| abstract |
(57) [Problem] To provide an aqueous ultraviolet curable ink composition which forms a cured film excellent in adhesion, hardness, surface gloss, solvent resistance and water resistance. A (meth) acrylate having a carboxyl group or a monomer having an ethylenically unsaturated group is polymerized at a high temperature to obtain a number average molecular weight of 1,000 to 1,000. After dissolving or dispersing a polymer (a) having an acid value of 15,000 and an acid value of 100 to 300 mgKOH / g in an alkaline aqueous solution, an (meth) acrylate having an epoxy group is added in the alkaline aqueous solution to obtain an acid value of 20 to 200mgK An aqueous dispersion (A dp ) of an OH / g reactive resin (A); It comprises a polyfunctional (meth) acrylate (B) of a polyol to which 1 to 10 moles of an alkylene oxide is added, and a photoinitiator (C). Since the aqueous dispersion (A dp ) is used, the composition has a low viscosity, and since the reactive resin (A) having a relatively high molecular weight is used, a cured film having little curing shrinkage and excellent in adhesion can be obtained. |