| 摘要 |
Disclosed is a process for preparing an ink composition which comprises (a) forming a mixture by admixing water and a base; (b) adding a colorant to the mixture; and (c) adjusting the pH of the mixture by adding phosphorous acid thereto. Also disclosed is a process for preparing an ink composition which comprises (a) forming a mixture by admixing water and phosphorous acid; (b) adding a colorant to the mixture; and (c) adjusting the pH of the mixture by adding a base thereto. Further disclosed are ink compositions prepared by these processes. One embodiment is directed to an ink composition which comprises water, a colorant, and phosphorous acid. Another embodiment of the present invention is directed to an ink composition which comprises water, a colorant, and a phosphite salt. Additionally disclosed are processes which comprises incorporating these inks into an ink jet printing apparatus and causing droplets of the ink to be ejected in an imagewise pattern onto a substrate. The presence of phosphorous acid and the base create a buffer system in the ink which adjusts the ink to the desired pH, and also enables improved latency, recoverability, and waterfastness.
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