Aqueous ink composition, process for preparing the same, and ink

Compositions: coating or plastic – Coating or plastic compositions – Marking

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106 3132, 106 3148, 106 315, 106 3151, 106 3152, C09D 1102

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active

060866608

ABSTRACT:
An aqueous ink composition containing urea, an azo dye colorant, and water, with dissolved ammonium ion and nitrogen contents lower than 200 ppm and 5 ppm, respectively. The composition is highly stable to elevated temperatures and extended storage times, and gives excellent printing quality. Methods for making the inventive ink compositions, and methods of using the compositions in ink jet recording are also disclosed.

REFERENCES:
patent: 5092926 (1992-03-01), Owatari
patent: 5637138 (1997-06-01), Yamazaki
patent: 5645630 (1997-07-01), Yamazaki
patent: 5755861 (1998-05-01), Fujioka et al.
patent: 5824142 (1998-10-01), Yamazaki
Copy of European Search Report for EP Application No. 99 10 2096 dated May, 17, 1999.

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