The present invention provides a hard coating film having high hardness and excellent properties. The hard coating film has high hardness and is not easily curled.

The invention describes novel coating agents that include a polymer, one or more latent reactive groups and one or more noncovalent linking groups, the noncovalent linking groups selected to interact with a substrate to which the coating agent is applied. The coating agents are useful for providing a coating that can be further functionalized (for example, by application of additional coating layers), or for providing desirable properties to a surface.

The present invention relates to a polar group-containing olefin copolymer (A) which is produced through polymerization using a transition metal catalyst, which has a weight-average molecular weight falling within a specific range and which contains a polar group-containing monomer within a specific range; a multinary polar olefin copolymer (A) indispensably containing a polar monomer component that has a norbornene skeleton and a carboxyl group or an acid anhydride group and having three or more types of monomer units; and a resin composition (C) containing a specific amount of a polar group-containing olefin copolymer (A) and a specific amount of an olefin resin (B).

A method of preparing a hard coating film by applying a first hard coating composition onto one side of a supporting substrate, performing a first photocuring by irradiating one side of the supporting substrate, applying a second hard coating composition onto the other side of the supporting substrate, performing a second photocuring by irradiating the other side of the supporting substrate which the second coating composition applied on, with ultraviolet having a first wavelength and a second wavelength longer than the first wavelength.

The present invention relates to a hard coating composition, and, more particularly, to a hard coating composition used in forming a hard coating film exhibiting high hardness and excellent properties. The hard coating composition can be used to form a high-hardness hard coating film that is not easily curled.

A method of preparing a hard coating film by applying a hard coating composition onto both sides of a supporting substrate, thereby forming a hard coating layer on each side of the supporting substrate, the hard coating composition comprising a binder including a tri- to hexa-functional acrylate-based monomer, inorganic particles and a photoinitiator; and irradiating the applied hard coating layers with ultraviolet to simultaneously photocure the hard coating layers, wherein the hard coating film has a pencil hardness of 7H or more under a load of 1 kg, and properties such that when the hard coating film is exposed to a temperature of 50 to 90 C. and a humidity of 80 to 90% for 70 to 100 hours and then placed on a plane, the maximum distance at which each edge of the hard coating film is spaced apart from the plane is 1.0 mm or less.

The invention describes novel coating agents that include a polymer, one or more latent reactive groups and one or more noncovalent linking groups, the noncovalent linking groups selected to interact with a substrate to which the coating agent is applied. The coating agents are useful for providing a coating that can be further functionalized (for example, by application of additional coating layers), or for providing desirable properties to a surface.

The invention describes novel coating agents that include a polymer, one or more latent reactive groups and one or more noncovalent linking groups, the noncovalent linking groups selected to interact with a substrate to which the coating agent is applied.