Pressure-sensitive adhesive strip
First Claim
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1. A pressure-sensitive adhesive strip comprising three layers as follows:
- an inner layer F composed of a non-extensible film carrier,a layer SK1 composed of a self-adhesive composition arranged on a surface of layer F and based on a vinylaromatic block copolymer composition foamed with microballoons,a layer SK2 composed of a self-adhesive composition arranged on an opposite surface of layer F from layer SK1 and based on a vinylaromatic block copolymer composition foamed with microballoons,where a mean diameter of each of voids formed by the microballoons in layers SK1 and SK2 is independently 20 to 60 μ
m.
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Abstract
The invention relates to a pressure-sensitive adhesive strip composed of at least three layers, comprising
- an inner layer F composed of a non-extensible film carrier,
- a layer SK1 composed of a self-adhesive composition arranged on one of the surfaces of the film carrier layer F and based on a vinylaromatic block copolymer composition foamed with microballoons,
- a layer SK2 composed of a self-adhesive composition arranged on the opposite surface of the film carrier layer F from the layer SK1 and based on a vinylaromatic block copolymer composition foamed with microballoons, where the mean diameter of the voids formed by the microballoons in the self-adhesive composition layers SK1 and SK2 is independently 20 to 60 μm.
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Citations
26 Claims
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1. A pressure-sensitive adhesive strip comprising three layers as follows:
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an inner layer F composed of a non-extensible film carrier, a layer SK1 composed of a self-adhesive composition arranged on a surface of layer F and based on a vinylaromatic block copolymer composition foamed with microballoons, a layer SK2 composed of a self-adhesive composition arranged on an opposite surface of layer F from layer SK1 and based on a vinylaromatic block copolymer composition foamed with microballoons, where a mean diameter of each of voids formed by the microballoons in layers SK1 and SK2 is independently 20 to 60 μ
m.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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6. The pressure-sensitive adhesive strip as claimed in claim 4, wherein
the vinylaromatics for formation of the A block include styrene, a-methylstyrene and/or styrene derivatives. -
7. The pressure-sensitive adhesive strip as claimed in claim 4, wherein
monomer for forming the B block is selected from the group consisting of butadiene, isoprene, ethylbutadiene, phenylbutadiene, piperylene, pentadiene, hexadiene, ethylhexadiene, dimethylbutadiene, and a mixture thereof. -
8. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
proportion of the vinylaromatic block copolymers, based on overall self-adhesive composition layer SK1 or SK2, totals at least 20% by weight, and at most 75% by weight. -
9. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layers SK1 and/or SK2 are formed on basis of vinylaromatic block copolymer and tackifying resin. -
10. The pressure-sensitive adhesive strip as claimed in claim 9, wherein
layer SK1 and/or SK2 includes 20% to 60% by weight of tackifying resin, based on the total weight of the self-adhesive composition layer. -
11. The pressure-sensitive adhesive strip as claimed in claim 9, wherein the tackifying resin, to an extent of at least 75% by weight, is hydrocarbon resin or terpene resin or a mixture thereof.
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12. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
proportion of the microballoons in layer SK1 and/or layer SK2 is up to 12% by weight, based in each case on overall composition of layer SK1 or layer SK2. -
13. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
mean diameter of the voids formed by the microballoons in layers SK1 and/or SK2, is 20 to 50 μ - m.
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14. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer SK1 and/or SK2 consists of the following composition: -
15. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer SK1 and/or SK2 consists of the following composition: -
16. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer SK1 and/or SK2 consists of the following composition: -
17. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer SK1 and/or SK2 have an absolute density of 400 to 990 kg/m3, and/or a relative density of 0.35 to 0.99. -
18. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer SK1 and/or SK2 have a thickness between 20 and 200 μ - m.
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19. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
one or both surfaces of layer F have been physically and/or chemically pretreated. -
20. The pressure-sensitive adhesive strip as claimed in claim 19, wherein
the pretreatment is an etching operation and/or a corona treatment and/or a primer treatment. -
21. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
materials used for layer F are polyesters. -
22. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer F has a thickness between 5 and 125 μ - m.
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23. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer F has an elongation at break of less than 300%. -
24. The pressure-sensitive adhesive strip as claimed in claim 1, wherein
layer F has a tensile strength in longitudinal direction of greater than 100 N/mm2, and/or a tensile strength in transverse direction of greater than 100 N/mm2. -
25. The pressure-sensitive adhesive strip as claimed in claim 1,
having a thickness of 45 μ - m to 4000 μ
m.
- m to 4000 μ
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26. A method of bonding components of accumulators or electronic devices, comprising application of a pressure-sensitive adhesive strip according to claim 1 to a substrate.
Specification