Novel digital printing ink-jet inks with “antifraud markers” used as additives

Two stilbene derivatives, Kahablanc APU (C.I Fluorescent Brightener 220) and Kahablanc BA (C.I Fluorescent Brightener 113) were used as possible “antifraud markers”. These were added in several amounts in water-based disperse ink-jet inks. The surface tension, pH, viscosity and conductivity of the formulations prepared were monitored over a period of 90 days in order to estimate the ink stability and the compatibility of the “antifraud” active agents with the ink constituents. The inks were used for ink-jet printing of polyester and polyamide samples. Fastness and colour properties of the samples were measured. Qualitative and quantitative determination of the stilbene derivatives extracted from the printed samples was made and a simple spectrophotometrical method for their detection was proposed.

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► Preparation of ink-jet inks with fluorescent brighteners as antifraud markers.
► Surface tension, pH, conductivity, viscosity measurements and stability evaluation.
► Ink-jet printing on polyester and polyamide fibres.
► Quality control tests of the printed samples.
► Quantitative determination of the antifraud marking agents.