The present disclosure describes ink compositions having a polyurethane binder. In one example, an ink composition can include water, an organic co-solvent, a colorant, and a polyurethane binder. The polyurethane binder can include polymerized prepolymer segments including a polymerized diisocyanate and a polymerized polyol, wherein the prepolymer segments terminate in isocyanate groups. The polyurethane binder can also include polymerized chain extenders connecting the polymerized prepolymer segments. The polymerized chain extenders can include a polymerized siloxane-containing diamine and a polymerized acid-containing diamine.

A textile printing system include an ink composition and a fabric substrate. The ink composition includes from 50 wt % to 95 wt % water, from 4 wt % to 49 wt % organic co-solvent, from 0.5 wt % to 12 wt % pigment with a dispersant associated with a surface thereof, and from 0.5 wt % to 20 wt % of a polyurethane particles. The polyurethane particles include a polyurethane strand with a polyurethane backbone with a pendant reactive (meth)acrylate-containing diol group and terminal end cap groups. The terminal end cap groups independently are selected from a monoalcohol, a monoamine, an acrylate, a methacrylate, or a combination thereof.

A textile printing system includes a fabric substrate, an inkjet printhead in fluid communication with a reservoir containing a UV-curable ink composition to eject a UV-curable ink composition, and a UV-curing energy source positioned to cure the UV-curable ink composition upon being ejected onto the fabric substrate. The UV-curable ink composition includes from 50 wt % to 95 wt % water, from 4 wt % to 49 wt % organic co-solvent, from 0.5 wt % to 12 wt % pigment, wherein the pigment has a dispersant associated with a surface thereof, and from 0.5 wt % to 20 wt % of a polyurethane particles. The polyurethane particles include a polyurethane strand including a polyurethane backbone with a pendant reactive (meth)acrylate-containing diol group and terminal end cap groups, and the terminal end cap groups are independently selected from a monoalcohol, a monoamine, an acrylate, a methacrylate, or a combination thereof, for example.

A fluid set can include an ink composition and a fixer composition. The ink composition can include an ink vehicle, pigment, and from 2 wt % to 15 wt % polyurethane binder The fixer composition can include a fixer vehicle, from 1 wt % to 10 wt % quaternary amine-containing polymer, and from 0.5 wt % to 8 wt % blocked nonionic polyisocyanate crosslinking agent.

A fluid set can include an ink composition including an ink vehicle, pigment, and from 2 wt % to 15 wt % acrylic latex binder. The fluid set can also include a fixer fluid including a fixer vehicle, and from 0.5 wt % to 12 wt % of a cationic fixing agent including an azetidinium-containing polyamine.

A method of internal recirculation printing can include introducing an ink composition into a firing chamber, the ink composition comprising water, organic co-solvent, pigment, and from 2 wt % to 20 wt % of a dispersed polymer binder with an acid number from 0 mg KOH/g to 45 mg KOH/g, a weight average molecular weight of 40,000 Mw to 2,000,000 Mw, and a particle size from 40 nm to 2 μm. The method can further include internally recirculating ink composition from the firing chamber, through micro-recirculation fluidics, and back into the firing chamber to be again recirculated or ejected from the firing chamber, as well as ejecting ink composition from the firing chamber through a jetting nozzle onto a substrate.

A fluid set includes a pre-treatment composition, an ink composition, and an overcoat composition. The pre-treatment composition includes a multivalent metal salt and an aqueous vehicle. The ink composition includes a pigment, a polyurethane-based binder, and an aqueous ink vehicle. An overcoat composition includes a blocked polyisocyanate crosslinker and an aqueous overcoat vehicle.

An example of an inkjet ink for textile printing includes a polycarbodiimide, a pigment, a sulfonated polyester-polyurethane binder, and a liquid vehicle. Examples of the inkjet ink may be used in textile printing kits and printing methods with a textile fabric. Examples of the textile fabric may be selected from the group consisting of cotton, polyester, nylon, and silk.

Provided are a dyeing composition which contains an azo coloring agent represented by Formula 1 or 2, a dyed product which is obtained by being dyed with the dyeing composition, and a novel azo coloring agent. In Formulae 1 and 2, C.sup.1 represents a heteroaromatic group, A.sup.1 and B.sup.1 each independently represent a heteroaromatic group, an aromatic group, or a group having a methine structure, and at least one of A.sup.1 or B.sup.1 represents a heteroaromatic group, D.sup.1 represents an anthraquinonyl group, and E.sup.1 represents a heteroaromatic group, an aromatic group, or a group having a methine structure.

A.sup.1-NNC.sup.1NNB.sup.1Formula 1

D.sup.1-NN-E.sup.1Formula 2

The present invention relates to a method of colouring polymer substrates at low temperatures. The method comprises subjecting the polymer substrate that is to be coloured to a colouring liquor comprising a solvent in which the colourant has a high solubility and then adding a solvent in which the colourant has a low solubility, typically water.