Abstract: An ink set comprising: at least two kinds of inks, each of the at least two kinds of inks having a common hue and different densities, and containing an aqueous medium and a dye, wherein each of the at least two kinds of inks has a corresponding discoloration velocity constant (k) for an image printed with each one of the at least two kinds of inks, and a ratio defined by a minimum value (kmin) selected from among said corresponding constants divided by a maximum value (kmax) selected from among the corresponding constants, is within a range of 0.7 to 1.0.

Abstract: The present invention is drawn to a pigment-free ink-jet ink and method of producing a printed image. The ink-jet ink can comprise an aqueous liquid vehicle including 1-(2-hydroxyethyl)-2-pyrrolidinone, and a colorant consisting essentially of a dye that is solubilized in the aqueous liquid vehicle.

Abstract: Provided is a water-based ink composition for a writing instrument comprising at least a colorant and water, wherein a nonionic high molecular surfactant having an alkylene oxide chain as a hydrophilic group and having an average molecular weight of 3000 to 200,000 is added to the ink composition in a range of 0.1 to 30% by weight. The above nonionic high molecular surfactant has preferably an HLB of 8 or more or a cloud point of 50° C. or higher and includes N-polyoxyalkylene-polyalkylenepolyamine and a polyoxyethylene-polyoxypropylene block polymer.

Abstract: An ink for ink-jet recording containing: a colorant; and a set of solvent A and solvent B, provided that solvent B has a larger vapor pressure than solvent A, wherein the set of solvent A and solvent B has a maximum in viscosity by changing a mixing ratio of solvent A to solvent B; and a content of solvent A in weight (A(wt)) and a content of solvent B in weight (B(wt)) in the ink satisfy the following relationship: 50?[A(wt)/(A(wt)+B(wt))]×100?95.

Abstract: A fluorescent water base ink for ink-jet recording contains a fluorescent dye having a xanthene skeleton, and a glycol. In the fluorescent dye, the difference in hydrophilic index log P is not less than 2.6 between a substituent bonded to C-9 carbon atom of the xanthene skeleton and other portion of the fluorescent dye than the substituent bonded to the C-9 carbon atom. The glycol has a distance between hydroxyl groups substantially equivalent to or longer than an interatomic distance between atoms directly bonded to C-3 and C-6 carbon atoms of the xanthene skeleton of the fluorescent dye, respectively. It is assumed that the glycol is coordinated with the xanthene skeleton in a bridge form to increase the fluorescence intensity by increasing the electron density of the xanthene skeleton. The ink having high fluorescence intensity and in which the fluorescence intensity is not lowered in a time-dependent manner is provided.

Abstract: The instant invention pertains to an inkjet ink composition comprising a soluble colorant and a vehicle, wherein the vehicle comprises an aqueous continuous phase and a microemulsified oil phase. The invention also pertains to an ink set containing this inkjet ink, as well as methods of printing using the inkjet ink and/or ink set.

Abstract: The invention provides for thickeners for inks and coating materials, comprising polyurethanes, water, viscosity regulators, and, if desired, organic solvents, wherein said viscosity regulators comprise compounds of the general formula (I) R1—O—(SO)a—(EO)b—(PO)c—(BO)d-(DTO)e—R2 in which R1 and R2 independently of one another are one of the radicals from the group consisting of hydrogen, an aliphatic or cycloaliphatic hydrocarbon radical which optionally is substituted and/or contains multiple bonds and/or contains heteroatoms, an aromatic radical which optionally is substituted and/or contains heteroatoms, an acyl radical, a carboxyacyl radical, and a carboxyalkyl radical, a=1 to 5, b=3 to 30, c=0 to 5, d=0 to 5, and e=0 to 5 where (a+c+d+e)<=b.

Abstract: A ballpoint ink composition capable of preventing a blobbing phenomenon by controlling the volatility of the ink solvent to prevent extreme drying on the ball surface and control the internal cohesion of the ink is provided, which is an oil-based ballpoint ink composition comprising, as the main solvent, a solvent represented by the following chemical structural formula and further containing at least one or more surfactant selected from the group consisting of a polyoxyethylene alkyl ether, a fatty acid polyoxyethylene alkyl ether, a polyethylene glycol fatty acid ester, a polyoxyethylene glycerin fatty acid ester and a polyoxyethylene sorbitan fatty acid ester: (wherein R1, R2 and R3 each is independently H or CH3).

Abstract: A peelable stenciling ink for imprinting indicia such as letters, numbers and symbols on a surface of an article such as a sport ball made of leather or a synthetic polymer, e.g., a thermoplastic material, consists of a solvent, a dye dispersed in the solvent, and a film-forming polymer soluble in the dye-solvent solution to form a thick paste and hardenable into a solid, flexible film upon evaporation of the solvent from a thin layer of ink applied to an article surface.

Abstract: An ink set for reducing intercolor bleed and a multi-colored ink jet printing process utilizing the same is provided. The ink set comprises a black ink composition and a plurality of color ink jet ink compositions comprising a colorant and an ink vehicle. The ink vehicle of at least one of the color inks matches the ink vehicle of the black ink. An ink set may also be a hybrid ink set comprising a black/color ink subset that includes a black ink composition and at least one color ink composition, and a color/color ink subset that includes a plurality of color ink compositions, wherein the ink vehicle of the color ink composition(s) in the black/color ink subset matches the ink vehicle of the black ink composition and the ink vehicles of at least one of the color inks in the color/color subsets match the ink vehicle of another color ink in the color/color ink subset.

Abstract: A water base ink for ink-jet recording contains 0.1% by weight to 4.0% by weight of C.I. Direct Yellow 132; not less than 0.5% by weight of glycol ether having a melting point of not more than ?45°C.; and a water-soluble organic solvent in which a solubility of C.I. Direct Yellow 132 at 20° C. is not less than 5%. The ink satisfies 0.2?B/A and 3?C/A. B/A represents a weight ratio of the glycol ether to the C.I. Direct Yellow 132 contained in the ink, and C/A represents a weight ratio of the water-soluble organic solvent to the C.I. Direct Yellow 132 contained in the ink. The stability in long-term storage after the evaporation of water or at low temperatures can be obtained even when C.I. Direct Yellow 132 is used in the water-base ink for the ink-jet recording.

Abstract: An ink, wherein the ink includes a jettable vehicle, and a colorant configured to fluoresce in a visible light range when exposed to an ultraviolet (UV) light, wherein the ink is edible, and wherein the ink is invisible when viewed under white light conditions.

Abstract: A benzophenone compound, and an ink composition that includes the benzophenone compound can absorb UV light, and thus improve lightfastness of images produced with the ink composition containing the compound. Due to the function of the benzophenone compound as a lightfast dispersant, the dispersibility and the lightfastness of an ink composition are improved with the benzophenone compound, without requiring an additional lightfastness enhancer.

Abstract: Improved combination eradicable ball-pen and re-write inks are disclosed. The combination eradicable and re-write ball-pen inks disclosed include water, glycerol, one or more acids and an eradicable dye. Glycerol is present in an amount greater than the water content, which is relatively low and the eradicable dye is provided in substantial amounts so that the glycerol and eradicable dye provide the requisite viscosity for a ball-pen ink. The combination of the high dye content and acid content also enables the eradicable ball-pen ink to be used as the re-write ink.

Abstract: This invention relates to a water-based ink for ink-jet thermal printing containing a surface-active agent having, at a certain concentration, a slow dynamic rearrangement. This surfactant system gives the ink a high surface tension under dynamic conditions which grants greater droplet ejection frequencies with respect to the inks usually employed. At the same time, the ink's low static surface tension value means that it has correct paper wettability properties.

Abstract: An oil based ink composition for ink jet recording containing, as an organic solvent, a mixture of a diethylene glycol compound that is liquid at ordinary temperature under atmospheric pressure and a dipropylene glycol compound that is liquid at ordinary temperature under atmospheric pressure at a diethylene glycol compound to dipropylene glycol compound weight ratio of 20:80 to 80:20, and an ink jet recording method using the oil based ink composition are disclosed. The oil based ink composition for ink jet recording provides high quality images with high gloss, excellent abrasion resistance and water resistance, and freedom from blur or bleeding.

Abstract: The present invention is drawn to multimeric dyes, ink-jet inks, and systems that can be used to print images having good water fastness and humid fastness, as well as good color characteristics. Specifically, a multimeric dye for ink-jet printing can comprise a first dye molecule chemically coupled to a second dye molecule through a linker group, wherein the multimeric dye is stable in the presence of interfering metals. These multimeric dyes can be used to form ink-jet inks and can be used in printing systems in accordance with embodiments of the present invention.

Abstract: An ink for inkjet recording containing a vehicle, coloring agents dispersed therein, and a dispersing agent for the coloring agents as required, is provided. The vehicle contains at least a first solvent component and a second solvent component. The first solvent component has the lowest boiling point among the components in the ink, and has a higher viscosity than the ink. The second solvent component has a higher boiling point than the first one. The boiling point of the first solvent component is preferably 280 degree C. or below, and the content thereof is preferably 10 to 80% by weight based on the total weight of the ink. Even when the ink is printed on non-coated papers, the vehicle penetrates little in the thickness direction and bleeds little in the horizontal direction. Clogging in the nozzles can be prevented effectively using the ink even when it has been left in an open atmosphere for a long time.

Abstract: A fluorescent water base ink for ink-jet recording to be used for an ink-jet printer contains water, a pigment, a compound having primary or secondary amide group, and a fluorescent dye represented by the following formula (1): wherein R1 represents OH or N(R3)R4, R2 represents hydrogen atom or halogen atom, and each of R3 and R4 represents hydrogen atom or alkyl group. A sufficient OD value and a fluorescence value are obtained while securing the vivid color development and the excellent water resistance principally in accordance with the interaction of the fluorescent dye and the compound having the amide group.

Abstract: An ink composition is provided which is suitable for use in an ink jet printer and comprises solvent, colourant and binder, wherein the solvent comprises methyl acetate. The composition is particularly suitable for printing on polymeric substrates, eg polypropylenes and polyethylenes.

Abstract: The present invention aims to provide an ink jet black ink which can improve weatherability, optical density and sticking recovery property of nozzles of a recording head. According to the present invention, an ink jet black ink is provided which comprises at least a coloring-material and a water-soluble organic solvent, wherein the coloring material is a compound represented by the following general formula (I) or a salt thereof, and the water-soluble organic solvent is a water-soluble organic solvent having a relative permittivity of from 30.0 or more to less than 70.0 at 20° C. and capable of dissolving the compound represented by the following general formula (I) or a salt thereof, by 1.0 mass % or more at 25° C., and is in a content of 50.

Abstract: The present invention is relative with a water color ink suited for ink jet printing for plain paper. The dry viscosity, the dynamic surface tension at 10 ms and the dynamic surface tension at 1000 ms of the ink are prescribed to be equal to 100 mPa·s or less, equal to 45 mN/m or higher and equal to 35 mN/m or less to provide for reduced bleeding and superior drying performance and emission reliability.

Abstract: A lightfast additive and an ink composition including the same include a benzophenone moiety for lightfastness and a moiety for wettability and the ability to stabilize a colorant, wherein the two moieties are covalently bonded. The lightfast additive may exhibit effective ultraviolet (UV) light absorption capacity, effective wettability, and an ability to stabilize a colorant. The ink composition utilizing the light fast additive thus has an improved lightfastness and long-term storage stability.

Abstract: An oil-based ink composition for ink jet recording of the present invention contains a colorant and at least 50% by weight of a mixed solvent made by mixing from 0.02 to 4 parts by weight of a lactone-type solvent with 1 part by weight of polyoxyethylene glycol dialkyl ether represented by the following general formula (1): R11—(OC2H4)n—OR12??General Formula (1) (wherein R11, R12 represent alkyl groups having from 1 to 3 carbon atoms and can be the same or different, and n is an integer from 2 to 4). The oil-based ink composition can be suitably used for printing on a polyvinyl chloride substrate and is excellent in all of print quality, printing stability, dry characteristics of printed matter, and storage stability of ink.

Abstract: A non-aqueous ink jet ink for printing lithographic printing plates. The formulation provides for ink jet printing using a solvent based ink in a drop on demand printer. The ink exhibits excellent physical properties and good stability over a range of times and temperatures.

Abstract: This invention relates to a yellow ink composition for ink jet printing comprising a dye represented by Formula I, water and a humectant: wherein: R1 and R5 independently are hydrogen or a substituted or unsubstituted alkyl, aromatic or heterocyclic group; R2 and R4 independently are hydrogen or a non-metallic substituent; R3 is hydrogen or a substituted or unsubstituted alkyl, acyl, sulfonyl, aromatic or heterocyclic group; and X is an electron withdrawing group; with the proviso at least one of R1, R2, R3, R4 and R5 comprises a group capable of imparting water solubility to the dye.

Abstract: The colored liquid composition of the invention for a highlighter comprises a coloring element and water, the water content by weight lies in the range 10% to 30%. In addition, it comprises at least 40% of a liquid component having surface tension greater than 40 mN/m. In a variant, the coloring element is a tracer solvent having a fluorescent appearance under basic pH, in particular hydroxypyrenetrisulfonic acid, the pH of the composition lying in the range 8 to 9, and the component having surface tension greater than 40 mN/m is triethanolamine. Under such circumstances, the composition contains an acid to neutralize the triethanolamine in part in order to obtain the basic pH, for example hydrochloric acid.

Abstract: An Ink-jet ink composition for piezoelectric in-jet printing comprising: (a) a hydrophobic dye; (b) an oil-in-water microemulsion including: (i) a volatile oil; (ii) water; (iii) a co-solvent; (iv) at least one surfactant; and (v) a binder, wherein upon application of the ink to a substrate surface, the volatile oil evaporates and nanoparticles are formed. The invention additionally discloses a printing process using the ink composition.

Abstract: In order to improve the water-resisting property of an image formed on a recording medium such as recording paper and plain paper by using an ink-jet recording ink, while also improving the light-resisting property of the image, an ink-jet recording ink, which contains a color material, water, a moisture-retaining agent, an organic silicon compound and an ultraviolet-ray absorbing agent, is allowed to contain an organic silicon compound in a range of 0.1 parts by weight to 50 parts by weight and an ultraviolet-ray absorbing agent in a range of 0.1 parts by weight to 10 parts by weight with respect to 100 parts by weight of the ink. The ultraviolet-ray absorbing agent is at least one compound selected from the group consisting of benzophenone-based, benzotriazole-based, cyanoacrylate-based and oxalic acid anilide-based compounds.

Abstract: A dye for ink-jet printing on both hydrophilic and hydrophobic papers. The dye includes a chromophore tonically coupled to a counterion. One of the chromophore and the counterion includes a hydrophilic moiety. The other includes a hydrophobic moiety.

Abstract: The present invention provides a black ink composition obtained by mixing at least one colorant selected from the group consisting of a compound represented by the following formula (1) and a salt thereof, one or more organic acids and one or more organic bases: wherein R1 represents a phenyl group having a substituent group or a naphthyl group having a substituent group, R2 represent a phenylene group having a substituent group or a naphthylene group having a substituent group, R3 represents a 5- to 7-membered heterocyclic ring having at least one double bond and substituent group, and further, the above-mentioned substituent groups in the above-mentioned R1 to R3 are each independently selected from the group consisting of OH, SO3H, PO3H2, CO2H, NO2, NH2, a C1–4 alkyl group, a C1–4 alkyl group having a substituent group, a C1–4 alkoxyl group, a C1–4 alkoxyl group having a substituent group, an amino group, an amino group having a substituent group and a phenyl group having a substituent group.

Abstract: An infrared dye, characterised in that the dye comprises two bridged diarylpolymethine type dyes or derivatives thereof connected together at either the 3, 4, 5 or 6 position by a central moiety such that the two dyes are located on each side of the central moiety, wherein the infrared dye absorbs strongly in the near infrared region of the spectrum but poorly in the visible region of the spectrum.

Abstract: The disclosure is generally related to a multi-color writing ink and, more particularly, to a multi-color writing instrument comprising a mixture of a first ink composition and a second ink composition, wherein the first and second ink compositions are immiscible with each other.

Abstract: An infrared dye, characterized in that the dye comprises of Formulae 1 to 5

Abstract: The present invention provides an ink composition comprising at least: water; a cyan dye; and an aromatic compound having a carboxyl group and/or a salt thereof. Also disclosed are an inkjet recording method using the ink composition, and recorded matter recorded using the ink composition or by the inkjet recording method.

Abstract: A highlightable ink including a colored pigment and an eradicable colorant; a kit including the highlightable ink and an eradicator solution; an ink complex including a colorless or substantially colorless eradicable dye selected from the group consisting of diarylmethane derivatives, triarylmethane derivatives, and methine dyes, and a colored pigment; and methods of applying an eradicator to at least a portion of a marking made with a highlightable ink, are disclosed herein.

Abstract: In accordance with embodiments of the present invention, an ink-jet ink can comprise a liquid vehicle including a halophenol and a metallized dye. Alternatively, a system for printing images with improved ozone fastness can comprise a printing medium including an ink-receiving layer coated thereon, wherein the ink-receiving layer includes semi-metal oxide or metal oxide particulates, and an ink-jet ink configured for printing on printing medium. The ink-jet ink can comprise a liquid vehicle including a protonated phenol devoid of water solubilizing moieties, and a metallized dye.

Abstract: An ink composition for continuous deflected jet printing that is liquid at room temperature and that contains: a binder; one or more dyes and/or pigments; and a solvent; wherein the said solvent contains more than 70% by weight—relative to the total weight of the ink—of propylene carbonate, and less than 10% by weight, preferably less than 5%, more preferably less than 1% and best 0% by weight of water.

Abstract: An inkjet ink set comprising at least two inks, wherein at least one ink contains a betaine compound and at least one other ink contains a nonionic surfactant.

Abstract: The invention relates to an ink composition comprising solubilized yellow dyes for inks with improved ozone and light stability.

Abstract: An ink jet set comprising: a) a cyan ink comprising a carrier and a sulfonated copper phthalocyanine dye; b) a magenta ink comprising a carrier and an anthrapyridone magenta dye or metal complex magenta dye, or azo-naphthol derivative magenta dye or mixture thereof; c) a yellow ink comprising a carrier and an azo-aniline yellow dye or metal complex yellow dye or mixtures thereof; and d) a trisazo black dye of the following structure where Met is a metal atom, preferably Al, Co, Cr, Cu, Fe, or Ni; R1 is a phenyl or naphthalene radical substituted by 1, 2 or 3 substituents selected from the group consisting of OH, O(C1–C6)-alkyl, COOM, SO3M and NH2; R2 is C1–C6-alkyl, n is 0 or 1, X is a chemical bond or —CO— or —SO2—; R3 is H, methyl or O(C1–C6)-alkyl; R4 and R5 are each H, COOM or SO3M; R6 is a phenyl, pyridyl or pyrazole radical substituted by 1,2 or 3 substituents selected from the group consisting of OH, O(C1–C6)-alkyl, COOM, SO3M, NH2, NHaryl, NHacyl and phenylsulfo; and M is ammonium, H, K, Li, or Na

Abstract: To provide a non-aqueous ink composition which is small in generation of strike through or smear marks and free from the problem of clogging of the nozzle. A non-aqueous ink composition includes solvent, dispersant and coloring material of pigment or dye. The solvent contains therein at least not smaller than 10% by weight non-polar organic solvent which is not higher than 260° C. in 50% running point and at least not smaller than 20% by weight polar organic solvent which is not lower than 300° C. in 50% running point.

Abstract: This invention relates to an ink composition comprising a dye represented by Formula I: wherein R1 is independently a non-metallic substituent; s is 0, 1, 2, 3, or 4; R2 is hydrogen or a non-metallic substituent; R3 is a substituted or unsubstituted aromatic or heterocyclic group with the proviso that if R3 is a quinoline moiety, the azo group is not bonded to the 5, 6, 7 or 8 position of the quinoline ring; wherein the dye must bear at least one ionizable group that is capable of imparting water solubility to the dye. It also relates to dyes which comprise a specific subset of the above dyes.

Abstract: A photocurable ink for ink-jet recording, comprising an oxetane compound having a substituent at the 2-position of the molecule.

Abstract: The present invention is drawn to an ink-jet ink, comprising an aqueous ink vehicle including effective amounts 2-methyl-1,3-propanediol and derivatized 2-pyrrolidinone, and a dye solubilized in the ink-vehicle. A method of ink-jetting ink with acceptable decap, recovery, and color attributes is also provided that can comprise jetting an ink-jet ink from an ink-jet pen, wherein the ink-jet ink includes an ink vehicle including effective amounts 2-methyl-1,3-propanediol and derivatized 2-pyrrolidinone, and a dye solubilized in the ink-vehicle.

Abstract: There is provided a water-based ink that gives good coloration and little blurring on regular paper, gives adequate coloration on specialist paper, and has good fixability, and further gives excellent discharge stability with ink jet recording, and moreover exhibits the effect of a chelating agent even in a small amount, and is not harmful due to evaporating, subliming or the like.

Abstract: Anti-bronzing compounds are added to inkjet inks to prevent bronzing of the inks when printed on specialty quick-dry inkjet photographic media. These compounds inhibit bronzing by the proper buffering of the dyes relative to the media of interest.

Abstract: Ink for inkjet recording comprises a dye, water, a water-miscible organic solvent and a precursor of acids, and thereby is rendered resistant to image blur even under a high humidity condition, an ink set including such ink, and an inkjet recording method, in which such ink or such an ink set is used.

Abstract: An ink containing a water, a water-soluble organic solvent, a dye, and a betaine compound, which optionally further contains a nonionic surfactant or at least one another betaine compound.

Abstract: An infrared dye, characterized in that the dye comprises a compound that can be described by molecule 1.