The present invention provides an ink composition for printing which comprises a blend of 100 parts by weight of a copolymer comprising a polycaprolactonepolyol, a diamine and a diisocyanate, 30 to 300 parts by weight of a novolac type epoxy resin, 30 to 300 parts by weight of a bisphenol type epoxy resin, 0.2 to 20 parts by weight of a thixotropic agent, 0.1 to 30 parts by weight of a defoaming agent, and 0.1 to 10 parts by weight of a leveling agent. It can be used for covering circuit boards.