PRIMER FOR ADHESIVE TAPES

Abstract

Primer for adhesive tape with improved adhesion promoting properties, comprising a mixture G, which is dissolved or dispersed in one or more solvents, consisting of at least one copolymer obtained by copolymerization of a monomer mixture comprising an amount of at least 90 wt % of the following monomers: vinylcaprolactam and/or vinylpyrrolidone; one or more of the monomers a) and/or b): a) acrylic acid ester of a linear, primary alcohol having 2 to 10 carbon atoms in the alkyl group of the alcohol, b) acrylic acid ester of a branched, non-cyclic alcohol having 3 to 12 carbon atoms in the alkyl group, at least one chlorinated polyolefin, and at least one metal compound selected from the group consisting of metal acetylacetonates, metal alkoxides and alkoxy-metal acetylacetonates.

Claims

1: Primer comprising a mixture G, in dispersion or solution in one or more solvents, of at least one copolymer obtained by copolymerizing a monomer mixture comprising the following monomers to an extent of at least 90 wt %: vinylcaprolactam and/or vinylpyrrolidone; one or more monomers a) and/or b): a) acrylic esters of a linear primary alcohol having 2 to 10 carbon atoms in the alkyl radical of the alcohol, b) acrylic esters of a branched acyclic alcohol having 3 to 12 carbon atoms in the alkyl radical of the alcohol, at least one chlorinated polyolefin, at least one metal compound selected from the group consisting of metal acetylacetonates, metal alkoxides and alkoxy metal acetylacetonates.

2: Primer according to claim 1, wherein the copolymer is a pressure-sensitive adhesive.

3: Primer according to claim 1, wherein the sum total of the proportions by weight of vinylcaprolactam and vinylpyrrolidone in the monomer mixture is at least 10 wt % and at most 50 wt %, based on the total weight of the monomer mixture.

4: Primer according to claim 1, wherein the monomer mixture comprises n-butyl acrylate.

5: Primer according to claim 1, wherein the metal in the metal compound is selected from the group consisting of titanium, aluminium, zirconium, zinc and iron.

6: Primer according to claim 1, wherein the concentration of the copolymer, based on the total weight of the primer, is from 1 wt % inclusive to 30 wt % inclusive.

7: Primer according to claim 1, wherein the chlorinated polyolefin has been modified with an α,β-unsaturated carboxylic acid or anhydride thereof, and/or with an acrylate.

8: Primer according to claim 1, wherein the primer is free of block copolymers of the polystyrene/polydiene or polystyrene/hydrogenated polydiene type.

9: Primer according to claim 1, wherein the primer additionally contains at least one organofunctional silane of the structure (I)
(R.sup.1O—).sub.xSi(R.sup.2).sub.y(R.sup.3).sub.z  (I) in which the R.sup.1 radicals are each independently a C.sub.1-C.sub.4-alkyl radical, a C.sub.2-C.sub.6-alkoxyalkyl radical or an acyl radical; the R.sup.2 radical is an aminoalkyl radical, a vinyl group, a methacryloyloxyalkyl radical, an isocyanatoalkyl radical, an O-methylcarbamatoalkyl radical, a glycidoxyalkyl radical or a phenyl radical; the R.sup.3 radicals are each independently a C.sub.1-C.sub.18-alkyl radical and x=1, 2 or 3; y=0 or 1 and z=4−x−y.

10: Primer according to claim 1, wherein the primer additionally comprises one or more epoxy resins.

11: Primer according to claim 1, wherein the primer additionally comprises one or more styrene-acrylate resins.

12: Primer according to claim 1, wherein the primer additionally comprises acetylacetone.

13: Primer according to claim 1, wherein the primer comprises one or more fluorescent optical brighteners.

14. (canceled)

15: Method for producing an adhesion-promoting layer on a substrate, comprising the application of a primer claim 1 to a substrate and the removal of the one or more solvents.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0085] FIG. 1 illustrates a ribbed PP/EPDM

[0086] FIG. 2 illustrates the application of an adhesive tape to a ribbed PP/EPDM SUBSTRATE

[0087] Ribbed PP/EPDM (FIG. 1) and an application of adhesive tape thereto (FIG. 2) are shown for illustration in FIGS. 1 and 2. In FIG. 2, the numerals mean: [0088] 1 ribbed PP/EPDM substrate [0089] 2 adhesive tape bonded in longitudinal direction.

[0090] In practice, ribbed PP/EPDM is found to be much more difficult to bond than smooth PP/EPDM. The width of the ribs is about 0.8-1.0 mm, although the surfaces of the ribs are not entirely flat, and so the actual width per rib with which a flat adhesive tape is in contact is much lower. The number of ribs per cm of width is about 5 ribs in each case in standard components. Components of the type described are used frequently in the automotive industry, and there is a requirement to bond these to the ribs by means of adhesive tape applications. This can be achieved by promotion of adhesion with the primers of the invention.

[0091] In one advantageous embodiment, the described effect of improving the adhesion of foamed or foamlike adhesive tapes based on polyacrylates or based on blends of polyacrylates and synthetic rubber can also be achieved on unpretreated polypropylene (PP) in such a way that the adhesive tapes can be removed from the polypropylene after a bonding time of only a few minutes only at the expense of the destruction of the polypropylene itself. This is especially true of adhesive tapes which are designed for permanent, strong bonds and thus have a high internal strength.

[0092] In one advantageous embodiment, the described effect of improving the adhesion of foamed or foamlike adhesive tapes based on polyacrylates or based on blends of polyacrylates and synthetic rubber can be achieved both on the one hand on olefin-based substrates such as PP/EPDM, for example, and on the other hand on substrates such as galvanized steel, PP, ABS and PVC.

[0093] The primers of the invention additionally assure good protection against moisture undermining and against corrosion. In the event of relatively long-term storage periods under hot and humid conditions or under extreme fluctuating conditions, such storage periods frequently being required in the automotive, electronics, and solar industries, as for example incorporating temperatures from 60° C. to 90° C. in tandem with a relative humidity of 80% to 90%, moisture undermining generally takes place. In such cases the moisture migrates either between the substrate and the primer or between the primer and the pressure-sensitive adhesive of the adhesive tape, or between both. The consequence is that the adhesion of the adhesive tape is no longer optimum and it can be unwantedly detached adhesively. Moreover, there may be unwanted corrosion, as for example the formation of zinc oxide under the bond area in the case of a galvanized steel substrate. These unwanted phenomena are prevented or at least distinctly attenuated with the primers of the invention.

[0094] After a number of weeks of storage under hot and humid conditions or under fluctuating conditions, incorporating temperatures of 60° C. to 90° C. in conjunction with relative humidity of greater than or equal to 80% affecting the adhesive tape which is based on polyacrylates or based on blends of polyacrylates and synthetic rubber and has been adhered to the primer-coated substrate, this adhesive tape is detachable predominantly only at the expense of its own destruction, and there is no moisture undermining, or at least a lesser degree of moisture undermining than is the case with the presently known primers.

[0095] The production of an adhesion-promoting layer with the primer of the invention is effected in a known manner, mainly by first applying the primer to a substrate. Subsequently, the solvent(s) is/are allowed to evaporate, and then the adhesive tape can be applied. There may only be a few minutes between application/evaporation of the solvent and the application of the adhesive tape, or else a few days or weeks.

[0096] The invention further provides for the use of the primer of the invention for improving the adhesion of adhesive tapes, especially of adhesive tapes based on polyacrylates or based on blends of polyacrylates and synthetic rubber (styrene block copolymers), on olefin-based substrates, especially on PP/EPDM and PP, more preferably on PP/EPDM; and on galvanized steel, ABS and PVC; more preferably on olefin-based substrates, especially on PP/EPDM and PP, most preferably on PP/EPDM.

EXAMPLES

[0097] The test methods below were used to provide brief characterization of the specimens produced in accordance with the invention:

Dynamic Mechanical Analysis (DMA) for Determining the Storage Modulus G′ and the Loss Modulus G″

[0098] The pressure-sensitive tack of the copolymers present in the primer was characterized by determination of the storage modulus G′ and loss modulus G″ by means of dynamic mechanical analysis (DMA).

[0099] The measurements were made using the DSR 200 N shear stress-controlled rheometer from Rheometric Scientific in an oscillation test with a sinusoidally oscillating shearing stress in a plate/plate arrangement. The storage modulus G′ and the loss modulus G″ were determined in a frequency sweep from 10.sup.−1 to 10.sup.2 rad/sec at a temperature of 23° C. G′ and G″ are defined as follows:

G′=τ/γ.Math.cos(δ)

(τ=shear stress, γ=deformation, δ=phase angle=phase shift between shear stress vector and deformation vector).

G″=τ/γ.Math.sin(δ)

(τ=shear stress, γ=deformation, δ=phase angle=phase shift between shear stress vector and deformation vector).

[0100] The definition for the angular frequency is as follows: ω=2π*f (f=frequency). The unit is rad/sec.

[0101] The thickness of the pressure-sensitive copolymer samples measured was always between 0.9 and 1.1 mm (1+/−0.1 mm). The pressure-sensitive copolymer samples were produced by coating out the copolymers described later on below on a double-sidedly siliconized polyester film (release liner), evaporating the solvent at 70° C., and piling up the resulting 100 μm coats on one another until a thickness of about 1 mm was reached. Subsequently, the samples to be analysed were punched out. The sample diameter was 25 mm in each case. Preliminary tension was applied with a load of 3N. For all of the measurements, the stress of the sample specimens was 2500 Pa.

Bond Strength

[0102] The bond strength was determined in accordance with PSTC-101 at room temperature. In line with this method, the primer was first applied thinly to the substrate. This was done by brush application of the primer to the substrate. Following evaporation of the solvent, the adhesive strip under measurement (the adhesive tape) was applied (adhered) to the substrate now bearing the primer in a layer thickness of approximately 1 μm to 10 μm. To effect this application, a strip of the adhesive tape in a defined width (standard: 20 mm) was bonded to the primer-coated substrate by rolling over it five times with a 5 kg steel roller.

[0103] The time between the last rolling of the adhesive tape and the peel removal was as follows: a) 3 minutes; b) 30 minutes. The peel angle was 900 in each case and the peel rate 300 mm/min. The force required for peel removal is the bond strength, which is reported in the unit N/cm and thus relates to a standardized adhesive tape width of 1 cm. Alongside the bond strength, the nature of adhesive bond failure was ascertained. The adhesive strips measured were reinforced on the reverse with a polyester film that was 23 μm thick and had undergone incipient etching with trichloroacetic acid. All measurements were conducted in a controlled-climate space at 23° C. and 50% relative humidity.

Conditioned Storage

[0104] The assemblies comprising the substrate coated with the primer of the invention and the adhesive tape adhered to that substrate were subjected to storage under selected climatic conditions, in order to determine the climatic robustness of the bond.

Storage a): two-week storage under conditions of 85° C. and 85% relative humidity
Storage b): two-week cycled storage with cycles of 4 hours −40° C., 4 hours heating/cooling, 4 hours 80° C./80% relative humidity.

[0105] After the end of the storage period, the samples, which were reinforced on the reverse with a polyester film having a thickness of 23 μm thick and having been incipiently etched with trichloroacetic acid, were subjected to the bond strength test with a peel angle of 90° in each case and with a peel rate of 300 mm/min, in a controlled-climatic space at 23° C. and 50% relative humidity.

Static Glass Transition Temperature

[0106] The static glass transition temperature was determined via dynamic scanning calorimetry in accordance with DIN 53765. The figures for the glass transition temperature T.sub.g refer to the glass transformation temperature value T.sub.g in accordance with DIN 53765:1994-03, unless indicated otherwise in any specific case. Heating curves run with a heating rate of 10 K/min. The specimens are measured in Al crucibles with a perforated lid under a nitrogen atmosphere. Evaluation takes place on the second heating curve. A glass transition temperature is evident as an inflection point on the thermogram.

Molecular Weights

[0107] The average molecular weight Mw and the average molecular weight M.sub.N, and the polydispersity D, were determined by means of gel permeation chromatography (GPC). The eluent used was THF with 0.1 vol % of trifluoroacetic acid. Measurement took place at 25° C. The precolumn used was a PSS-SDV, 5 μm, 10.sup.3 Å (10.sup.−7 m), ID 8.0 mm×50 mm. Separation took place using the columns PSS-SDV, 5 μm, 10.sup.3 Å, (10.sup.−7 m), 10.sup.5 Å (10.sup.−5 m), and 10.sup.6 Å (10.sup.−4 m), each with ID 8.0 mm×300 mm. The sample concentration was 4 g/l, the flow rate 1.0 ml per minute. Measurement took place against PMMA standards.

Solids Content

[0108] The solids content is a measure of the fraction of unvaporizable constituents in a polymer solution. It is determined gravimetrically, with the solution being weighed, the vaporizable fractions then being evaporated off in a drying cabinet at 120° C. for 2 hours, and the residue being weighed again.

K Value (Fikentscher)

[0109] The K value is a measure of the average molecular size of high-polymer compounds. For the measurement, one percent strength (1 g/100 ml) toluenic polymer solutions were prepared and their kinematic viscosities were determined by means of a VOGEL-OSSAG viscometer. Standardization to the viscosity of toluene gives the relative viscosity, from which the K value can be calculated by the method of Fikentscher (Polymer 8/1967, 381 ff.).

[0110] The substrates used (to which the primer was applied first of all in a thin layer, i.e. in a layer thickness after the vaporization of the solvent of 1 to 10 μm, followed by the adhesive tape being adhered thereto) were as follows: [0111] Substrate 1: PP/EPDM, designation: HX TRC 135X/4 Black, PP/EPDM=blend of polypropylene and EPDM; EPDM=ethylene-propylene-diene rubber, smooth surface, from Basell Bayreuth Chemie GmbH [0112] Substrate 2: VW installable part made from PP/EPDM, designation: VW, TKS, PP-EPDM-MD30, 5NO.854.940.A, complex-shaped component having a partly ribbed surface [0113] Substrate 3: VW installable part made from PP/EPDM, designation: VW, PP-EPDM T10, 2K3 853 535 HL MAXI, complex-shaped component having a partly ribbed surface [0114] Substrate 4: VW installable part made from PP/EPDM, designation: VW, TKS, PP-EPDM-MD30, 1TO.853.718.A, complex-shaped component having a partly ribbed surface [0115] Substrate 5: PP (polypropylene) test specimen, smooth surface, from Rocholl GmbH, [0116] Substrate 6: test specimen made from hot-dip-galvanized galvanized steel (composed of DX51 D+2275), smooth surface, from Rocholl GmbH [0117] Substrate 7: test specimen made from ABS (acrylonitrile-butadiene-styrene copolymer), smooth surface, from Rocholl GmbH [0118] Substrate 8: test specimen made from PVC (polyvinyl chloride), smooth surface, from Rocholl GmbH

[0119] In the case of the complex-shaped installable parts (substrates 2 to 4) having a partly ribbed surface, bonding was always effected on the ribbed part in longitudinal direction, as shown in FIGS. 1 and 2. The primer was first applied thinly to the ribs prior to the adhering of the adhesive tape, as described above. The individual ribs each had a width of about 0.8 to 1 mm, although the surfaces of the ribs were not entirely flat, and so the actual width per rib with which a flat adhesive tape is in contact was much lower. The number of ribs per cm of width was about 5 ribs in each case. The adhesive forces reported are based here too on the standardized adhesive tape width of 1 cm and not on the widths of the individual ribs added up to 1 cm.

[0120] The adhesive tapes (test adhesive tapes) with which the primer was tested were based on pressure-sensitive polyacrylate adhesives and pressure-sensitive adhesives based on an acrylate/synthetic rubber mixture.

[0121] These pressure-sensitive adhesives were produced using the following raw materials:

TABLE-US-00002 Manufac- Trade turer or Chemical compound name supplier CAS No. Bis(4-tert-butylcyclohexyl) Perkadox Akzo 15520-11-3 peroxydicarbonate 16 Nobel 2,2′-Azobis(2-methylpropio- Vazo 64 DuPont 78-67-1 nitrile), AIBN 2,2′-Azobis(2-methylbutyro- Vazo 67 DuPont 13472-08-7 nitrile) Pentaerythritol Polypox UPPC AG 3126-63-4 tetraglycidyl ether R16 3,4-Epoxycyclohexylmethyl 3,4- Uvacure Cytec 2386-87-0 epoxycyclohexanecarboxylate 1500 Industries Inc. Triethylenetetramine Epikure Hexion 112-24-3 925 Speciality Chemicals Microballoons (MB) Expancel Expancel (dry unexpanded microspheres, 051 DU 40 Nobel diameter 9 to 15 μm, Industries expansion onset temperature 106 to 111° C., TMA density ≦25 kg/m.sup.3) Terpene-phenolic resin Dertophene DRT 25359-84-6 (softening point 110° C.; T110 resins M.sub.w = 500 to 800 g/mol) Terpene-phenolic resin Dertophene DRT 25359-84-6 (softening point 105° C.; T105 resins M.sub.w = 500 to 800 g/mol) n-Butyl acrylate n-Butyl Rohm & 141-32-2 acrylate Haas Acrylic acid Glacial BASF 79-10-7 acrylic acid 2-Ethylhexyl acrylate Brenntag 103-11-7 Methyl acrylate BASF 96-33-3 Styrene-butadiene block Kraton Kraton 9003-55-8 copolymer (polystyrene D1118 Polymers content about 31%) Polyoxyethylene(15)cocoamine Ethomeen Akzo 61791-14-8 C/25 Nobel Reofos RDP Tetraphenyl- Chemtura 57583-54-7 resorcinol bis(diphenyl- phosphate)

[0122] The expansion capacity of the microballoons can be described through the determination of the TMA (thermo mechanical analysis) density [kg/m.sup.3] (Stare Thermal Analysis System from Mettler Toledo; heating rate 20° C./min). The TMA density here is the minimum achievable density at a defined temperature T.sub.max under atmospheric pressure before the microballoons collapse.

[0123] The softening point of the resins is determined in accordance with DIN ISO 4625.

[0124] Furthermore, the following solvents were used for preparing the polyacrylate PSAs contained in the test adhesive tapes:

TABLE-US-00003 Designation CAS No. Manufacturer 60/95 special-boiling-point spirit 64742-49-0 Shell, Exxon or naphtha (crude oil), hydrogen-treated, light Acetone 67-64-1 Shell Isopropanol 67-63-0 Shell

Test Adhesive Tape 1 (Single-Layer Acrylate Adhesive Tape)

[0125] An example polyacrylate PSA 1 for producing the test adhesive tape 1 was prepared as follows: A reactor conventional for radical polymerizations was charged with 54.4 kg of 2-ethylhexyl acrylate, 20.0 kg of methyl acrylate, 5.6 kg of acrylic acid, and 53.3 kg of acetone/isopropanol (94:6). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 40 g of Vazo 67, in solution in 400 g of acetone, were added. Thereafter the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After one hour a further 40 g of Vazo 67, in solution in 400 g of acetone, were added, and after four hours the batch was diluted with 10 kg of acetone/isopropanol mixture (94:6).

[0126] After five hours and again after seven hours, initiation was repeated with 120 g each time of bis(4-tert-butylcyclohexyl) peroxydicarbonate, in each case in solution in 400 g of acetone. After a reaction time of 22 hours, the polymerization was discontinued and the batch was cooled to room temperature. The product had a solids content of 55.9% and was freed from the solvent in a concentrating extruder under reduced pressure (residual solvent content ≦0.3 mass percent). The resulting polyacrylate had a K value of 58.8, an average molecular weight of Mw=746 000 g/mol, a polydispersity of D (Mw/Mn)=8.9, and a static glass transition temperature of T.sub.g=−35.6° C.

[0127] This base polymer was melted in a feeder-extruder (single-screw conveying extruder from TROESTER GmbH & Co. Kg, Germany) and in the form of a polymer melt was conveyed with said extruder, via a heatable hose, into a planetary roller extruder from Entex (Bochum). The melted resin Dertophene T 110 was then added via a metering port, to give the melt a resin concentration of 28.3 mass percent. Additionally, the crosslinker Polypox R16 was added. Its concentration in the melt was 0.14 mass percent. All components were mixed to give a homogeneous polymer melt.

[0128] Using a melt pump and a heatable hose, the polymer melt was transferred to a twin-screw extruder (from Berstorff). There the accelerator Epikure 925 was added. Its concentration in the melt was 0.14 mass percent. The entire polymer mixture was then freed from all gas inclusions in a vacuum dome under a pressure of 175 mbar. After the vacuum zone, the microballoons were metered in and were incorporated homogeneously into the polymer mixture by means of a mixing element. Their concentration in the melt was 0.7 mass percent. The resulting melt mixture was transferred into a die.

[0129] Following exit from the die, in other words after a drop in pressure, the incorporated microballoons underwent expansion, with the drop in pressure producing shear-free cooling of the polymer composition. This gave a foamed polyacrylate PSA, which was subsequently shaped to web form in a thickness of 0.8 mm by means of a roll calender, and was lined with a double-sidedly siliconized release film (50 μm, polyester), while the chemical crosslinking reaction proceeded. After winding, the film was stored at room temperature for four weeks before being used further for primer testing. The wound film is test adhesive tape 1.

Test Adhesive Tape 2 (Three-Layer Acrylate Adhesive Tape)

[0130] An example polyacrylate PSA 2A for producing the test adhesive tape 2 was prepared as follows:

[0131] A reactor conventional for radical polymerizations was charged with 30.0 kg of 2-ethylhexyl acrylate, 67.0 kg of butyl acrylate, 3.0 kg of acrylic acid, and 66.7 kg of acetone/isopropanol (96:4). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 50 g of Vazo 67, in solution in 500 g of acetone, were added. Thereafter the external heating bath was heated to 70° C. and the reaction was carried out constantly at this external temperature. After one hour a further 50 g of Vazo 67, in solution in 500 g of acetone, were added, and after two hours the batch was diluted with 10 kg of acetone/isopropanol mixture (96:4). After 5.5 hours, 150 g of bis(4-tert-butylcyclohexyl) peroxydicarbonate, in solution in 500 g of acetone, were added; after 6 hours 30 minutes, dilution was repeated with 10 kg of acetone/isopropanol mixture (96:4). After 7 hours, a further 150 g of bis(4-tert-butylcyclohexyl) peroxydicarbonate, in solution in 500 g of acetone, were added, and the heating bath was set to a temperature of 60° C.

[0132] After a reaction time of 22 hours, the polymerization was discontinued and the batch was cooled to room temperature. The product had a solids content of 50.2% and was dried. The resulting polyacrylate had a K value of 75.2, an average molecular weight of Mw=1 370 000 g/mol, a polydispersity of D (Mw/Mn)=17.13, and a static glass transition temperature of T.sub.g=−38.0° C.

[0133] This base polymer was melted in a feeder-extruder (single-screw conveying extruder from TROESTER GmbH & Co. Kg, Germany) and in the form of a polymer melt was conveyed with said extruder, via a heatable hose, into a planetary roller extruder from Entex (Bochum). Additionally, the crosslinker Polypox R16 was then added via a metering port. Its concentration in the melt was 0.22 mass percent. All components were mixed to give a homogeneous polymer melt.

[0134] Using a melt pump and a heatable hose, the polymer melt was transferred to a twin-screw extruder (from Berstorff). There the accelerator Epikure 925 was added. Its concentration in the melt was 0.14 mass percent. The entire polymer mixture was then freed from all gas inclusions in a vacuum dome under a pressure of 175 mbar. After the vacuum zone, the microballoons were metered in and were incorporated homogeneously into the polymer mixture by means of a mixing element. Their concentration in the melt was 2.0 mass percent. The resulting melt mixture was transferred into a die.

[0135] Following exit from the die, in other words after a drop in pressure, the incorporated microballoons underwent expansion, with the drop in pressure producing shear-free cooling of the polymer composition. This gave the foamed polyacrylate PSA 2A, which was subsequently shaped to web form in a thickness of 0.8 mm by means of a roll calender, and was lined with a double-sidedly siliconized release film (50 μm, polyester), while the chemical crosslinking reaction proceeded. The wound film was stored at room temperature for a day before further processing (see below).

[0136] An example polyacrylate PSA 2B for producing the two outer layers of the three-layer test adhesive tape 2 was prepared as follows:

[0137] A 100 l glass reactor conventional for radical polymerizations was charged with 4.8 kg of acrylic acid, 11.6 kg of butyl acrylate, 23.6 kg of 2-ethylhexyl acrylate, and 26.7 kg of acetone/60/95 special-boiling-point spirit (1:1). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 30 g of AlBN were added. Thereafter the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After a reaction time of 1 hour, a further 30 g of AlBN were added. After 4 hours and again after 8 hours, dilution was carried out with 10.0 kg each time of acetone/60/95 special-boiling-point spirit (1:1) mixture. To reduce the residual initiators, 90 g portions of bis(4-tert-butylcyclohexyl) peroxydicarbonate were added after 8 hours and again after 10 hours. After a reaction time of 24 hours, the reaction was discontinued and the batch was cooled to room temperature. The polyacrylate was subsequently blended with 0.2 mass percent of the crosslinker Uvacure® 1500, then diluted to a solids content of 30% with acetone, and subsequently coated from solution onto a double-sidedly siliconized release film (50 μm, polyester). (Coating speed 2.5 m/min, drying tunnel 15 μm, temperatures zone 1: 40° C., zone 2: 70° C., zone 3: 95° C., zone 4: 105° C.). The thickness was 50 μm. After winding, the film was stored at room temperature for 2 days, before being used further to produce the test adhesive tape 2.

[0138] A film of the polyacrylate PSA 2B was laminated onto both sides of the foamed film of polyacrylate PSA 2A. Immediately prior to the laminating of the film of polyacrylate PSA 2B onto the foamed film of polyacrylate PSA 2A, the respective surface of the film of polyacrylate PSA 2A to be laminated was subjected to air corona pretreatment with a corona dose of 35 Wmin/m.sup.2. Prior to the second lamination, the double-sidedly siliconized release film of the foamed polyacrylate PSA 2A was lined. After the second lamination, one of the double-sidedly siliconized release films of the two foamed polyacrylate PSAs 2B was lined as well. The 3-layer assembly composed of polyacrylate PSA 2B/polyacrylate PSA 2A/polyacrylate PSA 2B was wound up and stored at room temperature for four weeks before being further used for primer testing. The wound assembly is test adhesive tape 2.

[0139] The polyacrylate PSAs of test adhesive tapes 1 and 2, as described by way of example in terms of their composition and production methodology, are described comprehensively in DE 10 2010 062 669. The disclosure content of that specification is incorporated explicitly into the disclosure content of this invention.

Test Adhesive Tape 3 (One-Layer Adhesive Tape Based on an Acrylate/Synthetic Rubber Mixture)

[0140] An example polyacrylate PSA 3 for producing the test adhesive tape 3 was prepared as follows:

[0141] A reactor conventional for radical polymerizations was charged with 72.0 kg of 2-ethylhexyl acrylate, 20.0 kg of methyl acrylate, 8.0 kg of acrylic acid, and 66.6 kg of acetone/isopropanol (94:6). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 50 g of AlBN, in solution in 500 g of acetone, were added. Thereafter the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After one hour a further 50 g of AlBN, in solution in 500 g of acetone, were added, and after four hours the batch was diluted with 10 kg of acetone/isopropanol mixture (94:6).

[0142] After five hours and again after seven hours, initiation was repeated with 150 g each time of bis(4-tert-butylcyclohexyl) peroxydicarbonate, in each case in solution in 500 g of acetone. After a reaction time of 22 hours, the polymerization was discontinued and the batch was cooled to room temperature. The product had a solids content of 55.8% and was freed from the solvent in a concentrating extruder under reduced pressure (residual solvent content ≦0.3 mass percent). The resulting polyacrylate had a K value of 58.9, an average molecular weight of Mw=748 000 g/mol, a polydispersity of D (Mw/Mn)=8.9, and a static glass transition temperature of T.sub.g=−35.2° C.

[0143] The mixture with the synthetic rubber was produced as follows:

[0144] In a planetary roller extruder, by means of a solids metering system, the synthetic rubber Kraton D1118 in the form of granules was melted. This was followed by the addition of a microballoon paste (50% Expancel 051DU40 in Ethomeen C25). By means of a side feeder, the polyacrylate base polymer was fed in, having been pre-melted in a single-screw extruder, and a terpene-phenolic resin (Dertophen DT105) was metered in. Added to the mixture were crosslinker solution (Polypox R16 15% in Rheofos RDP) and accelerator solution (15% Epicure 925 in Rheofos RDP). The melt was mixed thoroughly and coated using a two-roll calender between two release films (siliconized PET film). The result was a one-layer adhesive tape having a layer thickness of 1000 μm and a density of 550 kg/m.sup.3. This adhesive tape is test adhesive tape 3. The composition was 48% polyacrylate, 25% Kraton D1118, 18% Dertophen DT105, 4% crosslinker/accelerator solution (crosslinker:accelerator=1:1), 5% microballoon paste (figures in wt %).

[0145] The copolymer present in the primer in accordance with the invention was produced using the following raw materials:

TABLE-US-00004 Trade Manufac- Chemical compound name turer CAS No. N-Vinylcaprolactam Sigma- 2235-00-9 Aldrich N-Vinyl-2-pyrrolidon Sigma- 88-12-0 Aldrich n-Butyl acrylate n-Butyl Rohm & 141-32-2 acrylate Haas 2-Ethylhexyl acrylate Brenntag 103-11-7 Bis(4-tert-butylcyclohexyl) Perkadox Akzo 15520-11-3 peroxydicarbonate 16 Nobel 2,2′-Azobis(2-methylpropio- Vazo 64 DuPont 78-67-1 nitrile), AIBN

[0146] In addition, the following solvents were used for production of the copolymer present in the primer in accordance with the invention:

TABLE-US-00005 Designation CAS No. Manufacturer 60/95 special-boiling-point spirit 64742-49-0 Shell, Exxon or naphtha (mineral oil), hydrogen-treated, light Acetone 67-64-1 Shell

[0147] The polyacrylate PSAs for use as a constituent in the primer of the invention were prepared as follows:

Primer PSA 1

[0148] A 100 l glass reactor conventional for radical polymerizations was charged with 12.0 kg of N-vinylcaprolactam, 28.0 kg of n-butyl acrylate, and 26.7 kg of acetone/60/95 special-boiling-point spirit (1:1). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 30 g of AlBN were added. Thereafter the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After a reaction time of 1 hour, a further 30 g of AlBN were added. After 4 hours and again after 8 hours, dilution took place with 10.0 kg of acetone/60/95 special-boiling-point spirit (1:1) mixture each time. To reduce the residual initiators, 90 g portions of bis(4-tert-butylcyclohexyl) peroxydicarbonate were added after 8 hours and again after 10 hours. After a reaction time of 24 hours, the reaction was discontinued and the batch was cooled to room temperature. The polyacrylate was diluted to a solids content of 40.0 mass percent with acetone. The solution thus obtained is primer PSA 1.

Primer PSA 2

[0149] A 100 l glass reactor conventional for radical polymerizations was charged with 8.0 kg of N-vinylcaprolactam, 32.0 kg of 2-ethylhexyl acrylate, and 26.7 kg of acetone/60/95 special-boiling-point spirit (1:1). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 30 g of AlBN were added. Thereafter the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After a reaction time of one hour, a further 30 g of AlBN were added. After 4 hours and again after 8 hours, dilution took place with 10.0 kg of acetone/60/95 special-boiling-point spirit (1:1) mixture each time. To reduce the residual initiators, 90 g portions of bis(4-tert-butylcyclohexyl) peroxydicarbonate were added after 8 hours and again after 10 hours. After a reaction time of 24 hours, the reaction was discontinued and the batch was cooled to room temperature. The polyacrylate was diluted to a solids content of 40.0 mass percent with acetone. The solution thus obtained is primer PSA 2.

Primer PSA 3

[0150] A 100 l glass reactor conventional for radical polymerizations was charged with 8.0 kg of N-vinyl-2-pyrrolidone, 32 kg of butyl acrylate, and 26.7 kg of acetone/60/95 special-boiling-point spirit (1:1). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 30 g of AlBN were added. Thereafter the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After a reaction time of one hour, a further 30 g of AlBN were added. After 4 hours and again after 8 hours, dilution took place with 10.0 kg of acetone/60/95 special-boiling-point spirit (1:1) mixture each time. To reduce the residual initiators, 90 g portions of bis(4-tert-butylcyclohexyl) peroxydicarbonate were added after 8 hours and again after 10 hours. After a reaction time of 24 hours, the reaction was discontinued and the batch was cooled to room temperature. The polyacrylate was diluted to a solids content of 40.0 mass percent with acetone. The solution thus obtained is primer PSA 3.

Primer PSA 4 for Comparative Examples

[0151] A 100 l glass reactor conventional for radical polymerizations was charged with 15.4 kg of butyl acrylate, 24.4 kg of 2-ethylhexyl acrylate, and 26.7 kg of acetone/60/95 special-boiling-point spirit (1:1). After nitrogen gas had been passed through the reactor for 45 minutes, with stirring, the reactor was heated to 58° C. and 30 g of AlBN were added. Thereafter the external heating bath was heated to 75° C. and the reaction was carried out constantly at this external temperature. After a reaction time of one hour, a further 30 g of AlBN were added. After 4 hours and again after 8 hours, dilution took place with 10.0 kg of acetone/60/95 special-boiling-point spirit (1:1) mixture each time. To reduce the residual initiators, 90 g portions of bis(4-tert-butylcyclohexyl) peroxydicarbonate were added after 8 hours and again after 10 hours. After a reaction time of 24 hours, the reaction was discontinued and the batch was cooled to room temperature. The polyacrylate was diluted to a solids content of 40.0 mass percent with acetone. The solution thus obtained is primer PSA 4.

[0152] Primer PSAs 1 to 4 were briefly characterized by DMA measurements. The G′ and G″ curves of primer PSAs 1 to 4, within the deformation frequency range from 10.sup.0 to 10.sup.1 rad/sec at 23° C., were always situated completely within the range from 10.sup.3 to 10.sup.7 Pa. To prepare the primers of the invention, the primer PSAs described above in terms of their preparation and composition, and also the following raw materials, were used:

TABLE-US-00006 Chemical compound/ Manufac- description Trade turer or (manufacturer data) name supplier CAS No. Chlorinated polyolefin, Hardlen Toyobo 560096-07-3 chlorine content: 20%, F 6P (95%), M.sub.w = 50 000, 3101-60-8 (5%) maleic anhydride-modified, (manufacturer maleic anhydride data) content: 2.0% Chlorinated polyolefin, Hardlen Toyobo 68442-33-1 chlorine content: 26%, DX 526 P (94%) M.sub.w = 100 000 3101-60-8 (5%) 67-66-3 (<1%) (manufacturer data) Hydroxyl-containing Desmophen Bayer polystyrene acrylate, A 365 about 65% in butyl BA/X 65% acetate/xylene 26:9 Epoxy resin based on Epikote Hexion 25068-38-6 bisphenol A, mean 828 molecular weight <700 3-Glycidoxypropyl- Geniosil ® Wacker 2530-83-8 trimethoxysilane GF 80 Chemie Vinyltrimethoxysilane Geniosil ® Wacker 2768-02-7 XL 10 Chemie Titanium tetraisopropoxide Tyzor ® Lehmann 546-68-9 TPT & Voss Tetra-n-butyl titanate Tyzor ® Lehmann 5593-70-4 TnBT &Voss Bis(acetylacetonato) Tyzor ® Lehmann 97281-09-9 isobutyl AA-95 & Voss isopropyl titanate Tetra-n-butyl zirconate Tyzor ® Lehmann 1071-76-7 NBZ & Voss Acetylacetone Sigma- 123-54-6 Aldrich

[0153] For preparation of further examples, the primers of the invention were modified with the following raw materials:

TABLE-US-00007 Chemical compound/ description Manufacturer (manufacturer data) Trade name or supplier SBS block copolymer Kraton ® D 1102 E Kraton Polymers Hydrogenated SEBS block Kraton ® G 1652 E Kraton Polymers copolymer

[0154] In addition, the following solvents were used for production of the primers of the invention:

TABLE-US-00008 Manufacturer Name CAS No. or supplier Cyclohexane 110-82-7 Brenntag Xylene 106-42-3 Biesterfeld Ethylbenzene 100-41-4 Alfa Aesar Acetone 67-64-1 Shell 60/95 special-boiling-point spirit 64742-49-0 Shell, Exxon or naphtha (mineral oil), hydrogen-treated, light Isopropanol 67-63-0 Shell Ethyl acetate 141-78-6 Brenntag

[0155] In addition, the following fluorescent optical brighteners were also used:

TABLE-US-00009 Chemical compound/ Manufac- description Trade turer or (manufacturer data) name supplier CAS No. 2,5-Thiophenediylbis(5-tert- Tinopal BASF 7128-64-5 butyl-1,3-benzoxazole) OB ®

[0156] The raw materials/components specified in the examples were mixed with an IKA® laboratory stirrer system using a propeller stirrer for about two hours. First of all, the respective solvents were mixed, then the chlorinated polyolefin was dissolved therein by stirring for about one hour. The further raw materials were then mixed in individually. In those examples in which acetylacetone was used, the addition and stirring thereof directly followed the dissolution of the chlorinated polyolefin.

Example 1

Composition of the Primer:

[0157]

TABLE-US-00010 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TPT 0.50 Solvents Cyclohexane 41.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

TABLE-US-00011 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 60.2 (C)  64.1 (C)  62.9 (C)  60.5 (C)  (one-layer smooth) AC) 1 2 (PP/EPDM 5.6 (C) 5.5 (C) 5.2 (C) 5.9 (C) ribbed) 1 3 (PP/EPDM 5.6 (C) 5.4 (C) 5.9 (C) 5.8 (C) ribbed) 1 4 (PP/EPDM 6.3 (C) 6.0 (C) 6.9 (C) 6.3 (C) ribbed) 1 5 (PP) 8.0 (A) 9.9 (A) 7.0 (A) 8.4 (A) 1 6 (hot-dip- 40.8 (50% C) 45.3 (60% C) 36.8 (40% C) 49.1 (60% C) galvanized steel) 1 7 (ABS) 34.5 (30% C) 45.2 (60% C) 37.5 (40% C) 47.8 (60% C) 1 8 (PVC) 35.2 (30% C) 41.9 (50% C) 39.2 (40% C) 44.8 (50% C) 2 1 (PP/EPDM 63.2 (C)  66.3 (C)  64.2 (C)  65.9 (C)  (three-layer smooth) AC) 2 2 (PP/EPDM 6.6 (C) 6.9 (C) 6.9 (C) 7.0 (C) ribbed) 2 3 (PP/EPDM 6.2 (C) 6.4 (C) 6.4 (C) 6.8 (C) ribbed) 2 4 (PP/EPDM 6.7 (C) 6.7 (C) 6.6 (C) 6.7 (C) ribbed) 2 5 (PP) 9.1 (A) 9.7 (A) 8.1 (A) 9.9 (A) 2 6 (hot-dip- 44.1 (50% C) 45.9 (60% C) 43.8 (50% C) 47.9 (60% C) galvanized steel) 2 7 (ABS) 44.0 (40% C) 49.1 (70% C) 47.2 (50% C) 48.1 (50% C) 2 8 (PVC) 45.2 (40% C) 51.9 (50% C) 43.0 (40% C) 48.9 (50% C) 3 1 (PP/EPDM 55.2 (C)  57.4 (C)  56.5 (C)  54.1 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM 5.2 (C) 5.6 (C) 5.6 (C) 5.5 (C) ribbed) 3 3 (PP/EPDM 5.6 (C) 5.7 (C) 5.9 (C) 5.2 (C) ribbed) 3 4 (PP/EPDM 6.1 (C) 6.0 (C) 6.6 (C) 6.2 (C) ribbed) 3 5 (PP) 10.0 (A)  12.9 (A)  9.3 (A) 10.9 (A)  3 6 (hot-dip- 47.4 (50% C) 55.6 (70% C) 48.2 (50% C) 51.3 (60% C) galvanized steel) 3 7 (ABS) 39.3 (30% C) 45.3 (60% C) 38.9 (30% C) 44.3 (50% C) 3 8 (PVC) 35.1 (30% C) 41.2 (50% C) 36.1 (40% C) 41.9 (50% C) (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate

Example 2

Composition of the Primer:

[0158]

TABLE-US-00012 Weight percent Raw material/component Primer PSA 2 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TPT 0.50 Solvents Cyclohexane 41.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0159] The primer was tested in the following combinations, giving the following results:

TABLE-US-00013 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 58.6 (C)  61.9 (C)  62.3 (C)  55.5 (C)  (one-layer smooth) AC) 1 2 (PP/EPDM 4.7 (C) 4.6 (C) 4.2 (C) 4.4 (C) ribbed) 1 3 (PP/EPDM 4.3 (C) 4.4 (C) 4.3 (C) 4.1 (C) ribbed) 1 4 (PP/EPDM 4.9 (C) 4.7 (C) 4.9 (C) 4.8 (C) ribbed) 1 5 (PP) 7.5 (A) 8.1 (A) 8.0 (A) 8.2 (A) 1 6 (hot-dip- 36.7 (40% C) 35.9 (40% C) 35.1 (40% C) 39.9 (50% C) galvanized steel) 1 7 (ABS) 36.1 (30% C) 40.7 (50% C) 42.5 (40% C) 46.1 (50% C) 1 8 (PVC) 39.2 (40% C) 39.9 (50% C) 43.1 (40% C) 40.9 (40% C) 2 1 (PP/EPDM 59.9 (C)  61.4 (C)  62.1 (C)  62.8 (C)  (three-layer smooth) AC) 2 2 (PP/EPDM 5.1 (C) 5.9 (C) 5.9 (C) 5.1 (C) ribbed) 2 3 (PP/EPDM 5.7 (C) 5.9 (C) 5.0 (C) 5.9 (C) ribbed) 2 4 (PP/EPDM 5.0 (C) 5.6 (C) 5.2 (C) 5.9 (C) ribbed) 2 5 (PP) 5.1 (A) 6.7 (A) 7.9 (A) 6.5 (A) 2 6 (hot-dip- 42.9 (40% C) 49.5 (50% C) 46.3 (50% C) 45.3 (50% C) galvanized steel) 2 7 (ABS) 50.2 (50% C) 53.4 (70% C) 49.0 (50% C) 47.3 (50% C) 2 8 (PVC) 46.2 (40% C) 48.8 (50% C) 44.0 (40% C) 47.3 (50% C) 3 1 (PP/EPDM 55.2 (C)  57.4 (C)  56.5 (C)  54.1 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM 5.2 (C) 5.6 (C) 5.6 (C) 5.5 (C) ribbed) 3 3 (PP/EPDM 5.6 (C) 5.7 (C) 5.9 (C) 5.2 (C) ribbed) 3 4 (PP/EPDM 6.1 (C) 6.0 (C) 6.6 (C) 6.2 (C) ribbed) 3 5 (PP) 9.2 (A) 10.5 (A)  9.9 (A) 11.2 (A)  3 6 (hot-dip- 37.2 (30% C) 45.8 (40% C) 38.9 (30% C) 40.3 (50% C) galvanized steel) 3 7 (ABS) 46.3 (50% C) 49.3 (60% C) 48.3 (40% C) 49.1 (50% C) 3 8 (PVC) 35.7 (30% C) 39.2 (50% C) 39.1 (40% C) 40.6 (50% C) (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate

Example 3

Composition of the Primer:

[0160]

TABLE-US-00014 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TnBT 0.50 Solvents Cyclohexane 41.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0161] The primer was tested in the following combinations, giving the following results:

TABLE-US-00015 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 59.4 (C)  63.8 (C)  58.9 (C)  63.3 (C)  (one-layer smooth) AC) 1 2 (PP/EPDM 5.9 (C) 6.2 (C) 5.4 (C) 5.5 (C) ribbed) 1 3 (PP/EPDM 5.6 (C) 6.0 (C) 5.0 (C) 5.3 (C) ribbed) 1 4 (PP/EPDM 6.8 (C) 7.2 (C) 6.9 (C) 6.6 (C) ribbed) 1 5 (PP) 10.8 (A)  11.5 (A)  nd nd 1 6 (hot-dip- 42.1 (50% C) 45.9 (50% C) nd nd galvanized steel) 1 7 (ABS) 41.5 (50% C) 49.2 (60% C) nd nd 1 8 (PVC) 40.7 (50% C) 51.9 (60% C) nd nd 3 1 (PP/EPDM 52.1 (C)  55.1 (C)  54.1 (C)  52.6 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM 4.8 (C) 4.8 (C) 5.2 (C) 5.1 (C) ribbed) 3 3 (PP/EPDM 4.7 (C) 4.9 (C) 4.9 (C) 5.2 (C) ribbed) 3 4 (PP/EPDM 4.3 (C) 4.9 (C) 5.9 (C) 4.8 (C) ribbed) 3 5 (PP) 12.5 (A)  13.6 (A)  nd nd 3 6 (hot-dip- 37.2 (40% C) 45.0 (50% C) nd nd galvanized steel) 3 7 (ABS) 42.3 (50% C) 48.0 (50% C) nd nd 3 8 (PVC) 45.5 (50% C) 47.1 (50% C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 4

Composition of the Primer:

[0162]

TABLE-US-00016 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TPT 1.00 Geniosil GF 80 0.50 Solvents Cyclohexane 40.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0163] The primer was tested in the following combinations, giving the following results:

TABLE-US-00017 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 58.2 (C)  59.8 (C)  59.9 (C)  65.1 (C)  (one-layer smooth) AC) 1 2 (PP/EPDM 5.5 (C) 6.9 (C) 5.4 (C) 5.5 (C) ribbed) 1 3 (PP/EPDM 5.3 (C) 6.8 (C) 5.0 (C) 5.3 (C) ribbed) 1 4 (PP/EPDM 6.5 (C) 6.1 (C) 6.0 (C) 7.4 (C) ribbed) 1 5 (PP) 30.9 (50% C) 42.5 (50% C) nd nd 1 6 (hot-dip- 62.1 (C)  65.0 (C)  nd nd galvanized steel) 1 7 (ABS) 49.2 (60% C) 49.9 (60% C) nd nd 1 8 (PVC) 44.7 (50% C) 51.1 (60% C) nd nd 3 1 (PP/EPDM 49.1 (C)  51.4 (C)  54.9 (C)  54.3 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM 4.1 (C) 5.0 (C) 5.1 (C) 4.5 (C) ribbed) 3 3 (PP/EPDM 4.8 (C) 5.7 (C) 4.4 (C) 4.9 (C) ribbed) 3 4 (PP/EPDM 4.4 (C) 4.9 (C) 5.0 (C) 4.7 (C) ribbed) 3 5 (PP) 25.9 (30% C) 33.1 (40% C) nd nd 3 6 (hot-dip- 47.9 (50% C) 47.0 (50% C) nd nd galvanized steel) 3 7 (ABS) 44.1 (50% C) 46.0 (50% C) nd nd 3 8 (PVC) 44.5 (50% C) 45.1 (50% C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 5

Composition of the Primer:

[0164]

TABLE-US-00018 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TnBT 1.00 Geniosil GF 80 0.50 Solvents Cyclohexane 40.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0165] The primer was tested in the following combinations, giving the following results:

TABLE-US-00019 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 59.7 (C)  62.1 (C)  60.3 (C)  60.9 (C)  (one-layer smooth) AC) 1 2 (PP/EPDM 5.7 (C) 5.9 (C) 5.9 (C) 5.6 (C) ribbed) 1 3 (PP/EPDM 5.8 (C) 5.9 (C) 5.2 (C) 5.5 (C) ribbed) 1 4 (PP/EPDM 6.0 (C) 6.9 (C) 6.6 (C) 6.1 (C) ribbed) 1 5 (PP) 35.2 (50% C) 39.2 (50% C) nd nd 1 6 (hot-dip- 65.1 (C)  67.9 (C)  nd nd galvanized steel) 1 7 (ABS) 50.2 (60% C) 52.5 (60% C) nd nd 1 8 (PVC) 48.6 (50% C) 47.1 (50% C) nd nd 3 1 (PP/EPDM 55.3 (C)  53.4 (C)  56.7 (C)  55.1 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM 5.1 (C) 5.8 (C) 5.8 (C) 5.2 (C) ribbed) 3 3 (PP/EPDM 5.2 (C) 5.4 (C) 5.9 (C) 6.5 (C) ribbed) 3 4 (PP/EPDM 5.4 (C) 5.9 (C) 6.3 (C) 6.2 (C) ribbed) 3 5 (PP) 35.2 (50% C) 43.1 (50% C) nd nd 3 6 (hot-dip- 43.3 (50% C) 47.6 (50% C) nd nd galvanized steel) 3 7 (ABS) 41.8 (50% C) 47.2 (50% C) nd nd 3 8 (PVC) 54.2 (50% C) 55.6 (50% C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 6

Composition of the Primer:

[0166]

TABLE-US-00020 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Acetylacetone 0.50 Solvents Cyclohexane 40.60 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0167] The primer was tested in the following combinations, giving the following results:

TABLE-US-00021 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 61.6 (C)  63.5 (C)  60.8 (C)  61.3 (C)  (one-layer smooth) AC) 1 2 (PP/EPDM 6.1 (C) 6.6 (C) 6.2 (C) 6.0 (C) ribbed) 1 3 (PP/EPDM 5.9 (C) 6.3 (C) 6.4 (C) 6.2 (C) ribbed) 1 4 (PP/EPDM 6.3 (C) 6.9 (C) 6.7 (C) 5.1 (C) ribbed) 1 5 (PP) 25.5 (30% C) 29.1 (30% C) nd nd 1 6 (hot-dip- 64.1 (C)  65.6 (C)  nd nd galvanized steel) 1 7 (ABS) 56.3 (90% C) 59.5 (90% C) nd nd 1 8 (PVC) 58.2 (90% C) 56.9 (90% C) nd nd 3 1 (PP/EPDM 57.1 (C)  54.3 (C)  54.1 (C)  53.5 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM 5.5 (C) 5.7 (C) 4.2 (C) 4.6 (C) ribbed) 3 3 (PP/EPDM 5.5 (C) 5.1 (C) 5.2 (C) 6.7 (C) ribbed) 3 4 (PP/EPDM 5.0 (C) 6.9 (C) 6.0 (C) 4.2 (C) ribbed) 3 5 (PP) 55.8 (90% C) 59.2 (90% C) nd nd 3 6 (hot-dip- 42.5 (50% C) 46.2 (50% C) nd nd galvanized steel) 3 7 (ABS) 51.3 (70% C) 58.9 (90% C) nd nd 3 8 (PVC) 55.2 (80% C) 59.1 (90% C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 7

Composition of the Primer:

[0168]

TABLE-US-00022 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Geniosil GF 80 0.50 Acetylacetone 0.50 Solvents Cyclohexane 40.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0169] The primer was tested in the following combinations, giving the following results:

TABLE-US-00023 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 60.4 (C) 64.1 (C) 62.3 (C)  65.1 (C)  (one-layer smooth) AC) 1 2 (PP/EPDM  5.3 (C)  5.6 (C) 5.1 (C) 5.9 (C) ribbed) 1 3 (PP/EPDM  5.1 (C)  6.2 (C) 5.3 (C) 5.4 (C) ribbed) 1 4 (PP/EPDM  5.6 (C)  5.2 (C) 5.9 (C) 5.0 (C) ribbed) 1 5 (PP) 57.9 (90% C) 59.2 (90% C) nd nd 1 6 (hot-dip- 62.5 (C) 66.1 (C) nd nd galvanized steel) 1 7 (ABS) 59.1 (90% C) 60.3 (C) nd nd 1 8 (PVC) 60.3 (C) 63.2 (C) nd nd 3 1 (PP/EPDM 59.3 (C) 62.3 (C) 55.7 (C)  57.2 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.1 (C)  5.9 (C) 5.3 (C) 5.2 (C) ribbed) 3 3 (PP/EPDM  5.1 (C)  5.9 (C) 5.3 (C) 5.6 (C) ribbed) 3 4 (PP/EPDM  5.3 (C)  5.4 (C) 5.1 (C) 5.2 (C) ribbed) 3 5 (PP) 59.1 (90% C) 62.6 (C) nd nd 3 6 (hot-dip- 60.4 (C) 61.0 (C) nd nd galvanized steel) 3 7 (ABS) 61.4 (C) 59.2 (C) nd nd 3 8 (PVC) 59.3 (90% C) 60.4 (C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 8

Composition of the Primer:

[0170]

TABLE-US-00024 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Acetylacetone 0.50 Solvents Cyclohexane 37.50 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0171] The primer was tested in the following combinations, giving the following results:

TABLE-US-00025 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 62.3 (C) 64.9 (C) 63.1 (C)  59.4 (C)  (one-layer AC) smooth) 1 2 (PP/EPDM  5.6 (C)  5.9 (C) 5.2 (C) 5.2 (C) ribbed) 1 3 (PP/EPDM  5.4 (C)  5.2 (C) 5.3 (C) 5.7 (C) ribbed) 1 4 (PP/EPDM  4.8 (C)  4.9 (C) 5.2 (C) 5.3 (C) ribbed) 1 5 (PP) 57.2 (90% C) 60.9 (C) nd nd 1 6 (hot-dip- 59.3 (90% C) 62.1 (C) nd nd galvanized steel) 1 7 (ABS) 56.3 (90% C) 62.3 (C) nd nd 1 8 (PVC) 62.4 (C) 65.1 (C) nd nd 3 1 (PP/EPDM 59.3 (C) 62.3 (C) 56.7 (C)  52.3 (C)  (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.4 (C)  6.3 (C) 6.1 (C) 6.9 (C) ribbed) 3 3 (PP/EPDM  5.9 (C)  5.9 (C) 5.4 (C) 5.7 (C) ribbed) 3 4 (PP/EPDM  5.8 (C)  5.5 (C) 5.6 (C) 6.0 (C) ribbed) 3 5 (PP) 59.6 (C) 61.3 (C) nd nd 3 6 (hot-dip- 62.4 (C) 66.2 (C) nd nd galvanized steel) 3 7 (ABS) 64.1 (C) 60.3 (C) nd nd 3 8 (PVC) 62.7 (C) 63.0 (C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 9

[0172] Composition of the Primer:

TABLE-US-00026 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Tinopal OB 0.15 Solvents Cyclohexane 37.15 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0173] The primer was tested in the following combinations, giving the following results:

TABLE-US-00027 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 63.6 (C) 64.3 (C) 63.7 (C) 60.9 (C) (one-layer smooth) AC) 1 2 (PP/EPDM  5.8 (C)  6.8 (C)  6.4 (C)  6.1 (C) ribbed) 1 3 (PP/EPDM  5.3 (C)  5.9 (C)  5.9 (C)  6.7 (C) ribbed) 1 4 (PP/EPDM  5.4 (C)  5.6 (C)  5.4 (C)  5.8 (C) ribbed) 1 5 (PP) 60.5 (C) 63.8 (C) 62.7 (C) 63.1 (C) 1 6 (hot-dip- 59.9 (C) 65.2 (C) 64.6 (C) 63.3 (C) galvanized steel) 1 7 (ABS) 62.3 (C) 66.1 (C) 64.1 (C) 63.1 (C) 1 8 (PVC) 62.6 (C) 62.8 (C) 64.7 (C) 63.3 (C) 3 1 (PP/EPDM 59.9 (C) 61.7 (C) 59.6 (C) 62.4 (C) (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.6 (C)  6.5 (C)  6.5 (C)  7.3 (C) ribbed) 3 3 (PP/EPDM  6.2 (C)  6.9 (C)  6.8 (C)  6.7 (C) ribbed) 3 4 (PP/EPDM  6.2 (C)  6.5 (C)  6.9 (C)  6.4 (C) ribbed) 3 5 (PP) 62.2 (C) 64.0 (C) 62.1 (C) 64.6 (C) 3 6 (hot-dip- 63.0 (C) 66.9 (C) 64.3 (C) 65.1 (C) galvanized steel) 3 7 (ABS) 65.3 (C) 62.1 (C) 66.1 (C) 62.4 (C) 3 8 (PVC) 62.9 (C) 65.4 (C) 64.1 (C) 65.0 (C) (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 10

Composition of the Primer:

[0174]

TABLE-US-00028 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 2.00 Geniosil GF 80 1.00 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 1.00 Tinopal OB 0.15 Solvents Cyclohexane 35.00 Xylene 19.70 Ethylbenzene 5.00 Acetone 6.65 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0175] The primer was tested in the following combinations, giving the following results:

TABLE-US-00029 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 64.1 (C) 65.1 (C) 60.3 (C) 62.8 (C) (one-layer smooth) AC) 1 2 (PP/EPDM  5.3 (C)  5.3 (C)  5.7 (C)  5.1 (C) ribbed) 1 3 (PP/EPDM  5.0 (C)  5.3 (C)  4.6 (C)  4.9 (C) ribbed) 1 4 (PP/EPDM  5.1 (C)  5.7 (C)  5.3 (C)  5.9 (C) ribbed) 1 5 (PP) 59.2 (C) 60.1 (C) 60.8 (C) 64.3 (C) 1 6 (hot-dip- 62.3 (C) 66.0 (C) 62.7 (C) 65.1 (C) galvanized steel) 1 7 (ABS) 61.6 (C) 64.3 (C) 63.2 (C) 60.6 (C) 1 8 (PVC) 60.7 (C) 61.9 (C) 63.6 (C) 61.4 (C) 3 1 (PP/EPDM 62.3 (C) 64.8 (C) 62.0 (C) 62.5 (C) (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.7 (C)  5.9 (C)  5.5 (C)  5.0 (C) ribbed) 3 3 (PP/EPDM  5.3 (C)  5.2 (C)  5.3 (C)  5.6 (C) ribbed) 3 4 (PP/EPDM  5.7 (C)  5.9 (C)  5.8 (C)  5.4 (C) ribbed) 3 5 (PP) 61.4 (C) 63.2 (C) 61.9 (C) 63.7 (C) 3 6 (hot-dip- 60.0 (C) 64.3 (C) 64.3 (C) 63.2 (C) galvanized steel) 3 7 (ABS) 62.1 (C) 64.7 (C) 65.2 (C) 61.6 (C) 3 8 (PVC) 61.2 (C) 63.6 (C) 66.6 (C) 64.2 (C) (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 11

Composition of the Primer:

[0176]

TABLE-US-00030 Weight percent Raw material/component Primer PSA 2 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Tinopal OB 0.15 Solvents Cyclohexane 37.15 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0177] The primer was tested in the following combinations, giving the following results:

TABLE-US-00031 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 1 1 (PP/EPDM 59.8 (C)  63.1 (C)  nd nd (one-layer smooth) AC) 1 2 (PP/EPDM 6.2 (C) 6.4 (C) nd nd ribbed) 1 3 (PP/EPDM 6.1 (C) 6.8 (C) nd nd ribbed) 1 4 (PP/EPDM 6.2 (C) 6.7 (C) nd nd ribbed) 1 5 (PP) nd nd nd nd 1 6 (hot-dip- nd nd nd nd galvanized steel) 1 7 (ABS) nd nd nd nd 1 8 (PVC) nd nd nd nd 3 1 (PP/EPDM 62.1 (C)  65.6 (C)  nd nd (one-layer smooth) AC/SBS) 3 2 (PP/EPDM 5.3 (C) 5.9 (C)  5.1 (C)  5.6 (C) ribbed) 3 3 (PP/EPDM 5.9 (C) 6.0 (C) nd nd ribbed) 3 4 (PP/EPDM 5.5 (C) 6.0 (C) nd nd ribbed) 3 5 (PP) 59.2 (90% C) 59.9 (90% C) 58.2 (90% C) 60.6 (90% C) 3 6 (hot-dip- 61.2 (C)  64.6 (C)  64.0 (C) 65.3 (C) galvanized steel) 3 7 (ABS) 61.4 (C)  64.6 (C)  nd nd 3 8 (PVC) 60.8 (C)  62.6 (C)  nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 12

Composition of the Primer:

[0178]

TABLE-US-00032 Weight percent Raw material/component Primer PSA 3 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Tinopal OB 0.15 Solvents Cyclohexane 37.15 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0179] The primer was tested in the following combinations, giving the following results:

TABLE-US-00033 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 3 1 (PP/EPDM 60.7 (C) 63.2 (C) nd nd (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.9 (C)  6.1 (C)  6.0 (C)  6.3 (C) ribbed) 3 5 (PP) 57.4 (90% C) 59.3 (90% C) 54.1 (80% C) 55.6 (80% C) 3 6 (hot-dip- 63.6 (C) 61.7 (C) 63.2 (C) 60.6 (C) galvanized steel) 3 8 (PVC) 61.7 (C) 62.9 (C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 13

Composition of the Primer:

[0180]

TABLE-US-00034 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TnBT 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Solvents Cyclohexane 37.30 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0181] The primer was tested in the following combinations, giving the following results:

TABLE-US-00035 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 3 1 (PP/EPDM 62.6 (C) 65.1 (C) nd nd (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.6 (C)  5.9 (C)  5.2 (C)  5.6 (C) ribbed) 3 5 (PP) 56.6 (80% C) 60.1 (90% C) 55.9 (80% C) 50.3 (80% C) 3 6 (hot-dip- 61.9 (C) 65.6 (C) 61.7 (C) 62.3 (C) galvanized steel) 3 8 (PVC) 64.7 (C) 65.6 (C) nd nd (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 14

Composition of the Primer:

[0182]

TABLE-US-00036 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor AA-95 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Solvents Cyclohexane 37.30 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0183] The primer was tested in the following combinations, giving the following results:

TABLE-US-00037 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 3 1 (PP/EPDM 61.7 (C) 62.6 (C) nd nd (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.1 (C)  5.8 (C)  5.4 (C)  5.2 (C) ribbed) 3 5 (PP) 43.7 (50% C) 48.3 (60% C) 49.6 (60% C) 40.1 (50% C) 3 6 (hot-dip- 63.6 (C) 66.8 (C) 63.7 (C) 65.6 (C) galvanized steel) (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 15

Composition of the Primer:

[0184]

TABLE-US-00038 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor NBZ 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Solvents Cyclohexane 37.30 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0185] The primer was tested in the following combinations, giving the following results:

TABLE-US-00039 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 3 1 (PP/EPDM 59.6 (C) 61.7 (C) nd nd (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  5.9 (C)  6.7 (C)  6.2 (C)  6.3 (C) ribbed) 3 5 (PP) 53.6 (70% C) 54.9 (70% C) 55.9 (80% C) 56.6 (90% C) 3 6 (hot-dip- 61.2 (C) 65.7 (C) 60.6 (C) 62.4 (C) galvanized steel) (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 16

Composition of the Primer:

[0186]

TABLE-US-00040 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Geniosil XL 10 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Solvents Cyclohexane 37.30 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0187] The primer was tested in the following combinations, giving the following results:

TABLE-US-00041 Bonding force Bonding force after (300 mm/min) (N/cm) conditioned storage (N/cm) Test adhe- after after a) 2 wks. 85° C./ sive tape Substrate 3 min 30 min 85% rel. humidity b) 2 wks. cycle 3 1 (PP/EPDM 62.7 (C) 65.6 (C) nd nd (one-layer smooth) AC/SBS) 3 2 (PP/EPDM  6.5 (C)  6.9 (C)  6.4 (C)  6.8 (C) ribbed) 3 5 (PP) 55.7 (80% C) 57.6 (90% C) 58.6 (90% C) 56.3 (80% C) 3 6 (hot-dip- 65.1 (C) 63.6 (C) 62.3 (C) 65.1 (C) galvanized steel) (C) = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) A = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Comparative Example 1

Composition of the Comparative Primer:

[0188]

TABLE-US-00042 Weight percent Raw material/component Primer PSA 4 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TPT 0.50 Solvents Cyclohexane 41.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0189] The comparative primer was tested in the following combinations, giving the following results:

TABLE-US-00043 Bonding force (300 mm/min) (N/cm) after after Test adhesive tape Substrate 3 min 30 min 3 1 (PP/EPDM 4.1 (A) 5.2 (A) (one-layer AC/SBS) smooth) 3 2 (PP/EPDM 1.7 (A) 1.9 (A) ribbed) 3 5 (PP) 5.6 (A) 6.3 (A) 3 6 (hot-dip- 5.4 (A) 5.7 (A) galvanized steel) C = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Comparative Example 2

Composition of the Comparative Primer:

[0190]

TABLE-US-00044 Weight percent Raw material/component Primer PSA 4 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TnBT 0.50 Solvents Cyclohexane 41.10 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0191] The comparative primer was tested in the following combinations, giving the following results:

TABLE-US-00045 Bonding force (300 mm/min) (N/cm) after after Test adhesive tape Substrate 3 min 30 min 3 1 (PP/EPDM 6.3 (A) 7.6 (A) (one-layer AC/SBS) smooth) 3 2 (PP/EPDM 1.5 (A) 1.8 (A) ribbed) 3 5 (PP) 4.9 (A) 5.2 (A) 3 6 (hot-dip- 5.1 (A) 5.6 (A) galvanized steel) C = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 17

Composition of the Primer:

[0192]

TABLE-US-00046 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TPT 0.50 Kraton ® D 1102 E 0.50 Solvents Cyclohexane 40.60 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0193] The primer was tested in the following combinations, giving the following results:

TABLE-US-00047 Bonding force (300 mm/min) (N/cm) after after after Test adhesive tape Substrate 3 min 30 min 24 hours 1 1 (PP/EPDM 21.4 (A)  23.6 (A)  24.1 (A)  (one-layer AC) smooth) 1 2 (PP/EPDM 2.3 (A) 3.2 (A) 3.7 (A) ribbed) 1 3 (PP/EPDM 2.2 (A) 2.9 (A) 3.0 (A) ribbed) 1 4 (PP/EPDM 2.4 (A) 2.8 (A) 3.0 (A) ribbed) 3 1 (PP/EPDM 24.2 (A)  25.8 (A)  26.8 (A)  (one-layer AC/SBS) smooth) 3 2 (PP/EPDM 2.2 (A) 2.6 (A) 3.2 (A) ribbed) 3 3 (PP/EPDM 2.3 (A) 3.1 (A) 3.2 (A) ribbed) 3 4 (PP/EPDM 2.5 (A) 3.3 (A) 3.8 (A) ribbed) C = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate

Example 18

Composition of the Primer:

[0194]

TABLE-US-00048 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen DX 526 P 1.50 Tyzor TPT 0.50 Kraton ® G 1652 E 0.50 Solvents Cyclohexane 40.60 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0195] The primer was tested in the following combinations, giving the following results:

TABLE-US-00049 Bonding force (300 mm/min) (N/cm) after after after Test adhesive tape Substrate 3 min 30 min 24 hours 1 1 (PP/EPDM 22.2 (A)  23.8 (A)  24.6 (A)  (one-layer AC) smooth) 1 2 (PP/EPDM 2.4 (A) 2.6 (A) 2.7 (A) ribbed) 1 3 (PP/EPDM 2.3 (A) 2.9 (A) 3.1 (A) ribbed) 1 4 (PP/EPDM 2.4 (A) 2.6 (A) 3.9 (A) ribbed) 3 1 (PP/EPDM 23.9 (A)  25.2 (A)  25.8 (A)  (one-layer AC/SBS) smooth) 3 2 (PP/EPDM 2.4 (A) 2.7 (A) 3.0 (A) ribbed) 3 3 (PP/EPDM 2.4 (A) 3.0 (A) 3.1 (A) ribbed) 3 4 (PP/EPDM 2.5 (A) 3.1 (A) 3.5 (A) ribbed) C = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate

Example 19

Composition of the Primer:

[0196]

TABLE-US-00050 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Kraton ® D 1102 E 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Tinopal OB 0.15 Solvents Cyclohexane 36.65 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0197] The primer was tested in the following combinations, giving the following results:

TABLE-US-00051 Bonding force (300 mm/min) (N/cm) after after after Test adhesive tape Substrate 3 min 30 min 24 hours 1 1 (PP/EPDM 25.7 (A)  28.2 (A)  28.9 (A)  (one-layer AC) smooth) 1 2 (PP/EPDM 3.0 (A) 3.3 (A) 3.6 (A) ribbed) 1 3 (PP/EPDM 3.1 (A) 3.2 (A) 3.7 (A) ribbed) 1 4 (PP/EPDM 3.2 (A) 3.8 (A) 4.0 (A) ribbed) 3 1 (PP/EPDM 24.9 (A)  26.3 (A)  26.9 (A)  (one-layer AC/SBS) smooth) 3 2 (PP/EPDM 2.6 (A) 2.6 (A) 3.1 (A) ribbed) 3 3 (PP/EPDM 2.7 (A) 3.0 (A) 3.2 (A) ribbed) 3 4 (PP/EPDM 2.9 (A) 3.5 (A) 3.9 (A) ribbed) C = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

Example 20

Composition of the Primer:

[0198]

TABLE-US-00052 Weight percent Raw material/component Primer PSA 1 (solids content 40 percent by weight) 10.40 Hardlen F6 P 1.50 Tyzor TPT 0.50 Kraton ® G 1652 E 0.50 Geniosil GF 80 0.50 Desmophen A 365 2.60 Epikote 828 0.20 Acetylacetone 0.50 Tinopal OB 0.15 Solvents Cyclohexane 36.65 Xylene 19.70 Ethylbenzene 5.00 Acetone 7.00 Petroleum 3.70 Isopropanol 9.10 Ethyl acetate 2.00 Total 100.00

[0199] The primer was tested in the following combinations, giving the following results:

TABLE-US-00053 Bonding force (300 mm/min) (N/cm) after after after Test adhesive tape Substrate 3 min 30 min 24 hours 1 1 (PP/EPDM 25.3 (A)  27.8 (A)  27.9 (A)  (one-layer AC) smooth) 1 2 (PP/EPDM 2.0 (A) 3.6 (A) 3.8 (A) ribbed) 1 3 (PP/EPDM 2.9 (A) 2.9 (A) 3.2 (A) ribbed) 1 4 (PP/EPDM 2.6 (A) 2.9 (A) 3.6 (A) ribbed) 3 1 (PP/EPDM 25.1 (A)  26.7 (A)  27.8 (A)  (one-layer AC/SBS) smooth) 3 2 (PP/EPDM 2.4 (A) 2.9 (A) 3.6 (A) ribbed) 3 3 (PP/EPDM 2.6 (A) 3.0 (A) 3.1 (A) ribbed) 3 4 (PP/EPDM 2.1 (A) 2.3 (A) 3.0 (A) ribbed) C = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined

[0200] The primer was tested in the following combinations, giving the following results:

TABLE-US-00054 Bonding force (300 mm/min) (N/cm) after after after Test adhesive tape Substrate 3 min 30 min 24 hours 1 1 (PP/EPDM 25.3 (A)  27.8 (A)  27.9 (A)  (one-layer AC) smooth) 1 2 (PP/EPDM 2.0 (A) 3.6 (A) 3.8 (A) ribbed) 1 3 (PP/EPDM 2.9 (A) 2.9 (A) 3.2 (A) ribbed) 1 4 (PP/EPDM 2.6 (A) 2.9 (A) 3.6 (A) ribbed) 3 1 (PP/EPDM 25.1 (A)  26.7 (A)  27.8 (A)  (one-layer AC/SBS) smooth) 3 2 (PP/EPDM 2.4 (A) 2.9 (A) 3.6 (A) ribbed) 3 3 (PP/EPDM 2.6 (A) 3.0 (A) 3.1 (A) ribbed) 3 4 (PP/EPDM 2.1 (A) 2.3 (A) 3.0 (A) ribbed) C = cohesive split of the adhesive tape (percentage relates to the cohesive proportion; no percentage = 100% C) (A) = adhesive detachment of the adhesive tape from the primer or of the primer from the substrate nd = not determined