Abstract: Ink for an electrostatic ink jet printer in which, inter alia, the ink and its insulative solvent and color material particle have the following properties: the ink has a volume resistivity of 109 to 1012 &OHgr;cm and a viscosity of 2 to 20 cp; the insulative solvent has a volume resistivity equal to or more than 1010 &OHgr;cm; and the color material particle has an average diameter of between 0.1 and 2 &mgr;m, an absolute value for the ratio (&xgr; electric potential/viscosity) between 10 to 100 (mV/cp), and an absolute value for the &xgr; electric potential of 30 mV to 200 mV. By means of these conditions, the ink provides higher density images, especially at faster printing speeds.

Abstract: A method of printing an image on a substrate with an ink jet printer, the method including the step of ejecting a plurality of discrete portions of ink from the ink jet printer toward the substrate, the ink including at least three different inks with each ink of each different pair of inks containing either different dyes or different concentrations of the same dye, and the step of sequentially forming a plurality of layers of ink dots on the substrate using the discrete portions of ink, with adjacent layers having overlapping ink dots formed of different inks, the plurality of layers of ink dots constituting the image, and the image fully covering all portions of the substrate beneath the image.

Abstract: Provided is a process for the formation of an image employing a liquid composition and a colored ink in combination to form a colored image on a recording medium, comprising using at least a magenta ink as the colored ink, wherein said magenta ink provides an image of magenta color, which satisfies all color senses represented by the following equations: {square root over ((a1+L *)2+L +(b1+L *)2+L )}≧{square root over ((a0+L *)2+L +(b0+L *)2+L )}  (I), 40≦L1*≦80  (II), 50≦a1*≦70  (III), and −30≦b1*≦5  (IV), where in the formulae (I), (II), (III) and (IV), L1*, a1*, b1*, a0* and b0* each represent a colorimetric value which is defined in the CIE 1976 (L*a*b*) color space; a1* and b1* each represent a colorimetric value of the image, which is obtained by using a liquid composition and a colored ink on a test paper having a whiteness of from 78 to 84, in accordance with JIS P 8123, measured by a Hunter Whiteness meter, and a chroma

Abstract: Disclosed herein is a novel hot melt ink comprising a colorant ink and an ink vehicle wherein the ink vehicle comprises at least one polyhedral silsesquioxane compound present in a proportion of about 0.1 to 30 wt % based on the total weight of the hot melt ink composition.

Abstract: Disclosed is a water in oil type emulsion ink used for stencil printing, rarely causing a strike through phenomenon, and being capable of providing an excellent printed images; the emulsion ink comprising an oil phase and a water phase, the lightness of the light transmitted through the oil phase in the range of visible light (380 to 800 nm) being 90.0 or higher in a condition that the oil phase does not include a component of coloring agent, and the ratio by weight of the oil phase to the water phase (oil phase/water phase) being 10 to 70/90 to 30.

Abstract: Water-fastness in aqueous ink-jet inks containing water-soluble dyes is achieved by using a specific ionic species having a charge opposite to that on the dye molecule. Anionic dyes typically contain sulfonate (or carboxylate) anionic groups. Using at least one specific ionic species of opposite charge, specifically, phosphonium salts, causes the colorant components to “crash” or precipitate out of the water-based ink onto the print medium due to the formation of a suitable charge complex between the ionic parts of the dye and the opposite charge of the counter-ion species. Other positively charged salts, such as quaternary ammonium salts, carbonium salts, iodonium salts, sulfonium salts, and pyrillium salts may be used to improve aqueous dispersion stability and thus printability. Such additional cationic salt partially replaces the phosphonium salt(s).

Abstract: A deposition material for an electrostatic deposition apparatus such as an ink for an electrostatic ink jet printer, the material comprising a carrier liquid having insulative properties, a charging agent which is soluble in the carrier liquid, and a charge augmenting additive which is soluble in the carrier liquid. The charge augmenting additives are carrier soluble materials that assist in the dissociation of the charging agent. Generally it is found that they are materials which contain nitrogen groups, e.g. amine functionality.

Abstract: A colored photosensitive composition is composed of a pigment composition, a binder polymer having an acidic group, a multi-functional monomer having at least two ethylenic unsaturated double bonds, and a photopolymerization initiator. The pigment composition is composed of an organic pigment, a dispersant, and an organic solvent. The dispersant is a copolymer of a polymerizable oligomer having an ethylenic unsaturated double bond in its terminal position and one or more monomers at least one of which has a nitrogen-containing group and an ethylenic unsaturated double bond.

Abstract: A liquid composition according to the present invention includes an organic solvent having a vapor pressure of 30 to 60 mmHg at 20° C. and water, wherein a weight ratio of the organic solvent and the water is between 95:5 to 45:55. The invention further provides an ink set which comprises the liquid composition and an ink, and an image forming method which employ the liquid composition and the ink.

Abstract: In accordance with the invention inks suitable for use in ink-jet printers and method for formulating the same are provided. More particularly, inks comprising the present dyes and buffers exhibit excellent color performance and lightfastness across a range of media. Furthermore, the inks enable good reliability in an environment having a relatively high concentration of precipitating agents. This reliability enables the use of precipitation bleed control mechanisms.