Ricoh Company, Ltd.

Asahi Kasei Kogyo Kabushiki Kaisha

Asahi Kasei Kabushiki Kaisha

Masayuki Fukuoka

Kazukiyo Nagai

Shigeyuki Harada

Yuusuke Koizuka

Keita Katoh

Tomoyuki Shimada

Akihiko Matsuyama

Yoshiki Yanagawa

Akiyoshi Sabu

Takuya Yamazaki

Yuuki Yokohama

Hiroshi Gotou

Mitsuru Naruse

Hiromi Sakaguchi

Michihiko Namba

Shun Saito

Kaori Toyama

Masayasu Nonogaki

Hideaki Nishimura

Hidetoshi Fujii

Takashi Tamai

Shuusuke Someno

Hidehiko Kobayashi

Tatsumi Arakawa

Amika Sagara

Muneaki Kimura

Sayuri Kojima

Yukihisa Masukawa

Shigeakira Saito

An ink set includes an ink A including water, a first organic solvent, and a first pigment and an ink B including water, a second organic solvent, a second pigment, and a urethane resin particle. The first organic solvent includes at least one of N,N-dimethyl-&#x3b2;-buthoxy propionamide, N,N-dimethyl-&#x3b2;-methoxy propionamide, and 3-ethyl-3-hydroxymethyl oxetane and has a mixing solubility parameter A of 10.00 to less than 13.00 and the second organic solvent has a mixing solubility parameter B of 13.00 to 16.00.

Ink set, recording device, and method of recording

An image forming method includes applying an ink for the first time to a recording medium to form an image and rolling up the recording medium in a roll form, wherein the recording medium is continuous paper, the ink includes an organic solvent and a coloring material, and the image recorded matter has a tackiness power of from 80 to 110 nN.

Ink, inkjet recording method, ink cartridge, and image recording 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

An image forming method includes applying an ink for the first time to a recording medium to form an image and rolling up the recording medium in a roll form, wherein the recording medium is continuous paper, the ink includes water, an organic solvent, and a coloring material, and the image has a tackiness power of from 80 to 110 nN.

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

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 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

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

A copolymer contains a structure unit represented by Chemical formula 1 and a structure unit represented by Chemical formula 2, 

A copolymer includes structural units having the following formulae (1) and (2): wherein R represents a hydrogen atom or a methyl group; X represents a hydrogen atom or a cationic ion; and each of L1 and L2 independently represents an alkylene group having 2 to 18 carbon atoms.

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Shizuoka, Japan

Masayuki Fukuoka