AQUEOUS INKJET INKS CONTAINING A POLYURETHANE POLYMER
The present disclosure pertains to an aqueous inkjet ink containing a pigment as colorant, a polymeric dispersant, a polyurethane binder, and an aqueous vehicle. The inks show improved properties for printing on low and non-absorption substrates.
1 . An aqueous inkjet ink comprising an aqueous vehicle, a pigment, and a polyurethane binder; wherein the pigment is stabilized by a polymeric dispersant selected from the group consisting of polyurethane polymer, acrylic polymer, hydrolyzed styrene maleic anhydride copolymer, and mixtures thereof; the polyurethane binder comprising units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized carboxyl group, a third polydiol or a diamine with an alkaline neutralized sulfonic acid group, and at least one triol and/or one polyamine, or mixtures thereof; and wherein the aqueous vehicle comprising one or more water soluble organic solvents with boiling points lower than 230° C. at ambient atmospheric pressure.
2 . The aqueous inkjet ink of claim 1 , wherein the polymeric dispersant is polyurethane polymer.
3 . The aqueous inkjet ink of claim 2 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a third polydiol with an alkaline neutralized sulfonic acid group, and at least one triol.
4 . The aqueous inkjet ink of claim 3 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a third polydiol with an alkaline neutralized sulfonic acid group, and at least one polyamine.
5 . The aqueous inkjet ink of claim 2 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a diamine with an alkaline neutralized sulfonic acid group, and at least one triol and one polyamine.
6 . The aqueous inkjet ink of claim 1 , wherein the polymeric dispersant is acrylic polymer.
7 . The aqueous inkjet ink of claim 6 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a third polydiol with an alkaline neutralized sulfonic acid group, and at least one triol.
8 . The aqueous inkjet ink of claim 6 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a third polydiol with an alkaline neutralized sulfonic acid group, and at least one polyamine.
9 . The aqueous inkjet ink of claim 6 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a diamine with an alkaline neutralized sulfonic acid group, and at least one triol and one polyamine.
10 . The aqueous inkjet ink of claim 1 , wherein the polymeric dispersant is styrene maleic anhydride.
11 . The aqueous inkjet ink of claim 10 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a third polydiol with an alkaline neutralized sulfonic acid group, and at least one triol.
12 . The aqueous inkjet ink of claim 10 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a third polydiol with an alkaline neutralized sulfonic acid group, and at least one polyamine.
13 . The aqueous inkjet ink of claim 10 , wherein the polyurethane binder contains units derived from a diisocyanate, a first polydiol with OH number from 28 to 800, a second polydiol with a tertiary amine neutralized COOH group, a diamine with an alkaline neutralized sulfonic acid group, and at least one triol and one polyamine.