| abstract |
The present invention provides a coating agent containing a water-based resin composition (D) and a carbodiimide crosslinking agent (E), wherein the water-based resin composition (D) is made of vinyl ester resin (A) obtained by dispersing a urethane resin (B) having an aromatic ring in an aqueous medium (C); the vinyl ester resin (A) is obtained by reacting an epoxy resin (a1) with a compound (a2) wherein, the epoxy resin (a1) is at least one selected from the group consisting of novolac epoxy resins and bisphenol epoxy resins, and the compound (a2) has acid groups and polymerizability a saturated group; the urethane resin (B) is obtained by reacting a polyol (b1) containing a polyol (b1-1) and a polyol (b1-2) with a polyisocyanate (b2), wherein, The polyol (b1-1) has an aromatic ring, and the polyol (b1-2) has a hydrophilic group. The coating agent of the present invention can improve the adhesion between the base material and the cured coating film of the active energy ray-curable composition, and can form an undercoat layer excellent in chemical resistance and heat-and-moisture resistance. |