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 polyphosphoric acid thereto. Also disclosed is a process for preparing an ink composition which comprises (a) forming a mixture by admixing water and polyphosphoric 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. 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 polyphosphoric acid and the base create a buffer system in the ink which adjusts the ink to the desired pH, and also enables improved latency and waterfastness.
本发明公开了一种制备油墨组合物的工艺,该工艺包括:(a) 将
水和碱混合形成混合物;(b) 向混合物中加入
着色剂;(c) 加入多
磷酸调节混合物的 pH 值。还公开了一种制备油墨组合物的工艺,该工艺包括:(a) 将
水和多
磷酸混合形成混合物;(b) 向混合物中加入
着色剂;(c) 加入碱调节混合物的 pH 值。进一步公开的是通过这些工艺制备的油墨组合物。此外,还公开了一些工艺,包括将这些油墨加入喷墨打印设备中,并使油墨液滴按图像方向喷射到基底上。聚
磷酸和碱的存在在油墨中形成了一个缓冲系统,可将油墨调节到所需的 pH 值,同时还能改善潜伏期和耐
水性。