Swelling tape for filling gap
View Patent ↗The present application relates to a swelling tape and a method of filling a gap. The swelling tape is, for example, applied in gaps in which a fluid is present and deformed into a three-dimensional shape to fill the gaps and fix in place objects separated by gaps as needed.
1. A swelling tape for filling a gap, comprising:
a substrate layer that is deformed in a length direction upon contact with a fluid;
a pressure-sensitive adhesive layer formed in a direction parallel to the length direction of the substrate layer on one surface of the substrate layer, and satisfying Equation 1; and
a back-side coating layer present on a surface opposite to the surface of the substrate layer on which the pressure-sensitive adhesive layer is formed,
wherein the substrate layer has a shore A hardness according to ASTM D2240 of 70 A or more, or the substrate layer has a shore D hardness according to JIS K-7311 of 40 D or more, wherein the recited hardnesses are maintained after the substrate is in contact with the fluid,
wherein the back-side coating layer comprises at least one selected from the group consisting of a fluorine-based releasing agent, a silicon-based releasing agent, a releasing agent containing silicon and having a vinyl or acrylic group, and an amide-based releasing agent:
1.5≤ X 2 /X 1 ≤150 [Equation 1]
where X 1 is a peeling strength of the pressure-sensitive adhesive layer measured at room temperature, and at a peeling rate of 5 mm/sec and a peeling angle of 180 degrees with respect to the surface opposite to the surface of the substrate layer on which the pressure-sensitive adhesive layer is formed, and X 2 is a peeling strength measured with respect to glass at room temperature and at a peeling rate of 5 mm/sec and a peeling angle of 180 degrees,
wherein the X 1 is 20 gf/25 mm or less.
2. The swelling tape for filling a gap of claim 1 , wherein the swelling tape is deformed into a three-dimensional shape having a height of 0.001 mm to 2.00 mm in a direction perpendicular to the length direction of the substrate layer upon contact with the fluid.
3. The swelling tape for filling a gap of claim 1 , wherein the substrate layer has a deformation ratio in the length direction according to Equation 2 of 10% or more:
Deformation ratio in length direction=( L 2 −L 1 )/ L 1 ×100 [Equation 2]
where L 1 is an initial length before the substrate layer is in contact with the fluid, and L 2 is a length of the substrate layer measured at room temperature or 60° C. after the substrate layer has been in contact with the fluid for 24 hours.
4. The swelling tape for filling a gap of claim 1 , wherein the substrate layer comprises thermoplastic polyurethane.
5. The swelling tape for filling a gap of claim 1 , wherein the pressure-sensitive adhesive layer comprises an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, an epoxy pressure-sensitive adhesive, a silicon pressure-sensitive adhesive, or a rubber pressure-sensitive adhesive.
6. The swelling tape for filling a gap of claim 1 , wherein the pressure-sensitive adhesive layer comprises an acrylic polymer crosslinked with a multifunctional crosslinking agent.
7. The swelling tape for filling a gap of claim 1 , wherein the pressure-sensitive adhesive layer is attached to and wound around the surface opposite to the surface of the substrate layer on which the pressure-sensitive adhesive layer is formed.
8. The swelling tape for filling a gap of claim 1 , wherein the X 2 is 100 gf/25 mm or more.
9. A method of filling a gap formed between a first substrate and a second substrate spaced apart from the first substrate, comprising:
attaching the pressure-sensitive adhesive layer of the swelling tape of claim 1 to the first or second substrate; and
contacting the substrate layer of the swelling tape of claim 1 with a fluid.
10. The method of filling a gap of claim 9 , wherein either one of the first and second substrates is an electrode assembly, and the other is a can encasing the assembly.
11. An electrode assembly having a circumferential surface to which the swelling tape of claim 1 is attached.
12. A battery, comprising:
the electrode assembly of claim 11 ;
a can encasing the assembly; and
an electrolyte in contact with the assembly in the can.
13. The battery of claim 12 , wherein the swelling tape of the electrode assembly fixes the assembly to an inside of the can by deforming into a three-dimensional shape upon contact with the electrolyte.
14. The battery of claim 13 , wherein the electrolyte is a carbonate-based electrolyte.