Multi-layer adhesive tape

1. A multilayer adhesive tape sequentially comprising:

a first outer adhesive layer;

an intermediate adhesive layer;

a second outer adhesive layer;

a first interface mixture layer provided between the first outer adhesive layer and the intermediate adhesive layer; and

a second interface mixture layer provided between the second outer adhesive layer and the intermediate adhesive layer,

wherein attaching force among the first outer adhesive layer, the intermediate adhesive layer, and the second outer adhesive layer is maintained after the multilayer adhesive tape is treated in liquefied nitrogen for 15 seconds,

wherein a thickness ratio of the first outer adhesive layer to the intermediate adhesive layer and a thickness ratio of the second outer adhesive layer to the intermediate adhesive layer are each 1:0.8 to 1:1.4, and

wherein the multilayer adhesive tape is prepared by sequentially laminating a first outer adhesive composition, an intermediate adhesive composition, and a second outer adhesive composition, and

then simultaneously curing the first outer adhesive composition, the intermediate adhesive composition, and the second outer adhesive composition,

wherein the first interface mixture layer is prepared by liquid mixing at an interface between the first outer adhesive composition and the intermediate adhesive composition and

the second interface mixture layer is prepared by liquid mixing an interface between the intermediate adhesive composition and the second outer adhesive composition,

wherein the intermediate adhesive layer comprises an intermediate adhesive polymer comprising: a polymerization unit of an alkyl group-containing (meth)acrylate monomer; a polymerization unit of a cycloalkyl group-containing (meth)acrylate monomer; and a polymerization unit of a polar functional group-containing monomer, and

wherein the first outer adhesive layer and the second outer adhesive layer each independently comprise an outer adhesive polymer comprising: a polymerization unit of an alkyl group-containing (meth)acrylate monomer; and a polymerization unit of a polar functional group-containing monomer.

2. The multilayer adhesive tape of claim 1 , wherein the first interface mixture layer comprises both a material constituting the first outer adhesive layer and a material constituting the intermediate adhesive layer, and the second interface mixture layer comprises both a material constituting the second outer adhesive layer and a material constituting the intermediate adhesive layer.

3. The multilayer adhesive tape of claim 1 , wherein a glass transition temperature of the intermediate adhesive layer is higher than glass transition temperatures of the first outer adhesive layer and the second outer adhesive layer, and

a difference between the glass transition temperature of each of the first outer adhesive layer and the second outer adhesive layer and the glass transition temperature of the intermediate adhesive layer is 5° C. or more and 40° C. or less.

4. The multilayer adhesive tape of claim 1 , wherein the intermediate adhesive layer has a thickness of 30 μm or more and 100 μm or less.

5. The multilayer adhesive tape of claim 1 , wherein a content of the polymerization unit of the cycloalkyl group-containing (meth)acrylate monomer is more than 0 part by weight and 30 parts by weight or less based on 100 parts by weight of the intermediate adhesive polymer.

6. The multilayer adhesive tape of claim 1 , wherein a content of the polymerization unit of the polar functional group-containing monomer is 5 part by weight or more and 20 parts by weight or less based on 100 parts by weight of the intermediate adhesive polymer.

7. The multilayer adhesive tape of claim 1 , wherein a content of the polymerization unit of a polar functional group-containing monomer is more than 0 part by weight and 20 parts by weight or less based on 100 parts by weight of the outer adhesive polymer of at least one of the first outer adhesive layer or the second outer adhesive layer.

8. The multilayer adhesive tape of claim 1 , wherein the outer adhesive polymer of at least one of the first outer adhesive layer or the second outer adhesive layer further comprises a polymerization unit of a heterocycloalkyl group-containing (meth)acrylate monomer.

9. The multilayer adhesive tape of claim 8 , wherein the heterocycloalkyl group-containing (meth)acrylate monomer is one or more selected from the group consisting of tetrahydrofurfuryl acrylate (THFA), tetrahydrofurfuryl methacrylate, tetrahydropyranyl acrylate (THPA), acryloyl morpholine, and cyclictrimethylol-propaneformalacrylate (CTFA).

10. The multilayer adhesive layer of claim 8 , wherein a content of the polymerization unit of the heterocycloalkyl group-containing (meth)acrylate monomer is 1 part by weight or more and 15 parts by weight or less based on 100 parts by weight of the outer adhesive polymer of at least one of the first outer adhesive layer or the second outer adhesive layer.

11. The multilayer adhesive tape of claim 1 , wherein the alkyl group-containing (meth)acrylate monomer is one or more selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, isobornyl methyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, pentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 2-methylhexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, n-octyl (meth)acrylate, and isooctyl (meth)acrylate.

12. The multilayer adhesive tape of claim 1 , wherein the cycloalkyl group-containing (meth)acrylate monomer is one or more selected from the group consisting of cyclohexyl acrylate (CHA), cyclohexyl methacrylate (CHMA), isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA), isobornyl methyl(meth)acrylate, and 3,3,5-trimethylcyclohexylacrylate (TMCHA).

13. The multilayer adhesive tape of claim 1 , wherein the polar functional group-containing monomer is one or more monomers selected from the group consisting of a hydroxyl group-containing monomer, a carboxyl group-containing monomer, and a nitrogen-containing monomer.

14. A method of preparing the multilayer adhesive tape of claim 1 , comprising:

sequentially laminating a first outer adhesive composition, an intermediate adhesive composition, and a second outer adhesive composition, and

then simultaneously curing the first outer adhesive composition, the intermediate adhesive composition, and the second outer adhesive composition.