Hard coating film having multilayer-structure, and polyimide film comprising same

A hard coating film having a structure in which a highly bendable layer and a high-hardness layer are stacked on a substrate in that order,

• wherein the highly bendable layer has a Vickers hardness (Hv) of 40 or less,
• the high-hardness layer has a Vickers hardness (Hv) of 55 or more, and
• the hard coating film including the highly bendable layer and the high-hardness layer stacked on the substrate in that order has a Vickers hardness (Hv) of 20 to 65, and
• wherein the highly bendable layer comprises a siloxane resin obtained by polymerizing a compound comprising:
• at least one alkoxysilane selected from an alkoxysilane represented by the following Formula 1 and an alkoxysilane represented by the following Formula 2;
• and a diol represented by the following Formula 3:
• R1n(OR2)4-n <Formula 1>
• wherein R2 is a C1-C3 linear, branched or cyclic alkyl group substituted with epoxy or acryl, R2 is a C1-C8 linear, branched or cyclic alkyl group, and n is an integer of 1 to 3,
• Si(OR3)4 <Formula 2>
• wherein R3 represents a C1 to C4 linear or branched alkyl group,
• HO(CH2)nOH <Formula 3>
• wherein n is an integer of 1 to 10.