Abstract: A process for making an ink jet ink comprising: a) providing a dispersion containing a pigment, an alcohol carrier and an amine-terminated polyether dispersant; b) mixing the pigment dispersion with rigid milling media less than 100 &mgr;m; c) introducing the mixture of step (b) into a mill; d) milling the mixture from step (c) until the pigment particle size is below about 100 nanometers; e) separating the milling media from the mixture milled in step (d); and f) diluting the mixture from step (e) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.

Abstract: An ink jet ink composition comprising from about 30 to about 90% by weight of an alcohol carrier, from about 0.5 to about 30% by weight of a pigment, from about 0.125 to about 7.5% by weight of an amine-terminated polyether dispersant, and from about 10 to about 50% by weight of a humectant.

Abstract: A process for making an ink jet ink comprising:a) providing a dispersion containing a pigment, a hydrocarbon carrier, and a polyamine/fatty acid condensation polymer dispersant;b) mixing the pigment dispersion with rigid milling media less than 100 .mu.

Abstract: The present invention provides method and apparatus to continuously operate a bead mill. At the outlet of the bead mill is a separator screen which prevents particles of a certain size from being discharged. After running the bead mill, the screen tends to get clogged with large sized particles. The present invention provides an ultrasonic probe that periodically cleans the screen when the pressure within the milling chamber reaches a predetermined value.