Ricoh Company, Ltd.

Akiyoshi Sabu

Yukiko Nakajima

Tomoyuki Shimada

Kazukiyo Nagai

Yoshiki Yanagawa

Yuusuke Koizuka

Shigeyuki Harada

Shinya Nakayama

Akihiro Kotsugai

Yoshihiro Moriya

Akihiko Matsuyama

Takuya Yamazaki

Daiki Yamashita

Ryota Inoue

Shingo Sakashita

Masayuki Fukuoka

Masahide Yamada

Yoshitaka Yamauchi

Taichi Nemoto

Suzuka Amemori

Keiji Makabe

Atsushi Yamamoto

Keita Katoh

Hideyuki Santo

Keiko Osaka

Koichiro Oyama

Toyoshi Sawada

Hiroshi Yamashita

Junichi Awamura

Takamasa Hase

Hiroshi Yamada

Tsuyoshi Sugimoto

Yasuo Katano

Hiroshi Gotou

Michihiko Namba

Yohichiroh Watanabe

Satoshi Mochizuki

Yasutada Shitara

Hidetoshi Fujii

Daisuke Asahina

Tatsuya Morita

Rintaro Takahashi

Amika Sagara

Kousuke Nagata

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

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

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 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, 

Provided is an ink including: copolymer including at least one of structural unit of formula (1) and structural unit of formula (2); pigment having acid value of &#x2266;15 &#x3bc;mol/g and represented by formula (3); water; and water-soluble organic solvent. In formula (1), Rrepresents hydrogen or methyl group. Lrepresents alkylene group including 2-18 carbon atoms. In formula (2), Rrepresents hydrogen or methyl group. Lrepresents single bond or &#x2014;(CH)n-O&#x2014; of which oxygen is bound with biphenyl. n represents integer of 2 through 18. In formula (3), Rrepresents any one of hydrogen, halogen, alkyl group including 1-4 carbon atoms, alkoxy group including 1-4 carbon atoms, hydroxy, nitro, and alkyl substituted or unsubstituted amino group including 1-4 carbon atoms. n represents integer of 1 through 5. When n is a plural number, Rmay be identical or different. R, R, and Rrepresent alkyl group including 1-4 carbon atoms. 

Ink, ink stored container, inkjet printing method, and inkjet printing device

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

A toner including a crystalline resin wherein the crystalline resin contains a crystalline resin having a urethane bond, a urea bond or both thereof, and wherein the crystalline resin has an average crystallite diameter of 20 nm to 70 nm.

Toner, developer, and image forming apparatus

A copolymer includes structural units having the following formulae (1) and (2): wherein each of R1 and R2 independently represents a hydrogen atom or a methyl group; X represents a hydrogen atom or a cationic ion; and L represents a single bond or &#x2014;(CH)&#x2014;O&#x2014;, the oxygen atom of which is bonded with the biphenyl; and n represents an integer of from 2 to 18.

An ink includes water, a pigment, and a copolymer, wherein the copolymer contains a structure unit represented by the following Chemical formula 1,  

Ink, ink cartridge, inkjet recording device, and copolymer

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Shizuoka, Japan

Akiyoshi Sabu