Provided are an ink composition including water, particles including a polymer having at least one selected from the group consisting of a urethane group and a urea group, and a gelling agent having a hydrogen-bonding group; a method for producing the ink composition; and an image-forming method.

Provided are an ink composition including water, particles including a polymer having at least one selected from the group consisting of a urethane group and a urea group, and a gelling agent having a hydrogen-bonding group; a method for producing the ink composition; and an image-forming method.

An erasable ink set includes: an erasable ink; and an erasing time adjuster which is stored separately from the erasable ink and is capable of adjusting an erasing time of the erasable ink. The erasable ink includes a color developing agent including a pH indicator, water, and at least one selected from the group consisting of a first water-soluble organic solvent and a first surfactant. The erasing time adjuster includes water and at least one selected from the group consisting of a second water-soluble organic solvent and a second surfactant.

An erasable ink set includes: an erasable ink; and an erasing time adjuster which is stored separately from the erasable ink and is capable of adjusting an erasing time of the erasable ink. The erasable ink includes a color developing agent including a pH indicator, water, and at least one selected from the group consisting of a first water-soluble organic solvent and a first surfactant. The erasing time adjuster includes water and at least one selected from the group consisting of a second water-soluble organic solvent and a second surfactant.

An aqueous composition can be used for pre-treating a substrate prior to inkjet printing to provide a white opaque background for inkjet-printed images. This aqueous composition includes: (a) one or more water-soluble salts of a multivalent metal cation at 5-30 weight %; (b) a nonionic or cationic water-soluble or water-dispersible polymeric binder material at 5-30 weight %; and (c) surface-treated visible light-scattering particles having a D.sub.50 (median) particle size of at least 0.04 μm and up to and including 2 μm in an amount of 5-60 weight % based on the total aqueous composition weight. The pre-treated substrate is useful as an inkjet receiving medium that can be readily inkjet-printed particularly with anionically-stabilized aqueous pigment-based inks.

A liquid discharge apparatus includes: an ink composition containing a resin in an amount of 6.0% by mass or more; a liquid discharge unit configured to discharge the ink composition from a nozzle formed in a nozzle surface; and a wiping unit configured to wipe the nozzle surface. The wiping unit includes a wiping member including protrusion-shape fibers. Each of the protrusion-shape fibers has a protruded portion in a cross-section orthogonal to a fiber axis thereof. The protruded portion is continuous in a direction along the fiber axis.

A liquid discharge apparatus includes: an ink composition containing a resin in an amount of 6.0% by mass or more; a liquid discharge unit configured to discharge the ink composition from a nozzle formed in a nozzle surface; and a wiping unit configured to wipe the nozzle surface. The wiping unit includes a wiping member including protrusion-shape fibers. Each of the protrusion-shape fibers has a protruded portion in a cross-section orthogonal to a fiber axis thereof. The protruded portion is continuous in a direction along the fiber axis.

Fusing nanowire inks are described that can also comprise a hydrophilic polymer binder, such as a cellulose based binder. The fusing nanowire inks can be deposited onto a substrate surface and dried to drive the fusing process. Transparent conductive films can be formed with desirable properties.

Fusing nanowire inks are described that can also comprise a hydrophilic polymer binder, such as a cellulose based binder. The fusing nanowire inks can be deposited onto a substrate surface and dried to drive the fusing process. Transparent conductive films can be formed with desirable properties.

There are provided a dispersion composition containing: (A) from 85 to 99.89% by weight of a dispersant (except for the following (B) and (C)); (B) from 0.01 to 5% by weight of an acetylene glycol and/or an acetylene glycol ethoxylate; and (C) from 0.1 to 10% by weight of one or two or more types selected from polyoxy (ethylene-propylene) block polymers having a weight average molecular weight of from 1,500 to 20,000, a content of ethylene oxide of from 20 to 90% by weight, and a content of propylene oxide of from 10 to 80% by weight: a dispersion and an ink composition using the same, and a method of producing the same.