Adhesive tape with a hook unit, adhesive tape system, method and use

Abstract

Shown and described is an adhesive tape (1) comprising a foam layer (5), a pressure-sensitive adhesive layer (7), and a hook unit (9), wherein hook elements of a plurality of hook elements of the hook unit (9) are shaped and arranged such that, when the adhesive tape (1) is connected to an identically constructed further adhesive tape (1) such that the hook elements of the plurality of hook elements of the adhesive tape (1) engage with the hook elements of the plurality of hook elements of the further adhesive tape (1), both for a first pair of adjacent first straight lines and for a second pair of adjacent first straight lines, an overall projection (33), a projection (35) of first hook elements of the corresponding pair onto a projection plane running perpendicular to the second extension direction (27), and a projection (37) of second hook elements of the corresponding pair onto the projection plane,overlaps onto the projection plane with a projection (39) of the hook elements of the further adhesive tape (1) engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair. Furthermore, an adhesive tape system (3), a method, and a use are shown and described.

Description

[0001] The present invention relates to an adhesive tape, an adhesive tape system, a method and a use.

[0002] Adhesive tapes are known from the prior art. Adhesive tapes typically have a pressure-sensitive adhesive layer with which the adhesive tapes can be attached to objects, such as a wall or a picture frame. Using double-sided adhesive tapes, for example, two objects can be bonded together by bonding a first pressure-sensitive adhesive layer on a first side of a double-sided adhesive tape to a first of the two objects, and bonding a second pressure-sensitive adhesive layer on a second side of the double-sided adhesive tape opposite the first side to a second of the two objects.Adhesive tapes are also used to releasably join two objects together. For example, a first adhesive tape is attached to a first object using a first pressure-sensitive adhesive layer of the first adhesive tape, and a second adhesive tape is attached to a second object using a second pressure-sensitive adhesive layer of the second adhesive tape. In these adhesive tapes, for example, the first adhesive tape has barbs on a side facing away from the first pressure-sensitive adhesive layer, and the second adhesive tape has loops on a side facing away from the second pressure-sensitive adhesive layer. Pictures can be releasably attached to a wall using the barbs and loops.

[0003] In general, it is desirable to provide an adhesive tape with which a user of the adhesive tape can re-bond the adhesive tape to another adhesive tape in a particularly simple manner and which ensures a mechanically particularly robust re-bondable connection between the adhesive tape and the other adhesive tape.

[0004] It is therefore the object of the present invention to provide an adhesive tape with which a user of the adhesive tape can releasably connect the adhesive tape to another adhesive tape in a particularly simple manner and a mechanically particularly robust releasable connection is ensured between the adhesive tape and the other adhesive tape.

[0005] According to a first aspect of the invention, the stated object is achieved by an adhesive tape having the features of patent claim 1. The adhesive tape has a foam layer extending along a first plane. Furthermore, the adhesive tape has a pressure-sensitive adhesive layer arranged on a first side of the foam layer and extending along a second plane parallel to the first plane. Furthermore, the adhesive tape has a hook unit arranged on a second side of the foam layer opposite the first side and extending along a third plane parallel to the first plane. The hook unit has a hook base layer extending along the third plane and a plurality of hook elements formed integrally with the hook base layer. The hook elements of the plurality of hook elements have a plurality of first hook elements and a plurality of second hook elements.Each hook element of the plurality of hook elements extends, on a side of the hook unit facing away from the pressure-sensitive adhesive layer, from the hook base layer along a curved section to a free end. Each first hook element is arranged such that the free end of each first hook element points in a first direction of extension running along the third plane. Each second hook element is arranged such that the free end of each second hook element points opposite to the first direction of extension. The hook elements of the plurality of hook elements are arranged such that either first hook elements or second hook elements are arranged one behind the other along each first straight line of a plurality of first straight lines running parallel to one another and along the first direction of extension.The hook elements of adjacent first straight lines, viewed in a second direction of extension running along the third plane and perpendicular to the first direction of extension, are spaced apart from one another by a first distance that is less than an extension of each hook element in the second direction of extension. Viewed along the second direction of extension, a first pair of adjacent first straight lines initially comprises a first straight line with first hook elements and subsequently a first straight line with second hook elements. Furthermore, a second pair of adjacent first straight lines initially comprises a first straight line with second hook elements and subsequently a first straight line with first hook elements.The hook elements of the plurality of hook elements are shaped and arranged such that, when the adhesive tape is connected to an identically constructed further adhesive tape in such a way that the hook elements of the plurality of hook elements of the adhesive tape engage with the hook elements of the plurality of hook elements of the further adhesive tape, both for the first pair of adjacent first straight lines and for the second pair of adjacent first straight lines, an overall projection onto the projection plane, which has a projection of the first hook elements of the corresponding pair onto a projection plane running perpendicular to the second extension direction and a projection of the second hook elements of the corresponding pair onto the projection plane, overlaps with a projection onto the projection plane of the hook elements of the further adhesive tape engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair.

[0006] The term adhesive tape within the meaning of the present invention preferably encompasses all flat structures such as films or film sections extended in two dimensions, tapes with an extended length and a limited width, tape sections, diecuts, labels and the like. The adhesive tape is therefore preferably a diecut, which can also be referred to as an adhesive strip. The diecut preferably has a length of at least 5 mm. Lengths can also be 10 mm, 20 mm, 50 mm, 100 mm or more. The diecut preferably has a width of at least 2 mm. Widths can also be 5 mm, 10 mm, 20 mm, 50 mm or more. The diecut is preferably longer than it is wide, with stretching for redetachment then advantageously taking place along the longitudinal axis.

[0007] As already described, the adhesive tape has the foam layer extending along the first plane. The foam layer ensures that, when the foam layer is attached to an object, such as a wall or a picture frame, using the pressure-sensitive adhesive layer, the hook unit can be displaced relative to the pressure-sensitive adhesive layer within the third plane and / or rotated about a straight line running perpendicular to the third plane. Particularly compared to an adhesive tape without a foam layer, both the pressure-sensitive adhesive layer and the hook unit, and in particular also the hook elements of the hook unit, are subjected to less mechanical stress during the displacement and / or rotation.In addition, the foam layer ensures that when the foam layer of the adhesive tape is attached to an object, such as a picture frame, using the pressure-sensitive adhesive layer of the adhesive tape and the foam layer of the further adhesive tape is attached to an object, such as a wall, using the pressure-sensitive adhesive layer of the further adhesive tape, connecting the adhesive tape to the identically constructed further adhesive tape such that the hook elements of the plurality of hook elements of the adhesive tape engage with the hook elements of the plurality of hook elements of the further adhesive tape is made significantly easier for a user, since the hook units and in particular the hook elements can be aligned more easily relative to one another. The foam layer can also be referred to as a foam carrier. Preferably, the foam layer is deformable and extends in an undeformed state in the first plane.

[0008] As also already described, the adhesive tape has the pressure-sensitive adhesive layer arranged on the first side of the foam layer and extending along the second plane arranged parallel to the first plane. The pressure-sensitive adhesive layer can provide a corresponding full-surface adhesive force, ensuring a bond between the adhesive tape and an object, such as a wall or a picture. The pressure-sensitive adhesive layer is preferably deformable and extends in the second plane in an undeformed state.Preferably, a cover layer is provided, which ensures that the pressure-sensitive adhesive layer is protected from contamination and, when the adhesive tape is to be attached to an object, such as a wall or a picture, can provide a corresponding full-surface adhesive force after removal of the cover layer, ensuring a bond between the adhesive tape and the object. The cover layer can also be referred to as a liner.

[0009] As also already described, the adhesive tape has the hook unit arranged on the second side of the foam layer opposite the first side and extending along the third plane arranged parallel to the first plane. The hook unit is preferably deformable and, in an undeformed state, extends in the third plane. The adhesive tape preferably has a further pressure-sensitive adhesive layer which is connected to both the hook unit and the foam layer and thus connects the hook unit to the foam layer. In the context of the present invention, the pressure-sensitive adhesive layer and the further pressure-sensitive adhesive layer are each preferably understood to mean a layer which comprises an adhesive or consists of an adhesive which has a more or less pronounced permanent tack at room temperature and which, under slight pressure, forms good adhesion to various surfaces.

[0010] As already described, the hook unit has the hook base layer extending along the third level. The hook unit thus extends with its hook base layer along the third level.

[0011] As also already described, the hook unit has a plurality of hook elements formed integrally with the hook base layer. The fact that the hook elements of the plurality of hook elements are formed integrally with the hook base layer ensures that a mechanically particularly robust hook unit and thus a mechanically particularly robust connection between the adhesive tape and another adhesive tape of identical construction is possible. The fact that the hook unit has a plurality of hook elements provides a particularly material-saving adhesive tape, in particular in contrast to an adhesive tape formed with a plurality of mushroom-shaped elements, wherein the mushroom-shaped elements can also be referred to as mushroom elements.

[0012] As also already described, the hook elements of the plurality of hook elements comprise a plurality of first hook elements and a plurality of second hook elements. The hook elements of the plurality of first hook elements, each of which can be referred to as a first hook element, and the hook elements of the plurality of second hook elements, each of which can be referred to as a second hook element, are preferably of identical construction. An identical construction of the first hook elements and second hook elements ensures particularly simple production of the adhesive tape.

[0013] As also already described, each hook element of the plurality of hook elements extends on the side of the hook unit facing away from the pressure-sensitive adhesive layer from the hook base layer along the curved section towards the free end. The fact that each hook element of the plurality of hook elements extends from the hook base layer along the curved section towards the free end ensures that the curved section has an engagement surface that points towards the hook base layer and is provided for engagement with a hook element of a further adhesive tape, wherein the hook element of the further adhesive tape also extends along a curved section towards a free end and also has an engagement surface, but which points in a direction away from the hook base layer of the adhesive tape.

[0014] As also already described, each first hook element is arranged such that the free end of each first hook element points in the first direction of extension running along the third plane. Because each first hook element is arranged such that the free end of the corresponding first hook element points in the first direction of extension, each first hook element can engage with a corresponding hook element of a further adhesive tape, wherein the hook element of the further adhesive tape is arranged such that the free end of the hook element of the further adhesive tape points opposite to the first direction of extension assigned to the adhesive tape. The hook element of the further adhesive tape is preferably a first hook element of the further adhesive tape. Alternatively, the hook element of the further adhesive tape is preferably a second hook element of the further adhesive tape.

[0015] As also already described, each second hook element is arranged such that the free end of each second hook element points opposite to the first direction of extension. Because each second hook element is arranged such that the free end of the corresponding second hook element points opposite to the first direction of extension, each second hook element can engage with a corresponding hook element of a further adhesive tape, wherein the hook element of the further adhesive tape is arranged relative to the adhesive tape such that the free end of the hook element of the further adhesive tape points in the first direction of extension assigned to the adhesive tape. The hook element of the further adhesive tape is preferably a first hook element of the further adhesive tape. Alternatively, the hook element of the further adhesive tape is preferably a second hook element of the further adhesive tape.The fact that each first hook element is arranged such that the free end of each first hook element points in the first direction of extension and each second hook element is arranged such that the free end of each second hook element points opposite to the first direction of extension ensures that a mechanically particularly robust connection can be produced between the first and second hook elements of the adhesive tape and the first and second hook elements of an identically constructed further adhesive tape.

[0016] As also already described, the hook elements of the plurality of hook elements are arranged such that along each first straight line of a plurality of first straight lines running parallel to one another and along the first direction of extension, either first hook elements or second hook elements are arranged one behind the other.The fact that the hook elements of the plurality of hook elements are arranged in such a way that either first hook elements or second hook elements are arranged one behind the other along each first straight line of the plurality of first straight lines running parallel to one another and along the first direction of extension ensures that, viewed along each first straight line, a mechanically particularly robust connection to a further adhesive tape is present, either viewed in the first direction of extension, as is preferably the case for the second hook elements, or viewed opposite to the first direction of extension, as is preferably the case for the first hook elements. In addition, the fact that the first straight lines run parallel to one another ensures that the adhesive tape can be cleaned particularly easily on the side on which the hook unit is arranged.In addition, the fact that the first straight lines run parallel to each other ensures that damage to hooks and contamination of production lines is avoided by the possibility of punching linearly in the spaces between the hooks.

[0017] As also already described, the hook elements are spaced apart from each other by the first distance from adjacent first straight lines in the second extension direction running along the third plane and perpendicular to the first extension direction, which is less than the extension of each hook element in the second extension direction.The fact that the hook elements of adjacent first straight lines are spaced from one another by the first distance, as viewed in the second direction of extension running along the third plane and perpendicular to the first direction of extension, which is less than the extension of each hook element in the second direction of extension, ensures that when hook elements of an identically constructed further adhesive tape engage with the hook elements of the adhesive tape, the adhesive tape and the further adhesive tape are secured relative to one another as viewed along the first direction of extension, since the hook elements of the further adhesive tape cannot be moved between the hook elements of the adhesive tape as viewed along the first direction of extension. The adhesive tape and the further adhesive tape are therefore secured against displacement relative to one another as viewed along the first direction of extension.Preferably, for all adjacent first straight lines, the hook elements of the adjacent first straight lines are spaced apart from one another by the first distance, as seen in the second direction of extension running along the third plane and perpendicular to the first direction of extension, which is less than the extension of each hook element in the second direction of extension, so that a mechanically particularly robust connection between the adhesive tape and another adhesive tape can be ensured.

[0018] As already described, viewed along the second direction of extension, the first pair of adjacent first straight lines initially comprises the first straight line with first hook elements and subsequently the first straight line with second hook elements. As already described, viewed along the second direction of extension, the second pair of adjacent first straight lines initially comprises the first straight line with second hook elements and subsequently the first straight line with first hook elements.The fact that, as viewed along the second direction of extension, the first pair of adjacent first straight lines initially has a first straight line with first hook elements and then a first straight line with second hook elements, and the second pair of adjacent first straight lines initially has a first straight line with second hook elements and then a first straight line with first hook elements, as viewed along the second direction of extension, ensures that when hook elements of an identically constructed further adhesive tape engage with the hook elements of the adhesive tape, the adhesive tape and the further adhesive tape are secured relative to one another both as viewed in the second direction of extension and counter to the second direction of extension. The adhesive tape and the further adhesive tape are therefore secured against displacement relative to one another both as viewed in the second direction of extension and counter to the second direction of extension.

[0019] As also already described, the hook elements of the plurality of hook elements are shaped and arranged such that when the adhesive tape is connected to the identically constructed further adhesive tape in such a way that the hook elements of the plurality of hook elements of the adhesive tape engage with the hook elements of the plurality of hook elements of the further adhesive tape, both for the first pair of adjacent first straight lines and for the second pair of adjacent first straight lines, the overall projection, which comprises the projection of the first hook elements of the corresponding pair onto the projection plane running perpendicular to the second extension direction and the projection of the second hook elements of the corresponding pair onto the projection plane,overlaps the projection plane with the projection of the hook elements of the further adhesive tape engaging the first hook elements of the corresponding pair or the second hook elements of the corresponding pair. Overlapping the overall projection with the projection of the hook elements of the further adhesive tape engaging the first hook elements of the corresponding pair or the second hook elements of the corresponding pair ensures that, when the hook elements of the identically constructed further adhesive tape engage the hook elements of the adhesive tape, the adhesive tape and the further adhesive tape are secured relative to one another along the second extension direction.

[0020] In summary, it can be stated that the present invention provides an adhesive tape with which a user of the adhesive tape can releasably connect the adhesive tape to another adhesive tape in a particularly simple manner and a mechanically particularly robust releasable connection is ensured between the adhesive tape and the other adhesive tape.

[0021] In one embodiment, the foam layer comprises polyethylene (PE) or is formed from polyethylene. Preferably, the foam layer comprises cross-linked polyethylene (cross-linked PE) or is formed from cross-linked polyethylene. The foam layer preferably consists of cross-linked PE foam. A thickness of the foam layer measured perpendicular to a plane of extension in which the foam layer extends is preferably 400 to 1500 µm, preferably 900 to 1300 µm, particularly preferably 1100 µm. It has been found that a foam layer thickness of 400 to 1500 µm can ensure optimal alignment of the hook unit when connecting to another hook unit and, at the same time, robust attachment of the adhesive tape to an object, such as a wall or a picture. A foam layer thickness of 500 µm has achieved particularly optimal results.

[0022] The adhesive tape preferably comprises at least two layers of pressure-sensitive adhesives, of which a first layer of the two layers is assigned to the first side of the foam layer, and a second layer of the two layers is assigned to the opposite side of the foam layer. The two pressure-sensitive adhesives are preferably identical or, alternatively, preferably different in terms of composition and thickness, but are selected such that they can be detached from the bonding substrate by stretching. Examples of usable pressure-sensitive adhesives are those based on polyacrylates, polysiloxanes, or polydiene rubbers, in particular those based on polyvinylaromatic-polydiene block copolymers.Usable pressure-sensitive adhesives are known, for example, from US 4,024,312 A, DE 33 31 016 C2, WO 92 / 01132 A1, WO 92 / 11333 A1, DE 42 22 849 A1, WO 95 / 06691 A1, DE 195 31 696 A1, DE 197 08 366 A1, DE 196 49 727 A1, DE 196 49 728 A1, DE 196 49 729 A1, DE 197 08 364 A1, DE 197 20 145 A1, DE 198 20 854 A1 and DE 100 03 318 A1.

[0023] In one embodiment, the pressure-sensitive adhesive layer comprises a thermoplastic elastomer or is formed from a thermoplastic elastomer. When the pressure-sensitive adhesive layer or a further pressure-sensitive adhesive layer is described in connection with the present invention, the pressure-sensitive adhesive layer and the further pressure-sensitive adhesive layer are preferably constructed identically. Alternatively, the pressure-sensitive adhesive layer and the further pressure-sensitive adhesive layer can also have different structures. Preferably, the features, technical effects and / or advantages described in connection with the pressure-sensitive adhesive layer also apply, at least analogously, to the further pressure-sensitive adhesive layer. A thickness of the pressure-sensitive adhesive layer measured perpendicular to a plane of extension in which the pressure-sensitive adhesive layer extends is preferably 100 to 200 µm, preferably 125 to 175 µm, particularly preferably 150 µm.Preferably, a thickness of the further pressure-sensitive adhesive layer measured perpendicular to a plane of extension in which the further pressure-sensitive adhesive layer extends is 100 to 200 µm, preferably 125 to 175 µm, particularly preferably 150 µm.

[0024] The thermoplastic elastomer of the pressure-sensitive adhesive layer can also be referred to as the elastomer component. The pressure-sensitive adhesive layer preferably consists of a special adhesive formulation consisting of the following components. (a) at least one elastomer component of the polydiene-polyvinyl aromatic block copolymer type in a proportion of 35% to 60% by weight, in particular 40% to 55% by weight, based on the total adhesive mass, (b) at least one adhesive resin which is substantially compatible (miscible) with the polydiene blocks, preferably a hydrocarbon resin having a DACP value of at least +5°C and at most +50°C and an MMAP value of at least +50°C and at most +85°C, (c) optionally at least one soft resin in a proportion of 0 wt.% to 15 wt.%, based on the total adhesive, (d) optionally further additives.

[0025] In the context of the present invention, “consisting of” means that a formulation or adhesive contains only the compounds or components mentioned and no other ingredients are present. (a) Elastomer (block copolymer)

[0026] The elastomer component (block copolymer component) used is preferably a polydiene-polyvinylaromatic block copolymer or a mixture of various polydiene-polyvinylaromatic block copolymers, preferably at least 90 wt.% (based on the total block copolymer content). This polydiene-polyvinylaromatic block copolymer or these polydiene-polyvinylaromatic block copolymers are those that contain polymer blocks predominantly formed from vinylaromatics (A blocks), preferably styrene, and those predominantly formed by polymerization of 1,3-butadiene or isoprene (B blocks). Polybutadiene-polystyrene block copolymers (SBS) and polyisoprene-polystyrene block copolymers (SIS) are particularly suitable. SBS block copolymers are preferred for the purposes of this invention due to their greater stability against external influences such as ozone compared to polyisoprene block copolymers (SIS).

[0027] The elastomer mixture contains at least one polydiene-polyvinylaromatic block copolymer consisting of an A block and a B block, the so-called diblock copolymer. Diblock copolymers contribute to the tack and flowability of the adhesive. The elastomer mixture also contains a triblock copolymer or a higher multiblock copolymer with at least two A blocks and at least one B block. As a triblock copolymer, this can have a linear ABA structure. Radial block copolymers, as well as star-shaped and linear multiblock copolymers, can also be used. Triblock and multiblock copolymers contribute to the cohesion and tensile strength of the adhesive. Several different diblock copolymers can be used. Several triblock and / or multiblock copolymers can be used. The total block copolymer content in the adhesive is at least 35 wt.% and at most 60 wt.%, preferably at least 40 wt.% and at most 55 wt.%.Significantly lower proportions of elastomer or thermoplastic elastomer lead to insufficient cohesion, which manifests itself in reduced holding power and / or reduced tear strength during the release process carried out under stretching. Significantly higher proportions of elastomer or thermoplastic elastomer lead to a drop in bond strength, particularly on non-polar substrates such as non-polar paint. The proportion of diblock copolymers based on the total block copolymer content in the adhesive formulation is at least 0 wt.% and at most 55 wt.%, preferably at least 10 wt.% and at most 50 wt. Significantly higher diblock proportions lead to insufficient cohesion, which manifests itself in reduced holding power and / or reduced tear strength during the release process carried out under stretching.Significantly lower diblock proportions lead to a decrease in bond strength, especially on non-polar substrates such as non-polar paint. Accordingly, the proportion of tri- or higher multiblock copolymers ranges from 45 wt.% to 100 wt.%, preferably 50 wt.% to 90 wt.%, based on the total block copolymer content. Among the tri- or higher multiblock copolymers, triblock copolymers are particularly preferred.

[0028] The weight-average molar mass (measured according to Test I) of the block copolymers is between 50,000 g / mol and 500,000 g / mol, preferably between 75,000 g / mol and 200,000 g / mol. The proportion of vinyl aromatic blocks in the block copolymers can vary from block copolymer type to block copolymer type in the formulation, but is typically at least 15 wt. %, preferably at least 25 wt. %, and at most 40 wt. %, preferably at most 35 wt. An excessively low polyvinyl aromatic content leads to insufficient physical crosslinking, which is created in the polydiene block copolymers by microphase separation. Physical crosslinking is important for holding power and tear strength. In contrast, an excessively high polyvinyl aromatic content results in the adhesive losing its tackiness.

[0029] The block copolymers of the pressure-sensitive adhesives preferably have polystyrene end blocks as A blocks. Instead of the preferred polystyrene blocks, polymer blocks based on other aromatic-containing homopolymers and copolymers (preferably C8 to C12 aromatics) with glass transition temperatures greater than 75 °C, such as α-methylstyrene-containing aromatic blocks, can also be used as vinylaromatics. Furthermore, identical or different A blocks can also be included. Glass transition temperatures are determined according to Test II.

[0030] In the context of this invention, A blocks are also referred to as "hard blocks." B blocks are also referred to as "soft blocks" or "elastomer blocks." This reflects the inventive selection of the blocks according to their glass transition temperatures (for A blocks at least 40 °C, in particular at least 60 °C, and for B blocks up to a maximum of -50 °C, in particular a maximum of -80 °C). These figures refer to the pure, unblended block copolymers.

[0031] The polydiene block copolymers resulting from the A and B blocks can contain identical or different B blocks with regard to microstructure (relative ratio of the monomer linkage types possible for polybutadiene 1,4-cis, 1,4-trans, 1,2-vinyl: preferred is a 1,4-content (cis + trans) of > 75%, very preferably of > 85% based on the polybutadiene blocks and a 1,4-cis-content of > 40% based on the polybutadiene blocks; or relative ratio of the monomer linkage types possible for polyisoprene 1,4-cis, 1,4-trans, 1,2-, 3,4-: preferred is a 1,4-content (cis + trans) of > 75%, very preferably of > 85% based on the polyisoprene blocks and a 1,4-cis-content of > 40% based on the polybutadiene blocks) and / or chain length.A high proportion of 1,4-linkage and in particular 1,4-cis-linkage of the monomer units in the polydiene blocks leads to advantageous tensile / elongation characteristics, resulting in sufficient extensibility, which is particularly important for residue-free redetachment under stretching. (b) Adhesive resin

[0032] Adhesive resins are preferably special compounds with a low molecular weight compared to the elastomers or thermoplastic elastomers, usually with a molecular weight (Test I) Mw < 5,000 g / mol. Typically, the molecular weight Mw is from 500 to 5,000 g / mol, preferably from 500 to 2,000 g / mol. The at least one adhesive resin has a DACP value (according to Test III) of at least about +5°C and at most about +50°C, preferably of at most about +45°C, and an MMAP value (according to Test IV) of at least about +50°C and at most about +85°C, preferably of at most about +80°C. With appropriately selected adhesive resins, compatibility with the polybutadiene blocks and incompatibility with polyvinyl aromatic blocks can be expected to be favorable within the meaning of this invention. The adhesive resin preferably has a resin softening temperature (according to Test V) of at least about 90 °C, preferably of at least about 110 °C, and at most +140 °C, preferably of at most +120 °C.The adhesive resin used is preferably a hydrocarbon resin. If polyisoprene block copolymers are used, adhesive resins with a DACP of up to 60 °C and an MMAP of up to 100 °C can also be used.

[0033] Excessive polarity (too low DACP values) leads to incipient compatibility with the vinyl aromatic blocks, which can lead to a reduction in cohesion and thus in tensile strength. Excessive polarity (too high DACP values) leads to incompatibility of the adhesive resin with the soft block and thus to a loss of pressure-sensitive adhesive.

[0034] Excessive aromaticity (too low MMAP values) leads to incipient compatibility with the vinyl aromatic blocks, which can lead to a reduction in cohesion and thus in tensile strength. Excessive aromaticity (too high MMAP values) leads to incompatibility of the adhesive resin with the soft block and thus to a loss of pressure-sensitive adhesive.

[0035] The resins are preferably selected from the resin classes of (partially) hydrogenated aromatically modified C5 resins, polyterpene resins (made from α-pinene, β-pinene, δ-limonene, or mixtures of these starting materials), partially hydrogenated C9 resins, (partially) hydrogenated aromatically modified α-pinene resins, (partially) hydrogenated aromatically modified β-pinene resins, (partially) hydrogenated aromatically modified δ-limonene resins, and (partially) hydrogenated aromatically modified dipentene resins. Styrene is preferred for aromatic modification. Polyterpene resins are very preferred. (c) Optional soft resins

[0036] The optionally usable soft resin serves for the final fine-tuning of the cohesion / adhesion balance. It is very preferably a soft resin or soft resin mixture with a melt viscosity at 25 °C and 1 Hz of at least 25 Pa*s, preferably at least 50 Pa*s, and a softening temperature of <25 °C. The melt viscosity is determined according to Test VI. The soft resin can be a rosin-based or, very preferably, a hydrocarbon-based soft resin. The soft resin or soft resin mixture is used in a proportion of 0 wt. %, preferably at least 5 wt. % and at most 15 wt. %, particularly preferably at most 12 wt. %, based on the total adhesive composition. An excessively high proportion of soft resin leads to a reduction in cohesion, which is reflected in the holding power and tensile strength.

[0037] Conventional low-viscosity plasticizers such as mineral oils can be used for the purposes of this invention, but are not preferred. Their proportion in the overall formulation is preferably no more than 3% by weight. (d) Optional additional additives

[0038] Further additives that can be added to the adhesive include protective agents. These include primary and secondary anti-aging agents, light and UV stabilizers, and flame retardants, as well as fillers, dyes, and pigments. The adhesive can thus be colored as desired and can be white, gray, or black.

[0039] Typical additive usage amounts are up to 1 wt.% based on the total adhesive composition. Age inhibitors that do not leave colored residues on bonding substrates are particularly advantageous (see the prior art of EP 1 341 862 B1).

[0040] Fillers can be added in higher doses, typically up to 5 wt.% based on the total adhesive composition.

[0041] The following additives can typically be used: • primary antioxidants such as sterically hindered phenols • secondary antioxidants, such as phosphites or thioethers • Process stabilizers such as C radical scavengers • Flame retardants • Light stabilizers such as UV absorbers or sterically hindered amines • Dyes and / or pigments (such as carbon black) • Processing aids • (Nano)fillers such as silicon dioxide, aluminum oxide, titanium dioxide or layered silicates, as well as color pigments and dyes (for transparent but specifically colored designs) and optical brighteners • Endblock reinforcing resins and • optionally further polymers, preferably of an elastomeric nature; correspondingly usable elastomers include, among others, those based on pure hydrocarbons, for example polybutadiene, chemically substantially saturated elastomers such as saturated ethylene-propylene copolymers, α-olefin copolymers, polyisobutylene, butyl rubber, ethylene-propylene rubber, and chemically functionalized hydrocarbons such as halogen-containing, acrylate-containing, allyl- or vinyl ether-containing polyolefins.

[0042] In one embodiment, the hook unit comprises polyethylene (PE) or is formed from polyethylene (PE). Preferably, the hook unit comprises a polymer blend or is formed from a polymer blend. The polymer blend preferably comprises several polymer components that are in a purely physically mixed state and in which no new chemical bonds are present between the macromolecules of the polymer components. One component of the polymer blend is preferably PE.

[0043] The above statements regarding pressure-sensitive adhesives are to be understood merely as an example of those advantageous in connection with the present invention and in no way exclude other pressure-sensitive adhesives.

[0044] In one embodiment, as viewed along the second direction of extension, each pair of adjacent first straight lines either initially comprises a first straight line with first hook elements and subsequently a first straight line with second hook elements, or initially comprises a first straight line with second hook elements and subsequently a first straight line with first hook elements. As a result of the fact that, as viewed along the second direction of extension, each pair of adjacent first straight lines either initially comprises a first straight line with first hook elements and subsequently a first straight line with second hook elements, or initially comprises a first straight line with second hook elements and subsequently a first straight line with first hook elements, a particularly mechanically robust connection between the adhesive tape and the further adhesive tape is ensured.

[0045] In one embodiment, the hook elements of the plurality of hook elements are shaped and arranged such that, when the adhesive tape is connected to an identically constructed further adhesive tape such that the hook elements of the plurality of hook elements of the adhesive tape engage with the hook elements of the plurality of hook elements of the further adhesive tape, for each pair of adjacent first straight lines which, viewed along the second extension direction, either initially has a first straight line with first hook elements and subsequently a first straight line with second hook elements or initially has a first straight line with second hook elements and subsequently a first straight line with first hook elements, an overall projection which comprises a projection of the first hook elements of the corresponding pair onto the projection plane and a projection of the second hook elements of the corresponding pair onto the projection plane,overlaps the projection plane with a projection of the hook elements of the additional adhesive tape engaging the first hook elements of the corresponding pair or the second hook elements of the corresponding pair. The fact that, for each pair of adjacent first straight lines, the overall projection overlaps the projection of the hook elements of the additional adhesive tape engaging the first hook elements of the corresponding pair or the second hook elements of the corresponding pair onto the projection plane ensures a particularly robust mechanical connection between the adhesive tape and the additional adhesive tape.

[0046] In one embodiment, each projection section of the overall projection, which is defined by a projection of a first hook element of a first straight line with first hook elements of a pair of adjacent first straight lines onto the projection plane and by a projection of a second hook element of a first straight line with second hook elements of the pair of adjacent first straight lines onto the projection plane, overlapping this projection, has a maximum extension as seen along the first extension direction that is greater than a second distance as seen along the first extension direction between two sections seen along the first extension direction with a corresponding minimum extension of two projection sections arranged adjacently along the first extension direction.The fact that each projection section, viewed along the first direction of extent, has the maximum extent which is greater than the second distance, viewed along the first direction of extent, between two sections viewed along the first direction of extent with the corresponding minimum extent of two projection sections arranged adjacently along the first direction of extent ensures that the adhesive tape and the further adhesive tape can be mechanically connected to one another in a particularly robust manner, in particular the adhesive tape and the further adhesive tape can be secured in a particularly simple manner against relative displacement to one another along the second direction of extent.

[0047] In one embodiment, each projection section of the overall projection, which is defined by a projection of a first hook element of a first straight line with first hook elements of a pair of adjacent first straight lines onto the projection plane and by a projection of a second hook element of a first straight line with second hook elements of the pair of adjacent first straight lines onto the projection plane, which projection overlaps this projection, has a minimum extension as seen along the first direction of extension that is greater than a third distance as seen along the first direction of extension between two sections seen along the first direction of extension with a corresponding maximum extension of two projection sections arranged adjacently along the first direction of extension.The fact that each projection section, viewed along the first direction of extent, has the minimum extent which is greater than the third distance, viewed along the first direction of extent, between the two sections viewed along the first direction of extent with the corresponding maximum extent of the two projection sections arranged adjacently along the first direction of extent ensures that the adhesive tape and the further adhesive tape can be mechanically connected to one another in a particularly robust manner, in particular the adhesive tape and the further adhesive tape can be secured in a particularly simple manner against relative displacement to one another along the second direction of extent.

[0048] The adhesive tape preferably has a grip tab, which can also be referred to as a grip region. The grip tab is preferably non-sticky on a side corresponding to the first side of the foam layer and on a side corresponding to the second side of the foam layer. This section or region serves as a grip tab that can be pulled to achieve stretching, particularly in a bonding plane, and is therefore preferably non-pressure-sensitively coated on both sides, particularly by applying layers of metal, plastic, or paper. However, the grip tab can also be created by irradiation, powdering, or neutralization of the adhesive. Alternatively, a varnish can be applied to the corresponding locations. In addition, the surface can be modified by chemical treatment such as etching to create non-sticky zones.

[0049] According to a second aspect of the invention, the stated object is achieved by an adhesive tape system having the features of patent claim 9. The adhesive tape system comprises two adhesive tapes connected to one another. Each of the two adhesive tapes, a first adhesive tape and a second adhesive tape, is an adhesive tape according to the first aspect of the invention. The first adhesive tape and the second adhesive tape are connected to one another such that the hook elements of the plurality of hook elements of the first adhesive tape engage the hook elements of the plurality of hook elements of the second adhesive tape.In particular, the fact that the first adhesive tape and the second adhesive tape are connected to one another in such a way that the hook elements of the plurality of hook elements of the first adhesive tape engage with the hook elements of the plurality of hook elements of the second adhesive tape ensures that, when the first adhesive tape is connected to the second adhesive tape, an acoustic signal is clearly perceptible to a user of the adhesive tape system, so that the user can be sure that, after perceiving the acoustic signal, the first adhesive tape and the second adhesive tape are connected to one another. The features, technical effects, and / or advantages described in connection with the adhesive tape according to the first aspect of the invention also apply, at least analogously, to the adhesive tape system according to the second aspect of the invention, so that a corresponding repetition is omitted here.

[0050] According to a third aspect of the invention, the stated object is achieved by a method having the features of patent claim 10. The method is provided for producing the adhesive tape according to the first aspect of the invention. The hook unit of the adhesive tape is produced by extrusion. The features, technical effects and / or advantages described in connection with the adhesive tape according to the first aspect of the invention and the features, technical effects and / or advantages described in connection with the adhesive tape system according to the second aspect of the invention also apply at least analogously to the method according to the third aspect of the invention, so that a corresponding repetition is omitted here.

[0051] According to a fourth aspect of the invention, the stated object is achieved by a use having the features of patent claim 11. The use of an adhesive tape according to the first aspect of the invention for attaching a picture to a wall is provided. Preferably, the adhesive tape is first connected to the identically constructed further adhesive tape such that the hook elements of the plurality of hook elements of the adhesive tape engage with the hook elements of the plurality of hook elements of the further adhesive tape. Preferably, a cover layer is then removed from the adhesive tape, and the adhesive tape is applied with the pressure-sensitive adhesive layer to the back of a picture frame enclosing a picture.attached. Preferably, a cover layer is then removed from the additional adhesive tape, and the picture frame is attached to the wall together with the adhesive tape and the additional adhesive tape using the pressure-sensitive adhesive layer of the additional adhesive tape. Due to the design of the adhesive tape and the additional adhesive tape or the adhesive tape system, the picture can now be removed from the wall again, with the adhesive tape remaining connected to the back of the picture frame and the additional adhesive tape remaining connected to the wall. Using the hook elements, the picture frame can be reattached to the wall at any time. As already described, each first hook element is arranged such that the free end of each first hook element points in the first direction of extension, and each second hook element is arranged such that the free end of each second hook element points opposite to the first direction of extension, thereby achieving different levels of separation forces in the longitudinal direction,namely in the first direction of extension, and in the transverse direction, namely in the second direction of extension. Preferably, the adhesive tape is connected to the identically constructed further adhesive tape, the adhesive tape is preferably attached to the back of a picture frame enclosing a picture, and the further adhesive tape is preferably attached to the wall in such a way that both the first direction of extension of the adhesive tape and the first direction of extension of the further adhesive tape run along a holding load direction along which the weight of the picture attached to the wall acts, and both the second direction of extension of the adhesive tape and the second direction of extension of the further adhesive tape run perpendicular to the holding load direction, whereby particularly high holding forces can be provided by the adhesive tape system and, at the same time, easy removal of the picture from the wall is ensured for a user.Because the user only needs to apply minimal force when pivoting the picture frame in a direction perpendicular to the holding load direction. The features, technical effects, and / or advantages described in connection with the adhesive tape according to the first aspect of the invention, the features, technical effects, and / or advantages described in connection with the adhesive tape system according to the second aspect of the invention, and the features, technical effects, and / or advantages described in connection with the method according to the third aspect of the invention also apply at least analogously to the use according to the fourth aspect of the invention, so that a corresponding repetition is omitted here.

[0052] Even if the steps are described in a specific order, the present invention is not limited to this order. Rather, the individual steps can be performed in any meaningful order, in particular at least partially in parallel.

[0053] The test methods already mentioned are briefly described in more detail below. Test I - Molecular Weight, GPC

[0054] The weight-average molecular weight Mw was determined by gel permeation chromatography (GPC). THF was used as the eluent. The measurement was carried out at 23 °C. PSS-SDV, 5 µ, 10 3 Å, ID 8.0 mm × 50 mm. For separation, columns PSS-SDV, 5 µ, 10 3 and 10 4 and 10 6with an ID of 8.0 mm × 300 mm each. The sample concentration was 4 g / l, and the flow rate was 1.0 ml per minute. Measurements were made against PS standards (µ = µm; 1 Å = 10 -10 m).

[0055] GPC is also a suitable measurement method for determining the diblock content if manufacturer information for a block copolymer is not available. For the block copolymers produced by living anionic polymerization that can be used in this invention, the molecular weight distributions are typically sufficiently narrow so that polymer modes that can be assigned to triblock copolymers on the one hand and diblock copolymers on the other hand appear sufficiently resolved in the elugram. The diblock content can then be quantified as the integral of the corresponding molecular weight signal, based on the sum of the integrals of the molecular weight signals of the diblock mode and the other block copolymer modes (triblock mode or mode of a higher block copolymer). Test II - DSC

[0056] The glass transition temperature of polymer blocks in block copolymers was determined using dynamic scanning calorimetry (DSC). For this purpose, approximately 5 mg of the untreated block copolymer samples were weighed into an aluminum crucible (volume 25 µL) and sealed with a perforated lid. A Netzsch DSC 204 F1 was used for the measurement, and the sample was run under nitrogen for inerting. The sample was first cooled to -150 °C, heated at a heating rate of 10 K / min to +150 °C, and cooled again to -150 °C. The subsequent second heating curve was run again at 10 K / min, and the change in heat capacity was recorded. Glass transitions are recognized as steps in the thermogram. The glass transition temperature is evaluated as follows.A tangent is applied to the base line of a thermogram representing heat flow versus temperature at a first temperature interval with a first temperature in which the heat flow is substantially constant, and at a second temperature interval with a second temperature which is greater than the first temperature and in which the heat flow is substantially constant, wherein the first temperature interval has temperatures which are lower than temperatures which lie in a third temperature interval which is defined by a step in the heat flow versus temperature, and wherein the second temperature interval has temperatures which are greater than the temperatures which lie in the third temperature interval.In the step region, a best-fit line is placed parallel to the ordinate so that it intersects the two tangents, creating two surfaces of equal area: a first surface and a second surface (between the tangent, the best-fit line, and the measured curve). The intersection point of the best-fit line positioned in this way with the measured curve gives the glass transition temperature. Test III - DACP value

[0057] The DACP is the diacetone cloud point and is determined in the present invention as follows: 5.0 g of test substance (the adhesive resin sample to be tested) are weighed into a dry sample tube and mixed with 5.0 g of xylene (mixture of isomers, CAS [1330-20-7], > 98.5%, Sigma-Aldrich #320579 or comparable). The test substance is dissolved at 130 °C and then cooled to 80 °C. Any escaped xylene is replaced with additional xylene so that 5.0 g of xylene are present again. Subsequently, 5.0 g of diacetone alcohol (4-hydroxy-4-methyl-2-pentanone, CAS [123-42-2], 99%, Aldrich #H41544 or comparable) are added. The sample tube is shaken until the test substance has completely dissolved. For this purpose, the solution is heated to 100 °C. The sample tube containing the resin solution is then placed in a Chemotronic Cool cloud point meter from Novomatics, where it is heated to 110 °C. Cooling is carried out at a rate of 1.0 K / min.The cloud point is detected optically. The temperature at which the solution reaches 70% turbidity is recorded. The result is expressed in °C. The lower the DACP value, the higher the polarity of the test substance.

[0058] For the determination of DACP values, see also C. Donker, PSTC Annual Technical Seminar, Proceedings, pp. 149-164, May 2001. Test IV - MMAP value

[0059] MMAP is the mixed methylcyclohexane-aniline cloud point, determined using a modified ASTM C 611 method. For the purposes of the present invention, the MMAP value is determined by weighing 5.0 g of test substance, i.e., the adhesive resin sample to be tested, into a dry sample tube and adding 10 mL of dry aniline (CAS [62-53-3], > 99.5%, Sigma-Aldrich #51788 or equivalent) and 5 mL of dry methylcyclohexane (CAS [108-87-2], > 99%, Sigma-Aldrich #300306 or equivalent). The sample tube is shaken until the test substance has completely dissolved. For this purpose, the solution is heated to 100 °C. The sample tube containing the resin solution is then placed in a Chemotronic Cool cloud point meter from Novomatics and heated to 110 °C. Cooling occurs at a rate of 1.0 K / min. The cloud point is detected optically. The temperature at which the solution reaches 70% turbidity is recorded.The result is given in °C. The lower the MMAP value, the higher the aromaticity of the test substance.

[0060] For the determination of MMAP values, see also C. Donker, PSTC Annual Technical Seminar, Proceedings, pp. 149-164, May 2001. Test V - Resin softening temperature

[0061] The adhesive resin softening temperature is carried out according to the relevant methodology known as Ring & Ball, standardized according to ASTM E28. Test VI - Melt viscosity of soft resins

[0062] To determine the melt viscosity of the soft resins, a shear stress sweep was performed in a shear stress-controlled DSR 200 N rheometer from Rheometrics Scientific in rotation. A cone / plate measuring system with a diameter of 25 mm (cone angle 0.1002 rad) was used. The measuring head was air-bearing and suitable for normal force measurements. The gap was 0.053 mm and the measurement temperature was 25 °C. The frequency was varied from 0.002 Hz to 200 Hz, and the melt viscosity was recorded at 1 Hz. Test VII - Tensile Strength

[0063] Dumbbell-shaped test specimens (test bar 5A according to DIN EN ISO 527) are punched from a sample with a thickness of 750 µm. These are equilibrated at 23 °C and 50% relative humidity. A test specimen is clamped into a tensile testing machine at both ends. The test specimen is stretched at a speed of 1000 mm / min, and the force is recorded. The tensile strength is the force relative to the cross-sectional area of ​​the specimen (web width × layer thickness) recorded at the elongation at break. It is expressed in MPa. Test VIII - Roughness

[0064] The surface roughness of the grip layer was determined using a Bruker Contour GT®3D white-light interferometer optical microscope. ISO 25178-602 was used. The instrument was operated in vertical scanning (VSI) mode. A 50x objective and a 1x field lens were used, resulting in a 50x magnification. The field of view was 317 µm × 238 µm. The evaluated surface roughness S also refers to this area. a From the optically recorded height profile, the surface roughness was calculated from the raw data according to ISO 25178-2:2012 (E) Section 4.1.7 as the mean value of the 3D profile S a received. S ais the arithmetic mean of the height values ​​z of all measured points located in the x,y plane of the field of view. Three measurements were performed, and the mean value of the individual measurements is given in nm. The distance between the measured points was 0.5 µm in both the x and y directions.

[0065] Further features, advantages, and possible applications of the present invention will become apparent from the following description of the exemplary embodiments and the figures. All described and / or illustrated features, individually and in any combination, constitute the subject matter of the invention, regardless of their composition in the individual claims or their references. In the figures, the same reference numerals represent the same or similar objects. Fig. 1 shows a schematic representation of a section of a first embodiment of an adhesive tape according to the invention, Fig. 2 shows a schematic representation of a section of a first embodiment of an adhesive tape system according to the invention with the Fig. 1 schematically and partially illustrated first embodiment of the adhesive tape according to the invention, Fig. Figure 3 shows a schematic representation of a section of the first embodiment of the adhesive tape system according to the invention with further details compared to Fig. 2, Fig. 4 shows a schematic representation of a section of a second embodiment of the adhesive tape according to the invention, Fig. Figure 5 shows a schematic representation of a section of the Fig. 1 schematically and partially illustrated first embodiment of the adhesive tape according to the invention, Fig. 6 shows a schematic representation of a section of a second embodiment of the adhesive tape according to the invention, Fig. Figure 7 shows a schematic representation of a section of a third embodiment of the adhesive tape according to the invention, and Fig. 8 shows a schematic representation of a section of a second embodiment of the adhesive tape system according to the invention.

[0066] Fig. 1 shows a schematic representation of a section of a first embodiment of an adhesive tape 1 according to the invention, Fig. 2 shows a schematic representation of a section of a first embodiment of an adhesive tape system 3 according to the invention with the Fig. 1 schematically and sectionally illustrated first embodiment of the adhesive tape 1 according to the invention, Fig. Figure 3 shows a schematic representation of a section of the first embodiment of the adhesive tape system 3 according to the invention with further details compared to Fig. 2, Fig. 4 shows a schematic representation of a section of a second embodiment of the adhesive tape 1 according to the invention, Fig. Figure 5 shows a schematic representation of a section of the Fig. 1 schematically and sectionally illustrated first embodiment of the adhesive tape 1 according to the invention, Fig. 6 shows a schematic representation of a section of a second embodiment of the adhesive tape 1 according to the invention, Fig. 7 shows a schematic representation of a section of a third embodiment of the adhesive tape 1 according to the invention, and Fig. 8 shows a schematic representation of a section of a second embodiment of the adhesive tape system 3 according to the invention.

[0067] Each adhesive tape 1, which can also be referred to as a hook tape, has a foam layer 5 extending along a first plane. In addition, each adhesive tape 1 has a pressure-sensitive adhesive layer 7 arranged on a first side of the foam layer 5 and extending along a second plane parallel to the first plane. In addition, each adhesive tape 1 has a hook unit 9 arranged on a second side of the foam layer 5 opposite the first side and extending along a third plane parallel to the first plane. In addition, each adhesive tape 1 has a further pressure-sensitive adhesive layer 11, which is connected to both the hook unit 9 and the foam layer 5, thus connecting the hook unit 9 to the foam layer 5. Fig. 1 to 4, a cover layer 13 is also shown. The cover layer 13 ensures, on the one hand, that the pressure-sensitive adhesive layer 7 is protected from contamination and, on the other hand, when the adhesive tape 1 is to be attached to an object, such as a wall or a picture, after removal of the cover layer 13, can provide a corresponding full-surface adhesive force that ensures a bond between the adhesive tape 1 and the object. The cover layer 13 can also be referred to as a liner.

[0068] The hook unit 9 has a hook base layer 15 extending along the third plane and a plurality of hook elements formed integrally with the hook base layer 15. The fact that the plurality of hook elements are formed integrally with the hook base layer 15 ensures that a mechanically particularly robust hook unit 9 and thus a mechanically particularly robust connection between the adhesive tape 1 and an identically constructed further adhesive tape 1 is possible. The fact that the hook unit 9 has the plurality of hook elements provides a particularly material-saving adhesive tape, in particular in contrast to an adhesive tape formed with a plurality of mushroom-shaped elements, wherein the mushroom-shaped elements can also be referred to as mushroom elements. The plurality of hook elements has a plurality of first hook elements and a plurality of second hook elements.For each adhesive tape 1 shown, the hook elements of the plurality of first hook elements, each of which can be referred to as the first hook element 17, and the hook elements of the plurality of second hook elements, each of which can be referred to as the second hook element 19, are constructed identically. An identical construction of the first hook elements and second hook elements ensures particularly simple production of the adhesive tape 1. However, the hook elements of the plurality of first hook elements and the hook elements of the plurality of second hook elements are arranged differently, which will be discussed in more detail later.

[0069] Each hook element of the plurality of hook elements extends, on a side of the hook unit 9 facing away from the pressure-sensitive adhesive layer 7, from the hook base layer 15 along a curved section 21 to a free end 23. The fact that each hook element of the plurality of hook elements extends from the hook base layer 15 along the curved section 21 to the free end 23 ensures that the curved section 21 has an engagement surface that points towards the hook base layer 15 and is provided for engagement with a hook element of a further adhesive tape 1, wherein the hook element also extends along a curved section 21 to a free end 23 and also has an engagement surface, which, however, points in a direction away from the hook base layer 15 of the adhesive tape 1. Such an engagement is illustrated, for example, in Fig. 2 shown.

[0070] Each first hook element 17 is arranged such that the free end 23 of each first hook element 17 points in a first extension direction 25 running along the third plane. Fig. 2 rightward pointing first extension direction 25 refers to the Fig. 2 adhesive tape 1 shown below and the Fig. 2 left-pointing first extension direction 25 refers to the Fig. 2 further adhesive tape 1 shown above. Each adhesive tape 1 is therefore assigned a corresponding first extension direction 25. Related to the Fig. 2 below, each free end 23 of a corresponding first hook element 17 has its end 24 arranged along the Fig. 2 below shown adhesive tape 1 associated first extension direction 25 and each free end 23 of a corresponding first hook element 17 of the Fig. 2 adhesive tape 1 shown above has, contrary to the Fig. 2 the first extension direction 25 assigned to the adhesive tape 1 shown below.

[0071] Each second hook element 19 is arranged such that the free end 23 of each second hook element 19 points opposite to the first extension direction 25. In Fig. 3 are exemplary second hook elements of the Fig. 3 below. Each second hook element 19 has a corresponding free end 23 which is opposite to the direction shown in Fig. 3 shown adhesive tape 1 associated with the first extension direction 25. The Fig. 3 second hook elements shown as examples are not in the image plane of the Fig. 3, but solely for a simplified description of the adhesive tape 1 in Fig. 3. As will be explained in more detail later in connection with the Fig. 5 to 8, each in Fig. 3 shown second hook element 19 perpendicular to the image plane of the Fig. 3 relative to each in Fig. 3. The fact that each first hook element 17 is arranged such that the free end 23 of each first hook element 17 points in the first extension direction 25 and each second hook element 19 is arranged such that the free end 23 of each second hook element 19 points opposite to the first extension direction 25 ensures that a mechanically particularly robust connection can be produced between the first and second hook elements of the adhesive tape 1 and the first and second hook elements of an identically constructed further adhesive tape 1.In addition, by arranging each first hook element 17 such that the free end 23 of each first hook element 17 points in the first extension direction 25 and arranging each second hook element 19 such that the free end 23 of each second hook element 19 points opposite to the first extension direction 25, different separation forces can be achieved in the longitudinal direction, namely in the first extension direction 25, and in the transverse direction, namely in the second extension direction 27.

[0072] The Fig. 2 and Fig. 3 rightward pointing first extension direction 25 refers to the corresponding in the Fig. 2 and Fig. 3 adhesive tape 1 shown below and the Fig. 2 and Fig. 3 left-pointing first extension direction 25 refers to the corresponding in the Fig. 2 and Fig. 3 each adhesive tape 1 shown above. Each adhesive tape 1 is therefore assigned a corresponding first extension direction 25. In relation to the corresponding in the Fig. 2 and Fig. 3 each adhesive tape 1 shown below has each free end 23 of a corresponding first hook element 17 of the adhesive tape 1 shown below along the Fig. 2 and Fig. 3 each associated with the adhesive tape 1 shown below, and each free end 23 of a corresponding first hook element 17 of the corresponding Fig. 2 and Fig. 3 of the adhesive tape 1 shown above has, contrary to the Fig. 2 and Fig. 3 each associated with the first extension direction 25 of the adhesive tape 1 shown below. Each hook element of the plurality of hook elements differs in particular from a mushroom element in that each hook element extends along a corresponding curved section 21 towards a free end 23 which points in a corresponding extension direction, and the mushroom element extends along a stem section perpendicular to an extension plane of an adhesive tape 1 towards a head section which projects beyond the stem section in a plane running parallel to the extension plane of the adhesive tape 1 and can thus engage with a head section of another adhesive tape 1 all the way around the head section.

[0073] The hook elements of the plurality of hook elements are arranged such that along each first straight line of a plurality of first straight lines running parallel to one another and along the first extension direction 25, either first hook elements or second hook elements are arranged one behind the other. This structure of the adhesive tape 1 according to the invention is shown in the Fig. 5, Fig. 6 and Fig. 7 schematically shown. Due to the fact that the hook elements of the plurality of hook elements are arranged in such a way that either first hook elements or second hook elements are arranged one behind the other along each first straight line of the plurality of first straight lines running parallel to one another and along the first direction of extension 25, it is ensured that, viewed along each first straight line, a mechanically particularly robust connection is provided with a further adhesive tape 1, either viewed in the first direction of extension 25, as is the case for the second hook elements, or viewed opposite to the first direction of extension 25, as is the case for the first hook elements. Furthermore, due to the fact that the first straight lines run parallel to one another, it is ensured that the adhesive tape 1 can be cleaned particularly easily on the side on which the hook unit 9 is arranged.In addition, the fact that the first straight lines run parallel to each other ensures that damage to hooks and contamination of production lines is avoided by the possibility of punching linearly in the spaces between the hooks.

[0074] In addition, the Fig. 1 to 5 and 7 and 8, the hook elements of the plurality of hook elements are arranged such that first hook elements and second hook elements are arranged alternately one behind the other along every second straight line of a plurality of second straight lines running parallel to one another and along the second extension direction 27. The fact that the second straight lines run parallel to one another ensures that the adhesive tape 1 can be cleaned particularly easily on the side on which the hook unit 9 is arranged. Furthermore, the fact that the second straight lines run parallel to one another ensures that damage to hooks and contamination of production lines is avoided by the possibility of punching linearly in the spaces between the hooks.

[0075] The hook elements of adjacent first straight lines are spaced apart from one another by a first distance 29, viewed in a second extension direction 27 running along the third plane and perpendicular to the first extension direction 25, which is less than an extension 31 of each hook element in the second extension direction 27.The fact that the hook elements of adjacent first straight lines are spaced from one another by the first distance 29, as seen in a second direction of extension 27 running along the third plane and perpendicular to the first direction of extension 25, which is less than the extension 31 of each hook element in the second direction of extension 27, ensures that when hook elements of an identically constructed further adhesive tape 1 engage with the hook elements of the adhesive tape 1, the adhesive tape 1 and the further adhesive tape 1 are secured relative to one another as seen along the first direction of extension 25, since the hook elements of the further adhesive tape 1 cannot be moved between the hook elements of the adhesive tape 1 as seen along the first direction of extension 25. The adhesive tape 1 and the further adhesive tape 1 are therefore secured against displacement relative to one another as seen along the first direction of extension 25.In the examples shown, this applies to all neighboring first lines.

[0076] Viewed along the second extension direction 27, a first pair of adjacent first straight lines initially comprises a first straight line with first hook elements and subsequently a first straight line with second hook elements. Viewed along the second extension direction 27, a second pair of adjacent first straight lines initially comprises a first straight line with second hook elements and subsequently a first straight line with first hook elements.

[0077] The hook elements of the plurality of hook elements are shaped and arranged such that, when the adhesive tape 1 is connected to an identically constructed further adhesive tape 1 in such a way that the hook elements of the plurality of hook elements of the adhesive tape 1 engage with the hook elements of the plurality of hook elements of the further adhesive tape 1, both for the first pair of adjacent first straight lines and for the second pair of adjacent first straight lines, an overall projection 33, which has a projection 35 of the first hook elements of the corresponding pair onto a projection plane running perpendicular to the second extension direction 27 and a projection 37 of the second hook elements of the corresponding pair onto the projection plane,overlaps the projection plane with a projection 39 of the hook elements of the further adhesive tape 1 engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair. The described projection plane runs parallel to the image planes in the , Fig. 1 to 4 and perpendicular to the image planes in the Fig. 5 to 8. The design of the overall projection 33, the projection 35 of the first hook elements, the projection 37 of the second hook elements and the projection 39 of the hook elements of the further adhesive tape 1 corresponds to the design of the schematic representation of the corresponding hook elements, a section of which is shown in Fig. 3. The total projection 33, the projection 35 of the first hook elements, the projection 37 of the second hook elements and the projection 39 of the hook elements of the further adhesive tape 1 are therefore in Fig. 3 with the corresponding reference numerals. Overlapping the overall projection 33 with the projection 39 of the hook elements of the further adhesive tape 1 engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair ensures that, when the hook elements of the identically constructed further adhesive tape 1 engage with the hook elements of the adhesive tape 1, the adhesive tape 1 and the further adhesive tape 1 are secured relative to one another along the second extension direction 27.The fact that, as seen along the second direction of extension 27, the first pair of adjacent first straight lines initially has a first straight line with first hook elements and then a first straight line with second hook elements, and the second pair of adjacent first straight lines initially has a first straight line with second hook elements and then a first straight line with first hook elements, as seen along the second direction of extension 27, ensures that when hook elements of an identically constructed further adhesive tape 1 engage with the hook elements of the adhesive tape 1, the adhesive tape 1 and the further adhesive tape 1 are secured relative to one another both as seen in the second direction of extension 27 and also opposite to the second direction of extension 27.The adhesive tape 1 and the further adhesive tape 1 are thus secured against displacement relative to one another both in the second extension direction 27 and opposite to the second extension direction 27.

[0078] For each adhesive tape 1, as viewed along the second direction of extension 27, each pair of adjacent first straight lines either initially has a first straight line with first hook elements and subsequently a first straight line with second hook elements, or initially has a first straight line with second hook elements and subsequently a first straight line with first hook elements. The fact that, as viewed along the second direction of extension 27, each pair of adjacent first straight lines either initially has a first straight line with first hook elements and subsequently a first straight line with second hook elements, or initially has a first straight line with second hook elements and subsequently a first straight line with first hook elements, ensures a particularly mechanically robust connection between the adhesive tape 1 and the further adhesive tape 1.

[0079] In addition, in each adhesive tape 1, the hook elements of the plurality of hook elements are shaped and arranged such that, when the adhesive tape 1 is connected to an identically constructed further adhesive tape 1 such that the hook elements of the plurality of hook elements of the adhesive tape 1 engage with the hook elements of the plurality of hook elements of the further adhesive tape 1, for each pair of adjacent first straight lines which, viewed along the second extension direction 27, either initially has a first straight line with first hook elements and subsequently a first straight line with second hook elements or initially has a first straight line with second hook elements and subsequently a first straight line with first hook elements, an overall projection 33 which comprises a projection 35 of the first hook elements of the corresponding pair onto the projection plane and a projection 37 of the second hook elements of the corresponding pair onto the projection plane,overlaps onto the projection plane with a projection 39 of the hook elements of the further adhesive tape 1 engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair. Because, for each pair of adjacent first straight lines, the overall projection 33 overlaps onto the projection plane with the projection 39 of the hook elements of the further adhesive tape 1 engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair, a particularly mechanically robust connection between the adhesive tape 1 and the further adhesive tape 1 is ensured.

[0080] In addition, in each adhesive tape 1, each projection section 41 of the overall projection 33, which is defined by a projection 35 of a first hook element 17 of a first straight line with first hook elements of a pair of adjacent first straight lines onto the projection plane and by a projection 37 of a second hook element 19 of a first straight line with second hook elements of the pair of adjacent first straight lines onto the projection plane, overlapping this projection, has a maximum extension 43 as seen along the first extension direction 25, which is greater than a second distance 45 as seen along the first extension direction 25 between two sections seen along the first extension direction 25 with a corresponding minimum extension 47 of two projection sections arranged adjacently along the first extension direction 25.The fact that each projection section 41, as seen along the first direction of extension 25, has the maximum extension 43, which is greater than the second distance 45, as seen along the first direction of extension 25, between two sections seen along the first direction of extension 25 with the corresponding minimum extension 47 of two projection sections arranged adjacently along the first direction of extension 25, ensures that the adhesive tape 1 and the further adhesive tape 1 can be mechanically connected to one another in a particularly robust manner, in particular the adhesive tape 1 and the further adhesive tape 1 can be secured in a particularly simple manner against relative displacement to one another along the second direction of extension 27.

[0081] In addition, for each adhesive tape 1, each projection section 41 of the overall projection 33, which is defined by a projection 35 of a first hook element 17 of a first straight line with first hook elements of a pair of adjacent first straight lines onto the projection plane and by a projection 37 of a second hook element 19 of a first straight line with second hook elements of the pair of adjacent first straight lines onto the projection plane, overlapping this projection, has the minimum extension 47 as seen along the first extension direction 25, which is greater than a third distance 49 as seen along the first extension direction 25 between two sections seen along the first extension direction 25 with a corresponding maximum extension 43 of two projection sections arranged adjacently along the first extension direction 25.The fact that each projection section 41, seen along the first direction of extension 25, has the minimum extension 47, which is greater than the third distance 49, seen along the first direction of extension 25, between the two sections seen along the first direction of extension 25 and the corresponding maximum extension 43 of the two projection sections arranged adjacently along the first direction of extension 25, ensures that the adhesive tape 1 and the further adhesive tape 1 can be mechanically connected to one another in a particularly robust manner, in particular the adhesive tape 1 and the further adhesive tape 1 can be secured in a particularly simple manner against relative displacement to one another along the second direction of extension 27.

[0082] As already described, Fig. 8 a schematic representation of a section of a second embodiment of the adhesive tape system 3 according to the invention. In Fig. 8 the adhesive tape 1 is shown at the top and in the middle is Fig. 8 the additional adhesive tape 1 is shown. In Fig. 8 below shows the adhesive tape system 3, which has the adhesive tape 1 and the further adhesive tape 1 connected to the adhesive tape 1.

[0083] In addition to the adhesive tape 1 according to the invention, a further aspect of the present invention is the already mentioned adhesive tape system 3. Each adhesive tape system 3 has two adhesive tapes connected to one another. Both a first adhesive tape of the two adhesive tapes, which in connection with the present invention can also be referred to as the adhesive tape 1, and a second adhesive tape of the two adhesive tapes, which in connection with the present invention can also be referred to as the further adhesive tape 1, is an adhesive tape 1 according to the invention and already described. The first adhesive tape and the second adhesive tape are connected to one another in such a way that the hook elements of the plurality of hook elements of the first adhesive tape engage with the hook elements of the plurality of hook elements of the second adhesive tape.The features, technical effects and / or advantages already described in connection with the adhesive tape 1 also apply at least analogously to the adhesive tape system 3, so that a corresponding repetition is omitted at this point.

[0084] In addition to the adhesive tape 1 according to the invention and the adhesive tape system 3 according to the invention, a further aspect of the present invention is a method for producing an adhesive tape 1 as already described. The hook unit 9 of the adhesive tape 1 is produced by extrusion. Producing the hook unit 9 by extrusion enables a particularly time-efficient production of the adhesive tape 1. The hook unit 9 of the adhesive tape 1 as already described is therefore extruded.

[0085] The foam layer 5 has already been described. In particular, since the hook unit 9 of the adhesive tape 1 is extruded, the foam layer 5 ensures that, when the foam layer 5 is attached to an object, such as a wall or a picture frame, using the pressure-sensitive adhesive layer 7, the hook unit 9 can be displaced relative to the pressure-sensitive adhesive layer 7 within the third plane and / or rotated about a straight line running perpendicular to the third plane. In particular, compared to an adhesive tape without a foam layer 5, both the pressure-sensitive adhesive layer 7 and the hook unit 9, and in particular also the hook elements of the hook unit 9, are subjected to less mechanical stress during the displacement and / or rotation.In addition, the foam layer 5 ensures that when the foam layer 5 of the adhesive tape 1 is attached to an object, such as a picture frame, using the pressure-sensitive adhesive layer 7 of the adhesive tape 1 and the foam layer 5 of the further adhesive tape 1 is attached to an object, such as a wall, using the pressure-sensitive adhesive layer 11 of the further adhesive tape 1, connecting the adhesive tape 1 to the identically constructed further adhesive tape 1 such that the hook elements of the plurality of hook elements of the adhesive tape 1 engage with the hook elements of the plurality of hook elements of the further adhesive tape 1 is significantly simplified for a user, since the hook units and in particular the hook elements can be aligned more easily relative to one another. The foam layer 5 can also be referred to as a foam carrier.

[0086] The foam layer 5 comprises polyethylene (PE) or is formed from polyethylene. The foam layer 5 comprises a cross-linked polyethylene (cross-linked PE) or is formed from the cross-linked polyethylene. Preferably, the foam layer 5 consists of a cross-linked PE foam.

[0087] The hook unit 9 comprises polyethylene (PE) or is formed from polyethylene (PE). Preferably, the hook unit 9 comprises a polymer blend or is formed from a polymer blend. The polymer blend preferably comprises several polymer components that are in a purely physically mixed state and in which no new chemical bonds are present between the macromolecules of the polymer components. One component of the polymer blend is preferably PE.

[0088] In addition to the adhesive tape 1 according to the invention, the adhesive tape system 3 according to the invention and the method according to the invention, a further aspect of the present invention is the use of an already described adhesive tape 1 for attaching a picture to a wall. For this purpose, the adhesive tape 1 is, for example, first connected to the identically constructed further adhesive tape 1 such that the hook elements of the plurality of hook elements of the adhesive tape 1 engage with the hook elements of the plurality of hook elements of the further adhesive tape 1. Subsequently, the cover layer 13 is removed from the adhesive tape 1 and the adhesive tape 1 is applied with the pressure-sensitive adhesive layer 7 to the back of a picture frame that frames the picture.The cover layer 13 is then removed from the additional adhesive tape 1, and the picture frame is attached to the wall together with the adhesive tape 1 and the additional adhesive tape 1 using the pressure-sensitive adhesive layer 7 of the additional adhesive tape 1. Due to the design of the adhesive tape 1 and the additional adhesive tape 1, or the adhesive tape system 3, the picture can now be removed from the wall again, with the adhesive tape 1 remaining connected to the back of the picture frame and the additional adhesive tape 1 remaining connected to the wall. Using the hook elements, the picture frame can be reattached to the wall at any time. As already described, each first hook element 17 is arranged such that the free end 23 of each first hook element 17 points in the first extension direction 25, and each second hook element 19 is arranged such that the free end 23 of each second hook element 19 points opposite the first extension direction 25.whereby different separation forces can be achieved in the longitudinal direction, namely in the first extension direction 25, and in the transverse direction, namely in the second extension direction 27. Preferably, the adhesive tape 1 is connected to the identically constructed further adhesive tape 1, the adhesive tape 1 is preferably attached to the back of a picture frame enclosing a picture, and the further adhesive tape 1 is preferably attached to the wall in such a way that both the first extension direction 25 of the adhesive tape 1 and the first extension direction 25 of the further adhesive tape 1 run perpendicular to a holding load direction along which the weight of the picture attached to the wall acts, and both the second extension direction 27 of the adhesive tape 1 and the second extension direction 27 of the further adhesive tape 1 run along the holding load direction.whereby particularly strong holding forces can be provided by the adhesive tape system 3 and, at the same time, easy removal of the picture from the wall is ensured for a user, since the user only needs to apply minimal forces when pivoting the picture frame in a direction along the holding load direction. Alternatively, the adhesive tape 1 is preferably connected to the identically constructed additional adhesive tape 1, the adhesive tape 1 is preferably attached to a back of a picture frame enclosing a picture, and the additional adhesive tape 1 is preferably attached to the wall in such a way that both the first extension direction 25 of the adhesive tape 1 and the first extension direction 25 of the additional adhesive tape 1 run along a holding load direction.along which the weight of the picture attached to the wall acts and both the second extension direction 27 of the adhesive tape 1 and the second extension direction 27 of the further adhesive tape 1 run perpendicular to the holding load direction, whereby particularly large holding forces can be provided by the adhesive tape system 3 and at the same time easy removal of the picture from the wall is ensured for a user, since the user only has to apply small forces when pivoting the picture frame in a direction perpendicular to the holding load direction.

[0089] Even if the steps are described in a specific order, the present invention is not limited to this order. Rather, the individual steps can be performed in any meaningful order, in particular at least partially in parallel.

[0090] Additionally, it should be noted that "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. Furthermore, it should be noted that features described with reference to one of the above embodiments can also be used in combination with other features of other embodiments described above. Reference signs in the claims are not to be considered as limitations. List of reference symbols 1 adhesive tape, additional adhesive tape 3 Adhesive tape system 5 foam layer 7 Pressure sensitive adhesive layer 9 Hook unit 11 additional pressure-sensitive adhesive layers 13 Cover layer 15 Hook base layer 17 first hook element 19 second hook element 21 curved section 23 free end 25 first extension direction 27 second extension direction 29 first distance 31 Extension 33 Overall projection 35 Projection of the first hook elements 37 Projection of the second hook elements 39 Projection of the hook elements of the further adhesive tape 41 Projection section 43 Maximum extension 45 second distance 47 Minimum extension 49 third distance QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 4,024,312 A

[0022] DE 33 31 016 C2

[0022] WO 92 / 11333 A1

[0022] DE 42 22 849 A1

[0022] WO 95 / 06691 A1

[0022] DE 195 31 696 A1

[0022] DE 197 08 366 A1

[0022] DE 196 49 727 A1

[0022] DE 196 49 728 A1

[0022] DE 196 49 729 A1

[0022] DE 197 08 364 A1

[0022] DE 197 20 145 A1

[0022] DE 198 20 854 A1

[0022] EP 1 341 862 B1

[0039] Cited Non-Patent Literature

[0000] C. Donker, PSTC Annual Technical Seminar, Proceedings, P. 149-164, May 2001 [0058, 0060]

Claims

[1] Adhesive tape (1), which a foam layer (5) extending along a first plane, a pressure-sensitive adhesive layer (7) arranged on a first side of the foam layer (5) and extending along a second plane arranged parallel to the first plane, and a hook unit (9) arranged on a second side of the foam layer (5) opposite the first side and extending along a third plane arranged parallel to the first plane, wherein the hook unit (9) has a hook base layer (15) extending along the third plane and a plurality of hook elements formed integrally with the hook base layer (15), which hook elements have a plurality of first hook elements and a plurality of second hook elements, wherein each hook element of the plurality of hook elements extends on a side of the hook unit (9) facing away from the pressure-sensitive adhesive layer (7) from the hook base layer (15) along a curved section (21) towards a free end (23), wherein each first hook element (17) is arranged such that the free end (23) of each first hook element (17) points in a first extension direction (25) running along the third plane, wherein each second hook element (19) is arranged such that the free end (23) of each second hook element (19) points opposite to the first extension direction (25), wherein the hook elements of the plurality of hook elements are arranged such that along each first straight line of a plurality of first straight lines running parallel to one another and along the first direction of extension (25), either first hook elements or second hook elements are arranged one behind the other, wherein the hook elements are spaced apart from each other by a first distance (29) from adjacent first straight lines in a second extension direction (27) running along the third plane and perpendicular to the first extension direction (25), which is less than an extension (31) of each hook element in the second extension direction (27), and wherein, viewed along the second extension direction (27), a first pair of adjacent first straight lines initially comprises a first straight line with first hook elements and subsequently a first straight line with second hook elements, and a second pair of adjacent first straight lines initially comprises a first straight line with second hook elements and subsequently a first straight line with first hook elements, wherein the hook elements of the plurality of hook elements are shaped and arranged such that, when the adhesive tape (1) is connected to an identically constructed further adhesive tape (1) such that the hook elements of the plurality of hook elements of the adhesive tape (1) engage with the hook elements of the plurality of hook elements of the further adhesive tape (1), both for the first pair of adjacent first straight lines and for the second pair of adjacent first straight lines, an overall projection (33),which has a projection (35) of the first hook elements of the corresponding pair onto a projection plane running perpendicular to the second extension direction (27) and a projection (37) of the second hook elements of the corresponding pair onto the projection plane, which projection plane overlaps with a projection (39) of the hook elements of the further adhesive tape (1) engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair onto the projection plane. [2] Adhesive tape (1) according to the preceding claim, wherein the foam layer (5) comprises polyethylene (PE) or is formed from polyethylene (PE). [3] Adhesive tape (1) according to one of the preceding claims, wherein the pressure-sensitive adhesive layer (7) comprises a thermoplastic elastomer or is formed from a thermoplastic elastomer. [4] Adhesive tape (1) according to one of the preceding claims, wherein the hook unit comprises polyethylene (PE) or is formed from polyethylene (PE). [5] Adhesive tape (1) according to one of the preceding claims, wherein, viewed along the second direction of extension (27), each pair of adjacent first straight lines either initially comprises a first straight line with first hook elements and subsequently a first straight line with second hook elements, or initially comprises a first straight line with second hook elements and subsequently a first straight line with first hook elements. [6] Adhesive tape (1) according to one of the preceding claims, wherein the hook elements of the plurality of hook elements are shaped and arranged such that, when the adhesive tape (1) is connected to an identically constructed further adhesive tape (1) such that the hook elements of the plurality of hook elements of the adhesive tape (1) engage with the hook elements of the plurality of hook elements of the further adhesive tape (1), for each pair of adjacent first straight lines which, viewed along the second extension direction (27), either initially has a first straight line with first hook elements and subsequently a first straight line with second hook elements or initially has a first straight line with second hook elements and subsequently a first straight line with first hook elements, an overall projection (33),which has a projection (35) of the first hook elements of the corresponding pair onto the projection plane and a projection (37) of the second hook elements of the corresponding pair onto the projection plane, which overlaps a projection (39) of the hook elements of the further adhesive tape (1) engaging with the first hook elements of the corresponding pair or with the second hook elements of the corresponding pair onto the projection plane. [7] Adhesive tape (1) according to one of the preceding claims, wherein each projection section (41) of the overall projection (33), which is defined by a projection (35) of a first hook element (17) of a first straight line with first hook elements of a pair of adjacent first straight lines onto the projection plane and by a projection (37) of a second hook element (19) of a first straight line with second hook elements of the pair of adjacent first straight lines onto the projection plane, overlapping this projection, has a maximum extension (43) as seen along the first extension direction (25) that is greater than a second distance (45) as seen along the first extension direction (25) between two sections as seen along the first extension direction (25) with a corresponding minimum extension (47) of two projection sections arranged adjacently along the first extension direction (25). [8] Adhesive tape (1) according to one of the preceding claims, wherein each projection section (41) of the overall projection (33), which is defined by a projection (35) of a first hook element (17) of a first straight line with first hook elements of a pair of adjacent first straight lines onto the projection plane and by a projection (37) of a second hook element (19) of a first straight line with second hook elements of the pair of adjacent first straight lines onto the projection plane, overlapping this projection, has a minimum extension (47) as seen along the first extension direction (25) which is greater than a third distance (49) as seen along the first extension direction (25) between two sections as seen along the first extension direction (25) with a corresponding maximum extension (43) of two projection sections arranged adjacently along the first extension direction (25). [9] Adhesive tape system (3) with two adhesive tapes connected to one another, wherein both a first adhesive tape of the two adhesive tapes and a second adhesive tape of the two adhesive tapes are an adhesive tape (1) according to one of the preceding claims and the first adhesive tape and the second adhesive tape are connected to one another such that the hook elements of the plurality of hook elements of the first adhesive tape engage with the hook elements of the plurality of hook elements of the second adhesive tape. [10] Method for producing an adhesive tape (1) according to one of the preceding claims, wherein the hook unit (9) of the adhesive tape (1) is produced by extrusion. [11] Use of an adhesive tape (1) according to one of claims 1 to 8 for attaching a picture to a wall.

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