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Light fastness of ink jet prints on modified conventional coatings

Production of color ink jet prints with excellent fastness properties generally requires the use of special coated papers. The use of modified conventional coating pigments has been suggested as a means to obtain a coating that would combine the good properties of silica-based ink jet coatings and conventional coatings. This study examined the light fastness of ink jet prints on modified conventional coatings using traditional measurements of physical paper properties and print quality, vibrational spectroscopy and multivariate data analysis methods. The properties of the coatings were altered by using different ratios of coating pigments and different types coating polymers. Experimental inks with a known composition were used for test printings. The results indicated that the effect of the PCC:kaolin ratio of the coating on light fastness is dependent on the ink-coating combination. With dye-based inks, the role of the structural properties of the coating decreased with an increase in the strength of the chemical paper-ink interactions. In general, the light fastness of pigmented ink was clearly better than that of dye-based inks. Furthermore, the dye-based inks seemed to benefit from a dense coating structure, provided that they had penetrated into the coating layer, whereas a coarse structure of the coating appeared to be advantageous for the pigmented inks. The role of chemical paper-ink interactions was found to be rather complex. However, some evidence of a partial degradation of the colorant molecule was obtained. The effect of the coating composition on photo-fading remained ambiguous, but the interactions between the colorant and the coating polymers nevertheless seem to play an important role.