WATER-BASED INK, METHOD OF INK-JET RECORDING, INK CARTRIDGE, RECORDING UNIT, AND APPARATUS FOR INK-JET RECORDING

摘要

A water-based ink having such excellent properties that it is excellent in image density and fixability regardless of the kind of recording medium even when the volume of each ink droplet is small and that the ink gives images having no white streaks in high-speed recording. The water-based ink comprises water, a water-soluble organic solvent, a water-insoluble colorant, a surfactant, and a poor solvent for the water-insoluble colorant and/or a salt. The water-based ink is characterized in that the dynamic surface tension of the water-based ink as measured by the maximum bubble pressure method at a lifetime of 50 msec is higher than 47 mN/m and the dynamic surface tension thereof as measured by the maximum bubble pressure method at a lifetime of 5,000 msec is 38 mN/m or lower.