Brother Kogyo Kabushiki-Kaisha

Mayuko Okada

Shunichi Higashiyama

Masaya Fujioka

Kazuma Goto

Hideo Ohira

Michiko Aoyama

Yoshito Toyoda

Tatsunosuke Hoshi

Narumi Koga

Hideto Yamazaki

Kazuo Kobayashi

Junichiro Sugimoto

Narumi Kawai

Hiromitsu Sago

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

An ink for ink-jet recording contains tripropylene glycol normal butyl ether or dipropylene glycol normal propyl ether, an acrylic polymer, a water-insoluble coloring agent, and water. The ink simultaneously satisfies the straight travel stability of ink droplets during the discharge with an ink-jet recording apparatus, the recovery performance upon introduction into a recording head of the ink-jet recording apparatus, the fixation performance of printed matters, and the drying performance after the printing.

Ink for ink-jet recording

A water base pigment ink for ink-jet recording contains a pigment, water, and at least one of polyethylene glycol and diglycerol. The ink is solidified into a solid matter when the water is evaporated. Further, the solid matter is redissolved in the unsolidified water base pigment ink for ink-jet recording. When the ink is used, then neither clog-up of a nozzle nor discharge failure is caused, no load is imposed by the solidified ink on the maintenance system such as the wiping equipment, and the sticking performance on the paper is satisfactory.

Water base pigment ink for ink-jet recording

A water base ink for ink-jet recording is provided, which is excellent in time-dependent stability of ink characteristics, which can be stably jetted over a long period of time, and which makes it possible to perform the high quality recording. The water base ink for ink-jet recording contains a self-dispersing type water-insoluble particulate coloring agent, a compound represented by the following formula (1), a surfactant having a nitrogen atom in a molecule, water, and a water-soluble organic solvent, wherein a surface tension is 30 to 50 mN/m, and a ratio of change of the surface tension after storage at 60&#xb0; C. for 2 weeks is less than 5%:R&#x2014;O&#x2014;(CHCHO)&#x2014;SONa&#x2003;&#x2003;(1)

Water base ink for ink-jet recording and method for preparing water base ink for ink-jet recording

A water base ink for ink-jet recording, which is usable for an ink-jet recording apparatus having an ink-jet head provided therein with an ink flow passage formed of nickel or nickel alloy, includes a coloring agent, water, and a water-soluble organic solvent. The ink is blended so that a current density, which is obtained within an electric potential range of &minus;600 to &plus;300 mV, is not more than 100 &mgr;A/cm when anodic polarization measurement is performed by using a reference electrode of silver/silver chloride, a counter electrode of platinum, and a working electrode of nickel or nickel alloy. The ink does not corrode any part for constituting the flow passage in the ink-jet head.

Water base ink for ink-jet recording and ink-jet recording apparatus provided with the same

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Toyota, Japan

Mayuko Okada