Abstract: Ink jet printer dispersion inks are provided which contain a dispersant having basic or acid groups and a non-destabilizing amount of a neutralizer for said groups. The inks exhibit improved non-wetting characteristics leading to lengthening of the duration of periods of continuous printing that can be achieved before cleaning or replacement of the nozzle plate of the ink jet print head is required.

Abstract: Ink jet printer dispersion inks are provided which contain a dispersant having basic or acid groups and a non-destabilizing amount of a neutralizer for said groups. The inks exhibit improved non-wetting characteristics leading to lengthening of the duration of periods of continuous printing that can be achieved before cleaning or replacement of the nozzle plate of the ink jet print head is required.

Abstract: A dispersion ink for ink jet printing and which is stable and produces good quality print on plain paper for extended periods of time without the need to interrupt printing to clean the print head, comprises a diluent containing a non-polar component, a pigment and a dispersant for stabilizing the dispersion of the pigment in the diluent, and has a polar solubility parameter greater than 0 but not greater than 7.0 MPa.sup.1/2 and a dewetting velocity of at least 100 .mu.m.sec.sup.-1, measured on a surface having a surface energy of 10.+-.1 mN.m.sup.-1.

Abstract: An ink jet printer ink of the kind comprising a dispersion of a pigment in a non-aqueous diluent wherein the diluent is a single phase liquid comprising a major amount of aliphatic hydrocarbon and a minor amount of a polar component, comprising oleyl alcohol alone or in combination with a least one other polar liquid such as an ether or an ester.