The present invention relates to a pigment water dispersion containing a pigment, a crosslinked polymer and water, in which the crosslinked polymer is prepared by crosslinking a carboxy group-containing polymer with a crosslinking agent, and has an acid value of not less than 70 mgKOH/g and not more than 300 mgKOH/g; and the pigment water dispersion further contains a formaldehyde-releasing compound. The pigment water dispersion of the present invention is excellent in storage stability even when being stored under high-temperature conditions for a long period of time.

An ultraviolet curable black ink composition, a bezel pattern forming method using the same, a bezel pattern produced by the method, and a display substrate comprising the bezel pattern are disclosed herein. In some embodiments, an ultraviolet curable ink composition comprises a black pigment, a dispersant, an epoxy compound, an oxetane compound, a light diffusing agent, a photopolymerization initiator, and an organic solvent. The ultraviolet curable black ink composition is developed to be applied to a cover window film of a foldable display, has excellent light shielding properties and folding properties at a thin thickness, and as a light diffusing agent is applied to the ink, prevents surface wrinkles from generating due to a difference in the curing rate of the upper and lower portions of a bezel, by means of UV curing alone without a pretreatment process.

An active-energy-ray-curable composition, which satisfies the following relationships of absorbance: a ratio of absorbance at a wavelength of 400 nm to absorbance at a wavelength of 750 nm is 1.4 or more but 1.6 or less; and a ratio of absorbance at a wavelength of 365 nm to absorbance at a wavelength of 500 nm is 1.2 or less.

An active-energy-ray-curable composition, which satisfies the following relationships of absorbance: a ratio of absorbance at a wavelength of 400 nm to absorbance at a wavelength of 750 nm is 1.4 or more but 1.6 or less; and a ratio of absorbance at a wavelength of 365 nm to absorbance at a wavelength of 500 nm is 1.2 or less.

The present invention relates to an ink-jet printing method using an apparatus including a printing means for ejecting a black ink to a printing substrate to print characters or images on the printing substrate, and a drying means disposed on a downstream side of a transportation direction of the printing substrate, in which the printing substrate is a label printing substrate; the black ink is a water-based composite black ink; the water-based composite black ink contains a composite black pigment containing carbon black, and a content of the carbon black in the composite black pigment is not more than 25% by mass; and the drying means is an infrared heater for heating the water-based composite black ink ejected onto the printing substrate to a temperature of not lower than 95 C. and not higher than 125 C. According to the ink-jet printing method of the present invention, it is possible to obtain a good printed material that is free of color migration or deformation of a printing substrate even when printed on a label printing substrate.

An ink jet textile printing ink contains 5% by mass to 20% by mass of a water-soluble dye, water, a water-soluble organic solvent, and active carbon particles. The active carbon particles include particles having a particle size of 50 nm to 1000 nm, and the active carbon particles having the particle size of 50 nm to 1000 nm are contained in a proportion of 500 to 300000 particles per milliliter. Also, the active carbon particles may include particles having a particle size of 50 nm to 200 nm, and the active carbon particles having a particle size of 50 nm to 200 nm may be contained in a proportion of 2000 to 30000 particles per milliliter. The active carbon particles may have an average particle size in the range of 100 nm to 600 nm.

An ink jet textile printing ink contains 5% by mass to 20% by mass of a water-soluble dye, water, a water-soluble organic solvent, and active carbon particles. The active carbon particles include particles having a particle size of 50 nm to 1000 nm, and the active carbon particles having the particle size of 50 nm to 1000 nm are contained in a proportion of 500 to 300000 particles per milliliter. Also, the active carbon particles may include particles having a particle size of 50 nm to 200 nm, and the active carbon particles having a particle size of 50 nm to 200 nm may be contained in a proportion of 2000 to 30000 particles per milliliter. The active carbon particles may have an average particle size in the range of 100 nm to 600 nm.

An ink jet recording ink set of this invention is an ink jet recording ink set containing a dye ink and a pigment ink, in which the dye ink contains a dye in a proportion of 1.4% by mass or more and 5.0% by mass or less based on the total mass of the ink, the pigment ink contains a pigment in a proportion of 4.0% by mass or more and 8.0% by mass or less based on the total mass of the ink, and, when the volume average particle diameter of the pigment ink is defined as 1 and the volume average particle diameter of a mixed liquid in which the dye ink and the pigment ink are mixed in equal amounts in terms of the mass ratio is defined as 2, the following expression (1) is satisfied,
1.002/11.40(1).

An ink jet recording ink set of this invention is an ink jet recording ink set containing a dye ink and a pigment ink, in which the dye ink contains a dye in a proportion of 1.4% by mass or more and 5.0% by mass or less based on the total mass of the ink, the pigment ink contains a pigment in a proportion of 4.0% by mass or more and 8.0% by mass or less based on the total mass of the ink, and, when the volume average particle diameter of the pigment ink is defined as 1 and the volume average particle diameter of a mixed liquid in which the dye ink and the pigment ink are mixed in equal amounts in terms of the mass ratio is defined as 2, the following expression (1) is satisfied,
1.002/11.40(1).

An aqueous ink jet ink composition is for use in an ink jet recording method. The method includes ejecting ink from an ink jet head including nozzles. The nozzles are configured such that a shape of a side wall surface is a scalloped shape in which a scallop width S1 and a notch depth S2 satisfy S1/S24. The aqueous ink jet ink composition includes a pigment and a solvent that contains a specific compound.