Canon Kabushiki Kaisha

Masanori Jinnou

Kunihiko Nakamura

Jun Yoshizawa

Shin-ichi Sato

Tomohiro Yamashita

Daiji Okamura

Yoshihide Aikawa

Kuniaki Fujimoto

Yoshihisa Takizawa

An ink jet ink is provided with which metallic luster appearing in printing on a recording medium, i.e. the bronze phenomenon is kept from occurring and good images can be obtained. The ink jet ink includes at least a coloring material which is a compound represented by a specific general formula, and further contains a specific amine compound.

Ink jet ink, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus

Provided is an ink jet ink containing a coloring material having a buffer region in an ink use range, the ink jet ink being capable of suppressing the occurrence of the deterioration (dissolution) of a heating portion surface in contact with liquid; and the disconnection of wiring for applying a voltage to a heating portion even when long term continuous printing is performed. The ink jet ink is used for an ink jet recording apparatus equipped with a recording head having a heating portion surface in contact with liquid comprising a metal and/or a metal oxide. The ink jet ink contains a coloring material in a content (mass %) of 3 mass % or more with respect to the total mass of the ink jet ink. The coloring material is a colorant having a buffer region in an ink use range, and comprises a compound represented by the following general formula (I) and/or a compound represented by the following general formula (II) H(OCHCH)R. &#x2003;&#x2003;General formula (II)

Provided is an ink jet ink comprising at least a coloring material comprising a compound represented by the general formula (I) or a salt thereof; and a compound represented by the general formula (II). Thereby, there can be provided an ink jet ink that provides image quality comparable to silver halide photograph and provides a recorded article having high light fastness 

Ink jet ink, ink set, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus

An ink jet ink is disclosed which includes water, a water-soluble organic solvent and a coloring material and has excellent properties. The coloring material is a specific phthalocyanine derivative and is contained in a specific amount in the ink. The water-soluble organic solvent includes a specific amount of 2-pyrrolidone. In addition, a dvalue is in a specific range where the dvalue corresponds to 75% of a dispersion distance distribution, measured by a small angle X-ray scattering method, of molecular aggregates in the ink jet ink whose coloring material concentration is adjusted to 0.5 mass %.

There is provided an ink jet light-color ink which is excellent in color developability and is capable of achieving compatibility between environmental gas resistance and bronze resistance. The ink jet light-color ink to be used in combination with ink jet deep-color ink has a relatively large coloring material content, and comprises at least water, a water-soluble organic solvent, and a coloring material. The ink jet deep-color ink and the ink jet light-color ink satisfy specific conditions.

Ink jet light-color ink, ink set, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus

There is provided ink jet ink containing at least a coloring material, in which: the coloring material is a compound represented by the following general formula (I) or a salt thereof; a content (weight %) of the coloring material is 3.0 weight % or more with respect to a total weight of the ink jet ink; in a dispersion distance distribution, measured by a small-angle X-ray scattering method, of molecular aggregates in the ink jet ink whose coloring material concentration is adjusted to 3.0 weight %, a dispersion distance dvalue corresponding to 75% of the distribution is 6.50 nm or more and 7.10 nm or less: 

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Yokohama, Japan

Masanori Jinnou