Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2000-02-22
2001-11-27
Koslow, C. Melissa (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Marking
C106S031750, C106S031280, C106S031860, C106S031580
Reexamination Certificate
active
06322619
ABSTRACT:
A number of the components of the above copending application and patents, such as the colorants, ink additives, and the like may be selected for the inks of the present invention in embodiments thereof.
BACKGROUND OF THE INVENTION
The present invention is directed to ink compositions and, more specifically, the present invention relates to aqueous inks formulated with a mixture of colorants and preferably wherein the inks contain a poly(diallyl dialkyl ammonium) halide, such as poly(diallyl dimethyl ammonium)chloride, and which inks are especially useful for acoustic ink printing, processes and apparatuses, reference for example U.S. Pat. No. 5,121,141, U.S. Pat. No. 5,111,220, U.S. Pat. No. 5,128,726, and U.S. Pat. No. 5,371,531, the disclosures of which are totally incorporated herein by reference, including especially aqueous ink acoustic ink processes as illustrated in copending application U.S. Ser. No. 09/510,552, the disclosure being totally incorporated herein by reference.
There can be generated with such inks excellent developed images on plain and coated papers with acceptable image permanence, excellent projection efficiency on transparencies without a post fusing step, and excellent crease resistance, and wherein the inks possess acceptable, and in embodiments superior lightfastness, and superior waterfastness.
PRIOR ART
Known are ink compositions comprised of water, a colorant, and a monomeric oxazolidinone compound; an ink composition comprised of an aqueous liquid vehicle, a pigment, and a vesicle-forming lipid, wherein vesicles of the lipid are present in the ink; an ink composition comprised of water, a colorant, a nonionic surfactant, and a fluorinated component; and a thermal ink jet printing which comprises incorporating into a thermal ink jet printer an ink composition comprising water; a colorant of a dye or pigment; a hydroxyamide derivative having at least one hydroxyl group and at least one amide group or a reaction product of oxyalkylene(s) and a sulfur-containing humectant that is a sulfoxide or a sulfone or a thiol derivative.
U.S. Pat. No. 4,751,528, the disclosure of which is totally incorporated herein by reference, discloses a semi-solid hot melt ink jet system which includes a temperature-controlled platen provided with a heater and a thermoelectric cooler electrically connected to a heat pump and a temperature control unit for controlling the operation of the heater and the heat pump to maintain the platen temperature at a desired level.
Further, U.S. Pat. No. 4,791,439, the disclosure of which is totally incorporated by reference, discloses an apparatus for use with semi-solid hot melt inks having an integrally connected ink jet head and reservoir system.
Ink compositions for ink jet printing are known. For example, U.S. Pat. No. 4,840,674, the disclosure of which is totally incorporated herein by reference, discloses an ink composition which comprises a major amount of water, an organic solvent selected from the group consisting of tetramethylene sulfone, 1,1,3,3-tetramethyl urea, 3-methyl sulfolane, and 1,3-dimethyl-2-imidazolidone, which solvent has permanently dissolved therein spirit soluble dyes.
U.S. Pat. No. 5,006,170 and U.S. Pat. No. 5,122,187, the disclosures of each of which are totally incorporated herein by reference, disclose semi-solid hot melt ink compositions suitable for ink jet printing which comprise a colorant, a binder, and a propellant such as hydrazine, cyclic amines, ureas, carboxylic acids, sulfonic acids, aldehydes, ketones, hydrocarbons, esters, phenols, amides, imides, halocarbons, and the like. The inks of the present invention are dissimilar than the aforementioned '179 and '187 in that, for example, the invention vehicle selected displays an important acoustic loss value and a viscosity of from about 1 to about 20, and preferably about 10 centipoise when heated to a temperature of from about 125° C. to about 165° C., such that acoustic energy in the printhead can eject an ink droplet onto paper.
U.S. Pat. No. 5,041,161, the disclosure of which is totally incorporated herein by reference, discloses an ink jet ink which is semi-solid at room temperature.
U.S. Pat. No. 4,853,036 and U.S. Pat. No. 5,124,718 disclose an ink for ink jet recording which comprises a liquid composition essentially comprising colorant, a volatile solvent with a vapor pressure of 1 millimeter Hg or more at 25° C., and a component that is solid at room temperature and having a molecular weight of 300 or more.
In U.S. Pat. No. 5,688,312 there are disclosed inks with a number of colorants, and which inks may be selected for acoustic ink printing.
SUMMARY OF THE INVENTION
While the known ink compositions and processes may be suitable for their intended purposes, a need remains for acoustic aqueous ink compositions suitable for ink jet printing. In addition, there is a need for aqueous ink compositions which are compatible with a wide variety of plain papers and generate photographic quality images on coated papers without the use of carbon black pigments or high cost specialty black colorants, said colorants often having lower solubility in ink vehicles containing waterfastness additives such as those used in the present invention. Further, there is a need for aqueous ink compositions which generate high quality, lightfast, and excellent waterfast images on plain papers and on many commercial thermal ink jet photopapers. There is also a need for aqueous ink jet ink compositions which generate high quality, fast-drying images on a wide variety of plain papers at low cost with high quality text and high quality graphics, and wherein the colorant, such as the dye, is retained on the paper surface while the ink vehicle can continue to spread within the paper structure. Further, there is a need for aqueous ink jet ink compositions which exhibit minimal feathering. Additionally, there is a need for aqueous ink jet ink compositions which exhibit minimal intercolor bleed. There is also a need for aqueous ink jet ink compositions which exhibit excellent image permanence. Further, there is a need for aqueous ink jet ink compositions which are suitable for use in acoustic ink jet printing processes. Additionally, there is a need for aqueous ink compositions suitable for ink jet printing processes wherein the substrate is heated prior to printing and is cooled to ambient temperature subsequent to printing (delay printing processes). There is also a need for ink compositions suitable for ink jet printing wherein high optical densities can be achieved with relatively low dye concentrations. A need also remains for ink compositions suitable for ink jet printing wherein curling of the substrate, such as paper, subsequent to printing is minimized, or avoided. These and other needs can be achievable with the inks of the present invention in embodiments thereof.
SUMMARY OF THE INVENTION
Examples of features of the present invention include, for example:
It is a feature of the present invention to provide aqueous ink compositions with many of the advantages illustrated herein.
It is another feature of the present invention to provide process black aqueous ink compositions suitable for acoustic ink jet printing.
It is yet another feature of the present invention to provide aqueous ink compositions which are compatible with a wide variety of plain papers and yield photographic quality images on coated papers.
It is still another feature of the present invention to provide aqueous ink compositions which generate high quality images on plain papers and ink jet photopapers, and wherein there is selected a mixture of dyes, or wherein the ink vehicle contains a waterfastness additive and a salt.
Another feature of the present invention is to provide aqueous ink jet ink compositions comprised of a mixture of dyes, and wherein in embodiments the inks possess a low viscosity of, for example, from about 1 to about 10 at the jetting temperature.
Yet another feature of the present invention is to provide aqueous ink jet ink compositions which exhibit low viscos
Breton Marcel P.
Lesani Fereshteh
Mayo James D.
Faison Veronica F.
Koslow C. Melissa
Palazzo E. D.
Xerox Corporation
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