EP1250392A1

EP1250392A1 - Transfer adhesive tape

Info

Publication number: EP1250392A1
Application number: EP00987354A
Authority: EP
Inventors: Ralf RÖNISCH
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 1999-12-15
Filing date: 2000-12-06
Publication date: 2002-10-23
Also published as: WO2001044397A1; DE10060531A1

Abstract

The invention relates to a transfer adhesive tape, which comprises a non-adhesive support tape and at least one layer of pressure-sensitive adhesive material, applied to the support tape and which may be detached from said support tape. The transfer adhesive tape is in rolled form and the layer of pressure-sensitive adhesive material is non-continuous. During use a clean separation of the layer of adhesive, attached to the substrate, from the layer remaining on the support tape is achieved.

Description

transfer tape

The invention relates to a transfer adhesive tape which comprises a carrier tape and at least one layer of pressure-sensitive adhesive applied thereon and removable from the carrier tape.

A variety of such tapes are known. They serve to apply a pressure sensitive adhesive film to a substrate to be bonded, the adhesive film detaching from the carrier tape. If the desired length of the film is applied to the substrate, this part of the film should separate cleanly from the film still adhering to the carrier tape, without an irregular tear-off edge being formed or the adhesive film pulling threads which, when torn, onto the substrate, the carrier tape or the Fold back the device containing the carrier tape and soil it.

This requirement could generally be met by using a relatively soft pressure sensitive adhesive that tears off relatively quickly due to low cohesion. The disadvantage here, however, is the behavior with only a slight increase in the usual ambient temperature. Then the adhesive begins to flow and spreads beyond the intended area. In addition, low cohesion results in low shear strength, which can lead to problems with many requirements. In addition, the adhesive then undesirably penetrates too much into the substrate, e.g. B. paper, and in some cases even strikes down to the back of the substrate.

Transfer adhesive tapes of the type mentioned at the outset are known, for example, from European patent specification EP 0 543 184 B1 or the corresponding German patent application DE 41 37 936 A1 or German patent DE 39 25 130 C2. In the private and office sector, such transfer strips are often used with hand-held devices for application to the substrate, in particular paper. Many different hand-held devices are known, the device according to EP 0 267 396 B2, for example, to be mentioned here. The devices can be used as single-use devices or as devices an interchangeable cassette can be used, which contains the transfer tape wound on a spool and a take-up spool for receiving the carrier tape separated from the adhesive film. Such a hand-held device with an exchangeable cassette is described, for example, in DE 36 44 946 C2.

Furthermore, flexible sheet-like structures which can be removed again without leaving any residue and which are used in particular for self-adhesive labels are known from EP 0 596 418 B1. Here the pressure sensitive adhesive is designed as a hot melt adhesive, which is applied in a grid-like manner and has a base adhering to the substrate. The hotmelt adhesive is not present in a carrier system during coating. The ratio of the base area of a hot melt adhesive point to the height of the hot melt adhesive point is in the range from 5: 1 to 30: 1. The residue-free releasability from a siliconized backing paper is excluded.

A variety of other uses beyond the self-adhesive labels are mentioned in this document, including transfer tapes. However, it is not known from this document that these transfer ribbons are in rolled up form.

The invention has for its object to achieve a regular, clean and at the desired location separation of the adhesive film already adhering to the substrate from the adhesive film on the carrier tape in a transfer adhesive tape of the type mentioned, the adhesive disadvantages of an adhesive with low cohesion should be avoided.

This object is achieved according to the invention in the case of the transfer adhesive tape of the type mentioned at the outset by the transfer adhesive tape being in rolled up form and the layer of pressure-sensitive adhesive being discontinuous.

According to the invention, the separation of the adhesive film at the desired, defined location is achieved, on the one hand, by the transfer adhesive tape being provided for use in unwinding devices or, if it is used without these devices, already being in a rolled-up form, so that the curvature which results from this Separation of the adhesive film already adhering to the substrate is facilitated from the rest of the adhesive film. In particular, it will clean tear off of the adhesive film achieved by the property of the layer being discontinuous. The word "discontinuous" means that this is a layer which does not have the same thickness and the same composition at every point as is known in the case of the customary transfer adhesive tapes. The irregularity of the layer in accordance with the invention weakens it in certain places, so that the adhesive film tears off particularly easily here, provided that it is a coherent layer of adhesive. According to the invention, however, it can also be an adhesive layer consisting of a large number of non-contiguous surfaces, different patterns being possible. An example, which is particularly preferred, consists of a grid-shaped layer with a large number of adhesive points.

It is therefore proposed, on the one hand, that the adhesive layer consists of a large number of non-contiguous surfaces. The terms contiguous and non-contiguous surfaces are used in the sense of the mathematical topology. The clean tear off of the adhesive layer results from the separation of the layer between the non-contiguous surfaces. The non-contiguous surfaces can have a circular shape and, in particular, be point-shaped. The surfaces can also have the shape of polygons, especially rectangles. In both cases it is also suggested that the non-contiguous surfaces form a regular pattern.

Alternatively, it can also be provided that the adhesive layer is a coherent layer with weakened areas. The weakened areas can be designed as partial areas without adhesive, so that the weakening is brought about by the narrow webs between the larger adhesive areas. Alternatively, the weakened areas can also be designed as partial areas with a reduced layer thickness. The adhesive film is then preferably torn off in the areas of reduced layer thickness. The thickness of the layer in the weakened areas is preferably from 0% to 90% of the maximum layer thickness.

It is also proposed that the maximum thickness of the adhesive layer is 5 to 500 μm. This information applies to all different configurations of the adhesive layer of the transfer adhesive tape according to the invention. According to the invention, individual, mutually insulated adhesive areas can be provided on the carrier tape. However, the adhesive layer can also have an uneven thickness, so that "mountains" and "thaler" form. The elongation at break in the "valley" should be considerably lower than in a " Berg "The individual adhesive points or the" mountains "can be arranged in a grid pattern in a uniform grid, it also being possible for the individual points to form a superordinate pattern, as is proposed, for example, in the Swiss patent specification CH 673 078 A5

The adhesive force can be controlled by the distance and the shape of the individual adhesive points

For transfer adhesive tapes intended for end users, the following applies in particular: The grid-shaped and preferably punctiform application of the hot melt adhesive forms a dome-shaped adhesive point, the base of which is connected to the carrier tape.A particularly high adhesive force and yet residue-free releasability, regardless of the release angle and speed can be obtained if a ratio of the base area of a hot-melt adhesive point to its height in the range from 5 1 to 30 1 and preferably 10 1 to 25 1 is maintained. The procedure according to the invention results in an adhesive force of, for example, 2.5 to 10 N / 25 mm reached

As has already been explained, the geometric shape of the grid can be different. The grid can also be composed not only of dots, but also of any surface, for example rectangles similar to a chocolate bar or of diamonds. The pattern also need not be uniform also have adhesive areas with different adhesive strengths. Thus, a plurality of adhesive layers can lie side by side and / or one above the other, at least one adhesive layer being discontinuous in the sense of this invention About the pressure sensitive adhesive used

The term “pressure-sensitive adhesive” mentioned above generally means a permanent adhesive, which can be different types of adhesive, namely in particular a hot melt adhesive, a dispersion adhesive, a solvent-based adhesive or an adhesive to be applied as a paste to the carrier tape.

To the hot melt adhesive

If it is a pressure sensitive hot melt adhesive, it is not dispersed or emulsified and is therefore not used in the form of a dispersion, emulsion, organosol or plastisol for the coating. However, the hot melt adhesive as such may contain additives, e.g. B. plasticizers, stabilizers or similar substances.

The hot melt adhesives which can be used according to the invention include, for example:

a) thermoplastic backbone polymers; b) adhesive resins if necessary; c) if necessary plasticizers; d) optionally viscosity-reducing agents; e) stabilizers if necessary; f) optionally fillers and g) optionally photo initiators.

All thermoplastic polymers (a) and their mixtures with components (b) to (g) can be used here.

Suitable thermoplastic backbone polymers are e.g. B. natural rubber; synthetic rubber such as SBS, SIS, SEBS (styrene / ethylene / butadiene / styrene), SEPS (styrene / ethylene / propylene / styrene) (triblock copolymers) and SB, Sl, S-EP (diblock copolymers); Polyolefins such as atactic PP, ethylene-propylene-butadiene copolymer; epoxidized polyolefin, polyacrylates such as polybutyl acrylic acid ester, poly (2-ethylhexyl acrylic acid ester), polymethacrylic acid ester and their copolymers with e.g. As acrylic acid, methacrylic acid, vinyl acetate, maleic anhydride, diacetone acrylamide or acrylonitrile; Polyvinyl derivatives such as Ethylene-vinyl acetate copolymer, (1-vinyl-2-pyrroleon) -vinyl acetate copolymer,

Vinyl acetate-vinyl laurate copolymer, polyamides such as diethylenetriamine polyamide, copolyamides, polyesters, copolyesters, copolyether esters, polyurethanes, silicones. These backbone polymers can be used as copolyme sates or as mixtures with one another, completely crosslinked or UV or ESH postcrosslinkable

Suitable adhesive resins are, for example, aliphatic, alicyclic and aromatic hydrocarbons, polyterpenes, rosin esters such as rosin-glycene esters, hydrogenated rosin-pentaerythrate esters, polymerized rosin-diethylene glycol esters, polymerized rosin

Suitable plasticizers are, for example, phthalates such as diethyl phthalate, dioctyl phthalate, dnsodecyl phthalate, phosphates such as tributyl phosphate, triphenyl phosphate, dioctyl adipate, dioctyl sebacate and dibutyl maleate

Suitable viscosity-reducing additives are, for example, aliphatic, alicyclic and aromatic hydrocarbons, liquid polybutene, liquid polystyrene, xylene-formaldehyde resins, coumarone-indene resins or reactive thinners such as, for example, ethoxyethoxyacrylates

Suitable stabilizers are, for example, tetrakis [methylene-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate] methane, 1, 3,5-trimethyl-2,4,6-tπs (3, 5-dι-tert-butyl-4-hydroxy-benzyl) benzene, 4,4'-thιobιs (6-tert-butyl-m-cresol), Zmk-dibutyldithiocarbamate, dibutylthiourea, octylphenylsacylate, 2-hydroxy-4- ( 2-hydroxy-3-methacryloxy) propιobenzophenone, octa-decyl-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate

Suitable fillers are, for example, mineral substances such as kaolin, talc or titanium dioxide

Preferred hot melt adhesives are those which contain photosensitizers and whose thermoplastic backbone polymers can be crosslinked by radiation, for example by UV or electron radiation. Suitable thermoplastic backbone polymers are, for example, acrylates, polyester acrylates, synthetic rubbers, polyurethanes -nachvernetzbaren Hot melt adhesives are characterized by the radiation-crosslinkable hot melt adhesives with a noticeably higher temperature resistance. After the radiation crosslinking, the hotmelt adhesive preferably has a melting range of 120 to 250 ° C. and a softening range of 50 to 180 ° C.

Hot melt adhesives with a viscosity of approximately 1000 to 80,000 mPas at a processing temperature of 60 to 180 ° C. are preferred.

The amount of adhesive is less than that of a conventional full-area or uniform application and is 1 to 500 g / m ² , preferably 40 to 100 g / m ^2. The application of the hot-melt adhesive to the carrier tape can be in a dot pattern of 100 to 22500 points / 625 mm ^, particularly preferably from 1600 to 10000 points / 625 mm ² .

A surface coverage of 10 to 100%, in particular 30 to 60%, is preferred for the hot-melt adhesive.

To the dispersion pressure sensitive adhesive

As already mentioned, the pressure-sensitive adhesive layer can consist of commercially available pressure-sensitive adhesives. These are elastic and permanently adhesive self-adhesive compositions with great adhesive forces that adhere immediately to the various surfaces even under low pressure at room temperature.

They can be applied to the carrier tape in aqueous dispersion.

Among pressure-sensitive adhesives of this type, those based on acrylate are particularly advantageous. This term is to be understood as far as possible. So it can be a polyacrylate, a polymethacrylate, but also suitable acrylate or methacrylate copolymers. Products of this type are described, for example, in Römpps Chemie-Lexikon, Vol. 5, p. 3274, namely polyacrylates, a polymethacrylate, copolymers of acrylic and methacrylic esters, such as, for example, with styrene, vinyl chloride, vinyl acetate, acrylonitrile. Copolymers based on acrylate methacrylate are also suitable. Preferred acrylate materials are copolymers of methyl methacrylate with butyl acrylate. Suitable pressure sensitive adhesives are also those based on (meth) acrylic esters with alkyl radicals from C4 to C-J2-

In addition, however, small proportions of (meth) -acrylic acid esters with alkyl residues from C ^ to C3 or C-13 to C- | 8 may be included. In addition, small proportions (about 0-12% by weight) of (meth) acrylic acid and / or other copolymerizable acids, such as maleic acid, fumaric acid, itaconic acid, can be copolymerized. To increase the cohesion and improve the stability of the dispersion, proportions of acrylonitrile or acrylamides and crosslinking additives, for. B. N-methylolacrylamide or glycidyl methacrylate in conjunction with hydroxyl-bearing (meth) acrylic esters or polyfunctional acrylic esters, e.g. B. butanediol bis-acrylate can be used. Finally, some of the (meth) acrylic esters can be replaced by copolymerizable compounds, such as vinyl acetate or vinyl propionate.

The well-known technical printing methods of the screen printing or gravure printing type, which are known per se, are eminently suitable for the production of pressure-sensitive spherical caps, with dispersions having a high solids content, preferably concentrated, thixotropic, aqueous pressure-sensitive adhesive dispersions being used as pressure-sensitive adhesives. Aqueous dispersions are preferred, but dispersions of the organosol type can also be used, that is to say those based on a high-boiling organic non-solvent, or also those of the plastisols, such as pasty products made from plasticizer plus plastic. Aqueous dispersions preferably have a solids content of at least 45% by weight, especially about 55-69% by weight.

The starting materials can be dispersions based on rubber, polyacrylates, polyvinyl ethers or polyvinyl isobutylene. Commercial materials based on polyacrylates are preferred. Suitable commercial products are Ucecryl 913 and Ucecryl PC 80 (sold by ucb, Arzneimittelbos, Belgium) and the plastic dispersion VP 859/6 (sold by Freihoff). The pressure-sensitive adhesive to be applied, which is initially present in an aqueous medium, preferably contains wetting agents or surfactants (sold under the trade name Byk W). The dispersions of the Pressure-sensitive adhesives for forming the pressure-sensitive adhesive layer are preferably applied to the carrier tape in an amount of about 1 to i> g / m ² and very particularly preferably in an amount of about 2 to 4 g / m ² .

To the carrier tape

The carrier tape, which is anti-adhesive to reduce the adhesive tension between it and the pressure-sensitive adhesive layer, can consist of a plastic film, as is usually used for the carriers of typewriter tapes, for. B. from polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride or polycarbonate. Silicone-coated paper has also proven to be suitable. The silicone coating leads to a reduction in the mentioned adhesive tension. It can be replaced by other non-stick agents such as polytetrafluoroethylene. The carrier tape preferably has a thickness of approximately 10 to 100 μm, in particular approximately 15 to 55 μm.

Furthermore, the carrier tape can consist of a metal foil coated with silicone or wax or a corresponding textile tape. In the latter case, a textile tape which is stretchable transversely to the running direction but not in the direction of the running direction is advantageous as a carrier tape. The stretchability allows the carrier tape and thus the adhesive layer to be adapted to non-flat surfaces. A problem-free detachment of the adhesive layer from the carrier tape is still guaranteed, since the carrier tape should not be stretchable in the running direction or only to a minor extent. An example of a corresponding application is the gluing of soles in the shoe industry, the invention, despite the uneven sole surface, enabling both a clean tear-off or circumferential tear-off of the adhesive film and a uniform application of the adhesive film. It is also advantageous if the carrier tape is wider than the substrate to be glued.

A range of 5 mm to 1 m is proposed for the width of the carrier tape. The most favorable width then results from the corresponding intended use. To the applicator for the rolled up transfer tape according to the invention

When using the transfer adhesive tape according to the invention, use is advantageously made of applicators which enable the adhesive layer to be rolled off while the used carrier tape is being drawn in at the same time. This leads to particularly easy handling of the transfer adhesive tape according to the invention.

The application devices can be commercially available hand-held devices. A so-called "hand roller" can be used as a hand-held device that is particularly suitable for this purpose, in which a supply spool with the transfer adhesive tape is provided within a housing that is designed to be easy to grip, from which it is guided over an application foot protruding from the housing and from there again onto a winding spool the housing is returned. A suitable gear between the two coils in the housing ensures that the carrier tape is always sufficiently tensioned.

The user takes the housing in his hand for use and presses the outer and removable adhesive layer running over its end edge against the substrate to which it is to be transferred, e.g. B. a sheet of paper. During pressing, the user moves the device relative to the substrate and thereby transfers a layer of the pressure-sensitive adhesive to the substrate, the carrier tape being unwound from the supply reel and wound onto the take-up reel.

For industrial use, a machine applicator can be used instead of the hand-held device mentioned, which is capable of processing correspondingly larger widths of the transfer adhesive tape. It is generally proposed that the length of the transfer adhesive tape be 5 to 100 m, in particular 5 to 25 m.

For the production of the transfer adhesive tape according to the invention

The production of a transfer adhesive tape according to the invention coated with a hot melt adhesive is described below by way of example, it being possible to proceed analogously when using pasty adhesive or dispersion adhesive. The carrier tape is coated with a hot melt adhesive by a screen printing process, a gravure printing process or a flexographic printing process. A flat screen or a circular screen can be used for the screen printing process. Three-roll processes are used for flexographic printing, with the rolls being heated. It is also possible to use doctor blades instead of squeeze rollers. In the case of the gravure printing process, the pure well-doctor blade systems or well-roller systems can be used. The application systems can be closed or open systems. All these methods have in common that the carrier tape, which is to be coated with the hot-melt adhesive, is carried out between a counter-pressure roller and the pressure body which applies the adhesive. The dot frequency and the size of the hot-melt adhesive dots can be controlled by a variable, separate printing body or either directly through the screen for screen printing, the cup roller for gravure printing or the anilox roller for flexographic printing.

The hotmelt adhesive is applied in pure form, the hotmelt adhesive as such being able to contain the additives mentioned above and, if appropriate, being able to be crosslinked by UV or electron radiation. The application amount is 5 to 100 g / m ² , preferably 20 to 50 g / m ² .

If the adhesive layer has the geometric shape of a dot matrix, the ratio of the base area to the point height of the hot-melt adhesive points depends on the one hand on the rheological properties such as B. from the intrinsic viscosity, thixotropy and the flowability of the hot melt adhesive used. On the other hand, the said ratio of base area to point height z. B. when using a sieve by the ratio of hole diameter to wall thickness of the sieve used.

According to the invention, the hot melt adhesive can preferably be applied using a rotary screen printing system. The advantageous ratio of base area to point height can be set particularly favorably if the screen used in the rotary screen printing system has a wall thickness of 85 to 170 μm and a passage for the hot melt adhesive of approximately 10 to 45%. A screen with 1600 to 10000 holes / 625 mm ² is preferably used. When using such a screen, it is also advantageous if the counter-pressure roller used in the system is provided with a thermal control is. The necessary temperature of the counterpressure roller results, among other things, from the softening and melting range of the hot melt adhesive used, the production speed and the adhesive strength of the hot melt adhesive to the screen, depending on the temperature and the viscosity of the hot melt adhesive. A melting range from 80 to 250 ° C. and a softening range from 30 to 180 ° C. are preferred.

With the aid of the parameters mentioned, it is possible to apply the hot-melt adhesive to the substrate in a particularly favorable manner, it being possible in particular to set the ratio of base area to point height.

Use of the transfer adhesive tape according to the invention

The transfer adhesive tape according to the invention can be used wherever adhesive bonding is desired. In particular, the transfer adhesive tape can be used

- for perfect binding of books,

- for the production of book covers,

- for packaging purposes, namely in particular for the production of corrugated cardboard,

- for laminating paper and cardboard,

- for the adhesive coating of paper and cardboard (production of labels),

- For the production of bags, bags and carrier bags, paper sacks and folding boxes, envelopes (upper flap rubber, lower flap closure), window gluing, self-adhesive rubber coating), for use in packaging machines, in which the packaging production, filling and closing of the packaging are combined in one system Manufacture of cigarettes (gluing the cigarette seam), for the production of composite films, for the gluing of cellophane, for the production of polyethylene sacks, for the labeling of glass and plastic,

- for gluing wood,

- for the production of shoes, in particular as an assembly aid for fixing the upper of the shoe to the sole before sewing, as an adhesive for the upper (inner glue) for gluing the upper and insole, for gluing the outsole to the upper,

- for gluing plastic, namely PVC hard (pipes, sheets and foils, foam), soft PVC foils, polystyrene, styrene-acrylonitrile copolymers, styrene Butadiene copolymers, polyolefins, polyamides, polymethacrylate, glass fiber reinforced plastics, polymer films and curable molding compounds as well as laminated materials,

- Bonding of elastomers, such as rubber to rubber, to fabric or to metal,

- Bonding of metals in aircraft construction, in vehicle construction, in lightweight construction, in bridge construction, in the electrical industry, in machine, device and tool construction, as a repair aid for car bodies and other objects, for bonding metals with foreign materials,

- the gluing of wall and ceiling coverings, such as paper coverings (wallpaper, woodchip fiber, etc.), textile coverings, plastic and metal foils, sheets made of polystyrene and polyurethane foam, soft fibers and rock wool, ceramics (wall tiles) and wood,

- for gluing floor coverings, namely linoleum, parquet, PVC coverings, industrial rubber coverings, carpets, tiles,

- for gluing in construction technology, especially in prefabricated buildings, and as assembly adhesive,

- for gluing textiles,

- as a flocking adhesive for binding short-staple textile fibers on a wide variety of substrates,

- for gluing glass,

- in the textile industry for the bonding of breathable fabrics which must not be completely blocked by the bonding,

- for the production of breathable plasters.

This information is not exhaustive and does not limit the invention to the applications mentioned.

embodiment

The invention is explained in more detail below using an example.

A double-sided siliconized paper, 60 g, wood-free, white, machine-smooth, provided as a carrier tape, is coated with a hot melt adhesive in a rotary screen printing system using a screen with a wall thickness of 130 μm, a passage of 10% and 1600 holes / 625 mm ² . The hot melt adhesive used is Technomelt Q 8717-21 (from 30% synthetic rubber based on SIS block copolymers and from 50% hydrocarbon resin and other additives) from Henkel. This hot melt adhesive has a melting point of 110 to 120 ° C. Its viscosity is approx. 40,000 mPas at 150 ° C.

At a production speed of 40 m / min and a temperature of the counter-pressure roller between 110 and 115 ° C, preferably 112 to 113 ° C, the carrier tape is coated in a grid-like manner. The amount of adhesive is 40 g / m ² . The ratio of the base area to the height of the hot-melt adhesive point is 20: 1. The transfer tape produced in this way, transferred to a 50 μm thin polyester film, has an adhesive force of 40 N / 25 mm on a steel plate, measured according to the PSTC test method PSTC-1 (Pressure Sensitive Tape Council).

In comparison to a full-area and evenly coated transfer adhesive tape, an immediate "tear" without any stretching of the adhesive film was found after applying the adhesive film or the adhesive halftone dots on paper and removing the transfer tape from the paper. In the case of a transfer tape with a full-surface and evenly applied pressure-sensitive adhesive layer, on the other hand, when the transfer adhesive tape was removed, adhesive threads with an elongation of about 2 cm were observed, which then tore off and lay partly on the paper and partly on the dispenser in a disordered manner.

In addition, substrates that have holes are not provided with adhesive over the entire surface, but selectively only in the areas that are also intended to receive the adhesive.

Claims

claims

1. Transfer adhesive tape which comprises an adhesive carrier tape and at least one layer of pressure-sensitive adhesive which is applied to it and can be removed from the carrier tape, characterized in that the transfer adhesive tape is in rolled up form and the layer of pressure-sensitive adhesive is discontinuous.

2. Transfer adhesive tape according to claim 1, characterized in that the adhesive layer consists of a plurality of non-contiguous surfaces.

3. Transfer adhesive tape according to claim 2, characterized in that the non-contiguous surfaces have a circular shape and in particular are point-shaped.

4. Transfer adhesive tape according to claim 2, characterized in that the non-contiguous surfaces have the shape of polygons, in particular rectangles.

5. Transfer adhesive tape according to one of claims 2 to 4, characterized in that the non-contiguous surfaces form a regular pattern.

6. Transfer adhesive tape according to claim 1, characterized in that the adhesive layer is a coherent layer with weakened areas.

7. transfer adhesive tape according to claim 6, characterized in that the weakened areas are formed as sub-areas without adhesive.

8. Transfer adhesive tape according to claim 6 or 7, characterized in that the weakened areas are formed as partial areas with a reduced layer thickness.

9. Transfer adhesive tape according to claim 8, characterized in that the thickness of the layer in the weakened areas is 0% to 90% of the maximum layer thickness.

10. Transfer adhesive tape according to one of the preceding claims, characterized in that the maximum thickness of the adhesive layer is 5 to 500 microns.