Composition for Forming Hard Coating Layer, Method of Preparing Hard Coating Film and Hard Coating Film Prepared by Using the Same

A preparation method of a hard coating film, the method comprising:

• preparing a composition for forming a hard coating layer including an epoxy siloxane resin, a crosslinking agent including a compound having an alicyclic epoxy group, a thermal initiator including a compound represented by the following Chemical Formula 2, and a photoinitiator;
• applying the composition for forming a hard coating layer on a substrate;
• irradiating the applied composition for forming a hard coating layer with ultraviolet rays;
• and
• thermally curing the composition for forming a hard coating layer irradiated with ultraviolet rays to form a complexly cured hard coating layer:
• wherein R3 is hydrogen, an alkoxycarbonyl group having 1 to carbon atoms, an alkylcarbonyl group having 1 to 4 carbon atoms, or an arylcarbonyl group having 6 to 14 carbon atoms, R4 is independently of each other hydrogen, halogen, or an alkyl group having 1 to 4 carbon atoms, n is 1 to 4, R5 is an alkyl group having 1 to 4 carbon atoms or an aralkyl group having 7 to carbon atoms which may be substituted by an alkyl group having 1 to 4 carbon atoms, R6 is an alkyl group having 1 to 4 carbon atoms, and X is SbF6, PF6, AsF6, BF4, CF3SO3, N(CF3SO2)2, or N(C6F5)4.