Abstract: An aqueous inkjet recording ink including at least a resin (A), a pigment (B) dispersed with the resin (A), a resin emulsion (C), and an aqueous liquid medium (D), wherein the resin (A) includes hydrophobic structural units (a) and hydrophilic structural units (b), the hydrophobic structural units (a) include a hydrophobic structural unit (a1) in an amount of 40% by mass or more of the resin (A), the hydrophobic structural unit (a1) having an aromatic ring indirectly linked to an atom for forming the main chain of the resin (A), and a hydrophobic structural unit (a2) in an amount of 15% by mass or more of the resin (A), the hydrophobic structural unit (a2) being derived from a C1 to C4 alkyl acrylate or methacrylate, the hydrophilic structural units (b) include a structural unit (b1) derived from an acrylic acid or a methacrylic acid, and the content of the hydrophilic structural units (b) is 15% by mass or less in the resin (A).

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: The present invention provides an image forming method including ejecting an ink composition, using an ink jet apparatus, onto a recording medium thereby forming an image, the ink composition comprising a pigment, a water-soluble polymerizable monomer which is polymerized by actinic energy rays, and water, and the recording medium being composed of a base paper, a first layer including a binder, and a second layer including a white pigment and an acidic substance, which are disposed in this order, wherein a surface of the first layer is disposed on the base paper and has a Cobb water absorption capacity of 2.0 g/m2 or less at a contact time of 120 seconds as measured by a water-absorbing capacity test according to JIS P8140, a surface of the second layer has a water absorption of from 2 ml/m2 to 8 ml/m2 at a contact time of 0.5 seconds as measured by the Bristow's method, and the surface of the second layer has a pH of 5.5 or less.

Abstract: Provided is an image forming method including applying an ink that forms an image by inkjetting an ink composition containing coloring particles, a water-soluble polymerizable compound, a polymerization initiator and water onto a recording medium in which a base paper, a first layer containing a binder, and a second layer containing a white pigment are layered in this order, and a Cobb water absorption degree on a surface of the first layer placed on the base paper is 5.0 g/m2 or less as measured by a water absorption degree test according to JIS P8140 with a contact time of 15 seconds, and a water absorption amount on a surface of the second layer is 2 mL/m2 to 8 mL/m2 as measured by a Bristow method with a contact time of 0.5 seconds.

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 aqueous pigment dispersion including: (A) a pigment; (B) a dispersion polymer having a neutralization degree of from 50% to 90% and a solubility of from 0.2 g to 0.8 g per 5 ml of water (25° C.), and containing an acidic group and a hydrophobic structural unit (a) having an aromatic ring linked via a linking group to an atom included in a main chain, a content ratio of the aromatic ring being from 10% by mass to less than 20% by mass based on a total mass of the polymer; and (C) a water-based liquid medium.

Abstract: The inkjet recording method includes: a treatment liquid depositing step of applying treatment liquid onto a recording medium while holding the recording medium on a circumferential surface of a treatment liquid drum and conveying the recording medium by rotating the treatment liquid drum, and drying at least a portion of a solvent in the treatment liquid; an image forming step of ejecting ink from a line type inkjet head to deposit the ink onto the recording medium on which the treatment liquid has been deposited, while holding the recording medium on a circumferential surface of an image formation drum and conveying the recording medium by rotating the image formation drum, the ink containing at least a resin dispersant (A), a pigment (B) that is dispersed by the resin dispersant (A), self-dispersible polymer micro-particles (C) and an aqueous liquid medium (D), the ink having one of a solid component that is aggregated upon making contact with the treatment liquid and a solid component that is precipitated

Abstract: The method forms an image by directly depositing aqueous ink ejected from an inkjet recording apparatus onto a recording medium.

Abstract: The present invention provides a method for producing shape-anisotropic metal particles having at least reducing a metal compound in the presence of a polymer dispersant which has a mercapto group within its molecule. The present invention further provides a coloring composition which is obtained by disposing the shape-anisotropic metal particles in a solvent having an SP value of 25.8 MPa1/2 or less, the shape-anisotropic metal particles being produced by a method.

Abstract: An aqueous ink composition including a carbon black having a specific surface area of 200 m2/g or more but less than 300 m2/g according to a BET method, an organic solvent, a neutralizing agent and water, wherein the carbon black is coated with a water-insoluble resin including a structural unit represented by the following formula (I): wherein R1 represents a hydrogen atom or a methyl group, Ar represents an unsubstituted or substituted aromatic ring, and n represents an average repeating number and is from 1 to 6.

Abstract: An ink set for inkjet recording including: a cyan color aqueous ink composition containing a cyan color pigment, an organic solvent, a neutralizing agent and water, a magenta color aqueous ink composition containing a magenta color pigment, an organic solvent, a neutralizing agent and water, and a yellow color aqueous ink composition containing a yellow color pigment, an organic solvent, a neutralizing agent and water, wherein the cyan color pigment, the magenta color pigment, and the yellow color pigment are each a pigment coated with a water-insoluble resin containing a structural unit represented by the following Formula (I): wherein R1 represents a hydrogen atom or a methyl group, Ar represents an unsubstituted or substituted aromatic ring, and n represents an average repeating number and is from 1 to 6.

Abstract: An aqueous colorant dispersion including a colorant (A), a polymer (B), and an aqueous liquid medium (I), wherein the polymer (B) is a copolymer including a hydrophilic structural unit and a hydrophobic structural unit, the content of the hydrophobic structural unit in the polymer (B) being more than 80% by mass but less than 100% by mass, the hydrophobic structural unit includes a hydrophobic structural unit (a) having an aromatic ring linked via a linking group to an atom included in the main chain of the polymer (B), the content of aromatic rings in the polymer (B) is 10% by mass or more but less than 20% by mass with respect to the mass of the polymer (B), the hydrophilic structural unit includes a hydrophilic structural unit (b) including an ionic group, and the polymer (B) includes a structural unit (c) different from the hydrophobic structural unit (a) and from the hydrophilic structural unit (b), the content of the structural unit (c) in the polymer (B) being more than 15% by mass but less than 90% by

Abstract: An ink set for inkjet recording, including: an aqueous ink composition containing a pigment coated with a water-insoluble resin including a structural unit represented by the following formula (I), an organic solvent, a neutralizing agent, and water; and an aqueous liquid composition containing a component which aggregates the pigment in the aqueous ink composition when the aqueous liquid composition is mixed with the aqueous ink composition: wherein R1 represents a hydrogen atom or a methyl group, Ar represents an unsubstituted or substituted aromatic ring, and n represents an average number of repetition of 1 to 6.

Abstract: An aqueous inkjet recording ink including at least a resin (A), a pigment (B) dispersed with the resin (A), a resin emulsion (C), and an aqueous liquid medium (D), wherein the resin (A) includes hydrophobic structural units (a) and hydrophilic structural units (b), the hydrophobic structural units (a) include a hydrophobic structural unit (a1) in an amount of 40% by mass or more of the resin (A), the hydrophobic structural unit (a1) having an aromatic ring indirectly linked to an atom for forming the main chain of the resin (A), and a hydrophobic structural unit (a2) in an amount of 15% by mass or more of the resin (A), the hydrophobic structural unit (a2) being derived from a C1 to C4 alkyl acrylate or methacrylate, the hydrophilic structural units (b) include a structural unit (b1) derived from an acrylic acid or a methacrylic acid, and the content of the hydrophilic structural units (b) is 15% by mass or less in the resin (A).

Abstract: An aqueous inkjet recording ink including pigment particles coated with a water-insoluble resin, water, and a water-soluble organic solvent including at least one hydroxy group, wherein the water-insoluble resin has a salt-forming group and a structural unit which is derived from a methacrylate and has an aromatic ring linked via a linking group to an atom in the main chain of the water-insoluble resin, and the water-insoluble resin satisfies the condition that when the water-insoluble resin, an organic solvent, one equivalent of a neutralizing agent with respect to the salt-forming group, and water are mixed with a total content of the water-insoluble resin and the organic solvent being 35% by mass relative to the total mass of the mixture, an emulsion is formed without precipitation of the water-insoluble resin, and after the emulsion is allowed to stand for three hours, a transparent single phase is formed, or two separate phases are formed and at least an aqueous phase of the two phases is transparent.

Abstract: The invention provides a pigment composition having a pigment and a dispersant, wherein the dispersant is a copolymer comprising: a repeating unit (a) having a specific structure; and a repeating unit (b) having an ionic group. The invention ether provides a water-based pigment dispersion containing: the pigment composition; and water or a water-based carrier medium containing water and an organic solvent. The invention further provides a method for producing the water-based pigment dispersion. The invention further provides a water-based ink for ink jet recording containing the water-based pigment dispersion. The invention further provides a polymer compound having, as copolymerization components, a monomer having a specific structure, (meth)acrylic acid, and benzyl (meth)acrylate.

Abstract: The invention provides an aqueous colorant dispersion having: a colorant (A); a polymer (B); and an aqueous liquid medium (I), a method of producing the dispersion, and an aqueous ink for inkjet recording using the dispersion. The polymer (B) is a copolymer containing a hydrophilic structural unit and a hydrophobic structural unit. The hydrophobic structural unit contains a hydrophobic structural unit (a) containing a benzene ring which is not directly bonded to an atom that forms a main chain of the polymer (B). The hydrophilic structural unit contains a hydrophilic structural unit (b) containing an ionic group. The polymer (B) contains a structural unit (c) different from the hydrophobic structural unit (a) and the hydrophilic structural unit (b). A content of the hydrophobic structural unit and a content of the structural unit (c) with respect to a total mass of the polymer (B) are respectively in specific ranges.