Seiko Epson Corporation

Ryosuke Teramoto

Yuho Miyake

Tetsuya Aoyama

Hiromi Ohori

Kazuhiko Kitamura

Yasuhiro Oki

Yasunari Ikeda

Shigemi Wakabayashi

Hiromi Iseki

Shintaro Hama

Tadahiro Mizutani

Shun Oya

Miharu Kanaya

Tomohiro Aruga

Akio Ito

Daisuke Ishihara

Hideo Shimamura

Hiroko Hayashi

Kiyomi Kumamoto

Yukiko Ii

Kazuma Tsutsumi

An ink composition contains dyes A and B. Dye A has a width at a half height of the largest peak in the absorption spectrum between 380 nm and 780 nm that is 50 nm or less. Dye B has a corresponding width at the half height that is 70 nm or more. Dye A is present in an amount of 40% by mass or more and 90% by mass or less of the total mass of the dyes.

Ink composition, ink set, recording method, and ink jet recording apparatus

An ink composition contains water, at least one surfactant, and a pigment. The pigment has a specific surface area of 10 m/g or more and 50 m/g or less as determined by pulsed NMR at 30&#xb0; C.

Ink composition and recording method

An ink composition of the invention is an ink composition to be charged in an ink storage container which includes an ink composition-replenishable ink chamber and an ink inlet, and the ink chamber is able to communicate with outside air. The ink composition includes a pigment; an organic compound; and water, and a resolubility index is 0.5 to 10 minutes, the resolubility index indicating a time required for that after the mass of the ink composition is decreased by 50%, the viscosity thereof is returned to an ink viscosity before the mass is decreased by addition of water in an amount equivalent to the decreased mass.

Ink composition, ink set, and ink jet recording device

An ink composition at least contains a compound A having a hydroxy group and a compound B having an aldehyde group as polyoxyalkylene alkyl ether surfactants. The mass ratio of the compound B to the compound A is 0.5&#xd7;10to 30&#xd7;10.

There is provided an ink set including at least: a yellow ink; a magenta ink; and a cyan ink, in which the yellow ink includes one or more kinds selected from a group consisting of coloring materials represented by the following Formulae (Y-1) and (Y-2), the magenta ink includes one or more kinds selected from a group consisting of coloring materials represented by the following Formulae (M-1) and (M-2), and the cyan ink includes one or more kinds selected from a group consisting of coloring materials represented by the following Formulae (C-1) and (C-2).

Ink set

An aqueous ink set for ink jet recording includes an aqueous pigment ink containing water and a pigment as a coloring agent and an aqueous dye ink containing water and a dye as a coloring agent, in which the concentration of the divalent metal ions of the pigment ink is 10 ppm or more, and the potassium ion concentration of the dye ink is 50 ppm or less.

Aqueous ink set for ink jet recording, recording method, and ink jet recording apparatus

There is provided an ink composition, including: a dye (M-2); a dye (Y-1); an alkylene oxide adduct of acetylene glycol having a main chain of 12 or more carbon atoms; acetylene glycol having a main chain of 10 or more carbon atoms; and a polyoxyalkylene alkyl ether, in which the content ratio A of the dye (M-2) and the dye (Y-1) (the dye (M-2):the dye (Y-1)) is 1.25:1 to 4.75:1.

Ink composition and ink set

There is provided an ink composition, including: a combination of specific dyes, in which the dynamic contact angle of the ink to a silicon wafer is 24&#xb0; or lower at 100 msec after dropping, and is 9&#xb0; or lower at 5,100 msec after dropping.

Ink composition

There is provided an ink composition including: a predetermined dye (C-1); a dye (C-2) containing at least one of C.I. Direct Blues 86 and 199; an alkylene oxide adduct of an acetylene glycol having a main chain of 12 or more carbon atoms; an acetylene glycol having a main chain of 10 or more carbon atoms; and a polyoxyalkylene alkyl ether, in which the content ratio A of the dye (C-1) and the dye (C-2) (the dye (C-1):the dye (C-2)) is 7:3 to 9.5:0.5, and the content of the dye (C-1) is 2.0 mass % to 5.0 mass %.

An ink composition includes, as dyes, a dye (Bk-1) represented by the formula (Bk-1); and a dye (Bw-1) represented by the formula (Bw-1), in which a content ratio A (dye (Bk-1):dye (Bw-1)) of the dye (Bk-1) and the dye (Bw-1) is 100:18 to 100:40.

A liquid accommodating container in which a fiber member and a liquid are accommodated has a fiber ratio of the fiber member is 5% or more to 30% or less, a fiber diameter of the fiber member is 10 &#x3bc;m or more to 50 &#x3bc;m or less, a volume average particle diameter (D50) of a pigment included in the liquid satisfies a condition of 50 nm&#x3c;D50&#x3c;150 nm.

Liquid accommodating container

An ink composition is used in an ink jet recording apparatus including a recording head that includes a nozzle plate having a nozzle aperture through which the ink composition is ejected, and a flow channel substrate having a communication hole acting as a flow channel through which the ink composition flows. The nozzle plate and the flow channel substrate are bonded together with an adhesive such that the communication hole communicates with the nozzle aperture. The ink composition contains a coloring material, an acetylene glycol-based surfactant having an HLB value of 9 or less, and at least one of the compounds expressed by general formula (1): RO&#x2014;(CH&#x2014;CH&#x2014;O)&#x2014;Ror general formula (2): (R)&#x2014;N-{L-(COOM)}.

Ink composition, ink jet recording apparatus, and ink jet recording system

A liquid accommodating container in which a fiber member and a liquid are accommodated has a fiber ratio of the fiber member is 5% or more to 30% or less, a fiber diameter of the fiber member is 10 &#x3bc;m or more to 50 &#x3bc;m or less, a volume average particle diameter (D50) of a pigment included in the liquid satisfies a condition of 50 nm&#x3c;D50&#x3c;150 nm, and a maximum particle diameter is 200 nm or less.

Disclosed are an ink composition containing at least one of a porphyrazine compound or a salt thereof and an aromatic compound having a sulfo group or a salt thereof, an ink jet recording method using the ink composition and a recorded material recorded by the recording method.

Ink composition, ink jet recording method using the same and recorded material

Disclosed are an ink composition at least containing a porphyrazine compound or a salt thereof and an aromatic compound having a carboxy group and/or a salt thereof, an ink jet recording method using the ink composition and a recorded material recorded by the recording method.

Growing community of inventors

Matsumoto, Japan

Ryosuke Teramoto