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US 6,607,589 B2Granted
Cyan ink formulation
AssigneeHewlett-Packard Development Company, L.P.
InventorsRaymond J Adamic, Richard A Sader, Gary W Byers, Paul J. Bruinsma, Howard A. Doumaux, Kai Kong Iu, Richard Anderson, Hiang P Lauw
Life of this patent
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Abstract
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: wherein (x,y,z)=4.
Claims16
A cyan ink having high plain paper chroma and good lightfastness in vehicles having pH at most 7, said cyan ink comprising:
- (a) a Copper Phthalocyanine (CuPc) dye compound having formula II:
- wherein
- Σ(x,y,z)=4;
- x is from 2.2 to 3, y is from 0.3 to 1, and z is from 0.5 to 1;
- the dye comprises from 0.01 to 30 parts by weight of the cyan ink;
- and the cyan ink has a pH of from about 3 to about 7;
- and
- (b) a medium comprising water or mixtures of water and an organic solvent.
5 more elements
An ink set for ink-jet printing, said ink set comprising:
- at least one yellow ink containing at least one yellow dye;
- at least one magenta ink-containing at least one magenta dye;
- and
- at least one cyan ink comprising
- (a) a Copper Phthalocyanine (CuPc) dye compound having formula II:
- wherein
- Σ(x,y,z)=4;
- x is from 2.2 to 3, y is from 0.3 to 1, and z is from 0.5 to 1;
- the dye comprises from 0.01 to 30 parts by weight of the cyan ink;
- and the cyan ink has a pH of from about 3 to about 7;
- and
- (b) a medium comprising water or mixtures of water and an organic solvent.
9 more elements
Dependencies are inferred from the claim text.