Ink jet printing with inks containing cationic-anionic monomer pairs

A process which comprises (a) incorporating into an ink jet printing apparatus (1) a first ink comprising water and monomeric acrylamide;

• and (2) a second ink comprising water and a multivalent metal nitrate salt, wherein the multivalent metal nitrate salt is selected so that upon contact of the monomeric acrylamide with the multivalent metal nitrate salt, spontaneous polymerization of the monomeric acrylamide occurs, and wherein at least one of the first ink and the second ink further comprises a colorant;
• (b) causing droplets of the first ink to be ejected in an imagewise pattern onto the substrate;
• and (c) causing droplets of the second ink to be ejected in an imagewise pattern onto the substrate;
• wherein the process results in at least some portions of the substrate bearing images formed from both the first ink and the second ink, said portions forming a printed image containing the colorant and a polyacrylamide polymer formed from the monomeric acrylamide.

A process which comprises (a) incorporating into an ink jet printing apparatus (1) a first ink comprising water and monomeric 5-vinyl tetrazole;

• and (2) a second ink comprising water and an amine base, wherein the amine base is selected so that upon contact of the monomeric 5-vinyl tetrazole with the amine base, spontaneous polymerization of the monomeric 5-vinyl tetrazole occurs, and wherein at least one of the first ink and the second ink further comprises a colorant;
• (b) causing droplets of the first ink to be ejected in an imagewise pattern onto the substrate;
• and (c) causing droplets of the second ink to be ejected in an imagewise pattern onto the substrate;
• wherein the process results in at least some portions of the substrate bearing images formed from both the first ink and the second ink, said portions forming a printed image containing the colorant and a polymer formed from the monomeric 5-vinyl tetrazole.