Patent ID: 7887627
Filing Date: 2011-02-15
Classification: C09B,C09D

Abstract:
1. A dye-based black ink formulation, comprising: a black dye, wherein the black dye is in an amount from about 0.5 to 5.0 weight percent of the dye-based black ink formulation; a yellow dye, wherein the yellow dye is in an amount from about 0.1 to 4.0 weight percent of the dye-based black ink formulation; a magenta dye, wherein the magenta dye is in an amount from about 0 to 3.5 weight percent of the dye-based black ink formulation; and a cyan dye, wherein the cyan dye is in an amount from about 0 to 4.0 weight percent of the dye-based black ink formulation wherein the black dye is selected from the group consisting of 1H-Pyrazole-3-carboxylic acid, 4-[[6-[[4-[(1,5-disulfo-2-naphthalenyl)azo]-2-methoxy-5-methylphenyl]azo]-5-hydroxy-7-sulfo-2-naphthalenyl]azo]-4,5-dihydro-5-oxo-1-(4-sulfophenyl)-, lithium sodium salt; 2,7-Naphthalenedisulfonic acid, 3-[[4-[[4-[[5-(aminocarbonyl)-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridinyl]azo]-2-sulfophenyl]azo]-2,5-bis(2-hydroxyethoxy)phenyl]azo]-4,5-dihydroxy-, potassium sodium salt; Cuprate(4-), [2-(amino-κN)ethanol][7-[[3-(hydroxy-κO)-4-[[1-(hydroxy-κO)-3-sulfo-7-[(2-sulfoethyl)amino]-2-naphthalenyl]azo-κN1]phenyl]azo]-1,3-naphthalenedisulfonato(6-)]-, tetrasodium (9Cl); 2,7-Naphthalenedisulfonic acid, 6-amino-4-hydroxy-3-[[7-sulfo-4-[(4-sulfophenyl)azo]-1-naphthalenyl]azo]-, tetrasodium salt (7Cl); 1,3-Benzenedicarboxylic acid, 5-[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-6-sulfo-1-naphthalenyl]azo]-, tetraammonium salt (9Cl); and combinations thereof; and compounds defined by formula 1 or formula 2: wherein X is SO wherein R