Seiko Epson Corporation

Tomoki Maruyama

Yusuke Mizutaki

Jun Ito

Tomohiro Aruga

Kiyomi Kumamoto

Masahiro Yatake

Tetsuya Aoyama

Tomohito Nakano

Satoshi Tsubamoto

Yuji Tabata

An ink jet ink composition includes: an acetoacetanilide-based monoazo pigment coated with a water-insoluble polymer; 1-(2-hydroxyethyl)-2-pyrrolidone; and water.

Ink jet ink composition and ink set

An ink jet composition according to an embodiment of the present disclosure is an ink jet composition which is ejected from an ink jet head, the ink jet head has a nozzle plate in which nozzles are formed and a flow path substrate which is bonded to one surface of the nozzle plate and in which flow paths including a liquid storage chamber to store a liquid to be supplied to the nozzles are formed, the liquid storage chamber is formed of a recess provided in a surface of the flow path substrate opposite to the nozzle plate, and the ink jet composition has a surface tension of 31 mN/m or less at 25° C.

Ink jet composition

An ink set includes a process color ink set including a yellow ink, a magenta ink, a cyan ink, and a black ink as process color inks, and a light ink having a color similar to a corresponding one of the process color inks in the process color ink set. The yellow ink, the magenta ink, and the cyan ink each have a maximum absorption wavelength, and each have a full width at half maximum of a peak including the maximum absorption wavelength. A maximum absorbance in a visible light wavelength range of the light ink is 70% or less of a maximum absorbance in the visible light wavelength range of the corresponding one of the process color inks.

Ink set

An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a disperse colorant, with the volume-average particle diameter of the disperse colorant being 110.0 nm or more and 200.0 nm or less, and also contains at least one organic solvent with an SP of 9 or more, with the percentage thereof being 10.0% by mass or more.

Ink jet recording apparatus, ink jet recording method, and ink composition

An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a water-soluble dye and a polyhydric alcohol with a normal boiling point of 270&#xb0; C. or above, with the percentage of the polyhydric alcohol being 26.0% by mass or less of the total amount of the ink composition.

An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded. The ink composition contains a disperse colorant, with the volume-average particle diameter of the disperse colorant being 105.0 nm or less.

An ink jet recording apparatus includes an ink composition, an ink encasement in which the ink composition is encased, a recording head that ejects the ink composition, and a carriage configured to move the recording head back and forth. The carriage carries the ink encasement, with the ink encasement integrated with the carriage. The ink encasement has an ink fill port that opens and shuts as a port through which the ink composition is loaded and also has a detector that detects the amount of ink composition encased. The ink composition contains a surfactant with an HLB of 6 or less.

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Matsumoto, Japan

Tomoki Maruyama