Composition for forming hard coating layer, method of preparing hard coating film and the hard coating film prepared by using the same

[0193] Relative to the total weight of the composition, the epoxysiloxane resin, crosslinking agent, thermal initiator, photoinitiator and solvent prepared in the preparation example were mixed in the weight ratio of the following Table 1 to prepare a hard coat layer. combination.

[0194] The composition for forming a hard coat layer was coated on a colorless polyimide (cPI) film having a thickness of 80 μm by the Meyer rod method, and was left to stand at a temperature of 60° C. for 5 minutes.

[0195] Using a high pressure metal lamp at 1J / cm 2 UV was irradiated and then cured at a temperature of 120° C. for 15 minutes to prepare a hard coat film forming a composite cured hard coat layer having a thickness of 30 μm.

[0197] Each component was mixed according to the following Table 1, and the composition for hard-coat layer formation was prepared.

[0198] The composition for forming a hard coat layer was coated on a cPI film having a thickness of 80 μm by the Meyer rod method, and left to stand at a temperature of 60° C. for 5 minutes.

[0199] Using a high pressure metal lamp at 1J / cm 2 UV was irradiated and then cured at a temperature of 120° C. for 15 minutes to form a composite cured hard coat layer with a thickness of 20 μm.

[0200] The hard coat layer forming composition was coated on the bottom surface of the cPI film on which the composite cured hard coat layer was not formed by the Meyer rod method, and left to stand at a temperature of 60° C. for 5 minutes. Afterwards, using a high-pressure metal lamp at 1J / cm 2 UV was irradiated to form a photocurable hard coat layer with a thickness of 5 μm, thereby preparing the hard coat films of Example 15 and Comparative Example 3.

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[0205] A hard coat film was prepared by the same method as in Example 15, but the thicknesses of the composite cured hard coat layer and the photocured hard coat layer were changed according to Table 2 below.

[0206] [Table 2]

[0207] distinguish Composite cured hard coat thickness (μm) Thickness of light-cured hard coat (μm) Example 15 20 5 Example 16 5 5 Example 17 5.5 5 Example 18 10 5 Example 19 30 5 Example 20 40 5 Example 21 50 5