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A water-fast cyan ink for use in ink jet printers includes polyeth ylenimine-6 (PEI-6), a metal-chelated azo dye in the form of di sul fonated copper pthalocyanine, and the polysaccharide dextran.
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Ink Jet Ink
A water-fast cyan ink for use in ink jet printers includes polyeth ylenimine-6
(PEI-6), a metal-chelated azo dye in the form of di sul fonated copper
pthalocyanine, and the polysaccharide dextran.
Water soluble, di-sulfonated copper pthalocyanine (Pyrazol Fast Turquoise-
FBL by Sandoz Colors and Chemicals) is desirable for use as a primary
subtractive cyan dye in a color ink jet system because of its superior light-fast
property. The water-fast property of ink using this dye is improved by the use of
the water-soluble polysaccharide dextran, such as those dextrans described on
page 2900, monograph number 2904, of the Merck Index, in conjunction with the
A specific ink formulation in weight % is: Pyrazole Fast Turquoise-FBL
5% Dextran 6% PEI-6 2% Water