Ink compositions for thermal ink jet printing

DETAILED DESCRIPTION OF THE INVENTION Inks of the present invention contain an aqueous liquid vehicle, a colorant, 1,4-diazabicyclo?2.
2.
2!octane, and a fluorinated material selected from the group consisting of (a) those of the formula ?(F.
sub.
2n+1 C.
sub.
n CH.
sub.
2 S).
sub.
2 (CH.
sub.
3)C--CH.
sub.
2 CH.
sub.
2 COO.
sup.
- !?B.
sup.
+ !, wherein n is an integer of from about 8 to about 20 and B is a cation, and (b) those of the formula ?(F.
sub.
3 C(F.
sub.
2 C).
sub.
n CH.
dbd.
CHCH.
sub.
2 OCH(OH)CH.
sub.
2).
sub.
2 NCH.
sub.
2 COO.
sup.
- !?X.
sup.
+ !, wherein X is a cation and n is an integer of from about 3 to about 20.
The liquid vehicle can consist solely of water, or it can comprise a mixture of water and a water soluble or water miscible organic component, such as ethylene glycol, propylene glycol, diethylene glycols, glycerine, dipropylene glycols, polyethylene glycols, polypropylene glycols, tripropylene glycol monomethyl ether, amides, ethers, urea, substituted ureas, ethers, carboxylic acids and their salts, esters, alcohols, organosulfides, organosulfoxides, sulfones (such as sulfolane), alcohol derivatives, carbitol, butyl carbitol, cellusolve, ether derivatives, amino alcohols, ketones, N-methylpyrrolidinone, 2-pyrrolidinone, cyclohexylpyrrolidone, hydroxyethers, amides, sulfoxides, lactones, polyelectrolytes, methyl sulfonylethanol, imidazole, and other water soluble or water miscible materials, as well as mixtures thereof.
When mixtures of water and water soluble or miscible organic liquids are selected as the liquid vehicle, the water to organic ratio typically ranges from about 100:0 to about 30:70, and preferably from about 97:3 to about 40:60.
The non-water component of the liquid vehicle generally serves as a humectant which has a boiling point higher than that of water (100.
degree.
C.
).
In the ink compositions of the present invention, the liquid vehicle is typically present in an amount of from about 60 to about 95 percent by weight of the ink, and preferably from about 70 to about 90 percent by weight of the ink, although the amount can be outside these ranges