Pigmentable Primer

Abstract

The invention relates to a primer for improving the adhesion of adhesive tapes to hydrophilic surfaces, such as, in particular, glass or ceramic. The primer according to the invention comprises, dissolved or dispersed in one or more solvents, a mixture G of at least one copolymer obtained by copolymerization of a monomer mixture comprising to at least 90 wt. % the following monomers: vinylcaprolactam and/or vinylpyrrolidone and one or more of the monomers a) and b): c) acrylic acid ester of a linear, primary alcohol having 2 to 10 carbon atoms in the alkyl radical of the alcohol, d) acrylic acid ester of a branched, non-cyclic alcohol having 3 to 12 carbon atoms in the alkyl radical of the alcohol, at least one organofunctional silane of the general structure (Ia) or (Ib)

(R.sup.1O—).sub.xSi(CH.sub.2OR.sup.2).sub.y(R.sup.3).sub.z  (Ia)

(R.sup.1O—).sub.xSi(CH.sub.2NHR.sup.2).sub.y(R.sup.3).sub.z  (Ib), wherein the radicals R.sup.1 independently of each other represent a C.sub.1-C.sub.4-alkyl radical, a C.sub.2-C.sub.6-alkoxyalkyl radical or an acetyl radical; the radicals R.sup.2 independently of each other represent an organic radical; the radicals R.sup.3 independently of each other represent a C.sub.1-C.sub.18-alkyl radical and x=1, 2 or 3; y=1, 2 or 3; x+y≦4 and z=4−x−y; at least one metal compound selected from the group consisting of metal acetylacetonates, metal alkoxides and alkoxy-metal acetylacetonates, at least one amine.

Claims

1. A primer composition comprising, one or more solvents having dissolved or dispersed therein a mixture G which comprises the following constituents: at least one copolymer obtained by copolymerization of a monomer mixture comprising to at least 90 wt. % the following monomers: vinylcaprolactam and/or vinylpyrrolidone and one or more of the monomers a) and b): b) acrylic acid ester of a linear, primary alcohol having 2 to 10 carbon atoms in the alkyl radical of the alcohol, c) acrylic acid ester of a branched, non-cyclic alcohol having 3 to 12 carbon atoms in the alkyl radical of the alcohol, at least one organofunctional silane of the general structure (Ia) or (Ib)
(R.sup.1O—).sub.xSi(CH.sub.2OR.sup.2).sub.y(R.sup.3).sub.z  (Ia)
(R.sup.1O—).sub.xSi(CH.sub.2NHR.sup.2).sub.y(R.sup.3).sub.z  (Ib), wherein the radicals R.sup.1 independently of each other represent a C.sub.1-C.sub.4-alkyl radical, a C.sub.2-C.sub.6-alkoxyalkyl radical or an acetyl radical; the radicals R.sup.2 independently of each other represent an organic radical; the radicals R.sup.3 independently of each other represent a C.sub.1-C.sub.18-alkyl radical and x=1, 2 or 3; y=1, 2 or 3; x+y≦4 and z=4−x−y; at least one metal compound selected from the group consisting of metal acetylacetonates, metal alkoxides and alkoxy-metal acetylacetonates, and, at least one amine.

2. The primer according to claim 1, in which the copolymer is a pressure-sensitive adhesive.

3. The primer according to claim 1, wherein the sum of the weight contents of vinylcaprolactam and vinylpyrrolidone in the monomer mixture is 10 to 50 wt. %, based on the total weight of the monomer mixture.

4. The primer according to claim 1, wherein the monomer mixture comprises a maximum of 1.0 wt. % of acrylic acid, based on the total weight of the monomer mixture.

5. The primer according to claim 1, wherein the monomer mixture comprises n-butyl acrylate.

6. The primer according to claim 1, wherein the content of the copolymer, based on the total weight of the primer, is 1 to 30 wt. %.

7. The primer according to claim 1, wherein the at least one organofunctional silane is one or more of: N-cyclohexylaminomethyltriethoxysilane (CAS no.: 26495-91-0), methacryloxymethylmethyldimethoxysilane (CAS no.: 121177-93-3), methacryloxymethyltrimethoxysilane (CAS no.: 54586-78-6), N-trimethoxysilylmethyl-O-methyl carbamate (CAS no. 23432-64-6) and N-dimethoxy(methyl)silylmethyl-O-methyl carbamate (CAS no.: 23432-65-7).

8. The primer according to claim 1, wherein the metal of the metal compound is selected from the group consisting of: titanium, aluminium, zirconium, zinc and iron.

9. The primer according to claim 1, wherein the at least one amine contains no Si—O-alkyl group.

10. The primer according to claim 1, wherein the at least one amine is a primary amine.

11. The primer according to claim 1, wherein the weight content of the total of all the metal compounds in the mixture G is greater than the weight content of the total of all of the amines.

12. The primer according to claim 1, wherein the one or more solvents have boiling points of less than or equal to 100° C. under normal pressure.

13. A method of producing an adhesion-promoting layer, the method comprising the steps of: applying a primer according to claim 1 onto a substrate, and subsequently removing the one or more solvents.

14. The method according to claim 13, wherein the adhesion-promoting layer is a pigmented adhesion-promoting layer.

15. A substrate having applied thereto a mixture G of the primer composition according to claim 1.

Description

EXAMPLES SECTION

[0097] The following test methods were employed to characterize the samples produced according to the invention.

[0098] Dynamic Mechanical Analysis (DMA) for Determination of the Storage Modulus G′ and the Loss Modulus G″

[0099] To characterize the pressure-sensitive tackiness of the copolymers contained in the primer, determinations of the storage modulus G′ and the loss modulus G″ were carried out by means of dynamic mechanical analysis (DMA).

[0100] The measurements were carried out with the DSR 200 N rheometer of controlled shear stress from Rheometric Scientific in an oscillation test under a sinusoidally oscillating shear stress in a plate-plate arrangement. The storage modulus G′ and the loss modulus G″ were determined in the frequency sweep of from 10.sup.−1 to 10.sup.2 rad/sec at a temperature of 23° C. G′ and G″ are defined as follows:

[0101] G′=τ/γ.Math.cos(δ) (τ=shear stress, γ=deformation, δ=phase angle=phase shift between the shear stress and deformation vector).

[0102] G″=τ/γ.Math.sin(δ) (τ=shear stress, γ=deformation, δ=phase angle=phase shift between the shear stress and deformation vector).

[0103] The definition of the angular frequency is: ω=2π*f (f=frequency). The unit is rad/sec.

[0104] The thickness of the copolymer samples of pressure-sensitive tackiness measured was always between 0.9 and 1.1 mm (1+/−0.1 mm). The copolymer samples of pressure-sensitive tackiness were produced by spreading out the copolymers described below on to a double-sided siliconized polyester film (release liner), evaporating off the solvent at 70° C. and laying the 100 μm thick spread-out layers obtained in this way on top of one another until a thickness of approx. 1 mm was reached. The sample diameter was in each case 25 mm. Pretensioning was performed with a load of 3 N. The stress on the test specimens was 2,500 Pa for all the measurements.

[0105] Splitting of the Foam

[0106] The time until splitting of the foam occurs was determined by repeated measurements of the adhesive strength in accordance with PSTC-101 after specified times at room temperature using the acrylate foam test adhesive tapes 1-4 described below. In this method the primer was first applied thinly to the substrate (the base). This was carried out by brushing the primer on to the substrate. After the solvent had evaporated off a 7 to 25 mm wide strip of the adhesive tape was applied (stuck on) to the substrate which had now been provided with the primer in a layer thickness of from approximately 5 μm to 20 μm. The strip stuck on was then rolled over mechanically ten times by a 5 kg steel roller.

[0107] The time between the last rolling over of the adhesive tape and the peeling off was: a) 15 minutes, b) 30 minutes, c) 1 hour, d) 12 hours, e) 24 hours, f) 48 hours. The peel-off angle was in each case 90°, the peel-off rate was 300 mm/min. The time from when splitting of the foam occurs during peeling off was determined. The adhesive strength was always higher than 20 N/cm at this point in time. The adhesive strips measured were reinforced on the reverse with a 23 μm thick polyester film etched superficially with trichloroacetic acid. All the measurements were performed in a climatically controlled room at 23° C. and 50% relative atmospheric humidity. Glass plates and ceramic tiles served as the substrate.

[0108] Climate Storage

[0109] The composites of the substrates coated with the primer according to the invention and the acrylate foam test adhesive tapes 1 to 4, described below, stuck on to these were subjected to storage under selected climatic conditions in order to determine the climatic resistance of the bonding.

[0110] Storage a): storage for two weeks in a climate of 85° C. and 85% relative atmospheric humidity;

[0111] Storage b): storage for two weeks in an alternating climate with cycles of 4 hours at −40° C., 4 hours heating up/cooling, 4 hours at 80° C./80% relative atmospheric humidity.

[0112] After the storage time had elapsed the samples reinforced on the reverse with a 23 μm thick polyester film superficially etched with trichloroacetic acid were subjected to the adhesive strength test at a peel-off angle of in each case 90° and a peel-off rate of 300 mm/min in a climatically controlled room at 23° C. and 50% relative atmospheric humidity. The nature of the failure of the adhesive bond was determined. The adhesive strength in this context was always higher than 20 N/cm.

[0113] Transmission Measurement with a UV/VIS Spectrometer

[0114] The light transmission was measured with the UVIKON 923 UV/VIS spectrometer from Kontron in the wavelength range of from 190 to 850 nm.

[0115] Static Glass Transition Temperature

[0116] The static glass transition temperature is determined via dynamic differential scanning calorimetry in accordance with DIN 53765. The data on the glass transition temperature T.sub.g relate to the glass transition temperature value T.sub.g according to DIN 53765:1994-03, unless stated otherwise in the individual case. The heating up curves run with a heating rate of 10 K/min. The samples are measured in Al crucibles with a perforated lid under a nitrogen atmosphere. The second heating up curve is evaluated. A glass transition temperature is detectable as a point of inflection in the thermogram.

[0117] Molecular Weights

[0118] The determination of the average molecular weight Mw or of the average molecular weight M.sub.N and of the polydispersity D was carried out by means of gel permeation chromatography (GPC). THF with 0.1 vol. % of trifluoroacetic acid was employed as the eluent. The measurement was performed at 25° C. PSS-SDV, 5 μm, 103 Å (10-7 m), ID 8.0 mm×50 mm was used as the precolumn. The columns PSS-SDV, 5 μm, 103 Å (10-7 m), 105 Å (10-5 m) and 106 Å (10-4 m) of in each case ID 8.0 mm×300 mm were employed for the separation. The sample concentration was 4 g/l, the flow rate was 1.0 ml per minute. Measurement was made against PMMA standards.

[0119] Solids Content

[0120] The solids content is a measure of the content of non-vaporizable constituents in a polymer solution. It is determined gravimetrically by weighing the solution, subsequently evaporating off the vaporizable contents for 2 hours at 120° C. in a drying cabinet and reweighing the residue.

[0121] K Value (According to FIKENTSCHER)

[0122] The K value is a measure of the average molecular size of highly polymeric substances. For the measurement, one percent strength (1 g/100 ml) solutions of the polymer in toluene were prepared and the kinematic viscosities thereof were determined with the aid of a VOGEL-OSSAG viscometer. After standardization to the viscosity of toluene, the relative viscosity is obtained, from which the K value can be calculated by the FIKENTSCHER method (Polymer 8/1967, 381 et seq.).

[0123] Flash-Off Time

[0124] The flash-off time is the time which elapses after application of the primer to the substrate until the solvent evaporates, that is to say the primer is “dry”. The measurement is carried out by applying the primer to a glass plate with a brush in a layer thickness of from 5 to 10 μm at 23° C. and then measuring the time until the solvent has evaporated. This point in time is determined optically. It can be recognized by the fact that the primer layer loses its gloss caused by the solvent.

[0125] Initial Strength

[0126] The initial strength is the strength which the primer has a short time after evaporation of the solvent. Strength is understood here as meaning the combined strength of both the internal strength of the primer (cohesion) and the adhesive strength (adhesion) to the substrate. The initial strength is determined by first applying the primer to glass analogously to the determination of the flash-off time. Immediately after evaporation of the solvent test adhesive tape 5 described below is stuck on to the primer layer produced in this way and briefly pressed on gently by hand. The adhesive tape is then peeled off again by hand after 15 seconds and in further analogous tests after 30 seconds, 60 seconds, 90 seconds and 120 seconds, 180 seconds and 240 seconds. The initial strength is reached at a sufficient level when on peeling off of the adhesive tape no primer residues are visible on the adhesive tape or the adhesive tape splits cohesively.

[0127] Repositionability

[0128] Repositionability exists if an adhesive tape stuck on to the dried primer layer can be removed again without destruction immediately after being stuck on, without the primer also being peeled off from the substrate or splitting cohesively.

[0129] Testing was carried out with the double-sided acrylate foam test adhesive tapes 1 to 4 described below, which each have an adhesive strength of greater than 20 N/cm on steel. The test is carried out by first applying the primer to glass analogously to the determination of the flash-off time. Immediately after evaporation of the solvent measurement of the time starts. After 15 seconds and in further analogous tests after 30 seconds, 45 seconds, 60 seconds, 90 seconds, 120 seconds, 180 seconds and 240 seconds the double-sided acrylate foam test adhesive tapes are stuck on to the primer layer produced in this way, briefly pressed on gently by hand and immediately peeled off again. Repositionability exists if on peeling off of the adhesive tape no primer residues are visible on the adhesive tape.

[0130] The following substrates (bases on which the primer was initially applied and on to which the adhesive tape was then stuck) were used: [0131] a) Glass test specimen (Rocholl GmbH) [0132] b) Ceramic tile (Baumarkt)

[0133] The test adhesive tapes which are not commercially obtainable (test adhesive tapes 1, 2 and 3) and with which the primer was tested were based on polyacrylate and polyacrylate/synthetic rubber pressure-sensitive adhesives. The following raw materials were used for the preparation of these pressure-sensitive adhesives:

TABLE-US-00002 Manufacturer Chemical compound Trade name or supplier CAS no. Bis(4-tert- Perkadox ®16 Akzo Nobel 15520-11-3 butylcyclohexyl)peroxydicarbonate 2,2′-Azobis(2-methylpropionitrile), Vazo ®64 DuPont 78-67-1 AIBN 2,2′-Azobis(2-methylbutyronitrile) Vazo ®67 DuPont 13472-08-7 Pentaerythritol tetraglycidyl ether Polypox ®R16 UPPC AG 3126-63-4 3,4-Epoxycyclohexylmethyl-3,4- Uvacure ®1500 Cytec 2386-87-0 epoxycyclohexanecarboxylate Industries Inc. Triethylenetetramine Epikure ®925 Hexion 112-24-3 Speciality Chemicals Microballoons (MB) Expancel ®051 DU 40 Expancel (dry-unexpanded microspheres, diameter 9 Nobel to 15 μm, expansion start temperature 106 Industries to 111° C., TMA density ≦25 kg/m.sup.3) Terpene phenolic resin (softening Dertophene ®T110 DRT resins 25359-84-6 point 110° C.; M.sub.w = 500 to 800 g/mol; D = 1.50) Terpene phenolic resin (softening Dertophene T105 DRT resins 25359-84-6 point 105° C.; M.sub.w = 500 to 800 g/mol) Acrylic acid n-butyl ester n-Butyl acrylate Rohm & Haas 141-32-2 Acrylic acid Acrylic acid pure BASF 79-10-7 2-Ethylhexyl acrylate Brenntag 103-11-7 Methyl acrylate BASF 96-33-3 Styrene/butadiene block copolymer Kraton D1118 Kraton 9003-55-8 (approx. 31% polystyrene content) Polymers Polyoxyethylene(15)coco-amine Ethomeen C/25 Akzo Nobel 61791-14-8 Reofos RDP Tetraphenylresorcinol Chemtura 57583-54-7 bis(diphenyl phosphate)

[0134] The expansion capacity of the microballoons can be described by the determination of the TMA density [kg/m.sup.3] (Stare Thermal Analysis System from Mettler Toledo; heating rate 20° C./min). The TMA density here is the minimum density which can be achieved at a certain temperature T.sub.max under normal pressure before the microballoons collapse.

[0135] The determination of the softening point of the resins is carried out in accordance with DIN ISO 4625.

[0136] The following solvents were furthermore used for the preparation of the polyacrylate pressure-sensitive adhesives contained in the test adhesive tapes which are not commercially obtainable:

TABLE-US-00003 Name CAS no. Manufacturer Special grade naphtha 60/95 64742-49-0 Shell, Exxon Acetone 67-64-1 Shell Isopropanol 67-63-0 Shell

[0137] Test Adhesive Tape 1

[0138] An example of polyacrylate pressure-sensitive adhesive 1 for producing test adhesive tape 1 was prepared as follows:

[0139] A conventional reactor for free radical polymerizations was filled 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 passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 40 g of Vazo 67, dissolved in 400 g of acetone, were added. The external heating bath was then heated to 75° C. and the reaction was carried out under constant conditions at this external temperature. After 1 h 40 g of Vazo 67, dissolved in 400 g of acetone, were again added, and after 4 h the mixture was diluted with 10 kg of acetone/isopropanol mixture (94:6).

[0140] After 5 h and after 7 h in each case the reaction was after-initiated with 120 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate, in each case dissolved in 400 g of acetone. After a reaction time of 22 h the polymerization was interrupted and the mixture 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 percent by weight). 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.

[0141] This base polymer was melted in a feeder extruder (single-screw conveying extruder from TROESTER GmbH & Co KG, Germany) and with this as the polymer melt was conveyed via a heatable hose into a planetary roller extruder from Entex (Bochum). The molten resin Dertophene T 110 was now added via a metering opening so that a concentration of the resin in the melt of 28.3 percent by weight resulted. The crosslinking agent Polypox R16 was furthermore added. Its concentration in the melt was 0.14 percent by weight. All the components were mixed to a homogeneous polymer melt.

[0142] The polymer melt was transferred into a twin screw extruder (Berstorff) by means of a melt pump and a heatable hose. The accelerator Epikure 925 was added there. Its concentration in the melt was 0.14 percent by weight. The entire polymer mixture was then freed from all gas inclusions in a vacuum dome under a pressure of 175 mbar. After the vacuum dome, the microballoons were metered in and incorporated homogeneously into the polymer mixture by means of a mixing element. Their concentration in the melt was 0.7 percent by weight. The melt mixture formed was transferred into a nozzle.

[0143] After leaving the nozzle, that is to say after a drop in pressure, the microballoons incorporated expanded, a shear-free cooling of the polymer mass taking place due to the drop in pressure. A foamed polyacrylate pressure-sensitive adhesive was formed, which was then shaped by means of a roll calender into the form of a web in a thickness of 0.8 mm and covered with a double-sided siliconized release film (50 μm polyester), during which the chemical crosslinking reaction progressed. The wound-up film was stored at room temperature for four weeks, before it was used further for the primer testing. The wound-up film is test adhesive tape 1.

[0144] Test Adhesive Tape 2

[0145] An example of polyacrylate pressure-sensitive adhesive 2A for producing the middle layer of the three-layered test adhesive tape 2 was prepared as follows:

[0146] A conventional reactor for free radical polymerizations was filled 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 passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 50 g of Vazo 67, dissolved in 500 g of acetone, were added. The external heating bath was then heated to 70° C. and the reaction was carried out under constant conditions at this external temperature. After 1 h 50 g of Vazo 67, dissolved in 500 g of acetone, were again added, and after 2 h the mixtures was diluted with 10 kg of acetone/isopropanol mixture (96:4). After 5.5 h 150 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate, dissolved in 500 g of acetone, were added; after 6 h 30 min the mixture was diluted again with 10 kg of acetone/isopropanol mixture (96:4). After 7 h a further 150 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate, dissolved in 500 g of acetone, were added and the heating bath was regulated at a temperature of 60° C.

[0147] After a reaction time of 22 h the polymerization was interrupted and the mixture was cooled to room temperature. The product had a solids content of 50.2% and was dried.

[0148] 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 Tg=−38.0° C.

[0149] This base polymer was melted in a feeder extruder (single-screw conveying extruder from TROESTER GmbH & Co KG, Germany) and with this as the polymer melt was conveyed via a heatable hose into a planetary roller extruder from Entex (Bochum). The crosslinking agent Polypox R16 was now added via a metering opening. Its concentration in the melt was 0.22 percent by weight. All the components were mixed to a homogeneous polymer melt.

[0150] The polymer melt was transferred into a twin screw extruder (Berstorff) by means of a melt pump and a heatable hose. The accelerator Epikure 925 was added there. Its concentration in the melt was 0.14 percent by weight. The entire polymer mixture was then freed from all gas inclusions in a vacuum dome under a pressure of 175 mbar. After the vacuum dome, the microballoons were metered in and incorporated homogeneously into the polymer mixture by means of a mixing element. Their concentration in the melt was 2.0 percent by weight. The melt mixture formed was transferred into a nozzle.

[0151] After leaving the nozzle, that is to say after a drop in pressure, the microballoons incorporated expanded, a shear-free cooling of the polymer mass taking place due to the drop in pressure. The foamed polyacrylate pressure-sensitive adhesive 2A was formed, which was then shaped by means of a roll calender into the form of a web in a thickness of 0.8 mm and covered with a double-sided siliconized release film (50 μm polyester), during which the chemical crosslinking reaction progressed. The wound-up film was stored for one day at room temperature before the further processing (see below).

[0152] An example of polyacrylate pressure-sensitive adhesive 2B for producing the two outer layers of the three-layered test adhesive tape 2 was prepared as follows:

[0153] A conventional 100 l glass reactor for free radical polymerizations was filled 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/special naphtha 60/95 (1:1). After passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 30 g of AIBN were added. The external heating bath was then heated to 75° C. and the reaction was carried out under constant conditions at this external temperature. After a reaction time of 1 h 30 g of AIBN were again added. After 4 and 8 h the mixture was diluted with in each case 10.0 kg of acetone/special naphtha 60/95 (1:1) mixture. For reduction of the residual initiators, after 8 h and 10 h in each case 90 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate were added. The reaction was interrupted after a reaction time of 24 h and the mixture was cooled to room temperature. The polyacrylate was then blended with 0.2 percent by weight of the crosslinking agent Uvacure® 1500, the mixture was diluted with acetone to a solids content of 30% and then coated from solution on to a double-sided siliconized release film (50 μm polyester). (Coating speed 2.5 m/min, drying tunnel 15 m, temperature zone 1: 40° C., zone 2: 70° C., zone 3: 95° C., zone 4: 105° C.). The thickness was 50 μm. The wound-up film was stored at room temperature for two days, before it was used further for producing test adhesive tape 2.

[0154] A film of the polyacrylate pressure-sensitive adhesive 2B was laminated on to both sides of the foamed film of the polyacrylate pressure-sensitive adhesive 2A. Immediately before laminating the film of the polyacrylate pressure-sensitive adhesive 2B on to the foamed film of the polyacrylate pressure-sensitive adhesive 2A, the particular surface to be laminated of the film of the polyacrylate pressure-sensitive adhesive 2A was subjected to air corona pretreatment at a corona dose of 35 Wmin/m.sup.2. Before the second lamination the double-sided siliconized release film of the foamed polyacrylate pressure-sensitive adhesive 2A was uncovered. After the second lamination one of the double-sided siliconized release films of the two foamed polyacrylate pressure-sensitive adhesives 2B was uncovered. The three-layered composite of polyacrylate pressure-sensitive adhesive 2B/polyacrylate pressure-sensitive adhesive 2A/polyacrylate pressure-sensitive adhesive 2B was wound up and stored at room temperature for four weeks, before it was used further for the primer testing. The wound-up composite is test adhesive tape 2.

[0155] The polyacrylate pressure-sensitive adhesives described by way of example in their composition and preparation method are described in detail in DE 10 2010 062 669. The disclosure content of this specification is explicitly tied in with the disclosure content of the present description.

[0156] Test Adhesive Tape 3 (Single-Layered Adhesive Tape Based on a Polyacrylate/Synthetic Rubber Mixture)

[0157] An example of polyacrylate/synthetic rubber pressure-sensitive adhesive 3 for producing test adhesive tape 3 was prepared as follows:

[0158] A conventional reactor for free radical polymerizations was filled 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 passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 50 g of AIBN, dissolved in 500 g of acetone, were added. The external heating bath was then heated to 75° C. and the reaction was carried out under constant conditions at this external temperature. After 1 h 50 g of AIBN, dissolved in 500 g of acetone, were again added, and after 4 h the mixture was diluted with 10 kg of acetone/isopropanol mixture (94:6).

[0159] After 5 h and after 7 h in each case the reaction was after-initiated with 150 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate, in each case dissolved in 500 g of acetone. After a reaction time of 22 h the polymerization was interrupted and the mixture 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 percent by weight). The resulting polyacrylate base polymer 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 Tg=−35.2° C.

[0160] The mixture with the synthetic rubber was prepared as follows:

[0161] The synthetic rubber Kraton D1118 as granules was melted in a planetary roller extruder via a solids metering unit. The addition of a microballoon paste (50% Expancel 051DU40 in Ethomeen C25) followed. The polyacrylate base polymer, which was premelted in a single-screw extruder, was fed in via a side feeder and a terpene phenolic resin (Dertophene DT105) was metered in. Crosslinking agent (Polypox R16 15% in Reofos RDP) and accelerator (15% Epicure 925 in Reofos RDP) solution was added to the mixture. The melt was mixed thoroughly and coated between two release films (siliconized PET film) via a two-roll calender. A single-layered adhesive tape having a layer thickness of 1,200 μm and a density of 550 kg/m.sup.3 resulted. This adhesive tape is test adhesive tape 3. The composition was 48% polyacrylate, 25% Kraton D1118, 18% Dertophene DT105, 4% crosslinking agent/accelerator solution (crosslinking agent:accelerator=1:1), 5% microballoon paste (data in wt. %). The adhesive strength on steel after an uptake time of 3 days was approx. 37 N/cm.

[0162] Test Adhesive Tape 4: 3M™ Acrylic Foam Tape 5314

[0163] Description: 760 μm thick, double-sided acrylate foam adhesive tape; adhesive strength on steel after an uptake time of 3 days: 70.1 N/cm (until the initial resistance at the start of peeling off is overcome), 24.4 N/cm (in the further course of peeling off); the uncovered side was used for the tests.

[0164] Test Adhesive Tape 5: Tesa® 4657

[0165] Description: 290 μm thick, single-sided adhesive tape with an acrylate-coated woven carrier and an adhesive composition based on natural rubber; adhesive strength on steel: approx. 4.6 N/cm.

[0166] The following raw materials were used for the preparation of the copolymer contained according to the invention in the primer:

TABLE-US-00004 Chemical compound Trade name Manufacturer CAS no. N-Vinylcaprolactam Sigma-Aldrich 2235-00-9 N-Vinyl-2-pyrrolidone Sigma-Aldrich 88-12-0 Acrylic acid n-butyl ester n-Butyl acrylate Rohm & Haas 141-32-2 2-Ethylhexyl acrylate Brenntag 103-11-7 Bis(4-tert- Perkadox ®16 Akzo Nobel 15520-11-3 butylcyclohexyl)peroxydicarbonate 2,2′-Azobis(2-methylpropionitrile), Vazo ®64 DuPont 78-67-1 AIBN

[0167] The following solvents were furthermore used for the preparation of the copolymer contained according to the invention in the primer:

TABLE-US-00005 Name CAS no. Manufacturer Special grade naphtha 60/95 64742-49-0 Shell, Exxon Acetone 67-64-1 Shell

[0168] The polyacrylate pressure-sensitive adhesives for use as a constituent in the primer according to the invention were prepared as follows:

[0169] Primer Pressure-Sensitive Adhesive 1

[0170] A conventional 100 l glass reactor for free radical polymerizations was filled with 12.0 kg of N-vinylcaprolactam, 28.0 kg of butyl acrylate and 26.7 kg of acetone/special naphtha 60/95 (1:1). After passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 30 g of AIBN were added. The external heating bath was then heated to 75° C. and the reaction was carried out under constant conditions at this external temperature. After a reaction time of 1 h 30 g of AIBN were again added. After 4 and 8 h the mixture was diluted with in each case 10.0 kg of acetone/special naphtha 60/95 (1:1) mixture. For reduction of the residual initiators, after 8 h and after 10 h in each case 90 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate were added. The reaction was interrupted after a reaction time of 24 h and the mixture was cooled to room temperature. The polyacrylate was diluted with acetone to a solids content of 40.0 percent by weight. The solution obtained in this way is primer pressure-sensitive adhesive 1.

[0171] Primer Pressure-Sensitive Adhesive 2

[0172] A conventional 100 l glass reactor for free radical polymerizations was filled with 8.0 kg of N-vinylcaprolactam, 32.0 kg of 2-ethylhexyl acrylate and 26.7 kg of acetone/special naphtha 60/95 (1:1). After passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 30 g of AIBN were added. The external heating bath was then heated to 75° C. and the reaction was carried out under constant conditions at this external temperature. After a reaction time of 1 h 30 g of AIBN were again added. After 4 and 8 h the mixture was diluted with in each case 10.0 kg of acetone/special naphtha 60/95 (1:1) mixture. For reduction of the residual initiators, after 8 h and after 10 h in each case 90 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate were added. The reaction was interrupted after a reaction time of 24 h and the mixture was cooled to room temperature. The polyacrylate was diluted with acetone to a solids content of 40.0 percent by weight. The solution obtained in this way is primer pressure-sensitive adhesive 2.

[0173] Primer Pressure-Sensitive Adhesive 3

[0174] A conventional 100 l glass reactor for free radical polymerizations was filled with 8.0 kg of N-vinyl-2-pyrrolidone, 32 kg of butyl acrylate and 26.7 kg of acetone/special naphtha 60/95 (1:1). After passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 30 g of AIBN were added. The external heating bath was then heated to 75° C. and the reaction was carried out under constant conditions at this external temperature. After a reaction time of 1 h 30 g of AIBN were again added. After 4 and 8 h the mixture was diluted with in each case 10.0 kg of acetone/special naphtha 60/95 (1:1) mixture. For reduction of the residual initiators, after 8 h and after 10 h in each case 90 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate were added. The reaction was interrupted after a reaction time of 24 h and the mixture was cooled to room temperature. The polyacrylate was diluted with acetone to a solids content of 40.0 percent by weight. The solution obtained in this way is primer pressure-sensitive adhesive 3.

[0175] Primer Pressure-Sensitive Adhesive 4 for a Comparative Example

[0176] A conventional 100 l glass reactor for free radical polymerizations was filled with 15.4 kg of butyl acrylate, 24.4 kg of 2-ethylhexyl acrylate and 26.7 kg of acetone/special naphtha 60/95 (1:1). After passing nitrogen gas through for 45 minutes, while stirring, the reactor was heated up to 58° C. and 30 g of AIBN were added. The external heating bath was then heated to 75° C. and the reaction was carried out under constant conditions at this external temperature. After a reaction time of 1 h 30 g of AIBN were again added. After 4 and 8 h the mixture was diluted with in each case 10.0 kg of acetone/special naphtha 60/95 (1:1) mixture. For reduction of the residual initiators, after 8 h and after 10 h in each case 90 g of bis(4-tert-butylcyclohexyl)peroxydicarbonate were added. The reaction was interrupted after a reaction time of 24 h and the mixture was cooled to room temperature. The polyacrylate was diluted with acetone to a solids content of 40.0 percent by weight. The solution obtained in this way is primer pressure-sensitive adhesive 4.

[0177] Primer pressure-sensitive adhesives 1 to 4 were briefly characterized by DMA measurements. The G′ and G″ curves of primer pressure-sensitive adhesives 1 to 4 in the deformation frequency range of from 10.sup.0 to 10.sup.1 rad/sec at 23° C. were always at least partly in the range of from 10.sup.3 to 10.sup.7 Pa.

[0178] The primer pressure-sensitive adhesives described above with respect to their preparation and composition and the following raw materials were used for the preparation of the primers according to the invention:

TABLE-US-00006 Chemical compound/description Manufacturer (manufacturer's information) Trade name or supplier CAS no. N-Dimethoxy(methyl)silylmethyl-O- Geniosil ®XL 65 Wacker- 23432-65-7 methyl carbamate Chemie N-Trimethoxysilylmethyl-O-methyl Geniosil ®XL 63 Wacker- 23432-64-6 carbamate Chemie Methacryloxymethyl- Geniosil ®XL 33 Wacker- 54586-78-6 trimethoxysilane Chemie N-Cyclohexylaminomethyl- Geniosil ®XL 926 Wacker- 26495-91-0 triethoxysilane Chemie Titanium tetraisopropanolate Tyzor ® TPT Lehmann & 546-68-9 Voβ Tetra-n-butyl titanate Tyzor ® TnBT Lehmann & 5593-70-4 Voβ Bis(acetylacetonato) isobutyl Tyzor ® AA-95 Lehmann & 97281-09-9 isopropyl titanate Voβ Tetra-n-butyl zirconate Tyzor ® NBZ Lehmann & 1071-76-7 Voβ Ethylenediamine Sigma- 107-15-3 Aldrich Isophoronediamine Sigma- 2855-13-2 Aldrich Tosyl isocyanate Additiv TI ® OMG 4083-64-1 Borchers

[0179] The primers according to the invention were modified with the following raw materials for the preparation of the comparative examples and the less advantageous examples:

TABLE-US-00007 Chemical compound/description Manufacturer (manufacturer's information) Trade name or supplier SBS block copolymer Kraton ® D 1102 E Kraton Polymers Hydrogenated SEBS block Kraton ® G 1652 E Kraton Polymers copolymer Vinyltrimethoxysilane Geniosil ® XL 10 Wacker Chemie (CAS-Nr.: 2768-02-7)

[0180] In addition to the solvents contained in the primer pressure-sensitive adhesives, the following solvents were furthermore used for the preparation of the primers according to the invention:

TABLE-US-00008 Manufacturer or Name CAS no. supplier Ethyl acetate 141-78-6 Brenntag Acetone 67-64-1 Shell Isopropanol 67-63-0 Sigma-Aldrich

[0181] In addition to the solvents contained in the primer pressure-sensitive adhesives, the following solvent was used for the preparation of the non-advantageous examples:

TABLE-US-00009 Manufacturer or Name CAS no. supplier Toluene 108-88-3 Sigma-Aldrich

[0182] The following pigments and functional fillers were incorporated by way of example into the primers:

TABLE-US-00010 Chemical compound/description (manufacturer's Manufacturer information) Trade name or supplier CAS no. Furnace black, oil Printex ® 60 Orion 1333-86-4 absorption number OAN: 118, BET surface area: 115 Furnace black, oil Printex ® 3 Orion 1333-86-4 absorption number OAN: 128, BET surface area: 80 Copper chromite black Black 30C965 ® Shepherd 68186-91-4 spinel C.I. Pigment Black 28

[0183] The following fluorescent optical brighteners were furthermore also used:

TABLE-US-00011 Chemical compound/description (manufacturer's Manufacturer information) Trade name or supplier CAS no. 2,5-Thiophenediylbis(5- Tinopal OB ® BASF 7128-64-5 tert-butyl-1,3-benzoxazole)

EXAMPLES

[0184] The raw materials/components stated in the examples were mixed with a laboratory stirrer from IKA® using a propeller stirrer at a moderate speed of rotation. The raw materials were added here in the sequence as shown in the following tables. After the last solvent had been added, the mixture was stirred for 20 minutes. The mixture was then stirred for 10 minutes after each addition of the next particular raw material. After the last raw material had been added, the mixture was stirred for 30 minutes.

[0185] The pigments and rheological additives for achieving a fine-grained, opaque primer layer were incorporated in all the examples with the Ultra-Turrax® T50 laboratory dissolver from IKA®, which operates according to the rotor-stator principle, in a manner such that the pigment and where appropriate the further rheological additives were dispersed into the mixture of primer pressure-sensitive adhesive and solvents initially prepared. The Ultra-Turrax®T50 was operated here with a speed of rotation of 7,000 revolutions per minute. Dispersing was carried out for 30 minutes.

[0186] The remaining raw materials/components were then admixed in—in the sequence as shown in the following tables. The admixing in of these remaining raw materials/components was carried out with the laboratory stirrer from IKA® using a propeller stirrer.

[0187] The compositions of the primers comprising pigments and where appropriate rheological additives were modified compared to the compositions which did not comprise these substances to the effect that the weight contents of the silane, of the metal compound and of the amine were increased, while retaining the weight ratios of these substances to one another. The weight ratios of the other substance likewise remained unchanged with respect to on another.

Example 1

[0188] Composition of the Primer:

TABLE-US-00012 No. Raw material/component Percent by weight 1 Primer pressure-sensitive adhesive 1 19.55 (40.0 percent by weight solids content) 2 Acetone 25.25 3 Isopropanol 14.52 4 Ethyl acetate 33.51 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.26

[0189] The flash-off time was 40 sec.

[0190] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00013 Test adhesive Test adhesive tape 1 Test adhesive tape 2 Test adhesive tape 3 Test adhesive tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 15 min 1 h 15 min 1 h 1 h 1 h 1 h 1 h until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 15 sec (A) achieve an adequate initial strength Time taken to 30 sec 60 sec 15 sec 30 sec 15 sec 15 sec 15 sec 30 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 1a

[0191] Composition of the primer with the coloured pigment Printex® 60:

TABLE-US-00014 No. Raw material/component Percent by weight 1 Primer pressure-sensitive adhesive 1 17.50 (40.0 percent by weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.00 5 Printex ® 60 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0192] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0193] The primer was tested in the same manner as the pigment-free primer from Example 1, the same results being obtained.

Example 1b

[0194] Composition of the primer with the coloured pigment Printex® 3:

TABLE-US-00015 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.00 5 Printex ® 3 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0195] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0196] The primer was tested in the same manner as the pigment-free primer from Example 1, the same results being obtained.

Example 1c

[0197] Composition of the primer with the coloured pigment Black 30C965®:

TABLE-US-00016 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 16.45 weight solids content) 2 Acetone 21.24 3 Isopropanol 12.22 4 Ethyl acetate 28.19 5 Black 30C965 ® 8.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0198] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0199] The primer was tested in the same manner as the pigment-free primer from Example 1, the same results being obtained.

Example 2

[0200] Composition of the Primer:

TABLE-US-00017 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.85 weight solids content) 2 Acetone 24.14 3 Isopropanol 14.75 4 Ethyl acetate 32.90 5 Tyzor ® TPT 6.09 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.26

[0201] The flash-off time was 30 sec.

[0202] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00018 Test adhesive Test adhesive tape 1 Test adhesive tape 2 Test adhesive tape 3 Test adhesive tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 12 h 12 h 12 h 12 h 24 h 24 h 12 h 12 h until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 30 sec (A) achieve an adequate initial strength Time taken to 60 sec 60 sec 30 sec 30 sec 15 sec 15 sec 30 sec 30 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 2a

[0203] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00019 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 21.28 3 Isopropanol 13.00 4 Ethyl acetate 29.00 5 Printex ® 60 3.00 6 Tyzor ® TPT 11.82 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0204] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0205] The primer was tested in the same manner as the pigment-free primer from Example 2, the same results being obtained.

Example 2b

[0206] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00020 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 21.28 3 Isopropanol 13.00 4 Ethyl acetate 29.00 5 Printex ® 3 3.00 6 Tyzor ® TPT 11.82 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0207] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0208] The primer was tested in the same manner as the pigment-free primer from Example 2, the same results being obtained.

Example 2c

[0209] Composition of the primer with the coloured pigment Black 30C965®:

TABLE-US-00021 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 16.42 weight solids content) 2 Acetone 19.96 3 Isopropanol 12.20 4 Ethyl acetate 27.21 5 Black 30C965 ® 8.00 6 Tyzor ® TPT 11.82 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0210] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0211] The primer was tested in the same manner as the pigment-free primer from Example 2, the same results being obtained.

Example 3

[0212] Composition of the Primer:

TABLE-US-00022 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.63 weight solids content) 2 Acetone 25.35 3 Isopropanol 14.58 4 Ethyl acetate 32.96 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 63 2.32 7 Ethylenediamine 0.26

[0213] The flash-off time was 40 sec.

[0214] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00023 Test adhesive Test adhesive tape 1 Test adhesive tape 2 Test adhesive tape 3 Test adhesive tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 1 h 1 h 30 min 1 h 1 h 1 h 1 h 1 h until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 60 sec (A) achieve an adequate initial strength Time taken to 30 sec 60 sec 15 sec 60 sec 15 sec 15 sec 30 sec 30 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 3a

[0215] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00024 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 29.40 5 Printex ® 60 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 63 4.50 8 Ethylenediamine 0.50

[0216] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0217] The primer was tested in the same manner as the pigment-free primer from Example 3, the same results being obtained.

Example 3b

[0218] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00025 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 29.40 5 Printex ® 3 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 63 4.50 8 Ethylenediamine 0.50

[0219] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0220] The primer was tested in the same manner as the pigment-free primer from Example 3, the same results being obtained.

Example 3c

[0221] Composition of the Primer with the Coloured Pigment Black 30C965®:

TABLE-US-00026 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 16.44 weight solids content) 2 Acetone 21.23 3 Isopropanol 12.21 4 Ethyl acetate 27.62 5 Black 30C965 ® 8.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 63 4.50 8 Ethylenediamine 0.50

[0222] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0223] The primer was tested in the same manner as the pigment-free primer from Example 3, the same results being obtained.

Example 4

[0224] Composition of the Primer:

TABLE-US-00027 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.63 weight solids content) 2 Acetone 25.35 3 Isopropanol 14.58 4 Ethyl acetate 32.96 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 33 2.32 7 Ethylenediamine 0.26

[0225] The flash-off time was 40 sec.

[0226] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00028 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 12 h  12 h   1 h 12 h  12 h  12 h.sup.  12 h  12 h  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 240 sec achieve an (A) adequate initial strength Time taken to 240 sec 180 sec 180 sec 120 sec 120 sec 90 sec 180 sec 120 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 4a

[0227] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00029 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 29.40 5 Printex ® 60 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 33 4.50 8 Ethylenediamine 0.50

[0228] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0229] The primer was tested in the same manner as the pigment-free primer from Example 4, the same results being obtained.

Example 4b

[0230] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00030 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 29.40 5 Printex ® 3 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 33 4.50 8 Ethylenediamine 0.50

[0231] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0232] The primer was tested in the same manner as the pigment-free primer from Example 4, the same results being obtained.

Example 5

[0233] Composition of the Primer:

TABLE-US-00031 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.52 weight solids content) 2 Acetone 25.21 3 Isopropanol 14.50 4 Ethyl acetate 33.70 5 Tyzor ® TPT 3.97 6 Geniosil ® XL 926 2.89 7 Ethylenediamine 0.21

[0234] The flash-off time was 40 sec.

[0235] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00032 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 12 h  12 h   1 h 12 h  12 h  12 h.sup.  12 h  12 h  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 120 sec achieve an (A) adequate initial strength Time taken to 240 sec 180 sec 180 sec 120 sec 120 sec 90 sec 180 sec 120 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 5a

[0236] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00033 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.20 5 Printex ® 60 3.00 6 Tyzor ® TPT 7.70 7 Geniosil ® XL 926 5.60 8 Ethylenediamine 0.40

[0237] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0238] The primer was tested in the same manner as the pigment-free primer from Example 5, the same results being obtained.

Example 5b

[0239] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00034 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.20 5 Printex ® 3 3.00 6 Tyzor ® TPT 7.70 7 Geniosil ® XL 926 5.60 8 Ethylenediamine 0.40

[0240] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0241] The primer was tested in the same manner as the pigment-free primer from Example 5, the same results being obtained.

Example 6

[0242] Composition of the Primer:

TABLE-US-00035 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.61 weight solids content) 2 Acetone 25.32 3 Isopropanol 14.56 4 Ethyl acetate 33.12 5 Tyzor ® TnBT 5.15 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.23

[0243] The flash-off time was 35 sec.

[0244] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00036 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 30 min 1 h  30 min 30 min 1 h  1 h  30 min 1 h  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 30 sec achieve an (A) adequate initial strength Time taken to 60 sec  60 sec 30 sec  30 sec  15 sec 15 sec 30 sec  30 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 6a

[0245] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00037 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 29.56 5 Printex ® 60 3.00 6 Tyzor ® TnBT 10.00 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.44

[0246] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0247] The primer was tested in the same manner as the pigment-free primer from Example 6, the same results being obtained.

Example 6b

[0248] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00038 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 29.56 5 Printex ® 3 3.00 6 Tyzor ® TnBT 10.00 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.44

[0249] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0250] The primer was tested in the same manner as the pigment-free primer from Example 6, the same results being obtained.

Example 7

[0251] Composition of the Primer:

TABLE-US-00039 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.73 weight solids content) 2 Acetone 25.48 3 Isopropanol 14.66 4 Ethyl acetate 32.24 5 Tyzor ® AA-95 5.67 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.21

[0252] The flash-off time was 35 sec.

[0253] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00040 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 12 h  1 h  1 h 12 h  12 h.sup.  12 h.sup.  12 h  1 h.sup.  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 120 sec achieve an (A) adequate initial strength Time taken to 120 sec 60 sec 120 sec 120 sec 30 sec 60 sec 120 sec 60 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 7a

[0254] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00041 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 28.60 5 Printex ® 60 3.00 6 Tyzor ® AA-95 11.00 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.40

[0255] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0256] The primer was tested in the same manner as the pigment-free primer from Example 7, the same results being obtained.

Example 7b

[0257] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00042 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 28.60 5 Printex ® 3 3.00 6 Tyzor ® AA-95 11.00 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.40

[0258] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0259] The primer was tested in the same manner as the pigment-free primer from Example 7, the same results being obtained.

Example 8

[0260] Composition of the Primer:

TABLE-US-00043 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.73 weight solids content) 2 Acetone 25.49 3 Isopropanol 14.66 4 Ethyl acetate 32.22 5 Tyzor ® NBZ 5.67 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.22

[0261] The flash-off time was 35 sec.

[0262] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00044 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 1 h  1 h  15 min 1 h  1 h  1 h  1 h  1 h  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 30 sec achieve an (A) adequate initial strength Time taken to 60 sec 60 sec 15 sec  30 sec 30 sec 15 sec 30 sec 30 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 8a

[0263] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00045 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 28.57 5 Printex ® 60 3.00 6 Tyzor ® NBZ 11.00 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.43

[0264] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0265] The primer was tested in the same manner as the pigment-free primer from Example 8, the same results being obtained.

Example 8b

[0266] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00046 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 28.57 5 Printex ® 3 3.00 6 Tyzor ® NBZ 11.00 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.43

[0267] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0268] The primer was tested in the same manner as the pigment-free primer from Example 8, the same results being obtained.

Example 9

[0269] Composition of the Primer:

TABLE-US-00047 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.35 weight solids content) 2 Acetone 24.98 3 Isopropanol 14.38 4 Ethyl acetate 34.94 5 Tyzor ® TPT 3.87 6 Geniosil ® XL 65 1.91 7 Isophoronediamine 0.57

[0270] The flash-off time was 40 sec.

[0271] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00048 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 12 h  24 h  12 h  12 h  24 h.sup.  12 h.sup.  12 h  12 h  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 120 sec achieve an (A) adequate initial strength Time taken to 120 sec 180 sec 120 sec 120 sec 60 sec 60 sec 120 sec 120 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 9a

[0272] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00049 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 31.60 5 Printex ® 60 3.00 6 Tyzor ® TPT 7.50 7 Geniosil ® XL 65 3.70 8 Isophoronediamine 1.10

[0273] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0274] The primer was tested in the same manner as the pigment-free primer from Example 9, the same results being obtained.

Example 9b

[0275] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00050 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 31.60 5 Printex ® 3 3.00 6 Tyzor ® TPT 7.50 7 Geniosil ® XL 65 3.70 8 Isophoronediamine 1.10

[0276] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0277] The primer was tested in the same manner as the pigment-free primer from Example 9, the same results being obtained.

Example 10

[0278] Composition of the Primer:

TABLE-US-00051 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 20.09 weight solids content) 2 Acetone 23.07 3 Isopropanol 14.92 4 Ethyl acetate 32.67 5 Tyzor ® TPT 4.38 6 Geniosil ® XL 65 2.06 7 Ethylenediamine 0.23 8 Additiv TI ® 2.58

[0279] The flash-off time was 40 sec.

[0280] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00052 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 1 h  1 h  15 min 1 h  1 h  1 h  1 h  1 h  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 60 sec achieve an (A + C) adequate initial strength Time taken to 90 sec 90 sec 60 sec  60 sec 30 sec 30 sec 60 sec 60 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 10a

[0281] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00053 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 20.10 3 Isopropanol 13.00 4 Ethyl acetate 28.46 5 Printex ® 60 3.00 6 Tyzor ® TPT 8.50 7 Geniosil ® XL 65 4.00 8 Ethylenediamine 0.44 9 Additiv TI ® 5.00

[0282] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0283] The primer was tested in the same manner as the pigment-free primer from Example 10, the same results being obtained.

Example 10b

[0284] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00054 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 Acetone 20.10 3 Isopropanol 13.00 4 Ethyl acetate 28.46 5 Printex ® 3 3.00 6 Tyzor ® TPT 8.50 7 Geniosil ® XL 65 4.00 8 Ethylenediamine 0.44 9 Additiv TI ® 5.00

[0285] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0286] The primer was tested in the same manner as the pigment-free primer from Example 10, the same results being obtained.

Example 11

[0287] Composition of the Primer:

TABLE-US-00055 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 2 (40.0 percent by 19.55 weight solids content) 2 Acetone 25.25 3 Isopropanol 14.52 4 Ethyl acetate 33.51 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.26

[0288] The flash-off time was 40 sec.

[0289] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00056 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time  1 h  1 h  1 h  1 h 1 h  1 h   1 h  1 h until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 60 sec achieve an (A) adequate initial strength Time taken to 120 sec 180 sec 120 sec 120 sec 60 sec 60 sec 120 sec 120 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 11a

[0290] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00057 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 2 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.00 5 Printex ® 60 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0291] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0292] The primer was tested in the same manner as the pigment-free primer from Example 11, the same results being obtained.

Example 11b

[0293] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00058 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 2 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.00 5 Printex ® 3 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0294] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0295] The primer was tested in the same manner as the pigment-free primer from Example 11, the same results being obtained.

Example 12

[0296] Composition of the Primer:

TABLE-US-00059 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 3 (40.0 percent by 19.55 weight solids content) 2 Acetone 25.25 3 Isopropanol 14.52 4 Ethyl acetate 33.51 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.26

[0297] The flash-off time was 40 sec.

[0298] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00060 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time  1 h 12 h   1 h 12 h  12 h.sup.  12 h.sup.   1 h  1 h until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 120 sec achieve an (A) adequate initial strength Time taken to 180 sec 180 sec 180 sec 180 sec 60 sec 60 sec 180 sec 180 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 12a

[0299] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00061 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 3 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.00 5 Printex ® 60 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0300] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0301] The primer was tested in the same manner as the pigment-free primer from Example 12, the same results being obtained.

Example 12b

[0302] Composition of the Primer with the Coloured Pigment Printex® 3:

TABLE-US-00062 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 3 (40.0 percent by 17.50 weight solids content) 2 Acetone 22.60 3 Isopropanol 13.00 4 Ethyl acetate 30.00 5 Printex ® 3 3.00 6 Tyzor ® TPT 9.50 7 Geniosil ® XL 65 3.90 8 Ethylenediamine 0.50

[0303] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0304] The primer was tested in the same manner as the pigment-free primer from Example 12, the same results being obtained.

Example 13

[0305] Composition of the Primer:

TABLE-US-00063 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.55 weight solids content) 2 Acetone 25.25 3 Isopropanol 14.52 4 Ethyl acetate 33.36 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.26 8 Tinopal OB ® 0.15

[0306] The flash-off time was 40 sec.

[0307] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00064 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 15 min 1 h  15 min 1 h  1 h  1 h  1 h  1 h  until the foam splits Fracture pattern C C C C C C C C after climate storage a) Fracture pattern C C C C C C C C after climate storage b) Time taken to 15 sec achieve an (A) adequate initial strength Time taken to 30 sec  60 sec 15 sec  30 sec 15 sec 15 sec 15 sec 30 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 14

[0308] Composition of the Primer:

TABLE-US-00065 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.74 weight solids content) 2 toluene 55.40 3 Ethyl acetate 16.92 4 Tyzor ® TPT 4.90 5 Geniosil ® XL 65 2.01 6 Ethylenediamine 0.26 7 Kraton ® D 1102 E 0.77

[0309] The flash-off time was 150 sec.

[0310] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00066 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 48 h.sup.  48 h  48 h.sup.  48 h  48 h.sup.  48 h.sup.  48 h.sup.  48 h.sup.  until the foam (A and C) (A and C) (A and C) (A and C) (A and C) (A and C) (A and C) (A and C) splits Fracture pattern A and C A and C A and C A and C A and C A and C A and C A and C after climate storage a) Fracture pattern A and C A and C A and C A and C A and C A and C A and C A and C after climate storage b) Time taken to 120 sec achieve an (A) adequate initial strength Time taken to 90 sec 120 sec 90 sec 120 sec 60 sec 60 sec 90 sec 90 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 14a

[0311] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00067 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 toluene 49.10 3 Ethyl acetate 15.00 4 Printex ® 60 3.00 5 Tyzor ® TPT 9.50 6 Geniosil ® XL 65 3.90 7 Ethylenediamine 0.50 8 Kraton ® D 1102 E 1.5

[0312] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0313] The primer was tested in the same manner as the pigment-free primer from Example 14, the same results being obtained.

Example 15

[0314] Composition of the Primer:

TABLE-US-00068 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.74 weight solids content) 2 toluene 55.40 3 Ethyl acetate 16.92 4 Tyzor ® TPT 4.90 5 Geniosil ® XL 65 2.01 6 Ethylenediamine 0.26 7 Kraton ® G 1652 E 0.77

[0315] The flash-off time was 160 sec.

[0316] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00069 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time 48 h  48 h  48 h  48 h  48 h.sup.  48 h.sup.  48 h.sup.  48 h.sup.  until the foam (A and C) (A and C) (A and C) (A and C) (A and C) (A and C) (A and C) (A and C) splits Fracture pattern A and C A and C A and C A and C A and C A and C A and C A and C after climate storage a) Fracture pattern A and C A and C A and C A and C A and C A and C A and C A and C after climate storage b) Time taken to 180 sec achieve an (A) adequate initial strength Time taken to 120 sec 120 sec 120 sec 120 sec 60 sec 60 sec 90 sec 90 sec achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Example 15a

[0317] Composition of the Primer with the Coloured Pigment Printex® 60:

TABLE-US-00070 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 17.50 weight solids content) 2 toluene 49.10 3 Ethyl acetate 15.00 4 Printex ® 60 3.00 5 Tyzor ® TPT 9.50 6 Geniosil ® XL 65 3.90 7 Ethylenediamine 0.50 8 Kraton ® G 1652 E 1.5

[0318] A 10 μm thick layer of this primer on glass was opaque. The transmission in the wavelength range of from 300 nm to 850 nm was 0%.

[0319] The primer was tested in the same manner as the pigment-free primer from Example 15, the same results being obtained.

Comparative Example 1

[0320] Composition of the Comparison Primer:

TABLE-US-00071 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 4 (40.0 percent by 19.55 weight solids content) 2 Acetone 25.25 3 Isopropanol 14.52 4 Ethyl acetate 33.51 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 65 2.01 7 Ethylenediamine 0.26

[0321] The flash-off time was 40 sec.

[0322] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00072 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   until the foam splits Time taken to >240 min achieve an adequate initial strength Time taken to >240 min >240 min >240 min >240 min >240 min >240 min >240 min >240 min achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Comparative Example 2

[0323] Composition of the Comparison Primer:

TABLE-US-00073 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 1 (40.0 percent by 19.55 weight solids content) 2 Acetone 25.25 3 Isopropanol 14.52 4 Ethyl acetate 33.77 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 65 2.01

[0324] The flash-off time was 40 sec.

[0325] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00074 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   until the foam splits Time taken to >240 min achieve an adequate initial strength Time taken to >240 min >240 min >240 min >240 min >240 min >240 min >240 min >240 min achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds

Comparative Example 3

[0326] Composition of the Comparison Primer:

TABLE-US-00075 Percent No. Raw material/component by weight 1 Primer pressure-sensitive adhesive 4 (40.0 percent by 19.55 weight solids content) 2 Acetone 25.25 3 Isopropanol 14.52 4 Ethyl acetate 33.51 5 Tyzor ® TPT 4.90 6 Geniosil ® XL 10 2.01 7 Ethylenediamine 0.26

[0327] The flash-off time was 40 sec.

[0328] The primer was tested with the test adhesive tapes, the following results being obtained:

TABLE-US-00076 Test adhesive Test adhesive Test adhesive Test adhesive Test adhesive tape 1 tape 2 tape 3 tape 4 tape 5 Glass Ceramic Glass Ceramic Glass Ceramic Glass Ceramic Glass Bonding time >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   >48 h   until the foam splits Time taken to >240 min achieve an adequate initial strength Time taken to >240 min >240 min >240 min >240 min >240 min >240 min >240 min >240 min achieve repositionability C = cohesive = splitting of the foam in the adhesive tape A = adhesive h = hours min = minutes sec = seconds