Corrosion protection tape comprising at least four layers

Description

[0001] The invention relates to a corrosion protection tape comprising at least four layers, a method for applying a corrosion protection tape comprising at least four layers, a method for producing a corrosion protection tape comprising at least four layers and the use thereof.

[0002] Corrosion protection compositions and corrosion protection systems, for example for pipe systems such as pipelines, but also for other technical systems, are widely known from the state of the art.Thus, EP 0 421 607 A1 discloses a tape system for protecting tubular objects, comprising an inner wrap covering the surface of the object to be protected and an outer wrap arranged over the inner wrap, wherein the inner wrap comprises an impact-resistant layer having an adhesive layer on its inner surface and a layer on its outer surface, and wherein the outer wrap comprises a carrier layer having a layer on at least one of its surfaces, wherein the inner wrap and the outer wrap enclose heat-fusible material, wherein the tape system is applied to the tubular object such that upon heating and cooling, the outer wrap is heat-fused to the inner wrap, thereby forming a completely closed protective coating.The tape system disclosed therein is intended to achieve the objective of improving protection against destructive external forces by providing a continuous, seamless, protective tape system. One of the adhesive layers can be made of butyl rubber, for example. Ethylene vinyl acetate, ethylene methyl acrylate, and low-density polyethylene, for example, are used as heat-meltable materials. A problem with the tape system disclosed in EP 0 421 607 A1, particularly at elevated temperatures in coated pipe systems and technical installations of any kind, is the contact between, for example, the outside of a pipeline pipe and the adhesive layer, made of butyl rubber, for example, which can detach from the outside of the pipeline pipe and / or impair its mechanical properties.This is primarily due to depolymerization of the materials used, whether the heat-melting materials or the carrier layer. While it is possible to improve adhesion by using solvent-based primers or adhesion promoters, this is often insufficient, and above all, it has no effect on the mechanical properties of the coating itself. In particular, this system is only possible with increased labor and expense, as an inner and outer wrap must be provided, meaning at least two wraps must be applied.

[0003] Furthermore, the problem of leaks that can occur, allowing water to enter, is known from the state of the art in corrosion protection systems. Water can cause a particular type of corrosion known as spiral corrosion, particularly in pipes wrapped with overlapping tape systems, such as pipelines and similar tubular objects. To prevent such corrosion of the pipes, additional cathodic protection is therefore used. This protection is very effective against mechanical damage to the corrosion protection tape. Mechanical damage can be caused by the penetration of sharp objects such as rocks or similar, and can result in the tape losing its adhesion to the substrate, e.g., a pipeline. However, such leaks and corrosion can also arise due to aging of the corrosion protection tape material.Cathodic protection applies an electric current to the pipe, providing enough electrons to prevent corrosion. The pH value in the area surrounding the damage rises to alkaline, thus protecting the defective region. However, this cathodic protection cannot prevent corrosion along the spiral, as there are no conductive elements between the tape and the pipe in the overlap area to carry the current. It is therefore important to provide a tape system with sufficient mechanical strength for corrosion protection. This is usually achieved by additionally wrapping it with a protective tape to prevent damage to the tape system and thus prevent corrosion. This, in turn, increases the cost due to the additional work step of wrapping it with a protective tape.

[0004] A fundamental disadvantage of the known tape systems is that at least two wraps with a tape must be made in order to provide sufficient protection against mechanical damage and thus achieve a sufficient corrosion protection effect.

[0005] EP 3 412 720 A1 discloses a two-layer or multi-layer corrosion protection tape comprising a corrosion protection composition comprising at least a first butyl rubber having an apparent Brookfield viscosity at 66°C according to DIN EN ISO 2555 in a range from about 400,000 mPa s to about 2,000,000 mPa s and an average molecular weight in a range from about 20,000 g / mol to about 60,000 g / mol and at least a second butyl rubber having an average molecular weight in a range from about 150,000 g / mol to about 2,000,000 g / mol and a Mooney viscosity ML (1+8) at 125°C in a range from about 25 MU to about 65 MU, measured according to ISO 289.

[0006] US 2019 / 249039 A1 discloses an adhesion-promoting composition for a corrosion protection product, the composition comprising - about 20 wt.% to about 70 wt.% of at least one polyolefin selected from a group comprising polyethylenes and / or polypropylenes; - about 20 wt.% to about 65 wt.% of at least one butyl rubber; and - about 6 wt.% to about 35 wt.% of at least one elastomer selected from a group comprising ethylene-propylene rubber and / or ethylene-propylene-diene rubber; in each case based on the total amount of the adhesion-promoting composition.

[0007] US 2018 / 305556 A1 discloses a corrosion protection composition comprising at least a first polyisobutylene having a Staudinger index J 0 in a range from about 15 cm 3 / g to about 98 cm 3 / g and an average relative molar mass (formula A) in a range from about 32,000 g / mol to about 280,000 g / mol and at least a second polyisobutylene having a Staudinger index J 0 in a range from about 105 cm 3 / g to about 238 cm 3 / g and an average relative molar mass (formula A) in a range from about 350,000 g / mol to about 900,000 g / mol.

[0008] WO 2020 / 229600 A1 discloses a corrosion protection tape for a metal pipe (or a metal pipe fitting). The tape has an inner band made of glass fibers comprising a viscoelastic thermoplastic corrosion protection material. The tape has an outer band made of glass fibers impregnated with an adhesive. The inner band can be wrapped around the metal pipe, with the viscoelastic thermoplastic corrosion protection material carried by the inner band abutting and covering an outer surface of the metal pipe. The outer band is wrapped around the inner band, and the adhesive impregnated in the outer band penetrates the inner band, thereby bonding the outer band to the inner band.

[0009] CN 207 349 693 U discloses a corrosion protection tape for marine bio-resistant steel pipes, the tapes being composites comprising at least a cold fluidized polymer layer, a layer braided from polyester fibers, a water-blocking rubber layer and a polyethylene film layer in close contact with each other.

[0010] CN 101 935 500 A discloses an anti-corrosive viscoelastic body rubber belt comprising a protective film layer, a first viscoelastic body rubber belt, a reinforced network layer, a second viscoelastic body rubber layer and a release film layer arranged successively.

[0011] The object of the present invention is to provide a corrosion protection tape that, above all, eliminates the need for a second step in the application of a protective tape to pipes, pipelines, tubular objects, pipelines, pipeline components, and the like. Furthermore, the object of the present invention is to design a corrosion protection tape that can be functionalized so that it can exhibit additional properties.

[0012] This object is achieved by a corrosion protection tape comprising at least four layers, wherein at least two layers of the corrosion protection tape comprise an at least single-layer carrier as carrier layers, wherein at least one layer of the carrier is designed as a support layer, wherein at least one further layer of the corrosion protection tape is designed as a connecting layer and comprises at least one connecting layer, wherein the connecting layer comprises a material comprising at least one butyl rubber and / or at least one polyisobutylene, wherein the at least one connecting layer is arranged between the two carrier layers, and wherein at least one further layer of the corrosion protection tape is designed as a corrosion protection layer and is arranged on at least one exposed surface of at least one carrier layer, wherein an adhesion-promoting layer is arranged on at least one surface of the support layer of at least one of the carrier layers,wherein the support layers of the at least two support layers are formed from a support material comprising at least one polyethylene, one polypropylene, one polyvinyl chloride, one thermoplastic elastomer and / or one metal.,

[0013] A corrosion protection tape within the meaning of the present invention serves in particular as a corrosion-protective coating, in particular a wrapping, of pipes, pipelines, tubular objects, pipes and pipe components, as well as for the corrosion protection of tanks and tank components, as well as other systems and fittings. The corrosion protection tape has an inner surface and an outer surface, with the outer surface opposite the inner surface. The inner surface lies adjacent to the component to be protected from corrosion. Furthermore, the corrosion protection tape has a length, a width, and a thickness. The length and the width each define opposite sides of the tape, with the length being assigned to the longer side, also called the longitudinal edge, of the tape.The thickness is a side of the strip arranged perpendicular to the surface and defines a distance between the inner surface and the outer surface. The corrosion protection strip preferably has a first longitudinal edge and a second longitudinal edge opposite the first longitudinal edge. In the end regions of the corrosion protection strip, end edges are arranged between the two first and second longitudinal edges ending there. The longitudinal edges define the longer side of the corrosion protection strip and thus the length of the strip. The length of the strip is preferably in a range between approximately 0.1 m and approximately 200 m, more preferably between approximately 1 m and approximately 140 m, even more preferably between approximately 5 m and approximately 70 m.

[0014] According to the invention, the corrosion protection tape has at least four layers. A layer defines an individual section of the corrosion protection tape that extends substantially completely over the entire surface of the corrosion protection tape. A single layer of the corrosion protection tape comprises a first surface and a second surface, wherein the second surface is opposite the first surface. The first or second surface of a layer is arranged substantially parallel to the inner / lower or outer / upper surface of the corrosion protection tape. Furthermore, a layer has a length, a width, and a thickness, like the corrosion protection tape itself. The length and the width each define opposite sides of the layer, wherein the length is assigned to the longer side of the layer. The thickness defines a distance between the first surface and the second surface of the respective layer.An arrangement of several layers is preferably carried out in the manner of a stack, wherein the arrangement is carried out by bringing the first or second surface of one layer into contact with the first or second surface of another layer. Several layers arranged on top of one another comprise a first outer layer, a second outer layer and at least one middle layer arranged between the first outer and the second outer layer. The surface of the first outer or the second outer layer, which are arranged opposite one another on a surface of a middle layer, is an exposed surface. The thicknesses of the individual layers add up to the thickness of the corrosion protection tape. A layer of the corrosion protection tape comprises at least one layer; preferably, a layer of the corrosion protection tape comprises at least two, more preferably several layers.According to the invention, the corrosion protection tape has at least four layers, preferably four, five, six, or seven layers. Within the meaning of the present invention, it is also possible for the corrosion protection tape to have more than seven layers.

[0015] The corrosion protection tape according to the invention is preferably stretched. It is also possible for only one layer, preferably a carrier layer, of the corrosion protection tape to be stretched.

[0016] According to the invention, the corrosion protection tape comprises at least two layers as carrier layers, which comprise at least a single-layer carrier. A carrier layer is defined as the layer that comprises a carrier of the corrosion protection tape. The corrosion protection tape comprises at least two layers as carrier layers. The corrosion protection tape preferably comprises exactly two layers as carrier layers. The corrosion protection tape can also have more than two carrier layers. According to the invention, the carrier is formed with at least one layer. Preferably, the carrier has at least one further, second layer. Preferably, the carrier has at least one further, third layer. According to the invention, the carrier can have more than three layers; it is preferably constructed with one layer, two layers, or three layers. One layer of the carrier comprises a first surface and a second surface, the second surface being opposite the first surface.The first or second surface of a layer of the carrier is arranged substantially parallel to the first or second surface of the carrier layer. According to the invention, at least one layer of the carrier is designed as a support layer. The support layer is defined as the layer that acts as a load-bearing layer in the carrier and can also impart stability to the corrosion protection strip. Preferably, a carrier layer has exactly one support layer. The support layer has a first surface and a second surface, wherein the first surface is opposite the second surface. The at least one further second layer and the at least one further third layer are arranged either on the first or the second surface of the support layer.The at least one further, third layer is preferably arranged on the respective other first or second surface of the support layer, opposite the at least one further, second layer, and thus such that the support layer is arranged between a second and a third layer. According to the invention, the support layers of the at least two carrier layers are formed from a carrier material comprising at least one polyethylene, one polypropylene, one polyvinyl chloride, one thermoplastic elastomer, and / or one metal. The support layers of the at least two carrier layers are preferably formed from the same carrier material.

[0017] Particularly preferably, the corrosion protection tape comprises at least four layers, wherein at least two layers of the corrosion protection tape comprise an at least single-layer carrier as carrier layers, wherein at least one layer of the carrier is designed as a support layer, wherein the support layer is formed from a carrier material comprising at least one polyethylene, a polypropylene, a polyvinyl chloride, a thermoplastic elastomer and / or a metal, wherein preferably the support layers of the at least two carrier layers are formed from the same or identical carrier material, wherein at least one further layer of the corrosion protection tape is designed as a connecting layer and comprises at least one connecting layer, wherein the connecting layer comprises a material comprising at least one butyl rubber and / or at least one polyisobutylene, wherein the at least one connecting layer is arranged between the at least two carrier layers,and wherein at least one further layer of the corrosion protection tape is designed as a corrosion protection layer, wherein the corrosion protection layer comprises a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein particularly preferably the corrosion protection layer and the connecting layer are formed from the same material, and the corrosion protection layer is arranged on at least one exposed surface of at least one carrier layer. Particularly preferably, in this embodiment, at least one electrically conductive material and / or core material can be present in the corrosion protection layer and / or the connecting layer. More preferably, the material of the connecting layer and the corrosion protection layer is identical. The at least one polyethylene that can be used as a carrier material is preferably selected from a group comprising high-density polyethylene (HDPE), medium-density polyethylene (MDPE),Low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-molecular-weight polyethylene (PE-HMW) and / or ultra-high-molecular-weight polyethylene (PE-UHMW), with particular preference being given to using at least one MDPE and / or at least one HDPE. An MDPE preferably has a density between approximately 0.926 g / cm 3 and approximately 0.939 g / cm 3 , and an HDPE between approximately 0.94 g / cm 3 and 0.97 g / cm 3 . The at least one polypropylene, which can also be used as a carrier material, is preferably selected from a group comprising isotactic polypropylene (iPP), syndiotactic polypropylene (sPP) and / or atactic polypropylene (aPP), with preference being given to selecting an isotactic polypropylene. The isotactic polypropylene is preferably selected from a group comprising homopolymers,Block copolymers and / or random copolymers. Ethene is preferably used as the copolymer. The at least one polyethylene and / or polypropylene can be used in the form of a masterbatch and, in particular, can contain a pigment additive. Pigments that can be added include, for example, carbon black or color pigments in an amount of about 0.5 wt.% to about 10 wt.%, more preferably in an amount ranging from about 1 wt.% to about 4 wt.%, based on the total amount of the base layer.

[0018] Polyvinyl chloride (PVC), which can also be used as a carrier material, is a specific thermoplastic polymer produced by chain polymerization from the monomer vinyl chloride. Polyvinyl chlorides are divided into rigid and flexible polyvinyl chloride. Flexible polyvinyl chloride contains plasticizers that result in the material's elastic behavior. Flexible polyvinyl chloride, for example, is a carrier material that can be used in the base layer. Thermoplastic elastomers, which can also be used as carrier materials, are polymers that behave similarly to classic elastomers at room temperature, but can be plastically deformed when heat is applied, thus exhibiting thermoplastic behavior. The at least one thermoplastic elastomer (TPE) is preferably selected from a group comprising thermoplastic styrene block copolymers (TPS-SEBS) and / or thermoplastic copolyester elastomers (TPC-ET).The basic molecular structure of TPS-SEBS is based on styrene-ethenebutene-styrene block copolymers, where the styrene blocks form the hard segments and the ethenebutene blocks form the soft segments. TPC-ET are copolyester-based TPEs with polyether soft segments. TPC-ET possess a certain resistance to higher temperatures (application range up to approximately 160 °C) and damage (high strength and toughness).

[0019] Preferably, a TPS-SEBS that can be used as a carrier material has one or more of the following parameters: a tear strength according to DIN 53504 (S2):2017-03 in a range from about 20 N / mm 2< to about 25 N / mm 2< in the longitudinal direction and in a range from about 20 N / mm 2< to about 25 N / mm 2< in the transverse direction, an elongation at break according to DIN 53504 (S2):2017-03 in a range from about 600% to about 700% in the longitudinal direction and in a range from about 650% to about 750% in the transverse direction, a stress at 50% elongation according to DIN 53504 (S2):2017-03 in a range from about 8 N / mm 2< to about 10 N / mm 2< in the longitudinal direction and in a range from about 8 N / mm 2< to about 10 N / mm 2< in the transverse direction and a density according to DIN EN ISO 1183-1:2013-04 in a range of about 0.8 g / cm 3< to about 0.95 g / cm 3<.Preferably, a TPC-ET that can be used as a carrier material has one or more of the following parameters: a tear strength according to DIN 53504 (S2):2017-03 in a range from about 10 N / mm 2< to about 20 N / mm 2< in the longitudinal direction and in a range from about 12 N / mm 2< to about 18 N / mm 2< in the transverse direction, an elongation at break according to DIN 53504 (S2):2017-03 in a range from about 450% to about 550% in the longitudinal direction and in a range from about 500% to about 650% in the transverse direction, a stress at 50% elongation according to DIN 53504 (S2):2017-03 in a range from about 4 N / mm 2< to about 14 N / mm 2< in the longitudinal direction and in a range from about 4 N / mm 2< to about 14 N / mm 2< in the transverse direction and a density according to DIN EN ISO 1183-1:2013-04 in a range of about 0.95 g / cm 3< to about 1.2 g / cm 3<.

[0020] If, within the scope of the invention, the term "approximately" or "substantially" is used in connection with values ​​or value ranges, or with properties or geometries, this is to be understood as a tolerance range that a person skilled in the art considers customary in this field. In particular, a tolerance range in connection with values ​​or value ranges when using the term "approximately" of ±20%, preferably of ±10%, and more preferably of ±5% is provided. Lower limits of value ranges can thus be undercut by 5% to 20%. Upper limits of value ranges can thus be exceeded by 5% to 20%. To the extent that different value ranges, for example preferred and more preferred value ranges, are specified in the present invention, the lower limits and upper limits of the various value ranges can be combined with one another.

[0021] According to the invention, at least one further layer of the corrosion protection tape is designed as a connecting layer, which preferably comprises at least one connecting layer. The connecting layer serves to connect the carrier layers to one another, but preferably also to enable the corrosion protection tape to be easily functionalized so that the corrosion protection tape has additional properties, such as a certain degree of conductivity. The connecting layer preferably comprises one or more connecting layers, more preferably one or two connecting layers.

[0022] According to the invention, the at least one connecting layer is made of a material comprising at least one butyl rubber and / or at least one polyisobutylene. Preferably, the at least one connecting layer comprises a material comprising at least one first, preferably depolymerized, butyl rubber with an apparent Brookfield viscosity at 66°C according to DIN EN ISO 2555: 2000-01 in a range from about 400,000 mPa s to about 2,000,000 mPa s and an average molecular weight MW (also called average molar mass or molecular mass) in a range from about 20,000 to about 60,000 and / or at least one first polyisobutylene with an average relative molar mass Mv in a range from about 14,000 g / mol, preferably from about 30,000 g / mol, to about 150,000 g / mol, preferably to about 100,000 g / mol, and a Staudinger index J 0 in a range from about 15 cm 3 / g to about 70 cm 3 / g and at least one second butyl rubber and / or at least one second polyisobutylene. The at least one second, preferably at least partially crosslinked, more preferably partially crosslinked, butyl rubber preferably has a Mooney viscosity ML(1+3) at 127°C in a range from about 65 MU to about 100 MU according to ISO 289:2005. The at least one second polyisobutylene preferably has a Staudinger index J 0 in a range from about 75 cm 3 / g to about 235 cm 3 / g and with an average relative molecular weight Mv in a range from about 150,000 g / mol, preferably from about 160,000 g / mol, to about 950,000 g / mol, preferably to about 850,000 g / mol. More preferably, the material of the at least one connecting layer comprises a third butyl rubber and / or a third polyisobutylene. The at least one third, preferably solid, butyl rubber preferably has an average molecular weight M w in a range from about 150,000 to about 2,000,000 and a Mooney viscosity ML(1+8) at 125°C in a range from about 20 MU to about 62 MU, measured according to ISO 289:2005. The at least one third polyisobutylene preferably has an average relative molar mass Mv in a range from about 900,000 g / mol, preferably from about 950,000 g / mol, to about 7,500,000 g / mol, preferably to about 6,500,000 g / mol, and a Staudinger index J 0 in a range from about 240 cm 3 / g to about 900 cm 3 / g. Preferably, the at least one connecting layer comprises a material selected from a group comprising at least a first polyisobutylene and / or a first butyl rubber and at least a second polyisobutylene and / or a second butyl rubber. Further preferably, the connecting layer comprises a material selected from a group comprising at least a first polyisobutylene and / or a first butyl rubber, at least a second polyisobutylene and / or a second butyl rubber, and at least a third polyisobutylene and / or a third butyl rubber.Particularly preferably, the at least one connecting layer comprises at least a first or at least a second polyisobutylene as well as at least a first or at least a second butyl rubber. Even more preferably, the at least one connecting layer comprises a first, a second and optionally a third butyl rubber, and no polyisobutylene. Even more preferably, the at least one connecting layer comprises a first, a second and optionally a third polyisobutylene, and no butyl rubber. Alternatively, the connecting layer comprises only a second butyl rubber or only a second polyisobutylene. In a further alternative embodiment, the connecting layer comprises only a third butyl rubber or only a third polyisobutylene.In a further alternative embodiment, the at least one connecting layer comprises a material selected from a group comprising at least one second polyisobutylene and / or one second butyl rubber and at least one third polyisobutylene and / or one third butyl rubber, preferably a second polyisobutylene and a third butyl rubber or a third polyisobutylene and a second butyl rubber. However, the connecting layer can also comprise a second and a third polyisobutylene or a second and a third butyl rubber.

[0023] The Staudinger index J 0 was formerly also called intrinsic viscosity. It is calculated from the flow time at 20°C through a capillary of an Ubbelohde viscometer using the following formula (Schulz-Blaschke equation): J 0 = η sp / c 1 + 0,31 × η sp cm 3 / g where η sp = t t o − 1 spezifische Viskosität , where t is the flow time of the solution with a Hagenbach-Couette correction, t 0 is the flow time of the solvent isooctane with a Hagenbach-Couette correction and c is the concentration of the solution in g / cm 3<. The average relative molar mass M v (viscosity average) is calculated using the following formula: J o × 10 2 3.06 0.65

[0024] Polyisobutylenes within the meaning of the present invention are preferably synthesized via cationic polymerization of isobutene (2-methylpropene) in a temperature range between approximately -100°C and approximately 0°C. The temperature influences the molar mass of the polyisobutene produced in this way; the lower the temperature, the higher the molar mass. Typically, boron trifluoride or aluminum trichloride in aqueous or alcoholic solution are used as initiators.

[0025] The at least one first polyisobutylene advantageously has a Staudinger index J 0 in a range from about 22 cm 3 / g to about 65 cm 3 / g, and even more preferably a Staudinger index J 0 in a range from about 25 cm 3 / g to about 45 cm 3 / g. Preferably, the at least one first polyisobutylene has an average relative molecular weight M v (viscosity average) in a range from about 24,000 g / mol, preferably from about 35,000 g / mol, to about 130,000 g / mol, preferably to about 95,000 g / mol, and more preferably an average relative molecular weight Mv in a range from about 30,000 g / mol, preferably from about 37,000 g / mol, to about 75,000 g / mol, preferably to about 70,000 g / mol. The at least one first polyisobutylene is advantageously present in an amount in a range from about 28 wt.% to about 60 wt.%, more preferably in an amount in a range from about 33 wt.% to about 50 wt.%, in each case based on the total amount of the at least one connecting layer.

[0026] The at least one second polyisobutylene preferably has a Staudinger index J 0 in a range from about 106 cm 3 / g to about 160 cm 3 / g. Preferably, the at least one second polyisobutylene has an average relative molecular weight Mv in a range from about 250,000 g / mol to about 600,000 g / mol, preferably up to about 550,000 g / mol. Preferably, the at least one second polyisobutylene is comprised in an amount in a range from about 10 wt.% to about 35 wt.%, more preferably in an amount in a range from about 13 wt.% to about 28 wt.%, in each case based on the total amount of the at least one connecting layer.

[0027] The at least one third polyisobutylene preferably has a Staudinger index J 0 in a range from about 400 cm 3 / g to about 800 cm 3 / g, and even more preferably a Staudinger index J 0 in a range from about 500 cm 3 / g to about 700 cm 3 / g. Preferably, the at least one third polyisobutylene has an average relative molecular weight MV in a range from about 1,500,000 g / mol, preferably from about 2,000,000 g / mol, to about 6,000,000 g / mol, preferably to about 5,000,000 g / mol, more preferably in a range from about 3,000,000 g / mol to about 5,000,000 g / mol, preferably to about 4,800,000 g / mol. The at least one third polyisobutylene is advantageously present in an amount in a range from about 1 wt.% to about 20 wt.%, more preferably in an amount in a range from about 2 wt.% to about 10 wt.%, even more preferably in an amount in a range from about 3 wt.% to about 8 wt.%, in each case based on the total amount of the at least one connecting layer.

[0028] The ratio of the at least one first polyisobutylene, i.e. the total amount of the first polyisobutylene used, even if a mixture is present, to the at least one second polyisobutylene, i.e. the total amount of the second polyisobutylene, even if this is present in a mixture, is advantageously in a range from about 2.5:1 to about 1:2.5, more preferably in a range from about 2.2:1 to about 1:1.

[0029] The polyisobutylenes used, i.e., the first, second, and third polyisobutylenes, advantageously have a glass transition temperature T g (measured calorimetrically by DSC) of less than -50°C, more preferably less than -58°C. The glass transition temperature of the at least one first, the at least one second, and the at least one third polyisobutylene is particularly preferably in a range from about -55°C to about -68°C, more preferably in a range from about -58°C to about -66°C. The higher molecular weight, at least one second polyisobutylene can thus still be considered a highly viscous liquid and exhibits a certain tendency to creep.

[0030] For the purposes of the present invention, the term butyl rubber refers in particular to copolymers or block copolymers of isobutene with approximately 0.5% by weight to approximately 5% by weight of isoprene, based on the total amount of butyl rubber, which are produced in particular by cationic polymerization. A crosslinking reaction can be initiated via the isoprene used and the carbon-carbon double bonds present therein, which act as functional groups. For the purposes of the present invention, the term butyl rubber also includes, in particular, halogenated butyl rubbers, especially those that are chlorinated or brominated (chlorobutyl rubber or bromobutyl rubber). Mixtures of several butyl rubbers can also be used, i.e., more than at least one butyl rubber.

[0031] The at least one first, preferably depolymerized, butyl rubber is preferably obtained by depolymerization of butyl rubbers (IIR). The at least one first butyl rubber has a low molecular weight. It is particularly preferably in liquid form at 23°C. In contrast, the at least one third butyl rubber is not depolymerized and has a high molecular weight compared to the first butyl rubber. The at least one third butyl rubber is advantageously in solid form at 23°C.

[0032] The at least one first, preferably depolymerized, butyl rubber preferably has an apparent Brookfield viscosity according to DIN EN ISO 2555: 2000-01 at 66°C in a range from about 600,000 mPa s to about 1,600,000 mPa s, more preferably in a range from about 700,000 mPa s to about 1,500,000 mPa s. The at least one first, preferably depolymerized, butyl rubber preferably has an average molecular weight M w in a range from about 20,000 to about 60,000. The at least one first, preferably depolymerized, butyl rubber advantageously has the property of undergoing a crosslinking reaction due to the unsaturated carbon-carbon double bonds present therein, even at low temperatures, in particular at room temperatures of, for example, 20°C or 23°C, or even at slightly elevated temperatures of, for example, 40°C to 50°C.Preferably, the first butyl rubber is comprised by the connecting layer in an amount in a range from about 20 wt.% to about 66 wt.%, preferably in an amount in a range from about 28 wt.% to about 60 wt.%, more preferably in an amount in a range from about 33 wt.% to about 50 wt.%, in each case based on the total amount of the at least one connecting layer.

[0033] The at least one second, at least partially crosslinked (hereinafter also referred to as partially pre-crosslinked) butyl rubber, which has a lower proportion of unsaturated bonds than conventional butyl rubbers, preferably has a Mooney viscosity ML(1+3) at 127°C in a range from about 70 MU to about 93 MU, more preferably in a range from about 78 MU to about 91 MU, measured according to ISO 289: 2005 or according to ASTM 1604-04. The specific density of the at least one second, partially crosslinked butyl rubber is advantageously in a range from about 0.5 to about 1.1, preferably in a range from about 0.9 to about 0.98, at a temperature of 25°C according to ASTM D1875 in the 2003 version. More preferably, the second butyl rubber is present in an amount ranging from about 1 wt% to about 20 wt%, more preferably in an amount ranging from about 2 wt% to about 10 wt%.-%, even more preferably in an amount in a range of about 3 wt.% to about 8 wt.%, in each case based on the total amount of the at least one connecting layer, of which at least one connecting layer comprises.

[0034] The at least one third butyl rubber advantageously has an average molecular weight M w in a range from about 200,000 to about 1,800,000, more preferably in a range from about 250,000 to about 600,000. Preferably, the at least one third butyl rubber has a Mooney viscosity ML(1+8) at 125°C in a range from about 30 MU to about 60 MU, more preferably in a range from about 40 MU to about 59 MU, even more preferably in a range from about 40 MU to about 55 MU, measured according to ISO 289:2005. The at least one third butyl rubber is advantageously present in an amount in a range from about 10 wt.% to about 50 wt.%, more preferably in an amount in a range from about 15 wt.% to about 35 wt.%, in each case based on the total amount of the at least one tie layer, comprised by the at least one tie layer.

[0035] Advantageously, the at least one third butyl rubber has unsaturation values ​​in a range from about 1 mol% to about 3 mol%, more preferably in a range from about 1.3 mol% to about 2.5 mol%. This means that preferably about 1 mol% to about 3 mol%, more preferably about 1.3 mol% to about 2.5 mol% of unsaturated bonds, i.e., carbon-carbon double bonds, are present as functional groups in at least one third butyl rubber. Particularly preferably, the at least one third butyl rubber is produced by copolymerizing isobutene and isoprene in methyl chloride as solvent. The unsaturation (the degree of unsaturation) of the at least one third butyl rubber can also be about 1.5 mol%, in particular about 1.5±0.5 mol%.

[0036] Preferably, the at least one connecting layer comprises, in addition to polyisobutylene and / or butyl rubber, at least one filler material, at least one antioxidant, at least one crosslinking agent, at least one elastomer and / or at least one stabilizer. The mentioned further constituents can be added alone or in combination to the at least one connecting layer. Particularly preferably, the at least one connecting layer comprises at least one filler material. The at least one filler material is preferably present in an amount ranging from approximately 20% by weight to approximately 70% by weight, more preferably in an amount ranging from approximately 30% by weight to approximately 65% ​​by weight, and even more preferably in an amount ranging from approximately 33% by weight to approximately 50% by weight, in each case based on the total amount of the at least one connecting layer. Particularly preferably, the at least one filler material is in powder or fiber form.For the purposes of the present invention, the term "fibrous" also includes filler materials that have a needle-like structure. Particularly preferably, the at least one connecting layer comprises at least one first powdered filler material and at least one second fibrous filler material. Particularly preferably, with such a combined addition of at least one powdered and at least one fibrous filler material, the fibrous filler material is added in an amount up to a maximum of that of the powdered filler material. A powdered or a fibrous filler material can be comprised by the at least one connecting layer in an amount ranging from approximately 10% to approximately 40% by weight, preferably in an amount ranging from approximately 12% to approximately 25% by weight, based in each case on the total amount of the at least one connecting layer.

[0037] Preferably, the at least one filler material is selected from a group of powdered mineral fillers or mineral and / or organic fibrous fillers. For example, it can be made of metal, zinc oxide, cellulose fibers, needle-shaped wollastonite, or the like. It can also be selected from a group of organic fibers, such as acrylonitrile fibers with a length in a range of about 1.5 mm to about 20 mm, more preferably with a length in a range of about 4 mm to about 15 mm, and a fineness in a range of about 0.5 dtex to about 100 dtex, more preferably with a fineness in a range of about 1 dtex to about 20 dtex, each measured according to ISO 1144 in the 1973 version.If a powdered filler, in particular a mineral powdered filler, is used, it advantageously has a residue in % in a sieve analysis according to DIN 66165, version 1987-04, of approximately 1% to approximately 5% for H-100 (100 µm), approximately 1% to approximately 5% for H-60 ​​(60 µm), and approximately 1% to approximately 5% for H-30 (30 µm). Advantageously, the at least one connecting layer comprises at least one filler material. If the filler material is powdered, it is advantageously selected from the group of mineral fillers; talc is particularly preferred.

[0038] The at least one elastomer is advantageously selected from a group comprising at least one ethylene-propylene-diene rubber. This includes, in particular, those copolymers or block copolymers as well as terpolymers which have a carbon-carbon double bond as functional groups. Mixtures of these can also be used. Terpolymers resulting from a polymerization reaction with ethylene, propylene, and a diene are particularly preferred. These are also called EPDM terpolymers and combine a saturated polymer backbone with unsaturated radicals in side groups. Particularly preferred within the meaning of the present invention are 5-ethylidene-2-norbornene, dicyclopentadiene, and / or 5-vinylidene-2-norbornene as the diene, in amounts of up to about 15% by weight, preferably in amounts ranging from about 0.3% by weight to about 12% by weight.When using 5-ethylidene-2-norbornene, amounts in a range of about 0.5 wt.% to about 11 wt.% are preferably used, and when using dicyclopentadiene, amounts in a range of about 1.0 wt.% to about 6.0 wt.% are preferably used. The above wt.% data in this paragraph are based on the total amount of monomers used in a polymerization to form an EPDM or ethylene-propylene rubber.

[0039] If at least one antioxidant is provided, it can be comprised by the at least one bonding layer, preferably in a mixture of different antioxidants, in an amount ranging from about 0.1 wt.% to about 1 wt.%, more preferably in an amount ranging from about 0.15 wt.% to about 0.5 wt.%, in each case based on the total amount of the at least one bonding layer. An antioxidant is a chemical compound that slows down or completely prevents the oxidation of other substances. The antioxidant can in particular be selected from a group comprising sterically hindered phenols, such as pentaerythriol tetrakis (3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate). A sterically hindered phenolic antioxidant provides protection against thermo-oxidative degradation in the corrosion protection tape according to the invention. They exhibit good compatibility therein.The antioxidant can be used in combination with other additives such as stabilizers. The example of pentaerythriol tetrakis (3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) is powdery, white to whitish, water-insoluble, and has a molecular weight of approximately 1176.5 g / mol and a melting range of approximately 110°C to approximately 125°C. Tris(2,4-di-tert-butylphenyl) phosphite can be used more preferably as an antioxidant. Tris(2,4-di-tert-butylphenyl) phosphite is powdery, white to whitish, has a molecular weight of 646.92 g / mol and a melting range of approximately 181°C to approximately 184°C.

[0040] If at least one stabilizer, which can also be referred to as a dispersing agent, is present in the at least one connecting layer, this is advantageously selected from a group comprising C10 to C24 carboxylic acids, and is advantageously stearic acid. The at least one stabilizer is preferably present in an amount ranging from about 0.05 wt.% to about 0.5 wt.%, based on the total amount of the at least one connecting layer, of which at least one connecting layer comprises. Metal salts of the aforementioned carboxylic acids, for example zinc stearates, or free carboxylic acids, such as free fatty acids having 12 to 24 carbon atoms, in particular stearic acid or oleic acid, can also be used as stabilizers.

[0041] Furthermore, the at least one bonding layer may also contain other additives that are customary and necessary depending on the intended use. In particular, the at least one bonding layer may further comprise at least one flame retardant and / or at least one crosslinking agent. If a flame retardant is provided, it is advantageously present in an amount ranging from approximately 0.02 wt.% to approximately 2 wt.%, based on the total amount of the at least one bonding layer.

[0042] According to the invention, at least one further layer of the corrosion protection tape is designed as a corrosion protection layer. The corrosion protection layer comprises at least one corrosion protection layer, more preferably precisely one corrosion protection layer. The corrosion protection layer serves to directly protect components from corrosion, in particular pipes, pipelines, tubular objects, pipelines and pipeline components, tanks and components of tanks, systems, and internal fittings, since it comes into direct contact with the component to be protected. The corrosion protection layer preferably forms at least one outer layer of the corrosion protection tape. Particularly preferably, the at least one corrosion protection layer is in contact with the pipe or component to be protected. More preferably, the corrosion protection layer forms a first outer layer and a second outer layer of the corrosion protection tape according to the invention.The corrosion protection layer comprises a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene. The preferred butyl rubbers and / or polyisobutylenes and their mixtures and compositions have already been described above in connection with the formation of the bonding layer. The information provided in connection with the formation of the at least one bonding layer applies accordingly to the layer(s) of the corrosion protection layer, with the quantities then being based on the total amount of the at least one corrosion protection layer.In particular, the at least one connecting layer and the at least one corrosion protection layer can comprise butyl rubber and / or polyisobutylene, which are identical, so that the at least one connecting layer and the at least one corrosion protection layer can be designed similarly with regard to the material and their properties. The at least one connecting layer and the at least one corrosion protection layer can, in particular, also be designed identically if no functionalization is provided, or can be identical except for such functionalization, for example, by a conductive material. Each corrosion protection layer is preferably designed in one or more layers, more preferably in a single layer.

[0043] Preferably, at least one of the carrier layers, preferably both carrier layers, is designed such that it does not comprise any fibers in a polymer matrix.

[0044] Preferably, the at least one layer formed as a support layer of at least one of the carrier layers is designed as a film, nonwoven, woven fabric, net, scrim, knitted fabric, perforated film or grid; more preferably, the support layer is designed as a film or grid. Preferably, the support layer is designed as a film, nonwoven, woven fabric, net, scrim, knitted fabric, perforated film or grid; more preferably, the support layer is designed as a film or grid. More preferably, the support layers of the at least two carrier layers are designed as a film, nonwoven, woven fabric, net, scrim, knitted fabric, perforated film or grid; more preferably, the support layers of the at least two carrier layers are designed as a film or grid. More preferably, the support layer is designed in the shape of a strip, but can also be mat-shaped or otherwise flat.The support layer can be designed in particular in the form of a carrier film, a shrink band or tube, a stretch brake or as a grid. The design as a carrier film or as a stretch brake, which is also film-like and preferably band-like, differs in particular in its thickness. If the support layer is designed as a carrier film, it advantageously has a thickness in a range from approximately 0.2 mm to approximately 1.2 mm, more preferably a thickness in a range from approximately 0.3 mm to approximately 1.0 mm. If the support layer is designed as a stretch brake, it preferably has a thickness in a range from approximately 15 µm to approximately 100 µm, more preferably in a range from approximately 20 µm to approximately 75 µm.The function of a stretch brake is to prevent overstretching of the corrosion protection tape, particularly when it is spirally wound around a pipe to be wrapped, such as a pipeline, but also, for example, when applying corrosion protection to the floor of a tank, e.g., an oil tank. The carrier film or the stretch brake can also be perforated. If the support layer is designed as a grid, it preferably has recesses formed by a crossed arrangement of elongated parts. The support layer, designed as a nonwoven, woven fabric, net, scrim, knitted fabric, perforated film, or grid, can form the carrier layer itself in a single-layer carrier.

[0045] According to the invention, an adhesion-promoting layer is arranged as a further layer of the carrier layer on at least one surface of the carrier layer of at least one of the carrier layers. An adhesion-promoting layer is preferably arranged as a further layer of the carrier layer on at least one surface of the carrier layer, even more preferably on at least one surface of the carrier layers of the at least two carrier layers. More preferably, the carrier layer has an adhesion-promoting layer on both surfaces thereof. When applied to both surfaces of the carrier layer, the two adhesion-promoting layers applied there can be identical, but also different. Preferably, the adhesion-promoting layer is applied over the entire surface of at least one surface of the carrier layer. The adhesion-promoting layer preferably has an adhesion-promoting composition comprising about 20% to about 70% by weight of at least one polymer selected from a group comprising polyethylene, polypropylene, polyvinyl chloride, and / or thermoplastic elastomers; and about 20% to about 65% by weight of at least one butyl rubber and / or polyisobutylene; where the data in percent by weight, abbreviated as wt.%, are based on the total amount of the adhesion-promoting layer.

[0046] The adhesion-promoting layer further preferably comprises an adhesion-promoting composition comprising about 20 wt.% to about 70 wt.% of at least one polymer selected from a group comprising polyethylene, polypropylene, polyvinyl chloride and / or thermoplastic elastomers; about 20 wt.% to about 65 wt.% of at least one butyl rubber and / or polyisobutylene; and about 6 wt.% to about 35 wt.% of at least one elastomer selected from a group comprising ethylene-propylene rubber and / or ethylene-propylene-diene rubber; where the data in percent by weight, abbreviated as wt.%, are based on the total amount of the adhesion-promoting layer.

[0047] The at least one polymer in the adhesion-promoting layer is preferably present in an amount ranging from about 30 wt.% to about 60 wt.%, more preferably in an amount ranging from about 32 wt.% to about 55 wt.%, in each case based on the total amount of the adhesion-promoting layer. The adhesion-promoting layer particularly preferably comprises precisely one polyethylene or precisely one polypropylene. With regard to its chemical and physical properties, the at least one polyethylene and / or polypropylene is preferably one as defined above in connection with the support layer.

[0048] Preferably, the at least one polymer in the at least one, preferably at least two, adhesion-promoting layers is electron beam crosslinkable. Further preferably, the carrier material forming the support layer is also electron beam crosslinkable. Particular preference is given to using a preferably electron beam crosslinkable medium-density or higher-density polyethylene, or else a polypropylene, preferably an isotactic polypropylene. When polypropylene is used, this can preferably be used as a masterbatch with at least one crosslinking accelerator and, if appropriate, suitable copolymers for successful electron beam crosslinking. Electron beam crosslinking of the electron beam crosslinkable polymers improves, in particular, their temperature resistance, but also their mechanical strength.If at least one polyethylene is used, this advantageously has a density of at least about 800 kg / m 3< , measured according to ISO 1872-21 ISO 1183, and is preferably in a range from about 850 kg / m 3< to about 1,000 kg / m 3< , more preferably in a range from about 900 kg / m 3< to about 980 kg / m 3< . If at least one polypropylene is used, this advantageously has a density of preferably at least 800 kg / m 3< , measured according to ISO 1872-2 / ISO 1183, and is preferably in a range from about 850 kg / m 3< to about 980 kg / m 3< , more preferably in a range from about 890 kg / m 3< to about 960 kg / m 3< . Electron beam crosslinking is advantageously carried out with β-rays, but can also be carried out with γ-rays. Irradiation is preferably carried out with a dose in the range of approximately 25 kGy to approximately 250 kGy.

[0049] However, the at least one polymer does not have to be electron beam crosslinkable, particularly if other, alternative methods of crosslinking or bonding can be used, such as heat treatment. Heat treatment also makes it possible to crosslink or bond the adhesion-promoting layer or the support layer, for example, with a connecting layer. The heat treatment is carried out at a temperature at which the viscosity of the constituents of the support layer or the adhesion-promoting layer, in this case especially of the at least one butyl rubber and / or polyisobutylene and / or the at least one elastomer selected from a group comprising ethylene-propylene rubber and / or ethylene-propylene-diene rubber, is reduced, preferably at about 150°C to about 200°C, more preferably at about 160°C to about 180°C. This can be achieved, for example, by appropriately designing a calender roll.

[0050] The at least one butyl rubber in the adhesion-promoting layer is preferably selected from a group comprising at least partially crosslinked and / or depolymerized butyl rubbers, more preferably those as defined above with regard to their chemical and physical properties in connection with the at least one connecting layer of the connecting ply. The adhesion-promoting layer particularly preferably comprises precisely one butyl rubber, preferably an at least partially crosslinked butyl rubber. In an alternative embodiment, the adhesion-promoting layer preferably comprises precisely one at least partially crosslinked butyl rubber and precisely one depolymerized butyl rubber. The adhesion-promoting layer preferably comprises at least one butyl rubber in an amount of at least about 23% by weight to about 60% by weight, more preferably in an amount ranging from about 25% by weight to about 53% by weight.-%, in each case based on the total amount of the adhesion-promoting layer. If a mixture of an at least partially crosslinked butyl rubber with an uncrosslinked butyl rubber is provided, the crosslinked butyl rubber is present in such a mixture in an amount ranging from about 5 wt.% to about 95 wt.% and the depolymerized butyl rubber is present in such a mixture in an amount ranging from about 95 wt.% to about 5 wt.%. Preferably, such a mixture of exactly one at least partially crosslinked butyl rubber and one depolymerized butyl rubber comprises the at least partially crosslinked butyl rubber in an amount ranging from about 45 wt.% to about 95 wt.% and the uncrosslinked butyl rubber in an amount ranging from about 5 wt.% to about 55 wt.%.More preferably, the ratio of the depolymerized butyl rubber to the at least partially crosslinked butyl rubber in a mixture of exactly one at least partially crosslinked butyl rubber and exactly one polymerized butyl rubber in the adhesion-promoting layer is in a range from about 1.1:1 to about 4:1.

[0051] Preferably, the at least one elastomer in the adhesion-promoting layer is an ethylene-propylene-diene rubber, preferably in an amount in a range from about 18 wt.% to about 30 wt.%, particularly preferably in a range from about 15 wt.% to about 28 wt.% (wt.% in each case based on the total amount of the adhesion-promoting layer), whose diene is a 5-ethylidene-2-norbornene in an amount in a range from about 0.8 wt.% to about 8 wt.%, preferably in an amount in a range from about 1 wt.% to about 7.5 wt.%, even more preferably in an amount in a range from about 1.4 wt.% to about 7 wt.%, based on the total amount of the monomers used in a polymerization to form the ethylene-propylene-diene rubber.Ethylene-propylene-diene rubbers which can be used in the adhesion-promoting layer have already been described above with regard to their chemical and physical properties in connection with the formation of at least one connecting layer of the connecting layer.

[0052] The adhesion-promoting layer can further comprise at least one additive selected from a group comprising tackifiers, antioxidants, catalysts, co-reagents and / or pigments. Pigments, in particular color pigments, are particularly preferred. These can also be used, for example, in a masterbatch with the at least one polymer. If the at least one polymer is used in the form of a masterbatch, it preferably comprises at least 80 wt.%, based on the total amount of the masterbatch, of the polymer, more preferably at least 85 wt.% of the at least one polymer. A pigment, for example carbon black, is preferably comprised in such a masterbatch of the at least one polymer in an amount ranging from about 0.5 wt.% to about 20 wt.%, more preferably in an amount of about 1 wt.% to about 15 wt.%.

[0053] Hydrocarbon resins can be used as tackifiers, preferably in a range from about 0.5 wt.% to about 10 wt.%, more preferably in a range from about 1 wt.% to about 5 wt.%, in each case based on the total amount of the adhesion-promoting layer. At least one antioxidant can also be added to the adhesion-promoting layer if desired. A mixture of different antioxidants is preferably provided. The at least one antioxidant is present in an amount in a range from about 0.1 wt.% to about 1 wt.%, more preferably in an amount in a range from about 0.2 wt.% to about 0.5 wt.%, in each case based on the total amount of the adhesion-promoting layer. Possible antioxidants used in the adhesion-promoting layer include, in particular, those mentioned above in connection with the connecting layer.The antioxidant is preferably tris(2,4-di-tert-butylphenyl)phosphite or selected from a group comprising sterically hindered phenols, such as pentaerythriol tetrakis (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate). Organic compounds containing zinc or tin, for example zinc stearates or zinc oleates, alone or in a mixture, are preferably used as catalysts. The catalysts, individually or in a mixture, are preferably present in an amount ranging from about 0.001 wt.% to about 10 wt.%, preferably in a range from about 0.005 wt.% to about 4 wt.%, in each case based on the total amount of the adhesion-promoting layer.

[0054] More preferably, the adhesion-promoting layer can comprise at least one co-reagent for the catalyst agent, selected from a group comprising triallyl cyanurate, triallyl isocyanurate, triallyl phosphate, and / or divinylbenzene, and particularly preferably a triallyl cyanurate and / or a triallyl isocyanurate. The co-reagent serves, in particular, to compatibilize the catalyst agent used in the layer. The adhesion-promoting layer advantageously comprises the co-reagent in an amount ranging from about 0.01 wt.% to about 5 wt.%, more preferably in an amount ranging from about 0.2 wt.% to about 5 wt.%, preferably up to about 3 wt.%, based on the total amount of the adhesion-promoting layer.Particularly preferably, the co-reagent used is one from a group comprising triallyl cyanurate, triallyl isocyanurate and / or triallyl phosphate, particularly preferably at least one triallyl cyanurate, wherein the above-mentioned co-reagents can be present in the layer in an amount in a range from about 0.02 wt.% to about 2 wt.%, preferably in an amount in a range from about 0.025 wt.% to about 0.3 wt.%, in each case based on the total amount of the adhesion-promoting layer.

[0055] Particularly preferred adhesion-promoting layers each comprise precisely one polyolefin, precisely one butyl rubber, or precisely one polyisobutylene, depending on the material used for the at least one connecting layer of the at least one connecting ply, and precisely one elastomer. If the at least one connecting layer is formed from polyisobutylene, polyisobutylene is preferably also contained in the adhesion-promoting layer of the carrier which faces this at least one connecting layer, if present. If the at least one connecting layer is formed from butyl rubber and polyisobutylene, butyl rubber and polyisobutylene are preferably also contained in the adhesion-promoting layer of the carrier which faces this at least one connecting layer, if present.If the at least one connecting layer is formed from butyl rubber, butyl rubber is preferably also contained in the adhesion-promoting layer of the carrier, which faces this at least one connecting layer, if present. Particularly preferably, a polyethylene or a polypropylene, preferably an electron beam crosslinkable one, is used as exactly one polyolefin in the adhesion-promoting layer. A crosslinked butyl rubber, which can also be referred to as pre-crosslinked, is preferably used as exactly one butyl rubber. An ethylene-propylene-diene rubber, very particularly preferably one with 5-ethylidene-2-norbornene as the diene, is advantageously used as exactly one elastomer in the adhesion-promoting layer. A particularly preferred adhesion-promoting layer comprises about 22% by weight to about 55% by weight of a crosslinked butyl rubber, about 28% by weight to about 53% by weight.-% of at least one, preferably electron-beam-crosslinkable, polyethylene or polypropylene, and about 12 wt.% to about 30 wt.% of an ethylene-propylene-diene rubber with 5-ethylidene-2-norbornene as the diene in an amount of about 1.5 wt.% to about 5 wt.%, based on the monomers used in a polymerization to form the ethylene-propylene-diene rubber. The above-mentioned weight percentages, with the exception of the diene, refer to the total amount of the adhesion-promoting layer.

[0056] The advantage of the adhesion-promoting layer is that it can function as such even at higher temperatures, such as those encountered when warm or even hot media flow through a pipe or pipeline, so that no detachment phenomena occur in the layer composite of the bonding layer and the carrier or carrier layer, and it also provides sufficient mechanical strength. Furthermore, when at least one electrically conductive material is arranged in the adhesion-promoting layer, due to its composition, in particular its chemical and / or physical properties, a good embedding of the conductive material can be achieved, so that it is well and evenly embedded in the adhesion-promoting layer. The adhesion-promoting layer exhibits good peel resistance, which can be determined according to DIN EN 12068, version 1999-03, not only at elevated temperatures of 80°C or higher, but also at room temperature, i.e.20°C or 23°C. The above-mentioned peel resistance refers to the mechanical peel test according to DIN EN 12068, version 1999-03, relating both to the application of a corrosion protection tape with an adhesion-promoting layer on a factory coating of a pipe, such as a gas line or pipeline, and to an application on an uncoated pipe outer surface, for example, a steel pipe.

[0057] The greatly improved peel resistance demonstrates the very good mechanical strength that can be achieved with the adhesion-promoting layer in the corrosion protection tape according to the invention. This also applies at higher temperatures, in particular at temperatures of 80°C and above. Furthermore, the adhesion-promoting layer provides excellent adhesion to the carrier or the carrier layer, also in the form of a stretch retarder. Another advantage is that, due to the specific composition of the adhesion-promoting layer, when arranged on the base layer to form the carrier, it can be produced together with the base layer by a lamination process or a coextrusion process, preferably a coextrusion process, and, if necessary, can subsequently be subjected to electron beam crosslinking together with the base layer.Depolymerization of the butyl rubber or polyisobutylene, which is disadvantageous due to electron beam crosslinking, is compensated for by the use of the specific weight proportions and the addition of at least one elastomer. This ultimately makes it possible to obtain backings with an adhesion-promoting layer on one, preferably both, opposite first and second surfaces of the support layer, which have improved thermal and mechanical strength.

[0058] Due to these improved properties, corrosion protection tapes according to the invention provided with an adhesion-promoting layer can, depending on the design, particularly with regard to the thickness of the supporting layer used, be laid on pipes such as gas lines or pipelines, without the pipes having to be embedded in sand after being provided with corrosion protection by the corrosion protection tape according to the invention, whereby the sand must also be brought in from outside the construction site in question. Instead, for example, the excavated material on the construction site can be used, if necessary after comminution by suitable crushers to produce certain soil qualities, for the bedding of, for example, the gas line or pipeline. This can result in considerable cost savings, be it with regard to the transport and storage of the sand or with regard to reduced environmental damage due to reduced movement of heavy equipment.

[0059] Preferably, the at least one corrosion protection layer and / or the at least one connecting layer can fuse with an adhesion-promoting layer. In an embodiment in which the carrier comprises at least one, preferably exactly one, support layer and two adhesion-promoting layers arranged on the two opposite surfaces of the support layer, and which comprises a corrosion protection layer and a connecting layer, with at least one adhesion-promoting layer being arranged exposed on one of the two surfaces of the carrier, the corrosion protection layer, which in the case of a particularly spiral wrapping, for example of a pipe or pipeline, faces an outer surface of the pipe or pipeline, of the corrosion protection tape, fuses with the exposed adhesion-promoting layer in the overlap region of the wrapping.After the wrapping of the pipe or pipeline is completed, a coating forms on the pipe or pipeline after a certain period of time, which also depends on the temperature, due to the fusion properties of the connecting layer or corrosion protection layer and the adhesion-promoting layer. As a result, the corrosion protection tape according to the invention makes the wrapped pipe or pipeline watertight and oxygen-tight. The pipe or pipeline is protected from corrosion even in the overlap area due to the self-fusion.

[0060] Preferably, at least one electrically conductive material and / or at least one core material can be arranged, preferably embedded or arranged on a surface thereof, in the at least one connecting layer and / or in the at least one corrosion protection layer and / or in at least one of the at least two carrier layers. This achieves further functionalization of the corrosion protection strip according to the invention. Core material within the meaning of the present invention includes devices comprising transmitter-receiver systems, sensors, detectors, pickups, and / or probes.The electrically conductive material or the core material is embedded in one of the mentioned layers of the corrosion protection tape according to the invention or one of the layers thereof if the material to be embedded is arranged within the layer or layer, thus the material to be embedded is completely surrounded by the layer or layer or the material of the layer or layer. Exceptions are the longitudinal edges and / or the end regions of the corrosion protection tape according to the invention between the longitudinal edges or the end edges thereof, where the electrically conductive material to be embedded or the core material may be exposed, i.e., not embedded on all sides.Examples of this include the addition of conductive carbon black or intrinsically conductive materials in powder form to the material of the said layer or layers thereof, but also the provision of a non-perforated metal foil as a supporting layer and in particular the only layer in the supporting layer, which is then surrounded on one side by the connecting layer and on the other side by a corrosion protection layer and thus embedded. An electrically conductive material and / or a core material is also embedded if the material of the layer or layers, in particular butyl rubber and / or polyisobutylene, in particular the connecting layer and / or the corrosion protection layer, protrudes through recesses, holes or perforations arranged in the electrically conductive material and / or core material, thereby integrating the material to be embedded with the layer or layers, in particular butyl rubber and / or polyisobutylene.Examples of this include the formation of the carrier layer as a metal grid, a metal mesh, a metal knitted fabric, or a perforated metal foil, which then form a single-layer carrier layer. Completely surrounding the material to be embedded with the material of the layer or ply is not necessary, but can be done. What is relevant is the creation of a sufficient bond between the material to be embedded, especially if it has recesses or openings, and the material of the layer or ply. This is done to prevent delamination of the material to be embedded from the layer or ply, in particular butyl rubber and / or polyisobutylene.

[0061] The conductivity of a material or material mixture depends on the availability and density of mobile charge carriers. These can be loosely bound electrons, such as in metals, but also ions or delocalized electrons in organic molecules, often described by mesomeric boundary structures. Materials with freely mobile charge carriers are conductive.The advantage of providing the conductive material in the corrosion protection tape according to the invention is that current can be conducted in the pipe wrapped, for example, with the corrosion protection tape according to the invention up to a point that is damaged, in particular also in an overlapping area, especially in the case of spiral winding, which often has no contact with the pipe in the area between a lower corrosion protection layer of the upper winding and an upper corrosion protection layer or carrier layer of the previous winding and is therefore susceptible to spiral corrosion despite the passive protection device. Spiral corrosion is thus reliably prevented. Preferably, an electrically conductive material is embedded in at least one layer, preferably exactly one layer. More preferably, an electrically conductive material is embedded in at least two layers. The electrically conductive material provides a second barrier against corrosion.

[0062] The electrically conductive material is preferably selected from a group comprising metals, conductive polymers, and / or carbon. Further preferably, the electrically conductive material is selected from a group comprising metals and / or conductive polymers. Metals are electron conductors; their electrons in the conduction band are mobile and excellent at transporting electrical current. The electrical conductivity of metals is preferably in a range between approximately 0.5*10 6< S / m and approximately 100*10 6< S / m at room temperature. Conductive polymers, particularly intrinsically conductive polymers, are plastics with electrical conductivity. The conductivity of the polymer is achieved through conjugated double bonds and / or doping, which enable free mobility of charge carriers in the doped state.The electrical conductivity of conductive polymers preferably ranges between approximately 10 -5 < S / m and approximately 10 5 < S / m at room temperature (20°C). Carbon can be used in the form of fibers, powder, or particles, including platelets, in the form of graphite or graphene, particularly as an additive to the plastic materials intended for the base layer. The advantage of using platelet-shaped or particulate electrically conductive materials, such as carbon (graphite or graphene), is the ability to achieve a uniform distribution in at least one layer of the corrosion protection tape.

[0063] Preferably, the electrically conductive material is arranged over a flat or partial area of ​​the corrosion protection strip. The probability that a conductive material arranged over a flat or partial area will be located in the area of ​​damage or the damaged area in the event of damage is greater than with a unidirectional material, for example, a wire-like material such as a metal wire, which can also be used. The coated pipe is advantageously reliably protected against corrosion with a flat or flat-arrangable electrically conductive material.

[0064] The electrically conductive material is preferably in the form of powders, particles, strips, wires, woven fabrics, nets, nonwovens, knitted fabrics, or in the form of metallic or metallized, preferably perforated, foils. If the electrically conductive material is in the form of woven fabrics, nets, nonwovens, knitted fabrics, or in the form of metallic or metallized, preferably perforated, foils, it can form the carrier layer or at least one layer of the carrier of a carrier layer, preferably the base layer, and more preferably forms the carrier layer alone.

[0065] The electrically conductive material is particularly preferably a woven fabric, even more preferably a hybrid woven fabric comprising conductive and non-conductive materials. This is preferably formed as the supporting layer of the carrier layer, and more preferably forms the carrier layer alone. Preferably, a first material of the woven fabric is selected from a group comprising at least one polyamide and / or polyester fiber materials, and is preferably a polyester. The first material is preferably yarn-like. Preferably, a second material of the woven fabric is selected from a group comprising conductive metals, in particular stainless steel and / or copper and / or bronze. It is likewise preferably yarn-like or wire-like. Preferably, a thickness (diameter) of the first material is in a range between approximately 0.003 mm and approximately 0.30 mm. Preferably, the second material has the form of a corrugated, yarn-like wire.In the case of a wire-like design or a design as a wire, the second material is preferably a stainless steel wire and / or a copper wire and / or a bronze wire. If stainless steel is used as the second material, this is preferably a material 1.4301 according to DIN EN 10088-3. The thickness (diameter) of the second material is preferably in a range between approximately 0.003 mm and approximately 0.30 mm. A corrugated shape of the wire and / or the type of weaving with the first, yarn-like material preferably enable the fabric to adapt to the shape of the pipe when wrapped with the corrosion protection tape according to the invention under tension. The first yarn-like material is preferably arranged in the longitudinal direction and the second yarn-like material in the transverse direction of the corrosion protection tape according to the invention. A third material is preferably provided.The third material can be identical to the second material and is preferably made of stainless steel and / or copper and / or bronze. The thickness (diameter) of the third material is preferably in a range between approximately 0.003 mm and approximately 0.30 mm. The first yarn-like material is preferably arranged alternately with the third yarn-like material in the longitudinal direction and the second yarn-like material in the transverse direction of the corrosion protection tape according to the invention. In the longitudinal direction, the first yarn-like material and the third yarn-like material are preferably arranged at a distance of approximately 0.2 mm to approximately 3 cm, preferably between approximately 0.3 mm and approximately 2.2 cm. The first material is preferably a first warp yarn. The second material is preferably a weft yarn. A warp yarn is a thread that is stretched longitudinally in a loom in a weaving mill.In the finished fabric, the warp yarns lie parallel to the selvedge, while weft yarns run perpendicular to it. Preferably, the third material is a second warp yarn. The first and second warp yarns are preferably arranged alternately in the fabric. Preferably, the fabric has a plain weave, but can also have a twill weave. A stitch of a fabric, preferably a hybrid fabric, is preferably rectangular or square. A stitch is a loop of wire that is created during knitting or crocheting or by linking. Preferably, the size of a rectangular, in particular square, stitch of the hybrid fabric is in a range between approximately 0.3 mm x 0.3 mm and approximately 3.0 mm x 3.0 mm.

[0066] A suitable fabric preferably has a permeability value according to DIN 1 81 30 between about 10 -8< to about 10 -2< m / s, more preferably between about 10 -6< to about 10 -3< m / s, particularly preferably between about 10 -5< to about 10 -4< m / s. More preferably, the fabric has a mesh size according to DIN ISO 9044:2017-11 between about 0.005 mm to about 50 mm, more preferably between about 0.01 mm to about 10 mm, particularly preferably between about 0.05 mm to about 5 mm, more preferably in a range from about 0.2 mm to about 3 mm, and even more preferably in a range from about 0.4 mm to about 2 mm. The mesh size is the distance between two adjacent warp or weft yarns.

[0067] The electrically conductive material is preferably in the form of metallized films or in the form of a metal foil. The metallized film can be, for example, a rescue film. A metallized film is, for example, a plastic film vapor-deposited with a metallic material. A metal foil consists only of metal. The film, regardless of its design, preferably has recesses, for example in the form of perforations, to ensure embedding with the material of the corrosion protection layer and / or connecting layer and / or an adjacent carrier layer. The film is preferably perforated. The perforation is preferably circular. The perforation is preferably full-surface, but can also be part of the film.In the connecting layer, the film can be embedded in the material thereof or arranged on the first and / or second surface of the connecting layer, lying internally between the carrier and connecting layers. Perforated metallic or metallized films as a support layer preferably form a single-layer carrier. Films filled with metallic particles can also be provided, for example made of polyethylene with conductive carbon black incorporated therein, or in the form of mixtures of polyethylene with the addition of conductive intrinsic polymers. Conductive films can be coextruded together with adhesion-promoting layers on both surfaces of the film serving as the support layer, thus forming a carrier layer. At least one adhesion-promoting layer of a carrier layer can also be conductive, as described above for the support layer.When manufactured in coextrusion with the base layer, for example, only the base layer, only at least one or, preferably in the case of coextrusion with two adhesion-promoting layers, both adhesion-promoting layers, or both the base layer and at least one or both adhesion-promoting layers can be designed to be electrically conductive.

[0068] The electrically conductive material is preferably present in a polymer-filled form. Carbon black, a form of carbon, or powder made of conductive metals can be used as the electrically conductive material, preferably as a batch with an elastomer, preferably polyethylene, polypropylene, butyl rubber, polyisobutylene, or a thermoplastic elastomer. It is preferably added to the material from which the connecting layer, the corrosion protection layer, or the carrier layer, in particular the base layer, are made, in powder or particle form, including flake-like form (as pure form or in batch form). The addition of conductive materials made of metal powders, carbon black, or similar materials is unnecessary or can be omitted if intrinsically conductive polymers are used.

[0069] Preferably, the electrically conductive material provides conductivity between the first and second longitudinal edges of the corrosion protection tape. The current can be transported from one longitudinal edge to the other. For example, after wrapping around a pipe or pipeline and fusing, the corrosion protection tape according to the invention forms a continuous coating on the pipe or pipeline. An electrical current can be transmitted externally through the coating from one end of the pipe to the other end, even in the overlapping areas created during wrapping, so that spiral corrosion is reliably prevented in the event of damage. In particular, spiral corrosion is advantageously prevented even in areas farther away from the damage.

[0070] In the event of damage to a coating made from the corrosion protection tape, the electrically conductive material preferably provides conductivity at one edge of the damage, allowing an electrical current to be conducted to the damaged area. This provides sufficient electrons to prevent corrosion. The pH value in the area surrounding the damaged area rises to alkaline, thus protecting the damaged area, even if the coating detaches.

[0071] Preferably, the electrically conductive material is arranged in at least one layer of the corrosion protection strip according to the invention so as to be substantially non-elastic in a transverse direction, defined by a shortest connection between the first and second longitudinal edges of the corrosion protection strip. The conductive material preferably extends across the entire width of the material between the first longitudinal edge and the second longitudinal edge. The advantage is that the current can be reliably conducted from a first longitudinal edge of the corrosion protection strip to the second longitudinal edge. In a direction running perpendicular to the transverse direction in the corrosion protection strip from the beginning to the end thereof, i.e. in the longitudinal direction, the conductive material as defined above is preferably designed to be substantially elastic or such that it does not tear due to the tensile forces acting on the strip during winding.This can be achieved, for example, by a corrugated shape of the conductive material, in particular a woven fabric, or by providing loops therein, especially in woven and knitted fabrics. The conductive material preferably extends over the entire length of the material. The corrosion protection tape itself is preferably designed to be substantially elastic in a longitudinal direction. The length of the corrosion protection tape can increase under tensile load.

[0072] An additional advantage of the transverse and / or longitudinal conductivity of the corrosion protection tape, which is guaranteed even in the absence of water, is that corrosion protection is possible even if, for example, the soil has already dried out in individual sections along a pipeline. An ingress of current, even if it occurs at a distant location, can reach the affected area along the central axis of a pipe, such as a pipeline, thanks to the longitudinal conduction in the tape. This can be achieved particularly advantageously when the tape is completely wrapped around a pipe or pipeline over its entire length, or at least for a certain length of the pipe or pipeline.Even if only one weld seam, for example, of a pipeline, is coated with the corrosion protection tape according to the invention, the damaged area could be located at the top of the pipe, and the current could enter, for example, at the bottom of the pipe if sufficient conductivity of the surrounding area above is not guaranteed. The additional corrosion protection function of the corrosion protection tape according to the invention, provided by the at least one electrically conductive material arranged therein, is also ensured in such a case.

[0073] Preferably, the electrically conductive materials in the form of woven fabrics, nets, scrims, knitted fabrics, nonwovens or metallic or metallized, preferably perforated, foils are embedded in the transverse direction of the corrosion protection tape and / or in the longitudinal direction of the corrosion protection tape in the at least one connecting layer and / or the at least one corrosion protection layer and / or arranged on at least one surface of the at least one connecting layer and / or the at least one corrosion protection layer.

[0074] Preferably, the electrically conductive material is substantially completely surrounded by the material of the connecting layer, the carrier layer, in particular the carrier layer and / or the adhesion-promoting layer, and / or the corrosion protection layer, except for regions on the first and second longitudinal edges of the corrosion protection strip opposite the first longitudinal edge. Preferably, the electrically conductive material is substantially completely surrounded by the material of the at least one connecting layer and / or the corrosion protection layer, except for regions on the first and second longitudinal edges. In this way, the conductive material is protected and does not itself corrode.

[0075] Preferably, at least one core material is arranged, preferably embedded, in the at least one connecting layer, in at least one of the at least two carrier layers, and / or in the at least one corrosion protection layer. Core materials comprise devices that enable automatic and contactless identification and localization of target variables. The core material comprises RFID systems (RFID stands for radio frequency identification), a technology for transmitter-receiver systems using radio waves, sensors, detectors, pickups, and / or probes. The latter devices, in particular, can record chemical or physical properties qualitatively or quantitatively as a measured variable. The data recorded by the devices can be converted into a further processed signal and made available for further processing, for example, to detect and / or localize defects in a pipeline, for example, a weld seam thereof.

[0076] The present invention further relates to a method for applying the corrosion protection tape according to the invention as corrosion protection to components, in particular pipes, pipelines, tubular objects, pipelines and pipeline components, tanks and components of tanks, as well as to other systems and fittings by applying the corrosion protection tape to them. A pipe is a cylindrical hollow body which primarily serves to convey gases, liquids and / or solid bodies. A pipe can be, for example, a pipe of a water pipe or a district heating system or a pipeline, for example for oil, gases and / or chemical substances. Components of tanks include, for example, tank ends, metal containers, fittings and tank connections.

[0077] Particularly preferably, in the method for applying the corrosion protection tape according to the invention, components such as pipes, pipelines, tubular objects, pipes and pipe components, and tanks are wrapped with the corrosion protection tape according to the invention. The corrosion protection tape according to the invention makes a second or further wrapping or providing of components such as in particular pipes, pipelines, tubular objects, pipes and pipe components, and tanks, with additional protection, for example in the form of a protective tape or a protective mat, superfluous. The corrosion protection tape according to the invention makes it possible to dispense with the provision or wrapping of additional, mechanical protection.For systems comprising pipes with the corrosion protection tape according to the invention comprising at least four layers, the at least one first and at least one second wrapping known from the prior art, which thus requires two work steps, can be omitted and only a single wrapping can be performed in a single work step. The second wrapping according to the prior art is carried out either again with the same or a similar corrosion protection tape or with a mechanical protection tape.

[0078] The present invention further relates to a method for producing the corrosion protection tape according to the invention as defined above in various embodiments by exerting pressure on at least a first, at least two-layer corrosion protection tape and on at least a second, at least two-layer corrosion protection tape, wherein the first and the second corrosion protection tape comprise at least one carrier layer and at least one corrosion protection layer, such that the first or the second corrosion protection tape is brought into contact with the respective other corrosion protection tape, so that at least one corrosion protection layer of the first or the second corrosion protection tape forms a connecting layer, arranged between the carrier layers of the at least one first and second corrosion protection tape, and the at least one further corrosion protection layer of the first or second corrosion protection tape forms an outer layer of the corrosion protection tape.Preferably, contact between the connecting layer of the first or second corrosion protection tape and the carrier layer of the other corrosion protection tape occurs directly. The contact between the connecting layer of the first or second corrosion protection tape and the carrier layer of the other corrosion protection tape more preferably occurs without a primer or one or more additional layers. Preferably, at least one first, at least two-layer corrosion protection tape and at least one second, at least two-layer corrosion protection tape are used to produce the corrosion protection tape according to the invention. The first and second corrosion protection tapes comprise at least one carrier layer and at least one corrosion protection layer.To produce the corrosion protection tape according to the invention, the first corrosion protection tape and the second corrosion protection tape are brought into contact such that the corrosion protection layer of the first or second corrosion protection tape is brought into contact with the carrier layer of the respective other corrosion protection tape. By bringing the first and second corrosion protection tapes into contact or subsequently bringing them into contact, a connecting layer is formed from the respective corrosion protection layer of the first and second corrosion protection tapes by exerting pressure, which is arranged between the carrier layer of the first corrosion protection tape and the carrier layer of the second corrosion protection tape. Bringing the first and second corrosion protection tapes into contact with at least one carrier layer and at least one corrosion protection layer can take place before or simultaneously with the exertion of pressure on the first and second corrosion protection tapes.At the same time, this can be achieved, for example, by feeding the first and second corrosion protection strips separately into a roll gap in a calender. The additional corrosion protection layer serves as the corrosion protection layer of the corrosion protection strip according to the invention in the product produced in this way. For the purposes of the present invention, corrosion protection strips are strip-shaped, mat-shaped, or otherwise flat. The present invention also encompasses strips, mats, or webs, which can optionally be cut to a desired width for the corrosion protection strip. Preference is given to using webs for the production of the corrosion protection strips, preferably with a width of up to 6 m, more preferably with a width of up to 3.5 m.

[0079] The connecting layer serves to connect the carrier layers to one another, but also to easily functionalize the corrosion protection tape so that the corrosion protection tape has additional properties. The connecting layer can optionally provide electrical conductivity. This can also be achieved, for example, by applying an electrically conductive material to a surface of the at least one corrosion protection layer of the first corrosion protection tape before bringing the first and second corrosion protection tapes into contact according to the method according to the invention, which surface is arranged opposite a surface of the at least one corrosion protection layer of the second corrosion protection tape or a surface of the at least one carrier layer. The electrically conductive material can be, for example, a conductive carbon black powder or a metal powder or a metallic or metallized foil, preferably perforated.The conductivity can be provided over the entire length of the strip or at least in sections. An electrically conductive material is preferably embedded in at least one connecting layer. Preferably selected electrically conductive materials have already been described in connection with the formation of the electrical conductivity of the connecting layer and / or the corrosion protection layer. The core materials optionally embedded in the connecting layer and / or corrosion protection layer have also already been described above in connection with the formation of the electrical conductivity. Furthermore, the connecting layer serves to easily adjust different material properties of the various layers of the corrosion protection strip. The connecting layer can, for example, have material properties that differ from the corrosion protection layer of the at least four-layer corrosion protection strip according to the invention.This can be easily achieved in the method according to the invention by adjusting the properties of the corrosion protection layers of the first and second corrosion protection tapes. Preferably, the viscosity and strength of the connecting layer and the corrosion protection layer in the at least four-layer corrosion protection tape according to the invention can thus be adjusted differently. Thus, the connecting layer preferably has a lower viscosity and / or lower strength than the corrosion protection layer.

[0080] Preferably, the at least one first, at least two-layer corrosion protection strip and the at least one second, at least two-layer corrosion protection strip are pressed together by a pressing process. For the purposes of the present invention, pressing processes are understood to be processes which plastically deform a material to be pressed under the action of external forces, thereby causing a targeted change in the external shape of the material to be pressed. Preferably, the at least one first and the at least one second corrosion protection strip are pressed together. Preferably, the present invention uses a pressing process which essentially exerts an external force on a cross-sectional area of ​​a corrosion protection strip. The cross-sectional area of ​​a corrosion protection strip is defined as the area spanned by the width and thickness of the corrosion protection strip.Preferably, the externally acting force is transmitted to a corrosion protection strip by means of at least one roller. The term pressure is used as a synonym for the force transmitted to a corrosion protection strip via the roller in the context of the present invention. More preferably, the pressure is transmitted by means of at least two rollers, preferably an upper roller and a lower roller, which are each in contact with the at least first corrosion protection strip and with the at least second corrosion protection strip. The upper roller and the lower roller define a roll gap which is assigned to a region formed between the upper roller and the lower roller. The at least one first and the at least one second corrosion protection strip run into the roll gap and are pressed together after passing through the roll gap.The compressed corrosion protection strip emerging from the roll gap is a corrosion protection strip according to the invention with at least four layers. More preferably, the pressure is transmitted by means of one, two, three, or more rollers, wherein the rollers can act as a work roll or a backup roll for the work roll. A system of several superimposed rollers is also conceivable as a pressing process. It is also conceivable for the at least one first corrosion protection strip and the at least one second corrosion protection strip entering the roll gap, or for the at least four-layer corrosion protection strip formed after passing through a first roll gap, to pass through two, three, or more roll gaps. It is also conceivable for a rolling system in the form of a calendering process to be used. Preferably, a rubber-coated roller and a steel roller are used as backup rollers in the calendering process.The roll gap preferably has a gap of 0.5 mm to 1.5 mm, more preferably of 0.7 mm to 1.3 mm. The pressing process preferably comprises stretching the at least one first corrosion protection strip, the at least one second corrosion protection strip and / or the corrosion protection strip according to the invention formed thereby. For the purposes of the present invention, the stretching comprises an externally acting force in the longitudinal direction of a corrosion protection strip. The externally acting force during the stretching is preferably a tensile force that pulls a corrosion protection strip in the longitudinal direction. Stretching can take place in particular following the application of pressure to the then formed corrosion protection strip according to the invention, for example in connection with the winding up of the web-shaped product forming the corrosion protection strip according to the invention.

[0081] The strength or thickness of the corrosion protection strip according to the invention can be varied by specifically adjusting the roll gap, the roll pressure, the stretching, or other process variables relating to the pressing process or winding. The strength of the connecting layer or the design of the connecting layer with respect to electrically conductive materials and / or core materials can also be varied by specifically adjusting the roll gap, the roll pressure, the stretching, or other process variables relating to the pressing process or winding.

[0082] In a particularly preferred embodiment for producing the corrosion protection tape according to the invention, the first corrosion protection tape comprises two layers and the second corrosion protection tape comprises three layers. The first corrosion protection tape comprises a carrier layer and a corrosion protection layer. The second corrosion protection tape comprises a carrier layer and two corrosion protection layers such that the carrier layer is arranged between the first and second corrosion protection layers. To produce the corrosion protection tape according to the invention, the first corrosion protection tape and the second corrosion protection tape are brought into contact such that the corrosion protection layer of the first corrosion protection tape is brought into contact with one of the two corrosion protection layers of the second corrosion protection tape.By bringing the first and second corrosion protection strips into contact, the two corrosion protection layers of the first and second corrosion protection strips form a connecting layer after pressure is applied, which is arranged between the carrier layer of the first corrosion protection strip and the carrier layer of the second corrosion protection strip. This nevertheless results in a four-layer corrosion protection strip according to the invention, because by applying pressure, the two contacting corrosion protection layers of the first and second corrosion protection strips form a single-layer connecting layer. This is supported by heating when the pressure is applied, for example by using temperature-controlled rollers, which is generally preferred in the process according to the invention. Temperatures in a range from approximately 25°C to approximately 170°C are preferably used, more preferably in a range from approximately 30°C to approximately 140°C.

[0083] Preferably, the carrier layer of the at least one first and / or the at least one second corrosion protection tape is formed from an at least single-layer carrier, wherein at least one layer of the carrier is designed as a support layer, wherein the support layer is formed from at least one carrier material comprising polyethylene, polypropylene, polyvinyl chloride, thermoplastic elastomers and / or metals, preferably those as described above. Preferably, the at least one corrosion protection layer of the at least one first and / or the at least one second corrosion protection tape comprises a material comprising at least one butyl rubber and / or at least one polyisobutylene, preferably those as described above. Preferably, the at least one first, at least two-layer corrosion protection tape and the at least one second, at least two-layer corrosion protection tape are pressed together by a pressing process as explained above.

[0084] In a further preferred embodiment for producing the corrosion protection tape according to the invention, the first corrosion protection tape comprises three layers and the second corrosion protection tape comprises three layers. The first and second corrosion protection tapes each comprise a carrier layer and two corrosion protection layers, wherein the carrier layer is arranged between the first and second corrosion protection layers of the respective corrosion protection tape. To produce the corrosion protection tape according to the invention, the first corrosion protection tape and the second corrosion protection tape are brought into contact such that one of the two corrosion protection layers of the first corrosion protection tape is brought into contact with one of the two corrosion protection layers of the second corrosion protection tape.By bringing the first and second corrosion protection strips into contact, the two corrosion protection layers of the first and second corrosion protection strips form a connecting layer after pressure is applied, which is arranged between the carrier layer of the first corrosion protection strip and the carrier layer of the second corrosion protection strip. Preferably, the first three-layer corrosion protection strip and the second three-layer corrosion protection strip are pressed together using a pressing process already explained above. This results in a five-layer corrosion protection strip according to the invention, because by applying pressure, the two contacting corrosion protection layers of the first and second corrosion protection strips form a single-layer connecting layer. Here, too, the formation of the connecting layer can be assisted by heating, as described above.

[0085] The present invention further relates to the use of the corrosion protection tape according to the invention for protecting components, in particular pipes, pipelines, tubular objects, pipelines and pipeline components, as well as tanks and components of tanks, as well as other systems and fixtures, against corrosion. The use of the corrosion protection tape in the method for applying the corrosion protection tape according to the invention as described above is particularly preferred.

[0086] The present invention also relates to the use of the corrosion protection tape according to the invention for locating at least one defect in a pipe or pipeline in the region of a weld seam, wherein the connecting layer comprises at least one conductive material and / or core material embedded in the at least one connecting layer, which can be arranged at least in the region of a weld seam of a pipe or pipeline. Preferably, the corrosion protection tape for locating at least one defect in a pipe or pipeline in the region of a weld seam comprises at least one corrosion protection layer comprising a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene. More preferably, the corrosion protection layer comprises at least one conductive material and / or core material embedded in the at least one corrosion protection layer.The corrosion protection tape for locating at least one defect in a pipe or pipeline in the region of a weld seam preferably comprises a support layer of at least one carrier layer, which is formed from at least one carrier material selected from a group comprising polyethylene, polypropylene, polyvinyl chloride, thermoplastic elastomers and / or metals. More preferably, the corrosion protection tape for locating at least one defect in a pipe or pipeline in the region of a weld seam comprises support layers in the at least two carrier layers, which are formed from at least one carrier material selected from a group comprising polyethylene, polypropylene, polyvinyl chloride, thermoplastic elastomers and / or metals. More preferably, the corrosion protection tape for locating at least one defect in a pipe or pipeline in the region of a weld seam comprises two identical carrier layers.According to the invention, an adhesion-promoting layer is arranged on at least one surface of the support layer of at least one of the carrier layers. Adhesive layers are preferably arranged on at least one surface of the support layers of the carrier layers.

[0087] The present invention is explained in more detail with reference to the following examples.

[0088] To produce a corrosion protection tape, a first, two-layer corrosion protection tape and a second, three-layer corrosion protection tape were used. The first, two-layer corrosion protection tape was formed with a three-layer carrier layer, wherein the carrier layer was a support layer with adhesion-promoting layers applied to both opposite surfaces thereof. The support layer of the carrier layer was made of polyethylene. The adhesion-promoting layer consisted of 50 wt.% of an at least partially pre-crosslinked butyl rubber with the properties specified in the above description, 33.33 wt.% of an electron-beam-crosslinkable polyethylene, and 16.67 wt.% of an ethylene-propylene-diene rubber with 5-ethylidene-2-norbornene as the diene, wherein the amounts are based on the total amount of the adhesion-promoting layer, and the components have properties as specified in the above description.The carrier layer was manufactured using a coextrusion process, comprising a base layer and adhesion promoter layers arranged on both surfaces of the base layer. The base layer had a thickness of 0.5 mm, and the adhesion promoter layers each had a thickness of 40 µm.

[0089] The second layer of the first, two-layer corrosion protection tape was designed as a corrosion protection layer made of 30 wt.% polyisobutylene, 10 wt.% butyl rubber, and 60 wt.% powdered mineral filler, each based on the total amount of the corrosion protection layer. The components of the corrosion protection layer exhibited properties as specified in the above description. The corrosion protection layer was arranged on a surface of the carrier layer, adjacent to one of the two adhesion-promoting layers.

[0090] The second, three-layer corrosion protection tape was formed with a three-layer carrier layer, wherein the carrier layer was formed with a support layer and an adhesion-promoting layer applied to both surfaces thereof. The support layer of the carrier layer was made of polyethylene. The adhesion-promoting layer consisted of 50 wt.% of an at least partially pre-crosslinked butyl rubber with the properties specified in the above description, 33.33 wt.% of an electron-beam-crosslinkable polyethylene, and 16.67 wt.% of an ethylene-propylene-diene rubber with 5-ethylidene-2-norbornene as the diene, wherein the amounts are based on the total amount of the adhesion-promoting layer, and the components have properties as specified in the above description. The carrier layer with a support layer and adhesion-promoting layers arranged on both surfaces of the support layer was produced in a coextrusion process.The base layer had a thickness of 0.5 mm, and the adhesion-promoting layers each had a thickness of 40 µm. The second and third layers of the second three-layer corrosion protection tape were designed as corrosion protection layers. These two corrosion protection layers were each arranged on a surface of the carrier layer such that the carrier layer was located between the two corrosion protection layers. The two corrosion protection layers consisted of 30 wt.% of polyisobutylene, 10 wt.% of butyl rubber, and 60 wt.% of a powdered, mineral filler material, each based on the total amount of the corrosion protection layer. The components of the corrosion protection layer have properties as stated in the above description. One of the two corrosion protection layers further comprised a flat, circularly perforated metallized rescue foil, which was embedded in one of the two corrosion protection layers.

[0091] The first two-layer and the second three-layer strips were pressed together in a calendering process using a rubber-coated work roll and a steel counter roll. The roll gap was set to 0.9 mm. The outgoing, pressed corrosion protection strip was further stretched. The two incoming corrosion protection strips were placed on top of each other for pressing such that the carrier layer of the first two-layer corrosion protection strip was in contact with the corrosion protection layer with the embedded electrically conductive material of the second corrosion protection strip. The pressed, outgoing corrosion protection strip formed a connecting layer with embedded electrically conductive material in the form of a metallized, perforated rescue foil between the carrier layer of the first strip and the carrier layer of the second strip.

[0092] An alternative, second example of producing a corrosion protection tape comprises providing a first three-layer corrosion protection tape and a second three-layer corrosion protection tape. The first three-layer corrosion protection tape was formed with a three-layer carrier layer, which was designed like the carrier layer of the first corrosion protection tape from the first example above. The second layer and the third layer of the first three-layer corrosion protection tape were designed as a corrosion protection layer, which was designed like the corrosion protection layer of the first corrosion protection tape from the first example above. The two corrosion protection layers were each arranged on a surface of the carrier layer, adjacent to one of the two adhesion-promoting layers, such that the carrier layer was arranged between the two corrosion protection layers.

[0093] The second, three-layer corrosion protection tape was formed with a three-layer carrier layer, wherein the carrier layer was designed like the carrier layer of the first corrosion protection tape of the first example above. The second and third layers of the second, three-layer corrosion protection tape were designed as corrosion protection layers. The two corrosion protection layers were each arranged on a surface of the carrier layer such that the carrier layer was located between the two corrosion protection layers. The two corrosion protection layers consisted of 30 wt.% of a polyisobutylene, 10 wt.% of a butyl rubber, and 60 wt.% of a powdered, mineral filler material, each based on the total amount of the corrosion protection layer. The components of the corrosion protection layer have properties as specified in the above description.The second layer of the two corrosion protection layers further comprised an RFID system, with RFID transponders being embedded in sections in the second corrosion protection layer in such a way that at least one RFID transponder was available in 15 cm sections along the entire length of the corrosion protection tape.

[0094] The first three-layer and the second three-layer strip were pressed together in a calendering process using a rubber-coated work roll and a steel counter roll. The roll gap was set to 1.0 mm. The pressed corrosion protection strip running out of the roll gap was further stretched. The two corrosion protection strips running into the roll gap were placed on top of each other for pressing such that a corrosion protection layer of the first three-layer corrosion protection strip came into contact with the corrosion protection layer with the embedded electrically conductive material of the second three-layer corrosion protection strip. The pressed, five-layer corrosion protection strip thus formed a connecting layer between the carrier layer of the first strip and the carrier layer of the second strip, consisting of two corrosion protection layers, with the RFID transponder embedded in the connecting layer.

[0095] An alternative, third example of producing a corrosion protection tape comprises providing a first, three-layer corrosion protection tape and a second, two-layer corrosion protection tape. The first, three-layer corrosion protection tape was formed with a three-layer carrier layer, which was designed like the carrier layer of the first corrosion protection tape from the first example above. The second layer and the third layer of the first three-layer corrosion protection tape were designed as corrosion protection layers, which were designed like the corrosion protection layer of the first corrosion protection tape from the first example above. The two corrosion protection layers were each arranged on a surface of the carrier layer, adjacent to one of the two adhesion-promoting layers, such that the carrier layer was arranged between the two corrosion protection layers.

[0096] The second, two-layer corrosion protection tape was constructed with a single-layer carrier layer, with the carrier layer containing a support layer as the only layer. The support layer was designed in a grid pattern, with the carrier material consisting of stainless steel wire and copper wire, making it electrically conductive. The support layer had a thickness of 0.7 mm.

[0097] The second layer of the first, two-layer corrosion protection tape was designed as a corrosion protection layer made of 30 wt.% polyisobutylene, 10 wt.% butyl rubber, and 60 wt.% powdered mineral filler, each based on the total amount of the corrosion protection layer. The components of the corrosion protection layer exhibit properties as specified in the above description.

[0098] The corrosion protection layer was arranged on a surface of the carrier layer, adjacent to the adhesion promoter layer.

[0099] The first, three-layer, and the second, two-layer strips were pressed together in a calendering process using a rubber-coated work roll and a steel counter roll. The roll gap was set to 1.0 mm. The two corrosion protection strips entering the roll gap were placed on top of each other for pressing such that one corrosion protection layer of the first three-layer corrosion protection strip came into contact with the metal mesh carrier layer of the second corrosion protection strip. The pressed, five-layer corrosion protection strip thus formed a connecting layer consisting of only one corrosion protection layer of the first three-layer corrosion protection strip between the carrier layer of the first strip and the electrically conductive carrier layer of the second strip.

[0100] An alternative, fourth example of producing a corrosion protection tape comprises providing a first, three-layer corrosion protection tape and a second, three-layer corrosion protection tape. The first, three-layer corrosion protection tape was formed with a three-layer carrier layer, wherein the carrier layer was formed as a support layer with an adhesion-promoting layer applied to both surfaces thereof. The adhesion-promoting layers consisted of 50 wt.% of an at least partially pre-crosslinked butyl rubber having the properties specified in the above description, 33.33 wt.% of a thermoplastic elastomer TPS-SEBS, and 16.67 wt.% of an ethylene-propylene-diene rubber with 5-ethylidene-2-norbornene as the diene, wherein the amounts are based on the total amount of the adhesion-promoting layer, and the components have properties as specified in the above description.The base layer consisted of a thermoplastic elastomer, namely TPS-SEBS. The carrier layer was manufactured using a coextrusion process, consisting of a base layer and adhesion promoter layers arranged on both surfaces of the base layer. The base layer had a thickness of 0.5 mm, and the adhesion promoter layers were each 40 µm thick.

[0101] The first three-layer corrosion protection tape had two corrosion protection layers, each arranged on a surface of the carrier layer such that the carrier layer was located between the two corrosion protection layers. The two corrosion protection layers consisted of 30 wt.% of a polyisobutylene, 10 wt.% of a butyl rubber, and 60 wt.% of a powdered, mineral filler material, each based on the total amount of one corrosion protection layer. The components of the corrosion protection layer had properties as specified in the above description. One of the two corrosion protection layers further comprised a flat, circularly perforated metallized rescue film embedded in one of the two corrosion protection layers. Alternatively, the metallized rescue film was introduced separately in a calendering process as described below.

[0102] The second three-layer corrosion protection tape was formed with a three-layer carrier layer, wherein the carrier layer was formed as a support layer with an adhesion-promoting layer applied to both surfaces thereof. The adhesion-promoting layers consisted of 50 wt.% of an at least partially pre-crosslinked butyl rubber with the properties specified in the above description, 33.33 wt.% of an electron-beam-crosslinkable polypropylene, and 16.67 wt.% of an ethylene-propylene-diene rubber with 5-ethylidene-2-norbornene as the diene, wherein the amounts are based on the total amount of the adhesion-promoting layer, and the components have properties as specified in the above description. The support layer consisted of a nonwoven made of polypropylene. The support layer had a thickness of 0.4 mm, and the adhesion-promoting layers each had a thickness of 40 µm.

[0103] The second three-layer corrosion protection tape had two corrosion protection layers, each arranged on a surface of the carrier layer such that the carrier layer was positioned between the two corrosion protection layers. The two corrosion protection layers consisted of 30 wt.% polyisobutylene, 10 wt.% butyl rubber, and 60 wt.% of a powdered, mineral filler material, each based on the total amount of the corrosion protection layer. The components of the corrosion protection layer had properties as specified in the above description. One of the two corrosion protection layers further comprised a flat, circularly perforated metallized rescue foil embedded in one of the two corrosion protection layers.

[0104] The first three-layer and the second three-layer strips were pressed together in a calendering process using a rubber-coated work roll and a steel counter roll. The roll gap was set to 1.0 mm. The two corrosion protection strips entering the roll gap were placed on top of each other for pressing such that the corrosion protection layer of the first three-layer corrosion protection strip, with the perforated metallized rescue film embedded in it, came into contact with one of the two corrosion protection layers of the second corrosion protection strip. In the alternative design, the metallized perforated rescue film was inserted separately between the two corrosion protection layers of the first and second corrosion protection strips as they entered the roll gap.The pressed, five-layer corrosion protection tape formed an electrically conductive connecting layer between the carrier layer of the first tape and the carrier layer of the second tape due to the metallized perforated rescue foil, formed from one corrosion protection layer each of the first and the second corrosion protection tape.

Claims

1. Anti-corrosion tape comprising at least four plies, wherein at least two plies of the anti-corrosion tape comprise as carrier plies a carrier that has at least one layer, wherein at least one layer of the carrier is configured as a carrying layer, wherein at least one further ply of the anti-corrosion tape is configured as a connecting ply and comprises at least one connecting layer, wherein the connecting layer comprises a material that comprises at least one butyl rubber and / or at least one polyisobutylene, wherein the at least one connecting ply is disposed between the two carrier plies, and wherein at least one further ply of the anti-corrosion tape is configured as an anti-corrosion ply and is disposed on at least one exposed surface of at least one carrier ply, wherein an adhesion-promoting layer is disposed on at least one surface of the carrying layer of at least one of the carrier plies, wherein the carrying layers of the at least two carrier plies are formed from a carrier material that comprises at least one polyethylene, one polypropylene, one polyvinyl chloride, one thermoplastic elastomer and / or one metal.

2. Anti-corrosion tape according to claim 1, characterized in that the carrying layer of at least one of the carrier plies is configured as a film, a non-woven fabric, a woven fabric, a net, a non-crimp fabric, a knitted fabric, a perforated film or a mesh.

3. Anti-corrosion tape according to one or more of the preceding claims, characterized in that the adhesion-promoting layer comprises an adhesion-promoting composition comprising 20 % by weight to 70 % by weight of at least one polymer that is selected from a group that comprises polyethylenes, polypropylenes, polyvinyl chlorides and / or thermoplastic elastomers; and 20 % by weight to 65 % by weight of at least one butyl rubber; wherein the values in percent by weight are in each case in relation to the total amount of the adhesion-promoting layer, and comprise a tolerance range of ±20 %.

4. Anti-corrosion tape according to one or more of the preceding claims, characterized in that the carrying layer and the at least one adhesion-promoting layer are coextruded.

5. Anti-corrosion tape according to one or more of the preceding claims, characterized in that at least one electrically conductive material and / or at least one core material is disposed in the at least one connecting ply and / or in the at least one anti-corrosion ply and / or in at least one of the at least two carrier plies, wherein the core material is a device that comprises transmitter-receiver systems, sensors, detectors, measuring devices and / or sensing devices.

6. Method for the application of an anti-corrosion tape that is in accordance with one or more of claims 1 to 5 as corrosion protection to pipes, pipelines, tubular objects, piping conduits and piping conduit components, to tanks and components of tanks and to other installations and fixtures by applying the anti-corrosion tape thereto.

7. Method according to claim 6, characterized in that pipes, pipelines, tubular objects, piping conduits and piping conduit components as well as tanks and components of tanks are being wrapped with the anti-corrosion tape.

8. Method for the manufacturing of an anti-corrosion tape that is in accordance with one or more of the claims 1 to 5 by means of applying pressure to at least one first anti-corrosion tape that has at least two plies and to at least one second anti-corrosion tape that has at least two plies, wherein the first and the second anti-corrosion tape comprise at least one carrier ply and at least one anti-corrosion ply, in such a way that the first or the second anti-corrosion tape is brought into contact with the respective other anti-corrosion tape, so that at least one anti-corrosion ply of the first or of the second anti-corrosion tape forms a connecting ply that is disposed between the carrier plies of the at least one first and second anti-corrosion tape, and the at least one further anti-corrosion ply of the first or second anti-corrosion tape forms an outer ply of the anti-corrosion tape.

9. Method according to claim 8, characterized in that the at least one first anti-corrosion tape that has at least two plies and the at least one second anti-corrosion tape that has at least two plies are pressed together by means of a pressing process.

10. Method according to one or more of claims 8 to 9, characterized in that a first anti-corrosion tape that has two layers and a second anti-corrosion tape that has three layers, wherein the first anti-corrosion tape comprises a carrier ply and an anti-corrosion ply and the second anti-corrosion tape comprises a carrier ply and two anti-corrosion plies, wherein the carrier ply of the second anti-corrosion tape is disposed between the two anti-corrosion plies of the same, are brought into contact with each other in such a way that the anti-corrosion ply of the first anti-corrosion tape is associated with one of the two anti-corrosion plies of the second anti-corrosion tape in such a way that they form a connecting ply that is disposed between the carrier plies of the first and second anti-corrosion tapes after applying a pressure to the first and second anti-corrosion tapes.

11. Method according to one or more of claims 8 to 10, characterized in that the carrier ply of the at least one first and / or of the at least one second anti-corrosion tape is being formed from a carrier that has at least one layer, wherein at least one layer of the carrier is configured as a carrying layer, wherein the carrying layer is formed from at least one carrier material that comprises polyethylene, polypropylene, polyvinyl chloride, thermoplastic elastomers and / or metals, and wherein the at least one anti-corrosion ply of the at least one first and / or of the at least one second anti-corrosion tape comprises a material that comprises at least one butyl rubber and / or at least one polyisobutylene.

12. Use of an anti-corrosion tape that is in accordance with one or more of the preceding claims 1 to 5 for the protection against corrosion of pipes, pipelines, tubular objects, piping conduits and piping conduit components as well as of tanks and components of tanks, and of other installations and fixtures.

13. Use of an anti-corrosion tape that is in accordance with one or more of the claims 1 to 5 for the localization of at least one defect in a piping conduit or pipeline in the region of a weld seam, wherein the connecting ply comprises at least one conductive material and / or core material that is embedded in the at least one connecting ply and that can be arranged at least in the region of a weld seam of a piping conduit or pipeline, wherein the core material is a device that comprises transmitter-receiver systems, sensors, detectors, measuring devices and / or sensing devices.