Composition for forming coating layer having self-healing property, coating layer, and film

A coating layer having a self-healing property comprising a binder layer in which a poly(C2-4 alkylene glycol)-modified polyfunctional urethane (meth)acrylate-based binder and a (meth)acrylate group of bifunctional or higher polyfunctional (meth)acrylate-based compound are bound to each other to form a cross-linked structure;

• a polycarbonate-modified bifunctional urethane (meth)acrylate-based binder which has a bifunctional urethane bond and each polycarbonate-modified (meth)acrylate-based compound is bound to the urethane bond in the polycarbonate-modified bifunctional urethane (meth)acrylate-based binder;
• and
• a silica nanoparticle dispersed in the cross-linked structure of the binder layer,
• wherein the binder layer has a cross-linking density of 5 mol/kg to 10 mol/kg,
• wherein the poly(C2-4 alkylene glycol)-modified polyfunctional urethane (meth)acrylate-based binder has a trifunctional or higher urethane bond and each poly(C2-4 alkylene glycol)-modified (meth)acrylate-based compound is bound to the urethane bond in the poly(C2-4 alkylene glycol)-modified polyfunctional urethane (meth)acrylate-based binder, and
• at least two poly(C2-4 alkylene glycol)-modified (meth)acrylate-based compounds bound to each urethane bond include poly(C2-4 alkylene glycol) repeating units whose numbers of repetitions are different from each other.