An inkjet ink comprising water, colorant, and a dynamic surface active agent at an effective concentration such that the ink has a dynamic surface tension DST1 sec at 1 second universal surface age, a dynamic surface tension DST10 sec at 10 seconds universal surface age and a dynamic surface tension DST20 min at 20 minutes universal surface age, where DST20 min is less than each of DST1 sec and DST10 sec, and the difference between DST10 sec and DST20 min is greater than 9.2 mN/m at 21° C. or the difference between DST1 sec and DST20 min is greater than 15.5 mN/m at 21° C., and wherein the static surface tension of the ink is less than 50 mN/m. Maintaining a relatively large dynamic surface tension difference between the indicated time scales yields an optical density improvement in printed images.
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机译：一种包含有效浓度的水，着色剂和动态表面活性剂的喷墨油墨，以使该油墨在1秒的通用表面老化时具有动态表面张力DST 1 sec ，动态表面张力DST < Sub> 10秒（在10秒的通用表面年龄下）和动态表面张力DST 20 min （在20分钟的通用表面年龄下），其中DST 20 min 小于DST 1秒和DST 10秒分别为DST 10秒和DST 20 min 在21°C时大于9.2 mN / m，或者在21°C时DST 1 sec 和DST 20 min 之差大于15.5 mN / m。其中油墨的静态表面张力小于50mN / m。在指示的时间标度之间保持相对较大的动态表面张力差可改善打印图像的光密度。
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