Ricoh Company, Ltd.

Akihiko Gotoh

Kiyofumi Nagai

Michihiko Namba

Mariko Kojima

Akiko Bannai

Naoya Morohoshi

Kakuji Murakami

Hitoshi Arita

Nobutaka Osada

Tomohiro Inoue

Masayuki Koyano

Hisashi Habashi

Takashi Tamai

Tomoko Maeda

Tohru Ohshima

Tetsuya Kaneko

Akihiko Matsuyama

Yuuki Yokohama

Tomohiro Nakagawa

Tamotsu Aruga

Kazuo Tsubuko

Toshiroh Tokuno

Tsuyoshi Asami

Hiroshi Gotou

Keita Katoh

Yoshihiro Moriya

Hidetoshi Fujii

Ichiroh Fujii

Masaki Kudo

Kazuyo Mizuno

Hiroshi Goto

Masahide Yamashita

Kazuhiko Umemura

Eisuke Hori

Tsutomu Maekawa

Koji Katsuragi

Tatsuya Morita

Shinya Seno

Yukio Tabata

Nobutaka Kinoshita

Shosuke Aoai

Makoto Okawara

Masaki Kudoh

Akihiro Koseki

Provided is a method for coating inks, the method including coating a plurality of kinds of inks on a target by an inkjet method individually, wherein the target includes a base and a gel layer provided on the base and containing a vinyl chloride resin and a plasticizer, wherein the plurality of kinds of inks are oil-based inks and include an ink x and an ink y that is to be discharged after the ink x is discharged, and wherein an interpenetration ratio Pxy of the inky to the ink x is 7.0% or greater but 13.0% or less.

Method for coating inks, method for producing wallpaper, image forming set, image forming system, ink, and ink set

An ink application method is provided. In the method, an ink is discharged to an object by an inkjet method, to apply the ink to the object. The object includes a base material and a gel layer overlying the base material, and the gel layer includes a vinyl chloride resin and a plasticizer. The ink is an oil-based ink. When a free induction decay curve of the object obtained by a pulse NMR method is separated into two curves respectively derived from a hard component and a soft component, the curve derived from the hard component accounts for 35% to 40% of the free induction decay curve, and the curve derived from the soft component has a spin-spin relaxation time of from 30.0 to 45.0 ms when obtained by a Hahn echo method.

Ink application method and method for producing wallpaper

A cleaning filling liquid for inkjet device including water; 10.0% by mass to 45% by mass per whole amount of the cleaning filling liquid of an amide compound having following formula (1). 

Cleaning filling liquid, cartridge, cleaning filling method, and inkjet recording device

To provide an image forming method, including applying a pre-treatment liquid on a recording medium including a substrate and a coating layer at least on one surface of the substrate, wherein the pre-treatment liquid is applied on a surface of the recording layer with the coating layer; drying the recording medium on which the pre-treatment liquid has been applied; and forming an image on the recording medium after drying by discharging a water-based ink by inkjet method, wherein the pre-treatment liquid includes a water-soluble cationic polymer, an ammonium salt of an organic acid and water, and wherein the water-based ink includes water and negatively charged colored particles including a colorant.

Image forming method, image forming apparatus, and recorded matter

An overcoating liquid contains a hydrodispersible polyurethane; a compound represented by Chemical formula 1: CF&#x2014;CHCHO(CHCHO)H, where n represents an integer of from 1 to 40; a compound represented by Chemical formula 2: HORRC&#x2014;(CH)&#x2014;CRROH, where Rand Reach, independently represent alkyl groups having three to six carbon atoms, Rand Reach, independently represent methyl groups or ethyl groups, and n represents an integer of from 1 to 6; and water, wherein the overcoating liquid is applied to the surface of a recording medium onto which inkjet ink is already discharged.

Overcoating liquid, ink set, image forming method, and image forming apparatus

An inkjet recording ink, including: water; a water-soluble organic solvent; a colorant; a compound containing a group expressed by the following Structural Formula (1), and a defoamer, CF&#x2014;CHCH&#x2014; Structural Formula (1).

Inkjet recording ink, ink cartridge, inkjet recording method, and inkjet recording apparatus

A cleaning liquid used for cleaning an ink flow channel in an inkjet recorder includes water; a hydrosoluble organic solvent; a compound having the following formula (1): wherein n represents an integer of from 1 to 40; and a compound having the following formula (2): wherein Rand Rindependently represent an alkyl group having 3 to 6 carbon atoms; Rand Rindependently represent a methyl group or an ethyl group; and n represents an integer of from 1 to 6.

Inkjet recorder ink flow channel cleaning liquid

Ink containing a pigment, an alcohol alkoxylate-based surfactant, a water-soluble organic solvent, water, and a dispersion agent represented by the following chemical structure 1, wherein the ink has a dynamic surface tension of 36 mN/m or less when the life of foam at 25&#xb0; C. as measured by the maximum bubble pressure technique is 15 msec: where Rrepresents an alkyl group having one to four carbon atoms, an aryl group, and an aralkyl group having one to eight carbon atoms, L represents zero or an integer of from 1 to 7, and n represents an integer of from 20 to 80.

Ink for inkjet recording, inkjet recording method using the ink, and ink cartridge that accommodates the ink

An inkjet ink, which contains water, an organic solvent, a surfactant, and a colorant, wherein the organic solvent contains at least one polyhydric alcohol having an equilibrium moisture content of 30% by mass or higher at a temperature of 23&#xb0; C. and humidity of 80% RH, at least an amide compound represented by the general formula (I), and at least one selected from the group consisting of compounds represented by the following general formulae (II) to (IV): 

Inkjet ink, inkjet recording method, and inkjet recording device

An ink set, used in an inkjet recording apparatus equipped with a recording head including: a plurality of nozzle arrays, each including a plurality of nozzles; and a sucking-and-covering unit for covering the recording head, wherein the black ink is supplied to one of the plurality of the nozzle arrays of the recording head, and the color ink is supplied to the other plurality of the nozzle arrays of the recording head, wherein the black ink includes resin-coated carbon-black particles, surfactant-treated carbon-black particles and water, wherein the color ink includes resin-coated color-pigment particles, surfactant-treated color-pigment particles and water, and wherein the ink set satisfies Expression (1), Expression (2) and Expression (3) below:5.0% by mass&#x2266;()&#x2266;12.0% by mass&#x2003;&#x2003;Expression (1)3.0% by mass&#x2266;()&#x2266;10.0% by mass&#x2003;&#x2003;Expression (2)[()/()]&#x3c;[()/()]&#x2003;&#x2003;Expression (3).

Ink set and inkjet recording method

An inkjet recording apparatus including an ink; and an ink discharging head configured to discharge the ink, wherein the ink discharging head is provided with a nozzle having a silicone-containing water-repellent film on a surface thereof on which the ink contacts, wherein the ink contains a colorant; water; and a water soluble organic solvent, wherein the colorant contains a carbon black partially coated with a resin, and wherein the ink meets the following expressions (1) and (2):1.0&#xd7;10/100&#x3c;1.0&#xd7;10&#x2003;&#x2003;(1)20.0&#x3c;&#x2266;100.0&#x2003;&#x2003;(2)

Inkjet recording apparatus, method for inkjet recording, and ink

An inkjet recording ink including a water-soluble organic solvent, a colorant, at least one fluorine-based surfactant having a chemical structure represented by Structural Formula (I) below, and water, 

Inkjet recording ink containing fluorine based surfactant, inkjet recording ink set, and inkjet recording apparatus containing the inkjet recording ink

Inkjet recording treatment liquids include: at least one water-soluble organic solvent; water; at least one compound according to formula (I) wherein: each of Rand Rindependently represents H, a lower alkoxy group, or a lower perfluoroalkoxy group; each of Rand Rindependently represents a lower perfluoroalkyl group; each of p, q, and r is independently an integer of 1 to 24; m is an integer of 1 to 28; and n is an integer of 0 to 10; and at least one compound according to formula (II) wherein: each of R5, R6, and R7 independently represents a lower alkyl group, a lower perfluoroalkoxy group, or F; and M is Li, Na, or K. Methods of inkjet recording, inkjet recording apparatus, storage bags, and cartridges employing the inkjet recording treatment liquids are also provided.

Inkjet recording treatment liquid, inkjet cartridge, inkjet recording ink set, and inkjet recording method

An inkjet recording ink containing a colorant, a surfactant A, a surfactant B, a water soluble organic solvent, and water, wherein the surfactant A is expressed by any one of Structural Formula (1) and Structural Formula (2), and the surfactant B is expressed by Structural Formula (3): in Structural Formula (1), R1 represents hydrogen, an alkyl group, or an acyl group; Rf represents &#x2014;CFor &#x2014;CFCF; and m, n and p are natural numbers; in Structural Formula (2), M represents alkali metal, ammonium, phosphonium, or alkanolamine; Rf represents &#x2014;CFor &#x2014;CFCF; and q is a natural number; in Structural Formula (3), Rand Reach represent hydrogen or an alkyl group; and r, s, t and u are natural numbers. 

Inkjet recording ink, inkjet recording inkset, ink cartridge, inkjet recording method, and recorded matter

The present invention provides a recording ink set containing a black ink, a cyan ink, a magenta ink, and a yellow ink, each of which contains water, a water-insoluble color material, a water-soluble organic solvent, and a surfactant, wherein the black ink and at least one of the inks other than the black ink respectively contain a different water-soluble organic solvent; and the surface tension of the water-soluble organic solvent(s) used only for the inks other than the black ink is higher than that of the water-soluble organic solvent used only for the black ink; and the present invention also provides a recording method using the recording ink set.

Recording ink, recording ink set, records, ink cartridge, recording method, and inkjet recording apparatus

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Kanagawa, Japan

Akihiko Gotoh