An ink containing an azo dye having, in total, at least 13 conjugated .pi. electrons in an aromatic ring thereof that is not directly bonded to any azo group.

Ink for an ink jet printer comprises a microdisperse three-phase system having two liquid phases and one solid phase, the pigment. The ink exhibits a high indelibility and a low tendency towards the formation of microprecipitates.

An ink composition for ink-jet printing, capable of producing a high-quality image without causing blur, comprising, as essential components, a coloring component and a dispersion medium in which the coloring component is homogeneously dispersed and retained, characterized in that the coloring component is insoluble in the dispersion medium and is dispersed therein in the state of finely divided particles of a size of 0.01 .mu.m or more, that the dispersion medium comprises a liquid having a sur...

An ink composition, preferably for ink jet printing, contains a liquid carrier, a colorant, and a polyalkyleneimine/alkylene oxide block copolymer, preferably polyethyleneimine/propylene oxide/ethylene oxide block copolymer, and/or a primary or secondary polyoxyalkylene amine.

Fast drying ink compositions contain a colorant, a dye, water and a cosolvent. Some of the ink compositions dry in less than about 1 second and have a viscosity of between about 1.6 and about 2.5 centipoise and a specified surface tension. Some of the ink compositions contain specified cosolvents, preferably a mixture of diethylene glycol monobutyl ether and glycerol.

A printing ink is disclosed. The ink comprises (a) a reactive resin combined with a second resin comprising a substantially anhydrous water-soluble thermosetting stable methylated urea-formaldehyde resin wherein the weight of the methoxyl substituents therein is between 28% and 40% of the weight of the resin and the molar ratio of the reacted formaldehyde in the resin to the methoxyl substituents is such that in the absence of organic solvent the resin at 25.degree. C. is soluble to the extent o...

A novel ink fountain comprises a fountain roller radially approached by an ink supporting doctor blade. In order to retain low viscosity inks in the fountain, the blade must approach very closely to the fountain roller surface without touching it. To accommodate the potentially irregular surface of fountain rollers, the blade is rendered transversely deflectable in segments by means of cut-outs, and vernier adjustment means acting on the segments may be used to conform the blade closely to the r...

An apparatus for controlling the flow of ink in the nozzle of an ink ejector head, the latter having an ink flow system which has a chamber capable of being supplied with ink and a nozzle through which ink is ejected as well as a pressure producer capable of being subjected to pulses for applying pressure on the ink in the chamber so as to cause the ink to be ejected through the nozzle. The pressure producer has applied to it a series of pulses consisting of alternating primary and secondary pul...

A self driven mobile assembly including an ink agitator is supported on the ink fountain of a printing machine by a beam which is adapted to be mounted parallel to the longitudinal axis of the ink fountain so as to provide a guide track for supporting the mobile assembly for linear displacement along the ink fountain with the ink agitator projecting into the ink. The beam has a rack extending parallel to said ink fountain axis, and the mobile assembly includes a reversible motor and drive means ...

An ink for marking any fabric, which fades to disappear after use, employs a phthalein color. The fading time which is suitable for the marking ink can be regulated by the addition of ethanolamines and lower alcohols so that the phthalein color disappears naturally after from several hours to about 10 days. When a suitable ink for marking is used to mark a fabric, sewing may be followed according to the mark, and the mark disappears after a lapse of a determined time after the sewing operation i...