Infrared absorptive intaglio inks

摘要

An infrared absorptive intaglio ink according to the present invention comprises 20-40 wt% of varnish, 30-50 wt% of pigments, 1-3 wt% of modified carbon black, 5-10 wt% of mixing wax, 1-3 wt% of aliphatic hydrocarbon, 1-3 wt% of glycol ether solvents, 1-3 wt% of glycol ether based solvents, 2-10 wt% of surfactants and 1-3 wt% of additives. The infrared absorptive intaglio ink according to the present invention prevents the blocking of a printed matter without drying time delay according to the increase in storing time by coating the surface of carbon black which is a low-priced infrared absorptive material with titanium dioxide or silicon dioxide and is able to significantly reduce manufacture costs. Additionally, the infrared absorptive intaglio ink according to the present invention has excellent printability in a high speed printing machine by a water-soluble intaglio method, and is able to increase the service life of securities or banknotes manufactured by preventing discoloration according to the yellowing of an ink by additionally adding an alkali resistance composition.