A plastic film having an active energy ray-curable film with a non-water based primer and a plastic film having a thin film of the active energy ray-curable

The present invention provides a method capable of forming a primer layer in a short period of time, new non-water-based primer, both the primer layer and the plastic film and the cured film formed by the active energy ray curable material adhesion and moisture resistance. Polyisocyanates having a branched-chain polyester resin is a hydroxyl group (A), compound (B) an active energy ray polymerizable functional group and a hydroxyl group and having at least three isocyanate groups (: as a primer, using a composition comprising the following components C).