Ink-jet recording ink, image forming method, ink-jet recording apparatus and imaged article
View Patent ↗An ink-jet recording ink contains at least a colorant, a moisturizer, water and a water-soluble substance capable of undergoing polycondensation along with vaporization of the water, in which the colorant is a chelate azo dye.
1. An ink-jet recording ink comprising:
a colorant;
a moisturizer;
water;
a water-soluble substance capable of undergoing polycondensation along with vaporization of the water; and
a pH buffer;
wherein the pH buffer comprises at least one member selected from the group consisting of N,N-bis(2-hydroxyethyl) glycine, N-cyclohexyl-3-aminopropanesulfonic acid, N-cyclohexyl-2-hydroxy-3-aminopropanesulfonic acid, N-cyclohexyl-2-aminoethanesulfonic acid, N-tris (hydroxymethyl)methyl-3-aminopropanesulfonic acid and N-[tris (hydroxymethyl) methyl] glycine.
2. The ink-jet recording ink according to claim 1 , which has a pH of 8.0 to 11.0.
3. The ink-jet recording ink according to claim 1 , wherein the water-soluble substance is at least one organosilicon compound.
4. The ink-jet recording ink according to claim 1 , further comprising a polycondensation promoter capable of accelerating the polycondensation of the water-soluble substance.
5. The ink-jet recording ink according to claim 4 , wherein the polycondensation promoter is at least one of inorganic ammonium salts and organic ammonium salts.
6. The ink-jet recording ink according to claim 5 , wherein the ammonium salts are salts of weak acids.
7. The ink-jet recording ink according to claim 5 , wherein the ammonium salts are salts of strong acids.