Ricoh Company, Ltd.

Takuya Yamazaki

Shigeyuki Harada

Yoshiki Yanagawa

Yuusuke Koizuka

Tomoyuki Shimada

Kazukiyo Nagai

Akihiko Matsuyama

Akiyoshi Sabu

Masayuki Fukuoka

Koichiro Oyama

Takuya Saiga

Hiroshi Gotou

Keita Katoh

Takahiro Yoshida

Michihiko Namba

Hidetoshi Fujii

Amika Sagara

Ryo Miyakoshi

Chikako Hatta

An aqueous dispersion contains emulsion resin particles that contains pigment enclosing emulsion resin particles enclosing an inorganic pigment, wherein the pigment enclosing emulsion resin particles have a 50 percent cumulative volume particle diameter (D50) of from 40 to 300 nm as measured by laser diffraction scattering method, wherein the pigment enclosing emulsion resin particles have an average aspect ratio of from 1.0 to 1.5.

Aqueous dispersion, method of manufacturing aqueous dispersion, and ink

An ink contains water, a pigment, and a polymer having a structure unit represented by the following Chemical structure 1, 

Ink, ink accommodating unit, recording method, recording device, and method of manufacturing ink

An ink contains water, a coloring material, and a polymer having a structure unit represented by the following Chemical formula 1 and a structure unit having an anionic group, 

Ink, ink accommodating container, recording device, recording method, and recorded matter

Ink includes water, a coloring material, and a copolymer including a first structure unit represented by the following Chemical formula 1 and a second structure unit including an anionic group.  In the Chemical formula, R represents a hydrogen atom or a methyl group, X represents an alkylene group having 2-4 carbon atoms, and Y represents a substituted or non-substituted straight-chain alkylene group having 5 to 7 carbon atoms.

Ink, method of manufacturing ink, and ink cartridge

An ink, includes water; a coloring material; and a cross-linked copolymer having a structure unit represented by the following Chemical formula 1, and a structure unit represented by the following Chemical formula 2, 

Ink, ink cartridge, image forming method, and printed matter

An ink includes water; a coloring material, and a polymer including a structure unit represented by the following Chemical formula 1 and a structure unit represented by the following Chemical formula 2 or the following Chemical formula 3, where R and T each, independently represent hydrogen atoms or methyl groups, L and N each, independently represent single bonds or carbonyl groups, M and Q each, independently represent naphthyl groups or biphenyl groups, p represents an integer of from 2 to 12, and q represents an integer of from 1 to 3.

Ink, ink accommodating container, image forming method, and image forming device

A copolymer including a structural unit represented by General Formula (1) below, and a structural unit represented by General Formula (2) below, where, in General Formula (1), Ris a hydrogen atom or a methyl group, Lis an alkylene group having 2 or greater carbon atoms but 5 or less carbon atoms, and X is a hydrogen atom or a cation, where, in General Formula (2), Ris a hydrogen atom or a methyl group and Lis an alkylene group having 2 or greater carbon atoms but 18 or less carbon atoms.

Copolymer, ink including copolymer, and ink-stored container

An ink includes a pigment, a wax, a water soluble solvent including a solvent having an SP value of from 9.0 to 11.0, and water, wherein the mass ratio of the content of the wax in the ink to the content of the solvent having an SP value of from 9.0 to 11.0 is in a range of from 1.0:2.5 to 1.0:25.0.

Ink, ink container, inkjet recording device, and recorded matter

Provided is an ink containing water, a coloring material, and a copolymer, wherein the copolymer contains a structural unit represented by any one of general formulae (1a), (1b), and (1c) below and a structural unit containing an anionic group, where Rrepresents a hydrogen atom or a methyl group, a represents an integer of from 6 through 10, and b represents an integer of 0 or 1, where Rrepresents a hydrogen atom or a methyl group, c represents an integer of 3 or 4, and d represents an integer of 0 or 1, where Rrepresents a hydrogen atom or a methyl group and e represents an integer of from 2 through 10.

Ink and method for producing same, and ink stored container, printing method, and printing apparatus

An ink is provided. The ink includes a quinacridone pigment and an organic solvent having a solubility parameter of from 9.00 to 11.80 in an amount of from 30% to 60% by mass of total mass of the ink. Both a viscosity change rate and a particle diameter change rate of the ink, before and after the ink is heated at 80&#xb0; C. for 4 weeks in a sealed state, are in the range of from &#x2212;5% to 1%.

Ink, method for producing ink, ink storage container, recording device, and recording method

An ink includes a pigment a quinacridone compound represented by Chemical formula 1, and a copolymer including the structure unit represented by Chemical formula 2 or Chemical formula 3.  In Chemical formula 1, R, R, R, and Reach, independently represent hydrogen atoms, halogen atoms, or alkyl groups having 1-4 carbon atoms, R, R, and Reach, independently represent alkyl groups having 1-4 carbon atoms or alkylene groups having 1-4 carbon atoms, and m represents 1 or 2,  In Chemical formula 2, Rrepresents a hydrogen atom or a methyl group and Lrepresents an alkylene group having 2-16 carbon atoms,  In Chemical formula 3, R9 represents a hydrogen atom or a methyl group, L2 represents a single bond or &#x2014;(CH)&#x2014;O&#x2014; and n represents an integer of 2-16.

Ink, recorded matter, ink container, recording device, and recording method

Provided is an ink containing a copper phthalocyanine pigment, wherein an absorbance ratio (Y/X) of a local minimum absorbance Y of the ink in a wavelength range of from 665 nm through 675 nm to a local maximum absorbance X of the ink in a wavelength range of from 610 nm through 620 nm is 0.660 or greater but 0.740 or less.

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

A copolymer including a structural unit represented by General Formula (1) below and a structural unit represented by General Formula (2) below, where, in General Formula (1), R is a hydrogen atom or a methyl group and X is a hydrogen atom or a cation, where, in General Formula (2), L is an alkylene group having 2 or more but 18 or less carbon atoms.

Copolymer, coloring material dispersion, ink, and ink store container

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

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Shizuoka, Japan

Takuya Yamazaki