Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1992-12-17
1993-11-02
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 22R, 106 22H, 106 20D, C09D 1102
Patent
active
052580644
ABSTRACT:
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.
REFERENCES:
patent: 4838940 (1989-06-01), Kan et al.
patent: 4853037 (1989-08-01), Johnson et al.
patent: 4920361 (1990-04-01), Arahara et al.
patent: 5062892 (1991-11-01), Halko
Byorick Judith L.
Klemanski Helene
Xerox Corporation
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