Adhesive tape, in particular, double-sided adhesive tape, and use thereof for attaching to non-polar surfaces

Abstract

An adhesive tape (1), in particular a double-sided adhesive tape has a substrate made of plastic with a self-adhesive, pressure-sensitive layer (3) consisting of a pressure-sensitive adhesive containing a UV-crosslinkable acrylate as primary constituent. In order to achieve an at least moderate, preferably increased adhesive force on nonpolar surfaces (4a) as well as preferably an increased shear strength, while preserving the advantages of the use of UV-crosslinkable acrylates in the adhesive coating and ensuring an at least moderate, preferably increased adhesive force on steel, the pressure-sensitive adhesive contains powdered silicon dioxide, wherein the substrate (2) made of plastic is configured as a film. The pressure-sensitive adhesive is modified with tackifying resins, such as pinene, indene and/or colophonium resins, their disproportioned, hydrated, polymerized, esterified derivates and/or salts and/or terpene and/or terpene phenol resins and/or aliphatic, aromatic, alkyl aromatic hydrocarbon resins, and/or with one or several C5- to C9-hydrocarbon resin(s).

Claims

1. An adhesive tape for use on nonpolar surfaces and steel, comprising: a substrate made of plastic and formed as a film, and a self-adhesive, pressure-sensitive adhesive layer on at least one side of the substrate, the adhesive layer consisting of a pressure-sensitive adhesive containing a crosslinked acrylate formed from non-aqueous and solvent-free UV-crosslinkable acrylate containing a photoinitiator incorporated therein by polymerization, the pressure sensitive adhesive further containing powdered nanoscale silicon dioxide, which with reference to the UV-crosslinkable acrylate, is within the range of 1 phr to 20 phr, the powered nanoscale silicon dioxide being dispersed in the non-aqueous and solvent free UV-crosslinkable acrylate, wherein the self-adhesive pressure-sensitive adhesive layer is applied with a specific surface weight of 20 g/m.sup.2 to 100 g/m.sup.2, wherein the pressure-sensitive adhesive is modified by at least one resin selected from the group consisting of: a disproportioned, hydrated, polymerized, esterified derivate of pinene, indene, and colophonium resins, a salt of pinene, indene, or colophonium resins, a terpene resin, a terpene phenol resin, an aliphatic hydrocarbon resin, a C5- to C9-hydrocarbon resin, an aromatic hydrocarbon resin, and an alkyl aromatic hydrocarbon resin; wherein the adhesive layer has a resin content with reference to the UV-crosslinkable acrylate within a range of 2 phr to 10 phr, and wherein the adhesive layer is respectively crosslinked with a UV-C-dosage within the range of 5 mJ/cm.sup.2 to 135 mJ/cm.sup.2, wherein the pressure-sensitive adhesive layer has an adhesive force on nonpolar surfaces, measured according to DIN EN 1939, of at least 2.0 N/cm, an adhesive force on steel measured according to DIN EN 1939 within the range of 6.0 to 18.0 N/cm, and a shear strength exceeding 1000 minutes at room temperature and at 70 C., after a dwell time of 15 minutes according to DIN EN 1943, wherein the UV-crosslinkable acrylate is a prepolymer, wherein the UV-crosslinkable acrylate, when determined at 130 C., has a content of non-volatile components of more than 99% by weight over a test period of 30 minutes, wherein the UV-crosslinkable acrylate has a K value, determined in accordance with DIN ISO 1628-1 in one percent tetrahydrofuran solution, in the range from 48 to 52.

2. The adhesive tape according to claim 1, wherein the particles of the powdered nanoscale silicone dioxide have an average size within the range of 5 nm to 250 nm.

3. The adhesive tape according to claim 1, wherein the powdered nanoscale silicone dioxide has a BET surface area within the range of 50 m.sup.2/g to 500 m.sup.2/g.

4. The adhesive tape according to claim 1, wherein the powdered nanoscale silicone dioxide is pyrogenically produced from a chlorosilane or by atomizing quartz sand in an electric arc.

5. The adhesive tape according to claim 1, wherein the powdered nanoscale silicon dioxide is hydrophobized by means of a surface treatment with organosilanes.

6. The adhesive tape according to claim 1, wherein the substrate is made from polyvinylchloride or polyester.

7. The adhesive tape according to claim 1, wherein the substrate has a thickness within the range of 0.005 mm to 0.5 mm.

8. The adhesive tape according to claim 1, wherein the substrate is provided on both sides with the self-adhesive pressure-sensitive adhesive layer.

9. The adhesive tape according to claim 1, wherein at least one of the self-adhesive pressure-sensitive adhesive layer is covered with a siliconized interliner formed by one of a siliconized paper, a siliconized film, and a siliconized polyethylene-coated paper.

10. The adhesive tape according to claim 1, wherein pressure sensitive adhesive is modified with the at least one C5- to C9-hydrocarbon resin.

11. The adhesive tape according to claim 1, wherein the adhesive tape is a double-sided adhesive tape.

12. The adhesive tape according to claim 1, wherein the adhesive force on nonpolar surfaces is the adhesive force on a polyolefin surface.

13. The adhesive tape according to claim 1, wherein the pressure-sensitive adhesive is modified by the at least one C5-to C9-hydrocarbon resin, which is selected from the group consisting of aliphatic C5 resin, hydrated colophonium ester resin, and C8/C9 aromatic hydrocarbon resin.

14. The adhesive tape according to claim 13, wherein a shear strength is exceeding 10000 minutes at room temperature and at 70 C., after a dwell time of 15 minutes according to DIN EN 1943.

15. An adhesive tape for use on nonpolar surfaces and steel, comprising: a substrate made of plastic and formed as a film, and a self-adhesive, pressure-sensitive adhesive layer on at least one side of the substrate, the adhesive layer consisting of a pressure-sensitive adhesive containing a crosslinked acrylate formed from non-aqueous and solvent-free UV-crosslinkable acrylate containing a photoinitiator incorporated therein by polymerization, the pressure sensitive adhesive further containing powdered nanoscale silicon dioxide, which with reference to the UV-crosslinkable acrylate, is within the range of 1 phr to 20 phr, the powered nanoscale silicon dioxide being dispersed in the non-aqueous and solvent free UV-crosslinkable acrylate, wherein the self-adhesive pressure-sensitive adhesive layer is applied with a specific surface weight of 20 g/m.sup.2 to 100 g/m.sup.2, wherein the adhesive layer is respectively crosslinked with a UV-C-dosage within the range of 5 mJ/cm.sup.2 to 135 mJ/cm.sup.2, wherein the pressure-sensitive adhesive layer has an adhesive force on nonpolar surfaces, measured according to DIN EN 1939, of at least 2.0 N/cm, an adhesive force on steel measured according to DIN EN 1939 within the range of 6.0 to 18.0 N/cm, and a shear strength exceeding 10,000 minutes at room temperature and at 70 C., after a dwell time of 15 minutes according to DIN EN 1943, wherein the UV-crosslinkable acrylate is a prepolymer, wherein the UV-crosslinkable acrylate, when determined at 130 C., has a content of non-volatile components of more than 99% by weight over a test period of 30 minutes, wherein the UV-crosslinkable acrylate has a K value, determined in accordance with DIN ISO 1628-1 in one percent tetrahydrofuran solution, in the range from 48 to 52.

16. The adhesive tape according to claim 1, wherein the powdered nanoscale silicon dioxide is hydrophilic.

17. An adhesive tape for use on nonpolar surfaces and steel, comprising: a substrate made of plastic and formed as a film, and a self-adhesive, pressure-sensitive adhesive layer on at least one side of the substrate, the adhesive layer consisting of a pressure-sensitive adhesive containing a crosslinked acrylate formed from non-aqueous and solvent-free UV-crosslinkable acrylate with a photoinitiator incorporated therein by polymerization, the pressure sensitive adhesive further containing powdered nanoscale silicon dioxide, which with reference to the UV-crosslinkable acrylate, is within the range of 1 phr to 20 phr, the powered nanoscale silicon dioxide being dispersed in the non-aqueous and solvent free UV-crosslinkable acrylate, wherein the self-adhesive pressure-sensitive adhesive layer is applied with a specific surface weight of 20 g/m.sup.2 to 100 g/m.sup.2, wherein the pressure-sensitive adhesive is modified by at least one resin selected from the group consisting of: a disproportioned, hydrated, polymerized, esterified derivate of pinene, indene, and colophonium resins, a salt of pinene, indene, or colophonium resins, a terpene resin, a terpene phenol resin, an aliphatic hydrocarbon resin, a C5- to C9-hydrocarbon resin, an aromatic hydrocarbon resin, and an alkyl aromatic hydrocarbon resin; wherein the adhesive layer has a resin content with reference to the UV-crosslinkable acrylate within a range of 2 phr to 10 phr, and wherein the adhesive layer is respectively crosslinked with a UV-C-dosage within the range of 5 mJ/cm.sup.2 to 135 mJ/cm.sup.2, wherein the pressure-sensitive adhesive layer has an adhesive force on nonpolar surfaces, measured according to DIN EN 1939, of at least 2.0 N/cm, an adhesive force on steel measured according to DIN EN 1939 within the range of 6.0 to 18.0 N/cm, and a shear strength exceeding 1000 minutes at room temperature and at 70 C., after a dwell time of 15 minutes according to DIN EN 1943, wherein the powdered nanoscale silicon dioxide is hydrophilic, wherein the UV-crosslinkable acrylate, when determined at 130 C., has a content of non-volatile components of more than 99% by weight over a test period of 30 minutes, wherein the UV-crosslinkable acrylate has a K value, determined in accordance with DIN ISO 1628-1 in one percent tetrahydrofuran solution, in the range from 48 to 52.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the sole FIGURE:

(2) FIG. 1 shows a schematic perspective cross section through an adhesive tape according to the invention, which is bonded to a component, whereby a preassembled assembly unit is formed.

DETAILED DESCRIPTION OF THE DRAWINGS

(3) As can be seen in FIG. 1, an adhesive tape 1 according to the invention, which is configured as a double-sided adhesive tape 1 in a preferred embodiment, comprises an especially tape-shaped substrate 2 made of plastic, which is provided at least on one sideon both sides in the depicted embodimentwith a pressure-sensitive adhesive film 3. Each adhesive film 3 consists of a pressure-sensitive adhesive containing a UV-crosslinking acrylate as its main component.

(4) The substrate 2 can preferably be consist of a polyvinylchloride or polyester film and has a thickness D within the range of 0.005 mm to 0.5 mm, preferably within the range of 0.1 mm to 0.3 mm.

(5) The adhesive tape 1 according to the invention can be bonded via the adhesive films 3to one component 4, as illustratedor preferably also to several components 4. Thus a preassembled assembly unit M is produced.

(6) In the upper portion of the depicted representation is shown as an example that the/each adhesive film 3 can be covered with a so-called interliner 5 made especially of silicone or silicone-coated paper, which makes possible for the adhesive tape 1 to be wound up onto itself without sticking during manufacture. These interliners can have either a film basis or paper basis and are provided on both sides with a silicone film based on a so-called Easy-Release and/or a CR-coating (controlled release). A corresponding selection of the Interliner with the desired silicone combination can be made here in dependence upon the coating method and/or application method.

(7) The adhesive tape 1 according to the invention can be advantageously used for continuous or intermittent bonding of parts or for providing self-adhesive features to profiles, channels, mirrors, displays, signs, scales, housings as well as for ornamental, decorative veneers, and lining and retaining parts, having especially nonpolar surfaces 4a, such as, for example, polyethylene (PE) or polypropylene (PP) surfaces 4a. The possible use of an adhesive tape 1 according to the invention is not limited to these materials, but the adhesive tape 1 can be used as an assembly adhesive tapefor example, in the furniture industryalso for bonding wooden parts orfor example, in the automobile manufacturefor bonding metal parts or films. A first component 4 of a first material can thus be advantageously bonded to the one side, and a second component 4 made of a second material different from the first material can be bonded to the other side.

(8) The substrate 2 is provided with a coating of pressure-sensitive adhesives having different compositions in the adhesive layer 3 in order to produce the adhesive tape 1 according to the invention. A direct coating onto the substrate material or a transfer coating, in which the adhesive is first applied onto a siliconized paper and subsequently transferred onto the substrate 2, can be used as coating type.

(9) Adhesive tapes 1 produced with the formulations A and B were mentioned in Table 1 as comparative examples for the adhesive film 3. The adhesive application amounted consistently to 60 g/m2. Two different valuesonce at 45 mJ/cm2 and once at 60 mJ/cm2were used, however, for the UV-C-dosage provided for the crosslinking.

(10) TABLE-US-00001 TABLE 1 Formulations for the Comparative Examples Formulation Component Unit Formulation A Formulation B AcResin 250 phr 100 0 AcResin 260 phr 0 100

(11) The two UV-crosslinkable acrylates AcResin 250 and AcResin 260 contained in Table 1 and also in the following tables are products of the BASF Company with photo initiators incorporated by polymerization, as described above. The specifications 250 and 260 relate to the preferred optimum wavelength in nanometers at which a maximum crosslinking of the mentioned prepolymers is obtained. Both products have a content of non-volatile components of more than 99 percent by weight when determined at 130 C. over a test period of 30 minutes. The so-called K valuedetermined according to DIN ISO 1628-1 in one-percent tetrahydrofurane solutionis within the range of 48 to 52, the density is 1.06 g/cm3, the glass transition temperature determined according to the DSC method is at 38 C. The viscosity at 130 C. measured according to EN ISO 3219, Appendix B, on the cone-plate viscometer at a shear speed of 100 RPM is within the range of 30 Pas to 70 Pas.

(12) The adhesive tapes 1 equipped with the adhesive films 3 produced in this manner achieved only the adhesive forces and shear strengths presented in Tables 2a and 2b. It can be deduced from this that the adhesives that were not UV-crosslinked according to the invention were not able to raise the shear strength at 70 C. to more than a value of 800 minutes by means of an increase in the UV dosage, since the cohesion of the UV-crosslinkable AcResin-adhesive cannot be further increased by means of increased UV-C-doses.

(13) TABLE-US-00002 TABLE 2a Adhesive Forces and Shear Strengths of the Comparative Examples (Low UV-C-Dose) Test Dwell Formulation Formulation Test Method Time Unit A B Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 45 45 Adhesive force DIN EN 10 min N/cm 10 8 on steel 1939 24 h 12 8 Adhesive force DIN EN 10 min N/cm 1.5 1.0 on PE 1939 24 h 2.5 1.0 Adhesive force DIN EN 10 min N/cm 3.5 1.5 on PP 1939 24 h 3.5 1.5 Shear strength DIN EN 15 min Min >10,000 >10,000 RT 1943 Shear strength DIN EN 15 min Min 250 500 at 70 C. 1943

(14) TABLE-US-00003 TABLE 2b Adhesive Forces and Shear Strengths of the Comparative Examples (High UV-C-Dose) Test Dwell Formulation Formulation Test Method Time Unit A B Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 65 65 Adhesive force DIN EN 10 min N/cm 10 7 on steel 1939 24 h 12 8 Adhesive force DIN EN 10 min N/cm 1.5 1.0 on PE 1939 24 h 2.5 1.0 Adhesive force DIN EN 10 min N/cm 1.5 1.5 on PP 1939 24 h 2.5 1.5 Shear strength DIN EN 15 min Min >10,000 >10,000 RT 1943 Shear strength DIN EN 15 min Min 250 800 at 70 C. 1943

(15) Adhesive tapes 1 with the formulations 1 and 2 mentioned in Table 3 for the adhesive films 3 were produced according to the invention. The adhesive application amounted again to consistently 60 g/m.sup.2. A value of 60 mJ/m.sup.2 was used as UV-C-dosage for crosslinking.

(16) TABLE-US-00004 TABLE 3 UV-Acrylate Formulations with Pyrogenic Silicic Acid (Without Resin) Formulation Component Unit Formulation 1 Formulation 2 AcResin 250 phr 100 0 AcResin 260 phr 0 100 Aerosil R 972 Phr 5 5

(17) The Aerosil R 972 contained in Table 3 is a commercially available pyrogenic silicic acid of Evonik Industries hydrophobized with DDS (dimethyldichlorosilane) and having a BET surface area of 11020 m2/g and a pH-value in water of 4.00.4, as well as a carbon content of 0.90.3 percent by weight.

(18) The adhesive forces and shear strengths presented in Table 4 were achieved for the adhesive tapes 1 equipped with the adhesive films 3 produced in this manner.

(19) The high shear strength at 70 C. of over 10,000 minutes of Table 4 in a comparison to the values of the comparative examples in Table 2b should be especially emphasized.

(20) Adhesive tapes 1 with the formulations 3 and 4a to 4c listed in Table 5 for the adhesive films 3 were then produced. An inventive importance is likewise ascribed to these adhesive tapes 1, which contain no pyrogenic silicic acid, as discussed above. The application of adhesive was again a consistent 60 g/m2. A value of 60 mJ/m2 was used as UV-C-dosage for crosslinking.

(21) TABLE-US-00005 TABLE 4 Adhesive Forces and Shear Strengths of Adhesive Tapes 1 with Adhesive Films 3 Using Formulations 1 and 2 (High UV-C-Dose) Test Dwell Formulation Formulation Test Method Time Unit 1 2 Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 65 65 Adhesive force DIN EN 10 min N/cm 10 8.5 on steel 1939 24 h 12 9.0 Adhesive force DIN EN 10 min N/cm 2.0 0.5 on PE 1939 24 h 2.5 0.5 Adhesive force DIN EN 10 min N/cm 0.5 0.5 on PP 1939 24 h 0.5 0.5 Shear strength DIN EN 15 min Min >10,000 >10,000 RT 1943 Shear strength DIN EN 15 min Min >10,000 >10,000 at 70 C. 1943

(22) TABLE-US-00006 TABLE 5 UV-Acrylate Formulations with Resin (Without Pyrogenic Silicic Acid) Formulation Formulation Formulation Formulation Component Unit Formulation 3 4a 4b 4c AcResin 250 phr 100 0 0 0 AcResin 260 phr 0 100 100 100 Aerosil R 972 phr 0 0 0 0 Escorez 1304 phr 5 5 0 0 Foral 105 phr 0 0 5 0 Kristalex F 100 phr 0 0 0 5

(23) The origin and chemical nature of the resins Escorez 1304, Foral 105 and Kristalex F 100 listed in Table 5 were already defined above.

(24) The adhesive tapes 1 equipped with the adhesive films 3 produced in this manner according to the invention achieved the adhesive forces and shear strengths presented in Tables 6a and 6b. The adhesive force of Tables 6a and 6b, which was increased to 2.5 N/cm and more on the nonpolar polyolefin surfaces polyethylene (PE) and polypropylene (PP) with respect to the values from the comparative examples of Table 2b, should be especially emphasized. A noticeable loss of shear strength is observed for the resin modification measured according to DIN EN 1943 with reference to the comparison between formulation 1 and formulation 3 at 70 C. A similar shear resistance loss is also observed between the formulation 2 as basic formulation and the formulation 4a at 70 C. measured according to DIN EN 1943, since resins have likewise been added in formulation 4a.

(25) TABLE-US-00007 TABLE 6a Adhesive Forces and Shear Strengths of Adhesive Tapes 1 with Adhesive Films 3 Using Formulations 3 and 4a (High UV-C-Dose) Test Dwell Formulation Formulation Test Method Dime Unit 3 4a Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 65 65 Adhesive force DIN EN 10 min N/cm 11 10.0 on steel 1939 24 h 12 10.5 Adhesive force DIN EN 10 min N/cm 2.5 2.5 on PE 1939 24 h 3.0 3.0 Adhesive force DIN EN 10 min N/cm 3.5 3.0 on PP 1939 24 h 4.0 3.0 Shear strength DIN EN 15 min Min >10,000 >10,000 RT 1943 Shear strength DIN EN 15 min Min 150 350 at 70 C. 1943

(26) TABLE-US-00008 TABLE 6b Adhesive Forces and Shear Strengths of Adhesive Tapes 1 with Adhesive Films 3 Using Formulations 4b and 4c (High UV-C-Dose) Test Dwell Formulation Formulation Test Method Time Unit 3 4a Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 65 65 Adhesive force DIN EN 10 min N/cm 10 10 on steel 1939 24 h 12 12 Adhesive force DIN EN 10 min N/cm 4.0 1.0 on PE 1939 24 h 4.5 1.0 Adhesive force DIN EN 10 min N/cm 2.5 0.5 on PP 1939 24 h 2.5 0.5 Shear strength DIN EN 15 min Min >10,000 5,000 RT 1943 Shear strength DIN EN 15 min Min 200 50 at 70 C. 1943

(27) The comparison of the shear strength at 70 C. between formulation 2 and formulations 4b and 4c measured according to DIN EN 1943 again shows a clear shear strength loss as soon as resins are added to the acResin adhesives.

(28) Still further adhesive tapes 1 were finally produced according to the invention with the formulations 5 to 10 for the adhesive films 3 mentioned in Tables 7a and 7b. The application of the adhesive amounted herein also consistently to 60 g/m.sup.2. A value of 60 mJ/m.sup.2 was used as UV-C-dosage for crosslinking.

(29) TABLE-US-00009 TABLE 7a UV-Acrylate with Pyrogenic Silicic Acid and Resin (Formulations 5 to 7) Formulation Formulation Component Unit 5 Formulation 6 Formulation 7 AcResin 250 phr 100 100 100 Aerosil R 972 phr 5 5 5 Escorez 1304 phr 5 0 5 Foral 105 phr 0 5 0 Kristalex F 100 phr 0 0 5

(30) TABLE-US-00010 TABLE 7b UV-Acrylate with Pyrogenic Silicic Acid and Resin (Formulations 8 to 10) Formulation Formulation Component Unit 8 Formulation 9 Formulation 10 AcResin 260 phr 100 100 100 Aerosil R 972 phr 5 5 5 Escorez 1304 phr 5 0 0 Foral 105 phr 0 5 0 Kristalex F 100 phr 0 0 5

(31) The adhesive tapes 1 equipped with the adhesive films 3 produced in this way according to the invention achieved the adhesive forces and shear strengths presented in Tables 8a to 8c. The adhesive force on the nonpolar polyolefin surfaces polyethylene (PE) and polypropylene (PP) of the mentioned tables, as well as the exceptionally high shear strength at 70 C. with respect to the values from the comparative examples in Table 2b, should be emphasized herein.

(32) TABLE-US-00011 TABLE 8a Adhesive Forces and Shear Strengths of Adhesive Tapes 1 with Adhesive Films 3 Using Formulations 5 and 6 (High UV-C-Dose) Test Dwell Formulation Formulation Test Method Time Unit 5 6 Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 65 65 Adhesive force DIN EN 10 min N/cm 12 16 on steel 1939 24 h 12 17 Adhesive force DIN EN 10 min N/cm 2.0 4.0 on PE 1939 24 h 2.0 4.5 Adhesive force DIN EN 10 min N/cm 1.0 2.0 on PP 1939 24 h 2.0 2.0 Shear strength DIN EN 15 min Min 2,500 >10,000 RT 1943 Shear strength DIN EN 15 min Min 250 200 at 70 C. 1943

(33) TABLE-US-00012 TABLE 8b Adhesive Forces and Shear Strengths of Adhesive Tapes 1 with Adhesive Films 3 Using Formulations 7 and 8 (High UV-C-Dose) Test Dwell Formulation Formulation Test Method Time Unit 7 8 Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 65 65 Adhesive force DIN EN 10 min N/cm 11.5 12 on steel 1939 24 h 13.5 12 Adhesive force DIN EN 10 min N/cm 1.5 2.5 on PE 1939 24 h 2.0 3.5 Adhesive force DIN EN 10 min N/cm 0.5 2.0 on PP 1939 24 h 0.5 3.0 Shear strength DIN EN 15 min Min >10,000 >10,000 RT 1943 Shear strength DIN EN 15 min Min >10,000 >10,000 at 70 C. 1943

(34) The invention is not restricted to the illustrated exemplary embodiments, but rather encompasses all of the embodiments having an equivalent effect within the scope of the invention as specified in Claims 1 and 10. The invention is furthermore not restricted to the features combinations defined in Claims 1 and 10 as well as the use according to the invention according to Claim 18, but can rather also be defined by means of any other desired combination of specific features of all the disclosed individual features.

(35) TABLE-US-00013 TABLE 8c Adhesive Forces and Shear Strengths of Adhesive Tapes 1 with Adhesive Films 3 Using Formulations 9 and 10 (High UV-C-Dose) Test Dwell Formulation Formulation Test Method Time Unit 9 10 Adhesive g/m.sup.2 60 60 application UV-C-dosage mJ/cm.sup.2 65 65 Adhesive force DIN EN 10 min N/cm 13.5 10.0 on steel 1939 24 h 15.0 12.0 Adhesive force DIN EN 10 min N/cm 4.0 1.0 on PE 1939 24 h 4.5 1.0 Adhesive force DIN EN 10 min N/cm 2.5 0.5 on PP 1939 24 h 2.5 0.5 Shear strength DIN EN 15 min Min >10,000 >10,000 RT 1943 Shear strength DIN EN 15 min Min 1000 500 at 70 C. 1943

(36) As a person skilled in the art will readily appreciate, the above description is meant as an illustration of the principles of this invention. This description is not intended to limit the scope or application of this invention in that the invention is susceptible to modification, variation and change, without departing from spirit of this invention, as defined in the following claims.