Ink composition, ink set, and ink jet recording device

Abstract

Provided is an ink composition, an ink set, and an ink jet recording device capable of suppressing generation of foreign matter at a gas-liquid interface when long-term printing is performed using a continuous supply type ink containing container. A printed matter excellent in continuous printing stability and excellent in image fastness can be obtained. An ink composition of the invention is an ink composition to be charged in an ink storage container(30) which includes an ink composition-replenishable ink chamber(340) and an ink inlet(304), and the ink chamber(340) is able to communicate with outside air. The ink composition includes a pigment; an organic compound; and water, and a resolubility index is 0.5 to 10 minutes, the resolubility index indicating a time required for that after the mass of the ink composition is decreased by 50%, the viscosity thereof is returned to an ink viscosity before the mass is decreased by addition of water in an amount equivalent to the decreased mass.

Description

technical field [0001] The present invention relates to an ink composition, an ink set and an inkjet recording device. Background technique [0002] Conventionally, there is known an inkjet recording apparatus which records an image or the like on a recording medium by using minute ink droplets ejected from nozzles of an inkjet recording print head. An inkjet recording device includes an ink container for supplying an ink composition to a recording head. As the ink container, for example, there is a so-called continuous supply type ink container that replenishes (injects) an ink composition into the continuous supply type ink container without replacing the ink container. [0003] Since the continuous-supply ink container that can be replenished with ink is an air-opening container, an air-liquid interface exists in the ink container. In particular, in pigment inks using pigments as colorants, the ink tends to dry at the air-liquid interface, and aggregates of pigments or ...

AI Technical Summary

Problems solved by technology

Therefore, the following problems sometimes occur: gas-liquid dry foreign matter clogs the supply flow path of the ink container, resulting in poor ink supply; gas-liquid dry foreign matter flowing out of the ink container clogs the nozzle; adheres to the nozzle wall surface, causing discharge bending, etc. stability problem

[0006] However, in the ink described in Patent Document 1, it is not sufficient to deal with the ejection failure caused by foreign matter at the gas-liquid interface that occurs when the ink is added and used for a long period of time.

In addition, in the ink described in Patent Document 1, since a dye is used as a colorant, the image fastness of the obtained printed matter is not sufficient.

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