Development of High Durability Cyan and Magenta Dyes for Ink Jet Printing System

Water-soluble novel cyan and magenta dyes, which show high ozone-fastness and light-fastness on porous photo media, have been developed for inkjet printing systems. Control of dye energy levels, removal of groups sensitive towards ozone, and acceleration of copper-phthalocyanine complex (CuPc) aggregation were the dominant factors to significantly improve both ozone-fastness and light-fastness. For the development of the CuPc cyan skeleton, alkyl sulfonyl groups, all of which were located at beta positions on the CuPc skeleton, were effective in improving dye fastness. For the development of the magenta skeleton, a combination of aniline-substituted pyridine coupling component and pyrazole diazonium component was an inherently important skeleton to improve dye fastness. Derived from the de-aggregation compounds developed for silver halide photography, we succeeded in developing an anti-bronzing ink additive.