Ricoh Company, Ltd.

Goo Chemical Company, Ltd.

Akihiko Matsuyama

Yuusuke Koizuka

Kazukiyo Nagai

Keita Katoh

Mitsuru Naruse

Shigeyuki Harada

Yoshiki Yanagawa

Tomoyuki Shimada

Akiyoshi Sabu

Kiyofumi Nagai

Minoru Hakiri

Nozomu Tamoto

Tatsuya Niimi

Hidetoshi Kami

Eiji Kurimoto

Hiroshi Gotou

Hiroshi Goto

Hiroshi Tamura

Tetsuro Suzuki

Michihiko Namba

Akihiko Gotoh

Naoya Morohoshi

Kazuhiko Umemura

Masayuki Koyano

Tamotsu Aruga

Yohta Sakon

Keishi Taniguchi

Hiroshi Ikuno

Narihito Kojima

Hiroshi Nagame

Tomohiro Nakagawa

Takahiro Yoshida

Masanori Hirano

Akiko Bannai

Masayasu Nonogaki

Takuya Yamazaki

Masayuki Fukuoka

Yuuki Yokohama

Koichiro Oyama

Ichiroh Fujii

Tohru Ohshima

Amika Sagara

Masaki Kudo

Takashi Tamai

Masahiko Ishikawa

Takeshi Shibuya

Hisashi Habashi

Katsuichi Ohta

Shigeru Kusakata

Shigeo Hatada

Ryohichi Kitajima

Mayumi Yoshihara

Yuka Miyamoto

Nobuyuki Sakamoto

Yosuke Matsuoka

Masatomo Takahashi

Hiroshi Adachi

Hidetoshi Fujii

Mariko Kojima

Yuji Natori

Yoshiaki Masuda

Yukihiro Imanaga

Masaki Kudoh

Kento Sugita

Masato Matsumura

Takuya Furuta

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 ink includes at least one polyether-modified siloxane compound, and at least one aliphatic alcohol alkylene oxide compound. The mass ratio of the polyether-modified siloxane compound to the aliphatic alcohol alkylene oxide compound in the ink is from 95/5 to 50/50.

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

An ink comprises a pigment, a quinacridone derivative represented by the following Chemical formula 1. 

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

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 and cleaning liquid set includes an ink comprising a coloring material and a resin and a cleaning liquid comprising water and at least one type of organic solvent, wherein the ink in a dried form has a glass transition temperature of from 40 to 90 degrees C. and the swelling ratio calculated from a mass of a film of the ink in a dried form before and after immersion in the cleaning liquid is 10 percent or greater according to the following relationship 1: swelling ratio (percent)=100&#xd7;[(B&#x2212;A)/A] Relationship 1, where A represents the mass of the film before the immersion and B represents the mass of the film after the immersion.

Ink and cleaning liquid set, inkjet printing device, inkjet printing method, and method of cleaning nozzle surface of inkjet discharging head

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 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

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, 

Copolymer, aqueous ink, and ink cartridge

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

Growing community of inventors

Shizuoka, Japan

Akihiko Matsuyama