Adhesive tape and method for sheathing elongated goods, in particular cables and cable harnesses

Abstract

Adhesive tape for wrapping elongated goods such as in particular cables or cable harnesses, comprising a band-shaped carrier 31 provided with a curable adhesive 32 and on the curable adhesive 32, specifically on the surface of the curable adhesive 32 opposite the carrier 31, a layer of a pressure-sensitive adhesive 34 is applied, wherein a barrier layer is present between the curable adhesive 32 and the layer of pressure-sensitive adhesive 34, wherein the curable adhesive 32 is a thermally curable, meltable adhesive comprising an epoxy-functionalized acrylonitrile / butadiene copolymer having an average of more than 1.5 epoxy groups per molecule and the milled reaction product of phthalic anhydride and diethylenetriamine or as curable adhesive 32 a UV-curable composition is used, comprising, based on the total weight of the composition: • 15 to 50 parts by weight of matrix polymer; • 50 to 85 parts by weight of epoxy resin; • 0.1 to 3 parts by weight of photoinitiator, wherein the matrix polymer forms a monolayer self-supporting film in which epoxy resin and photoinitiator are embedded.

Description

[0001] The invention relates to an adhesive tape for sheathing elongated goods, in particular cables or cable harnesses, comprising a band-shaped carrier which is provided on at least one side with a curable adhesive, and to a method for sheathing elongated goods, in particular cable harnesses.

[0002] Adhesive tapes have been used in industry for some time to manufacture cable harnesses. These tapes are used to bundle a large number of electrical cables prior to installation or after assembly. For example, they can reduce the space required by the cable bundle by bandaging and provide additional protective functions such as protection against mechanical and / or thermal stress. Common forms of adhesive tapes include film or textile backings, which are usually coated on one side with pressure-sensitive adhesives. Adhesive tapes for wrapping elongated goods are known, for example, from DE 10 2013 213 726 A1, EP 1 848 006 A2, and EP 2 497 805 A1.

[0003] Current cable harnesses wrapped with adhesive tape are generally flexible. However, this is often undesirable for manufacturing reasons. In production, the cable harnesses are usually prefabricated into a cable plan and then inserted into the object to be assembled, such as an automobile. A cable harness plan corresponds to the actual spatial arrangement of the individual cable harnesses in the cable harness. It shows which cable harness is bent at which point and at what angle, the locations of branches or terminations, and the connectors used at the ends of the cable harnesses.

[0004] To keep the individual strands of the cable harness in a specific shape so that they can be routed around the engine in the engine compartment, for example, without coming into contact with the engine, injection-molded parts are usually subsequently attached to the adhesive-wrapped wiring harness. However, these injection-molded parts have the disadvantage of requiring additional material and assembly costs.

[0005] The publications DE 10 2019 211 178 A1, DE 10 2019 210 708 A1 or DE 10 2019 206 929 A1 each disclose a method for sheathing elongated goods, such as in particular cables or cable harnesses, in which the elongated goods are wrapped with an adhesive tape with a curable adhesive applied thereto in a helical line or in an axial direction and the adhesive applied to the adhesive tape is activated and cured.

[0006] A disadvantage of these adhesive tapes is that they only contain a curable adhesive as the mandatory adhesive component. Curable adhesives sometimes lack sufficient tack and adhesion to the material to be wrapped, making positioning and processing of the tape difficult. Furthermore, curable adhesives often lose their (instant) adhesive strength upon activation, so that the positioning can be lost after curing. Vibration further complicates positioning, preventing adequate shaping and adequate protection of the wiring harness.

[0007] These problems also arise when using an adhesive tape that uses a curable pressure-sensitive adhesive as the adhesive, as disclosed in DE 10 2019 103 120 A1. Furthermore, such adhesives, and thus the corresponding adhesive tapes, are very expensive.

[0008] Therefore, adhesive tapes are desirable that enable positioning and simplified processing by still providing sufficiently high adhesive strength to the substrate after activation.

[0009] DE 43 34 039 A1 relates to an adhesive tape consisting of a flexible, tape-like carrier and a coating having self-adhesive properties. A heat-curable material component is added to the carrier and / or the coating in such a way that the adhesive tape exhibits dimensionally stable properties after curing. This adhesive tape is therefore particularly suitable for wrapping initially flexible cable sets, such as cable harnesses and the like, which can then be made dimensionally stable by heating.

[0010] DE 20 2004 019 761 U1 discloses a technical adhesive tape, in particular a self-winding, waterproof cable wrapping tape and / or a cable wrapping tape for providing abrasion protection. The adhesive tape comprises a tape-shaped textile carrier with a pressure-sensitive adhesive layer and a plastic coating applied to at least one side of the carrier, wherein the plastic coating applied to the carrier is a polyurethane compound.

[0011] US 2013 / 0 043 058 A1 discloses an adhesive film comprising an insulating film and an adhesive layer formed on the insulating film, which contains a copolyamide resin which is soluble in a solvent at room temperature (25°C) and has a melting point of not less than 100°C and not more than 150°C, and a halogen-free flame retardant,

[0012] EP 3 499 664 A1 discloses a method for producing a rigid cable harness. For this purpose, a curable sheath is described, which comprises a curable compound, an adhesive, and a carrier.

[0013] DE 37 89 072 T2 describes a process in which a film-shaped substrate comprising PVC and a plasticizer is coated on one side with an acrylic pressure-sensitive adhesive and on the other side with a liquid curable foamable material. The substrate is then heated to a temperature of at least 140 °C, which causes the curable material to foam and solidify.

[0014] The object of the present invention is therefore to provide an adhesive tape for wrapping elongated material that eliminates the disadvantages described above and meets the requirements described above. The object of the present invention is also to provide a method for wrapping elongated material and a product obtainable by the method.

[0015] This object is achieved by an adhesive tape as described in the independent claim. The dependent claims relate to advantageous developments of the subject matter of the invention. Furthermore, the invention encompasses a method for wrapping elongated items with the adhesive tape, as well as a product obtainable by the method.

[0016] Accordingly, the invention relates to an adhesive tape of the type mentioned at the outset, as defined in claim 1. Preferably, the curable adhesive is applied only to one side of the carrier. The pressure-sensitive adhesive is applied to the side of the curable adhesive, but can also be applied to the other side of the tape-shaped carrier of the adhesive tape.

[0017] In one variant of the invention, a layer of a curable adhesive is present on both sides of the carrier. One or two layers of a pressure-sensitive adhesive are present on at least one exposed side of the layers of the curable adhesive or on both exposed sides of the layers of the curable adhesive.

[0018] Because the pressure-sensitive adhesive exhibits good tack and adhesion to the material being wrapped, even after the curable adhesive of the tape has been activated, positioning and processing the tape is made considerably easier. For example, the positioning of the tape can be corrected if it was not done correctly immediately. Furthermore, the positioning is maintained and cannot slip if the curable adhesive loses its (instant) adhesive strength after activation. This means that even any vibration does not disrupt the positioning. Adequate shaping and good protection of the wiring harness are ensured.

[0019] The adhesive tape is coated with a curable adhesive on one side of the tape-like backing, and a layer of pressure-sensitive adhesive is applied to the curable adhesive, specifically on the surface opposite the backing. This ensures that the pressure-sensitive adhesive is in direct contact with the material being wrapped when applied and is particularly effective at ensuring a lasting adhesive bond even after the curable adhesive has cured. This reliably prevents the adhesive tape from slipping on the material being wrapped.

[0020] If the curable adhesive is not applied over the entire surface, it is also possible that the layer of the pressure-sensitive adhesive is applied directly to the carrier and the partially applied curable adhesive is present on the pressure-sensitive adhesive.

[0021] Furthermore, an embodiment of the invention is possible in which the curable adhesive and the pressure-sensitive adhesive are partially applied to the same side of the carrier, in particular such that the two adhesive layers do not overlap at any point on the carrier. This means that the pressure-sensitive adhesive is coated in the areas on the carrier not coated with the curable adhesive, and vice versa. Preferably, the surface of the carrier is 100% coated with the adhesive.

[0022] A common problem with the use of reactive, curable components is that they exhibit sensitizing properties. If the pressure-sensitive adhesive is applied directly to the curable adhesive as a barrier layer, the user can be protected from any reactions that may occur upon contact with the curable adhesive. Barrier layers, such as films made of PET, PP, or PE, can further improve the barrier effect against migrating components. The effects of the barrier layers are further improved by metallization or one (or more) metal layer(s). The metals that can be chosen for the metal foil are silver, copper, gold, platinum, aluminum and aluminum compounds, tin, nichrome, NIROSTA, titanium, metal oxides such as tin oxides, zinc oxides, magnesium oxides, and preferably aluminum.This list is not to be considered exhaustive, but the person skilled in the art can choose further metal layers not explicitly mentioned here without departing from the spirit of the invention. The following metallic layers are examples: - Aluminium foil, especially with a thickness of 15 to 100 µm - Copper foil, in particular with a thickness of 10 to 80 µm - Stainless steel foil, especially with a thickness of 10 to 60 µm - Layered laminates made of a plastic film with a thickness between 20 and 50 µm, in particular 36 µm, and a metallic surface with a thickness between 15 and 25 µm, in particular 20 µm - Layered laminates made of a paper and metallic surface

[0023] Furthermore, papers, nonwovens, fabrics and other web-like carrier materials can have a sufficiently high barrier effect to be used as a barrier layer.

[0024] In a particularly preferred embodiment, a layer of pressure-sensitive adhesive is also applied to the side of the tape-shaped carrier facing away from the curable adhesive. This enables a particularly good bond between the adhesive tape and the material to be wrapped, which particularly reliably prevents the adhesive tape from slipping even after the curable adhesive has cured.

[0025] If a pressure-sensitive adhesive is applied to both sides of the carrier, it can be the same pressure-sensitive adhesive or different pressure-sensitive adhesives. Furthermore, the term "one pressure-sensitive adhesive" should be understood to mean at least one pressure-sensitive adhesive. Typically, one pressure-sensitive adhesive is applied on each side. However, it is also possible for several different pressure-sensitive adhesives to be used on one side, for example, if different additional properties are required and need to be covered.

[0026] According to one embodiment of the invention, the elongated item is a cable harness comprising a bundle of several cables, such as 3 to 1000 cables, preferably 10 to 500 cables, in particular between 50 and 300 cables.

[0027] The pressure-sensitive adhesive is preferably a pressure-sensitive adhesive, i.e., an adhesive that allows for permanent bonding with almost all substrates even under relatively light pressure and can be removed from the substrate after use, leaving essentially no residue. A pressure-sensitive adhesive is permanently tacky at room temperature, i.e., it has a sufficiently low viscosity and high tackiness to wet the surface of the respective substrate even under light pressure. The bondability of the adhesive is based on its adhesive properties, and its removability on its cohesive properties.

[0028] Preferred are pressure-sensitive adhesives as described in the published European patent applications EP 2 520 627 A1, EP 2 522 705 A1, EP 2 520 628 A1, EP 2 695 926 A1, EP 2 520 629 A1 and EP 3 433 330 A1, which are incorporated herein by reference.

[0029] According to a first embodiment, the pressure-sensitive adhesive is in the form of a dried polymer dispersion, wherein the polymer is composed of: • 5 to 25 wt.%, preferably 10 to 22 wt.% ethylene, • 30 to 69 wt.%, preferably 40 to 60 wt.% alkyl acrylic esters with C4 to C 12 -alkyl radicals, • 20 to 55 wt.%, preferably 28 to 38 wt.% vinyl acetate, • 0 to 10 wt. % of other ethylenically unsaturated compounds, wherein the pressure-sensitive adhesive contains between 15 and 100 parts by weight of a tackifier (based on the mass of the dried polymer dispersion), as described in EP 2 520 627 A1. The alkyl acrylate ester is preferably n-butyl acrylate and / or 2-ethylhexyl acrylate. Other ethylenically unsaturated compounds include alkyl (meth)acrylates, preferably C1 to C 20 -Alkyl (meth)acrylates with the exception of the alkyl acrylic esters with C4 to C 12 -alkyl radical-forming monomers, aromatic vinyl monomers such as styrene, α-methylstyrene and vinyltoluene, C1- to C 10-Hydroxyalkyl (meth)acrylates such as, in particular, hydroxyethyl or hydroxypropyl (meth)acrylate, vinyl esters of carboxylic acids containing up to 20 carbon atoms, such as vinyl laurate, vinyl ethers of alcohols containing up to 10 carbon atoms, such as vinyl methyl ether or vinyl isobutyl ether, vinyl halides such as vinyl chloride or vinylidene dichloride, acid amides such as acrylamide or methacrylamide, and unsaturated hydrocarbons having 3 to 8 carbon atoms, such as propene, butadiene, isoprene, 1-hexene, or 1-octene, or mixtures thereof. Furthermore, a di- or polyfunctional monomer can advantageously be added to the polymer as a monomer, preferably in an amount of 0 to 2% by weight and particularly preferably in an amount of 0 to 1% by weight.Examples of polyfunctional ethylenically unsaturated monomers (e) are divinylbenzene, alkyl diacrylates such as 1,2-ethylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,8-octanediol diacrylate, or 1,12-dodecanediol diacrylate, triacrylates such as trimethylolpropane triacrylate, and tetraacrylates such as pentaerythritol tetraacrylate. The polymer dispersion is prepared by emulsion polymerization of the aforementioned components. Particularly preferred embodiments and detailed descriptions of the starting materials and preparation processes can be found in EP 0 017 986 B1 and EP 0 185 356 B1.

[0030] According to a further embodiment, the pressure-sensitive adhesive is in the form of a dried polymer dispersion, wherein the polymer is composed of: (a) 90 to 99 wt.% n-butyl acrylate and / or 2-ethylhexyl acrylate, preferably 2-ethylhexyl acrylate, (b) 0 to 10 wt.% of an ethylenically unsaturated monomer having an acid or acid anhydride function, (c) 10 to 1 wt.% of one or more ethylenically unsaturated monofunctional monomers other than (a) and (b), such as acrylonitrile and / or methacrylonitrile, (d) 0 to 1 wt. % of a di- or polyfunctional monomer, wherein the pressure-sensitive adhesive contains between 15 and 100 parts by weight of a tackifier (based on the mass of the dried polymer dispersion), as described in EP 2 522 705 A1. A particularly preferred embodiment of the invention thus comprises a mixture of 2-ethylhexyl acrylate as monomer (a) and acrylonitrile as monomer (c). Advantageously suitable monomers (b) include, for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, and / or maleic anhydride. Preference is given to acrylic acid or methacrylic acid, or optionally a mixture of both. Examples of polyfunctional ethylenically unsaturated monomers (d) are divinylbenzene, alkyl diacrylates such as 1,2-ethylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,8-octanediol diacrylate or 1,12-dodecanediol diacrylate, triacrylates such as trimethylolpropane triacrylate and tetraacrylates such as pentaerythritol tetraacrylate.The polymer dispersion is prepared by the emulsion polymerization process of the aforementioned components. Descriptions of this process are given, for example, in EP 1 378 527 B1.

[0031] According to a further embodiment, the pressure-sensitive adhesive is in the form of a dried polymer dispersion, wherein the polymer is composed of: (a) 40 to 90 wt.% n-butyl acrylate and / or 2-ethylhexyl acrylate, preferably 2-ethylhexyl acrylate (b) 2-ethylhexyl acrylate, 0 to 10 wt.% of an ethylenically unsaturated monomer having an acid or acid anhydride function, (c) 60 to 10 wt.% of one or more ethylenically unsaturated monofunctional monomers other than (a) and (b), (d) 0 to 1 wt. % of a di- or polyfunctional monomer, wherein the pressure-sensitive adhesive contains between 15 and 100 parts by weight of a tackifier (based on the mass of the dried polymer dispersion), as described in EP 2 520 628 A1. Advantageous monomers (b) include, for example, acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, and / or maleic anhydride. Preference is given to acrylic acid or methacrylic acid, or optionally a mixture of both.

[0032] Monomers (c) include alkyl (meth)acrylates, preferably C1 to C 20 -Alkyl (meth)acrylates with the exception of the (a) forming monomers, aromatic vinyl monomers such as styrene, α-methylstyrene and vinyltoluene, C1- to C 40Hydroxyalkyl (meth)acrylates such as, in particular, hydroxyethyl or hydroxypropyl (meth)acrylate, vinyl esters of carboxylic acids containing up to 20 carbon atoms, such as vinyl acetate or vinyl laurate, vinyl ethers of alcohols containing up to 10 carbon atoms, such as vinyl methyl ether or vinyl isobutyl ether, vinyl halides such as vinyl chloride or vinylidene dichloride, acid amides such as acrylamide or methacrylamide, and unsaturated hydrocarbons having 2 to 8 carbon atoms, such as ethylene, propene, butadiene, isoprene, 1-hexene, or 1-octene. Ethyl acrylate is particularly preferred according to the invention. Examples of polyfunctional ethylenically unsaturated monomers (d) are divinylbenzene, alkyl diacrylates such as 1,2-ethylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,8-octanediol diacrylate or 1,12-dodecanediol diacrylate, triacrylates such as trimethylolpropane triacrylate and tetraacrylates such as pentaerythritol tetraacrylate.The polymer dispersion is produced by the emulsion polymerization process of the aforementioned components. Examples of this process are described, for example, in EP 1 378 527 B1.

[0033] According to a further embodiment, the pressure-sensitive adhesive is in the form of a dried and electron beam (EBC) crosslinked polymeric acrylate dispersion, in particular an aqueous acrylate dispersion, preferably with a gel value of greater than or equal to 40%, determined by Soxhlet extraction, wherein the polymeric acrylate dispersion comprises polymers which are composed of (a) monomeric acrylates and optionally (b) ethylenically unsaturated comonomers other than acrylates,wherein the pressure-sensitive adhesive contains between 15 and 100 parts by weight of a tackifier (based on the mass of the dried polymeric dispersion) as described in EP 2 695 926 A1.

[0034] According to a further embodiment, the pressure-sensitive adhesive has a shear viscosity at a temperature of 25 °C during coating from dispersion of 200 to 100,000 Pa*s at a shear rate of 10 -2 s -1 and from 0.1 to 10 Pa*s at a shear rate of 100 s -1 The pressure-sensitive adhesive preferably consists of an aqueous acrylate dispersion, i.e., a polyacrylic acid ester finely dispersed in water with pressure-sensitive adhesive properties, as described, for example, in the Handbook of Pressure Sensitive Technology by D. Satas. Acrylic pressure-sensitive adhesives are typically radically polymerized copolymers of alkyl acrylic acid esters or alkyl methacrylic acid esters of C1 to C 20-Alcohols such as methyl acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, iso-octyl (meth) acrylate, n-decyl (meth) acrylate, n-Dodecyl (meth) acrylate, tetradecyl (meth) acrylate, lauryl (meth) acrylate, oleyl (meth) acrylate, palmityl (meth) acrylate and stearyl (meth) acrylate in addition to other (meth) acrylic acid esters such as isobornyl (meth) acrylate, benzyl (meth) acrylate, phenyl (meth) acrylate and 2-bromoethyl (meth) acrylate, Alkoxy alkyl (meth) acrylates such as ethoxyethyl (meth) acrylate. This also includes esters of ethylenically unsaturated di- and tricarboxylic acids and anhydrides such as ethyl maleate, dimethyl fumarate, and ethyl methyl itaconate. Vinyl aromatic monomers such as styrene, vinyltoluene, methylstyrene, n-butylstyrene, and decylstyrene are also included, as described in EP 2 520 629 A1.

[0035] According to a further embodiment, the pressure-sensitive adhesive is in the form of a dried polymer dispersion, wherein the polymer is composed of: (a) 95.0 to 100.0 wt.% n-butyl acrylate and / or 2-ethylhexyl acrylate and (b) 0.0 to 5.0 wt.% of an ethylenically unsaturated monomer having an acid or acid anhydride function as described in EP 2 433 330 A1.

[0036] The polymer preferably consists of 95.0 to 99.5 wt.% n-butyl acrylate and / or 2-ethylhexyl acrylate and 0.5 to 5 wt.% of an ethylenically unsaturated monomer having an acid or acid anhydride function, more preferably of 98.0 to 99.0 wt.% n-butyl acrylate and / or 2-ethylhexyl acrylate and 1.0 to 2.0 wt.% of an ethylenically unsaturated monomer having an acid or acid anhydride function. In addition to the acrylate polymers listed, tackifiers and / or additives such as light stabilizers or age inhibitors can be added to the pressure-sensitive adhesive in addition to any residual monomers present. In particular, no other polymers such as elastomers are present in the pressure-sensitive adhesive; this means that the polymers of the pressure-sensitive adhesive consist only of the monomers (a) and (b) in the stated proportions.

[0037] According to a further embodiment, the pressure-sensitive adhesive is in the form of a dried polymer dispersion, wherein the polymer is composed of: (a) 97.0 to 98.0 wt.% n-butyl acrylate and / or 2-ethylhexyl acrylate, (b) 2.0 to 3.0 wt.% of an ethylenically unsaturated monomer having an acid or acid anhydride function.

[0038] The polymer preferably consists of 97.2 to 97.7 wt.% n-butyl acrylate and / or 2-ethylhexyl acrylate, preferably n-butyl acrylate, and 2.3 to 2.8 wt.% of an ethylenically unsaturated monomer with an acid or acid anhydride function. Examples of advantageous monomers (b) include acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, and / or maleic anhydride.

[0039] According to a further embodiment, the pressure-sensitive adhesives are crosslinker-free. "Crosslinker-free" in the context of this invention means that no compounds capable of crosslinking are added to the pressure-sensitive adhesive. As used here, the term crosslinker refers to chemical compounds capable of linking molecular chains together so that three-dimensionally crosslinked structures can be formed from the two-dimensional structures via the formation of intermolecular bridges. Crosslinkers are those compounds—in particular bi- or polyfunctional, usually low-molecular-weight compounds—that can react with suitable—in particular functional—groups of the polymers to be crosslinked under the selected crosslinking conditions, thus linking two or more polymers or polymer sites to one another (“forming bridges”) and thus creating a network of the polymer(s) to be crosslinked.This usually results in increased cohesion. Typical examples of crosslinkers are chemical compounds that contain two or more identical or different functional groups within the molecule or at both ends of the molecule and can therefore crosslink molecules of identical or different structures. Furthermore, a crosslinker can react with the reactive monomer or reactive resin, as defined above, without resulting in polymerization in the true sense of the word. Unlike the activator, as described above, a crosslinker can be incorporated into the polymer network.

[0040] It is further particularly preferred that the pressure-sensitive adhesive is not curable, i.e. the adhesive tape consists of at least two adhesive layers with different properties, on the one hand a pressure-sensitive adhesive layer, and on the other hand a curable adhesive layer.

[0041] With regard to the curable adhesive, it is particularly preferred that it can be activated by means of radiation energy, heat energy, moisture or pressure.

[0042] According to one embodiment, a structural adhesive (construction adhesive, assembly adhesive) is used as the curable adhesive (see Römpp, Georg Thieme Verlag, document identifier RD-19-04489, last updated: September 2012). According to DIN EN 923: 2006-01, structural adhesives are adhesives that form adhesive bonds that can maintain a specified strength in a structure for a specified, extended period of time (according to the ASTM definition: "bonding agents used for transferring required loads between adherends exposed to service environments typical for the structure involved"). They are therefore adhesives for bonds subject to high chemical and physical stresses, which, when cured, contribute to the strengthening of the bonded substrates and are used to manufacture structures made of metals, ceramics, concrete, wood, or reinforced plastics.The structural adhesives according to the invention are based in particular on reactive adhesives (phenolic resins, epoxy resins, polyimides, polyurethanes and others).

[0043] The curable adhesive can be elastic after curing to ensure a durable sheath that is resistant to vibration and torsion.

[0044] A UV-curable composition is used as the curable adhesive, comprising, based on the total weight of the composition: • 15 to 50 parts by weight of matrix polymer; • 50 to 85 parts by weight of epoxy resin; • 0.1 to 3 parts by weight of photoinitiator, whereby the matrix polymer forms a self-supporting film in which epoxy resin and photoinitiator are embedded, whereby the following variants can be used as the adhesive layer: a) only the UV-curable composition as a monolayer b) a mixture of the UV-curable composition and a self-adhesive pressure-sensitive adhesive c) a multi-layer structure of UV-curable composition and self-adhesive adhesive

[0045] Preferably, the matrix polymer is selected from the group consisting of styrene copolymers, acrylate copolymers, methacrylate copolymers, thermoplastic polyurethanes, copolyesters, copolyamides and ethylene-vinyl acetate copolymers and mixtures thereof.

[0046] A single epoxy resin or a mixture of epoxy resins can be used as the epoxy resin(s) in the UV-curable composition. In principle, epoxy resins that are liquid at room temperature or solid at room temperature, or mixtures thereof, can be used.

[0047] Examples, without wishing to be limited, are 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexanecarboxylate (EEC) and derivatives, dicyclopendadiene dioxide and derivatives, 3-ethyl-3-oxetanemethanol and derivatives, tetrahydrophthalic acid diglycidyl ester and derivatives, hexahydrophthalic acid diglycidyl ester and derivatives, 1,2-ethanediglycidyl ether and derivatives, 1,3-propanediglycidyl ether and derivatives, 1,4-butanediol diglycidyl ether and derivatives, higher 1,n-alkanediglycidyl ethers and derivatives, bis-[(3,4-epoxycyclohexyl)methyl]adipate and derivatives, vinylcyclohexyl dioxide and derivatives, 1,4-cyclohexanedimethanol bis-(3,4-epoxycyclohexanecarboxylate) and Derivatives, 4,5-epoxytetrahydrophthalic acid diglycidyl ester and derivatives, bis-[1-ethyl(3-oxetanyl)methyl] ether and derivatives, pentaerythritol tetraglycidyl ether and derivatives, bisphenol A diglycidyl ether (DGEBA), hydrogenated bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, hydrogenated bisphenol F diglycidyl ether, epoxyphenol novolaks, hydrogenated epoxyphenol novolak,Epoxycresol novolaks, hydrogenated epoxycresol novolaks, 2-(7-oxabicyclo; spiro[1,3-dioxane-5,3'-[7]oxabicyclo[4.1.0]-heptane], 1,4-bis((2,3-epoxypropoxy)-methyl)cyclohexane.,

[0048] Reactive resins can be used in their monomeric or dimeric, trimeric, etc. up to their oligomeric form.

[0049] Preferably, the epoxy resin or at least one of the epoxy resins is a solid; in particular one having a softening temperature of at least 45 °C or one having a viscosity at 25 °C of at least 20 Pa*s, preferably at least 50 Pa*s, in particular at least 150 Pa*s (determined according to DIN 53019-1-2008-09 at 25 °C and a shear rate of 1 s -1 ).

[0050] Furthermore, an epoxy-functionalized acrylonitrile / butadiene copolymer with an average of more than 1.5 epoxy groups per molecule can be used as the curable adhesive. In this document, a copolymer of acrylonitrile and butadiene is used, to which the corresponding number of epoxy groups are chemically attached. Preferably, two epoxy groups are chemically attached per molecule. The chemical linkage is generally carried out by starting from a carboxyl-functionalized, usually carboxyl-terminated copolymer of acrylonitrile and butadiene (CAS number: 68891-46-3), which is reacted either with a diepoxide, for example with bisphenol A diglycidyl ether (DGEBA) or with bisphenol F diglycidyl ether (DGEBF) or with a bisphenol A epichlorohydrin resin with an average molecular weight ≤700 g / mol (CAS number: 25068-38-6) or with a bisphenol F epichlorohydrin resin (CAS number: 9003-36-5) or with epichlorohydrin.Carboxyl-terminated copolymers of acrylonitrile and butadiene are commercially available under the trade name Hypro® and the suffix CTBN from CVC / Emerald Performance Materials. The epoxy-functionalized acrylonitrile / butadiene copolymers produced from them are also available from the same company under the trade name Hypro® and have the suffix ETBN. They are also available from Schill+Seilacher under the trade name Struktol®-Polydis. The particularly advantageous grades chain-extended with bisphenol A and bisphenol F are also available under the same trade name, as are the equally usable, epoxy-functionalized, pre-crosslinked nitrile rubbers.

[0051] The reaction product of phthalic anhydride and diethylenetriamine has the CAS number 68003-28-1. It is available in ground form under the trade name ARADUR® 9506 from Huntsman. The free diethylenetriamine content is advantageous and, according to the ARADUR® 9506 specification, between 1.0 and 5.0 weight percent. The grain size is advantageous and, according to the ARADUR® 9506 specification, at least 95 weight percent in diameter is less than or equal to 70 µm.

[0052] The epoxy-functionalized acrylonitrile / butadiene copolymer with an average of more than 1.5 epoxy groups per molecule and the ground reaction product of phthalic anhydride and diethylenetriamine are advantageously present in a defined ratio in the adhesive according to the invention. This defined ratio is selected such that the number of NH bonds of the ground reaction product of phthalic anhydride and diethylenetriamine to the total number of epoxy groups is between 0.1 and 1.5, preferably between 0.3 and 1.2, and particularly preferably between 0.5 and 0.9. To calculate these ratios, a theoretical equivalent weight of 77.7 g per mole of NH bonds is assumed for the reaction product of phthalic anhydride and diethylenetriamine.

[0053] Advantageously, the total thickness of the applied adhesive (curable adhesive or pressure-sensitive adhesive) is between 20 µm and 500 µm, further advantageously between 30 µm and 250 µm, particularly advantageously between 40 µm and 100 µm.

[0054] Both adhesives, the curable adhesive and the pressure-sensitive adhesive, are preferably applied over the entire surface or partially to the carrier or the other adhesive. The coating can also be in the form of one or more stripes in the longitudinal (machine) direction, optionally in the transverse direction, but it is preferably applied over the entire surface. Furthermore, the adhesives can be applied in a grid pattern using screen printing, where the adhesive dots can also be of different sizes and / or distributed differently, by gravure printing in continuous webs in the longitudinal and transverse directions, by halftone printing, or by flexographic printing. The adhesive can be in the form of a dome (produced by screen printing) or in another pattern such as a grid, stripes, or zigzag lines. Furthermore, it can also be sprayed on, for example, which results in a more or less irregular application pattern. The amount of adhesive applied must always be selected so that the respective requirements placed on the adhesive are met.

[0055] All known films and textile backings such as knitted fabrics, scrims, ribbons, braids, needle-punched textiles, felts, woven fabrics (including plain weave, twill, and satin weave), warp-knitted fabrics (including warp-knitted and knitted fabrics), or nonwovens can be used as backings. "Nonwoven" refers to at least textile fabrics according to EN 29092 (1988), as well as stitch-bonded nonwovens and similar systems. Adhesive tapes using a woven fabric, nonwoven, or knitted fabric as the backing are particularly advantageous. Such backings are described, for example, in WO 2015 / 004190 A1, which is incorporated herein by reference.

[0056] Stitch-bonded fabrics also include thread layer stitch-bonded fabrics, i.e. textile fabrics with one or more superimposed thread layers as the base material, which are consolidated by the stitch formation of integrated knitted threads, for example Florofol, pile thread stitch-bonded fabrics, i.e. textile fabrics in which knitted threads are formed as a pile and incorporated into a base material by means of stitch formation, for example Malipol and weft pile stitch-bonded fabrics, i.e. textile fabrics in which unmeshed threads formed as a pile are bound to a base material by means of knitted threads by means of stitch formation, for example weft pile.

[0057] Also preferred are nonwoven fabrics, i.e. textile sheet structures produced without the use of threads by forming fiber meshes from a pre-prepared fiber web. These include fiber-nonwoven fabrics, i.e. textile sheet structures made of fiber web with a strengthening fiber mesh side and a side with fibers arranged horizontally to the fiber mesh layer, wherein fibers from the fiber web are formed into fiber meshes, for example Malivlies; pile fiber nonwoven fabrics, i.e. textile sheet structures made of fiber web with or without the use of a base material, which consist of a fiber mesh side and a pile fiber side with fibers arranged almost perpendicular to the fiber mesh layer, for example Voltex, Kunit or Maliknit; mesh nonwoven fabrics, i.e. textile sheet structures made of a pile fiber nonwoven fabric, from whose pile fibers a second fiber mesh layer is formed, for example Multiknit or Optiknit.

[0058] The above definitions are taken from DIN 61211:2005-05.

[0059] Furthermore, woven and knitted spacer fabrics with a backing can be used. Such spacer fabrics are disclosed in EP 0 071 212 B1. Spacer fabrics are mat-shaped laminates with a cover layer made of a fiber or filament fleece, a base layer, and individual or tufted holding fibers between these layers. These fibers are needled through the particle layer and distributed over the surface of the laminate, connecting the cover layer and the base layer to each other.

[0060] Nonwovens include particularly bonded staple fiber nonwovens, but also filament, meltblown, and spunbonded nonwovens, which usually require additional bonding. Mechanical, thermal, and chemical bonding methods are known for nonwovens. Nonwovens bonded by overstitching with separate threads or by interlacing have proven particularly advantageous. Such bonded nonwovens are produced, for example, on "Malimo" stitch-bonding machines from Karl Mayer, formerly Malimo, and are available from companies such as Hoftex Group AG.

[0061] A Kunit or Multiknit nonwoven can also be used as a backing. A Kunit nonwoven is characterized by the fact that it is produced by processing a longitudinally oriented fiber nonwoven into a fabric with stitches on one side and stitch bars or pile fiber folds on the other, but without threads or prefabricated fabrics. This type of nonwoven has also been produced for some time on stitch-bonding machines such as the "Malimo" type from Karl Mayer.

[0062] A Multiknit nonwoven differs from a Kunit nonwoven in that the nonwoven is bonded by needle piercing on both sides. The starting product for a Multiknit is usually one or two single-sided intermeshed pile fiber nonwoven fabrics produced using the Kunit process. In the final product, both nonwoven surfaces are formed into a closed surface by fiber intermeshing and connected to each other by nearly vertical fibers. The additional integration of other pierceable fabrics and / or scatterable media is also possible.

[0063] Finally, stitch-bonded nonwovens are also particularly suitable. A stitch-bonded nonwoven is made from a nonwoven material with numerous parallel seams. These seams are created by sewing or stitch-bonding continuous textile threads. For this type of nonwoven (also known as Maliwatt), stitch-bonding machines of the "Malimo" type from Karl Mayer are well-known.

[0064] Needle-punched nonwovens are also particularly suitable. In needle-punched nonwovens, a fiber pile is formed into a flat structure using barbed needles. By alternately inserting and withdrawing the needles, the material is consolidated on a needle bar, where the individual fibers intertwine to form a solid flat structure.

[0065] Also particularly advantageous is a staple fiber nonwoven that is pre-consolidated in a first step by mechanical processing or that is a wet-laid nonwoven that has been laid hydrodynamically, wherein between 2% and 50% by weight of the fibers of the nonwoven are melt-laid fibers, in particular between 5% and 40% by weight of the fibers of the nonwoven. Such a nonwoven is characterized in that the fibers are wet-laid or, for example, a staple fiber nonwoven is pre-consolidated by forming loops from fibers of the nonwoven by needling, sewing, air and / or water jet processing. In a second step, heat setting takes place, wherein the strength of the nonwoven is further increased by the melting or fusing of the melt-laid fibers.

[0066] Advantageously, and at least in some areas, the carrier has a smooth-ground surface on one or both sides, preferably a completely smooth surface in each case. The smooth-ground surface may be chintzed, as explained, for example, in EP 1 448 744 A1. This improves the repellency of dirt.

[0067] The starting materials for the carrier are, in particular, (chemical) fibers (staple fibers or continuous filaments) made of synthetic polymers, also called synthetic fibers, made of polyester such as polyethylene terephthalate, polyamide, polyimide, aramid, polyolefin, polyacrylonitrile, or glass, (chemical) fibers made of natural polymers such as cellulosic fibers (viscose, modal, lyocell, cupro, acetate, triacetate, cellulon), such as rubber fibers, such as plant protein fibers and / or animal protein fibers and / or natural fibers made of cotton, sisal, flax, silk, hemp, linen, coconut, or wool. However, the present invention is not limited to the materials mentioned; rather, a multitude of other fibers can be used to produce the nonwoven fabric without requiring inventive activity, as will be apparent to the person skilled in the art.

[0068] Yarns made from the specified raw materials are also suitable. In woven or non-woven fabrics, individual threads may be made from a blended yarn, meaning they may contain both synthetic and natural components. However, the warp and weft threads are usually made from a single-variety yarn.

[0069] Polyester is the preferred material for the carrier due to its excellent resistance to aging and media resistance to chemicals and operating materials such as oil, gasoline, antifreeze, etc. In addition, polyester has the advantage of resulting in a very abrasion-resistant and temperature-resistant carrier, which is of particular importance for the special application of bundling cables in automobiles and, for example, in the engine compartment.

[0070] Advantageously, the basis weight of the carrier is between 30 g / m 2 and 300 g / m 2further advantageous between 50 g / m 2 and 200 g / m 2 , particularly advantageous between 50 g / m 2 and 150 g / m 2 , particularly advantageous between 70 g / m 2 and 130 g / m 2 .

[0071] According to a particularly advantageous embodiment of the invention, a woven fabric or nonwoven made of polyester is used as the carrier, which has a basis weight between 50 g / m 2 and 150 g / m 2 have.

[0072] The finished coated material is preferably cut into a width of 20±2 mm (any other width is also conceivable) and, when used for wrapping elongated goods, is wound helically with an overlap of 50% around the elongated goods - like a cable bundle.

[0073] The finished coated material is preferably provided with a protective film.

[0074] The present invention also relates to a method for sheathing elongated items, such as lines or cable harnesses, wherein an adhesive tape as described above is guided in a helical line around the elongated item or the elongated item is wrapped in the axial direction by the adhesive tape, the elongated item together with the enveloping adhesive tape is brought into the desired arrangement, in particular in the cable harness plan, the elongated item is held in this arrangement, the curable adhesive mass is cured by the supply of heat, for example by a hot air oven or hot air dryer.

[0075] The tape is preferably wrapped helically around the elongated material with an overlap of 30% to 70%, more preferably 40 to 50%, in particular about 50%.

[0076] The adhesive tape is preferably used for wrapping elongated items, such as cable harnesses in particular, with the adhesive tape being guided around the elongated item in a helical motion. This results in the shape of a helix (also called a screw, helical line, cylindrical spiral or coil; a helix is ​​a curve that winds around the surface of a cylinder at a constant pitch). In one variant, the elongated item is wrapped in the adhesive tape in the axial direction. The wrapping of a cable harness with the described adhesive tape is not - as is usual - helical, but in such a way that a longitudinal axis of the tape is aligned essentially parallel to the direction of travel of the cable harness. Viewed in cross-section, the adhesive tape lies around the cable harness in the shape of an Archimedean spiral. This type of winding is also called "wrapping the cable harness".

[0077] Finally, the present invention also relates to a cable harness covered with the cured adhesive tape according to the invention and to a cable harness produced by the method according to the invention.

[0078] In the Fig. 2 shows the adhesive tape in cross-section, which consists of a nonwoven carrier 31, to which a layer of a curable adhesive 32 is applied over the entire surface of one side.

[0079] The adhesive has sunk 25% into the carrier (33), which ensures optimal anchoring.

[0080] A layer of a pressure-sensitive adhesive 34 is applied over the entire surface of the curable adhesive 32. Assessment criteriaConducting the tests

[0081] Unless expressly stated otherwise, the measurements are carried out at a test temperature of 23 ± 1 °C and 50 ± 5 % relative humidity. Dynamic viscosity measurement

[0082] The viscosity measurement is carried out using a Rheometric Scientific DSR 200 N rheometer at 25 °C and in rotation mode at a shear rate of 0.01 s -1 with a cone-plate system with a diameter of 25 mm, alternatively with a shear rate of 1 s -1 or 100 s -1 . Molecular weight

[0083] The molecular weight determinations of the number average molecular weights M n and the weight-average molecular weights M w are carried out by gel permeation chromatography (GPC). The eluent is THF (tetrahydrofuran) with 0.1 vol.% trifluoroacetic acid. The measurement is carried out at 23 °C. The pre-column used is PSS-SDV, 10 µ, 10 3 Å, ID 8.0 mm x 50 mm. For separation, columns PSS-SDV, 10 µ, 10 3 and 10 5 and 10 7with an ID of 8.0 mm x 300 mm each. The sample concentration is 0.5 g / l, and the flow rate is 0.5 ml per minute. Calibration is performed using the commercially available ReadyCal Poly(styrene) high kit from PSS Polymer Standard Service GmbH, Mainz. This is universally converted to polymethyl methacrylate (PMMA) using the Mark-Houwink parameters K and alpha, so that the data are expressed in PMMA mass equivalents. Measurement of the rolling force according to LV 312

[0084] Using an unwinding force tester, the force required to unwind the adhesive tape at a speed of 30 m / min is recorded. The test is conducted in accordance with DIN EN 1944-1996-04.

[0085] Three measurements are taken on three rolls at the beginning, middle, and end of the roll. The mean value is calculated for each section. Measurement of flagging resistance according to LV 312

[0086] The test is carried out in accordance with DIN EN 12035-1996-07 using a steel rod (10 mm diameter, approx. 40 cm length, weight 250 g) with sample strips of 100 mm length each, preferably with a strip width of 19 mm (6 strips; for other widths, the number is adjusted accordingly so that a total width of at least 114 mm is achieved (see Table 1). A smooth surface (e.g., a glass plate of (25 x 35) cm) serves as the base for rolling; weights of 1 kg each are attached to the two ends of the steel rod. Table 1: Test parameters flag resistance Bandwidth Number of strips per rod Total width in mm 9 mm 13 117 12 mm 10 120 15 mm 8 120 19 mm 6 114 25 mm 5 125 38 mm 3 114

[0087] In the Fig. 3 shows the test setup for flagging resistance, viewed vertically from above

[0088] From each sample, at least three test pieces 64, each 100 mm long, are cut with scissors or torn by hand and distributed with the adhesive side facing up, parallel to the edges and evenly across the width of the glass plate 63. The metal rod 61 is positioned over it so that all strips 64 adhere at their beginnings. The steel rod 61, with the two free-running 1 kg weights, is rolled over the strips 64 without additional pressure so that the strips 64 wrap around the rod with as little edge displacement as possible. After the entire length of adhesive tape has been rolled onto the rod 61, it is rolled a further 20 cm (marking 65 on the glass plate 63) to reliably press the tape ends down.

[0089] The wound rod is stored horizontally in the test environment. After 20 to 24 hours, the length of the protruding ends is measured. The average of the individual values ​​is determined. Examples:Example 1 - Production of an adhesive tape

[0090] To produce an adhesive tape according to the invention, the curable adhesive tape layer was prepared in laboratory batches in a heatable and evacuatable 1-liter planetary mixer from PC-Laborsystem. First, the epoxy-functionalized acrylonitrile / butadiene copolymer was preheated to 60°C and then weighed into the mixing container together with the ground reaction product of phthalic anhydride and diethylenetriamine and, if appropriate, the other optional formulation components. The mixture was then mixed for two hours at a temperature of 40°C to 60°C. During the second hour, a vacuum was applied to remove any residual moisture from the mixture. The mixture was then formed into a film of the desired thickness by pressing it between two steel plates covered with siliconized polyester films at 60°C. After forming, the film was cooled to room temperature, whereupon it solidified.

[0091] Some of the curable adhesives were alternatively manufactured in a compounding extruder. For this purpose, the epoxy-functionalized acrylonitrile / butadiene copolymer was pumped into a Krauss Maffei Berstorff twin-screw extruder, model ZE30Rx54D UTXmi, at 60 °C using a drum melt pump. The extruder was externally electrically heated to approximately 40 °C to 60 °C and air-cooled via various fans. It was designed to ensure thorough mixing of the epoxy-functionalized acrylonitrile / butadiene copolymer and the other materials, particularly the ground reaction product of phthalic anhydride and diethylenetriamine, the fillers, and other auxiliaries and additives, with a short residence time in the extruder. For this purpose, the mixing shafts of the twin-screw extruder were arranged so that conveying and mixing elements alternated.The additional materials were added to the pressure-free conveying zones of the twin-screw extruder using suitable dosing equipment and dosing aids. As an alternative to the twin-screw extruder, a planetary roller extruder or a ring extruder can also be used, as these make it easier to keep compounding temperatures below 60 °C. Advantageous extruders also allow for degassing of the compound.

[0092] After the mixture exited the twin-screw extruder at approximately 60 °C (outlet: round nozzle with a diameter of 5 mm), it was formed into a film directly using a downstream two-roller applicator between two incoming, 50 µm thick, double-sided siliconized polyester films. The feed speed was varied between 1 m / min and 20 m / min. One of the incoming, double-sided siliconized polyester films was immediately re-coated after the film had cooled and solidified. For this purpose, a 130 g / m 2 PET fabric covered.

[0093] The pressure-sensitive adhesive used is an aqueous, polymeric dispersion pressure-sensitive adhesive which was prepared according to Example 3 of this document and contains 99% by weight, based on the total weight of the polymer, of 1-butyl acrylate monomer and 1% by weight, based on the total weight of the polymer, of acrylic acid.

[0094] The dispersion pressure-sensitive adhesive was thickened by stirring in a polyurethane associative thickener (Borchigel 0625, OMG Borchers) to a viscosity of approximately 5000 Pa*s at a shear rate of 0.01 s -1 set (measured with cone / plate geometry in rotation mode with a Rheometric Scientific DSR 200 N rheometer).

[0095] Using a doctor blade, a siliconized liner was coated with the thickened sample pressure-sensitive adhesive dispersion on a coating system in such a way that, after drying in a drying tunnel at temperatures of 105 °C, an adhesive mass per unit area weight of 50 g was achieved.

[0096] The adhesive tape layer is coated with the dispersion pressure-sensitive adhesive and a PET-based fabric carrier with 130 g / m 2Basis weight laminated together in such a way that the dispersion pressure-sensitive adhesive is in direct contact with the reactive adhesive tape layer, whereby the siliconized liners are covered again.

[0097] Table 2 lists the base materials (raw materials) used to produce the curable adhesive and the adhesive tape layer, each with its trade name, manufacturer, and the technical data relevant to this invention. Table 2: List of the basic materials used Trade name Description Epoxy equivalent weight (g / Eq) NH equivalent weight (g / Eq) Manufacturer / Supplier Struktol ® Polydis 3610 Epoxy-terminated, chain-extended acrylonitrile / butadiene copolymer (CTBN base)* with bisphenol A diglycidyl ether resin 600 Schill+Seilacher Struktol ® Polydis 3611 Epoxy-terminated, chain-extended acrylonitrile / butadiene copolymer (CTBN base)* with bisphenol F diglycidyl ether resin 550 Schill+Seilacher Struktol ® Polydis 3614 Epoxy-terminated acrylonitrile / butadiene copolymer (CTBN base)* with bisphenol A diglycidyl ether resin 330 Schill+Seilacher Struktol ® Polydis 3691 Pre-crosslinked nitrile rubber epoxidized with bisphenol A diglycidyl ether resin 205 Schill+Seilacher Aradur ® 9506 Ground reaction product of phthalic anhydride and diethylenetriamine, CAS number: 68003-28-1 77,7 Huntsman Talcum Pharma M ® Talc, CAS No.: 14807-96-6, specific surface area: 4.6 m 2 / G Scheruhn GmbH Omyacarb ® 5-GU Ground chalk, average particle diameter: 5.5 µm Omya * CTBN = carboxyl-terminated copolymers of acrylonitrile and butadiene

[0098] The curable adhesive is composed as follows: Table 3: Composition Example 1 Raw material Weight fraction [wt.%] Number of epoxy or NH groups introduced, based on the percentage by weight Ratio of the number of epoxy groups to the number of NH groups, normalized to 1.00 mmol epoxy groups Struktol ® Polydis 3610 91,4 152.3 mmol epoxide 1,00 Aradur ® 9506 8,6 110.7 mmol NH 0,73 sum 100,00

[0099] The production was carried out in a laboratory batch (1 liter) and by extrusion. Results:

[0100] Fracture patterns: A= Adhesive, MB= Mixed fracture, K= Cohesive (no brittle fracture)

[0101] The storage stability was more than one month at 60 °C and more than one year at 23 °C.

[0102] The pressure sensitive adhesive has the properties listed in Table 5. Table 5: Properties of the pressure-sensitive adhesive used Example Comparison product 1 2 tesa® 51036 Unwinding force 30 mm / min [N / cm] 5,8 5,2 5,5 Adhesive strength [N / cm] 3,4 3,2 3,2 Flag resistance + + + Cable compatibility + + + Flag resistance assessment categories: + well suited for the application (< 5 mm flag) O limited suitable for the application (5 to 20 mm flag) - not suitable for the application (> 20 mm flag) Cable compatibility rating categories: + well suited for the application (durability >2500 h) O Limited suitability for the application (resistance 1500 to 2500 h) - not suitable for use (<1500) Example 2 - Production of an adhesive tape according to the invention

[0103] A 20 mm wide and 220 µm thick PET fabric carrier with a basis weight of 130 g / m 2was coated with Acrodur® 950 L with a viscosity of approx. 8 Pa*s, adjusted by the thickener Rheovis PU 1291 (90 wt.% Acrodur® 950 L + 10 wt.% Rheovis PU 1291). Acrodur® 950 L from BASF SE is a formaldehyde-free resin solution with approximately 30% solids content made from modified polyacrylic acid and a polyhydric alcohol.

[0104] The pressure-sensitive adhesive used is an aqueous, polymeric dispersion pressure-sensitive adhesive which was prepared according to Example 3 of this document and contains 99% by weight, based on the total weight of the polymer, of 1-butyl acrylate monomer and 1% by weight, based on the total weight of the polymer, of acrylic acid.

[0105] The dispersion pressure-sensitive adhesive was thickened by stirring in a polyurethane associative thickener (Borchigel 0625, OMG Borchers) to a viscosity of approximately 5000 Pa*s at a shear rate of 0.01s -1set (measured with cone / plate geometry in rotation mode with a Rheometric Scientific DSR 200 N rheometer).

[0106] Using a doctor blade, a siliconized liner was coated with the thickened sample pressure-sensitive adhesive dispersion on a coating system in such a way that, after drying in a drying tunnel at temperatures of 105 °C, an adhesive mass per unit area weight of 50 g was achieved.

[0107] The curable adhesive applied to the PET fabric carrier is laminated with the dispersion PSA before being wound onto a cylindrical core in such a way that the dispersion PSA is in direct contact with the reactive curable adhesive, whereby the siliconized liner is again uncovered. Example 3 - Preparation of a polyacrylate

[0108] A 2 L glass reactor conventional for radical polymerizations was charged with 40 g glycidyl acrylate, 240 g 2-ethylhexyl acrylate, 120 g C 17 -acrylate (triply branched sides with C3, C4 chain segments, BASF SE), 133 g of special boiling point spirit 69 / 95 and 133 g of acetone. After nitrogen gas had been passed through the reaction solution for 45 minutes with stirring, the reactor was heated to 58 °C and 0.2 g of Vazo 67 (DuPont) was added. The external heating bath was then heated to 75 °C and the reaction was carried out at a constant external temperature. After a reaction time of 1 h, 50 g of toluene was added. After 2.5 h, the mixture was diluted with 100 g of acetone. After a reaction time of 4 h, another 0.2 g of Vazo 67 was added. After a polymerization time of 7 h, the mixture was diluted with 100 g of special boiling point spirit 60 / 95 and after 22 h with 100 g of acetone. After 24 h of reaction time, the polymerization was stopped and the reaction vessel was cooled to room temperature. The molecular weight M nof the product was 624,000 g / mol.

[0109] An aqueous, polymeric dispersion pressure-sensitive adhesive consisting of 99 wt.%, based on the total weight of the polymer, of 1-butyl acrylate monomer and 1 wt.%, based on the total weight of the polymer, of acrylic acid is spread onto a siliconized liner using a doctor blade and dried in an oven using a temperature profile from 95 °C to 130 °C.

[0110] The curable adhesive tape layer is laminated with the dispersion pressure-sensitive adhesive before being wound onto a cylindrical core, in such a way that the dispersion pressure-sensitive adhesive is in direct contact with the reactive adhesive tape layer, whereby the siliconized liner is again uncovered. Example 4 - Bending test to determine stiffness

[0111] A test sample consisting of 250 individual wires with a wire cross-section of 0.35 mm 2, was bundled into a sample wiring harness using a 9 mm wide adhesive tape (tesa 51618), resulting in a sample wiring harness with a diameter of 23±5 mm and a length of 300±50 mm. This sample wiring harness was wrapped helically with the stiffening material, ensuring a 50% overlap. The stiffening material was then treated with the appropriate curing method: UV radiation for Example 3 or heat for Examples 1 and 2.

[0112] The hardened sample cable harness was subjected to a bending test to determine the influence of the stiffening material on stiffness. The bending test was performed on a tensile testing machine. For this purpose, the sample cable harness was placed on two jaws spaced 70 mm apart and pressed in the center with a pressure fin to a distance of 30 mm, and then loaded. The force required to deform the measured distance was recorded in Newtons by a tensile testing machine. The test speed was 100 mm / min, both during loading and unloading of the sample cable harness. The test was performed at three different points on the cable harness (beginning, middle, and end). The bending force resulted from the average of the three individual measurements and was evaluated in three categories as follows: Evaluation categories 3-point bending test: + well suited for the application (500 to 750 N) O Limited suitability for the application (400 to 500 N and 700 to 800 N) - not suitable for the application (<400 and >800 N)

[0113] For comparison, a commercially available adhesive tape, tesa ® 51036, was subjected to the same test. The results are shown in Table 2 below. Example 5 - C-shape test to determine stiffness at different temperatures

[0114] A test procedure was developed to determine the stiffness of a bent cable sample (C-cable sample bending test). To produce a C-cable sample (see Fig. 1) a cable with a cross-section of 0.35 mm 2100 times around a holder (1) to form a sample cable set. The holder (1) has two opposing, semicircular guides (2, 3) with a diameter of 120 mm, which are spaced at a distance (A) of approximately 210 mm. The wound cable set (cable bundle (10)) is in Fig. 1 shown.

[0115] The number of cable windings is 100. This results in a sample cable set with a diameter of 15±5 mm and a circumference of 690 mm. At the apices of the semicircular segments and at each of two straight sections (legs), the cable bundle (10) is tied together and secured with cable ties (4, 5, 6, 7, 8, 9) with a tensile force of 210±10 N, so that the cable bundle (10) has sufficient rigidity to prevent deformation after being removed from the holder. To further improve the rigidity of the cable bundle (10), a support (11) is positioned between the legs of the cable bundle (10) and also secured with cable ties.

[0116] The cable bundle (10) thus produced is removed from the holder and wrapped with the adhesive tape to be tested (width 19 mm-20 mm) with a 50% overlap. To do this, wrap it around a cable tie (e.g., 6 or 7) on the leg in the direction of the circular segment (6-4 or 7-5). When the wrap reaches cable tie (4) or 5) at the apex of the semicircle segment, remove it, and continue wrapping to the next cable tie (4-8 or 5-9) on the opposite leg. Repeat the same procedure on the other side, on the other semicircle segment.

[0117] The prepared samples are then subjected to the appropriate cross-linking method. Using side cutters, the samples are cut adjacent to the remaining cable ties to create two "C-shaped" cable samples (C-cable samples), each with an unwrapped section on either side of the semicircular, wrapped section. The cut is made at a distance of the diameter (120 mm) from the apex of the semicircle segment, projected onto the circle center.

[0118] Loops are tied to each leg end of the specimen using a piece of cable, allowing it to be suspended at one end and a weight attached to the other. The remaining cable ties are now removed, as they could falsify the test results. The distance between the legs is now determined.

[0119] One of the two samples is stored at room temperature and the other at 60 °C.

[0120] A 1 kg weight is suspended from each lower leg of the "C-test specimen." After one hour, the deflection of the cable bundle is recorded (deflection behavior for 1 h at RT or 60 °C) and the weight is removed. After one minute, the deflection is determined again (recovery behavior for 1 min at RT or 60 °C). After one hour, the deflection is determined and recorded again (recovery behavior for 1 h at RT or 60 °C).

[0121] The determined C-shape deformation values ​​were classified into three categories: highly suitable for the application, limited suitability for the application, and unsuitable for the application. The categories were evaluated as follows: Evaluation categories C-shape bending test (room temperature): + well suited for the application (< 15% deflection) O limited suitability for the application (≥ 15 to 30%) - not suitable for the application (> 30%) Evaluation categories C-shape bending test (60 °C): + well suited for the application (< 25% deflection) O limited suitability for the application (≥ 25 to 40%) - not suitable for the application (> 40%) Evaluation categories C-shape bending test (recovery behavior at RT and 60 °C): + well suited for the application (< 10% deflection) O limited suitability for the application (≥ 10 to 30%) - not suitable for the application (> 30%)

[0122] For comparison, a commercially available adhesive tape, tesa ® 51036, was subjected to the same test. The results are also listed in Table 1 below. Table 1: 3-point bending test C-shape deformation at RT C-shape recovery behavior at RT Recipe from Example 1 + + + Recipe from Example 2 + + + Recipe from Example 3 + + + tense ® 51036 C-shape deformation at 60 °C C-shape recovery behavior at 60 °C Recipe from Example 1 + + Recipe from Example 2 + + Recipe from Example 3 + + tense ® 51036 Legend: + well suited for the application o limited suitability for use - not suitable for use List of reference symbols 1 bracket 2, 3 semicircular guides 4, 5, 6, 7, 8, 9 cable ties 10 cable bundles 11 Support 31 nonwoven backing 32 layers of a curable adhesive 33 Area into which the curable adhesive has sunk 34 layer of a pressure-sensitive adhesive 61 Staff 62 Winding direction 63 glass plate 64 candidates 65 Marking on glass plate

Claims

[1] Adhesive tape for wrapping elongated goods such as in particular cables or cable harnesses, comprising a band-shaped carrier 31 which is provided with a curable adhesive 32 and on the curable adhesive 32, specifically on the surface of the curable adhesive 32 opposite the carrier 31, a layer of a pressure-sensitive adhesive 34 is applied, wherein a barrier layer is present between the curable adhesive 32 and the layer of pressure-sensitive adhesive 34, wherein the curable adhesive 32 is a thermally curable, meltable adhesive comprising an epoxy-functionalized acrylonitrile / butadiene copolymer having an average of more than 1.5 epoxy groups per molecule and the milled reaction product of phthalic anhydride and diethylenetriamine or as curable adhesive 32 a UV-curable composition is used, comprising, based on the total weight of the composition: • 15 to 50 parts by weight of matrix polymer; • 50 to 85 parts by weight of epoxy resin; • 0.1 to 3 parts by weight of photoinitiator, wherein the matrix polymer forms a monolayer self-supporting film in which epoxy resin and photoinitiator are embedded. [2] Adhesive tape according to claim 1, characterized by that the pressure-sensitive adhesive 34 is a dried polymer dispersion. [3] Adhesive tape according to one of claims 1 or 2, characterized by that the pressure-sensitive adhesive 34 is crosslinker-free. [4] Adhesive tape according to one of claims 1 to 3, characterized by that the pressure-sensitive adhesive 34 is not curable. [5] Adhesive tape according to one of the preceding claims, characterized by that the carrier material 31 comprises a woven textile fabric, a nonwoven fabric and / or a film. [6] Adhesive tape according to one of the preceding claims, characterized by that the basis weight of the textile carrier 31 is between 30 g / m 2 and 300 g / m2 lies. [7] Adhesive tape according to one of the preceding claims, characterized by that the mass application of the pressure-sensitive adhesive 34 is between 40 g / m 2 and 500 g / m 2 lies. [8] Method for sheathing elongated goods, such as in particular cables or cable harnesses, wherein an adhesive tape according to one of the preceding claims is guided in a helical line around the elongated goods or the elongated goods are wrapped in the axial direction by the adhesive tape, the elongated goods together with the enveloping adhesive tape are brought into the desired arrangement, in particular in the cable harness plan, the elongated goods are held in this arrangement and the curable adhesive mass 32 is caused to cure. [9] Method for sheathing elongated material, such as in particular cables or cable harnesses, wherein an adhesive tape according to one of claims 1 to 7 is first activated and immediately thereafter guided in a helical line around the elongated material or the elongated material is enveloped in the axial direction by the adhesive tape, the elongated material is then brought together with the enveloping adhesive tape into the desired arrangement, in particular into the cable harness plan, and is held in this arrangement while the curable adhesive mass 32 cures. [10] A cable harness which is covered with an adhesive tape according to one of claims 1 to 7 or which can be produced by a method according to one of claims 8 or 9.

Images