| 摘要 |
PROBLEM TO BE SOLVED: To obtain an ink jet ink being less problematic in jetting ink drops in incorrect directions and in nozzle accidents and giving a high-quality high- resolution print at a high speed by mixing at least one colorant with a wetting agent and a first cosolvent comprising a substituted or unsubstituted lactam or amide or a mixture thereof. SOLUTION: This ink desirably contains a penetrant in addition to the above components and is a water-base one. As a second cosolvent for the colorant, desirably about 8 to 17 wt.% tetraethylene glycol is used, and the first cosolvent used in combination with this is a lactam (e.g. 2-pyrrolidone) in an amount of about 4 to 15 wt.%. The penetrant used is a polyorganosiloxane and is used in an amount of about 0.1 to 10 wt.%. Other desirable additives include a chelating agent (e.g. EDTA), a biocide, a viscosity improver and a buffer (e.g. sodium borate). |
