Abstract: An ink recording method is disclosed, which comprises printing a recording paper with an aqueous ink and immediately thereafter applying pressure onto the recording paper, whereby sharp images can be printed at high speed even on a plain paper.

Abstract: Disclosed is an ink holding material to be put in an ink tank of an ink jet recording device, which is such that when it is extracted with pure water, the electrical conductivities and the surface tensions of the water before and after the extraction satisfy relationship (1):350 .gtoreq..gamma.r/.sigma.r-.gamma.s/.sigma.s.gtoreq.0 (1)wherein .gamma.r represents the surface tension (mN/m) of pure water before extraction; .sigma.r represents the electrical conductivity (mS/m) of pure water before extraction; .gamma.s represents the surface tension (mN/m) of pure water after extraction; and .sigma.s represents the electrical conductivity (mS/m) of pure water after extraction.

Abstract: An ink jet recording ink comprising water, a coloring material, a water-soluble organic solvent and a plurality of dispersants each having a different HLB, and an ink jet recording method using this ink jet recording ink are disclosed. Preferably, given that respective HLBs of n (n.gtoreq.2) kinds of dispersants are such that HLB.sub.1 <HLB.sub.2 < . . . <HLB.sub.n, at least two dispersants satisfy the following formula:1.ltoreq.HLB.sub.x -HLB.sub.x-1 .ltoreq.30(wherein, X is an integer from 2 to n). The ink jet recording ink and ink jet recording method of the present invention do not clog a nozzle, have an excellent dispersion stability, discharge responsiveness and discharge stability, and provide uniform images having high resolution and high optical density stably.

Abstract: An ink jet recording ink including water, a water-soluble organic solvent, and at least one dye having at least one carboxyl group in the form of a free acid, wherein at least one compound selected form secondary or tertiary amine compounds represented by the following general formula (I) and at least one compound selected from the alkali metal hydroxides are contained and the pH value thereof is from 8.5 to 12: ##STR1## wherein one or two of R.sup.1, R.sup.2, and R.sup.3 are an alkyl group having 1 to 5 carbon atoms in the alkyl chain and substituted by a substituent selected from a carboxyl group, a sulfonic group, an alkali metal salt of a carboxyl group, and an alkali metal salt of a sulfonic group; and the remainder is a group selected from a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, and a substituted alkyl group having 1 to 5 carbon atoms in the alkyl chain and substituted by a hydroxyl group or carbamoyl group is disclosed.

Abstract: A multicolor ink set includes a black ink including at least a water-insoluble coloring material in which a carboxylic acid structure or a carboxylate salt structure is exposed to the surface, water, and a water-soluble organic solvent, and having a surface tension at 20.degree. C. of from 30 to 60 mN/m, and a color ink including at least one or more water-soluble coloring material selected from cyan, magenta and yellow, water, and a water-soluble organic solvent, having a surface tension at 20.degree. C. of from 20 to 50 mN/m and lower than that of the black ink, and 50% by weight or more of the water-soluble coloring material has a solubility in water at 20.degree. C. of 10% by weight or less.

Abstract: An ink jet recording ink comprising: (i) water, (ii) a water-soluble organic solvent, (iii) at least one dye having at least one carboxyl group in the form of a free acid, (iv) a substituted aromatic compound represented by general formula (I); and (v) at least one alkali metal hydroxide, wherein the pH value of the ink is from 8 to 12, and an ink jet recording method in which such ink droplets are discharged from an orifice according to a recording signal to record an image using this ink jet recording ink are disclosed, general formula (I) being: ##STR1##

Abstract: Disclosed is a color ink set for ink-jet recording, which color ink set comprises a set of single-color ink, namely, cyan ink, magenta ink, yellow ink and black ink, each single-color ink containing at least a colorant, a water-soluble organic solvent and water, wherein the colorant in the single-color ink has a specific chemical structure, and which color ink set for ink-jet recording fulfills the characteristics required for ink-jet recording ink, along with the details of single-color ink constituting the ink set and an ink-jet recording method using the color ink set.

Abstract: An ink jet recording ink comprising water, a coloring material such as carbon black, (a) a dispersant containing at least one of a sulfonic acid group, sulfuric ester, and salt thereof, such as a polystyrenesulfonate polymer, and (b) a dispersant above-mentioned dispersants is preferably from 0.1 to 20 parts by weight based on 10 parts by weight of the coloring material. Further, the pH, surface tension, and viscosity of the ink are preferably from 7.0 to 10.0, from 30 to 65 mN/m, and from 1.0 to 10.0 mPa.multidot.s, respectively. Dispersion stability for a long period of time is improved, kogation in the thermal ink jet method is prevented, and excellent fixation on paper is obtained containing a carboxyl group or salt thereof, such as a styrene-maleate polymer, wherein the ratio by weight of (a) to (b) is from 1:5 to 1:100.

Abstract: The present invention provides an ink which provides an image with a sufficient image density free from bleeding and unevenness, dries rapidly on paper and can be jetted at a high reliability and a recording method using said ink. A novel ink for ink jet recording comprising water, a coloring material and a water-soluble organic solvent is provided, characterized in that said ink comprises a polymer containing a carboxyl group having an average molecular weight of from 1,000 to 20,000 in the free or salt state in an amount of from 0.1 to 3% by weight, a water-soluble organic compound which normally stays solid and vaporizes in a proportion of not less than 50% by weight at a temperature of from 100.degree. C. to 350.degree. C. in an amount of from 1 to 20% by weight, and a compound represented by the following formula (A):R--O--X.sub.n H (A)wherein R represents a functional group selected from the group consisting of C.sub.

Abstract: Ink-jet recording ink and an ink-jet recording method, said ink-jet recording ink comprising a water-insoluble coloring material, water, and at least one compound selected from the group consisting of a compound represented by formula (I) and polyglycerin: ##STR1## wherein R represents H or an alkyl group having 1 to 5 carbon atoms; m, n, o and p are all integers; and m+n+o+p is 0 to 200.

Abstract: A plasma display panel for plasma display system provides excellent optical characteristics, including a color purity, contrast, and luminance, of a plasma display system. Barrier ribs forming a cell has wavelength-selective reflective filters for reflecting only a light of wavelength needed for display and absorbing the other lights coated thereon. The wavelength-selective reflective filters have phosphors coated thereon. A color filter is inserted between a first front panel and second front glass panel for feeding out the light in a sandwich state.

Abstract: The present invention provides an ink unit for use in an ink jet recording which can provide color images with high water resistance, no print bleeding, and an excellent color reproduction of shades, together with rub resistance, and also can render color images on ordinary paper clearly and stably, and an ink jet recording method using the ink unit, wherein the ink, unit which has a black ink and a color ink, comprises pigments, a polymeric dispersant, and water, wherein a black ink contains a black pigment and a first polymeric dispersant including a COOH group or the salt thereof (acrylic acid salts, methacrylic acid salts, and the like) and a color ink contains a chromatic pigment and a second polymeric dispersant including a SO.sub.3 H group or the salt thereof (vinyl sulfonic acid salts, naphthalene sulfonic acid salts, and styrenesulfonic acid salts).

Abstract: Ink for ink jet recording containing water, a coloring material and a water-soluble organic solvent, containing 0.01 to 5 wt % of a polymer containing a carboxylic group or polymer having salt of a carboxylic group, having an acid value of 50 to 700; and 0.001 to 5 wt % of a surface active agent, wherein the foaming surface viscosity of the ink is 0.05 to 1.0 g/s. The polymer is a copolymer of hydrophobic .alpha., .beta.- unsaturated ethylene monomer and a monomer having a plurality of hydrophilic --COOM groups (wherein M is hydrogen, alkali metal, or an onium compound including ammonium ion, organic ammonium ion, phosphonium ion, sulfonium ion, oxonium ion, stibonium ion, stanonium and iodonium), a monomer having acid anhydride thereof or a monomer containing ester thereof. The ink for ink jet recording and the ink jet recording method according to the present invention provide an image having a high optical density, without unevenness and free from feathering and bleeding.

Abstract: Ink-jet recording ink improved in releasability of bubbles and the like. The ink comprises water, a colorant and a water-soluble organic solvent. The surface tension of the ink at 20.degree. C. is higher than the surface tension of a composition which comprises the components for the ink except the colorant. Ink-jet recording is effected by making use of the ink and, for example, a heating system.

Abstract: An ink-jet recording head cleaning method and an ink-jet recording head cleaning cartridge for use in the method are disclosed. The cartridge 3 contains a cleaning liquid comprising water and a surfactant, and an ink cartridge is replaceable therewith. In cleaning a heating head 2 of an ink-jet recording apparatus having a removable ink cartridge, the ink cartridge is replaced with the head cleaning cartridge 3 to clean the head with the cleaning liquid contained in the head cleaning cartridge. The cartridge can be packed with a cleaning liquid holder comprising either a porous material or a nonwoven fabric made of chemical fibers. Tho head cleaning method is low-cost, does not impose any limitation on ink design, is free from the problem of printing density change which occurs during long-term use, and has an advantage that ink changes are easy.

Abstract: A gas discharge display panel which provides sufficient contrast and good accuracy and is high in yield. When a voltage is applied to auxiliary discharge electrodes, auxiliary discharge occurs in an auxiliary discharge space and excited charged particles communicate with a main discharge space through a priming path made in a discharge space separation bulkhead. In this state, when an alternating voltage is applied between bus electrodes on a front substrate, main discharge occurs in the main discharge space, causing Xe atoms in the sealed gas to generate ultraviolet rays, causing a phosphor to emit light. However, since the auxiliary discharge is shielded by a bulkhead and a barrier rib, the phosphor does not emit light when only auxiliary discharge occurs.

Abstract: A cathode ray tube has a panel portion 1 with a phosphor layer 5 formed on its inner face, a neck portion 2 accommodating an electron gun 9, a funnel portion 2 for coupling the panel portion 1 to the neck portion 2 and a color selective electrode assembly 6 having a number of electron beam passing openings arranged opposite to the phosphor layer 5 with a space therebetween. The color selective electrode assembly is installed within the panel portion 1. An electron beam reflection film of a bismuth oxide thin film 6R having a bulk density of from 4 to 9.3 g/cm.sup.3 is formed on the face of the color selective electrode assembly 6 against which the electron beams 14 emitted from the electron gun 9 collide. The cathode ray tube is capable of displaying high density and high resolution image.

Abstract: An ink for ink jet recording process, comprising water, a coloring material and a water-soluble organic solvent, wherein the ink further comprises a compound having a plurality of hydroxyl groups and at least one group selected from the group consisting of alkyl, haloalkyl, alkenyl, alkinyl, cycloalkyl and aromatic groups each having from 5 to 18 carbon atoms.

Abstract: A liquid developer for electrophotography is disclosed, which comprises a carrier, a charge director contained in the carrier, and toner particles dispersed in the carrier and having a volume-average particle diameter of from 0.5 .mu.m to 5 .mu.m, wherein the toner particles comprises a thermoplastic resin substantially insloluble in the carrier at a temperature used for development, a colorant dispersed in the resin, and a charge control agent. A process for producing the liquid developer, and a process for forming an image are also disclosed. Thereby, a liquid developer for electrophotography having good toner electrification characteristics and satisfactory charge stability is obtained.

Abstract: An ink for ink jet recording comprising water, a colorant and a water-soluble organic solvent, in which the water-soluble organic solvent comprises 2,2'-thiodiethanol having a purity of not less than 96% by weight and an electrical conductivity of from not less than 5.0.times.10.sup.-4 S/m to not more than 5.0.times.10.sup.-2 S/m as determined in the form of 10 wt % aqueous solution.