Method for preparing bleed resistant lithographic inks

Claim 1

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 1 and R 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 3 is an aliphatic group having from about 12 to about 20 carbon atoms, R 4 is hydrogen or lower aminoalkyl, and R 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 6 is an aliphatic group having from about 12 to about 20 carbon atoms and R 7 and R 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 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 10 is an aliphatic group containing from about 12 to about 20 carbon atoms, R 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 12 is an alkyl group having from about 12 to about 20 carbon atoms and R 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.

Claim 2

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 1 and R 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 3 is an aliphatic group having from about 12 to about 20 carbon atoms, R 4 is hydrogen or lower aminoalkyl, and R 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 6 is an aliphatic group having from about 12 to about 20 carbon atoms and R 7 and R 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 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 10 is an aliphatic group containing from about 12 to about 20 carbon atoms, R 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 12 is an alkyl group having from about 12 to about 20 carbon atoms and R 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.