Patent ID: 8757776
Filing Date: 2014-06-24
Classification: B41J,C09D

Abstract:
1. An ink jet ink which is to be supplied to a recording head in which the recording head comprises a common liquid chamber from which a liquid is to be fed, a plurality of pressure chambers for developing pressure applied to the liquid, a plurality of individual channels through which the liquid is introduced respectively into the plurality of pressure chambers from the common liquid chamber, and a group of nozzles which communicate respectively with the pressure chambers in order to eject the liquid therefrom; the group of nozzles being constituted of a first nozzle group including first nozzles arranged along a first side of the common liquid chamber and a second nozzle group including second nozzles arranged along a second side across from said first side of the common liquid chamber, the second nozzles each having a same ejection volume and each having longer individual channels than those of the first nozzles, wherein along a direction of the common liquid chamber each of the first nozzles is arranged at an arrangement interval of less than 30 μm relative to each of the second nozzles; wherein with respect to a horizontal alignment across the common liquid chamber, each of the first nozzles is misaligned horizontally relative to each of the second nozzles; wherein the ejection volume of the first nozzles is larger than the ejection volume of the second nozzles; wherein the ink jet ink comprises at least an aqueous medium, a surfactant and a coloring material; and wherein the aqueous medium consists essentially of water and at least one water-soluble organic compound containing at least one alkanediol, and the aqueous medium has a surface tension of from 40 mN/m or more to less than 60 mN/m in an environment of a temperature of 25° C. and a humidity of 50%.