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 inkjet ink composition includes a colorant, two or more hydrophilic organic solvents, and particles of a polymer containing a structural unit derived from a hydrophilic monomer and a structural unit derived from a hydrophobic monomer. The polymer has a glass transition temperature of 150° C. or higher and an I/O value of from 0.2 to 0.55, and the particles of the polymer have a volume average particle diameter of from 0.1 to 10 nm.

Abstract: A liquid developer includes: a carrier liquid and toner particles dispersed in the carrier liquid, including a binder resin which contains a thermoplastic resin having repeating units derived from a monomer having a styrene skeleton and repeating units derived from a monomer having an acrylic ester structure, and a thermoplastic elastomer resin that is a block copolymer, the block copolymer having a first block portion including repeating units derived from a monomer having a styrene skeleton, a second block portion including repeating units derived from an alkene having 2 to 6 carbon atoms, and a third block portion including repeating units derived from a monomer having a styrene skeleton and these block portions being bonded in this order.

Abstract: An ink-jet recording method is provided. The ink-jet method includes recording an images by ejecting, onto a recording medium by an-inkjet method, a liquid composition containing polymer particles having a glass transition temperature (Tg) higher than the minimum film forming temperature (MFT) at least by 5° C., a hydrophilic organic solvent, a surfactant, and water under ejection conditions satisfying all of the following (1) to (3): (1) Tg>the temperature of the liquid composition at the time of ejection>MFT, (2) MFT>20° C., and (3) the temperature of the liquid composition at the time of ejection is 30° C. or higher.

Abstract: An ink set for inkjet recording is provided. The ink set includes: at least one kind of ink composition that contains self-dispersing polymer particles, a color material, a hydrophilic organic solvent and water; and a reaction liquid capable of forming an aggregate upon contact with the ink composition.

Abstract: An ink composition includes: first particles which are insoluble and dispersed in an aqueous dispersion medium, a polarity of the first particles being one of positive and negative; and second particles which are insoluble and dispersed in the aqueous dispersion medium, the second particles including both a cationic group and an anionic group, the second particles having a zeta potential that changes along with a change in pH of the aqueous dispersion medium, percentage of a water-soluble component in the second particles being not higher than 5% by mass.

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 aqueous colorant dispersion including: a colorant (A); and a polymer (B) including a hydrophobic structural unit (a) having an aromatic ring linked via a linking group to an atom included in a main chain, a hydrophilic structural unit (b) having an ionic group, and a structural unit (c) derived from an aliphatic amine or monocyclic aromatic amine.

Abstract: An aqueous ink composition includes: composite particles; and a colorant, wherein the composite particles are prepared by polymerizing at least one monomer capable of forming a second polymer in the presence of a polymer aqueous dispersion, and the polymer aqueous dispersion is prepared by adding a water-soluble electrolyte selected from an acidic compound or a salt thereof to either a first-polymer solution containing a first polymer and a solvent which dissolves the first polymer, or a first-polymer dispersion obtained from the first-polymer solution and water; and wherein the first polymer includes a hydrophilic structural unit and a hydrophobic structural unit, and at least one of the first polymer or the second polymer has a glass transition temperature of 120° C. or higher.

Abstract: An inkjet ink composition includes a colorant, two or more hydrophilic organic solvents, and particles of a polymer containing a structural unit derived from a hydrophilic monomer and a structural unit derived from a hydrophobic monomer. The polymer has a glass transition temperature of 150° C. or higher and an I/O value of from 0.2 to 0.55, and the particles of the polymer have a volume average particle diameter of from 0.1 to 10 nm.

Abstract: A composition comprising an organic crystal having a minor axis length of from 3 to 100 nm and a major axis length of from 10 to 2,000 nm and a matrix material, wherein the organic crystal satisfies that (1) a surfactant is adsorbed on the organic crystal, (2) an inorganic ion is adsorbed on the organic crystal, (3) silicon oxide, titanium oxide, aluminum oxide, zirconium oxide, barium oxide or hydroxyapatite is bonded with the organic crystal, or (4) the organic crystal is modified with a group represented by the following formula (1): wherein L1 represents —O—, —S—, —CO— or others, n is 0 to 4, and R1 represents an organic group.

Abstract: An ink composition for ink-jet recording, including: coloring particles containing a pigment that is coated with a water-insoluble polymer dispersant, and self-dispersing polymer particles containing a first polymer which includes a constituent unit derived from a hydrophilic monomer and a constituent unit derived from a hydrophobic monomer, and which has a glass transition temperature from 150° C. to 250° C. and an I/O value of from 0.20 to 0.55; an ink set including the ink composition; and an image forming method using the ink set are provided.

Abstract: An ink-jet ink composition comprising: a pigment, a polymer pigment dispersion, polymer particles, a hydrophilic organic solvent, water, and at least one of a water-soluble acidic compound having a molecular weight of 200 or less or a salt thereof in an amount of from 50 ppm to 1,000 ppm; an ink set that includes the ink-jet ink composition and a treatment liquid that forms an aggregate when contacted with the ink-jet ink composition; and an image forming method using the ink set.

Abstract: The invention provides a method for manufacturing a water-based dispersion of a self-dispersing polymer, including: obtaining a copolymer solution including a copolymer having a hydrophilic constituent unit and a hydrophobic constituent unit, and a solvent dissolving that dissolves the copolymer; obtaining a water-based dispersion of the copolymer through dispersion using the copolymer solution and water; and adding a water-soluble electrolyte selected from an acidic compound and the salt thereof to either or both of the copolymer solution and the water-based dispersion, as well as a water-based ink composition including the water-based dispersion, an ink set including the water-based ink composition, and an image forming method using the water-based ink composition or the ink set.

Abstract: The invention provides a water-based ink composition including: a water-based medium, a colored particle containing a pigment and a water-insoluble polymer dispersant, and a self-dispersing polymer particle including a hydrophilic constituent unit, and a hydrophobic constituent unit derived from alicyclic (meth)acrylate, as well as an ink set comprising the water-based ink composition, and an image forming method using the aqueaous ink composition or the ink set.

Abstract: There are provided an ink composition including a coloring material, a hydrophilic organic solvent, polymer particles that have a minimum filming temperature (MFTdisp) of 60° C. or more when dispersed in water and that have a MFT 40° C. or more lower than the MFTdisp when mixed with water and 25 mass % of the hydrophilic organic solvent based on a solid content of the polymer, and water; an ink set including the ink composition and a treating liquid capable of forming an aggregate upon contact with the ink composition; and an ink-jet recording method using the ink composition or the ink set.

Abstract: An ink set for ink jet recording including an ink composition containing a coloring material, and a polymer particle including 65 mass % or more of a constituent unit derived from a methacrylic acid derivative, and a treating liquid which forms an aggregate when contacted with the ink composition, and an ink jet recording method using the same are provided.

Abstract: An ink-jet recording method is provided. The ink-jet method includes recording an images by ejecting, onto a recording medium by an-inkjet method, a liquid composition containing polymer particles having a glass transition temperature (Tg) higher than the minimum film forming temperature (MFT), a hydrophilic organic solvent, a surfactant, and water under ejection conditions satisfying all of the following (1) to (3): (1) Tg>the temperature of the liquid composition at the time of ejection>MFT, (2) MFT>20° C., and (3) the temperature of the liquid composition at the time of ejection is 30° C. or higher.

Abstract: An ink set for inkjet recording is provided. The ink set includes: at least one kind of ink composition that contains self-dispersing polymer particles, a color material, a hydrophilic organic solvent and water; and a reaction liquid capable of forming an aggregate upon contact with the ink composition.