WO2006097282A1

WO2006097282A1 - Adhesive tape comprising a multi-layer structure

Info

Publication number: WO2006097282A1
Application number: PCT/EP2006/002339
Authority: WO
Inventors: Gaby Schilling; Anke Lewin; Wolfgang Klauck
Original assignee: Henkel Kommanditgesellschaft Auf Aktien
Priority date: 2005-03-15
Filing date: 2006-03-14
Publication date: 2006-09-21
Also published as: EP1858997A1

Abstract

The invention relates to an adhesive tape comprising a multi-layer structure, said tape being coated on both sides with a contact adhesive. The tape consists of a support, which once the two objects have been bonded can be split into two parts by the action of torsional or shear forces. The invention is characterised in that at least one point on the adhesive tape is a predetermined breaking point.

Description

Adhesive tape with a multilayer structure

The invention relates to an adhesive tape having a multilayer structure which is coated on both sides with a pressure-sensitive adhesive and serves for bonding two objects and its use.

Self-adhesive tapes coated on both sides with a pressure-sensitive adhesive are known from the prior art for the bonding of a wide variety of materials. A problem with the bonding of objects is to loosen the connection again without damaging the objects. To solve this problem, numerous systems propose to release compounds from double-sided pressure-sensitive adhesive tapes by pulling in the direction of the bonding level again. In these systems, the stretching of the adhesive tape causes the adhesive layer to contract and its cross-sectional area to be reduced, causing the adhesive layer or adhesive tape to come off the substrate surface. A disadvantage with corresponding adhesive tapes is that for releasing the bond, a portion of the adhesive tape can not be used for bonding two objects, but must protrude from the adhesive joint, so that it can be used as a handle for pulling out the adhesive tape.

Since such a handle is not desired in all cases, for example, DE 19720 145 describes a double-sided adhesive tape with an intermediate carrier and on both sides applied to the intermediate carrier PSAs, wherein the intermediate carrier splits upon application of torsional forces, leverage forces and / or peel forces and then the adhesive tape residues Drawing in the direction of the bond plane are residue-free and non-destructive removable.

In DE 196 41 118 C1 is a removable self-adhesive hook or the like fastening device with a base plate and a strip of a described on both sides adhesive film, which is such that the bonding achieved with it by pulling it is releasable again.

A problem with the systems known from the prior art is that it is very easy for air entrapment between the substrate to be bonded and the adhesive tape during bonding. Such air bubbles can not be completely eliminated even by high contact pressures and cause reduced bond strengths, since often only bond areas of less than 50% of the pressure-sensitively adhesive area are achieved. Since the adhesive tapes, especially if they have a high adhesive strength, already have a high initial adhesion, such air pockets are often unavoidable even with accurate operation, since the adhesive tape immediately adheres to it when in contact with a surface to be bonded.

Object of the present invention is therefore to provide a double-sided adhesive tape, which has on the one hand a high load capacity and carrying capacity, can be glued to the surfaces to be bonded easily and to the exclusion of air bubbles and on the other hand allows a simple separation of two glued together objects ,

The invention is based on the finding that air pockets in the bonding of an adhesive tape while maintaining a high load capacity and carrying capacity can be prevented by the adhesive tape is provided at least one point with a predetermined breaking point.

The present invention is an adhesive tape having a multilayer structure which is coated on both sides with a pressure-sensitive adhesive and comprises a carrier which is splittable after bonding two objects by the action of rotational and / or shear forces in two parts, which is characterized in that the adhesive tape has a predetermined breaking point at at least one point. An adhesive tape is understood to mean an adhesive tape or adhesive pad or strip with which two objects can be adhesively bonded in a simple manner.

A carrier is to be understood as meaning an intermediate layer or an intermediate carrier on which further layers or directly the coating with a pressure-sensitive adhesive can be applied.

A pressure-sensitive adhesive or pressure-sensitive adhesive is to be understood as meaning a pressure-sensitive adhesive. Preferably, the adhesion of the (adhesive) adhesive applied on both sides of the adhesive tape to the outer sides of the adhesive tape is greater than the adhesion of the adhesive to the surfaces of the objects to be bonded.

The adhesive tape according to the invention thus has a multilayer structure. In the middle is the carrier, which is coated on its two flat outer sides. Either the two sides of the support are coated directly with a pressure-sensitive adhesive or one or more layers are arranged on one or both sides of the support, wherein in each case the two outer sides or surfaces of the adhesive tape are coated with a pressure-sensitive adhesive. The resulting adhesive tape is therefore coated on both sides with a bondable material, so that a so-called two-sided or double-sided adhesive tape is formed with adhesive layers arranged on both sides.

A predetermined breaking point is understood to be any damage to the adhesive tape which can lead to tearing or breakage of the adhesive tape. Such breakage or tearing may occur partially or sever the entire adhesive tape so that the entire thickness of the adhesive tape is severed. The dimensions of an adhesive tape are characterized by its longitudinal extent (longitudinal axis), its width (transverse axis) and its thickness (axis perpendicular to the adhesive surfaces of the adhesive tape). By the predetermined breaking points, a tearing of the adhesive tape is effected when pulled with a sufficiently large force in the direction of the longitudinal or transverse axis or in the direction of an axis lying in the plane spanned by the transverse and the longitudinal axis plane. It tears preferably the Whole thickness of the adhesive tape through, wherein the crack may be straight or curved, jagged, geometrically irregular or otherwise designed and preferably passes through the predetermined breaking point. The breaking or tearing of the adhesive tape by exerting a force with the aid of the predetermined breaking points thus results in the adhesive tape being split into two or more parts whose thicknesses are substantially equal to the thickness of the original, undamaged adhesive tape. The resulting fragments, however, have a different shape than the original adhesive tape when viewed from above the (adhesive) surfaces and may in particular have a different length and width dimension. The predetermined breaking points thus lead to the adhesive tape according to the invention essentially not being able to be stretched but tearing under tensile load. The elongation at break is preferably less than 15%, in particular less than 10%. Furthermore, the predetermined breaking points damage the adhesive tape such that a passage of air through the thickness of the adhesive tape is made possible. The predetermined breaking points can be generated for example by a perforation, by a punching, by a cut, by an embossing or by laser methods or other methods.

With the adhesive tapes according to the invention, two objects can be bonded together. It is particularly advantageous that the material of the adhesive tape is pre-damaged at these locations by the predetermined breaking points provided according to the invention such that air that is trapped when the adhesive tape is stuck onto an object between the object to be bonded and the adhesive tape can escape. When sticking adhesive tapes to objects, air bubbles between the object to be bonded and the adhesive tape in particular often occur when the pressure-sensitive adhesive used has a high bond strength. In the case of large-area adhesions, in particular in the case of adhesive tapes which form a long band, it is virtually impossible to prevent such air pockets in conventional adhesive tapes. Such air inclusions reduce the carrying capacity of the adhesive tape, since the total adhesive surface is reduced by the air pockets. In addition, such air pockets lead to visually disturbing bubbles or warping of the adhesive tape. By inventively provided predetermined breaking points, such air pockets on simple way avoided without reducing the adhesive force of the tape or its carrying capacity to any appreciable extent.

This provides an adhesive tape that allows two objects to be glued together in a simple manner, without the need for particularly accurate work to prevent air pockets. At the same time, the adhesive tapes according to the invention have a high load-bearing capacity and nevertheless permit a simple release of the two objects bonded to one another, since the support can be split laterally into two parts by the action of rotational or shearing forces. As a result, a gripper, which is required in many prior art systems, is not required.

Two objects glued together or a bonded object on a substrate can be solved very easily by the action of rotational or shear forces. By this "twisting" a splitting of the carrier is effected in two parts, so that then on the surfaces of the two bonded objects or on the surface of the article and the surface of the substrate or substrate of the originally adhered to the respective surface pressure sensitive adhesive These remnants of the carrier material may then be removed by skinning or peeling, Preferably, the remainders of the adhesive tape are thereby peeled off by applying a force at an angle greater than or equal to 90 ° to the bond plane, otherwise cracking will occur of the adhesive tape comes to the predetermined breaking point (s).

A further advantage of the adhesive tape according to the invention is that it also makes it possible to accomplish adhesions on uneven or irregular substrates without any problems. The inventive adhesive tape provided in the predetermined breaking points, the tape can better adapt to such uneven surfaces and possibly by partial rupture of the tape almost a full-surface bonding by adjusting the bonding surface under contact pressure to ensure the uneven surface structure. For the quality of the bond itself, such a partial tearing of the adhesive tape is only of secondary importance. It is also of particular advantage that objects with a tendency to dimensional changes (eg rubber materials, such as, for example, rubber hooks, floor coverings, wall hangings, decorative elements) can be glued together without problems. Such dimensional changes occur in particular in the bonding of objects which are subjected to changing temperature and humidity conditions and can thereby build up high expansion or shrinkage forces. In particular, in the temporary bonding, such as exhibition, in addition to the adhesive bond but also a residue-free redetachability of the adhesive tape is required, so that the property profile of the adhesive tapes of the invention is very advantageous here. With the adhesive tapes according to the invention, it is also possible to bond objects on interrupted surfaces, which have a certain mobility to one another. This is for example the case in the bonding of objects in joints or so-called expansion joints, for example on a surface which is interrupted by an expansion joint. So-called expansion joints occur, for example, in new buildings or in the bathroom with applied on wooden substrates tiles. When bonding in the joint, the adhesive tape is applied directly to the joint sealant, which is characterized in particular by the fact that it is dimensionally variable. The particular advantage of the adhesive tapes according to the invention is that there is no stretching of the adhesive tape and thus a weakening of the adhesive bond in the case of a dimensional change, but this dimensional change can be compensated for by breakage or tearing of the adhesive tape at the predetermined breaking point. In the known from the prior art adhesive tape systems in which the solution of the adhesive tape or the solution of the remnants of the adhesive tape is carried out by drawing in the direction of the bonding level, such dimensional changes lead to a weakening of the adhesion, so that ultimately there is a risk that comes to an adhesive break.

A further advantage of the adhesive tape according to the invention is that it is possible to use the predetermined breaking point already during bonding by partial tearing of the adhesive tape in the case of bonding in hard-to-reach corners or in the environment of more complicated geometric edge shapes full-surface bonding is achieved. Furthermore, the adhesive tapes according to the invention can also be used to bond objects to substrates in which a one-sided tensile load in one direction must be avoided (eg freshly bonded substrates), since the predetermined breaking points ensure that such a tensile load can not be erroneously caused by incorrect use of the adhesive tapes , In this case, there is previously a tearing of the adhesive tape or the remainder of the adhesive tape.

The adhesive tapes according to the invention are particularly suitable for assembly and connection applications.

For example, the adhesive tapes according to the invention are suitable for fastening hooks, emblems, posters, pictures, calendars, postcards, moldings, decals, foils, information signs, name badges or other signs, labels, decorations, wall hangings, floor coverings, resilient floor coverings, PVC coverings, Linoleum, upholstery, damping or insulating or sealing elements, markings, doorstops, various dispensers, carrying handles, graphic films, printing plates, applications, strips, etc., or in general for joining materials to be detackified at a later date. They are suitable for both short-term and long-term bonding.

As surfaces on which said articles can be mounted or glued, for example, come into question glass, Kuriststoff, rubber, concrete, cement, screed, gypsum (gypsum plasterboard, plasterboard), wall coverings, metal, wood, cork, laminate, linoleum, ceramic materials (stone, marble, tiles).

Further fields of use for the adhesive tapes according to the invention are joining or assembly applications or closure applications such as e.g. Container closures.

The adhesive tapes of the invention also allow, in particular, applications in which an unauthorized access is to be displayed, since the "detackification of the objects bonded together" is accompanied by the splitting of the carrier and thus the does not restore original condition. This is, for example, in the application of seals or special markings on valuable items or perishable goods and closures, for example, for medicines or security envelopes of interest. Another field of application is the bonding of objects that are needed in an emergency, such as devices for the separation of safety belts or safety hammers for driving windows in an emergency. The bonding with the adhesive tapes according to the invention on the one hand allows quick access to the items needed in an emergency, since they can be solved by a rotational movement quickly from the ground on which they are glued. On the other hand, the bonded residues of the carrier material initially remain on the substrate, so that it can be seen that at this point a new object must be hung up for the emergency equipment.

According to a preferred embodiment of the adhesive tape according to the invention, the (at least one) predetermined breaking point is brought about by a pretreatment of the adhesive tape. According to a further preferred embodiment of the adhesive tape according to the invention, the adhesive tape has a plurality of predetermined breaking points.

Several predetermined breaking points have the advantage that the advantages according to the invention, in particular the prevention of air inclusions, can be realized even better or to a greater extent. In this way, an easy handling of the adhesive tape is ensured since air that accumulates between the objects to be bonded and the adhesive tape can escape through a plurality of predetermined breaking points in the adhesive tape. Furthermore, the adhesive tape tears when exposed to sufficiently large tensile forces in the direction of the bond plane, preferably along the predetermined breaking points.

According to a further preferred embodiment of the adhesive tape according to the invention, the (at least one) predetermined breaking point (s) are / are produced by perforation, in particular by punching, punching or cutting (e). This means that the predetermined breaking points are achieved or carried out by perforation of the adhesive tape or of the individual layers of the adhesive tape. The perforation can be in the form of a Perforated, punched or made in the form of a cut or executed. According to this embodiment, the adhesive tape has thus been perforated, in particular perforated, punched or cut, at at least one point.

According to a preferred embodiment of the adhesive tape according to the invention, the predetermined breaking points are produced by perforations passing through all the layers, in particular by perforations, punching or cuts passing through all the layers. This means that the predetermined breaking point (s) of the adhesive tape are embodied in the form of perforations, in particular perforations, punches or cuts, passing through all the layers, and consequently the adhesive tape is continuous, i. Having perforations, in particular perforations, punches or cuts passing through all layers.

The perforations can be effected by a pretreatment of the multilayer adhesive tape or by coordinated pretreatments of the individual layers of the adhesive tape, which are then joined together in such a way that a perforation penetrating through all layers of the adhesive tape is formed. The resulting adhesive tape has therefore been perforated or perforated at least at one point. The perforation can be carried out by means of the usual methods known to the person skilled in the art, for example by perforating, punching, punching, cutting or cutting. For example, perforation may be produced by piercing with a needle or a spiked roller or the like. By means of this perforation, a continuous hole is produced in the adhesive tape, so that the adhesive tape according to the invention has a continuous hole or perforation after perforation. A perforation is understood to mean an opening which passes through all the layers of the adhesive tape and in particular allows the passage of air through this opening. The term "perforate" or "perforation" or "perforation" therefore does not refer to the manner in which this opening is made, and the perforation may accordingly also be effected by cutting tools, for example by blade cutting or perforation knives or by other mechanical methods, such as Drilling or punching, for example by means of rotary punching done. It is also possible to use thermal methods, for example laser perforation.

The perforation passing through all layers of the adhesive tape extends through the thickness of the adhesive tape, i. it extends from one side of the adhesive tape coated with a pressure-sensitive adhesive to the other side of the adhesive tape likewise coated with a pressure-sensitive adhesive. The perforation is therefore preferably made vertically to the adhesive surface of the adhesive tape and penetrates the entire thickness of the adhesive tape. It is also possible to make the perforations in defined other angles to the adhesive surface of the adhesive tape, so that they also penetrate the entire thickness of the adhesive tape.

The perforations can be arranged over the entire surface of the adhesive tape (evenly distributed) or regularly or irregularly detect only delimited areas of the adhesive tape. In this case, the perforation pattern can repeat and form, for example, alternating or uniform rows or other geometric arrangements.

The perforations or perforation holes may, for example, be round, oval, slit-shaped, diamond-shaped or otherwise polygonal. This describes the cross-sectional shape in view of the perforations, ie in a plan view of the adhesive surfaces of the adhesive tape. The individual perforations do not have to be identical to each other. A hole or perforation or perforation should be at least so large that an exchange of air through this opening is possible. An upper limit to the size of a hole or perforation does not exist in principle. However, it is preferred if the perforations have a diameter of max. 4 to 5 mm and the diameter (or gap widths) in particular about 0.5, 1 or 2 mm. In this case, an excellent air exchange is ensured and at the same time given the best possible water vapor permeability, which allows bonding to substrates that still have a residual moisture. The adhesive tape preferably has a width of 1 to 4 cm, in particular 1.5 to 2.5 or 3 cm. Particularly preferred is a width of 2 cm. The length of the adhesive tape may be, for example, 1 m, 3 m, 5 m or 10 m.

According to a preferred embodiment of the adhesive tape according to the invention, the adhesive tape is in the form of an adhesive pad or adhesive strip which may be round, square, rectangular or otherwise polygonal. Preference is given to round or rectangular adhesive pads. Round adhesive pads preferably have a diameter of 1 to 4 cm, in particular 2 to 2.5 or 3 cm. Particularly preferred are rectangular adhesive pads. The following descriptions therefore refer to rectangular adhesive pads. Rectangular adhesive pads preferably have a width of 1 to 4 cm.

According to a preferred embodiment of the adhesive tape according to the invention, the adhesive tape is in the form of an adhesive pad or adhesive strip and has a width of 1 to 4 cm, in particular 1, 5 to 2.5 or 3 cm. Particularly preferred is a width of 2 cm. The length of the adhesive pad is preferably 3 to 10 cm, in particular 4 to 5 or 6 cm. Particularly preferred is a length of 4 cm. Usual forms of the adhesive pad are square or rectangular, wherein the corners of the adhesive pad can be rounded. According to a particularly preferred embodiment, it is a rectangular adhesive pad with a width of 2 cm and a length of 4 cm.

According to a particularly preferred embodiment of the adhesive tape according to the invention, at least 2 perforations in the transverse direction of the adhesive tape are arranged on a straight line, i. the straight line runs essentially parallel to the edge of the adhesive tape, which defines the width of the adhesive tape. Particularly preferably, three perforations in the transverse direction of the adhesive tape are arranged on a straight line. However, four, five or more perforations in the transverse direction of the adhesive tape may also be arranged on a straight line.

According to a further preferred embodiment of the adhesive tape according to the invention are at least two, in particular three to ten perforations, in the longitudinal direction of the Adhesive tape arranged on a straight line, ie, the straight line is substantially parallel to the edge of the adhesive tape, which defines its length. Particularly preferred are 4 to 6, in particular five perforations, arranged in the longitudinal direction of the adhesive tape on a straight line.

According to a particularly preferred embodiment of the adhesive tape according to the invention, the perforations are spaced 3 to 10 mm, in particular 4 to 6 or 8 mm from each other. Distances of approximately 5 mm from each other are particularly preferred.

It is further particularly preferred if the perforations from the edge of the adhesive tape have a distance of at least about 0.3 or 0.6 cm, in particular of at least about 0.5 cm. Typical perforation or punching patterns in the form of perforations passing through the adhesive tape or adhesive pad are, for example, 3 by 2 (6 holes), 4 by 3 (12 holes), 5 by 3 (15 holes), 6 by 3 (18 holes), 6 4 times (24 holes), 7 times 3 (21 holes), 7 times 4 (28 holes) (each longitudinal / transverse direction). Particularly preferred are hole patterns of 4 times 3 and 5 times 3 holes.

According to a further particularly preferred embodiment of the adhesive tape according to the invention, the perforations or predetermined breaking points are designed in the form of continuous cuts or punches. Preferably, such cuts or punches have a width (diameter) of 0.5 to 1 mm (distance between the two outer edges of the cuts). Thus, instead of individual substantially round perforations or punches, lines can also be cut or punched in the adhesive tape. These lines or cuts can be either parallel in the longitudinal or transverse direction of the adhesive tape or diagonally executed or overlap and form, for example, crosses whose individual lines are parallel or diagonal to the outer sides of the adhesive tape. But such cuts or lines can also be executed bent and optionally additionally overlap. They can also be interrupted. It is also possible to punch or perforate the perforations in the form of circular or rectangular patterns in the adhesive tape. The resulting holes or perforations can vary depending on the type of perforation Have diameter on the two sides of the adhesive tape, ie, a hole may have from one to the other side of the adhesive towards an increasing or decreasing diameter. Of particular advantage and therefore important in this case only that the perforation is designed so that the diameter of the hole or the width of the cut allows the passage of air, so that when bonding between the objects to be bonded and the tape trapped air can escape through this opening. It has been found that the perforations even allow a passage of trapped air in the bonding, even if the pressure sensitive adhesive after a long storage time has partially or completely flowed into the perforations or holes formed by the perforation. Obviously, the air trapped during bonding is pressed through the perforation holes when the adhesive tape is pressed on and displaces the pressure-sensitive adhesive at least to such an extent that passage of the air is made possible.

According to a further particularly preferred embodiment of the adhesive tape according to the invention, the continuous cuts are arranged such that the axes passing through two cuts intersect in the middle of the adhesive tape in a plane parallel to the adhesive surfaces of the adhesive tape. This means that two straight lines, which are arranged parallel to the adhesive surface of the adhesive tape and pass through the two cuts, intersect at a point which is approximately in the middle of the adhesive tape. The cuts thus form an "X" which has been cut, punched or embossed into the tape It is also possible to provide the tape with several such X-shaped cuts or punches.

According to a further particularly preferred embodiment of the adhesive tape according to the invention, four cuts are arranged such that the axes passing through them and lying in a plane parallel to the bonding surface of the adhesive tape meet at a center point. This means that the straight lines, which are arranged parallel to the adhesive surface of the adhesive tape and pass through the cuts or form an imaginary extension of the cuts, at one point cut, which is located approximately in the middle of the tape. This achieves a perforation or punching in the form of a "non-solid X." It is also possible to provide several of these perforations in the form of a "non-solid X" per adhesive tape.

The perforation patterns described above have the advantage that, without substantially influencing the carrying capacity of the adhesive tape or the release mechanism, they allow a particularly good and efficient escape of air trapped between the object to be bonded and the adhesive tape. This makes it particularly easy to remove air bubbles that are normally trapped between the tape and the substrate when bonded. For this purpose, the adhesive tape is simply pressed firmly on the respective adhesive substrate. The trapped air bubbles escape completely through the perforation to the outside, so that the adhesion or wetting of the adhesive surfaces is improved to the substrate, so that a higher application security is achieved. In addition, these perforation patterns allow, in particular, adhesion of the adhesive tape according to the invention to dimensionally difficult substrates or dimensionally variable objects, since, when the bonded objects or surfaces are stretched, the adhesive tape may break or tear at the intended predetermined breaking points, so that the dimensional changes are compensated can be without affecting the bond itself. In addition, any residual moisture may escape from the substrate through the perforations.

The adhesive tape according to the invention comprises a carrier which can be cleaved into two parts after the adhesion of two objects by the action of rotational and / or shear forces. This means that the support is split into two parts substantially parallel to the bond plane when it acts on rotational and / or shear forces. This allows a simple way and without the use of special tools, namely by rotating or moving the bonded on a substrate object or two glued together objects, the solution of a corresponding bond. When the shear force exceeds the shear strength of the substrate, it becomes substantially split parallel to the bond plane, so that the two objects glued together can be separated from each other. Thus, a cohesive Br ¹ UCh (of the carrier material) is produced, which is caused by the torsional, shear or torsional forces exerted during the rotational, shear or torsional motion. Preferably, the support material splits through its entire surface, so that the thickness of the support material is divided into two halves, wherein the length and width extent of both the support material and the entire adhesive tape is substantially not affected or changed or destroyed. The adhesive tape is thus split by this split into two parts which have the same length and width extent as the original adhesive tape, but have a reduced thickness, the average of which is half the thickness of the undestroyed adhesive tape. According to a preferred embodiment of the adhesive tape according to the invention, the two parts, in which the carrier splits on application of rotational or shear forces, adhere to the two bonded objects. After bonding two objects, the carrier can thus be split into two parts by the action of rotational or shear forces (cohesive), which adhere to the two bonded objects. The two remainders of the adhesive tape or carrier remain when glued to substrates on which there is sufficient adhesion, usually stick to the surfaces of the two bonded objects and can then be gently removed from these. Only on low-energy surfaces, which are known to be poor or almost impossible to stick together, such as polyethylene, polypropylene or Teflon, it may happen that the residues do not stick or poorly adhere to these surfaces.

The two parts of the adhesive tape or the carrier adhering to gaps of the carrier by the action of turning and / or shearing forces on the two bonded objects are peeled off or peeled off in as large an angle as possible, in particular of at least 90 ° or greater removable from the glued objects. In this way, it is not only possible to separate the two bonded objects by the action of rotational or shear forces from each other, but it is also possible, the two parts of the adhesive tape, which adhere to the previously bonded surfaces, without damaging the surfaces of to remove this. These Parts of the adhesive tape or carrier are just as little as the tape itself by stretching pulling (from the ground on which they are glued) (ab) solvable. A release of the adhesive tape by pulling substantially in the bonding plane, which can lead to considerable damage to the surface because of the forces acting in this case in the direction of the bond plane and is therefore undesirable, is determined by the (n) predetermined breaking point ( n) or perforation (s) prevented because it comes with such a force to rupture or breakage of the adhesive tape. The particular advantage of this embodiment of the invention is that the adhesives used need not be tuned to the mechanism of stretched release, as known in the art, ie, by pulling at an angle approximately parallel to the bond plane, thereby providing a broader spectrum 'Different pressure sensitive adhesives for the adhesive tape according to the invention is accessible. As a result, it is also possible to produce systems with a higher load-bearing capacity, since it is possible in particular to use pressure-sensitive adhesives having high pressure-sensitive tackiness, which can then be removed by the gentler peeling or peeling mechanism.

According to a further particularly preferred embodiment of the adhesive tape according to the invention, a layer A is arranged on at least one side between the carrier and the pressure-sensitive adhesive, which is firmly connected to the carrier and the pressure-sensitive adhesive.

It is particularly preferred if the layer A has a higher tensile strength than the carrier. In particular, the layer A is not tearable by hand and also has a higher torsional strength than the carrier. Preferably, under application conditions (by hand), the layer A can be stretched by a maximum of 15%, in particular by a maximum of 10% and most preferably by less than 5%. The tensile strength of the support is in the range of 0.5 to 1.5 N / mm ² , in particular 0.85 to 1.3 N / mm ² , while the tensile strength of the layer A is in the range of 150 to 350 N / mm ² , especially in the range of 220 to 270 N / mm ² .

The advantage of this embodiment is that the entire adhesive tape is given a certain strength. The layer A thus acts as a stabilizing film, the one Elongation and thus prevents a change in thickness of the adhesive tape during assembly. Furthermore, the layer A serves as a stabilizing foil for the distribution of force during the pressing process. A further advantage of the use of such a stabilization layer is that a largely self-supporting adhesive tape is formed, which exhibits better dimensional stability and does not "hang down" when attempting to mount it, thus simplifying the precise sticking of the adhesive tape in that it allows a greater latitude in the selection of the support material and thus, for example, the conformability and the elasticity properties can be optimized.Also, the presence of such a stabilizing foil facilitates the splitting of the support in the "twisting-off mechanism" since the forces are uniform distributed over the entire surface, so that it reliably leads to a clean split image.

According to a further preferred embodiment of the adhesive tape of the invention, the layer A, which is arranged on at least one side between the carrier and the pressure-sensitive adhesive and is firmly connected to the carrier and the pressure-sensitive adhesive under application condition is substantially non-stretchable. Under application condition substantially non-stretchable means in the context of the present invention that for detaching the adhesive tape residue of an object manually applied force is so low that the layer A thereby stretched by less than 5% relative to its initial length. This is achieved, for example, by a bidirectionally stretched polyethylene terephthalate (PET) film of 50 μm thickness and 2 cm width, which extends at a tensile force of 5 kg by less than 5% in length.

The particular advantage of this embodiment is that is brought by the barely existing extensibility of the adhesive tape or adhesive strip the user to a peeling detachment movement. This mechanism is achieved by the invention. Perforation of the tape hardly affected. In contrast to a pulling release motion, as induced by the user through elastic or easily stretchable adhesive pads or strips, damage to the surface is added a peeling removal of the adhesive tape residues unlikely. Furthermore, the risk of adhesive breakage, ie the retention of adhesive residues on the object surfaces, is reduced after removing the adhesive tape residues at a peeling distance. This means at the same time that adhesive residues with a higher adhesion (to the bonding object) can be used than would be possible with a product with release of the bond by peeling off. This makes it possible to produce adhesive tapes with which even objects of high weight can be glued.

According to a particularly preferred embodiment of the adhesive tape according to the invention, a layer A is disposed between the support and the pressure-sensitive adhesive on one side of the adhesive tape and a layer B is arranged on the opposite side between the support and the pressure-sensitive adhesive, both layers A and B being firmly fixed to the adhesive Carrier and the pressure-sensitive adhesive are connected. This means that one of the surfaces of the carrier is fixedly connected to a layer A and the other opposite surface of the carrier is firmly connected to a layer B and the two outer sides of the layers A and B are coated with a pressure-sensitive adhesive.

It is particularly preferred that the layer B (as well as possibly the layer A) has a higher tensile strength than the carrier and in particular by hand is not tearable. The layers A and B may be identical or different, ie be composed of the same or different materials or have the same or different properties, in particular tensile strengths. However, the preferred property profile described above for layer A is also preferred for layer B. According to a preferred embodiment of the adhesive tape according to the invention, therefore, the layer B is characterized in that it is substantially non-stretchable under conditions of use. The material of the layers A and B may be the same or different. Particularly preferred is an embodiment in which both layers A and B are substantially non-stretchable under conditions of use. This is particularly advantageous because with two-sided equipment of the carrier with little stretchable layers, the adhesive residues are removable after splitting the carrier in the same way with little effort.

Preferably, the adhesion between the layer A and the carrier and the layer B and the carrier is greater than the adhesion of the adhesive to the surfaces of the objects bonded together. This is particularly advantageous because it ensures in this way that delamination of the layers A or B from the remains of the carrier is precluded during the detachment process.

According to a further particularly preferred embodiment of the adhesive tape according to the invention, the layers A and / or B consist of a material selected from polyester, polyamide, polyethylene, polypropylene or polyurethane. It is particularly advantageous if the layers A and B are made of films of the above-mentioned polymers. More preferably, layers A and / or B are polyolefins, e.g. Polyethylene, polypropylene or polybutylene, or of polyesters, in particular polyethylene terephthalate (PET). Further suitable films for the layers A and / or B are those based on polystyrene or styrene copolymers or block copolymers, polyvinyl chloride, polycarbonate, polyamide, vinyl copolymers, polyvinyl acetates, Acrylic polymers, olefinic copolymers such as ethylene-methacrylate copolymers, ethylene-vinyl acetate copolymers, acrylonitrile-butadiene-styrene copolymers and ethylene-propylene copolymers, or other copolymers of the above-mentioned copolymers or combinations of the above-mentioned polymers. When polyolefin films are used, either high density polyethylene, low density polyethylene or ultra low density polyethylene as well as polypropylene and polybutylene can be used. Cellulosic films or webs of plastic, paper or fabric may also be used: the films may be substantially unstretched or stretched.

Particularly advantageous is the use of films having a thickness below 50 microns, preferably less than 30 microns, most preferably less than 20 microns. Thus, according to a particularly preferred embodiment, the layers A and / or B of the adhesive tape according to the invention have a thickness of 5 to 20 .mu.m, in particular 10 to 15 .mu.m, on. Films of 12 to 20 .mu.m thickness, in particular 12 .mu.m, in particular polyester films (PET), are particularly preferred since this film thickness on the one hand under application conditions low extensibility is ensured, on the other hand, the adaptability of the adhesive tape to slightly uneven surfaces, such as a woodchip wallpaper , hardly or not strongly affected.

According to a further particularly preferred embodiment of the adhesive tape according to the invention, the layers A and / or B consist of oriented, in particular mono- or bidirectional stretched films. This is particularly advantageous because such pretreated film have a lower extensibility and higher elongation at break than untreated films with the same thickness. When using monodirectionally stretched films, these are preferably mounted on the support so that the stretching direction is parallel to the longitudinal direction of the adhesive tape. This ensures that when using such anisotropic films in the pulling direction, a sufficiently low ductility is achieved. Particularly preferred are bidirectionally stretched films. It is also possible to use multilayer films. It is furthermore preferred if the layers A and / or B of the adhesive tape according to the invention consist of bubble-extruded films.

According to a further preferred embodiment of the adhesive tape according to the invention, the layers A and / or B consist of woven or unwoven fiber material or of a metal foil, in particular an aluminum foil. Particularly preferred is an aluminum foil. The use of fibers on the one hand sufficient tensile strength and low elasticity of the adhesive tape can be achieved and on the other hand, the adaptability to uneven surfaces can be improved. As fiber material, for example, glass fibers, Kevlar®, polyamide, polyester, polyethylene, polypropylene or polyurethane fibers come into consideration. These fibers can either be incorporated in a film or embedded directly in the adhesive. In the case of embedding in the adhesive thus form the layers A and B and the adhesive layers of the adhesive tape one unit. According to another preferred embodiment of the adhesive tape according to the invention, the layers A and / or B comprise a massive polymer film. This offers the advantage that it is essentially non-stretchable and that it achieves an increased stability of the adhesive tape, which enables simplified handling, in particular when the adhesive tape is precisely positioned on an object to be bonded or on a surface.

The connection between the carrier and the layers A and / or B may be z, B. be achieved by gluing. Advantageously, conventional laminating adhesives are used for the bonding. The bonding between the substrate and the layers A and / or B may also be accomplished by an intermediate layer, for example low density polyethylene, e.g. can be melted or remelted during the manufacturing process under the influence of heat.

The surface energy of the surface of the layers A and / or B may be increased in order to achieve adequate anchoring of the support, on the one hand, and the PSAs used, on the other hand. The films used may, for example, be physically pretreated on one or both sides, in particular by corona pretreatment, plasma pretreatment or flame pretreatment. Alternatively, the surface of the films may also be roughened or etched on one or both sides, at least partially using a reagent, or subjected to a fluorine pretreatment. The pretreatment methods can be used alone or in combination.

According to a further preferred embodiment of the adhesive tape according to the invention, the support has a thickness of between 50 μm and 5 mm, in particular 500 to 1500 μm. Thicknesses between 100 and 1000 .mu.m, in particular thicknesses of 400 to 800 .mu.m, are particularly preferred.

According to a further particularly preferred embodiment of the adhesive tape according to the invention, the backing comprises a foam material or foam-containing Carrier material, in particular a polyethylene or polyurethane foam carrier. This is advantageous because the use of foam carriers as a carrier sufficient adaptation of the adhesive tape on uneven surfaces, such as a woodchip wallpaper, is possible and on the other hand, the adhesive tape has sufficient strength. Polyethylene foam supports are particularly preferred. The variety of commercially available polyethylene foam backings can make tapes for very uneven surfaces by using low durometer polyethylene foam backings, as well as very high strength or shear bonding adhesive tapes using very strong foams. For example, homo- and copolymers of ethylene, especially high density polyethylene or low density or ultra low density polyethylene can be used. Other suitable foam-containing carrier materials which can be cleaved under the action of rotational and / or shear forces include polyolefins, such as, for example, polypropylenes, polybethylenes, polystyrenes, polyacrylates, polyvinyl acetates, natural rubber, polychloroprenes, polyvinyl chlorides or other vinyl polymers or olefinic copolymers, such as ethylene-methacrylate. Copolymers, ethylene-vinyl acetate copolymers, acrylonitrile-butadiene-styrene copolymers and ethylene-propylene copolymers and other copolymers of the above-mentioned polymers or combinations or blends of the above-mentioned polymers. Also usable as a foam carrier are multi-layered product constructions consisting of foamed layers and non-foamed layers, eg foam-film coextrudates, in which the foamed layers and the non-foamed coextruded layers can consist of identical or different materials. Furthermore, laminates of several foam-containing carriers and composites of foam-containing carrier can be used with plastic films. The foams can be crosslinked or used uncrosslinked. The foam structure may be closed-cell, open-cell or mixed-cell, wherein the density of the foam is usually 0.02 to 0.4 g / cm ³ , in particular 0.05 to 0.2, particularly preferably about 0.1 g / cm ³ .

Preferably, the foam carrier or the carrier has been subjected to a pretreatment, which provides adequate anchoring of the pressure-sensitive adhesives used or the Intermediate layers A and / or B ensures. Suitable pretreatment processes are essentially the same as those already described above for the pretreatment of the films or layers A and / or B.

According to a particularly preferred embodiment of the adhesive tape according to the invention, the carrier comprises a polyethylene foam carrier which has been filmed on one or two sides. This is advantageous because by the filming of the polyethylene foam carrier, the tensile strength of the adhesive tape and thus the total load capacity can be further increased. Furthermore, the filming of the foam carrier leads to the fact that the adhesive tape residues can be removed from the bonded objects even better by peeling off at angles greater than or equal to 90 °.

The film can be made, for example, by polyethylene or other olefinic polymers. Suitable materials for the coating include the above-mentioned polymers which can be used for a foam carrier.

According to a further particularly preferred embodiment, between the layer A, which is arranged between the support and the pressure-sensitive adhesive, and / or the layer B, which is arranged on the opposite side of the adhesive tape between the support and the pressure-sensitive adhesive, a further thin layer, for example in the form of a filming of the carrier material, which serves to better connect the layers A and / or B and the carrier or to ensure anchoring of the layers A and / or B on the carrier material. Polyethylene, for example low density polyethylene (LDPE), is particularly suitable for such an intermediate layer.

According to a further preferred embodiment of the adhesive tape of the invention, the carrying capacity of the adhesive tape at room temperature (20 ⁰ C), in particular in the bonding on metallic substrates, such as aluminum or steel, with a shear stress at an angle below 10 ° above 0.15 kg / cm ² , in particular above 0.2 kg / cm ² adhesive tape. This information applies to the bonding of objects with a thickness of less than 10 mm, since otherwise the lever forces occurring reduce the load capacity.

As pressure-sensitive adhesives it is possible to use customary pressure-sensitive adhesives known in the art, hot-melt adhesives or curable adhesives, in particular thermally curable pressure-sensitive adhesives. Thus, as pressure-sensitive adhesives, inter alia, natural rubber, butyl rubber, styrene-butadiene copolymers (SB R rubber), acrylonitrile copolymers, polychloroprene, polyisobutylene, polybutadiene, polyisoprene, block copolymers, such as, for example, styrene-isoprene and styrene-isoprene-styrene (SIS) Block copolymers or styrene-butadiene-styrene (SBS) block copolymers, polyesters, polyurethanes, silicones, polyvinyl ethers or acrylates or methacrylates, such as, for example, ethyl acrylates and ethyl methacrylates, propyl acrylates, propyl methacrylates, n-butyl acrylates, n-butyl methacrylates, isobutyl acrylates, 2-methylbutyl acrylates, 2-Ethylhexylacrylate, ^' n-Octylacrylate, I soocty I acrylates, Isooctylmethacrylate, Isononylacrylate, Isodecylacrylate, in particular non-tertiary alkyl alcohols having alkyl radicals of 1 to 12 carbon atoms, in particular 2 to 4 carbon atoms, as well as copolymers of these acrylates are used.

According to a particularly preferred embodiment of the adhesive tape according to the invention, the pressure-sensitive adhesive is an acrylate adhesive or a synthetic rubber adhesive.

The pressure-sensitive adhesives may be extruded or coextruded or applied as a dispersion or solution, for example of acetone, hexane, ethyl acetate or alcohols. The pressure-sensitive adhesives may be applied directly to the tape or formed as a separate layer and then later laminated to the tape. They may contain conventional additives, such as tackifiers, plasticizers, antioxidants, stabilizers, pigments, fiber materials, solvents, film formers, antistatic agents, flame retardants, UV stabilizers, antimicrobial additives (eg zinc oxide), compatibilizing additives, crosslinking agents, organic or inorganic fillers, dyes, Heat stabilizers or other additives, included. Preferably, the additives are used in amounts that do not adversely affect the adhesive properties. When Organic fillers may be, for example, polyethylene, polyesters, polycarbonates, polystyrenes, polyamides, halogenated polymers, poly (methyl methacrylates), or organic fibers such as nylon or polyamide fibers. Examples of inorganic fillers which can be used are pigments, silicas, silicates, for example aluminum silicates or magnesium silicates, calcium carbonate, magnesium carbonate, gypsum, aluminum sulfate, barium sulfate, calcium phosphate, aluminum oxide, titanium dioxide, magnesium oxide, iron oxides, carbon, glass fibers, glass particles, mineral fibers, clay or metal particles become.

The acrylate adhesives used preferably have a low glass transition temperature (Tg), in particular glass transition temperatures lower than about minus 20 ^° C.

The adhesive application weight is in the range of 5 to 200 g / m ² on each side of the adhesive tape. Particular preference is given to ranges from 30 to 100, in particular from 50 to 80, g / m ² . As a result, a thickness of the adhesive layer of about 5 to 200 .mu.m, preferably 30 to 100, in particular 50 to 80 microns is achieved.

The adhesive force (peel strength according to DIN 1939) of the pressure-sensitive adhesive coatings is usually in a range from 0.5 to 10 N / cm, with ranges of 1.5 to 5 N / cm being particularly preferred.

The adhesive tape according to the invention is coated on both sides with a pressure-sensitive adhesive, it being possible for the coating with the pressure-sensitive adhesive to take place on one or both sides of the adhesive tape over the whole area and / or partially. However, a substantially full-surface application of the pressure-sensitive adhesive is preferred, which is interrupted only by the predetermined breaking points or perforations, so that a maximum adhesive force can be achieved. It is possible to use different pressure sensitive adhesives with different adhesive forces on both sides of the adhesive tape. For the simplest possible application, however, it is preferable to use the same pressure-sensitive adhesive on both sides of the adhesive tape. According to a further preferred embodiment of the adhesive tape according to the invention, a peelable film is applied to one or both of the outer sides coated with a pressure-sensitive adhesive. Such a film may for example be made of paper or plastic and, for example, have a siliconized surface, which allows a simple detachment of the adhesive tape from this film (so-called release liner). It is also particularly advantageous if the peelable film is a protective film which protects the adhesive tape against injury.

The applied on one or both outer sides of the film may be as adhesive tape itself have a perforation, which may be the same or different from be the perforation of the ^'tape. If the film is perforated in the same places as the adhesive tape, the air trapped during bonding can escape particularly easily even if the adhesive tape is first glued to a surface in such a way that the side opposite the adhesive surface of the adhesive tape is still covered by the protective film or film the peelable film is provided.

Such a film or protective film is also particularly advantageous for preventing clogging of the perforations in the adhesive tape by dirt or small particles. In order to prevent clogging of the perforations of the adhesive tape, it is of particular advantage if the film or protective film applied on the two outer sides has no perforation or perforation, in contrast to the adhesive tape. has a perforation or perforation which is different from the perforation of the adhesive tape. In this way, a comfortable handling during use is ensured and allows a longer storage of the adhesive tape according to the invention. Surprisingly, it has been found that the perforation in the adhesive tape even during the bonding of an adhesive tape provided on the back with a non-perforated film or protective film on the surface of an object still allows passage of air bubbles or air trapped between the objects to be bonded. Obviously, the air trapped during bonding is pressed through the perforation holes during pressing of the adhesive tape and escapes at the back of the tape between the pressure sensitive adhesive coating and the film. The same applies if the perforations in the film are placed at locations other than the perforations in the adhesive tape.

According to a further particularly preferred embodiment of the adhesive tape of the invention, the adhesive tape has a total thickness of 100 .mu.m to 10 mm, in particular 500 .mu.m to 1, 5 mm. Particular preference is given to thicknesses of approximately 1.0 mm.

The overall thickness of the tape may vary as long as the tape has sufficient integrity to be workable and handleable and provides the desired performance.

The Raurηgewicht of the adhesive tape is preferably 0.1 to 0.5 g / cm ³ , in particular 0.2 to 0.4 g / cm ³ , particularly preferably 0.3 to 0.35 g / cm ³

According to a further preferred embodiment of the adhesive tape according to the invention, the adhesive tape has no handle. This is particularly advantageous because, due to the inventive construction of the adhesive tape, detachment of the adhesive tape residues after splitting of the carrier is possible even without a handle. Thus, it is particularly behind small objects to be bonded, which are to carry a large load, such as hooks, not necessary to reduce the possible adhesive surface by a (non-adhesive) handlebar. A survival of the handle would be desirable even from an aesthetic point of view.

Another object of the present invention is a self-adhesive hook or the like fastening device with a base plate, which is characterized in that one side of the adhesive tape according to the invention is adhered to the base plate of the hook. This means that the side of the base plate opposite the hook is equipped with an adhesive tape according to the invention. The advantage here is that in this way a hook can be equipped with the tape so that the largest possible part of the base plate is covered with the tape. It can the adhesive tape of the invention can be adapted by punching to any conceivable shape of a base plate of a hook or the like fastening device.

Another object of the present invention is the use of the adhesive tape according to the invention for releasably bonding two objects, wherein for releasing the bond of the carrier by the action of rotational and / or shear forces is split into two parts. One of the two objects to be bonded together may in particular be a hook or similar fastening device. After the cleavage of the carrier and the detackifying of the two bonded objects or the object or object from the surface on which it has been bonded, the remains of the adhesive tape or the carrier material as described above in a simple manner by peeling or deflate at an angle preferably greater than or equal to 90 °.

The invention will be explained in more detail below with reference to an example which describes a specific embodiment of the article according to the invention.

Description of the figures:

Fig. 1 = schematic sectional view of the layer structure of an embodiment of the adhesive tape according to the invention Fig. 2 = schematic sectional view of the layer structure of an alternative

Embodiment of the adhesive tape according to the invention FIG. 3 = top view of one side of a bonding surface of an embodiment of the adhesive tape according to the invention FIG. 4 = hook with a base plate and the adhesive tape according to the invention

Figures 1 and 2 show sectional views of the layer structure of two embodiments of the adhesive tape 1 according to the invention, wherein the predetermined breaking points or perforations or cuts are not shown. Figure 1 shows an embodiment in which between the carrier 2 and the pressure-sensitive adhesive 4 is a PET film 3a is arranged as layer A and on the opposite side a polyethylene film 3b as layer B.

FIG. 2 describes an alternative embodiment of the adhesive tape 1 according to the invention in which a PET film 3a is arranged between the carrier 2 and the pressure-sensitive adhesive 4 on both sides.

3 shows the plan view of an inventive adhesive tape 1 with an embodiment of a perforation pattern in the form of a "non-solid X." Straight lines parallel to the surface of the adhesive tape and passing through the cuts 5 would intersect in the middle of the adhesive tape.

To produce the two described embodiments of the adhesive tape of the invention, a polyethylene terephthalate (PET) film is applied to one or both sides of a polyethylene foam. On the opposite side of the tape, a PET film is also applied or a polyethylene film. Alternatively, the polyethylene film may also be made by fusing the polyethylene foam carrier to one side. On the resulting composite, an acrylate adhesive is coated on both sides with the transfer process known to the person skilled in the art. In this process, the adhesive is first coated on a siliconized process film and then laminated on one side of the composite of polyethylene foam and PET film or polyethylene film. Subsequently, a coated with a pressure-sensitive adhesive outside of the tape with a cover liner (protective film) is covered, so that the foam adhesive tape can be wound into a roll. In the next step, these rolls (so-called jumbo rolls) are cut into narrower rolls and a cover liner is also applied to the side of the pressure-sensitive adhesive coating which has not yet been covered. Subsequently, the Kreuzschlitzperforation. The punched liner punctured in this perforation is removed and instead a new cover liner is laminated. The finished tapes are cut into suitable lengths or rectangles of 20 mm x 40 mm in size are punched out and excess adhesive tape material is removed. Figure 4 shows a hook 6 with a base plate 7, on which the adhesive tape 1 according to the invention is applied. The side of the adhesive tape facing away from the hook to be bonded is provided with a protective layer 9 which covers the pressure-sensitive adhesive coating.

Claims

claims

1.' Adhesive tape with a multi-layered structure, which is coated on both sides with a pressure-sensitive adhesive, comprising a carrier, which is cleavable after bonding two objects by the action of rotational and / or shear forces in two parts, characterized in that the adhesive tape at least one point a predetermined breaking point having.

2. Adhesive tape according to claim 1, characterized in that it has a plurality of predetermined breaking points.

3. Adhesive tape according to claim 1 or 2, characterized in that the predetermined breaking points are produced by perforation, in particular by perforation, punching or cuts.

4. Adhesive tape according to one of the preceding claims, characterized in that the predetermined breaking points are generated by passing through all layers perforation, in particular by passing through all layers perforation, punching or cuts.

5. Adhesive tape according to one of the preceding claims, characterized in that the adhesive tape has a plurality of continuous perforations, in particular perforations, punches or cuts.

6. Adhesive tape according to one of the preceding claims, characterized that the predetermined breaking points in Forηn are made of continuous cuts.

7. An adhesive tape according to claim 6, characterized in that the continuous cuts are arranged so that the passing through two cuts in a direction parallel to the Veklebungsoberflächen of the adhesive tape plane axes intersect in the middle of the adhesive tape.

8. An adhesive tape according to claim 7, characterized in that four cuts are arranged so that the axes passing through them in a plane parallel to the adhesive surfaces of the adhesive tape plane lie in a center.

9. Adhesive tape according to one of the preceding claims, characterized in that the two parts, in which the carrier splits under the action of rotational and / or shear forces, adhere to the two bonded objects.

10. Adhesive tape according to one of the preceding claims, characterized in that on at least one side of a layer A between the carrier and the pressure-sensitive adhesive is arranged, which is firmly connected to the carrier and the pressure-sensitive adhesive.

11. An adhesive tape according to claim 10, characterized in that the layer A has a higher tensile strength than the carrier.

12. Adhesive tape according to claim 10 or 11, characterized a layer A is arranged between the carrier and the pressure-sensitive adhesive on one side and a layer B is arranged between the carrier and the pressure-sensitive adhesive on the opposite side, wherein both layers A and B are firmly connected to the carrier and the pressure-sensitive adhesive.

13. An adhesive tape according to claim 12, characterized in that the layer B has a higher tensile strength than the carrier and the layers A and B may be the same or different.

14. Adhesive tape according to one of claims 10 to 13, characterized in that the layers A and / or B consist of a material selected from polyester, polyamide, polyethylene, polypropylene or polyurethane.

15. Adhesive tape according to one of claims 1Q to 14, characterized in that the layers A and / or B consist of oriented, in particular mono- or bidirectionally stretched films or blasextrudierten films.

16. Adhesive tape according to one of the preceding claims, characterized in that the layers A and / or B have a thickness of 5 to 20 .mu.m, in particular 10 to 15 .mu.m, and the carrier has a thickness between 50 .mu.m and 5 mm, in particular 500 microns up to 1 mm.

17. Adhesive tape according to one of the preceding claims, characterized in that the carrier comprises a foam material or foam-containing carrier material, in particular a polyethylene or polyurethane foam carrier.

18. Adhesive tape according to one of the preceding claims, characterized in that the carrier comprises a one-sided or two-sided befilmten polyethylene foam carrier.

19. Adhesive tape according to one of the preceding claims, characterized in that the carrying capacity of the adhesive tape is at a shear stress at an angle below 10 ° above 0.15 kg / cm ² , in particular above 0.2 kg / cm ² tape.

20. Adhesive tape according to 'one of the preceding claims, characterized in that the pressure-sensitive adhesive comprises an acrylate adhesive.

21. Adhesive tape according to one of the preceding claims, characterized in that the adhesive tape has a total thickness of 100 .mu.m to 10 mm, in particular 500 .mu.m to 1, 5 mm.

22. Self-adhesive hook or, like fastening device with a base plate, characterized in that one side of the adhesive tape according to one of the preceding claims is glued to the base plate of the hook.

23. Use of an adhesive tape according to one of claims 1 to 25 for releasable bonding of two objects, characterized in that for releasing the bond, the carrier can be split into two parts by the action of rotational and / or shear forces.