Thermal transfer film, method for manufacturing same, and organic electroluminescent element manufactured by using thermal transfer film

1. A thermal transfer film comprising:

a base film having a first surface and a second surface opposing the first surface;

a light-to-heat conversion layer formed on the first surface of the base film; and

a coating layer formed on the second surface of the base film,

wherein the coating layer is a fluorine-based coating layer.

2. The thermal transfer film according to claim 1 , wherein the light-to-heat conversion layer has a surface roughness Rqv of about 50 nm or less.

3. The thermal transfer film according to claim 1 , wherein the light-to-heat conversion layer has a surface roughness Rq of about 5 nm or less.

4. The thermal transfer film according to claim 1 , wherein the coating layer has a haze of about 2% or less.

5. The thermal transfer film according to claim 1 , wherein the coating layer has a thickness of about 5 μm or less.

6. The thermal transfer film according to claim 1 , wherein the coating layer is formed of a composition comprising a UV curable resin, a polyfunctional monomer, an initiator, and a UV curable fluorine compound.

7. The thermal transfer film according to claim 6 , wherein the UV curable fluorine compound is represented by Formula 1,

(CH 2 ═CR 1 —C(═O)—O) 2 R f   <Formula 1>

(wherein R 1 is a hydrogen atom, or a linear or branched C 1 to C 5 alkyl group, and R f has one structure of Formulae a to e:

wherein * is a binding site for CH 2 ═CR 1 —C(═O)—O represented by Formula 1;

R F1 is a linear or branched C 1 to C 10 fluoroalkylene group, or a linear or branched C 1 to C 10 perfluoroalkylene group; and

R F2 , R F3 , R F4 , R F5 are each independently a hydrogen atom, a linear or branched to C 14 fluoroalkyl group, or a linear or branched C 1 to C 14 perfluoroalkyl group.

8. The thermal transfer film according to claim 1 , wherein the coating layer comprises a cured product of a composition comprising about 40 wt % to about 90 wt % of a UV curable resin, about 5 wt % to about 45 wt % of a polyfunctional monomer, optionally about 10 wt % or less of a UV curable fluorine compound, and about 0.1 wt % to about 5 wt % of an initiator.

9. The thermal transfer film according to claim 1 , further comprising:

a protection layer on an upper side of the light-to-heat conversion layer.

10. The thermal transfer film according to claim 9 , wherein the protection layer has a surface roughness Rqv of about 50 nm or less.

11. The thermal transfer film according to claim 9 , wherein the protection layer has a surface roughness Rq of about 5 nm or less.

12. The thermal transfer film according to claim 1 , wherein the base film comprises at least one of polyester resins, polyacrylic resins, polyepoxy resins, polyolefin resins, and polystyrene resins.

13. A method for manufacturing the thermal transfer film according to claim 1 , comprising:

coating a composition for the coating layer onto the second surface of the base film;

coating a composition for the light-to-heat conversion layer onto the first surface of the base film; and

curing the composition for the coating layer and the composition for the light-to-heat conversion layer.

14. The method according to claim 13 , further comprising: winding the thermal transfer film on a roll.

15. The method according to claim 13 , further comprising: coating a composition for a protective layer after coating the composition for the light-to-heat conversion layer.

16. The method according to claim 13 , further comprising: separating the coating layer from the thermal transfer film.

17. An organic electroluminescent device manufactured using the thermal transfer film according to claim 1 .