Ricoh Company, Ltd.

Goo Chemical Company, Ltd.

Keita Katoh

Kazukiyo Nagai

Yuusuke Koizuka

Akihiko Matsuyama

Masayasu Nonogaki

Mitsuru Naruse

Shigeyuki Harada

Masayuki Fukuoka

Minoru Hakiri

Hiroshi Gotou

Yoshiki Yanagawa

Tomoyuki Shimada

Akiyoshi Sabu

Masaki Kudo

Yuuki Yokohama

Hiromi Sakaguchi

Yukiko Takamura

Tomohiro Nakagawa

Akihiko Gotoh

Kazuhiko Umemura

Masahiko Ishikawa

Takuya Yamazaki

Nobuyuki Sakamoto

Takahiro Yoshida

Akiko Bannai

Takeshi Shibuya

Yosuke Matsuoka

Masatomo Takahashi

Mariko Kojima

Ichiroh Fujii

Koji Katsuragi

Yoshiaki Masuda

Masaki Kudoh

Takuya Furuta

Masato Matsumura

An ink contains at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound.

Ink, ink set, ink container, image forming method, and image forming apparatus

An image forming method is provided. The method includes the steps of: applying a liquid composition, comprising a pigment, water, a resin, and an organic solvent, to a recording medium having water-absorptivity to form an image thereon; and winding up the recording medium in a roll form after the applying, wherein the following formulae are satisfied:1.00&#xd7;104.00&#xd7;100.010&#x2264;&#x2264;0.100where B (mg/cm) represents an amount of the organic solvent contained in the image after the winding and A (mg/cm) represents a total amount of the organic solvent contained in the image and the recording medium after the winding.

Image forming method and image forming apparatus

Provided is an ink containing a wax, a plurality of organic solvents, and water, wherein the plurality of organic solvents include a compound having a solubility parameter of 9 or greater but 11 or less and a compound having a saturated vapor pressure at 100&#xb0; C. of 20 mmHg or greater but 400 mmHg or less.

Ink, ink stored container, inkjet recording apparatus, and printed matter

An ink discharge device including an ink, an ink discharge head, and a negative pressure generator is provided. The ink comprises water, a colorant, an organic solvent X having a solubility parameter of from 8.9 to 12.0 and comprising no glycol ether compound, and a copolymer comprising a structural unit represented by the following formula (1): where R1 represents a hydrogen atom or methyl group and Y represents an alkylene group having 2 to 18 carbon atoms. The ink discharge head includes a nozzle to discharge the ink, a plurality of individual liquid chambers in communication with the nozzle, a flow-in channel to let the ink flow into the individual liquid chambers, and a flow-out channel to let the ink flow out from the individual liquid chambers. The negative pressure generator is configured to generate a negative pressure that lets the ink flow out from the individual liquid chambers.

Ink discharge device and ink discharge method

To provide a copolymer including: a structural unit represented by the following General Formula (1) where X represents a hydrogen atom or a cation; a structural unit expressed by the following Structural Formula (1); and a structural unit represented by the following General Formula (2) where R is a hydrogen atom or a methyl group, L is a single bond or &#x2014;(CH)&#x2014;O&#x2014;CO&#x2014; where n is an integer in a range of from 2 through 18, and a carbonyl carbon atom in the &#x2014;(CH)&#x2014;O&#x2014;CO&#x2014; is bound to naphthyl. 

Copolymer, aqueous ink, and ink cartridge

An image forming method includes discharging a liquid containing a color material and water onto a surface of a recording medium; performing spray coating to apply a coating liquid containing wax to the surface of the recording medium, the surface having the discharged liquid; and heating the recording medium to which the coating liquid is applied in the spray coating.

Image forming method and image forming system

Provided is a set of an ink and a print medium, the set including an ink and a print medium, wherein the ink includes at least one organic solvent, polyurethane resin particles, a colorant, and water, wherein the at least one organic solvent includes a compound having a saturated vapor pressure at 100&#xb0; C. of 65 mmHg or greater but 400 mmHg or less, and wherein a sensor output at a critical image peeling point, measured by a microscratching method, of a solid image formed on the print medium in a manner that the ink is attached in an amount of 0.96 mg/cmis 600 or greater.

Set of ink and print medium, inkjet printing method, inkjet printing apparatus, printed matter, ink, and ink stored container

Ink includes a coloring material, an organic solvent, and water, wherein the ink satisfies the following requisites:

Ink, image forming method, image forming apparatus, and recorded matter

A copolymer includes a structure unit represented by Chemical Formula I; and a structure unit represented by Chemical Formula II, 

A copolymer includes the structure unit represented by the following Chemical formula 1 and the structure unit represented by the following Chemical formula 2,  

Copolymer, ink, and ink container

An inkjet recording ink, including: water; a water-soluble organic solvent; a pigment; and a phosphate group-containing copolymer, wherein the phosphate group-containing copolymer contains a structural unit represented by the following General Formula (1) and a structural unit represented by the following General Formula (2): where R1 denotes a hydrogen atom or a methyl group; Mdenotes an alkali metal ion, an organic amine ion, or a hydrogen ion; half or more of Min the copolymer is the alkali metal ion or the organic amine ion, the remainder of Mis the hydrogen ion; n and m each denote an integer of 0 to 6, provided that both of n and m are not 0; and a block of (CHO) and a block of (CHO) may be exchanged with each other, where R2 denotes a hydrogen atom or a methyl group. 

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

An inkjet recording ink, including: water; a water-soluble solvent; a pigment; and a phosphate group-containing copolymer, wherein the phosphate group-containing copolymer includes a structural unit represented by the following general formula (1) and a structural unit represented by the following general formula (2): wherein, in the general formula (1), Rrepresents either of a hydrogen atom and a methyl group; and Mrepresents any of an alkali metal ion, an organic amine ion and a hydrogen ion, one-half or more of the Min the copolymer is an alkali metal ion or an organic amine, and the remainder is a hydrogen ion; wherein, in the general formula (2), Rrepresents either of a hydrogen atom and a methyl group.

Inkjet recording ink and ink cartridge using the ink, inkjet recording apparatus, inkjet recording method and ink recording matter

An ink composition contains (a) a pigment represented by chemical formula 1a or chemical formula 1b, (b) a polymer having a structure unit having a diphosphonic acid group and represented by Chemical formula 2, (c) a hydrosoluble solvent, and (d) water.   

Ink composition, ink cartridge, ink recording device, and recorded matter

An inkjet ink contains water, a hydrosoluble organic solvent, a pigment, polyvinyl pyrolidone, and a copolymer, wherein the copolymer contains a structure unit represented by Chemical formula 1,    

Inkjet ink, method of manufacturing inkjet ink, ink cartridge, and inkjet recording device

An ink for inkjet recording contains water, an organic solvent, a pigment, and a compound represented by the following Chemical formula 1:  In Chemical formula 1, M's each, independently represent protons, cations of alkali metals, ammonium ions, or organic ammonium ions.

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Shizuoka, Japan

Keita Katoh