Coextruded pressure-sensitive adhesive tape and method of making
First Claim
1. A composite pressure-sensitive adhesive tape having two exterior surfaces of a normally tacky pressure-sensitive adhesive, the tape comprising a unified structure of first and second simultaneously melt processed pressure-sensitive adhesive layers each comprising an elastomeric polymer, and optionally a third simultaneously melt processed layer between said first and second pressure-sensitive adhesive layers, wherein said third layer is essentially free from the elastomeric polymer used in the pressure-sensitive adhesive used in said first and second pressure-sensitive adhesive layers, and further wherein at least one of said pressure-sensitive adhesive layers has been cross linked.
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Abstract
A unified, composite tape structure is provided. The tape comprises two outer pressure-sensitive adhesive layers joined via melt processing. A method of making the tape comprising the use of melt processing is also disclosed. In the method a plurality of layers are melt processed and simultaneously joined to form the unified composite.
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Citations
37 Claims
- 1. A composite pressure-sensitive adhesive tape having two exterior surfaces of a normally tacky pressure-sensitive adhesive, the tape comprising a unified structure of first and second simultaneously melt processed pressure-sensitive adhesive layers each comprising an elastomeric polymer, and optionally a third simultaneously melt processed layer between said first and second pressure-sensitive adhesive layers, wherein said third layer is essentially free from the elastomeric polymer used in the pressure-sensitive adhesive used in said first and second pressure-sensitive adhesive layers, and further wherein at least one of said pressure-sensitive adhesive layers has been cross linked.
- 13. A composite pressure-sensitive adhesive tape comprising first and second normally tacky pressure sensitive adhesive layers each comprising an elastomeric polymer and a carrier layer between said first and second pressure-sensitive adhesive layers, wherein said carrier layer is essentially free of the elastomeric polymer used in pressure-sensitive adhesive of either of said pressure-sensitive adhesive layers, and wherein all of said layers are simultaneously melt processed to form a unified structure.
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24. A composite pressure-sensitive adhesive tape construction having pressure-sensitive adhesive on both exterior surfaces thereof comprising two layers of a normally tacky pressure-sensitive adhesive each comprising an elastomeric polymer and a layer of an extrudable carrier therebetween, wherein said carrier layer is (a) thin relative to the thickness of at least one of said adhesive layers, and (b) essentially free from the elastomeric polymer used in the adhesive of either of said pressure-sensitive adhesive layers, and wherein each of said layers has been coextruded to form said tape.
- 28. A composite pressure-sensitive adhesive tape comprising a melt processed, unified construction having a layer of a pressure-sensitive adhesive comprising an elastomeric polymer on each surface of a central layer, said central layer comprising a blend of two or more polymers, said blend being essentially free from the elastomeric polymer used in the pressure-sensitive adhesive used in said pressure-sensitive adhesive layers.
- 31. A composite pressure-sensitive adhesive tape having two exterior surfaces of a normally tacky pressure-sensitive adhesive, the tape comprising a unified structure of first and second simultaneously melt processed pressure-sensitive adhesive layers each comprising an elastomeric polymer, and optionally a third simultaneously melt processed layer between said first and second pressure-sensitive adhesive layers, wherein said third layer is essentially free from the elastomeric polymer used in the pressure-sensitive adhesive used in said first and second pressure-sensitive adhesive layers, and further wherein the composite tape is oriented.
- 34. A composite pressure-sensitive adhesive tape having two exterior surfaces of a normally tacky pressure-sensitive adhesive, the tape comprising a unified structure of first and second simultaneously melt processed pressure-sensitive adhesive layers each comprising an elastomeric polymer, and a third simultaneously melt processed layer between said first and second pressure-sensitive adhesive layers, wherein said third layer is essentially free from the elastomeric polymer used in the pressure-sensitive adhesive used in said first and second pressure-sensitive adhesive layers.
Specification