Ricoh Company, Ltd.

Goo Chemical Company, Ltd.

Minoru Hakiri

Mitsuru Naruse

Shin Hasegawa

Masayasu Nonogaki

Keita Katoh

Akihiko Matsuyama

Hiroyuki Fushimi

Kazukiyo Nagai

Yuusuke Koizuka

Hideo Watanabe

Keishi Kubo

Nobuhiro Takigawa

Keishi Taniguchi

Naoya Morohoshi

Yasuyuki Hosogi

Yuji Natori

Shigeo Hatada

Kanjirou Kawasaki

Shuhei Shiraishi

Kanzirou Kawasaki

Nobuyuki Sakamoto

Yosuke Matsuoka

Masatomo Takahashi

Masaaki Kobayashi

Eiichi Kawamura

Youji Ide

Motoo Tasaka

Hiroki Sugiyama

Mitsuru Maeda

Kanjiro Kawasaki

Takuya Furuta

Masato Matsumura

Kazuhiro Hasebe

Shinn Hasegawa

Ryouchi Shimura

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 inkjet ink is provided. The inkjet ink includes water; a penetrant, a pigment, and a polymer compound. The polymer compound includes a unit (A) including a functional group having the below-mentioned formula (1) or (2), and another unit (B) including a carboxyl group. The unit (A) is included in the polymer compound in an amount of from 30% to 90% by weight based on the total weight of the polymer compound. 

Inkjet ink, ink cartridge containing the inkjet ink, inkjet recording method using the inkjet ink, inkjet recording apparatus using the ink cartridge, and print formed by the inkjet ink

Inkjet ink contains a pigment, a hydrosoluble solvent, and water, wherein the pigment is represented by the following chemical formula 1 and has a CuK&#x3b1; X-ray diffraction spectrum having a wavelength of 1.541 &#x212b; such that no main peak is observed at a Bragg (2&#x3b8;&#xb1;0.2&#xb0;) angle in a range of 2&#x3b8; of from 28.0&#xb0; to 29.0&#xb0;, 

Inkjet ink, ink cartridge, inkjet recording device, and inkjet printed matter

An ink for inkjet recording, which is used for recording on a paper having a concentration of an eluted Ca ion of from 1.0&#xd7;10to 5.0&#xd7;10g/g when dipped in pure water. The ink includes at least a pigment, a pigment dispersant, a water-soluble organic solvent and water. The pigment dispersant is a copolymer synthesized using at least (1) unsaturated ethylene monomer having a phosphoric acid group or a phosphonic acid group and (2) unsaturated ethylene monomer having an alkyl group having 12 to 22 carbon atoms.

Ink for inkjet recording, and ink cartridge, inkjet recording method, inkjet recorder, ink-recorded matter and method of producing the ink-recorded matter using the ink

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 structural formula (1): 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 ammonium ion, an organic amine ion and a hydrogen ion, one-half or more of the Min the copolymer is an alkali metal ion, an organic ammonium ion or an organic amine, and the remainder is a hydrogen ion: 

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

An inkjet recording ink, including: water; a wetting agent; a colorant; and polymer microparticles, wherein the polymer microparticles are each a copolymer of a monomer represented by the following structural formula (1) or the following general formula (2), a monomer represented by the following general formula (3), and a macromonomer represented by the following general formula (4):   

Inkjet recording ink, ink cartridge, and inkjet recording method

An ink composition contains a pigment represented by the following chemical formula 1; a hydrosoluble solvent; and water, wherein the pigment satisfies the following relation 1:0.040&#x3c;Y/X&#x3c;0.200 (Relation 1), where, in a CuK&#x3b1; X-ray diffraction spectrum having a wavelength of 1.541 &#x212b;, X represents a peak intensity at a Bragg (2&#x3b8;&#xb1;0.2&#xb0;) angle in a range of 2&#x3b8; of from 26.5&#xb0; to 27.5&#xb0; and Y represents a peak intensity at a Bragg (2&#x3b8;&#xb1;0.2&#xb0;) angle in a range of 2&#x3b8; of from 11.0&#xb0; to 11.5&#xb0;: 

Ink composition, recording method, printed matter, ink cartridge, and inkjet recording device

An inkjet recording ink set, which contains at least: a black pigment ink; and a color pigment ink, wherein the black pigment ink contains a black pigment treated with an anionic surfactant, and a black pigment coated with a resinous polymer, and water, and the black pigment ink is a pigment dispersion liquid where the black pigment treated with the anionic surfactant and the black pigment coated with the resinous polymer are dispersed in the water, and wherein the color pigment ink contains a color pigment, a nonionic surfactant, and water, and the color pigment ink is a pigment dispersion liquid where the color pigment is dispersed in the water with assistance of the nonionic surfactant.

Inkjet recording ink set and ink cartridge, and recording device, image forming method, and image-formed article using such ink set

An ink for inkjet recording including a pigment, a penetrating agent and water, wherein the pigment includes: an ozone-oxidized carbon black, including carbon black oxidized by ozone and having a volatile matter content of the carbon black of 10% by mass to 20% by mass and a BET specific surface area of 90 m/g to 150 m/g; and a resin-coated carbon black, including: carbon black; and a resin present on a surface of the carbon black.

Ink for inkjet recording, ink cartridge and inkjet recording apparatus

An inkjet recording ink including a carbon black, a dispersant, a polyurethane resin particle, and water, where the carbon black is a channel black, a gas black, or a mixture of channel black and a gas black, and the polyurethane resin particle is an anionic self-emulsifying ether-based polyurethane resin particle, wherein the anionic self-emulsifying ether-based polyurethane resin particle has an acid value of 40 to 120 and a mass average molecular weight of 500 to 50,000, and an average primary particle diameter of 20 nm or less.

Inkjet recording ink, ink cartridge, inkjet printing apparatus and image forming method

An inkjet ink including water, a pigment, a polymer, and a hydrazine compound. The polymer does not include an anionic unit and includes a first unit having a carbonyl group capable of reacting with a hydrazino group, and a second unit having at least one of an amino group, a dimethylamino group, and a diethylamino group. The content of the first unit is from 40% to 90% by weight based on the weight of the polymer, and the inkjet ink has a pH of not less than 9.

Inkjet ink, pigment dispersion, image forming method, inkjet recording apparatus, ink cartridge, and print

Ink for ink jet recording containing a coloring agent, water, an aqueous organic solvent, and a polyacrylic acid ester-based polymer represented by the following chemical structure: 

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Shizuoka, Japan

Minoru Hakiri