Ricoh Company, Ltd.

Teijin Limited

Tohoku Ricoh Co., Ltd.

Goo Chemical Company, Ltd.

Masayasu Nonogaki

Mitsuru Naruse

Keita Katoh

Akihiko Matsuyama

Kazukiyo Nagai

Yuusuke Koizuka

Minoru Hakiri

Shigeyuki Harada

Masayuki Fukuoka

Yuji Natori

Hideyuki Yamaguchi

Hiroshi Gotou

Kazuhiko Umemura

Nobuyuki Sakamoto

Masatomo Takahashi

Naoya Morohoshi

Takeshi Shibuya

Fumiaki Arai

Masaki Kudo

Shoichi Sugiyama

Yosuke Matsuoka

Hiroshi Tateishi

Hiroshi Tomita

Masahiko Ishikawa

Yoshiaki Masuda

Hitoshi Ueda

Takuya Furuta

Masato Matsumura

Kotaro Kato

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

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 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

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.

Ink for inkjet recording, ink container, and inkjet recording device

An ink composition contains a pigment; a copolymer containing a phosphoric acid group or phosphonic acid group; a hydrosoluble solvent; and water, wherein the pigment is represented by the following chemical formula 1 and satisfies the following relation 1: Y&#x3c;X&#x3c;0.8, where X represents a peak intensity at a Bragg (2&#x3b8;&#xb1;0.2&#xb0;) angle in a range of 2&#x3b8; of from 5.5&#xb0; to 6.0&#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 26.5&#xb0; to 27.5&#xb0; to a CuK&#x3b1; X-ray having a wavelength of 1.541 &#x212b;. 

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

An ink for inkjet recording includes water; a hydrosoluble solvent; a pigment; and a copolymer including a phosphonic acid group. The copolymer including a phosphonic acid group includes structural units having the following formulae (1) and (2): wherein R1 represents a hydrogen atom or a methyl group; and M represents a hydrogen atom, an alkali metal or an organic ammonium; and wherein R2 represents a hydrogen atom or a methyl group; R3 represents an alkyl group having 1 to 4 carbon atoms; and each of n and m represents 0 or an integer of from 1 to 30, provided n+m is from 2 to 30.

Ink for inkjet recording, ink cartridge, and ink-recorded matter

An ink composition contains a pigment; a copolymer comprising a phosphoric acid group or phosphonic acid group; a hydrosoluble solvent; and water, wherein the pigment is represented by the following chemical formula 1 and satisfies the following relation 1:&#x2266;0.20&#x2003;&#x2003;Relation 1 

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 ink for inkjet recording includes water; a hydrosoluble solvent, a pigment, and a copolymer including a salt of a diphosphonic acid group. The copolymer including a salt of a diphosphonic acid group includes structural units having the following formulae (1) and (2): X represents an alkylene group having 1 to 3 carbon atoms, each of Rand Rrepresents a hydrogen atom or a methyl group, Mrepresents an alkali metal ion, an organic ammonium ion or a proton and Zrepresents a hydrocarbon group having 6 to 22 carbon atoms. The alkali metal ion or the organic ammonium ion and the proton may be mixed, and half or more of the Mare alkali metal ions or the organic ammonium ions.

Ink for inkjet recording

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: 

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Shizuoka, Japan

Masayasu Nonogaki