Polymer film, flexible light emitting element display device, and rollable display device
The present invention relates to a polymer film containing a binder resin and polyrotaxane having a specific structure, and a flexible light emitting element display device and a rollable display device including the coating film.
1. A polymer film comprising:
a binder resin having a weight average molecular weight of 30,000 to 800,000; and
a polyrotaxane including a macrocycle to which a lactone-based compound is bonded, a linear molecule penetrating into the macrocycle, and a blocking group arranged at both ends of the linear molecule to prevent the macrocycle from being separated,
wherein a rate of a polyrotaxane in which an end of the lactone-based compound is substituted by a (meth)acrylate-based compound in the entire polyrotaxane is 40 mol % to 70 mol %, and
the polymer film is bent over a mandrel having a diameter of 10 mm or less without cracking in a mandrel test.
2. The polymer film of claim 1 , wherein
the polymer film has sufficient flexibility to be bent over a cylindrical steel mandrel having a diameter of 7.0 mm or less without cracking at the time of performing measurement according to ASTM Standard D522-93A method B.
3. The polymer film of claim 1 , wherein
the polymer film has a thickness of 5 μm to 100 μm.
4. The polymer film of claim 1 , wherein
elongation measured according to ASTM D638 at room temperature is 5% to 500%.
5. The polymer film of claim 1 , wherein
the polymer film has light transmittance of 92.0% or more and haze of 0.9 or less.
6. The polymer film of claim 1 , wherein
the polymer film is used as a substrate, an external protective film, or a cover window of a light emitting element display device.
7. The polymer film of claim 1 , wherein
the polymer film has a glass transition temperature of −80° C. to 100° C.
8. The polymer film of claim 1 , wherein
the binder resin includes at least one selected from a group consisting of a (meth)acrylate-based polymer, a urethane (meth)acrylate-based polymer, a polyurethane resin, and a silicone-epoxy copolymer having a (meth)acrylate group introduced at an end thereof.
9. The polymer film of claim 1 , wherein
the macrocycle includes at least one selected from a group consisting of α-cyclodextrin, β-cyclodextrin, and γ-cyclodextrin.
10. The polymer film of claim 1 , wherein
the lactone-based compound is directly bonded to the macrocycle or bonded to the macrocycle via a straight or branched oxyalkylene group having 1 to 10 carbon atoms.
11. The polymer film of claim 1 , wherein
a residue of the lactone-based compound includes a functional group of the following Chemical Formula 1:
wherein, in Chemical Formula 1, m is an integer of 2 to 11, and n is an integer of 1 to 20.
12. The polymer film of claim 1 , wherein
the (meth)acrylate-based compound is directly bonded to the end of the lactone-based compound or bonded to the end of the lactone-based compound via a urethane bond, an ether bond, a thioester bond, or an ester bond.
13. The polymer film of claim 1 , wherein
a residue of the (meth)acrylate-based compound bonded to the end of the lactone-based compound includes a functional group of the following Chemical Formula 2:
wherein, in Chemical Formula 2, R 1 is hydrogen or methyl, and R 2 is a straight or branched alkylene group having 1 to 12 carbon atoms, a cycloalkylene group having a 4 to 20 carbon atoms, or an arylene group having 6 to 20 carbon atoms, and
* means a binding site.
14. The polymer film of claim 1 , wherein
the linear molecule is a polyoxyalkylene-based compound or a polylactone-based compound.
15. The polymer film of claim 1 , wherein
the linear molecule has a weight average molecular weight of 1000 to 50,000.
16. The polymer film of claim 1 , wherein
the blocking group includes at least one functional group selected from a group consisting of a dinitrophenyl group, a cyclodextrin group, an adamantane group, a trityl group, a fluorescein group, and a pyrene group.
17. The polymer film of claim 1 , wherein
the polyrotaxane has a weight average molecular weight of 100,000 to 800,000.
18. The polymer film of claim 1 , wherein
the polymer film contains the polyrotaxane at a content of 1 wt % to 50 wt % based on the entire weight of the polymer film.
19. The polymer film of claim 1 , wherein
the polymer film has a crosslinked structure between the binder resin and the polyrotaxane.
20. The polymer film of claim 1 , wherein
the polymer film contains a multifunctional acrylate-based compound forming a crosslink bond with at least one of the binder resin and the polyrotaxane.
21. A flexible light emitting element display device comprising the polymer film of claim 1 .
22. The flexible light emitting element display device of claim 21 , wherein the flexible light emitting element display device includes the polymer film as a substrate, an external protective film, or a cover window.
23. The flexible light emitting element display device of claim 21 , wherein the flexible light emitting element display device includes a cathode providing electrons, an electron transport layer, an emission layer, a hole transport layer, and an anode providing holes, and
the polymer film is bonded to at least one surface of the cathode or the anode.
24. A rollable display device comprising the polymer film of claim 1 .
25. The rollable display device of claim 24 , wherein the rollable display device includes the polymer film as a substrate, an external protective film, or a cover window.