Abstract: Disclosed is an ink composition for ink jet recording containing water, a pigment, a (meth)acrylamide compound, and a polymer particle made of a polymer composed of a structural unit derived from a methacrylic acid and a structural unit derived from methacrylic acid ester having an SP value of from 19.0 MPa1/2 to 25.0 MPa1/2.

Abstract: An inkjet ink set including: an ink composition including water, a colorant, polymer particles having a glass transition temperature of 90° C. or higher, an organic amine and an inorganic salt; and a treatment liquid that includes an acidic compound and generates aggregation when comes into contact with the ink composition. The inkjet ink set and an image forming method using the same provide preservation stability and secured excellent jetting ability of the ink composition, and an image having image quality with suppressed formation of satellite droplets.

Abstract: An ink jet composition which contains a pigment selected from the group consisting of a self-dispersing pigment and a resin-coated pigment in which at least a portion of a surface of a pigment particle is coated with a water-insoluble resin; at least one selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol and polyethylene glycol, the content of which is from 0.01% by mass to less than 1.00% by mass based on the total mass of the composition; a resin particle that is insoluble or hardly soluble in water; a wax particle that is insoluble or hardly soluble in water; and water.

Abstract: An ink composition is disclosed which includes carbon black; at least one selected from the group consisting of a cyan pigment and a magenta pigment; at least one selected from the group consisting of polyvinyl pyrrolidone, polyvinyl alcohol, and polyethylene glycol, at a ratio of 0.01% by mass or higher but lower than 1.00% by mass, relative to the total amount of the composition; water-insoluble or substantially water-insoluble resin particles, water-insoluble or substantially water-insoluble wax particles or any mixture thereof; and water. An ink set and an image forming method are also disclosed.

Abstract: An ink composition including: initiator particles including a water-insoluble polymerization initiator and a water-soluble polymer and having a volume average particle diameter of 500 nm or less; a water-soluble polymerizable compound; a pigment; and water.

Abstract: An ink set is disclosed which includes a yellow ink composition containing a resin-coated yellow pigment in which a yellow pigment is coated with a crosslinked water-soluble resin, a water-soluble polymerizable compound and water; a magenta ink composition containing a resin-coated magenta pigment in which a magenta pigment is coated with a crosslinked water-soluble resin, a water-soluble polymerizable compound and water; a cyan ink composition containing a resin-coated cyan pigment in which a cyan pigment is coated with a crosslinked water-soluble resin, a water-soluble polymerizable compound and water; and a treatment liquid containing an aggregating agent for aggregating components in the ink compositions.

Abstract: An ink composition includes: a pigment; water; a polymerizable monomer that is capable of being polymerized by an active energy ray; and an initiator that is capable of initiating polymerization of the polymerizable monomer by the active energy ray, wherein a number of particles contained in the ink composition having a particle diameter of 0.8 ?m or more is 20,000 particles/?l or less.

Abstract: An image forming method including applying a treatment liquid; and applying a first ink containing a pigment, water, and polymer particles of with the content is 1.0 mass % to 3.0 mass %, and applying a second ink having a different hue to the first ink onto the applied first ink at an ink droplet speed of 6 m/sec to 10 m/sec to form a multi-color image, in which an interval from a landing time point of the first ink to a landing time point of the second ink is 200 msec or less, and a dot diameter ?2 of the second ink, and a dot diameter ?1 of the second ink in an ink droplet amount equal to an ink droplet amount in the forming of the multi-color image satisfy a relationship of 0.90??2/?1?1.10.

Abstract: An ink jet composition which contains a pigment selected from the group consisting of a self-dispersing pigment and a resin-coated pigment in which at least a portion of a surface of a pigment particle is coated with a water-insoluble resin; at least one selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol and polyethylene glycol, the content of which is from 0.01% by mass to less than 1.00% by mass based on the total mass of the composition; a resin particle that is insoluble or hardly soluble in water; a wax particle that is insoluble or hardly soluble in water; and water.

Abstract: An aqueous ink composition including: a water-soluble polymerizable compound containing two or more polymerizable functional groups each selected from the group consisting of a (meth)acrylamide group, a maleimide group, a vinyl sulfone group, and an N-vinyl amide group, wherein a ratio of a molecular weight of the compound relative to a number of the polymerizable functional groups contained in a single molecule of the compound is 175 or less; a polymerization initiator; and water.

Abstract: An ink composition including colored particles is disclosed. The colored particles includes a resin dispersant including at least one radically polymerizable group and at least one aromatic partial structure derived from a compound selected from the group consisting of an aromatic hydrocarbon compound, a condensed ring aromatic hydrocarbon compound, an aromatic heterocyclic compound, a condensed ring aromatic heterocyclic compound, and a compound having two or more aromatic hydrocarbon compounds linked to each other; and a colorant.

Abstract: The invention provides an aqueous ink composition including (A) a colorant, (B) a polymer including a hydrophobic structural unit represented by Formula (1) below, (C) a polymerization initiator, (D) a polymerizable compound including an ethylenically unsaturated bond, and (E) water.

Abstract: An ink composition for ink-jet recording includes a pigment; resin particles having a glass transition temperature of 80° C. or higher; at least one water-soluble organic solvent; and water, and a total mass of solid content in the ink composition for ink-jet recording is 10% by mass or more relative to the ink composition for ink-jet recording, and the at least one water-soluble organic solvent includes at least one organic solvent having an SP value of 27.5 or lower, the amount of the at least one organic solvent having an SP value of 27.5 or lower being 70% by mass or more relative to a total amount of the at least one water-soluble organic solvent. An ink-jet recording method is also provided.

Abstract: The present invention provides an ink set including an ink composition including resin particles including a polymer formed from one or more structural units selected from structural units, which are represented by the following Formula (1) and are derived from a polymerizable compound having an SP value of from 8.80 (cal/cm3)1/2 to 14.00 (cal/cm3)1/2, and one or more structural units selected from the group consisting of structural units having an acidic group and structural units having a salt of an acidic group, a polymerizable compound having a (meth)acrylamido structure, water, a pigment, and a polymerization initiator; and a maintenance liquid including a compound having an SP value of from 8.00 (cal/cm3)1/2 to 12.00 (cal/cm3)1/2.

Abstract: The present invention provides an inkjet ink composition, which has excellent ink-ejection reliability over a long time and capability of forming an image without defects such as white spots, and which includes: a pigment coated with a dispersant polymer; a water soluble polymerizable compound; a polymerization initiator; and water, the dispersant polymer being formed from a water soluble dispersant by crosslinking with a crosslinking agent.

Abstract: An ink composition including: initiator particles including a water-insoluble polymerization initiator and a water-soluble polymer and having a volume average particle diameter of 500 nm or less; a water-soluble polymerizable compound; a pigment; and water.

Abstract: The invention provides an ink composition including a pigment, water, a polymerizable compound having an acrylamide structure, a polymerization initiator and a wetting agent that is in the form of a solid at a temperature of 25° C. and an atmospheric pressure of 1 bar, the wetting agent being included in the ink composition in an amount of from 0.01% by mass to 400% by mass with respect to the polymerizable compound having an acrylamide structure.

Abstract: The invention provides an aqueous ink composition including: a) a water-based medium; b) a compound having an ethylenically unsaturated bond; and c) resin particles including a water-insoluble vinyl polymer and a water-insoluble photoinitiator.

Abstract: An aqueous ink composition including a colorant, a polymer including a hydrophobic structural unit (a) represented by the following formula (1), a polymerization initiator, a polymerizable compound including an ethylenically unsaturated bond, and water: wherein, in formula (1), R1 represents a hydrogen atom, a methyl group or a halogen atom; L1 represents —COO—, —OCO—, —CONR2—, —O—, or a substituted or unsubstituted phenylene group; R2 represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; L2 represents a single bond or a divalent linking group having 1 to 30 carbon atoms; and R3 represents a hydrogen atom, a hydroxy group, an alkyl group, an alkyloxy group, an aryl group, an arylalkyl group, an aryloxy group, an acyl group, a halogen atom, a cyano group, or a nitro group.

Abstract: An ink composition is disclosed which includes carbon black; at least one selected from the group consisting of a cyan pigment and a magenta pigment; at least one selected from the group consisting of polyvinyl pyrrolidone, polyvinyl alcohol, and polyethylene glycol, at a ratio of 0.01% by mass or higher but lower than 1.00% by mass, relative to the total amount of the composition; water-insoluble or substantially water-insoluble resin particles, water-insoluble or substantially water-insoluble wax particles or any mixture thereof; and water. An ink set and an image forming method are also disclosed.