Abstract: Disclosed is an aqueous ink composition including between 1 and 40 weight % of a water dispersible resin, between 0.5 and 15 weight % of a colorant, between 20 and 80 weight % of water and between 1 and 30 weight % of an acetal cosolvent, wherein all amounts are relative to the total ink composition. The ink composition may further include between 15 and 75 weight % of a dispersion stabilizing cosolvent.

Abstract: An ink composition includes a dispersion of resin particles in water, a colorant and a co-solvent fraction for stabilizing the dispersion, wherein the co-solvent fraction includes at least one branched polyhydric alcohol and/or at least one (poly)ether modified branched polyhydric alcohol, and between 0.1 and 5 weight % polyvinylpyrrolidone having a weight average molecular weight of at least 5000 g/mol. Such ink compositions show improved robustness on a range of print substrates. In this way robust look and feel films can be realized also on less absorbing media, like the offset coated gloss, silk and matt ones with a better freedom towards recipe variation of e.g. latex and the concentrations of the ingredients.

Abstract: Disclosed is an aqueous ink composition including between 1 and 40 weight % of a water dispersible resin, between 0.5 and 15 weight % of a colorant, between 20 and 80 weight % of water and between 1 and 30 weight % of an acetal cosolvent, wherein all amounts are relative to the total ink composition. The ink composition may further include between 15 and 75 weight % of a dispersion stabilizing cosolvent.

Abstract: The present invention relates to an ink composition suitable for being ejected from an inkjet marking device at an operating temperature. The ink composition comprises a water-dispersible resin and has a dynamic surface tension of below 35 mN/m and a static surface tension of above 21 mN/m both determined at the operating temperature. The ink composition may comprise a mixture of water-soluble organic solvents having a difference in the relative dielectric constant of more than 5, preferably between 10 and 50. The ink composition may comprise a polymeric cosolvent, in particular a polyethylene glycol or polyethylene glycol (di)methyl ether. The ink composition may comprise a mixture of surfactants comprising at least one surfactant of a first type selected from the group consisting of acetylene glycols and ethoxylated acetylene glycols and at least one surfactant of a second type selected from the group consisting of silicone surfactants and fluorochemical surfactants.

Abstract: An inkjet printer having a print head mounted on a carriage and an off-carriage ink reservoir, the carriage being arranged for moving the print head relative to a receiving medium, wherein the printer includes a hose for connecting the print head to the reservoir to enable the supply of ink from the reservoir to the print head, the hose having a multi-layered wall, containing an intermediate poly-urethane compound containing layer disposed between low density poly-ethylene compound-containing layers.

Abstract: A printing apparatus containing a printhead, an ink reservoir and a flexible hose for transporting fluid ink from the ink reservoir to the printhead, wherein the flexible hose has a wall which, during the transportation of the ink, is in contact with the ink, said wall being made of a material which is impermeable or almost impermeable to water and air, and in additional is substantially resistant to carbon-containing ink.

Abstract: A printing apparatus containing a printhead, an ink reservoir and a flexible hose for transporting fluid ink from the ink reservoir to the printhead, wherein the flexible hose has a wall which, during the transportation of the ink, is in contact with the ink, said wall being made of a material which is impermeable or almost impermeable to water and air, and in additional is substantially resistant to carbon-containing ink.