An ink set includes a first ink composition, and a second ink composition, in which the first ink composition contains a first pigment, and an alkyl diol having carbon atoms of 6 or less and a normal boiling point of 240 C. or more, the second ink composition contains a second pigment, and the alkyl diol, in the first ink composition, a content of the first pigment is 2.5% by .[.weight.]. .Iadd.mass .Iaddend.or more, and a content of the alkyl diol is 3% by .[.weight.]. .Iadd.mass .Iaddend.to 15% by .[.weight.]. .Iadd.mass.Iaddend., in the second ink composition, a content of the second pigment is less than 2.5% by .[.weight.]. .Iadd.mass.Iaddend., and the content of the alkyl diol is 8% by .[.weight.]. .Iadd.mass .Iaddend.to 30% by .[.weight.]. .Iadd.mass.Iaddend., and the content of the alkyl diol in the second ink composition is greater than the content of the alkyl diol in the first ink composition.

An ink set includes a first ink composition, and a second ink composition, in which the first ink composition contains a first pigment, and an alkyl diol having carbon atoms of 6 or less and a normal boiling point of 240 C. or more, the second ink composition contains a second pigment, and the alkyl diol, in the first ink composition, a content of the first pigment is 2.5% by .[.weight.]. .Iadd.mass .Iaddend.or more, and a content of the alkyl diol is 3% by .[.weight.]. .Iadd.mass .Iaddend.to 15% by .[.weight.]. .Iadd.mass.Iaddend., in the second ink composition, a content of the second pigment is less than 2.5% by .[.weight.]. .Iadd.mass.Iaddend., and the content of the alkyl diol is 8% by .[.weight.]. .Iadd.mass .Iaddend.to 30% by .[.weight.]. .Iadd.mass.Iaddend., and the content of the alkyl diol in the second ink composition is greater than the content of the alkyl diol in the first ink composition.

A radiation curable ink jet composition contains an acrylate oligomer (A), a monofunctional monomer (B), and a predetermined monomer (C), in which the acrylate oligomer (A) has 1 to 3 acryloyl groups, the glass transition temperature of a homopolymer of the monofunctional monomer (B) is 20 C. or more and 30 C. or less, and the content of the monofunctional monomer (B) is 40% by mass or more based on the entire radiation curable ink jet composition.

A radiation curable ink jet composition contains an acrylate oligomer (A), a monofunctional monomer (B), and a predetermined monomer (C), in which the acrylate oligomer (A) has 1 to 3 acryloyl groups, the glass transition temperature of a homopolymer of the monofunctional monomer (B) is 20 C. or more and 30 C. or less, and the content of the monofunctional monomer (B) is 40% by mass or more based on the entire radiation curable ink jet composition.

In an example of a method for three-dimensional (3D) printing, a polymeric build material is applied to form a build material layer. A fusing agent is selectively applied, based on a 3D object model, onto the build material layer to form a patterned portion. A hydrophobic agent is selectively applied, based on the 3D object model, onto at least a portion of the patterned portion. The hydrophobic agent includes a lipophilic phase discontinuously dispersed within an aqueous phase by a surfactant, wherein the lipophilic phase includes an organosilane having a central silicon atom coupled to a C6 to C24 aliphatic or alicyclic hydrocarbon and multiple hydrolyzable groups, wherein the organosilane is present in the hydrophobic agent at from about 1 wt % to about 20 wt %. The build material layer is exposed to energy to selectively coalesce the patterned portion and form a 3D object layer having a hydrophobic portion.

In an example of a method for three-dimensional (3D) printing, a polymeric build material is applied to form a build material layer. A fusing agent is selectively applied, based on a 3D object model, onto the build material layer to form a patterned portion. A hydrophobic agent is selectively applied, based on the 3D object model, onto at least a portion of the patterned portion. The hydrophobic agent includes a lipophilic phase discontinuously dispersed within an aqueous phase by a surfactant, wherein the lipophilic phase includes an organosilane having a central silicon atom coupled to a C6 to C24 aliphatic or alicyclic hydrocarbon and multiple hydrolyzable groups, wherein the organosilane is present in the hydrophobic agent at from about 1 wt % to about 20 wt %. The build material layer is exposed to energy to selectively coalesce the patterned portion and form a 3D object layer having a hydrophobic portion.

A pigment printing ink jet ink composition according to one embodiment of the present disclosure includes a self-dispersible black pigment having a specific surface area of 50 m.sup.2/g or more calculated from a measurement by a pulse NMR at 30? C., a metal alkali, a water-soluble organic solvent, and water, and in the ink composition described above, a content of the self-dispersible black pigment with respect to a content of the metal alkali is 13 to 40 in terms of a composition ratio, the water-soluble organic solvent includes a compound having an SP value of 11 or more, and the water-soluble organic solvent includes no compound having an SP value of less than 11 at a content of more than 0.3 percent by mass with respect to a total mass of the ink composition.

A pigment printing ink jet ink composition according to one embodiment of the present disclosure includes a self-dispersible black pigment having a specific surface area of 50 m.sup.2/g or more calculated from a measurement by a pulse NMR at 30? C., a metal alkali, a water-soluble organic solvent, and water, and in the ink composition described above, a content of the self-dispersible black pigment with respect to a content of the metal alkali is 13 to 40 in terms of a composition ratio, the water-soluble organic solvent includes a compound having an SP value of 11 or more, and the water-soluble organic solvent includes no compound having an SP value of less than 11 at a content of more than 0.3 percent by mass with respect to a total mass of the ink composition.

The present disclosure is drawn to an ink composition including an aqueous liquid vehicle, from 2 wt % to 7 wt % self-dispersed pigment dispersed in the aqueous liquid vehicle, and from 0.5 wt % to 5 wt % acidic polymeric binder particles having an acid number from 30 to 200 and a particle size from 1 nm to 100 nm dispersed in the aqueous liquid vehicle. The ink composition can also include from 0.1 wt % to 0.75 wt % monovalent salt solubilized in the aqueous liquid vehicle. The self-dispersed pigment to monovalent salt weight ratio in the ink composition can be from 3:1 to 50:1, for example.

A jet ink composition, a jet ink coating method and a resulting jet ink coated article are all predicated upon the jet ink composition which includes in addition to a particulate pigment material and a solvent composition a resin composition. The resin composition includes an uncured silicone resin, an uncured epoxy resin and an uncured melamine resin. Upon thermal cure the uncured resin composition forms a cured resin composition with superior adhesion to substrates such as but not limited to glass substrates, ceramic substrates and metal oxide substrates.