DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention pertains to an ink composition having at least 0.
1 percent, based on weight of ink composition, of a pH-stabilizing additive therein, the additive most preferably being an oil-soluble salt.
The oil-soluble salt acts as a buffer to stabilize the pH of the ink and fountain solution with which the ink is combined.
The oil-soluble salt is produced by combining a primary, secondary, tertiary, or quaternary amine with a polybasic organic acid.
The oil-soluble amine is combined with the acid in a molar ratio of between 1:1 and 2:1.
Preferably the molar ratio of the amine-to-acid is approximately 1:1.
Suitable amines are believed to include aliphatic oil-soluble monoamines which are primary, secondary, tertiary, or quaternary amines of which the carbon chain may be saturated or unsaturated, branched or straight.
Examples of such amines include octylamine, N,N-diethyl propylamine, decylamine, n-dodecylamine, tetradecyl amine, n-octadecyl amine, cocoamine, dicocoamine, dimethylcocoamine, methyl dicocoamine, cocotrimethyl ammonium chloride, dicocodimethyl ammonium chloride, tallow amine, dimethyl tallow amine, tallow trimethyl amine, hydrogenated tallow amine, dihydrogenated tallow amine, dimethylhydrogenated tallow amine, methyl dihydrogenated tallow amine, dihydrogenated tallow dimethyl ammonium chloride, oleylamine, dimethyl oleylamine, soyaamine, dimethyl soyaamine, disoyaamine, soyatrimethyl ammonium chloride, stearyl trimethyl ammonium chloride, lauryl trimethyl ammonium chloride and cetyl trimethyl ammonium chloride.
Preferred amines are believed to be cocotrimethyl ammonium chloride, dicocodimethyl ammonium chloride, dihydrogenated tallow dimethyl ammonium chloride, stearyl trimethyl ammonium chloride, lauryl trimethylammonium chloride and cetyl trimethyl ammonium chloride.
The most preferred amine is dihydrogenated tallow dimethyl ammonium chloride.
The polybasic organic acid has at least 2 carbonyl groups thereon.
Suitable polybasic acids are believed to include dibasic water-soluble organic acids such as oxalic, malonic, succinic, glutaric, adipic, pimelic, maleic, malic, tartaric, and citric
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