| abstract |
A printing system for applying a printing fluid to a substrate, comprising a printing fluid applicator and a recirculating printing fluid supply supplying printing fluid to the applicator, wherein the printing fluid comprises water, colorant, acrylic latex polymer, and a water dispersible polyurethane additive having an acid number greater than 50. The acrylic latex polymer provides increased optical density for printed images, and the water dispersible polyurethane additive enables the latex-containing printing fluid to be recirculated for extended periods without significant fluid destabilization or pressure build up or filter clogging. Also disclosed is method of continuous inkjet printing employing such a printing system. |