Seiko Epson Corporation

Chie Saito

Miharu Kanaya

Kiyohiko Takemoto

Masaaki Itano

Masayuki Momose

An ink set including two or more kinds of ink compositions including at least a black ink composition and a color ink composition, in which the black ink composition includes a self-dispersion type pigment having a hydrophilic group on the surface thereof, the color ink composition includes a self-dispersion type pigment having a hydrophilic group on the surface thereof with a phenyl group, and all the ink compositions include resin emulsion, is used in an ink jet recording method. Provision of an ink set for ink jet recording, which is capable of realizing a good image, in addition to high color developability, high ejection stability, high clogging recovering properties, and high fixability.

Ink set, and ink jet recording method using the ink set

An ink set for ink jet recording that realizes a satisfactory image in addition to high color-developing ability, high ejection stability, and high recover ability from clogging is provided. An ink set contains two or more ink compositions at least including a black ink composition and a color ink composition. The black ink composition includes a self-dispersing pigment having a hydrophilic group on the surface thereof and the color ink composition includes a self-dispersing pigment having a hydrophilic group on the surface thereof with a phenyl group interposed therebetween. The ink set is used for an ink jet recording method.

A pigment dispersed liquid prepared by heat-treating an aqueous pigment dispersion containing a self-dispersing pigment, but not a dispersing resin.

Pigment dispersed liquid, ink composition for inkjet recording, and ink cartridge, recording method, recording system and article recorded using the same

A yellow ink composition includes C.I. Pigment Yellow and C.I. Pigment Yellow 74 as coloring agents. The ratio of a C.I. Pigment Yellow 185 content (percent by weight) to a C.I. Pigment Yellow 74 content (percent by weight) is in the range of 0.5 to 15. The yellow ink composition has a C.I. Pigment Yellow 185 content of 10% to 20% by weight and a C.I. Pigment Yellow 74 content of 10% to 20% by weight.

Yellow ink composition, ink set, recording method using them, and record

A yellow ink composition comprises C. I. Pigment Yellow 185 used as a colorant and has a pigment concentration of 10 to 20 weight percent.

Yellow ink composition, ink set, ink jet recording method using ink set, and record

The invention provides an ink composition for ink jet recording comprising at least a resin emulsion and a surface-treated pigment, wherein the amount of monomers and oligomers with a molecular weight of 2,000 or less contained in the resin emulsion is 1,000 ppm or less based on the total amount of the ink composition. Also disclosed are an ink jet recording method using the ink composition and recorded matter obtained by the recording method.

Ink composition for ink jet recording, and recording method and recorded matter using the same

Provided is an ink-jet recording apparatus equipped with an ink set included from n types (n is an integral number where n&#x2267;2), wherein the ratio of viscosity of ink of the minimum viscosity/viscosity of ink of the maximum viscosity in the ink set is 0.6 or less; wherein viscosity at 20&#xb0; C. of the respective inks of the ink set is set to V, V, . . . , Vi, . . . , Vn (where Vis the maximum viscosity); wherein the nozzle resolution of a discharge nozzle allocated to the respective inks is set to R, R, . . . , Ri, . . . , Rn; and wherein when coefficient ki=Vi/V, (i is an arbitrary integral number of 1 to n), 0.8&#xd7;ki&#xd7;R&#x2266;Ri&#x2266;1.2&#xd7;ki&#xd7;R, and 0.2&#x2266;ki&#x2266;1.0 is realized for every i.

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Matsumoto, Japan

Chie Saito