WO2008148721A1

WO2008148721A1 - Dihydrazide cross-linked water-based butadiene/acrylate copolymer dispersion adhesive mass, particularly for flexible film adhesive strips

Info

Publication number: WO2008148721A1
Application number: PCT/EP2008/056741
Authority: WO
Inventors: Manfred Spies; Basir Baqi
Original assignee: Tesa Se
Priority date: 2007-06-07
Filing date: 2008-06-02
Publication date: 2008-12-11
Also published as: DE102007026996A1

Abstract

The invention relates to adhesive masses based a dihydrazide cross-linked water-based butadiene/acrylate copolymer dispersion having a butadiene content greater than 30 wt.%, preferably greater than 55 wt.% relative to the total solid matter content of butadiene and acrylate, the dispersion being mixed with a resin dispersion and/or optionally an anti-aging agent dispersion.

Description

tesa AG Hamburg

description

Dihydrazide Crosslinked Water Based Butadiene / Acrylate Copolymer

Dispersion PSA, in particular for soft film adhesive tapes

The invention relates to a pressure-sensitive adhesive based on a butadiene / acrylate copolymer dispersion, which is particularly suitable for use on highly plasticized films.

The use of flexible film pressure-sensitive adhesive tapes based on support materials consisting of elastic flexible films, preferably flexible PVC, is known for cable bandages. The classical adhesive tape systems for cable bandaging applications are based essentially on natural rubber, polyacrylates and styrene block copolymers.

Natural rubber compounds have been favored in the past for reasons of cost, but the disadvantage is the poor aging resistance. The natural rubber compositions are usually used as a solution in an aliphatic solvent mixture for the

Coating used. Water-based natural rubber compounds based on

Centrifuge latex are also known. For the setting of the required adhesive properties, the addition of resins, fillers, anti-aging agents is essential. Crosslinking can be either chemically via added crosslinking agents or physically over, for example

Electron beam.

The use of polyacrylates as adhesives for cable bandaging tapes is also well known. In addition to solutions of polyacrylates were in the Polyacrylate dispersions have also been described which, after compounding with resin dispersions and other coagents, fulfill the requirements of a cable bandaging belt.

Synthetic rubbers based on styrene-butadiene or styrene block copolymers have also been described as adhesives for cable bandaging tapes. These are mainly solvent masses or 100% systems which, after blending with resins and other coagents, largely meet the requirements.

Butadiene / acrylate latexes have been used in the past for the preparation of adhesive or cohesive PSAs. For example, DE 100 33 716 A1 describes pressure-sensitive adhesives based on butadiene / acrylate latices with high butadiene content for packaging adhesive tapes or DE 101 01 333 A1 describes highly cohesive PSAs based on butadiene / acrylate latex with a high butadiene content for highly cohesive PSAs. In contrast to many acrylate dispersions, the addition of resin dispersions and anti-aging agent dispersions is also necessary here for setting the required adhesive properties.

The use of these adhesives in combination with a woven or nonwoven backing is relatively unproblematic due to the inert behavior of the backing material. However, the use of water-based butadiene / acrylate latices in combination with support materials containing significant amounts of plasticizer, far-reaching problems. Depending on the storage temperature, the plasticizers migrate into the adhesive and change the adhesive properties to a degree which severely impairs the functioning of the adhesive tape.

Dihydrazides are known as crosslinking agents for PSAs, in particular for water-based polyacrylates (see for example US 4,931,494 A, US 2006/247367 A1 or US 2004/143058 A1).

The object of the invention is to provide an adhesive composition based on a butadiene / acrylate copolymer dispersion which, in particular in an adhesive tape, that can be used for cable bandaging, can be used and does not show the described deficiencies or only to a minor extent.

This object is achieved by a pressure-sensitive adhesive, as characterized in more detail in the main claim. Advantageous embodiments of the PSA are described in the subclaims. Furthermore, the invention includes the use of this pressure-sensitive adhesive.

Accordingly, the invention relates to a pressure-sensitive adhesive based on a dihydrazidvernetzten water-based butadiene / acrylate copolymer dispersion having a butadiene content greater than 30 wt .-%, preferably greater than 55 wt .-% based on the

Total solids content of butadiene and acrylate, with a resin dispersion, preferably a hydrocarbon resin dispersion, and / or optionally one

Aging agent dispersion is mixed.

In all the aqueous dispersions mentioned below, the water content is 40 to 60 wt .-%, preferably 50 wt .-%.

Preferred dihydrazide compounds are dicarboxylic acid dihydrazides having preferably 2 to 10 C atoms of the general formula

OO

Examples which may be mentioned are oxalic acid dihydrazide, malonic dihydrazide,

Succinic dihydrazide, glutaric dihydrazide, adipic dihydrazide, sebacic dihydrazide, maleic dihydrazide, fumaric dihydrazide, itaconic dihydrazide and / or isophthalic dihydrazide.

Preferably, the dihydrazides used for crosslinking are aliphatic or aromatic dihydrazides, preferably water-soluble dihydrazides such as

O O

Il Il adipic dihydrazide or sebacic dihydrazide (H ₂ NHNC (CH ₂ ), CNHNH ₂ ^ Adipic dihydrazide or Sebacinsäuredihydrazid show sufficient water solubility, so that a use in combination with water-based scaffold polymers is particularly advantageous.

Dihydrazides of the present invention are available from, for example, Japan Hydrazine Company (Japan) or YuNn Chemicals Qidong (China).

More preferably, the proportion of dihydrazides used for crosslinking in the butadiene / acrylate dispersion prior to crosslinking between 0.2 wt .-% and 10 wt .-%, preferably 0.5 wt .-% and 5 wt .-%.

According to a further preferred embodiment of the invention, the butadiene / acrylate copolymer dispersion is a carboxylated butadiene / acrylate copolymer dispersion. Such carboxylated copolymers preferably contain, in particular, less than 10% by weight, preferably less than 5% by weight, based on the monomer content of a carboxyl-containing comonomer, in particular acrylic acid, in the copolymer.

Further preferably, the butadiene content in the butadiene / acrylate copolymer dispersion is 30 wt .-% to 95 wt .-%, particularly preferably 60 wt .-% to 85 wt .-%, each based on the total solids content of butadiene and acrylate.

Butadiene / acrylate dispersion types according to the invention having a butadiene content of greater than 30% by weight are obtainable, for example, from Dow.

Radiation-chemical crosslinking, in particular by electron beams (ESH), in contrast to many styrene block copolymers, is additionally possible owing to the sufficiently high molecular weight of the scaffold polymers.

As the resin component, both dispersions of synthetic resins and dispersions of natural resins, preferably hydrocarbon resin dispersions, can be used.

Preferably suitable include Hydrogenated polymers of dicyclopentadiene (for example Escorez 5300 series, Exxon Chemicals)

Hydrogenated polymers of preferably C ₈ and C ₉ aromatics (for example Regalite and Regalrez series, Eastman // Arkon P series, Arakawa), these can be formed by hydrogenation of polymers from pure aromatic streams or else by hydrogenation of polymers based on Mixtures of different aromatics arise

• partially hydrogenated polymers of C ₈ and C ₉ aromatics (for example Regalite and Regalrez series, Eastman / Arkon M, Arakawa) hydrogenated polyterpene resins (for example Clearon M, Yasuhara)

Hydrogenated C ₅ / C ₉ polymers (for example ECR-373, Exxon Chemicals)

Aromatic modified selectively hydrogenated dicyclopentadiene derivatives (e.g., Escorez 5600 series, Exxon Chemicals) and / or

Hydrogenated and partially hydrogenated rosin-based resins (for example, Foral, Foralyn, Eastman // Hydrogral, DRT)

Hydrocarbon resin dispersions are clearly to be preferred because of their high cohesion and non-polar character.

The melting point of the base resins is according to an advantageous embodiment of the invention in the range 50 to 120 ⁰ C, preferably 60 to 1 10 ⁰ C. Based on the

Total solids content of butadiene / acrylate copolymer and resin, the resin content is preferably in the range 5 wt .-% to 60 wt .-%, preferably 10 wt .-% to 40

Wt .-%. For targeted adjustment of the adhesive properties can also

Mixtures of different resins are used.

An overview of suitable resin dispersions can be found in Donatas Satas, Handbook of Pressure Sensitive Adhesive Technology, 2nd Edition Resin Dispersion by Anne Z.

Casey, pages 545 to 566.

Resin dispersions suitable according to the invention are obtainable, for example, from Eastman.

To improve the aging behavior, it is possible to add dispersions to customary anti-aging agents which are sufficiently known from the field of elastomers. The PSA according to the invention fulfills the requirements even without the addition of anti-aging agents, that is, free of anti-aging agents.

Suitable anti-aging agents are sterically hindered phenols and amines, phosphites and organic sulfides, preferably sterically hindered phenols, which are known, for example, under the trade name Irganox®.

N, N-di-2-naphthyl-p-phenylenediamine, 2,5-di- (t-amyl) -hydroquinone, trimethyldihydroquinoline polymer and 6-ethoxy-2,2,4-trimethyl-1 can be used as antioxidants in the form of antioxidants. 2-dihydroquinoline, 2,6-di-t-butyl-p-cresol, 2,2'-methylenebis (4-methyl-6-t-butylphenol), 4,4'-butylidenebis (3-methyl 6-t-butylphenol), 4,4'-thio-bis (3-methyl-6-t-butylphenol), stearyl-beta (3,5-di-t-butyl-4-hydroxyphenyl) propionate, tetrakis [methylene-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl) propionate] methane, 1, 3,5-trimethyl-2,4,6-tris (3,5-di-t -butyl-4-hydroxybenzyl) benzene and 1, 1, 3-tris (2-methyl-4-hydroxy-5-t-butylphenol) butane, dilauryl thiodipropionate, distearyl thiodipropionate,

Laurylstearylthiodipropionate and dimyristylthiodipropionate, triisodecylphosphite, diphenylisodecylphosphite, triphenylphosphite and trinonylphosphite, and N-salicyloyl-N'-aldehyde-hydrazine, N-salicyloyl-N'-acetylhydrazine, N, N'-diphenyloxamide and N, N'-di (2-hydroxyphenyl) oxamide Find use.

Furthermore, if desired, further additives for adjusting the product properties may be added, such as, for example, rubbers, fillers, soft resins, flame retardants, oils or emulsifiers, for example of the alkoxylated alkylphenol type. With these additives, for example, it is possible, when the PSA is used in an adhesive tape, to influence the unwinding properties thereof in the desired manner.

The pressure-sensitive adhesive of the invention also meets the requirements without the addition of additives, ie without additives.

Furthermore, the scope of the invention also encompasses an adhesive tape which is produced with the aid of the adhesive of the invention by applying the adhesive to one or both sides of the backing material over a full or partial area. The coating can also take the form of one or more strips in the longitudinal direction (machine direction), optionally in the transverse direction, but in particular it is full-surface.

Furthermore, the adhesives can be applied in the form of dot dots by screen printing, wherein the dots of adhesive can also be differently sized and / or differently distributed, by gravure printing in longitudinal and transverse directions, by screen printing or by flexographic printing.

The adhesive may be in dome form (made by screen printing) or in another pattern such as mesh, stripes, zigzag lines. Furthermore, it can also be sprayed on, for example, which results in a more or less irregular application pattern.

The adhesive application on the carrier material is according to an advantageous embodiment of the invention 5 to 120 g / m ² , preferably 15 to 40 g / m ² .

Suitable carrier materials for the invention are the films customary for cable bandaging applications based on polyolefins or PVC, with plasticizer contents between 20 and 60 phr.

The preferred carrier material is a woven fabric or a paper to which the adhesive is applied on one side.

Furthermore, the adhesive is preferably applied to a release paper, resulting in a strapless adhesive tape results, also called Fix for short.

As carrier material, it is possible to use all known textile carriers, such as a loop fabric, a velor, a scrim, a woven fabric, a knitted fabric, in particular a PET filament fabric or a polyamide fabric, or a nonwoven, wherein under "nonwoven" at least textile fabrics according to EN 29092 (1988) and stitchbonded nonwovens and similar systems are to be understood.

Also, lamination fabrics and knitted fabrics can be used. Spacer fabrics are mat-shaped laminates with a cover layer of a fibrous or filament nonwoven fabric, a backing layer, and individual or tufts of retaining fibers present between these layers which are needled through the particle layer and distributed over the surface of the laminate body Connect the top layer and the backing layer with each other. The holding fibers needled through the particle layer keep the cover layer and the underlayer spaced apart and are bonded to the cover layer and the underlayer. As nonwovens are particularly solid staple fiber webs, but also filament, meltblown and spun nonwovens in question, which are usually additionally solidify. As possible solidification methods for nonwovens mechanical, thermal and chemical solidification are known. If, in the case of mechanical consolidation, the fibers are held together purely mechanically by swirling of the individual fibers, by intermeshing fiber bundles or by sewing in additional threads, thermal or chemical methods can be used to bond adhesive (with binder) or cohesive (binder-free) fiber-fiber Achieve bonds. With suitable formulation and process control, these can be limited exclusively or at least predominantly to fiber nodes, so that a stable, three-dimensional network is formed while maintaining the loose, open structure in the nonwoven.

Nonwovens have proven to be particularly advantageous, which are solidified in particular by overmilling with separate threads or by intermeshing.

Such solidified nonwovens are produced, for example, on stitchbonding machines of the type "Malivlies" from Karl Mayer, formerly Malimo, and can be obtained, inter alia, from Naue Fasertechnik and Techtex GmbH A Malivlies is characterized in that a cross-fiber nonwoven is formed by forming stitches Fibers of the nonwoven is solidified.

As a carrier, a nonwoven type Kunitvlies or Multiknitvlies can also be used. A Kunitvlies is characterized in that it results from the processing of a longitudinally oriented nonwoven fabric to a fabric having on one side mesh and on the other mesh webs or Polfaser-folds, but has neither threads nor prefabricated fabrics. Such a nonwoven, for example, has also been produced for some time on Karl Mayer "Kunitvlies" stitchbonding machines characterized in that Fleece undergoes solidification by piercing both sides with needles both on the top and on the bottom.

Finally, sewing nonwovens are suitable as a precursor to form an adhesive tape. A stitchbonded web is formed from a nonwoven material having a plurality of seams running parallel to one another. These seams are created by sewing or stitching of continuous textile threads. For this type of nonwoven stitching machines of the type "Maliwatt" the company Karl Mayer, formerly Malimo, known.

Then the Caliweb® is perfectly suitable. The Caliweb® consists of a thermally fixed Multiknit spacer fabric with two outer mesh layers and an inner pile layer, which are arranged perpendicular to the mesh layers.

Also particularly advantageous is a staple fiber fleece which is preconsolidated by mechanical processing in the first step or which is a wet fleece which has been hydrodynamically laid, wherein between 2% and 50% of the fibers of the fleece are melt fibers, in particular between 5% and 40% of the fibers of the fleece.

Such a nonwoven fabric is characterized in that the fibers are wet-laid or, for example, a staple fiber fleece is preconsolidated by the formation of loops of fibers of the fleece or by needling, sewing or air and / or water jet machining. In a second step, the heat-setting takes place, wherein the strength of the nonwoven fabric is further increased by the melting or melting of the melt fibers. The solidification of the nonwoven backing can also be achieved without binders, for example by hot embossing with structured rolls, wherein properties such as strength, thickness, density, flexibility and the like can be determined by way of pressure, temperature, residence time and the embossing geometry. can be controlled.

As starting materials for the textile carrier in particular polyester, polypropylene, viscose or cotton fibers are provided. However, the present invention is not limited to the materials mentioned, but it can, recognizable to those skilled to work without having to be inventive, a variety of other fibers for the production of the web can be used. In particular, wear-resistant polymers such as polyesters, polyolefins, polyamides or glass or carbon fibers use. Also suitable as the carrier material are carriers made of paper (creped and / or uncreped), of a laminate, of a film (for example polyethylene, polypropylene, mono- or biaxially oriented polypropylene films, polyester, PA, PVC and other films ), or of sheet-like foams (for example, polyethylene and polyurethane).

On the coating side, the surfaces of the supports may be chemically or physically pretreated, as well as the back side of which may be subjected to an anti-adhesive physical treatment or coating.

Finally, the web-shaped carrier material can be a double-sided anti-adhesive coated material such as a release paper or a release film, also called liner.

It is particularly advantageous to use the PSA on flexible films preferably of the plasticizer-modified PVC type or of a plasticizer-containing olefin, with the plasticizer content preferably being between 20 and 60 phr.

These films are characterized by various advantages, which favors their use. • Manual and machine processing possible

• Short outline

• Good resistance to chemicals and to vehicle fluids

• Folds itself smoothly around all unevenness due to its high flexibility

• After assembly, favorable material properties, even at changing temperatures

• Excellent aging resistance

• Very good cold flexibility and cold resistance

• High temperature resistant

More preferably, the PSA can be used on said plasticizer-containing Poylolefin- or PVC films for the bandaging of cables.

Particularly advantageously, the adhesive tape can be used for the helical sheathing of an elongated material, such as, in particular, a cable set. After the pressure-sensitive adhesive has been coated on said soft-film carrier, a pressure-sensitive adhesive tape is obtained which fully meets the requirements of a soft-film pressure-sensitive adhesive tape for cable banding in terms of tack, bond strength, cohesion and unwinding properties.

Especially the combination of butadiene / acrylate copolymer dispersion with

Resin dispersions leads to an adhesive composition which is outstandingly suitable for flexible film adhesive tapes.

Contrary to expectations and surprising for the expert has the hydrazide crosslinking of

Pressure-sensitive adhesive with the consequence that the migration of plasticizers from the film is significantly restricted.

The hydrazide crosslinking impedes the migration of the plasticizer from the film and thus stabilizes the adhesive properties of the pressure-sensitive adhesive, in addition to the by reacting the present in the backbone polymer carboxyl groups

Hydrophilicity of the pressure-sensitive adhesive reduces, which increases the water sensitivity of a with the

Adhesive adhesive mass produced additional reduced.

Overall, the crosslinking systems previously known for pressure-sensitive adhesive dispersions, such as epoxides or isocyanates, do not lead to the expected success. Aziridines segregate due to toxicity, and metal chelates such as aluminum acetylacetonates often cause strong discoloration in the non-neutral region.

In the case of the use of the PSA in an adhesive tape used for cable bandaging with a film carrier is just stopping the migration of the plasticizer from the film, in the adhesive and in the sheath of the protected cable of very high practical importance. The adhesive properties of the adhesive are altered by migration of the plasticizers to an extent that precludes interaction with the substrate.

Usually, the plasticizers destroy the plastic sheath of the cables, which can lead to short circuits. In the worst case, this will result in a fire of the device or motor vehicle in which the cables are located. This is prevented according to the invention. In the following, the invention will be explained in more detail by way of examples, without any intention to limit the scope of the invention.

The peel strength (bond strength) is tested on the basis of PSTC-1. A 2 cm wide strip of the adhesive tape is glued to a ground steel plate as a test substrate by rolling it five times twice with a 5 kg roller. The plate is clamped, the adhesive strip pulled off over its free end on a tensile testing machine under a peel angle of 180 ° at a speed of 300 mm / min, and determines the necessary force. The measurement results are given in N / cm and averaged over three measurements. All measurements are carried out in an air-conditioned room at 23 ^° C. and 50% relative humidity.

Examples

example 1

A dispersion adhesive consisting of 50 parts by weight of a carboxylated butadiene / acrylate dispersion having a butadiene content of about 70% by weight (XZ 91964.00, butadiene / acrylate dispersion having a solids content of 50% by weight from Dow), 50 parts by weight of Tacolyn 5193 (hydrocarbon resin dispersion from Eastman), 1 part by weight of Irganox 1520 SE (4,6-bis (octylthiomethyl) -o-cresol) as an antioxidant and 2 parts by weight of sebacic dihydrazide is continuous with a wire bar coated with a layer thickness of 25 g / m ² on an equipped with a Polyacrylatvorstrich 85 micron thick soft PVC film. The data are based on the solids content.

Technical conditions:

Machine: Laboratory coating machine of width 30 cm

Commissioned by: Streichbalken

Carrier web speed: 3.0 m / min The coated material is then thermally dried.

Drying: Laboratory Dry Seeh rank 5 minutes: 105 ⁰ C

This is followed by a 24-hour conditioning at room temperature.

Storage:

The samples were glued and stored with uncoated substrate.

The adhesive forces were measured on steel.

As a second possibility, a rapid storage for 3 hours at 70 ⁰ C or as a third possibility, a storage of 4 weeks at room temperature.

Adhesive data:

Fresh value: bond strength / steel: 1, 1 N / cm

After storage 3 hours 70 ^° C.: bond strength / steel: 0.8 N / cm After storage 4 weeks room temperature: bond strength / steel: 0.8 N / cm

Example 2

A dispersion adhesive consisting of 50 parts by weight of a carboxylated butadiene / acrylate dispersion having a butadiene content of 70 wt .-% (XZ 91964.00, butadiene / acrylate dispersion having a solids content of 50 wt .-% of Dow), 50 wt . parts Tacolyn 5193 (hydrocarbon resin dispersion of Eastman), 1 part by weight of Irganox 1520SE and 1 parts by weight of adipic acid dihydrazide is continuously microns with a wire bar at a coating thickness of 25 g / m ² on one equipped with a Poyacrylatvorstrich 85 thick soft -PVC film coated. The data are based on the solids content.

Technical conditions: Machine: Laboratory coating machine of width 30 cm Commissioned by: Streichbalken

Carrier web speed: 3.0 m / min

The coated material is then thermally dried.

Drying: Laboratory Dry Seeh rank 5 minutes: 105 ⁰ C

This is followed by a 24-hour conditioning at room temperature.

Storage:

The samples were glued and stored with uncoated substrate.

The adhesive forces were measured on steel.

Adhesive data:

Fresh value: bond strength / steel: 1, 0 N / cm

After storage 3 hours 70 ^° C.: bond strength / steel: 0.8 N / cm

After storage for 4 weeks room temperature: bond strength / steel: 0.85 N / cm

Example 3

A dispersion adhesive consisting of 50 parts by weight of a carboxylated butadiene / acrylate dispersion having a butadiene content of 70 wt .-% (XZ 91964.00, butadiene / acrylate dispersion having a solids content of 50 wt .-% of Dow), 50 wt Parts Dermulsene DT (terpene phenolic resin dispersion from DRT), 1 part by weight of Irganox 1520SE and 1 part by weight of adipic dihydrazide are continuously applied with a wire bar with a layer thickness of 25 g / m ² on a with a Poyacrylatvorstrich equipped 85 micron thick soft PVC film coated. The data are based on the solids content.

Technical conditions: Machine: Laboratory coating machine of width 30 cm

Commissioned by: Streichbalken

Carrier web speed: 3.0 m / min

The coated material is then thermally dried.

Drying: Laboratory Dry Seeh rank 5 minutes: 105 ⁰ C

This is followed by a 24-hour conditioning at room temperature.

Storage:

The samples were glued and stored with uncoated substrate.

The adhesive forces were measured on steel.

Adhesive data:

Fresh value: bond strength / steel: 0.9 N / cm

After storage 3 hours 70 ^° C.: bond strength / steel: 0.6 N / cm

After storage 4 weeks room temperature: bond strength / steel: 0.6 N / cm

Claims

claims

1. pressure-sensitive adhesives based on a dihydrazidvernetzten water-based butadiene / acrylate copolymer dispersion having a butadiene content greater than 30 wt .-%, preferably greater than 55 wt .-% based on the total solids content of butadiene and

Acrylate with a resin dispersion and / or optionally one

Aging agent dispersion is mixed.

2. Pressure-sensitive adhesive according to claim 1, characterized in that the dihydrazides used for crosslinking aliphatic or aromatic

Dihydrazides are, preferably water-soluble dihydrazides such as adipic dihydrazide or Sebacinsäuredihydrazid.

3. Pressure-sensitive adhesive according to claim 1 or 2, characterized in that the proportion of dihydrazides used for crosslinking in the butadiene / acrylate dispersion prior to crosslinking between 0.2 wt .-% and 10 wt .-%, preferably 0.5 wt .-% and 5 wt .-% is.

4. Pressure-sensitive adhesive according to at least one of claims 1 to 3, characterized in that the PSA is physically crosslinked, in particular by electron beams.

5. PSA according to at least one of the preceding claims, characterized in that the PSA additives are added such as rubbers, fillers, soft resins, oils or emulsifiers.

6. A pressure-sensitive adhesive according to at least one of the preceding claims, characterized in that the butadiene / acrylate copolymer dispersion is of the carboxylated butadiene / acrylate copolymer dispersion type.

7. Pressure-sensitive adhesive according to at least one of the preceding claims, characterized in that the carboxylated butadiene / acrylate copolymer dispersion in particular below 10 wt .-%, preferably below 5 wt .-% based on the monomer content of a carboxyl-containing comonomer, in particular acrylic acid, in the copolymer.

8. Use of a pressure-sensitive adhesive according to at least one of the preceding claims on flexible films, preferably of the type of a plasticizer-modified PVC or of a plasticizer-containing olefin, more preferably with

Plasticizer levels between 20 and 60 phr.

9. Use of a pressure-sensitive adhesive according to at least one of the preceding claims on plasticizer-containing Poylolefin- or PVC films for the bandaging of cables.