Brother Kogyo Kabushiki-kaisha

Takeo Kitahara

Shunichi Higashiyama

Masaya Fujioka

Hideto Yamazaki

Masahito Kato

An inventive ink comprises a water-soluble dye or a pigment as a coloring agent, 5 to 15% by weight of polyvalent alcohol monoalkyl ether selected from the group consisting of tetraethylene glycol monoalkyl ethers and pentaethylene glycol monoalkyl ethers, 5 to 50% by weight of polyvalent alcohol, and pure water. When recording is performed in accordance with the ink-jet recording system by using the inventive ink, an excellent result is obtained from any viewpoint concerning, for example, the recording characteristic, the fixation to an objective recording material, the quick drying characteristic, the printing quality characteristic, and the low odor characteristic. The inventive ink is useful as an ink to be used for ink-jet recording apparatuses based on various recording systems, making it possible to obtain an excellent recording result.

Water based ink and ink-jet recording method

A recording ink composition comprises pure water, a water-soluble dye, a polyvalent alcohol, and phosphoric acid. When iron is contained as an impurity in the recording ink composition, the iron and phosphoric acid form a ferric (III) phosphato complex ion represented by �Fe(HP0.sub.4)(H.sub.2 O)!.sup.+. Owing to the formation of the complex ion, the recording ink composition is prevented from discoloration which would be otherwise caused by iron ion. Further, the recording ink composition is prevented from formation and deposition of iron compounds. Therefore, the obtained ink has an excellent color tone, and the ink avoids blocking at a nozzle of a printing head or the like of an ink-jet printer.

Recording ink, ink cartridge containing the same, and ink-jet recording

A water-based magenta ink composition comprises an aqueous medium and a magenta dye dissolved therein, which employs Color Index Number Acid Red 52 as the magenta dye and contains 5 to 15% by weight of a polyhydric alcohol alkyl ether having a vapor pressure of 0.1 mmHg or below at 20.degree. C.

Water-based magenta ink composition and ink-jet recording process

A water-based magenta ink composition comprising an aqueous medium, a magenta dye dissolved therein and a pH adjuster, where, as the magenta dye, Color Index Number Acid Red 52 is used; as the pH adjuster, a basic organic compound is used; and the pH of the water-based magenta composition is adjusted to a value within the range of from 8 to 10.

Water-based magenta INK composition and ink-jet recording process

A recording ink which includes at least water, a pigment as a colorant, polyvinyl pyrrolidone as a water-soluble polymer, and a compound having a polyoxyethylene chain. The compound having a polyoxyethylene chain may be replaced by a compound having a fluorinated hydrocarbon group.

Recording ink containing pigment particles and polyvinyl pyrrolidone

A water-based recording magenta ink composition comprises a magenta dye dissolved in a mixed solvent of water and a water-soluble organic solvent. The magenta dye comprises Color Index Number Acid Red 52 and the water-soluble organic solvent comprises at least one of 2-pyrrolidinone, .beta.-thiodiglycol and 1,5-pentanediol.

Water-based recording magenta ink composition and ink-jet recording

A water color ink for recording, including a yellow ink, a magenta ink and a cyan ink, wherein the yellow ink contains color index number Acid Yellow 23 at 0.7 to 3 wt %, the magenta ink contains a dye mixture of color index number Acid Red 52 and color index number Acid Red 289 at 0.7 to 3 wt %, and the cyan ink contains color index number Acid Blue 9 at 0.7 to 3 wt %, and an ink-jet recording process using the same.

Water color ink for recording and ink-jet recording process

A water-based black recording ink comprises an aqueous medium and a colorant dissolved or dispersed therein, where the colorant comprises a first colorant, having a transmission color having L* of 4 or below and C*ab of 25 or below in the L*a*b* color system, and a second colorant, and a closed angle between the hue angle of the first colorant and that of the second colorant on the a*-b* plane in the L*a*b* color system is 90.degree. or greater.

Growing community of inventors

Nagoya, Japan

Takeo Kitahara