EP4168506A1

EP4168506A1 - Conductive double-sided pressure-sensitive adhesive strip

Info

Publication number: EP4168506A1
Application number: EP21729548.4A
Authority: EP
Inventors: Jan-Gerd Pennekamp
Original assignee: Tesa SE
Current assignee: Tesa SE
Priority date: 2020-06-23
Filing date: 2021-06-01
Publication date: 2023-04-26
Also published as: CN115698210A; DE102020207783A1; WO2021259599A1; US20230242794A1; KR20230003199A

Abstract

The present invention relates to a double-sided pressure-sensitive adhesive strip, in which at least one conductive component connects the two opposite surfaces of the pressure-sensitive adhesive strip, which are provided for bonding, in the z direction and thereby ensures a conductivity of the pressure-sensitive adhesive strip in the z direction. The invention also relates to a component and/or a composite, which is bonded with the conductive pressure-sensitive adhesive strip and to the use of the conductive pressure-sensitive adhesive strip.

Description

Conductive double-sided adhesive strip

The present invention relates to a double-sided, i.e. double-sided adhesive, pressure-sensitive adhesive strip which is conductive in the z-direction, i.e. essentially perpendicular to the final adhesive surface. The invention also relates to a component or a composite that is glued to the conductive pressure-sensitive adhesive strip and the use of the conductive pressure-sensitive adhesive strip.

So far there have been adhesive films on the market which - mostly using additives - are made conductive in order to guarantee grounding. These are typically intended to prevent static build-up and to shield against electromagnetic interference. The targeted power and data transport is not possible.

US 5087494 A and US 4460804 A also describe a metal conductor embedded in the one-sided adhesive tape. The electrical conduction takes place exclusively along the length of the adhesive tape and is not suitable for connecting electrically conductive contacts in the z-direction. As a result, a power supply for bonded components is not possible or only possible to a very limited extent.

WO 2018/229609 A1 describes a stretchable conductor which comprises a substrate with a first main surface, the substrate comprising an elastomer material, and an elongated wire on the first main surface of the substrate. The wire includes a first end and a second end and at least one arcuate region between the first end and the second end.

Pressure-sensitive adhesives and their production, for example from solution or from the melt, are also, for example, in Gerd habenicht's textbook: “Gluing: Basics, Technologies, Applications”, 6th edition, 2009, Chapter 3.4 and in Donatas Satas: “Handbook of Pressure Sensitive Adhesive Technology ”, 3rd edition, 1999.

In times when the term “smart” is no longer only used in high-tech product groups, but is also increasingly finding its way into everyday products, it is also true to electrify the components involved accordingly in order to expand the field of application of adhesive films. The common methods in the automotive industry for supplying various components with power are mostly soldering, plugging in or clamping of power and data lines. What these methods have in common is that they require an additional and often manual process step to ensure the flow of electricity and data. In addition, the components must be attached by gluing, plugging or screwing.

The mentioned disadvantages of the prior art are solved by a double-sided pressure-sensitive adhesive strip that is conductive in the z-direction, i.e. essentially perpendicular to the final bond area. According to the invention, the conductivity in the z-direction is brought about by at least one conductive component, for example by at least two conductive components, such as, in particular, by precisely two conductive components, which connect the two opposite surfaces of the pressure-sensitive adhesive strip intended for bonding in the z-direction. According to the invention, the surfaces intended for bonding are connected in the z-direction by conductive components in those embodiments of the pressure-sensitive adhesive strip in which the conductive components are arranged in the area between the surfaces intended for bonding in a direction which, in addition to a proportion in z-direction also has a portion in the x- and / or y-direction. The conductive components are preferably arranged in the area between the surfaces provided for the gluing, essentially perpendicular to the final gluing surface.

Usually, the conductive components are also kinked and glued to the surfaces of the pressure-sensitive adhesive strip provided for gluing, which enables easier contacting of the contacts or power lines of the components to be glued. These sections of the conductive components glued to the surfaces thus form contact areas lying in the x, y plane.

According to the invention, the usually at least two conductive components used are preferably identical or of the same type, but they can also be different. The conductive components are preferably made of copper. Further preferred embodiments of the double-sided pressure-sensitive adhesive strip are described in the claims. The supply of a component with electricity, the data transport between them, but also the grounding takes place via at least one component with one or more conductive wires. The electrification of double-sided adhesive tapes, which establish contact between the consumer and the power source, makes it possible to combine the above-mentioned work steps in one, to automate them as much as possible, to accelerate them significantly and thus to make the processes more efficient. The invention enables various add-on parts to be supplied with voltage directly via the adhesive strip, which corresponds to an integration of functions. The assembly effort in production, for example in automobile construction, is reduced. Soldering, plugging or clamping is no longer necessary to assemble the consumer, simply gluing on is sufficient. The invention enables many process steps to be outsourced. The assembled assemblies are delivered to the OEM and directly supplied with power through the bonding process. Multifunctional adhesive tapes according to the invention can not only conduct electricity, but data can also be transported or other electronics (sensors) can be integrated into the pressure-sensitive adhesive strip, for example for protection against break-ins.

In particular, the invention enables cost savings. On the one hand, this is due to a reduced assembly time, since in particular no screwing or other connection technology is required. No additional connectors are necessary either, i.e. there are falling component prices. In addition, up to now, connectors mostly had to be connected by hand with cables, while the present invention enables complete automation. Automobile manufacturers could also outsource the cabling, as this is already integrated in the adhesive strip, which is sometimes used for assembly anyway.

The technology on which the invention is based can also be transferred from the automotive industry, with a large field of application in the exterior and interior, to other markets, for example to the electronics industry. With the growing proportion of “smart” devices, the electrification of adhesives is also promising. The invention offers the possibility of supplying components with electricity, for which it was previously only possible with a great deal of effort. There is also a steadily growing market in view of the increasing number of electrical components.

In addition, the full-surface gluing with a pressure-sensitive adhesive strip according to the invention can prevent the corrosion of lines. The lines are completely surrounded by, in particular, foam-like pressure-sensitive adhesive strips according to the invention; no water can enter the body, provided the component is glued over the entire surface. at Plugged-in components such as indicators, on the other hand, are not automatically sealed. The water can get behind the component and thus the interior of the body; cables may lie directly here under certain circumstances.

According to the invention, flat cables, with or without insulation, are preferably applied to the adhesive strip, via which the contact between the consumer and the power source is established. The use of metal foils such as copper foils, which are typically uninsulated, can also be considered.

In a preferred embodiment, in the case of the double-sided pressure-sensitive adhesive strip, the conductive components are folded over around the edges of the pressure-sensitive adhesive strip. The two conductive components are usually arranged on opposite edges of the pressure-sensitive adhesive strip, i.e. on opposite sides of the pressure-sensitive adhesive strip, in particular on the opposite, shorter sides of the pressure-sensitive adhesive strip. This embodiment can be implemented in a particularly simple manner. Figure 1 shows the cross section of such a double-sided pressure-sensitive adhesive strip (1) with two conductive components (2, 3), such as flat cables, which are folded around the edges of the pressure-sensitive adhesive strip (1) on opposite sides of the pressure-sensitive adhesive strip (1) .

In a further preferred embodiment of the double-sided pressure-sensitive adhesive strip, the conductive components are passed through the pressure-sensitive adhesive strip in the z-direction, so that the barrier effect can be used. After the conductive components have passed through the adhesive strip, the protruding areas of the conductive components can be bent, for example, and glued to the corresponding surfaces of the adhesive strip. When installed, the cable is not exposed and is therefore not directly exposed to the effects of the weather. The current flow is guaranteed here again via the tape. FIG. 2 shows the cross section of such a double-sided pressure-sensitive adhesive strip (1) with two conductive components (2, 3), such as, for example, flat cables, which are passed through the pressure-sensitive adhesive strip (1) in the z-direction. The areas of the conductive components (2, 3) protruding from the pressure-sensitive adhesive strip (1) are also kinked and glued to the corresponding surfaces of the adhesive strip (1) provided for subsequent bonding to components. The contact is made via corresponding contact points provided on the component and, for example, the body part of the motor vehicle. In a further preferred embodiment of the pressure-sensitive adhesive strip, the conductive components such as uninsulated copper cables, and in particular their areas that are glued to the surfaces of the adhesive strip intended for subsequent gluing to components, are formed into a sinusoidal conductor path. The sinusoidal conductor track makes it possible to stretch the adhesive strip in the x-direction and thus to realize radii or curves. A curved laying or gluing of flexible conductor tracks is made possible. In this context, suggestions for particularly preferred embodiments are provided, for example, by WO 2018/229609 A1.

Figure 3 also shows the cross section of a composite

(i) a pressure-sensitive adhesive strip (1) according to the invention with two conductive components (2, 3) folded around the edges of the pressure-sensitive adhesive strip, as described in FIG. 1, which is glued between

(ii) a component (6) with contacts and / or power lines (4,5) which are in contact with the two conductive components (2, 3) of the pressure-sensitive adhesive strip (1), i.e. a bonded component, and

(iii) a consumer (7) with contacts and / or power lines (8,9) which are in contact with the two conductive components (2, 3) of the pressure-sensitive adhesive strip (1), i.e. a component to be glued.

The contacts or power lines typically each represent a plus or minus pole. In addition, lines can also be used for data transport or for grounding. A power line such as a flat cable can also consist of several individual wires.

Accordingly, the present invention also relates to a component with power lines and / or contacts to which a pressure-sensitive adhesive strip according to the invention is glued, the power lines and / or contacts of the component being in contact with the conductive components of the pressure-sensitive adhesive strip. The invention accordingly also relates to a composite of a first component with contacts and / or power lines and a consumer with contacts and / or power lines as a further component, the two components being glued by means of a pressure-sensitive adhesive strip according to the invention, the contacts and / or power lines of the first Component and the further component are each in contact with the conductive components of the pressure-sensitive adhesive strip. The pressure-sensitive adhesive strip contains one or more pressure-sensitive adhesive layers, ie adhesive layers consisting of a pressure-sensitive adhesive, and optionally one or more preferably viscoelastic intermediate carrier layers, ie carrier layers arranged between other layers.

In a particularly preferred embodiment, the pressure-sensitive adhesive strip is carrier-free and typically consists of a single layer of pressure-sensitive adhesive. The thickness of the pressure-sensitive adhesive layer is usually from 20 to 5000 μm, preferably from 50 to 2500 μm. In one variant, which is typical for barrier adhesives, for example, the thickness of the pressure-sensitive adhesive layer is in particular from 25 to 300 μm, such as from 50 to 150 μm, for example. In another variant, which is typical in particular for foamed pressure-sensitive adhesives, the thickness of the pressure-sensitive adhesive layer is preferably from 100 to 2000 μm, more preferably from 400 to 1500 μm, in particular from 400 to 1200 μm, for example from 500 to 1000 μm.

In an alternative preferred embodiment, the pressure-sensitive adhesive strip is composed of a preferably viscoelastic intermediate carrier layer and in each case a pressure-sensitive adhesive layer arranged on the two opposite surfaces of the intermediate carrier layer. The two pressure-sensitive adhesive layers can be identical or different with regard to their thickness or chemical composition. The intermediate carrier layer usually has a thickness between 5 and 125 μm, preferably between 10 and 60 μm, more preferably between 10 and 50 μm, and even more preferably between 10 and 40 μm. In an alternative embodiment, which is typical in particular for foamed intermediate carrier layers, the thickness of the intermediate carrier layer is preferably 100 to 3000 μm, more preferably 400 to 1500 μm, in particular 500 to 1200 μm, such as 600 to 1000 μm. The pressure-sensitive adhesive layers, independently of one another, usually have a thickness between 20 and 1000 μm, more preferably between 40 and 200 μm and in particular from 50 to 150 μm.

In accordance therewith, pressure-sensitive adhesive strips according to the invention typically have a thickness of 20 to 5000 μm. In a preferred variant, which is typical in particular for unfoamed adhesive strips, the thickness of the pressure-sensitive adhesive strip is preferably from 25 to 500 μm, more preferably from 50 to 400 μm and in particular from 100 to 300 μm. In a further preferred variant, which is typical in particular for adhesive strips with at least one foamed layer, the thickness of the pressure-sensitive adhesive strip is preferably 100 to 3000 μm, more preferably 400 to 2000 mih, especially 500 to 1500 mih, such as 600 to 1200 mih.

According to the invention, a pressure-sensitive adhesive is understood, as is customary in common parlance, to be a substance which is permanently tacky and also tacky at least at room temperature. It is characteristic of a pressure-sensitive adhesive that it can be applied to a substrate by pressure and remains adhered there, the pressure to be applied and the duration of this pressure being not defined in more detail. In general, but basically depending on the exact type of pressure-sensitive adhesive as well as the substrate, the temperature and the air humidity, the application of a short-term, minimal pressure, which does not go beyond a light touch for a short moment, is sufficient to achieve the adhesive effect in other cases a longer-term exposure to a higher pressure may be necessary.

Pressure-sensitive adhesives have special, characteristic viscoelastic properties which lead to permanent tack and adhesiveness. They are characterized by the fact that when they are mechanically deformed, both viscous flow processes and the build-up of elastic restoring forces occur. With regard to their respective proportions, the two processes have a certain relationship to one another, depending both on the precise composition, the structure and the degree of crosslinking of the PSA and on the speed and duration of the deformation and on the temperature.

The proportional viscous flow is necessary to achieve adhesion. Only the viscous components, often caused by macromolecules with relatively high mobility, enable good wetting and good flow onto the substrate to be bonded. A high proportion of viscous flow leads to high pressure-sensitive tack (also referred to as tack or surface tack) and thus often also to high adhesion. Strongly crosslinked systems, crystalline or glass-like solidified polymers are generally not or at least only slightly tacky due to the lack of flowable components.

The proportional elastic restoring forces are necessary to achieve cohesion. In addition, the restoring forces ensure permanent good contact, since the conductor tracks are pressed against the contacts. They are caused, for example, by very long-chain and strongly tangled, as well as physically or chemically cross-linked macromolecules and enable the transfer to an adhesive bond attacking forces. They lead to the fact that an adhesive connection can withstand a permanent load acting on it, for example in the form of permanent shear stress, to a sufficient extent over a longer period of time.

The storage modulus (G ‘) and loss modulus (G”) that can be determined by means of dynamic mechanical analysis (DMA) are used for a more precise description and quantification of the degree of elastic and viscous components as well as the relationship between the components. G ‘is a measure for the elastic part, G“ is a measure for the viscous part of a substance. Both sizes are dependent on the deformation frequency and the temperature.

The sizes can be determined with the aid of a rheometer. The material to be examined is exposed to a sinusoidally oscillating shear stress, for example in a plate-plate arrangement. In devices controlled by shear stress, the deformation is measured as a function of time and the time offset of this deformation with respect to the introduction of the shear stress. This time offset is referred to as the phase angle d.

The storage modulus G 'is defined as follows: G' = (t / g) _* cos (ö) (T = shear stress, g = deformation, d = phase angle = phase shift between shear stress and deformation vector). The definition of the loss modulus G "is: G" = (t / g) · sin (δ) (T = shear stress, g = deformation, d = phase angle = phase shift between shear stress and deformation vector).

A compound is particularly considered a pressure-sensitive adhesive and is defined as such within the meaning of the invention if at 23 ° C in the deformation frequency range of 10 ° to 10 ¹ rad / sec both G 'and G ″ are at least partially in the range of 10 ³ up to 10 ⁷ Pa. “Partly” means that at least a section of the G 'curve lies within the window that is defined by the deformation frequency range from 10 ° up to and including 10 ¹ rad / sec (abscissa) and the range of G' values from 10 ³ up to and including 10 ⁷ Pa (ordinate), and if at least a section of the G “curve is also within the corresponding window.

The pressure-sensitive adhesive strip according to the invention can, for example, comprise at least one pressure-sensitive adhesive layer which is based on poly (meth) acrylate, silicone (co) polymer, Nitrile rubber, ie acrylonitrile-butadiene rubber, or synthetic rubber, it being possible for the synthetic rubber to be chemically and / or physically crosslinked.

In a preferred embodiment, the pressure-sensitive adhesive strip comprises at least one pressure-sensitive adhesive layer based on poly (meth) acrylate. Poly (meth) acrylates are particularly advantageous because they are resistant to oxidation, transparent and colorless and are not subject to yellowing in sunlight. The person skilled in the art has extensive information on pressure-sensitive adhesives based on poly (meth) acrylate and their production, for example from Donatas Satas: “Handbook of Pressure Sensitive Adhesive Technology”, 3rd edition, 1999, chapter 19. According to the invention, a “Poly (meth "acrylate" typically means a polymer which is obtainable by free-radical polymerization of acrylic and / or methacrylic monomers and optionally other copolymerizable monomers. In particular, a “poly (meth) acrylate” is understood to mean a polymer whose monomer base consists of at least 50 wt .-%, based on the total monomer base of the polymer in question, are included.

In a further preferred embodiment, the pressure-sensitive adhesive strip comprises at least one pressure-sensitive adhesive layer based on synthetic rubber, which is preferably a vinyl aromatic block copolymer. Since there are various synthetic rubbers, a wide range of properties can be represented depending on the type of rubber used. PSA layers based on vinyl aromatic block copolymers can, in particular, have high bond strengths even on surfaces with low surface energy, the maximum bond strengths being achieved relatively quickly. They also show a high drop in bond strength during stretching and can therefore be used in stretchable systems. In addition, because of their frequently low water vapor permeation, they are often used as barrier adhesives. The person skilled in the art has extensive information on PSAs based on synthetic rubber, such as in particular vinyl aromatic block copolymers, and their production, for example from Donatas Satas: “Handbook of Pressure Sensitive Adhesive Technology”, 3rd edition, 1999, chapters 14-16. In a particularly preferred embodiment, the at least one pressure-sensitive adhesive layer based on synthetic rubber, such as, in particular, vinyl aromatic block copolymer, has a water vapor permeability (WVTR) of less than 100 g / (m ^{2 *} d), more preferably less than 50 g / (m ^{2 *} d) ), more preferably of less than 40 g / (m ^{2 *} d), in particular of less than 30 g / (m ^{2 *} d), such as, for example, of less than 20 g / (m ^{2 *} d). The use of such a barrier adhesive means that the penetration of moisture can be prevented or at least minimized, ie in particular the effects of the weather can be minimized. A good barrier adhesive typically has a low permeability to oxygen and, in particular, to water vapor, has adequate adhesion to the substrate and can flow well onto it. A low flow capacity on the substrate can reduce the barrier effect at the interface due to incomplete wetting of the surface of the substrate and remaining pores, since a lateral entry of oxygen and water vapor is made possible regardless of the properties of the adhesive. Only when the contact between the mass and the substrate is continuous are the properties of the mass the determining factor for the barrier effect of the adhesive mass. Suitable PSA layers based on vinyl aromatic block copolymer with a barrier effect and their production are for example in DE 10 2008 047964 A1, DE 10 2009 036968 A1, DE 10 2009 036970 A1, DE 10 2011 085034 A1, DE 10 2012202377 A1 and DE 10 2015 212 058 A1 described.

In a further embodiment, the pressure-sensitive adhesive strip can contain at least one pressure-sensitive adhesive layer which is based on a blend of poly (meth) acrylate and synthetic rubber, such as, in particular, vinyl aromatic block copolymer. Such blends should in particular combine the advantageous properties of the individual polymer components. Such PSA layers are disclosed, for example, in DE 10 2013 215296 A1 and DE 10 2013 215297 A1.

Pressure-sensitive adhesives according to the invention can have at least one adhesive resin in order to increase the adhesion in the desired manner. According to the general understanding of the art, an “adhesive resin” is understood to mean a low molecular weight, oligomeric or polymeric resin which increases the adhesion (the tack, the inherent tack) of the PSA in comparison to the PSA which does not contain adhesive resin but is otherwise identical. The person skilled in the art knows preferred amounts and types of adhesive resin, which among other things depend on the type of polymer base, see for example in Donatas Satas: “Handbook of Pressure Sensitive Adhesive Technology ”, 3rd edition, 1999. Useful information on this is also disclosed, for example, in DE 10 2017 206 083 A1.

Pressure-sensitive adhesives according to the invention can contain further additives, such as in particular:

• Foaming agents, such as, for example, microballoons, typically in a proportion of 0.2 to 10% by weight, preferably 0.25 to 5% by weight, based in each case on the total weight of the pressure-sensitive adhesive,

Primary antioxidants, such as sterically hindered phenols, preferably in a proportion of 0.2 to 1% by weight based on the total weight of the pressure-sensitive adhesive,

Secondary antioxidants, such as phosphites, thioesters or thioethers, preferably in a proportion of 0.2 to 1% by weight based on the total weight of the pressure-sensitive adhesive,

• Process stabilizers such as C radical scavengers, preferably with a proportion of 0.25 to 1% by weight based on the total weight of the pressure-sensitive adhesive,

• Light stabilizers such as UV absorbers or sterically hindered amines, preferably in a proportion of 0.2 to 1% by weight based on the total weight of the pressure-sensitive adhesive,

• Processing aids, preferably in a proportion of 0.2 to 1% by weight based on the total weight of the pressure-sensitive adhesive,

• End block reinforcement resins, preferably with a proportion of 0.2 to 10% by weight based on the total weight of the pressure-sensitive adhesive,

• Plasticizers, such as plasticizer oils, or low molecular weight liquid polymers, such as low molecular weight polybutenes, and / or

• where appropriate, further polymers, preferably of an elastomeric nature; appropriately usable elastomers include those based on pure hydrocarbons, for example unsaturated polydienes such as natural or synthetic polyisoprene or polybutadiene, chemically essentially 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, preferably in a proportion of 0.2 to 10% by weight, based on the total weight of the pressure-sensitive adhesive.

The type and amount of the mixing components can be selected as required. If additives which are capable of migration are used in the PSAs, then additives of the same type are preferably also used in the carrier layer, if present.

According to a further preferred embodiment of the pressure-sensitive adhesive strip, at least one pressure-sensitive adhesive layer is foamed, preferably with microballoons. Foamed PSA systems have been known for a long time and are described in the prior art. Basically, polymer foams can be produced in two ways. On the one hand through the action of a propellant gas, be it added as such or resulting from a chemical reaction, on the other hand through the incorporation of hollow spheres into the material matrix. Foams made in the latter way are known as syntactic foams. Masses foamed with hollow microspheres are characterized by a defined cell structure with a uniform size distribution of the foam cells. With hollow microspheres, closed-cell foams without cavities are obtained, which, compared to open-cell variants, are characterized, among other things, by a better sealing effect against dust and liquid media. In addition, chemically or physically foamed materials are more prone to irreversible collapse under pressure and temperature and often show a lower cohesive strength. Particularly advantageous properties can be achieved if expandable microspheres (also referred to as “microballoons”) are used as microspheres for foaming. Due to their flexible, thermoplastic polymer shell, such foams are more adaptable than those filled with non-expandable, non-polymeric hollow microspheres (for example hollow glass spheres). They are better suited to compensate for manufacturing tolerances, as they are the rule for injection molded parts, for example, and, due to their foam character, can also better compensate for thermal stresses. Furthermore, the selection of the thermoplastic resin for the polymer shell can further influence the mechanical properties of the foam. For example, even if the foam has a lower density than the matrix, it is possible to produce foams with higher cohesive strength than with the polymer matrix alone. Typical foam properties such as adaptability to rough Substrates with a high cohesive strength can be combined for self-adhesive foams. Briefly summarized, the foaming, in particular by means of microballoons, results in a high adaptability to rough surfaces and can thus, for example, simplify uniform, wrinkle-free bonding on uneven surfaces. In addition, it can at least partially compensate for the elevation of the conductive components. Foamed systems also often have a higher level of shock resistance. Microballoon foams are also typically superior to other foams due to their higher cohesive strength.

Suitable pressure-sensitive adhesive layers foamed with microballoons based on synthetic rubber, such as, in particular, vinylaromatic block copolymers, and their production are disclosed, for example, in DE 10 2008004388 A1, DE 10 2008056980 A1, DE 102015206076 A1 and DE 10 2017 218 519 A1. Suitable pressure-sensitive adhesive layers foamed with microballoons based on poly (meth) acrylate and their production are disclosed, for example, in DE 10 2008 004 388 A1, DE 10 2008 052625 A1, DE 10 2008 059050 A1 and DE 10 2016 209707 A1. Suitable foamed with microballoons

Pressure-sensitive adhesive layers based on a blend of poly (meth) acrylate and synthetic rubber, such as, in particular, vinyl aromatic block copolymers, and their production are disclosed, for example, in DE 10 2013 215296 A1 and DE 10 2013 215297 A1. As the cited documents show, the foamed pressure-sensitive adhesive layer can typically in each case be varied over a wide range of thicknesses, to which crosslinking can also contribute.

In pressure-sensitive adhesive strips according to the invention with at least one, preferably viscoelastic, intermediate carrier layer, the intermediate carrier layer can also be foamed as an alternative or in addition to the pressure-sensitive adhesive layer, likewise preferably with microballoons. The foaming of an intermediate carrier layer results in comparable advantages to the foaming of a pressure-sensitive adhesive layer. In a preferred embodiment, the foamed intermediate carrier layer is based on poly (meth) acrylate. For example, DE 102008052625 A1, DE 102008059050 A1 and DE 102012212883 A1 describe an acrylate-based viscoelastic foam carrier and its production. Pressure-sensitive adhesive layers arranged thereon can have a different polymer base; they can, for example, likewise be based on poly (meth) acrylate or else on synthetic rubber such as vinyl aromatic block copolymer. As the documents mentioned show, the foamed Intermediate carrier layer can typically be varied over a wide range of thicknesses, to which a crosslinking can also contribute.

In principle, various stretchable or non-stretchable film carriers, as disclosed, for example, in EP 3333236 A1, can be used in pressure-sensitive adhesive strips according to the invention with an intermediate carrier layer.

According to the invention, an intermediate carrier layer in the form of a carrier film such as a polymer film can also be used, which has a water vapor permeability (WVTR) of less than 0.1 g / (m ^{2 *} d) and an oxygen permeability (OTR) of less than 0.1 cm ³ / (m ^{2 *} d ^* bar), as described for example in DE 10 2009 036970 A1 and DE 10 2015 212 058 A1.

As described above, the conductive adhesive strip according to the invention can be used for bonding (a) a first component with contacts and / or power lines to (b) a consumer with contacts and / or power lines as a further component, the contacts and / or power lines of the first The component and the further component are each in contact with the conductive components (data or current) of the pressure-sensitive adhesive strip.

Possible applications of the pressure-sensitive adhesive strip according to the invention are, for. B. to be seen in the interior and exterior, ie interior and exterior, of an automobile. For example, indicators, illuminated trim strips and spoilers with integrated brake lights can be fixed and supplied with power in one step. The invention can also be used for license plate lighting. In particular, integration can also take place in GPS or radio antennas. It is also conceivable to attach model-dependent equipment elements, such as parking sensors or daytime running lights, by means of electrified pressure-sensitive adhesive strips according to the present invention. In terms of production technology, this has the advantage that such equipment-specific components can simply be glued on. Specifically, based on this example, this means that all special equipment can be attached to a "standard bumper". The manufacturer no longer has to have different versions of the bumper manufactured, but merely provide a contact option at the appropriate points. This leads to a significant reduction in costs, as the trend is increasingly towards individualising cars in terms of equipment and adapting them to the needs and wishes of the respective customer. There are also many in the vehicle interior Possible applications, since in connection with the increasingly important user experience, an increasing proportion of electronic components is usually associated with it. The ambient lighting or the on-board electronics (gluing displays and touch panels) should be mentioned here in particular. Various areas of application can also be opened up in the field of battery technology. The technology can also be transferred to other areas, for example general electronics and areas that have not yet been described as typical areas of application for adhesive tapes or pressure-sensitive adhesive strips. Lighting technology should be mentioned here as an example. For example, pressure-sensitive adhesive strips with a barrier effect represent a reliable solution for encapsulation in display and lighting applications. The pressure-sensitive adhesive strip according to the invention is also suitable as an adhesive solution with good electrical conductivity for shielding and grounding electronic devices.

The introduction of sensors can also be useful, particularly with regard to smart materials. On the one hand, the failure of a bonded connection can be detected at an early stage, because before the bonded connection fails completely, the circuit is first interrupted. This can serve as an indicator of detecting a failed bond before failure occurs (impending failure of a bond is also possible with pressure sensors). On the other hand, it is also conceivable to use sensors for safety technology. Tapes equipped with sensors can be inserted directly into the window frame for gluing glass panes and used to detect vibrations and / or pressure. With a view to smart living, door and window seals can also be developed with the appropriate sensors embedded in the adhesive film.

In addition, it can be said that electrification or functional integration in double-sided adhesive applications offers great potential, especially in the field of e-mobility. Existing methods can be replaced and completely new areas of application can be opened up, as, according to the current state of knowledge, there is no comparable product on the market.

In a nutshell, the applications of the inventions are subdivided according to the respective areas of application, therefore in particular as follows: a) in the exterior of the automobile: • Indicators, spoilers with integrated brake lights, trim strips with integrated lights, daytime running lights, GPS and radio antennas, license plate lighting

• Safety electronics: the parking sensor system is glued on as a strip (there are no individual recesses for each sensor in the bumper, i.e. a model-independent bumper option is simply glued on) b) In the interior of the automobile:

• Interior lighting (ambient lighting)

• On-board electronics (touch panels) c) General electronic applications:

• Display bonding, touch panels (e.g. household appliances), lighting technology, sensors, e.g. for window bonding (burglar protection) d) Construction industry or DIY:

• Gluing windows in profiles

• Dimming glass or smart glass

• Integration of sensors for burglary protection (pressure or vibration sensors)

• Lighting technology e) Other: a. Sensor technology in adhesive strips to detect failure of an adhesive connection at an early stage (if the current flow is interrupted, this indicates a defect or through pressure sensors)

Characters:

On the basis of the figures described below, particularly advantageous embodiments of the invention are explained in more detail, without thereby wishing to restrict the invention unnecessarily. Figure 1 shows the cross-section of a double-sided pressure-sensitive adhesive strip (1) according to the invention with two conductive components (2, 3), such as flat cables, which are folded around the edges of the pressure-sensitive adhesive strip (1) on opposite sides of the pressure-sensitive adhesive strip (1). . FIG. 2 shows the cross section of a double-sided pressure-sensitive adhesive strip (1) according to the invention with two conductive components (2, 3), such as, for example, flat cables, which are passed through the pressure-sensitive adhesive strip (1) in the z-direction. The protruding areas of the conductive components (2, 3) are kinked and glued to the corresponding surfaces of the adhesive strip (1). Figure 3 shows the cross section of a composite

(iii) a consumer (7) with contacts and / or power lines (8,9) which are in contact with the two conductive components (2, 3) of the pressure-sensitive adhesive strip (1), i.e. a component to be glued. Examples:

The invention is explained in more detail below using a few exemplary pressure-sensitive adhesive strips with conductive components. Using the examples described below, particularly advantageous embodiments of the invention are explained in more detail without wishing to restrict the invention unnecessarily. Double-sided pressure-sensitive adhesive strips with at least one, for example two, conductive components, according to the present invention can be based, for example, on the following pressure-sensitive adhesive strips:

1 . a pressure-sensitive adhesive strip consisting of a pressure-sensitive adhesive layer based on synthetic rubber with a barrier effect, as for example in Example 1 of DE 10 2015 212 058 A1. In the present invention, a good barrier effect means that the effects of the weather, in particular moisture, do not lead to corrosion of the contacts. For components that are exposed to constant weathering, for example, this is extremely relevant for a long service life. One example is the exterior parts of automobiles.

2. A pressure-sensitive adhesive strip consisting of a pressure-sensitive adhesive layer foamed with microballoons and based on vinyl aromatic block copolymer, as described, for example, in Example B1 from DE 10 2017 218 519 A1.

3. a pressure-sensitive adhesive strip consisting of a pressure-sensitive adhesive layer foamed with microballoons and based on poly (meth) acrylate, for example as in the example

10 of DE 10 2008 004388 A1.

4. a pressure-sensitive adhesive strip consisting of a viscoelastic acrylate foam carrier and two pressure-sensitive adhesive layers based on vinyl aromatic block copolymer arranged thereon, as described, for example, in the examples of DE 10 2012 212 883 A1.

5. a pressure-sensitive adhesive strip consisting of a viscoelastic acrylate foam carrier and two pressure-sensitive adhesive layers based on poly (meth) acrylate arranged thereon, as described, for example, in example MT5 of DE 10 2008 052625 A1). In the double-sided pressure-sensitive adhesive strip according to the invention, the conductive

Components can be folded over, for example, around the edges of the pressure-sensitive adhesive strip or passed through the pressure-sensitive adhesive strip in the z-direction. The conductive components can be, for example, insulated flat cables (flat cables) Leoni exFC. Soft-annealed electrolytic copper is used for this. Possible insulations are PVC, thermoplastic elastomer based on polyurethane, thermoplastic elastomer based on polyester, PP or ETFE. The width can be 1 - 7mm, the thickness 0.1 - 0.5mm. Test methods

Unless otherwise stated, all measurements were carried out at 23 ° C. and 50% rel. Humidity carried out.

The data were determined as follows:

OTR, WVTR

The oxygen permeability (OTR) and water vapor permeability (WVTR) of a layer are determined in accordance with DIN 53380 Part 3 or ASTM F-1249. For this purpose, the layer is applied to a permeable membrane. The oxygen permeability is measured at 23 ° C and a relative humidity of 50% with a Mocon OX-Tran 2/21 measuring device. The water vapor permeability is determined at 37.5 ° C and a relative humidity of 90%.

thickness

The thickness of an adhesive layer can be determined by determining the thickness of a section defined in terms of its length and width of such an adhesive layer applied to a carrier or liner, minus the (known or separately ascertainable) thickness of a section of the same dimensions of the carrier or liner used. The thickness of the adhesive layer can be determined using commercially available thickness measuring devices (probe test devices) with an accuracy of less than 1 μm. If fluctuations in thickness are found, the mean value of measurements is given at at least three representative points, that is to say in particular not measured at kinks, folds, specks and the like.

Like the thickness of an adhesive layer, the thickness of a pressure-sensitive adhesive strip or a carrier layer can also be determined using commercially available thickness measuring devices (probe test devices) with an accuracy of less than 1 μm. If fluctuations in thickness are found, the mean value of measurements is given at at least three representative points, that is to say in particular not measured at kinks, folds, specks and the like.

Claims

1. Double-sided pressure-sensitive adhesive strip, in which at least one conductive component connects the two opposite surfaces of the pressure-sensitive adhesive strip provided for bonding in the z-direction.

2. Double-sided pressure-sensitive adhesive strip according to claim 1, characterized in that at least two conductive components, such as in particular precisely two conductive components, connect the two opposite surfaces of the pressure-sensitive adhesive strip provided for bonding.

3. Double-sided pressure-sensitive adhesive strip according to claim 1 or claim 2, characterized in that the conductive components are insulated or uninsulated cables, in particular copper cables.

4. Double-sided pressure-sensitive adhesive strip according to claim 3, characterized in that the cables are flat cables.

5. Double-sided pressure-sensitive adhesive strip according to claim 3, characterized in that the cables are round.

6. Double-sided pressure-sensitive adhesive strip according to one of the preceding claims, characterized in that the conductive components are metal foils, such as in particular copper foils.

7. Double-sided pressure-sensitive adhesive strip according to one of the preceding claims, characterized in that the conductive components are turned over around the edges of the pressure-sensitive adhesive strip.

8. Double-sided pressure-sensitive adhesive strip according to one of the preceding claims, characterized in that the conductive components are passed through the pressure-sensitive adhesive strip in the z-direction.

9. Double-sided pressure-sensitive adhesive strip according to one of the preceding claims, characterized in that the pressure-sensitive adhesive strip has at least one pressure-sensitive adhesive layer based on (a) poly (meth) acrylate, (b) synthetic rubber such as, in particular, vinyl aromatic block copolymer or (c) a blend of poly (meth) acrylate and synthetic rubber such as vinyl aromatic block copolymer.

10. Double-sided pressure-sensitive adhesive strip according to one of the preceding claims, characterized in that the pressure-sensitive adhesive strip contains at least one foamed, typically viscoelastic, intermediate carrier layer and / or at least one foamed pressure-sensitive adhesive layer, the layer preferably being foamed with microballoons.

11th Double-sided pressure-sensitive adhesive strip according to one of the preceding claims, characterized in that the pressure-sensitive adhesive strip contains at least one pressure-sensitive adhesive layer based on synthetic rubber, such as in particular vinyl aromatic block copolymer, the pressure-sensitive adhesive layer having a water vapor permeability (WVTR) of less than 100 g / (m ^{2 *} d), preferably less than 50 g / (m ^{2 *} d), more preferably less than 40 g / (m ^{2 *} d), even more preferably less than 30 g / (m ^{2 *} d) and in particular less than 20 g / (m ^{2 *} d) .

12. Component with power lines and / or contacts to which a pressure-sensitive adhesive strip according to one of claims 1 to 11 is glued, the power lines and / or contacts of the component being in contact with the conductive components of the pressure-sensitive adhesive strip.

13. Composite of a first component with contacts and / or power lines and a consumer with contacts and / or power lines as a further component, the two components being glued by means of a pressure-sensitive adhesive strip according to one of claims 1 to 11, the contacts and / or power lines of the first component and of the further component are each in contact with the conductive components of the pressure-sensitive adhesive strip.

14. Use of a pressure-sensitive adhesive strip according to one of claims 1 to 11 for bonding (a) a first component with contacts and / or power lines with (b) a Consumers with contacts and / or power lines as a further component, the contacts and / or power lines of the first component and of the further component being in contact with the conductive components of the pressure-sensitive adhesive strip.

15. Use according to claim 14 in an automobile, in a particularly portable electronic device, in the construction industry or in DIY.