Brother Kogyo Kabushiki-kaisha

Satoshi Okuda

Mitsunori Maeda

Akihiko Taniguchi

Junichiro Sugimoto

Shunichi Higashiyama

Kazuma Goto

Narumi Koga

Ryuji Kato

Yuka Tsuzaka

Tatsunosuke Hoshi

Tatsuyoshi Nagase

Masaya Fujioka

Tomoyo Hamajima

Kenjiro Imai

Atsushi Nakamura

Eiji Kawamura

Atsushi Ito

Noriaki Satoh

Yasuhiro Taga

Yuki Okumura

Masaharu Ito

Koichiro Hara

A water-based ink for ink-jet recording includes dyes and water. The dyes include a blue dye having a hue angle of 220&#xb0; to 280&#xb0;; a yellow dye having a hue angle of 70&#xb0; to 120&#xb0;; and a copper phthalocyanine dye. A mass ratio (C/B) of a content (C) of the copper phthalocyanine dye to a content (B) of the blue dye in an entire amount of the water-based ink is equal to or more than 0.5, and a total content of the dyes in the entire amount of the water-based ink is equal to or more than 6% by mass.

Water-based ink for ink-jet recording

There is provided a water-based ink for ink-jet recording including: water; a self-dispersible black pigment; and a resin-dispersed pigment of which hue angle is in a range of 180&#xb0; to 270&#xb0; and of which sedimentation velocity in the water-based ink is slower than sedimentation velocity of the self-dispersible black pigment in the water-based ink. A ratio (R/S) of a solid content weight (R) of the resin-dispersed pigment to a solid content weight (S) of the self-dispersible black pigment in the water-based ink is in a range of 0.26 to 0.80.

Water-based ink for ink-jet recording and ink container

A water-based ink set for ink-jet recording includes: a water-based yellow ink containing water and a yellow dye having a blending amount in an entire amount of the water-based yellow ink of 2 to 3% by weight, the water-based yellow ink having a hue angle of 45&#xb0; to 65&#xb0;; a water-based magenta ink containing water and a magenta dye having a blending amount in an entire amount of the water-based magenta ink of 2 to 3% by weight, the water-based magenta ink having a hue angle of 340&#xb0; to 360&#xb0; or 0&#xb0; to 5&#xb0;; a water-based cyan ink containing water and a cyan dye having a blending amount in an entire amount of the water-based cyan ink of 2 to 3% by weight, the water-based cyan ink having a hue angle of 200&#xb0; to 230&#xb0;; and a water-based black ink containing water and a black dye having a blending amount in an entire amount of the water-based black ink of 6 to 7.5% by weight.

Water-based ink set for ink-jet recording and ink-jet recording apparatus

There is provided a water-based ink for ink-jet recording including: water; a self dispersible black pigment of which mean particle diameter is not less than 140 nm; and a resin-dispersed pigment which is a copper phthalocyanine-based pigment and of which sedimentation velocity in the water-based ink is slower than sedimentation velocity of the self-dispersible black pigment in the water-based ink.

There is provided a water-based ink for ink-jet recording containing: water; at least one of quinacridone and a derivative thereof; and a dye represented by the following formula (1). 

Water-based ink for ink-jet recording and ink cartridge

Disclosed is a treatment solution for ink jet recording, including: an aggregating agent; water; and tetraethylene glycol monobutyl ether and pentaethylene glycol monobutyl ether, wherein: tetraethylene glycol monobutyl ether and pentaethylene glycol monobutyl ether are contained by 1 % by weight to 10 % by weight in total in the treatment solution; and a weight ratio (X:Y) of tetraethylene glycol monobutyl ether (X) to pentaethylene glycol monobutyl ether (Y) is 50:50 to 90:10.

Treatment solution for ink-jet recording, water-based ink set for ink-jet recording, ink-jet recording method, and ink-jet recording apparatus

Disclosed is a water-based ink for ink jet recording, including: a colorant; water; and tetraethylene glycol monobutyl ether and pentaethylene glycol monobutyl ether, wherein: tetraethylene glycol monobutyl ether and pentaethylene glycol monobutyl ether are contained by 1% by weight to 10% by weight in total in the water-based ink for ink jet recording; and a weight ratio (X:Y) of tetraethylene glycol monobutyl ether (X) to pentaethylene glycol monobutyl ether (Y) is 50:50 to 90:10.

Water-based ink for ink-jet recording, ink cartridge, water-based ink set for ink-jet recording, ink-jet recording method, and ink-jet recording apparatus

A water-based ink for ink-jet recording includes a self-dispersible pigment modified by phosphate group; water; a water-soluble organic solvent; at least one of a cationic polymer and basic amino acid; and at least one selected from the group consisting of boric acids, a chelate agent, a reducing sugar and a sugar alcohol.

Water-based ink for ink-jet recording and cartridge

A water-based ink for ink jet recording includes a self-dispersible pigment modified by phosphate group; water; a water-soluble organic solvent; a cationic surfactant which is contained at 0.001% by weight to 0.05% by weight in the water-based ink for ink jet recording; and at least one selected from the group consisting of boric acids, a chelate agent, a reducing sugar and a sugar alcohol.

A water-based ink includes a dye (1) represented by the general formula (1); a dye (2) at least one dye selected from the group consisting of a dye having free acid that is represented by the general formula (2-1), C. I. Acid Red 52 and 289; DPP; and a surfactant represented by the general formula (3). The dyes, DPP, and the surfactant are blended so as to satisfy the conditions (A) to (D). 

Water-based ink for ink-jet recording, ink cartridge and ink-jet recording apparatus

A water-based ink includes a dye represented by the general formula (1), water, DPP, and a surfactant represented by the general formula (2). The dye, DPP, and the surfactant are blended so as to satisfy the conditions (A) to (C). 

A water-based ink for ink-jet recording includes a dye represented by the general formula (1); water; dipropylene glycol propyl ether (DPP); and a surfactant represented by the general formula (2). The dye, DPP, and the surfactant are blended so as to satisfy the conditions (A) and (B). 

A magenta ink for ink-jet recording contains a coloring agent, water and a water soluble organic solvent. Different types of dyes are employed as the coloring agent. In particular, a dye (1) represented by the general formula (1) is used together with at least one dye selected from the group consisting of a dye (2) represented by the general formula (2) in a free acid form, C. I. Acid Red 289 and C. I. Acid Red 52. 

Magenta ink for ink-jet recording

An ink set for ink-jet recording is formed from a yellow ink in which C. I. Direct Yellow 132 and C. I. Direct Yellow 86 are employed, a magenta ink in which a specific pyrazolylazopyridine-based (or pyrazolylazopyrazine-based) dye and another specific dye are employed, and a cyan ink in which two specific types of copper phthalocyanine-based dyes are employed.

Ink set for ink-jet recording

In one embodiment, the disclosure relates to an ink-jet head including an ink chamber, a pressure chamber in communication with the ink chamber, a nozzle for ejecting an ink in communication with the pressure chamber, a piezoelectric actuator for applying an ejection pressure to an ink in the pressure chamber, and an ink passage extending from a boundary of the ink chamber to a tip of the nozzle. The tip of the nozzle has an aperture diameter of from about 15 to about 25 &#x3bc;m, and the ink passage is configured such that when an ink having a viscosity of from about 2.5 to about 3 mPa&#xb7;s is passed therethrough, a passage resistance value of the ink passage is from about 50 to about 100 kPa&#xb7;s/mm. Another embodiment of the disclosure relates to an ink-jet recording device containing such an ink-jet head.

Growing community of inventors

Kiyosu, Japan

Satoshi Okuda