A liquid photosensitive ink composition capable of forming a cured product with a high refractive index and applicable to an inkjet method even though the photosensitive ink composition does not include the solvent, or include small amount of the solvent, a cured product of the photosensitive ink composition, a display panel having a film consisting of the cured product, and a method for producing the cured product using the above photosensitive ink composition. In a photosensitive ink composition including a photopolymerizable compound, metal compound particles, and a photopolymerization initiator, a sulfide compound having specific structure and a (meth)acrylate compound having specific structure as the photopolymerizable compound, and at least one selected from the group consisting of titanium oxide particles, barium titanate particles, cerium oxide particles, and zinc sulfide particles, as the metal compound particles are used.

An aqueous inkjet printing ink composition that is cured by the following radiation rays (1) includes: an acylphosphine oxide-based compound as a photopolymerization initiator of 3 to 10% by mass; a monofunctional water-soluble monomer of 30 to 50% by mass; a multifunctional water-soluble monomer of 10 to 30% by mass; and a pigment based on the whole ink composition, wherein the radiation rays (1) are radiation rays that contain a wavelength of 800 nm and a wavelength of 385 nm and have an irradiation intensity of 100 mW/cm.sup.2 or less at a wavelength of 385 nm. The aqueous inkjet printing ink composition can be cured by specific radiation rays and does not change color of the ink composition in an exemplary embodiment.

An aqueous inkjet printing ink composition that is cured by the following radiation rays (1) includes: an acylphosphine oxide-based compound as a photopolymerization initiator of 3 to 10% by mass; a monofunctional water-soluble monomer of 30 to 50% by mass; a multifunctional water-soluble monomer of 10 to 30% by mass; and a pigment based on the whole ink composition, wherein the radiation rays (1) are radiation rays that contain a wavelength of 800 nm and a wavelength of 385 nm and have an irradiation intensity of 100 mW/cm.sup.2 or less at a wavelength of 385 nm. The aqueous inkjet printing ink composition can be cured by specific radiation rays and does not change color of the ink composition in an exemplary embodiment.

An active energy ray-curable ink including a radical polymerizable monomer, a radical polymerization initiator, a pigment, a pigment dispersing resin, an organic onium salt, and a radical polymerization inhibitor, wherein the content of the radical polymerization inhibitor is 0.05% to 5.0% by mass of the total amount of the active energy ray-curable ink and an image recording method.

An active energy ray-curable ink including a radical polymerizable monomer, a radical polymerization initiator, a pigment, a pigment dispersing resin, an organic onium salt, and a radical polymerization inhibitor, wherein the content of the radical polymerization inhibitor is 0.05% to 5.0% by mass of the total amount of the active energy ray-curable ink and an image recording method.

The disclosure relates to a powdery filament composition for 3D printing, a 3D printer, and a method of additively manufacturing an object by the 3D printer, and more particularly to a powdery filament composition for 3D printing, which is suitable for home use because it does not produce toxic substances, a 3D printer, the size of which is suitable for home use because it does not require high power energy, high-temperature processing and the like conditions for additive manufacturing, and a method of additively manufacturing an object by the 3D printer.

An ink set according to the present disclosure includes: a treatment liquid containing an aggregating agent; a deep ink composition; and a light ink composition, the ink compositions containing colorants, belonging to the same color system, and each being a water-based ink jet ink, the light ink composition contains an organic solvent which is a condensate of an alkanediol having 2 or 3 carbon atoms and which has two hydroxy groups, and the deep ink composition contains an organic solvent which is an alkanediol having 2 to 4 carbon atoms.

An ink set according to the present disclosure includes: a treatment liquid containing an aggregating agent; a deep ink composition; and a light ink composition, the ink compositions containing colorants, belonging to the same color system, and each being a water-based ink jet ink, the light ink composition contains an organic solvent which is a condensate of an alkanediol having 2 or 3 carbon atoms and which has two hydroxy groups, and the deep ink composition contains an organic solvent which is an alkanediol having 2 to 4 carbon atoms.

A recording method includes: a white ink attachment step of ejecting a white ink composition containing a white coloring material from a white ink jet head and attaching the white ink composition to a recording medium; a non-white ink attachment step of ejecting a non-white ink composition containing a non-white coloring material from a non-white ink jet head and attaching the non-white ink composition to the recording medium; and a primary drying step of heating the white ink composition and the non-white ink composition attached to the recording medium by a drying mechanism. In the white ink attachment step and the non-white ink attachment step, a layer containing the white ink composition and the non-white ink composition is formed by performing main scanning multiple times, in which the ink compositions are ejected and attached to the recording medium, and by attaching the white ink composition and the non-white ink composition to the same scanning region in the recording medium by the same main scanning, while moving a position of an ink jet head relative to the recording medium.

A yellow ink for ink jet and an image recording method, which enable recording of a yellow image having excellent weather fastness, and an image recorded article provided with a yellow image having excellent weather fastness are provided. A yellow ink for ink jet contains a lake yellow pigment and a yellow pigment other than the lake yellow pigment, a resin, a water-soluble organic solvent, and water.