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Cyan ink formulation
| Details |
Inventors: Adamic, Raymond J; Sader, Richard A; Byers, Gary W; Bruinsma, Paul J.; Doumaux, Howard A.; Iu, Kai Kong; Anderson, Richard; Lauw, Hiang P;
Assignee: Hewlett-Packard Development Company, L.P. (Houston, TX)
Primary Examiner: Klemanski; Helene
Assistant Examiner:
Attorney, Agent or Firm: Haymond; W. Bradley
An aqueous inkjet ink and an ink set using such ink, the ink comprising as colorant, a Copper Phthalocyanine (CuPc) dye compound having formula II: ##STR1## wherein (x,y,z)=4. |
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DETAILED DESCRIPTION OF THE INVENTION The invention described herein is directed to a cyan ink particularly suitable for use in printing inkjet images using commercially available inkjet printers such as DESKJET.
TM.
printers manufactured by Hewlett-Packard Company of Palo Alto, Calif.
In order to gain improved color chroma in cyan inks, past inks would add or increase the amount of high chroma, low lightfastness dye such as AB9.
Although this approach increases the color in the ink, the lightfastness of the ink system significantly decreases because dyes such as AB9 are extremely poor in light fade resistance.
The present inventors have found a way to increase the light fade resistance by using the more chromatic copper phthalocyanine dye of the present invention.
This is achieved because the copper phthalocyanine dyes of the present invention have more light fade resistance, plus the ink uses less high chroma, low lightfastness dye such as AB9.
The ink of the present invention is also more soluble at the desired pH range for colored inkjet inks, around pH 4.
0, than previous cyan inks.
Increased solubility at pH 4.
0 means ink reliability (decap) is improved over previous cyan inks.
The ink of the present invention also has a longer shelf life than previous cyan inks.
In accelerated ink shelf life testing, the ink of the present invention shows less optical density (OD) loss over time when compared to previous cyan inks.
Consequently, the ink of the present invention and supplies containing the ink can be kept longer without having to dispose of expired materials.
In a general embodiment, the cyan ink of the present invention has high plain paper chroma and good lightfastness in vehicles having pH at most7.
The cyan ink comprises: (a) a Copper Phthalocyanine (CuPc) compound having formula II: ##STR5## wherein .
SIGMA.
(x,y,z)=4; and (b) a medium comprising water or mixtures of water and an organic solvent.
In a preferred embodiment of the above cyan ink, x is from 2.
2 to 3, y is from 0.
3 to 1, and z is from 0
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