Adhesive tape, in particular, double-sided adhesive tape, and use thereof for attaching to non-polar surfaces
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 ( 4 a ) 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).
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 2 to 100 g/m 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 2 to 135 mJ/cm 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 2 /g to 500 m 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 2 to 100 g/m 2 ,
wherein the adhesive layer is respectively crosslinked with a UV-C-dosage within the range of 5 mJ/cm 2 to 135 mJ/cm 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 2 to 100 g/m 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 2 to 135 mJ/cm 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.