secure joint to both surfaces with clean removal of both surfaces without damage or substantial adhesive residues. One problem is that such two-sided adhesive tapes are simultaneously deduced from both adhered sides when the tape is stretched for removal. In applications where these tapes are used to adhere an object to a wall or other surface, the detachment of both the object and the other surface at the same time may cause the adhesive tape to meet in the direction of stretching, similar to the effect of reattachment in a stretched rubber band, or it can cause the object to be catapulted, particularly if the object is held while it is being removed. This re-adhesion of the tape occurs at the point of release of the adhesive when the strength of the adhesion to the wall drops suddenly to zero. This effect is exacerbated by the properties of elasticity or recovery of the tape.

It is known that the stretchable tapes described above are applicable for many applications including the assembly of objects, such as hooks or other fastening devices, to walls, etc .; joint or assembly applications; damping or sound deadening applications; closure applications, such as container closures, such as for example case closures, food and beverage containers; and removable labels.

Brief Description of the Invention The present invention provides an improvement to double-sided stretchable adhesive tapes for use in conventional applications, including particularly the assembly or joining of an object to another surface. The improvement is within the ability to control the synchronization of the re-adhesion of both surfaces so that one adhesive surface comes off before the other. In this way, the problem mentioned above can be reduced to a minimum. The detachment can be first either on the side of the object or on the side of the surface, depending on the desired effect. In addition, the present invention is applicable to all stretchable tape constructions, including the use of plastic backing materials and / or elastic backing materials. In any case, the improvement allows such an object to be removed without jeopardizing the substantial redistribution of the adhesive tape or catapulting the object. The tape constructions according to the present invention are those in which the side to side detachment of the tape is sequential, ie one side of the tape completes the detachment before detachment from the opposite side of the tape. The aforementioned advantages can be achieved by a two-sided adhesive tape comprising a solid adhesive, or having a stretchable, plastic or elastic backing layer, and having a non-adhesive portion of low adhesion of an adhesive surface, of so that a correspondingly greater adherent adhesive portion of the other side remains more aggressively adhered to a surface during the stretch removal, while the portion of the adhesive surface is adhered less aggressively or completely detached from its surface. A non-adhesive portion may be free of adhesive, or it may be a portion of adhesive layer that became non-adhesive. A low adhesion portion may comprise a low adhesion material, i.e. a weaker adhesive, or may become lower in adhesion by a treatment or coating. More particularly, a release strip is preferably used to cushion the adhesive on the side to be placed adjacent the effective end of the object or the end of the surface to which the adhesive tape is to be applied. With the use of such a release strip, one side is completely detached from its bonded surface before completing the detachment from the other side. The non-adhesive portion of the adhesive surface may become non-adhesive, as noted above, by providing such a release strip, or such portion may simply be free of adhesive. Useful alternatives for release strips include films, papers, powders, foams, inks or other coatings or treatments, and the like, which can be used to make a non-stick adhesive layer. Thus, according to the present invention there is provided a tape adapted to join a first and second structures together. The tape has first and second opposite ends spaced in a first direction, first and second opposed primary surfaces extending between those ends, a manually manageable tongue portion adjacent its first end, and a joining portion between its manually operable portion and its second extreme. The attachment portion comprises an aggressive, pressure sensitive adhesive layer that provides an adhesively aggressive portion of each of the outer surfaces. Each adhesively aggressive portion has a primary end adjacent to the first end of the tape, a secondary end adjacent the second end of the belt and adapted to firmly adhere to a different one of the structures between its primary and secondary ends. The joint portion is stretchable so that the joint portion when it is between and is adhered to the structures may be stretched progressively along its length by manual application of force to the manually operable portion to cause separation of the portions. of adhesively aggressive surface of the structures progressively from their primary ends towards their secondary ends. The secondary ends of the adhesively aggressive surface portions are separated from each other in the first direction to cause separation of one of the portions of the adhesively aggressive surface from one of the structures before separation of the other from the portions of the surface. adhesively aggressive of the other of the structures. The tape may comprise a single layer of pressure-sensitive adhesive that provides both adhesively aggressive portions of the external surfaces and that includes a masking layer of material that has no adhesive properties or that has adhesive properties that are significantly reduced from the adhesive layer pressure sensitive adjacent the second end of the belt and extending over a portion of the pressure sensitive adhesive layer defining one of the adhesively aggressive portions of the outer surfaces to separate the secondary ends of the adhesively aggressive portions of the adhesive. the external surfaces between them. This material in the masking layer can, for example, be a release liner material, repositionable pressure sensitive adhesive, polymeric film, or low adhesion filler material. Preferably, the tape includes a stretchable polymeric support layer having an aggressive, pressure sensitive adhesive layer along each of its opposed major surfaces defining one of its adhesively aggressive portions of its outer surfaces. That polymeric support layer may, for example, be polymeric film, polymeric foam, polymeric film laminated to polymeric foam, or two layers of polymeric film laminated on opposite sides of a polymeric foam layer. With such support, the ends adjacent to the second end of the tape of the layers of the aggressive pressure sensitive adhesive, on both major surfaces of the support layer may extend to the same place with respect to the second end of the tape, and the tape may include a masking layer of material that has no adhesive properties or that has adhesive properties that are significantly reduced from the layer of pressure sensitive adhesive adjacent the second end of the tape and extending over a portion of one of the layers of aggressive adhesive to separate the secondary ends of the adhesively aggressive portions of the outer surfaces from each other. Alternatively, the ends adjacent to the second end of the tape of the aggressive adhesive layers on both major surfaces of the support layer can define the secondary ends of the adhesively aggressive portions of the outer surfaces and can extend to different places with respect to to the second end of the tape to separate the secondary ends of the adhesively aggressive portions of the outer surfaces from each other. Alternatively, one assembly that causes one adhesive surface to peel off before the other may comprise first and second tape joining structures each in which the first structure has a back surface portion adapted to adhere so as to extend to an edge at which the ends of the back surface or along which the back surface may not adhere (i.e. due to surface treatments such as release material or surface texture). The tape has first and second opposite ends separated in a first directionfirst and second opposed primary external surfaces extending between their ends, a manually manageable tongue portion adjacent its first end, and a joining portion between its manually operable portion and its second end. The attachment portion comprises a layer of aggressive, pressure-sensitive adhesive that provides an adhesively aggressive portion of each of the outer surfaces, each adhesive-aggressively portion having a primary end adjacent to the first end of the tape / an adjacent secondary end. to the second end of the tape and it is firmly attached to a different one of the structures. The adhesively aggressive portion adhered to the first structure adheres to its rear surface with the edge separated in the first direction of the primary end of the adhesively aggressive portion adhered to the second structure with the adhesive aggressively portion adhered to the second structure at its secondary end . The joint portion is stretchable, so that the joint portion between and adhered to the structures can be stretched progressively along its length by manual application of force to the manually operable portion to cause separation of the surface portions. adhesively aggressive structures progressively from their primary ends to their secondary ends. The separation between the edge and the secondary end of the adhesively aggressive surface portion adhered to the second structure causes the separation of the adhesive-aggressively surface portion from the first structure before the separation of the other from the adhesively aggressive-surface portions. of the second structure.

Brief Description of the Drawings FIGURE 1 is an enlarged cross-sectional side view of a first embodiment of an adhesive tape construction according to the present invention; FIGURE 2 is an enlarged cross-sectional side view of an alternative construction of the adhesive tape of Figure 1; FIGURE 3 is an enlarged cross-sectional side view of yet another alternative construction of the adhesive tape of Figure 1; FIGURE 4 is an enlarged cross-sectional side view of the adhesive tape construction of Figure 2 shown adhered between a substrate and an assembled object; FIGURE 5 is an elongated cross-sectional side view of the adhesive tape construction of Figure 2 shown between a substrate and an assembled object as in Figure 4, but with a release strip included in the construction of tape placed against the object mounted instead of against the substrate; FIGURE 6 is an enlarged cross-sectional side view of the construction of adhesive tape, substrate, and assembled object as shown in Figure 5, but with a support layer in the partially stretched tape construction and just before any detachment of adhesive layers included in the tape construction; FIGURE 7 is an elongated cross-sectional side view similar to that of Figure 6, but with the support layer stretched further and with both adhesive layers partially detached from the substrate and the assembled object; FIGURE 8 is an enlarged cross-sectional side view showing a further stripping step after that shown in Figure 7, wherein the adhesive layer that adhered to the assembled object is fully peeled away while a corresponding portion of the adhesive layer which Adheres to the surface of the substrate remains still adhered; FIGURE 9 is an enlarged cross-sectional side view of a second embodiment of an adhesive tape construction according to the present invention comprising a film / foam sheet; FIGURE 10 is an enlarged cross-sectional side view of a third embodiment of a tape, adhesive construction according to the present invention comprising a foil sheet / film / film; FIGURE 11 is an enlarged cross-sectional side view of a fourth embodiment of an adhesive tape construction according to the present invention comprising a foam / film / foam sheet; FIGURE 12 is an enlarged cross-sectional side view of a fifth embodiment of an adhesive tape construction according to the present invention comprising a film / foam / film sheet; and FIGURE 13 is an elongated cross-sectional side view of the sequential detachment tape construction according to the present invention showing an alternative mounting application.

Detailed Description of the Preferred Modalities With reference to the Figures, where similar numbers were used to designate similar component again, and initially to Figures 1-3, a first construction of adhesive tape will be described. The first adhesive tape construction 1 is particularly designed to stretch the entire tape 1 to effect detachment, as will be described more fully below. The tape 1 comprises a backing layer 12 and adhesive layers 14 and 16 of the same or different pressure sensitive adhesive compositions on the opposite major surfaces thereof. The adhesive layers 14 and 16 are preferably protected by coatings 18 and 20, respectively, before the adhesive tape 1 is put to use. As illustrated, the backing layer 12 comprises a layer of polymeric foam. The support layer 12 may alternatively comprise a polymeric film layer. The choice of polymeric foam or polymeric film depends on the specific application of the tape 1. The polymeric foams can be chosen to optimize the formability and elastic properties that are useful when the tape 10 is to be adhered to surfaces having surface irregularities. Such is the case with a typical wall surface. Polymeric films can be used instead to increase the load-bearing strength and resistance to tape breakage; however, the films are more suitable when the application is to adhere two very uniform surfaces together. As an alternative, solid adhesives can be used in place of the combination of a film or foam with two adhesive layers. Known stretchable solid adhesives that are generally of an elastic and useful nature include solid adhesives based on rubber and acrylate based. A feature of the present invention that allows controlled sequential detachment, described below, is achieved by providing a detachment band 22, which is preferably positioned at the distal end or second end 24 of the tape 1 away from the portion of the tape. tongue 26 adjacent an opposite first end of the tape 1. The tongue 26 provides means through which the support layer 12 can be held by a user to effect the release by stretching of the tape 1. The purpose of the band of detachment 22 is to provide a non-adhesive zone of one of the adhesive layers 14 or 16 at the effective or functional end (distal end or second 24 as shown in Figure 1) of the tape 1. According to the embodiment of the Figure 1, the peel band 22 may comprise a portion of the liner 18 that is simply cut from the liner 18 as shown in 28. In other words Thus, the release strip 22 may comprise the same material as the cover 18. Also, the release strip 22 preferably covers the entire transverse width of the tape 1, the purpose of which is to provide a non-adhesive zone, so that When the tape 1 is applied after the coatings 18 and 20 are removed, the release band 22 prevents the coated portion of adhesive 14 or 16 from adhering to any surface. Alternatively, as shown in the Figure 2, a tape 10 may comprise a release strip 30 provided separately to cover a portion of the adhesive layer 14 or 16. As shown, the release strip 30 covers a portion of the adhesive layer 14 and is provided separately from an adhesive layer. coating 32. The coating 32 is illustrated covering the release strip 30; however, the coating 32 'does not necessarily cover the release strip 30. The release strip 30 may comprise a peelable silicone paper, which may be the same as or different from the coating material 32, or may comprise the conventional material for returning a portion of the non-adhesive adhesive 14 or 16. Conventionally it is known how to use materials such as films, papers, powders, foams, inks, or other coatings and treatments, and the like as a layer or coating on the relevant portion of the adhesive to render that portion of the adhesive non-adhesive. Films that adhere strongly to the adhesive layer 14 or 16 are preferred since they do not peel off during application, and include polyester materials such as polyethylene terephthalate (PET). As an alternative to returning a portion of a non-adhesive adhesive layer, shown in the tape construction 10 'of Figure 3, a non-adhesive portion 34 can be provided by simply not coating the adhesive layer 36 along the entire length of the distal end 38 of the adhesive tape. As shown, the coating 40, which ends at the end of the adhesive layer 36, can also be preferably provided, although it can be extended further to cover the non-adhesive portion 34. A specific mounting or bonding application for the tape 10 , of Figure 2, according to the present invention, is shown in Figure 4. The tape 10 is shown placed between and adhered to a mounting object, specifically a hook 42 and a substrate, such as a wall, partially shown at 44. With reference to the tape construction 10 shown in Figure 2, the adhesive layer 16 is adhered to the hook 42 while the adhesive layer 14 is adhered to the wall 44. the adhesive layer 16 preferably corresponds to the surface of the hook 42 to which is adhered so that the tongue 26 extends from the hook 42 to facilitate the stretch removal of the tape 10. Similarly, the adhesive layer 14 is configured in a manner that a similar preferably. In this application, the detachment band 30 is positioned against a portion of the wall 44 which corresponds to an end portion of the hook 42 away from the tongue 26. As will be more readily understood with the following description, the assembly configuration of the Figure 4 will allow a sequential detachment of the two-sided adhesive tape structure 10 first from the wall 44 and then from the hook 42 during the stretch release. The stripping band 30 effectively prevents binding in that area and therefore detaches the tape 10 from the wall 44 as the stripping progresses upward towards the inner leading edge 46 of the stripping band 30. the adhesive layer 16 progresses substantially uniformly with the release of the adhesive layer 14, so that a portion 50 of the adhesive layer 16 remains still adhered to the hook 42 as the release progresses towards the inner edge 46 of the web of the adhesive. detachment 30 in which case the adhesive layer 14 is completely peeled off after the wall 44. Figure 5 shows the same tape 10 of Figure 2 in an application as in Figure 4 but with the adhesive tape 10 inverted between the hook 42 and the wall 44. Specifically, the adhesive layer 14 is adhered to the back surface of the hook 42 and the adhesive layer 16 is adhered to the p 44. The tongue 26 extends from below the hook 42 to facilitate removal by stretching, and the release strip 30 is positioned against the effective end of the rear surface of the hook 42 and at the end of the belt 10 away from the tab 26. More preferably, the release strip 30 rests against the rear surface of the belt. hook 42 away from the tongue 26 completely toward the edge of the back surface of the hook 42. Again, as will be seen in detail below, a progressive stretch release will cause the adhesive layers 14 and 16 to simultaneously peel off the end of the tongue 26 towards the peel band 30. In the case of Figure 5, when the peel-off of the adhesive layer 14 progresses towards the inner leading edge 46 of the peel band 30, the adhesive layer 14 will completely peel off the hook 42. At the point where the stretch detachment progresses towards the inner leading edge 46 of the release strip 30, a 48 of the adhesive layer 16 will still remain attached to the wall 44. Such detachment and removal by progressive stretching of an object such as a hook 42 and a wall 44, is illustrated in Figures 6, 7, and 8. Starting with the Figure 6, after a force F about 26 is applied, the support layer 12 that makes the tongue 26 stretch. Figure 6 shows the tape 10 with the tongue 26 stretched but just before any detachment of the adhesive layers 14 and 16. When the force F continues to be applied to the tongue 26, as shown in Figure 7, a progressive detachment occurs of the adhesive layers 14 and 16 of the surfaces of the hook 42 and the wall 44. Figure 7 shows such progressive detachment near the point of the average release of the adhesive layers 14 and 16. As can be seen, the support 12 is stretched, the adhesive layers 14 and 16 are stretched and pulled from their respective surfaces and peeled off. Figure 8 shows the point of progressive detachment where the detachment of the adhesive layer 14 reaches the inner leading edge 46 of the release strip 30. At this point, the release strip 30, together with the progressive adhesive stretch upwards towards the inner leading edge 46, completely detaches the surface of the hook 42 from the tape 10. At the same time, a portion 48 of the adhesive layer 16 remains still adhered to the wall 44. In the situation just described, where the stripping band 30 is positioned to rest against the supporting or posterior surface such as the hook 42, the release by stretching of the belt 10 allows the hook 42 to simply fall or be easily removed from its mounted position on the wall 44 while the belt 10 remains still adhered to the wall 44. In this way, an additional force that in other circumstances could tend to catapult the hook 42 is exerted s the hook 42 by the stretched tape 10 at the full detachment point of the hook 42 of the tape 10. After the hook 42 is released, after stretching it will simply neatly detach the remaining portion 48 from the adhesive layer 16 of the wall 44. Alternatively, the remaining portion 48 could simply be detached from the wall 44. To remove the hook 42 from the surface of the wall 44 with the tape 10 applied in the manner shown in Figure 4, one could be fastened on the hook 42 with one hand while the adhesive tape 10 is stretched to remove the hook from the surface of the wall. The stretching of the tape 10 eventually progresses to the point of the inner front boude 46 of the release strip 30 on where the total detachment of the adhesive layer 14 from the surface of the wall 44 will occur resulting in the removal of the hook 42. In this point, however, the area 50 of the adhesive layer 16 of the tape 10 corresponds to the release strip 30 of the adhesive layer 14 remains still adhered to the back of the hook 42. In this way, the risk of pre-detachment of the tape 10 is substantially eliminated, which is substantially problematic when the support layer or solid adhesive layer is elastic. Once the hook 42 is removed from the wall 44, the remaining adhesive tape 10 can be stretched and removed cleanly from the hook 42. Alternatively, the remaining portion 50 of Figure 10 can be detached from the hook 42, although it is preferred complete the removal by stretching, so that no residue is left on the surface of the hook 42 and the hook 42 can be used. In any application shown in Figures 4 or 5, it can be seen that the strip of release 30 provides the initial controlled release of one of the adhesive layers relative to the other caused by the simultaneous progressive detachment of both adhesive layers 14 and 16 from the end of the tab 26 upwards until the detachment reaches the inner leading edge 46 of the detachment band 30. The length of the detachment band 30 (the longitudinal dimension in the direction of the cross section of the Figures) determines this way how fast the first adhesive layer 14 is peeled off before the second adhesive layer 16 is peeled off. In addition, the area of the peel band 30 substantially defines the size of the corresponding adhesive portions 48 and 50 which remain adhered after complete peeling. of the first adhesive layer 14 during the stretch release. On the one hand, it is desirable to minimize the length of the release strip 30 to ensure a sufficient adhesive connection between the adhesive layer 14 of the tape 10 and the hook 42 or the wall 44; however, it is preferred that the length of the peel band 30 be sufficient such that the total peel of the adhesive surface occurs with the peel adhesive strip occurring prior to any potential subtle failure of the adhesive constituting the portion area. remaining 48 or 50. This of course depends on the properties of the support with respect to its Young's modulus and elongation characteristics and the specific pressure-sensitive adhesive constituting the adhesive layer 16. With a low modulus material, the support of the tape is stretched more easily and a shorter length and strip of release is required to provide sequential detachment. With a larger modulus material, the tape support is more difficult to stretch and a longer length than the release band may be required. An additional advantage of the belt constructions described above is their reuse capacity for the assembly of objects or hooks.

When a tape construction such as that shown in Figure 3 is used at 10 'having a non-adhesive portion 34 in place of a release layer, the adhesive layer 36 will be completely peeled off from the surface to which it is attached when the adhesive layer 36 is stretched toward its trailing edge 37 which defines the non-adhesive portion 34. In that case, a corresponding portion of the adhesive layer 16 will still adhere. A second embodiment of the sequential release ribbon 100 is illustrated in Figure 9. The ribbon 100 comprises a layer of polymeric foam 102 and a layer of polymeric film 104 adhered to another by means of a layer of pressure sensitive adhesive 106. Alternatively, the foam layer 102 and the film layer 104 could otherwise be laminated by heating or co-extrusion, or a similar process. The polymeric film layer 104 may be used to increase the load-bearing strength and resistance to rupture of the tape 100, particularly where the polymeric foam layer 102 lacks the properties under other circumstances required in a support to permit removal. by stretching. The inclusion of the film layer 104 therefore allows a greater latitude in the selection of the foam layer 102 to optimize, for example, the conformability and elastic properties. In a similar sense of the tape 10 described above, the entire tape sheet of the sequential release tape 100 is designed to be stretched for removal. The foam layer 102, the film layer 104, and the pressure sensitive adhesive layer 106 constitute the support for the tape 100. The foam layer 102 and the film layer 104 also have adhesive layers 108 and 110, respectively , of the same or different pressure sensitive adhesive compositions coated thereon to adhere the tape 100 to an object such as a hook 112 and the surface of a substrate such as a wall 114. Again, this tape construction is particularly suitable to stretch the entire strip to effect detachment of both the hook 112 and the wall 114, which allows easy reuse of the hook 112. Alternatives to the use of the polymeric film layer 104 to provide the same increase in the resistance to the support load and breaking strength could be conventional reinforcement cambrayes such as non-woven cambrayes, plastic meshes, or the like, which could also exhibit the s relevant elasticity characteristics necessary for the modality described above. At one end of the foam layer 102 and the film layer 104, a tongue 116 is formed to facilitate the stretch removal of the tape 100. The tape 116 is preferably simply made without providing adhesive layers 108 and 110 in a single layer. extreme region of the support. In other circumstances, a coating, film or the like could be applied over the adhesive layers 108 and 110, if they were spread over the entire support to form the tongue 116. Opposed to the end of the tape 100 where the tongue 116 is provided, also a stripping band 118 is provided that covers at least one effective end portion of the adhesive layer 108 or '110. The effective or functional end of the strip 100 opposite the formation of the tab 116 means the portion of the adhesive layer 108 6 110 which must be covered by the stripping band 113 to produce the sequential detachment. That is, one surface will come off completely before the other. The detachment by sequential stretching occurs with the tape 100 in substantially the same way as described above with respect to the tape 10. Specifically, when the tongue 116 is clamped and a force is applied to stretch the release tape 100, a progressive detachment occurs of the adhesive layers 108 and 110 substantially at the same time. Again, detachment occurs substantially simultaneously simultaneously by stretching the adhesive layers 108 and 110 as a result of the stretching of the release tape 100. When the release of the adhesive layer 108 reaches an inner edge 120 of the release strip 118, the adhesive layer 108 remains completely detached from the surface to which it was applied, such as the upper part of a hook 112 as shown in Figure 9. At this point, an adhesive portion 122 substantially corresponds to the dimensions of the stripping band 118 will still remain adhered to the surface to which the release tape 100 was applied, such as the wall 114 as shown in Figure 9. Once the adhesive layer 108 is completely detached from its surface, the hook 112 is removed from the wall 114. Subsequently, the remaining adhesive portion 122 can be removed by continuing the stretching or detachment of the tape 100. Stretch removal This is preferred since it will not leave adhesive residue on the remaining adhesion surface. As with the tape 10, described above, the side of the belt release strip can be applied to the surface of the wall in place and could be removed in the same manner as described above with the first release of the belt. the wall 114. A third embodiment of another construction for a sequential detachment belt 200 is illustrated in Figure 10. The release strip 200 comprises a layer of laminated film / foam 202 which itself is comprised of a layer of polymeric foam 204 and a layer of polymeric film 206. Preferably, the polymeric foam layer 204 and the Polymer film layer 206 is hot rolled one on top of the other, although other conventional lamination methods or conventional coextrusion methods can be used, including the use of any number of adhesives. A polymeric film layer 208 also adheres to the film / foam layer 202 by means of a layer of pressure sensitive adhesive composition 210. In this construction, the film / foam layer 202, the polymeric film layer 208 , and the layer of pressure sensitive adhesive 210 constitute the support of the tape. The foam layer 204 and the film layer 208 contain on their larger surfaces adhesive layers 212 and 214 of the same or different adhesive compositions for adhering the tape 200 to an object such as a hook 216 or other surface such as the wall 218. A tab 220 is provided comprising a portion of the film / foam layer 202, the film layer 208, and the pressure sensitive adhesive layer 210 without providing adhesive layers 212 and 214 on one end of the tape construction 200. One aspect of the tape construction 200 is that only the polymeric film layer 208 and the adhesive layers 210 and 214 need to comprise a stretchable tape material. To facilitate this, the film / foam layer 202 is cut at 222 to define the tab 220 to hold and stretch the tape. By virtue of the cut 222, the clamping of the tab 220 and the stretching of the release strip 200 only stretches the film layer 208 and the adhesive layers 210 and 214. In this way the release by stretch between the adhesive layer 210 and the adhesive layer 210 occurs. film layer 202 and the adhesive layer 214 and the surface of the wall 218. In other words, the adhesive layers 210 and 214 are detached from the surfaces of the film layer 206 and the wall 218. By this construction, only the layer of film 208 and adhesive layers 210 and 214 need to have the stretch characteristics necessary for stretch release. The film layer 206 and the foam layer 204 may be chosen based on other desired characteristics. Specifically, the foam can be optimized, for example, for the formability and elasticity properties. Similarly, the film layer 206 may be chosen based on load-bearing strength, breaking strength, surface finish and composition for release characteristics. Similar to the tape constructions 10 and 100, a release strip 224 is provided at the effective or functional end of the release strip 200 away from the tab 220. Again, the release strip 224 facilitates first removing one of the layers. Adhesive 212 or 214 before the other. An internal rim 226 of the stripping web 224 defines the point at which the total stripping of the adhesive layer occurs while a remaining portion 228 of adhesive remains adhered to the other surface. In the specifically illustrated embodiment, the release of the adhesive layer 210 from the film layer 206 occurs prior to the release of the adhesive layer 214 from the surface of the wall 218. Suitable materials for the foam layer 204 and the film layer 206 may be any materials that are generally suitable for tape carriers and may be chosen to optimize the features noted above. Preferably, the layer 204 comprises a polymeric foam material. Similarly, the film layer 206 preferably comprises a polymeric film. Other suitable materials may include layers of paper or paper products, non-woven fabrics, sheets and the like. Suitable materials for the release strip are any of those described above with reference to the tape 10 of the first embodiment, specifically including a non-adhesive portion provided in its place.

A fourth embodiment of another construction for a sequential stripping tape 300 is illustrated in Figure 11. The stripping tape 300 comprises a stretchable backing made of a foam / film / foam sheet that includes a layer of polymeric foam 302, foam layer polymer 304 and polymeric film layer 306. Film layer 306 may be laminated in a conventional manner to, co-extruded with, or adhered to foam layers 302 and 304, in a manner similar to or different from each other. The foam layers 302 and 304 contain on their surfaces larger adhesive layers 314 and 312 of the same or different adhesive compositions for adhering the tape 300 to an object such as a hook 316 and another surface such as the wall 318. A tab is provided. 320 comprising an extended portion of the foam / film / foam backing, preferably without providing adhesive layers 312 and 314 on one end of the tape construction 300. A release strip 324 is provided at the effective or functional end of the web. release strip 300 away from tab 320. Release strip 324 provides controlled initial release from one of adhesive layers 312 and 314 before the other. The internal front flange 326 of the release strip 324 defines the point at which the total release of the adhesive layer occurs (adhesive layer 312, as illustrated) while a remaining portion 328 of the adhesive remains (adhesive layer 314, as illustrated) attached to its surface (wall 318). The tape construction 300 allows the foam layers, which may be the same or different, to be optimized collectively or individually as regards the formability and elasticity to their respective surfaces for adhesion. As above, the film layer can be selected to improve elongation, load-bearing strength and resistance to breakage. A fifth embodiment of a sequential detachment tape 500 according to the present invention for joining structures such as a width 501 and a wall 502 to each other is illustrated in Figure 12. The release tape 500 has first and second opposite ends 503 and 504 separated in a first direction, first and second opposite external surfaces 505 and 506 extending between those ends 503 and 504, a manually clamped tab portion 507 adjacent its first end 503, and a joining portion 508 between its portion of tab 507 and its second end 504. Union portion 508 comprises two layers 510 and 511 of aggressive pressure sensitive adhesive of the same or different adhesive compositions and provide an adhesively aggressive portion (512 and 513 respectively) of each of the outer surfaces 505 and 506. The layers 510 and 511 of the adhesive adhere along the larger surfaces of a stretchable support that is a sheet of film / foam / sheet including a layer of polymeric film 515, a layer of polymeric foam 516 and a layer of polymeric film 517. The film layers 515 and 517 can be laminated in a conventional manner to, co-extruded with, or adhering to opposite sides of the foam layer 516. Each adhesive-aggressive surface portion 512 or 513 has a primary end (520 and 521 respectively) adjacent the first end 503 of the tape 500 and a secondary end (522 and 523 respectively) adjacent the second end 504 of the belt 500 and adapted to firmly adhere to a different structure between its primary and secondary ends 520, 522; 521, 523. The joining portion 505 is stretchable, so that when the joining portion 508 is between and adhered to the structures 501 and 502 as illustrated in Figure 12 it can be stretched progressively along its length by manual application of force to its tab portion 507 to produce the separation of the adhesively aggressive surface portions 512 and 513 of the structures progressively from their primary ends 520 and 521 to their secondary ends 522 and 523. The secondary ends 522 and 523 of the adhesively aggressive surface portions 512 and 513 are separated from each other in the first direction for producing the essentially complete separation of the adhesively aggressive surface portion 512 of the structure or hook 501 before the separation of the other portion of the adhesively aggressive surface 513 from the other structure or wall 502. This separation is caused because the ends adjacent to the second end of the tape 504 of the layers 510 and 511 of the aggressive adhesive on both major surfaces of the support layer defining the secondary ends 522 and 523 of the adhesively aggressive surface portions 512 and 513 extend to different places with respect to the second end 504 of the tape 500 to separate the secondary ends 522 and 523 of the adhesively aggressive portions 512 and 513 of the outer surfaces 505 and 506 with each other. The belt 500 thus provides the controlled initial release of the adhesive layer 510 before the adhesive layer 511. The secondary end 522 of the layer 510 of the adhesive 510 defines the point at which the total release of the adhesive layer 510 occurs while that a remaining portion 528 of the adhesive layer 511 remains adhered to the wall 502. The foam layer 516 can be optimized in terms of formability and elasticity to facilitate adhesion of the adhesive layers 510 and 511 to surfaces such as those of the hook 501 and the wall 502. The film layers 51 and 517 can be selected to improve the elongation, load bearing resistance and resistance to breakage. In view of the above modalities, it is evident that many modifications for other modalities are possible by combining several layers which together are optimized for a particular application. In general, foams are preferred to add elasticity and formability, while films improve resistance to load bearing and breakage. For components of layers of rotatable supports, the combined support must be sufficiently stretchable for detachment to occur but sufficient tensile strength to not break during peeling. For component layers that do not need to be stretched, as in Figure 10, there may be other options according to what is defined by the application and the compatibility of the layers. It was also contemplated that more layers (films, foams, etc.) can be provided in any number of ways depending on the application. As an alternative to each of the aforementioned embodiments expressly described and / or suggested, it was also contemplated that the non-adhesive portion of one of the adhesive layers of a two-sided tape construction (either without adhesive as in Figure 3) or that becomes non-adhesive by a strip of detachment or the like) may instead comprise a portion of low adhesion. Such construction provides differential detachment and release. Low adhesion means that there is a weaker or less aggressive adhesion between the adhesive of that portion and the surface to which it adheres compared to the adhesion of the adhesive layer attached to its substrate. In one case, the release strip or non-adhesive portion of the above embodiments could be replaced with a less aggressive adhesion material composition. Such a low adhesion material can be applied directly to the relevant support layer or the surface of the attached adhesive layer can be coated. Any adhesive composition exhibiting less adhesion than that of the attached adhesive layer is contemplated, including the other adhesive material compositions listed below. In addition, adhesive release or coating techniques can be used. A specific example of a low-aggressive adhesive that appears to be suitable for many applications is the adhesive used in the manufacture of post-itMR repositionable notes, which are available from the Minnesota Mining and Manufacturing Company of Saint Paul, Minnesota. Although the use of a low adhesion portion does not provide complete detachment from one adhesive surface before the other from a two-sided stretch tape construction, it can essentially accomplish that task. On one side, it will come off substantially and in any case it will be easier to remove the remaining adhesive portion corresponding to the other side of the two-sided stretch tape construction. At least to some degree, the effects of detachment and catapulting, discussed above, will diminish. Instead of using a less aggressive adhesive composition to define a low adhesion portion, the surface at which the relevant portion (for initial detachment) of the object or wall, etc., can be modified to reduce its affinity for the adhesive of a of the adhesion layers of a two-sided stretch tape. For example, the end section of the surfaces of a hook or object to be attached may be coated with a release material such as a release liner of silicone. Alternatively, a differential adhesive area may be produced on the hook or object by molding or profiling a textured area which significantly reduces the adhesive contact. The advantage of this is that the adhesive layers of two-sided stretch tape do not need to be modified by themselves. Another way to achieve sequential detachment can be the placement of the hook or object in relation to a double-sided adhesive tape, stretchable, without a portion of low differential adhesion, or a non-adhesive portion (turned or not). In this regard, reference is made to Figure 13. A tape 400 is illustrated, which is similar to the tape of Figure 1 but without providing a non-adhesive or low adhesion portion. The tape 400 comprises a stretchable support 402 and the adhesive layers 404 and 406 of the same or different pressure sensitive adhesive. The stretchable support 402 may comprise a foam, film or the like as set forth above, or any of the possibilities for sheets and alternative constructions suggested above. The tape 400 is shown with the adhesive layer 404 adhered to the surface of an object, hook 408, and adhesive layer 406 adhered to another substrate, such as the wall 410. A tab for stretching is shown as 412. To provide a release Sequentially, the surface of the hook 408 adheres to the adhesive layer 404 but terminates inwardly of a distal end 414 of the tape 400. In this manner, the surface of the hook 408 will come off completely while giving a portion 416 of the layer adhesive 406 adhered to the surface of the wall 410. Again, the stretch removal occurs by applying a force to the tongue 412 away from the object and the subsequent stretching of the support 404 and the adhesive layers 404 and 406 with substantial simultaneous progressive detachment. When the detachment of the adhesive layer 404 reaches the upper edge of the surface of the hook 408, the hook 408 comes off completely, while the portion 416 remains adhered. It was also contemplated that the application form illustrated in Figure 13 and described above may be carried out in combination with non-adhesive portions, release strips, or low adhesion portions as described above. Suitable materials for any of the stretchable layers described in any of the foregoing embodiments include any materials that are stretch-free without breaking less than 50% elongation and have sufficient tensile strength to not break before being peeled off. Again, such stretchable materials can be either elastically deformable or plastically deformable whenever sufficient stretch is possible to cause the adhesive to come off from both adhesive surfaces by stretch removal. Suitable plastic support materials are described in the US applications Serial Numbers 08 / 259,747 (Krec el et al.) And 08 / 308,937 (Bries et al.), Copendientes, which are commonly owned by the Beneficiary of the present application. Representative examples of suitable materials for either a polymeric foam or solid polymeric film layer in the tape carrier of this invention of the type that utilizes a plastic support include polyolefins, such as polyethylene, including high density polyethylene. , low density polyethylene, linear low density polyethylene, and ultra-linear low density polyethylene, polypropylene, and polybutylenes; vinyl copolymers, such as polyvinyl chlorides, both plasticized and unplasticized, and polyvinyl acetates; olefinic copolymers, such as ethylene / methacrylate copolymers, ethylene / vinyl acetate copolymers, acrylonitrile-butadiene-styrene copolymers, and ethylene / propylene copolymers; acrylic polymers and copolymers; polyurethanes; and combinations of the above. Mixtures or combinations of any plastic or plastic materials and elastomeric materials such as polypropylene / polyethylene, polyurethane / polyolefin, polyurethane / polycarbonate, polyurethane / polyester can also be used. The layers of polymeric foam for use in the plastic support of the tapes of the invention will generally have a density of about 2 to about 30 pounds per cubic foot (about 32 to about 481 kg / m 3), particularly in belt constructions where the foam will be stretched to effect detachment.

Polyolefin foams are preferred for the layers of plastic polymeric foam in the support of the tapes of the invention. The polymeric foam layers are more preferably polyolefin foams available under the trade designations VolextraMK and Volara ™ from Voltek, Division of Sekisui America Corporation, La rance, Massachusetts. Suitable alastomeric materials as supports for the tapes according to the present invention include styrene-butadiene copolymer, polychloroprene (neoprene), nitrile rubber, butyl rubber, polysulfide rubber, cis-1,4-polyisoprene, terpolymers of ethylene-propylene (EPDM rubber), silicone rubber, polyurethane rubber, polyisobutylene, natural rubber, acrylate rubber, thermoplastic rubbers such as the block copolymer of styrene and butadiene and the styrene-isoprene-styrene block copolymer and materials of rubber TPO. Solid polymeric film cuts are preferably selected from polyethylene and polypropylene films, with the most preferred materials being non-oriented linear low density polyethylene films and ultra low density films. A preferred polyethylene film is one that is available under the trade designation MaxileneMK 200 from Consolidated Thermoplastics Company, Schaumburg, Illinois.

The support may vary in total thickness as long as it possesses sufficient integrity to be processable and manageable and to provide the desired performance with respect to the stretching properties for the release of the support or tape from a surface. The specific total thickness selected for a support will depend on the physical properties of the polymer foam layer or the layers and any layer of solid polymer film forming the support. Where only the polymeric film or foam layer of a multilayer support is intended to be stretched to effect detachment, this layer must exhibit sufficient physical properties and be of sufficient thickness to achieve that objective. A layer of plastic polymeric film such as contained in the constructions of Figures 9, 10 and 11 will preferably be from about 0.4 to 10 mils in thickness, and more preferably will be from 0.4 to 6 mils in thickness. The adhesive of the adhesive layers, excluding the adhesives useful for the low adhesion portion of a differential release tape, may comprise pressure sensitive adhesives, with particular adhesion properties depending on the use of the tape, with the preferred adhesion properties generally fluctuating from about 4. N / dm to about 200 N / dm, preferably from about 25 N / dm to about 100 N / dm, at a peel angle of 180 °, measured according to PSTC-1 and PSTC-3 and ASTM D 903 -83 at a peeling speed of 12.7 cm / min. Adhesives that have higher release adhesion levels usually require supports that have higher tensile strength. Pressure sensitive adhesives suitable for applying to one side of the backing and / or the other in the tapes of the invention include adherent rubber adhesives, - such as natural rubber; olefins; silicones; synthetic rubber adhesives such as polyisoprene, polybutadiene, and block copolymers of styrene-isoprene-styrene, styrene-ethylene-butylene-styrene and styrene-butadiene-styrene, and other synthetic elastomers; and adherent or non-adherent acrylic adhesives such as isooctyl acrylate copolymers and acrylic acid, which can be polymerized by radiation, solution, suspension or emulsion techniques. Preferred are synthetic or acrylic rubber adhesives. The thickness of each adhesive layer can range from about 0.6 mils to about 40 mils (about 0.015 mm to about 1.0 mm), preferably from about 1 mil to about 16 mils (about 0.025 mm). approximately 0.41 mm). In this preferred range of thicknesses, the thicker layers tend to cause the tapes to be more easily removed from the thinner layers. This contrasts with conventional methods of removal, such as removal by detachment at 90 ° or greater detachment angles. In general, thicker layers of adhesive tend to cause the tapes to exhibit greater peel strength at a 180 ° peel angle than thinner layers. When the tapes of the present invention are detached by stretching at a low angle, ie, less than 35 °, the adhesive tends to be restricted by the support and the substrate of a single-sided adhesive tape and by the backing and two substrates for an adhesive tape coated on both sides, and is forced to undergo a significant elongation. Under these conditions, the adhesive layer (or each adhesive layer) contracts, which reduces its cross-sectional area. Since the cross-sectional area, ie a certain number of times the thickness, of a thinner layer of adhesive is already smaller than that of a thicker layer of adhesive, the stress, ie the strength per unit area, is greater in the thinner adhesive layer than in the thicker adhesive layer. This leads, in effect, to a stiffening of the adhesive. Because the more rigid layers offer more resistance to deformation, the force required for detachment is greater. The exposed adhesive layer or layers may be laminated to a conventional release liner prior to use. Adhesives for adhering a layer of polymeric foam to either another layer of polymeric foam or a layer of solid polymeric film include those pressure sensitive adhesive compositions described above. Preferably the adhesive layer for bonding one polymer layer of the backing to another should be approximately 1 to 10 mils, approximately 0.025 to 0.25 mm) thick. Other methods for adhering the polymeric layers of the support to another include conventional methods such as coextrusion or thermal welding. The tape of this invention can be produced by any conventional method for preparing pressure sensitive adhesive tapes. For example, the adhesive can be coated either directly on the support, or it can be formed as a separate layer and subsequently laminated to the support. The removal of the tape from the surface of the substrate can be carried out by simply stretching the tape in an upward direction at an angle of about 35 ° from the surface. Preferably, the tape can be removed from the surface of a substrate by stretching the tape at an angle no greater than about 10 °. Removal at the appropriate angle will result in it being. leave a non-substantial or appreciable residue of adhesive and prevent the surface of the substrate from being damaged. The detachment of a highly elongated adhesive tape of this invention at low angles is characterized by a propagation of the "acute" crack type. Like the fracture of vitreous materials, an acute fissure leads to a high concentration of stress in the front part of the fissure, where there is a low volume of adhesive material (in which the effort can dissipate). The high concentration of stress in the front part of the crack leads to what is called fragile sinking failure of the adhesive. Such failure typically occurs with low force (due to the low amount of energy dissipated in the adhesive material) and is cleanly interfacial. In contrast, for larger release angles, ie, angles generally greater than 35 °, the support does not tend to stretch and the adhesive tends to experience row and cohesive breaking. Like the fracture of vitreous materials, the propagation of a "blunt" crack is preceded by cracking. In this model, the observed filamentation of the adhesive at higher angles serves mainly as a mechanism of energy dissipation, analogous to the cracking fibrils found in vitreous materials, A higher energy dissipation, greater peel strength and greater strength required to detach the tape. A large volume of material is involved in the dissipation of energy, and, as stated above, the effort is less concentrated. Adhesive filaments break cohesively to leave adhesive residue on the surface or cause damage to the surface. The tape of this invention can be used in several areas, including the following categories; (1) mounting applications on surfaces such as fiberboard, poultice, concrete, glass, metal or plastic, such as wall assemblies, dispensers, wire fasteners, vehicle body side moldings, carrying handles, application of signs, for example, road signs, vehicle markings, transport marks, and reflective coating, etc .; (2) joint or assembly applications; (3) sound damping or damping applications, such as damping materials for placing objects or sound insulation sheet materials underneath; (4) closure applications, such as container closures, e.g., case closures, closures for food and beverage containers, and the like; diaper closures; surgical clothing closures; and the like; and (5) removable labels, such as price labels or identification labels on the containers. The particular construction of the tape, for example, the type of support, the type of adhesive compositions and the relative position of the support and the adhesive layers, often requires that they be different for each category of use. Preferred hook configurations for use in combination with a tape of this invention for assembly applications are described in US Patent Application Serial No. 08 / 216,135 which was filed on March 22, 1994 and is commonly assigned. This application corresponds to International Application No. PCT / US93 / 02643 which was filed on March 23, 1993. A particularly preferred hook configuration is that illustrated in Figure 7 and Figure 8 of that application. Preferred wire frame and bracket configurations are described in U.S. Patent Application Serial No. D-29 / 027,822; U.S. Patent Application Serial No. D-29/029, 272; and U.S. Patent Application Serial No. D-29/029, 273, which were filed on August 30, 1994 and are commonly assigned. Other preferred hook configurations are disclosed in U.S. Patent Application Serial No. D-29 / 039,674 filed June 1, 1995, co-pending, which is commonly assigned.

Test Methods for Testing the Ribbon of the Invention Painted Fiberboard Tables Test Panels The gypsum sheet U.S. 3/8"(9.5 mm) was first painted with Sherwin Williams ProMarMR 200 interior latex primer, then with a single top latex paint coating for Sherwin Williams ClassicM 99 flat wall interiors. The pressed fiber boards were aged under ambient conditions at approximately 22 ° C for a minimum of 48 hours before being used for the test.

Adhesive Residue The amount of adhesive residue remaining on the painted fiberboard boards was determined by visual inspection.

Surface Damage The occurrence of any damage to the surface of the painted fiberboard boards was determined by visual inspection. ' Adhesive Compositions Used to Prepare the Tapes of the Invention 15 Composition: Kraton ™ 1118 75 pts Finaprene ™ 1205 25 Piccolyte ™ A-135 101 Shellflex ™ 371 20 Kraton ™ 118 is a styrene-butadiene block copolymer available from Shell Chemical Co. The Piccolyte ™ A-135 is an alpha-pinene resin available from Hercules Chemical Co. Shellflex ™ 371 is a naphthenic oil available from Shell Chemical Co.

Example 2 of U.S. Patent No. 699,842 is as follows: KratonHR 1657 5.00 pts RegalrezMR 1078 5.00 RegalrezMR 1018 1.50 TritonMR X-100 0.16 TritonMR X-200 OdO Toluene 17.80 IrganoxMR 1076 0.12 CyanoxMR LTPD 0.12 Water 5.90 64.10 isooctyl acrylate / octylacrylamide / sodium styrene sulfonate terpolymer (87: 12: 1) KratonMR 1657 is a styrene-ethylene-butylene-styrene elastomer from Shell Chemical Company Regalrez ™ 1078 is an adhesive resin available from Hercules Incorporated. RegalrezM 1018 is an adhesive resin available from Hercules Incorporated. The TritonMI < X-100 is a nonionic surfactant available from Rohm and Haas Co. Triton ™ X-200 is a nonionic surfactant available from Rohm and Haas Co. The Irganox ™ 1076 is a phenolic antioxidant available from Ciba-Geigy. CyanoxMR LTPD is a phenolic antioxidant available from American Cyanamide Co.

C. Composition of Example 1 of US Patent No. 5,143,972, prepared by combining Part A and Part B as follows: Part A KratonMR 1657 11,150 pts Regalrez 1018 8,360 REZ-DMH 2084 13.940 Irganoxk 1076 0.112 Part A (contd) CyanoxMR LTPD 0.112 TinuvinMK 328 0.033 UvinolMR 400 0.033 Tolueno 41,260 Part B Reaction product of: Isopoyl acrylate 8,800 pts Acrylamide 0.250 Acrylic Acrylic 0.250 • 2-polystyrethylethyl methacrylate 1,350 Ethyl Acetate 7.650 Methyl Ketone 1,700 Toluene 5,000 The REZ-DMR is an adhesive resin available from Hercules Incorporated. Tinuvin ™ 328 is an ultraviolet inhibitor available from Ciba-Geigy Corp.

D. Composition: FinapreneM ™ R 1205 7.095 Finaprene ™ 411 13,176 Piccolyte ™ A-135 20,270 Shellflex ™ 371 2,027 Ethanox ™ 330 0.405 Toluene 57,027 The Finaprene ™ 1205 is a two-block styrene-butadiene graduated copolymer available from Fina Oil and Chemical Co. Finaprene ™ 411 is a styrene-butadiene-styrene radial block copolymer available from Fina Oil and Chemical Co. Ethanox ™ 330 is a phenolic antioxidant available from Ethyl Corp.

Composition: KratonM ™ R 1657 100.0 pts Wingtack ™ Extra 100.0 Irganox ™ 1076 1.5 Cyanox ™ LTPD 1.5 The Kraton ™ 1107 is a styrene-isoprene-styrene block copolymer available from Shell Chemical Co. The Wingtack ™ Extra is a hydrocarbon resin adhesive available from Goodyear Tire and Rubber Co.

Composition; 2-mil and 5-mil adhesive adhesive transfer tapes available under the trade designations Scotch ™ VHB F-9460PC and F-9469C, respectively, from the Minnesota Mining and Manufacturing Company of Saint Paul, Minnesota.

G. Composition: 2-mil and 5-mil adhesive adhesive transfer tapes available under the trade designations Scotch ™ VHB F-9752PC and F-9755C, respectively, from the Minnesota Mining and Manufacturing Company of Saint Paul, Minnesota.

EXAMPLES Example 1 A tape construction of the type described above with reference to Figure 2 was prepared as follows: A piece of 1 inch (2.54 cm) per 1 inch (2.54 cm) of double pressure coated pressure sensitive adhesive tape was prepared from of a 3M double-coated pressure-sensitive adhesive foam tape brand VHB ™ 4945, available from the Minnesota Mining and Manufacturinq Company of Saint Paul, Minnesota. The piece of double-coated adhesive foam tape 10 was adhered to the back of a plastic hook 42 (as in Figure 4) in such a way as to provide an extended foam tongue 26. The standard silicone release paper is provided on the tape 4945 was removed from the adhesive layer 14 and the piece of that release paper was cut to dimensions of 1/4 inch (.635 cm) by 1 inch (2.54 cm) and reapplied to a release strip 30 to the portion Top of the adhesive layer 14 opposite the tongue 26. Next, the adhesive layer 14 adhered to a test panel of painted pressed fiber boards, as described above. While the hook 42 was taken with one hand, the adhesive foam tape 10 was stretched to remove the hook 42 from the surface of the wall 44. The continuous stretching of the tape 10 progressed to the point where the complete release of the adhesive occurred. 14 of the surface of the wall resulting in the removal of the hook 42. However, the area of the foam tape 50 directly opposite the side to which the release paper was applied remained still adhered to the back of the plastic hook. Once the hook 42 was removed from the wall 44, the remaining adhered foam tape, area 1/4 inch by 1 inch (635 cm x 2.54 cm) was stretched and removed from the hook 42. The sequential detachment of the tape 10 when it was removed by drawing cleanly from the surface of the dry wall painted without omission of the strip at peeling.

Example 2 A belt was made according to Figure 9 using a 1/32 inch thick polyethylene vinyl acetate copolymer foam, Volara ™ 12E, available from Voltek Division of Sekisui America Corporation of Lawrence, Massachusetts as layer 102, a film linear, low density polyethylene, Maxilene ™ 200 2 mil available from Consolidated Thermosplatics, Inc. of Schaumburg, Illinois as layer 104. Adhesive layers 106, 108 and 110 were a 3M acrylic transfer adhesive brand VHB ™ 9473, 10 thousandths of an inch thick. The stripping band 118 comprised a 3/16 inch piece of standard silicone release paper. The stripping band 118 adhered to the adhesive layer 108 at the end of the tape 100 opposite the tab 116 formed of the foam layer 102, the film layer 104, and the adhesive layer 106. The stripping band 118 provided a non-adhesive area of the tape 100 to the hook surface 112. Stretching of this release tape resulted in the clean removal of the adhesive layers 108 and 110 without catapulting the hook 112 after removal.

Example 3 A tape construction identical to that of Example 2 was prepared, except that the adhesive layer 106 and the foam layer 102 were omitted to provide a construction of adhesive tape supported on the film. This tape supported on film was removed cleanly without catapulting the hook after the removal.

Example 4 A tape construction according to Figure 10 was prepared using 1/16 inch thick polyethylene vinyl acetate copolymer foam, Volara ™ brand 4E0, 204 thermally laminated to a two thousandth ethylene vinyl acetate copolymer film inch 206, which composition is available from Voltek Division of Sekisui America Corporation of Lawrance, Massachusetts as film / foam sheet 202. Film layer 208 comprised a 2.5 mil linear inch low density polyethylene film. of Consolidated Thermoplastics, Inc. of Schaumburg, Illinois. The stripping band 224 comprised a 1/1000-inch polyester film 3/16 in length by the width of the tape. Adhesive layers 210, 212, and 214 comprised a rubber resin pressure sensitive adhesive according to the adhesive composition detailed above. The polyester film release band was used to provide a non-adhesive area of adhesive layer 210 to the surface of the film 206 of the film / foam sheet 202 at the end of the tape 200 away from an extended tongue 220. The sheet film / foam 202 was cut at the beginning of the extended portion constituting the tab to form a thick tab 220, so that only the film layer 208 and the adhesive layers 210 and 214 are stretched during the stretching of the tape. Stretching resulted in complete detachment of the adhesive layer 210 from the film layer 206 with the subsequent total detachment of the adhesive layer 214 from the surface of the wall 218.

Example 5 A tape construction according to Figure 11 was prepared using a polyethylene vinyl acetate copolymer foam of 1/32 inch thickness, Volara ™ brand 6E0, thermally laminated to a film of ethylene vinyl acetate copolymer of two thousandths inch, composition which is available from Voltek Division of Sekisui America Corporation of Lawrance, Massachusetts to provide layers 304 and 306, respectively. The layer 302 comprised a 1/32 inch thick polyethylene vinyl acetate copolymer foam, Volara ™ 6EO mark, adhered to a layer 306 by means of a pressure sensitive adhesive which, together with the adhesive layer sensitive to pressure 312 and 314, comprised a pressure sensitive adhesive of rubber resin according to the adhesive compositions detailed above. The stripping band 324 comprised a 1 mil polyester film and the end of the tape 300 opposite a tab 320 formed by an extension of the layers 302 was provided., 304 and 306. The adhesive layer 312 with the release strip 324 was adhered to a hook 316, and the adhesive layer 314 adhered to a test panel of pressed fiber boards. The sequential detachment of the tape 300 resulted in a clean removal without catapulting the hook 316 after removal.

Example 6 A tape 500 of the type illustrated in FIG.

Figure 12. The foam used in layer 516 was Volara ™ brand 6EO, 1/32 inch thick ethylene vinyl acetate copolymer foam which was thermally laminated on both sides of layers 515 and 517 of a film of linear low density polyethylene XñX ^ 161.1 of 1.75 thousandths available from Consolidated Thermoplastics, Inc. of Schaumburg, Illinois. Adhesive layers 510 and 511 comprised a rubber resin pressure sensitive adhesive according to the adhesive compositions detailed above. The secondary end 523 of the adhesive layer 511 was separated from the adjacent end of the adhesive layer 510 by approximately 0.18 inches or 0.46 centimeters. The adhesive layer 510 was adhered to a hook 501, and the adhesive layer 511 adhered to a test panel of pressed fiber boards 502. Sequential detachment of the strip 500 by pulling on the tab portion 507 resulted in clean removal without catapulting hook 501 after removal.

Example 7 A tape construction was prepared using an elastic solid adhesive product available from Beiersdorf AG of Hamburg, Germany commercially available as Tesa brand Power Strips. A strip of detachment of 1/4 inch in length and the width of the tape was prepared from a portion of the release liner provided on the tape product and applied to one end of the tape product away from a tab provided on the tape. ribbon product. The modified tape product was applied to the hook and the surface of a wall once with the release strip against the surface of the hook and a different time with the release strip against the surface of the wall. In both cases, the sequential detachment resulted in no hooking or catapulting of the hook.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it refers. Having described the invention as above, property is claimed as contained in the following:

Claims

1. A tape, characterized in that it is adapted to join a first and second structures to each other, the tape has first and second opposite ends separated in a first direction, first and second primary end surfaces extending between such ends, a portion of manually attachable tab adjacent to the first end, and a joining portion between the manually attachable portion and the second end comprising a layer of aggressive, pressure sensitive adhesive, which provides an adhesively aggressive portion of each of the outer surfaces, each portion adhesively aggressive. has a primary end adjacent to the first end of the tape, a secondary end adjacent to the second end of the tape and is adapted to firmly adhere to a different 'of the structures between the primary and secondary ends, the joining portion is stretchable so that the union portion when it is between and adhered to the structures can be stretched progressively along its length by manual application of force to the manually clamped portion to cause separation of the adhesively aggressive surface portions of the structures progressively from the primary ends to the secondary ends, the secondary ends of the adhesively aggressive surface portions are separated from each other in the first direction to cause complete separation of one of the adhesively aggressive surface portions of one of the structures prior to separation of the other from the adhesively aggressive surface portions of the other. of the structures.

2. The tape in accordance with the claim 1, characterized in that it comprises a single layer of pressure-sensitive adhesive that provides each of the adhesively aggressive portions of the external surfaces and includes a masking layer of material having non-adhesive properties or adhesive properties that are significantly reduced from the layer of adhesive. pressure sensitive adhesive adjacent the second end of the tape and extending over a portion of the layer of pressure sensitive adhesive that defines one of the adhesively aggressive portions of the outer surfaces to separate the secondary ends of the adhesively aggressive portions of the external surfaces to each other.

3. The tape in accordance with the claim 2, characterized in that the material in the masking layer is selected from the group consisting essentially of removable coating material, repositionable pressure sensitive adhesive, polymeric film, paper, powder, ink, and low adhesion filler material.

4. The tape according to claim 1, characterized in that it includes a stretchable polymeric support layer having opposite major surfaces and a layer of aggressive pressure sensitive adhesive, along each of the opposite major surfaces defining one of the adhesively aggressive portions of the external surfaces.

5. The tape according to claim 4, characterized in that the stretchable polymeric support layer is of a material selected from the group consisting essentially of polymeric film, polymeric foam, polymeric film laminated to polymeric foam, and two polymeric films laminated to opposite sides. of a layer of polymeric foam.

6. The tape in accordance with the claim 4, characterized in that the ends adjacent to the second end of the layers of aggressive pressure sensitive adhesive on both major surfaces of the support layer extend to the same place with respect to the second end of the tape, and the tape includes a masking layer of material having non-adhesive properties or adhesive properties that are significantly less than those of the layer of pressure-sensitive adhesive adjacent to the second end of the tape and which extends over a portion of the layers of aggressive adhesive to separate the secondary ends of the adhesively aggressive portions of the outer surfaces together.

7. The tape according to claim 6, characterized in that the material in the masking layer is selected from the group consisting essentially of removable coating material, repositionable pressure sensitive adhesive, polymer film, paper, powder, ink, and filler material Low adhesion

8. The tape according to claim 4, characterized in that the ends adjacent to the second end of the aggressive adhesive layers on both major surfaces of the support layer define the secondary ends of the adhesively aggressive portions of the outer surfaces with respect to each other.

9. An assembly, characterized in that it comprises first and second tape bonding structures with each other, the tape has first and second opposite ends spaced apart in a first direction, first and second opposing primary outer surfaces extending between the ends, an adjacent manually attachable portion. at the first end, and a joining portion between the manually attachable portion and the second end comprising a layer of aggressive pressure-sensitive adhesive, which provides an adhesively aggressive portion of each of the external surfaces, each adhesive aggressively portion having a primary end adjacent to the first end of the tape, a secondary end adjacent to the second end of the tape and firmly adhered to a different one of the structures between the primary and secondary ends, the joining portion is stretched so that the portion of union between and adhered to the structures can stretch progressively to along its length by the manual application of force to the manually clamped portion to cause separation of the adhesively aggressive surface portions of the structures progressively from the primary ends to the secondary ends, the secondary ends of the adhesively aggressive surface portions they are separated from each other in a first direction to cause complete separation of one of the adhesively aggressive surface portions of one of the structures before separation of the other adhesively aggressive surface portions from the other of the structures.

10. The assembly according to claim 9, characterized in that the tape comprises a single layer of pressure-sensitive adhesive that provides each of the adhesively aggressive portions of the external surfaces and includes a masking layer of material that has no adhesive properties or properties adhesives that are significantly less than those of the pressure sensitive adhesive adjacent the second end of the tape and extending over a portion of the pressure sensitive adhesive layer that defines one of the adhesively aggressive portions of the outer surfaces to separate the secondary ends of the adhesively aggressive portions of the outer surfaces together.

11. The assembly according to claim 10, characterized in that the material in the masking layer is selected from the group consisting essentially of removable coating material, pressure sensitive adhesive, repositionable, polymer film, paper, powder, ink and filler Low adhesion

12. The assembly according to claim 9, characterized in that the tape includes a stretchable polymeric support layer having opposite major surfaces and a layer of aggressive, pressure sensitive adhesive, along each of the opposing major surfaces that define one of the adhesively aggressive portions of the external surfaces.

13. The tape according to claim 12, characterized in that the stretchable polymeric support layer is of a material selected from the group consisting essentially of polymeric film, polymeric foam, polymeric film laminated to polymeric foam ,. and two polymeric films laminated to opposite sides of a polymeric foam layer.

14. The assembly according to claim 12, characterized in that the ends adjacent to the second end of the layers of aggressive pressure-sensitive adhesive on both major surfaces of the support layer extend to the same place with respect to the second end of the support layer. the tape, and the tape includes a masking layer of material having non-adhesive properties or adhesive properties that are significantly less than those of the layer of pressure-sensitive adhesive adjacent the second end of the tape and extending over a portion of the tape. the aggressive adhesive layers to separate the secondary ends of the adhesively aggressive portions of the outer surfaces from each other.

15. The assembly according to claim 14, characterized in that the material in the masking layer is selected from the group consisting essentially of removable coating material, repositionable pressure sensitive adhesive, polymeric film, paper, powder, ink, and filler Low adhesion

16. The assembly according to claim 12, characterized in that the ends adjacent to the second adjacent end of the layers of aggressive adhesive on both major surfaces of the support layer define the secondary ends of the adhesively aggressive portions of the outer surfaces and extend to different places with respect to the second end of the belt to separate the secondary ends of the adhesively aggressive portions of the outer surfaces from each other.

17. The assembly according to claim 9, characterized in that the first structure is a hook and the second structure is a wall.

18. The assembly according to claim 17, characterized in that the adhesively aggressive surface portions are separated from each other in the first direction to cause complete separation of one of the adhesively aggressive surface portions of the hook before separation of the other of the Adherently aggressive wall portions of the wall.

19. One assembly, characterized in that it comprises a first and second tape joining structures together, the first structure having a rear surface including a rear surface portion adapted to be adhered to and extend towards one end, the tape having first and second opposite ends separated in a first direction, first and second opposing primary external surfaces extending between the ends, a manually clamped tab portion adjacent the first end, and a joining portion between the manually attachable portion and the second end comprising a aggressive, pressure-sensitive adhesive layer, which provides an adhesively aggressive portion to each of the external surfaces, each adhesively aggressive portion having a primary end adjacent to the first end of the tape, a second end adjacent to the second end of the tape and is firmly attached to a different structure s with the adhesively aggressive portion adhered to the first structure that is adhered to the back surface with the edge separated in the first direction from the primary end of the adhesively aggressive portion adhered to the second structure and with the adhesive aggressively portion adhered to the second. structure at the secondary end, the joint portion is stretched so that the joint portion between and adhered to such structures can be stretched progressively along its length by manually applying a force to the manually clamped tongue portion to cause the separation of the adhesively aggressive surface portions from the structures progressively from the primary ends to the secondary ends, with the separation between the edge and the secondary ends of the adhesively aggressive surface portion adhered to the second structure causing separation of the Adhesive surface portion of the first structure before the separation of the other from the adhesively aggressive surface portions of the second structure.

20. The assembly according to claim 19, characterized in that the ends of the rear surface are on the edge.

21. The assembly according to claim 19, characterized in that the back surface includes a peelable portion extending along the edge and includes means along the peelable portion to restrict adhesion of the adhesively aggressive portion to the peelable portion.

22. The assembly according to claim 21, characterized in that the means along the peelable portion for restricting adhesion of the adhesively aggressive portion to the peelable portion is selected from the group consisting essentially of • a coating of peelable material, and a rough surface texture. SUMMARY OF THE INVENTION Double-sided stretchable adhesive tapes are disclosed for use in conventional applications, including particularly mounting or joining an object to another surface. An improvement is within the ability to control the timing of detachment on both surfaces, so that one adhesive surface comes off before the other. The first detachment can be either on the side of the object or the side of the surface, depending on the desired effect. The present invention is applicable to all stretchable tape constructions including the use of plastic support materials and / or elastic support materials and allows such an object to be removed without substantial risk of re-adhesion of the adhesive tape or catapulting of the object. The above-mentioned advantages can be achieved with a two-sided adhesive tape having a stretchable, plastic or elastic backing layer, and having a low adhesion or a non-adhesive portion of an adhesive surface, so that a larger adhesive adhesion portion corresponding on the other side remains more aggressively adhered to a surface during the expansion by dilation while the portion of the adhesive surface is aggressively adhered or completely detached from its surface. A non-adhesive portion may be free of adhesive, or it may be a portion of an adhesive layer that has become non-adhesive. A lower adhesion portion may comprise a lower adhesion material, ie, a weak adhesive, or may become less adhesive by treatment or coating.