Brother Kogyo Kabushiki-Kaisha

Narumi Koga

Shunichi Higashiyama

Masaya Fujioka

Kazuma Goto

Michiko Aoyama

Tomoyo Hamajima

Narumi Kawai

Hiromitsu Sago

Hideo Ohira

Masashi Tsuda

Naomichi Kobayashi

Ryuji Kato

Junichiro Sugimoto

Akihiko Taniguchi

Satoshi Okuda

Yasuhiro Taga

Noriatsu Aoi

Tatsunosuke Hoshi

Hideto Yamazaki

Yoshito Toyoda

Mayuko Okada

Atsushi Ito

Kazuo Kobayashi

Koichiro Hara

Masateru Kawamura

Masaharu Ito

Tomoyo Ogura

Masaya Fuijoka

An ink set containing a water-based ink for ink jet recording and a treatment liquid. The water-based ink contains a phosphate group-modified self-dispersing pigment, water, and a water-soluble organic solvent. The treatment liquid contains a monovalent metal ion, water, and a water-soluble organic solvent.

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

An ink set containing a water-based ink for ink jet recording and a treatment liquid. The water-based ink contains a phosphate-group modified self-dispersing pigment, water, and a water-soluble organic solvent. The treatment liquid contains an aggregating agent, water, and a water-soluble organic solvent. A dynamic surface tension of the water-based ink, measured under the condition where a life time is about 50 ms, is in the range of 35 mN/m to 45 mN/m. A dynamic surface tension of the treatment liquid, measured under the condition where a life time is about 50 ms, is in the range of 33 mN/m to 45 mN/m.

Ink set and ink-jet recording method

A water-based ink for ink jet recording, containing: a coloring agent; water; and a water-soluble organic solvent. The coloring agent contains a phosphate group-modified self-dispersing pigment. The water-based ink further contains at least one of a reducing sugar and a sugar alcohol and a calcium ion.

Water-based ink for ink jet recording

A water-based ink for ink jet recording, containing: a coloring agent; water; and a water-soluble organic solvent. The coloring agent contains a phosphate group-modified self-dispersing pigment. The water-based ink further contains at least one selected from the group consisting of boric acid, diglycolic acid, and a chelating agent.

The present invention provides a water-based black ink for ink-jet recording, containing a coloring agent and water. The coloring agent contains a yellow dye, a magenta dye, and a cyan dye. The yellow dye contains a dye (Y) represented by the following general formula (1). The magenta dye contains a dye (M) represented by the following general formula (2). The cyan dye contains a phthalocyanine dye (C). The dye (Y), the dye (M), and the phthalocyanine dye (C) are blended so as to satisfy the following conditions (a) and (b). 

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

A water-based ink for ink-jet recording includes a coloring agent, water, and a water-soluble organic solvent. The coloring agent includes the following dye (1) and dye (2). The water-based ink is good in clearness, color development, and preservation stability as well as good in toughness of a recording material recorded using the water-based ink. 

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

An ink set for ink-jet recording includes a plurality of color inks, wherein the following formulae (a) to (d) are satisfied.Light OD reduction rate (%)=[()/]&#xd7;100&#x2003;&#x2003;(a)Ozone OD reduction rate (%)=[()/]&#xd7;100&#x2003;&#x2003;(b)Total OD reduction rate (%)=&#x3c;about 40%&#x2003;&#x2003;(c)max&#x2212;min&#x3c;about 15%&#x2003;&#x2003;(d)'A' and 'B' are OD values before and after a light fastness test for a first single-color patch, respectively, and &#x201c;c&#x201d; and &#x201c;D&#x201d; are OD values before and after an ozone resistance test for a second single-color patch, respectively. &#x201c;Zmax&#x201d; and &#x201c;Zmin&#x201d; are a maximum and a minimum of all the total OD reduction rates (Z), respectively.

Ink set for ink-jet recording

A water base ink for ink-jet recording contains a self-dispersible coloring agent, a propylene glycol ether, and a surfactant represented by the following general formula (3):R&#x2014;O&#x2014;(CHCHO)&#x2014;SOM&#x2003;&#x2003;(3) wherein Rrepresents an alkyl group having a number of carbon atoms of 12 to 15, M represents Na or triethanolamine, and n represents an integer of 2 to 4, and wherein the propylene glycol ether is dipropylene glycol propyl ether. The ink satisfies three requirements of i) the satisfactory initial introduction performance of the ink into an ink flow passage of a stacked type printer head, ii) the prevention of the occurrence of feathering, and iii) the prevention of the insufficient spread of the ink.

Water base ink for ink-jet recording and ink-jet printer accomodating same

A water-based ink for ink-jet recording enables the expression of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of medium to high lightness. The inks include a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less. The color ink (A) and the color ink (B) satisfy the following expression (I):about 120&#xb0;&#x2266;|&#x3b1;&#x2212;&#x3b2;| about &#x2266;240&#xb0;&#x2003;&#x2003;(I)wherein &#x3b1; is the hue angle of the color ink (A) and &#x3b2; is the hue angle of the color ink (B). The chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.

Water based ink for ink jet recording and ink jet recording method

The invention relates to an ink-jet recording apparatus having a nozzle provided on a nozzle face of an ink-jet head and a cleaning device for cleaning the nozzle face. The cleaning device contains a gas with a solubility in water lower than that of air in water.

Ink-jet recording apparatus

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.

A water base ink for ink-jet recording is provided, which makes it possible to secure a high recording quality with a sharp image area edge by avoiding any blurring even when recording is performed on regular paper and which has satisfactory purge restoration performance. Therefore, no bubble remains in an ink flow passage, and no discharge failure is caused. Further, the discharge operation never becomes unstable. In the water base ink for ink-jet recording, the surface tension is not less than 40 mN/m, and the amount of dissolved oxygen is not more than 4 mg/L.

Water base ink for ink-jet recording

A water-based ink for ink-jet recording and an ink-jet recording method allow the formation of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of a medium lightness to a high lightness (e.g., an achromatic image in dark gray to light gray) in ink-jet recording. The water-based ink combination for ink-jet recording comprises a black ink, and a color ink (A) and a color ink (B) that satisfy a color relationship of the following expression (I):about 120&#xb0;&#x2266;|&#x3b1;&#x2212;&#x3b2;|&#x2266;about 240&#xb0;&#x2003;&#x2003;(I)wherein &#x3b1; is the hue angle of the color ink (A) and &#x3b2; is the hue angle of the color ink (B).

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

According embodiments of the present disclosure, a water-based ink set for ink-jet recording is provided. The ink set may contain a black ink, a cyan ink, a magenta ink and a yellow ink. Each ink may contain a polyoxyethylene alkyl ether sulfonate.

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Nagoya, Japan

Narumi Koga