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388results about How to "High image density" patented technology

Reaction solution, set of reaction solution and ink, inkjet recording apparatus and image recording method

A reaction solution that is used for image recording with an ink containing a coloring material in a dissolved or dispersed state to destabilize the dissolved or dispersed state of the coloring material in the ink in contact with the ink to provide high quality and abrasion-resistant images, wherein the reaction solution contains at least a polyvalent metal ion and a nonionic polymer, the Ka value according to the Bristow method is from 1.3 mL·m−2·msec−1 / 2 to 3.0 mL·m−2·msec−1 / 2 inclusive, and the viscosity is from 20 mPa·s to 150 mPa·s inclusive.
Owner:CANON KK

Toner and method for producing the same, and image-forming method using the same

There are provided: a method for producing a toner containing to granulate a toner and to subjecting the granulated toner to at least washing with an alkali washing solution, in which the total organic carbon amount extractable from the alkali-washed toner is 200 ppm / g or less; a toner comprising polyester in which the total organic carbon amount extractable from the toner is 200 ppm / g or less, under the condition that the toner is subjected to washing with the alkali washing solution before extracting; and an image-forming method using such a toner.
Owner:RICOH KK

Ink for ink jet recording, ink set for ink jet recording, method for ink jet recording, ink cartridge for ink jet recording, ink jet recording apparatus and recorded article

An ink for ink jet recording and an ink jet recording method which realize an image quality of laser printer on a plain paper in a one-pass printing mode under conditions of a volume of an ink droplet ejected being 5 to 43 Pico liter, a velocity of an ink droplet being 6 to 20 m / sec, frequency of 1 kHz and resolution of 300 dpi or more. The ink for ink jet recording is a penetrating type ink which comprises (1) at least one humectant selected from glycerin, 1,3-butandiol, triethyleneglycol, 1,6-hexanediol, propyleneglycol, 1,5-pentanediol, diethyleneglycol, dipropyleneglycol, trimethylolpropane and trimethylolethane, (2) colorant contained in the amount of 6 % by weight or more, (3) a polyol having 8 to 11 carbon atoms and glycolether, and an anionic surfactants or non-ionic surfactants, the ink has viscosity of 5 mPa.s or more at 25° C. and a surface tension of 40 mN / m or less.
Owner:RICOH KK

Image forming method and image formed record

An image forming method of the present invention including applying a pretreatment liquid to a recording medium, and discharging an inkjet recording ink dropwise according to an image signal to form an image on the recording medium on which the pretreatment liquid has been applied, wherein the recording medium is regular paper which has no coat layer, the pretreatment liquid contains a cationic polymer compound, a surfactant A, water and a water-soluble organic acid, and the inkjet recording ink contains a water-dispersible colorant, a water-soluble organic solvent, a surfactant B, a penetrating agent and water, and wherein the pretreatment liquid has a static surface tension of 20 mN / m to 30 mN / m.
Owner:RICOH KK

Image recording method image recording apparatus and image recording acceleration liquid

An image recording method for forming an image on a recording material includes the steps of (a) applying to a recording material a colorless or light colored image recording acceleration liquid containing a compound which is capable of making insoluble a coloring agent contained in a recording liquid which comprises the coloring agent and a solvent for dispersing or dissolving the coloring agent, and (b) depositing the recording liquid imagewise on the recording material by ejecting the recording liquid in the form of droplets onto the recording material, the image recording acceleration liquid further containing at least one of surfactants represented by any of formulae (1) to (5) as specified in the specification, and an image formation apparatus for carrying out the above image formation method is provided.
Owner:RICOH KK

Recording Ink, Ink/Media Set, Ink Cartridge, Inkjet Recording Method and Inkjet Recording Apparatus

To provide a recording ink which contains at least a water-dispersible colorant, a water-dispersible resin, a wetting agent, a surfactant and water, wherein the content of the wetting agent in the recording ink is in the range of from 20% by mass to 35% by mass, the total solid content of the water-dispersible colorant and the water-dispersible resin in the recording ink is in the range of from 12% by mass to 40% by mass, the water-dispersible resin contains fluorine resin particulates, and the ratio A:B, where A is the solid content of the water-dispersible resin in the recording ink and B is the solid content of a pigment contained in the water-dispersible colorant in the recording ink, is in the range of 0.5 to 8.
Owner:RICOH KK

Magnetic carrier and two-component developer

A magnetic carrier composed of carrier particles is provided in which each carrier particle has a carrier core including magnetic fine particles and a binder resin with the carrier core surface being coated with a coat material containing a coat resin. In the magnetic carrier, Fatom / Catom and (Fatom / Catom) / (Fcalc / Ccalc) are respectively in specific ranges, wherein Fatom and Catom represent respectively a fluorine element abundance ratio and a carbon element abundance ratio at the magnetic carrier particle surface, and Fcalc and Ccalc represent respectively a fluorine element abundance ratio and a carbon element abundance ratio which are calculable from the molecular structure of the coat resin.In addition, a two-component developer is provoded including the magnetic carrier and a toner having a specific contact angle against water.
Owner:CANON KK

Ink set, ink-jet printing method, and ink-jet printer

The present invention provides an ink set which includes a combination of a recording liquid including a resin-coated colorant, and a treatment liquid including a particle which has a reactivity with the resin-coated colorant. The ink set can obtain a high quality image free from feathering and color bleeding, can obtain a high quality image even when used for printing on a plain paper sheet, can obtain a print excellent in wear resistance, can obtain a high image density without causing a deep permeation of a recording liquid in the paper sheet, can perform a favorable double-sided printing with a low image density when the image is viewed from an opposite face of an image print face, can be free from an image stain attributable to drying failure of the recording liquid, and can provide the print with a proper glossiness.
Owner:RICOH KK

Pigment Dispersion, Recording Ink, Ink Cartridge, Ink-Jet Recording Method and Ink-Jet Recording Apparatus

A pigment dispersion is provided that includes a pigment, a pigment dispersant, a polymer dispersion stabilizer and water, wherein the polymer dispersion stabilizer is an alpha-olefin / maleic anhydride copolymer expressed by the formula (1) below. A recording ink is also provided that includes the pigment dispersion, a surfactant, a water-dispersible resin, a humectant and water.In the structural formula (1), R represents an alkyl group and n is an integer of 30 to 100.
Owner:RICOH KK

Pretreatment liquid for recording material and image recording method using the pretreatment liquid

An image recording method including: applying a pretreatment liquid on a surface of a recording material; and discharging a recording ink according to image signals to form an ink image on the pretreatment liquid on the surface of the recording material before the pretreatment liquid applied to the recording material has dried, wherein the recording ink includes a solvent and a component dispersed or dissolved in the solvent, wherein the pretreatment liquid includes a compound depressing at least one of the dispersibility and solubility of the component in the recording ink in an amount of 10 to 80% by weight based on total weight, and wherein the pretreatment liquid has a viscosity of from 10 to 10,000 mPa·s at 25° C.
Owner:RICOH KK

Magnetic carrier, two-component developer and image forming method

A magnetic carrier constituting a two-component developer for use in an electrophotographic image forming method is formed of a carrier core comprising a first resin and magnetic fine particles dispersed in the first resin, and a second resin surface-coating the carrier core. (a) The magnetic carrier has a true specific gravity of 2.5-4.5, a magnetization sigma 1000 as measured in a magnetic field of 1000x(103 / 4 pi )xA / m (1000 oersted) of 15-60 Am2 / kg (emu / g), a residual magnetization sigma r of 0.1-20 Am2 / kg (emu / g) and a resistivity of 5x1011-5x1015 ohm.cm. (b) The first resin has a polymer chain including a methylene unit (-CH2-). (c) The second resin has at least a fluoro-alkyl unit, a methylene unit (-CH2-) and an ester unit. (d) The carrier core is surface-coated with (i) a mixture of the second resin and a coupling agent having at least an amino group and a methylene unit, or (ii) a coupling agent having at least an amino group and a methylene unit, and then with the second resin.
Owner:CANON KK

Aqueous ink, ink jet recording method, ink cartridge, recording unit and ink jet recording apparatus

Provided herein is an aqueous ink, which is excellent in both image density and fixing ability irrespective of the kind of a recording medium even when the volume of an ink droplet is small and has such excellent properties that white stripes are not caused even when high-speed recording is conducted. The aqueous ink comprises at least water, a water-soluble organic solvent, a water-insoluble coloring material, a surfactant and a poor medium for the water-insoluble coloring material and / or a salt. The dynamic surface tension of the aqueous ink at a lifetime of 50 milliseconds determined by a maximum bubble pressure method is higher than 47 mN / m, and the dynamic surface tension at a lifetime of 5,000 milliseconds determined by the maximum bubble pressure method is 38 mN / m or lower.
Owner:CANON KK

Ink Jet Recording Method, Recording Device, Ink/Recording Medium Set, Recording Matter

An ink-jet recording process which conducts recording by imparting ink onto the surface of a recording medium according to recording information, where the recording medium has a base material and a porous ink receiving layer thereon containing inorganic particles having a BET specific surface area of at least 150 m2 / g, and the ink contains a polymer emulsion having a water-insoluble or hardly-soluble colorant contained in polymer fine particles and at least one wetting agent, 8-11 C polyol or glycol ether, anionic or nonionic surfactant, water-soluble organic solvent, and water; and has a surface tension of 40 mN / m or less at 25° C. This process can provide high-grade images excellent in ink absorbing and fixing properties and satisfactory in color tone, produce images excellent in image fastness such as water resistance and light resistance, and implement ink-jet recording excellent in storage stability and discharge stability and free from head clogging at printing.
Owner:RICOH KK

Ink-jet ink, method for preparing the ink-jet ink, ink cartridge containing the ink-jet ink, image forming method using the ink-jet ink, and image formed with the ink-jet ink

An ink-jet ink including a pigment a dispersant, a water, a particulate resin (A) dyed with a fluorescent dye and having an average particle diameter of from 50 to 200 nm, and an emulsion of a self-emulsifiable polyurethane; and a method for preparing the ink-jet ink, an ink cartridge containing the ink-jet ink, an image forming method using the ink-jet ink, and an image formed with the ink-jet ink.
Owner:RICOH KK

Cyan ink, ink set, set of ink and reaction liquid, and image forming method

Provided is a cyan ink applicable to an ink set having four kinds of aqueous inks composed of the cyan ink, a magenta ink, a yellow ink, and a black ink each containing water; a water-insoluble coloring material; and plurality of water-soluble organic solvents including a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for the water-insoluble coloring material. The content of the water-insoluble coloring material in the cyan ink is in a specific range, and the ratio B1 / A1 between the good medium and the poor medium is also in a specific range. A water-soluble organic solvent showing the maximum Ka value out of respective Ka values of the plurality of water-soluble organic solvents is the poor medium. The ratio A / B between the good medium and the poor medium in an arbitrary aqueous ink in the ink set except the cyan ink and B1 / A1 satisfy a specific relationship. The cyan ink provides an image having a sufficiently large area factor even with a small amount of ink droplets, and having a high image density, and is excellent in storage stability and bronzing resistance.
Owner:CANON KK
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