Printing ink compositions

Claim 2

A printing ink comprising an organic ink vehicle having dispersed therein an ink coloring material and an organophilic clay gellant comprising the reaction product of (a) a smectite-type clay having a cation exchange capacity of at least 75 milliequivalents per 100 grams of said clay, (b) an organic anion derived from an organic acid having a pK A less than about 11.0, said organic anion being present in the range of from 10 to 50 milliequivalents per 100 grams of clay, 100% active clay basis, and (c) an organic cation selected from the group consisting of: ##STR7## wherein X is nitrogen or phosphorus, Y is sulfur, and wherein R 1 is an alkyl group containing 12 to 22 carbon atoms, and wherein R 2 , R 3 and R 4 are selected from the group consisting of hydrogen, saturated and unsaturated alkyl groups containing 1 to 22 carbon atoms, aryl groups, aralkyl groups containing 1 to 22 carbon atoms on the alkyl chain, hydroxyalkyl groups having 2 to 6 carbon atoms and mixtures thereof, said organic cation being present in a sufficient quantity to at least satisfy the cation exchange capacity of the clay and the cationic activity of the organic anion, wherein an organic cation--organic anion complex is intercalated with the smectite-type clay and the cation exchange sites of the smectite-type clay are substituted with the organic cation.

Claim 3

A process for preparing a printing ink comprising: (1) forming a dispersion of an ink coloring material with an organic ink vehicle; (2) preparing an organophilic clay gellant comprising the reaction product of: (a) a smectite-type clay having a cation exchange capacity of at least 75 milliequivalents per 100 grams of said clay; (b) an organic anion derived from an organic acid having a pK A less than about 11.0, said organic anion being present in the range of from 10 to 50 milliequivalents per 100 grams of clay, 100% active clay basis; and (c) an organic cation selected from the group consisting of: ##STR8## wherein X is nitrogen or phosphorus, Y is sulfur, and wherein R 1 is an alkyl group containing 12 to 22 carbon atoms, and wherein R 2 , R 3 and R 4 are selected from the group consisting of hydrogen, saturated and unsaturated alkyl groups containing 1 to 22 carbon atoms, aryl groups, aralkyl groups containing 1 to 22 carbon atoms on the alkyl chain, hydroxyalkyl groups having 2 to 6 carbon atoms and mixtures thereof, said organic cation being present in a sufficient quantity to at least satisfy the cation exchange capacity of the clay and the cationic activity of the organic anion, wherein an organic cation--organic anion complex is intercalated with the smectite-type clay and the cation exchange sites of the smectite-type clay are substituted with the organic cation; and (3) dispersing said organophilic clay gellant in said dispersion to prepare a viscous printing ink.

Claim 4

A process for preparing a printing ink comprising: (1) forming a dispersion of an ink coloring material with an organic ink vehicle; (2) preparing an organophilic clay gellant comprising the reaction product of: (a) a smectite-type clay having a cation exchange capacity of at least 75 milliequivalents per 100 grams of said clay; (b) an organic anion derived from an organic acid having a pK A less than about 11.0, said organic anion being present in the range of from 10 to 50 milliequivalents per 100 grams of clay, 100% active clay basis; and (c) an organic cation selected from the group consisting of: ##STR8## wherein X is nitrogen or phosphorus, Y is sulfur, and wherein R 1 is an alkyl group containing 12 to 22 carbon atoms, and wherein R 2 , R 3 and R 4 are selected from the group consisting of hydrogen, saturated and unsaturated alkyl groups containing 1 to 22 carbon atoms, aryl groups, aralkyl groups containing 1 to 22 carbon atoms on the alkyl chain, hydroxyalkyl groups having 2 to 6 carbon atoms and mixtures thereof, said organic cation being present in a sufficient quantity to at least satisfy the cation exchange capacity of the clay and the cationic activity of the organic anion, wherein an organic cation--organic anion complex is intercalated with the smectite-type clay and the cation exchange sites of the smectite-type clay are substituted with the organic cation; and (3) dispersing said organophilic clay gellant in said dispersion to prepare a viscous printing ink.

Claim 5

The printing ink of claim 1 wherein the smectite-type clay is selected from the group consisting of hectorite and sodium bentonite.

Claim 6

The printing ink of claim 1 wherein the amount of said organic cation is from 100 to 160 milliequivalents per 100 grams of clay, 100% active clay basis.

Claim 7

The printing ink of claim 1 wherein said organophilic clay gellant comprises from 0.1% to 15% by weight of said printing ink.

Claim 8

The printing ink of claim 1 wherein said organophilic clay gellant comprises from 1.0% to 3.0% by weight of said printing ink.

Claim 9

The proccess of claim 2 wherein said clay is hectorite or sodium bentonite.

Claim 10

The process of claim 2 wherein said organophilic clay gellant comprises from 0.1% to 15% by weight of said printing ink.