Ink Composition for Inkjet Printing

Abstract

The invention provides an ink composition for ink-jet printing which does not cause clogging of nozzles of an ink-jet printer during printing, to thereby provide a print of desired printing quality; which ensures an appropriate drying rate of printed images; and which attains excellent color development. The ink composition for ink-jet printing, containing a pigment, a binder resin, a pigment dispersant, and a solvent, wherein the solvent is formed of (1) at least one glycol ether and at least one of a lactone compound and 2-pyrrolidone, or (2) at least one glycol ether acetate and at least one of cyclohexane and isophorone.

Description

TECHNICAL FIELD [0001] The present invention relates to an ink composition for ink-jet printing and, more particularly, to an ink composition for ink-jet printing which does not cause clogging of nozzles of an ink-jet printer during printing, to thereby provide a print of desired printing quality; which ensures an appropriate drying rate of printed images; and which attains excellent color development. BACKGROUND ART [0002] Hitherto, various pigment ink compositions for ink-jet printing employing a variety of solvents have been proposed. When prints are produced through printing by means of a ink-jet printer employing such a pigment ink composition, in some cases, nozzles of the printer are clogged, thereby providing prints of poor printing quality. In addition, color development of prints obtained by use of such a pigment ink composition is not always satisfactory.DISCLOSURE OF THE INVENTION [0003] The present invention has been conceived in order to solve the aforementioned proble...

AI Technical Summary

Benefits of technology

[0023] The ink composition of the present invention for ink-jet printing may be used with a variety of ink-jet printers; e.g., a charge controlling type ink-jet printer and a drop-on-demand type ink-jet printer. The ink composition of the present invention is suitably employed in printing by means of a large-format ink-jet printer; e.g., an ink-jet printer for printing outdoor articles such as sign displays. When the ink composition of the invention is employed in color graphic printing or printing from a video image, high-contrast images with remarkably high image reproducibility can be obtained.

[0025] By use of the ink composition of the present invention for ink-jet printing, clogging of nozzles of an ink-jet printer which would otherwise occur during printing is prevented. Therefore, a print of desired printing quality can be obtained, and an appropriate drying rate of printed images and excellent color development can be attained. EXAMPLES

[0045] As is clear from Table 1, the inks of Examples 1 to 4 (according to the present invention) exhibited excellent performance in all the tests, indicating that these inks were excellent.

Problems solved by technology

When prints are produced through printing by means of a ink-jet printer employing such a pigment ink composition, in some cases, nozzles of the printer are clogged, thereby providing prints of poor printing quality.

In addition, color development of prints obtained by use of such a pigment ink composition is not always satisfactory.