Coating for treating substrates for ink jet printing including imbibing solution for enhanced image visualization and retention
View Patent ↗A method of producing a printed substrate so as to improve the adhesion, colorfastness and washfastness of either reactive or acid dye-based ink jet inks printed onto the substrate, the method includes the steps of providing a substrate, treating the substrate with an aqueous coating formulation comprising a cationic polymer or copolymer, a fabric softener, treating the substrate of step with an imbibing aqueous solution of either urea, and an ingredient selected from sodium bicarbonate, sodium carbonate or combinations thereof, or ammonium sulfate, drying the substrate, printing on the substrate with either an acid or reactive dye-based ink, depending on the coating and post treating the printed substrate.
1. An aqueous coating formulation containing solids, for enhancing image visualization and retention of reactive dye-based inks, consisting essentially of:
a) a cationic homopolymer or copolymer,
b) a cationic or non-ionic fabric softener; and
c) urea; and
d) an ingredient selected from the group consisting of sodium bicarbonate, sodium carbonate and combinations thereof.
2. The aqueous coating formulation of claim 1 wherein said cationic homopolymer or copolymer is present in an amount between about 5 and about 95 weight percent of the total solids.
3. The aqueous coating formulation of claim 1 wherein said fabric softener is present in an amount between about 5 and about 20 weight percent of the total solids.
4. The aqueous coating formulation of claim 1 further consisting essentially of a latex binder.
5. The aqueous coating formulation of claim 4 wherein said latex binder is present in an amount between about 0 and about 80 weight percent of the total solids.
6. The aqueous coating formulation of claim 1 wherein said ingredient is present in an amount between about 3 and 10 weight percent of the total solids.
7. The aqueous coating formulation of claim 1 wherein the urea is present in an amount between about 5 and 12 weight percent of the total solids.
8. The aqueous coating formulation of claim 1 further consisting essentially of an additive selected from the group consisting of wetting agents, defoamers, surfactants and combinations thereof, present in an amount between about 0.1 and 1 weight percent of the total solids.