A hot-melt ink for an ink jet printer is formed from a solid organic solvent having a melting point less than 150.degree. C. and a low molecular weight thermosetting resin having a high hydroxyl number, together with a dye. The ink has excellent jetting characteristics, forms a hard, stable print raised above the surface of the substrate, provides high dot resolution, and remains colorfast both in the ink jet printer and on the paper, even when exposed to continued high temperatures. It is non-toxic and odorless, and eminently suitable for office document preparation and other applications. In a preferred embodiment, the inks comprise color subtractive dyes, making them suitable for use in multi-color printing.
A method for recording on a recording medium by discharging a non-aqueous ink containing a non-aqueous solvent and a pigment by an inkjet system. The method contains a step of preparing recording paper having a thickness exceeding 0.083 mm as a recording medium, a step of obtaining a volume V.sub.m and a thickness T.sub.m of the recording paper, a step of obtaining a volume V.sub.s of a solvent that is capable of being retained by the recording paper by using a solvent having a vapor pressure at 25.degree. C. of 0.001 mmHg or less and a specific gravity of from 0.800 to 1.200, a step of obtaining a solvent absorptivity A.sub.sl. (%) of the recording paper by the following equation (1): A.sub.sl.=(V.sub.s/V.sub.m).times.100 (1) a step of obtaining an allowable ink amount V.sub.I (pl/m.sup.2) per unit area of the recording paper by the following equation (2): V.sub.I=(T.sub.m-0.083).times.A.sub.sl..times.10.sup.12 (2) and a step of discharging the non-aqueous ink in an amount V.sub.d (pl/m.sup.2) satisfying the following equation (3) by an inkjet system: V.sub.d.ltoreq.V.sub.I. (3)
A hot-melt ink composition for an ink jet printer, comprising a coloring agent, and a vehicle which comprises a dialkylbenzenesulfonamide, a monoalkylbenzenesulfonamide, and a resin; and a hot-melt ink composition comprising from 10 to 30 wt. % of a coloring agent, and a vehicle. These ink compositions can produce high quality images which have improved resistance to abrasion and are free from blooming.
A hot melt ink comprising, a eutectic composition and an image-forming agent, wherein the melting point of the eutectic composition is from about 80.degree. C. to about 130.degree. C. and the compounds present in the eutectic compositions have melting points of at least about 100.degree. C. Also disclosed is a method for ink jet printing comprising: (a) providing a thermally reversible hot melt ink which is a solid at ambient temperature and a liquid at temperatures between about 80.degree. C.-130.degree. C., said ink comprising: (i) a eutectic composition; and (ii) an image-forming composition; (b) elevating the temperature of said eutectic composition to between about 90.degree. C. and about 140.degree. C., to cause said ink to form a liquid solution or suspension of said image-forming composition; (c) jetting said ink onto a substrate in the form of images; (d) allowing said ink to crystallize upon cooling on said substrate.
In a hot-melt type ink-jet recording ink composition comprising a resin, a wax and a colorant, the resin comprises an amide resin and a hydrocarbon resin, and the wax is capable of making the amide resin and the hydrocarbon resin compatible.
A solid ink jet ink composition which is suitable for hot melt applications having a carrier having an electrical resistivity of at least 10.sup.8 Ohm.cm, insoluble marking particles and a particle charging agent dispersed in it. The marking particle may be a pigment, an insoluble dyestuff, a polymer or mixture thereof. The particle charging agent may be a metal soap, a fatty acid, lecithin, an organic phosphorous compound, a succinimide, a sulphosuccinate, petroleum sulphonates, a soluble or partially soluble resin such as a modified rosin ester, an acrylic, a vinyl a hydrocarbon or a mixture thereof. The solid ink jet ink composition may further include a viscosity controller. The ink may be capable of being heated to 155.degree. C. and have at that temperature a viscosity of between 5 to 150 cps.
