Method for preparing bleed resistant lithographic inks
AssigneeBASF Wyandotte Corporation
InventorManohar L. Arora
Life of this patent
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Abstract
Bleed resistant lithographic ink compositions containing azo red pigments are prepared by mixing a wetting agent such as an amine, an amine oxide, an amide, an amidine, an amidoxime, an oxime, an oxazolidine, or an amino acid with a substantially dry flushed color.
Claims9
A method for imparting bleed resistance to a lithographic printing ink composition containing an azo red pigment and at least one vehicle selected from the class consisting of an alkyd resin, and a urethane-modified alkyd resin, said method comprising mixing a substantially dry flushed dispersion of the ink vehicle and pigment with an effective amount of at least one pigment wetting agent selected from the class consisting of:
- an aliphatic monoamine having from 2 to about 20 carbon atoms;
- an aliphatic polyamine having from 2 to about 36 carbon atoms wherein the ratio of carbon atoms to amino groups is from about 1 to about 18;
- an aliphatic substituted aniline or naphthylamine wherein the aliphatic substituent contains from about 6 to about 20 carbon atoms;
- an amine oxide having the formula ##STR6## wherein R, R.sup.1 and R.sup.2 are aliphatic groups having from 1 to about 20 carbon atoms but wherein the total number of carbon atoms is about 36 or less;
- dehydroabietylamine or tetrahydrobietylamine;
- an amide having the formula ##STR7## wherein R.sup.3 is an aliphatic group having from about 12 to about 20 carbon atoms, R.sup.4 is hydrogen or lower aminoalkyl, and R.sup.5 is a lower aminoalkyl;
- an amidine having from about 12 to about 20 carbon atoms;
- an amidoxime having from about 12 to about 20 carbon atoms;
- an oxime having from about 12 to about 20 carbon atoms;
- an amide having the formula ##STR8## wherein R.sup.6 is an aliphatic group having from about 12 to about 20 carbon atoms and R.sup.7 and R.sup.8 are alkylene groups having from 2 to about 4 carbon atoms, m is from 0 to about 5 and n is from 1 to about 5;
- an oxazolidine having the formula ##STR9## wherein R.sup.9 is a polyacrylate residue having a molecular weight of from about 800 to about 3000;
- an amino acid having the formula
- R.sup.10 --CH(NR.sub.2.sup.11)--(CH.sub.2)p--COOH
- wherein R.sup.10 is an aliphatic group containing from about 12 to about 20 carbon atoms, R.sup.11 may be independently hydrogen, methyl or ethyl, and p is from 0 to about 4;
- an N-acyl amino acid having the formula ##STR10## wherein R.sup.12 is an alkyl group having from about 12 to about 20 carbon atoms and R.sup.13 is an alkyl group having from 1 to about 4 carbon atoms;
- salts of the aforesaid amines, with the proviso that when the wetting agent is an amide, the effective amount is from about 6% to about 9% of the weight of the pigment.
Dependencies are inferred from the claim text.