Abstract: The invention provides an ink jet ink including a coloring material, a polymer particle, a crosslinking agent and an aqueous medium. The polymer particle has a unit derived from a compound represented by the following general formula (1) and a glass transition temperature of 25° C. or less. The crosslinking agent has a functional group capable of forming a crosslinked structure with a ketone group derived from the compound represented by the general formula (1) by a dehydration reaction. The mass ratio of a content (% by mass) of the coloring material based on the total mass of the ink to a content (% by mass) of the polymer particle based on the total mass of the ink is 0.2 times or more and 2.5 times or less.

Abstract: An ink containing a first coloring material and a second coloring material, the sum total of these contents being 6.0% by mass or less. The first coloring material is a black coloring material exhibiting a difference ??max1 of 20.0 or more between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, the second coloring material is a specific coloring material exhibiting a difference ??max2 of 12.0 or less between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, and the sum of the ??max1 and the ??max2 is 35.0 or less.

Abstract: The present invention provides an ink jet ink that is capable of recording an image excellent in light resistance and ozone resistance and has excellent intermittent ejection stability. The ink jet ink contains a coloring material and a water-soluble organic solvent. The coloring material contains a compound represented by the following general formula (I), the water-soluble organic solvent contains ethylene urea end an alkanediol having 4 to 6 carbon atoms, and a content A (% by mass) of the coloring material, a content B (% by mass) of the ethylene urea and a content C (% by mass) of the alkanediol having 4 to 6 carbon atoms based on a total mass of the ink satisfy relationships of 0.20?B/A?10.0 and 0.10?C/A?10.0.

Abstract: The invention provides an ink containing a coloring material and a water-soluble organic solvent, wherein the coloring material is a compound represented by the following general formula (1), and the water-soluble organic solvent includes an alkanediol having 4 to 6 carbon atoms: wherein rings A, B, C and D each indicated by a broken line are, independently of one another, a benzene ring or a nitrogen-containing heteroaromatic ring, the number of the nitrogen-containing heteroaromatic ring is more than 0.0 and 3.0 or less, the remainder is the benzene ring, R1 is an alkyl group, R2 is an alkylene group, X is an anilino group having one or more sulfonic groups, m is more than 0.0 and less than 3.9, n is 0.1 or more and less than 4.0, and the sum of m and n is 1.0 or more and less than 4.0.

Abstract: The invention provides an ink composition, which is improved in dispersibility and fastness properties and is excellent in dispersion stability and re-solubility owing to dispersed particles in which a coloring material is included by a crosslinked hydrophobic block segment in a dispersing polymer. The ink composition contains an amphiphilic block polymer compound, in which a coloring material is included, and a medium, wherein the amphiphilic block polymer compound, in which the coloring material is included, forms a dispersed particle having the hydrophobic block segment as an internal core part, and the hydrophobic block segment is crosslinked.

Abstract: The invention provides an ink jet recording ink containing a self-dispersion pigment to a surface of which an anionic functional group represented by the following general formula (1) is bonded directly or through another atomic group, an ammonium salt of an organic carboxylic acid, water, and a water-soluble compound having a hydrophilicity-hydrophobicity coefficient of 0.26 or more as defined by the following equation (A), the ink having a surface tension of 34 mN/m or less, wherein M1 and M2 are, independently of each other, a hydrogen atom, alkali metal, ammonium or organic ammonium; Hydrophilicity-hydrophobicity coefficient=[(Water activity of a 20% aqueous solution)?(Molar fraction of water in the 20% aqueous solution)]/[1?(Molar fraction of water in the 20% aqueous solution)]??(A).

Abstract: The invention provides an ink jet ink including a coloring material, a polymer particle, a crosslinking agent and an aqueous medium. The polymer particle has a unit derived from a compound represented by the following general formula (1) and a glass transition temperature of 25° C. or less. The crosslinking agent has a functional group capable of forming a crosslinked structure with a ketone group derived from the compound represented by the general formula (1) by a dehydration reaction. The mass ratio of a content (% by mass) of the coloring material based on the total mass of the ink to a content (% by mass) of the polymer particle based on the total mass of the ink is 0.2 times or more and 2.5 times or less.

Abstract: An ink jet printing ink for use in an ink jet printing method. The ink is ejected from a print head by the action of thermal energy and includes water, a self-dispersing pigment, and at least two types of resin particles. One of the at least two types of resin particles (resin particle A) and another of the at least two types of resin particles (resin particle B) have an average particle size of 80 nm or more but 220 nm or less and an acid value of 25 mgKOH/g or more but 150 mgKOH/g or less. The resin particle A has a glass transition temperature of 25 degrees Celsius or less. The resin particle B has a glass transition temperature of 25 degrees Celsius or more. A difference in glass transition temperature between the resin particle A and the resin particle B is 10 degrees Celsius or more.

Abstract: An ink for ink jet recording, the ink being used in an ink jet recording method that includes ejecting an ink from a recording head by the action of thermal energy, includes water, a self-dispersing pigment, and polymer particles, in which the polymer particles have a glass transition temperature of 25 degrees (Celsius) or lower, an average particle size of 80 nm to 220 nm, and an acid value of 25 mgKOH/g to 150 mgKOH/g.

Abstract: Aspects of the present invention provide an ink-jet recording method including the step of applying an ink to a recording medium by discharging the ink from a recording head by action of thermal energy and the step of fixing the ink to the recording medium by heating the ink applied to the recording medium. The ink contains water, a self-dispersing pigment, and resin particles. The resin particles have a glass transition temperature of not less than 25° C., an average particle diameter of 70 nm or more and 220 nm or less, and an acid value of 25 mg KOH/g or more and 150 mg KOH/g or less.

Abstract: The invention provides an ink jet recording ink containing a self-dispersion pigment to a surface of which an anionic functional group represented by the following general formula (1) is bonded directly or through another atomic group, an ammonium salt of an organic carboxylic acid, water, and a water-soluble compound having a hydrophilicity-hydrophobicity coefficient of 0.

Abstract: A novel liquid composition set is provided for forming an image or pattern by functional substances such as a colorant without causing blurring. Each of the liquid compositions of the set includes a functional substance, an amphiphilic block copolyrner or graft copolymer having an organic acid group, and a liquid medium, wherein the organic acid groups of the copolymers are different in pKa, and the amphiphilic polymer contained in the first liquid composition becomes viscous by pH change on contact with the second liquid composition different in pH from the first liquid composition.

Abstract: Polyalkenyl ether is produced by polymerizing alkenyl ether represented by the following general formula (I): CHR1?CH(OR2)??(I) wherein R1 represents a hydrogen atom or a methyl group, R2 represents a monovalent organic group, and R2 contains a silicon atom or at least one atom selected from the group consisting of elements from group 15 to group 17, in the presence of a halide of an element other than Al, or an organometallic compound of an element other than Al, and a nonionic oxygen-containing or nonionic nitrogen-containing organic compound.

Abstract: A composition comprises a solvent, and an electroconductive substance and an amphiphilic block copolymers having a polyalkenyl ether repeating-unit structure, or a block copolymer enclosing an electroconductive substance. A black ink composition comprises a fine particulate metal having an average particle diameter of not more than 20 nm, an amphiphilic block copolymer, and a solvent. A method for forming an electroconductive pattern by applying the composition. A method for forming an electroconductive pattern by applying a composition comprises a block copolymer enclosing an electroconductive substance, system to form an electroconductive pattern on the substrate.

Abstract: The present invention relates to a stimulus responsive composition, which includes a polymer complex that a polymer including repeated units of polyvinyl ether structure is chemically bonded to a functional substance, and a solvent. It is desirable that a solvent is water and that the polymer in the composition contains a polyvinyl ether structure. The present invention also relates to an ink composition including the above composition, an image forming method and image forming device using the above composition, and recording medium contains a stimulating material or composition which stimulates the above composition.

Abstract: The invention provides an ink composition, which is improved in dispersibility and fastness properties and is excellent in dispersion stability and re-solubility owing to dispersed particles in which a coloring material is included by a crosslinked hydrophobic block segment in a dispersing polymer. The ink composition contains an amphiphilic block polymer compound, in which a coloring material is included, and a medium, wherein the amphiphilic block polymer compound, in which the coloring material is included, forms a dispersed particle having the hydrophobic block segment as an internal core part, and the hydrophobic block segment is crosslinked.

Abstract: The invention provides a block polymer compound enabling satisfactory dispersion of a colorant in a solvent, and an ink composition containing such block polymer compound. The block polymer compound of the invention is a block polymer compound having at least three block segments, comprising block segments A, B and C arranged in succession, wherein the block segment C is most solvent attractive while the block segment A is most solvent repulsive, and at least either one of the block segments includes an ionic group or an acidic group.

Abstract: An amphiphilic block copolymer having an ionic functional group, wherein the ratio (N10/N5) of a rotational viscosity (N10) of a 10% by mass solution of the copolymer in purified water to a rotational viscosity (N5) of a 5% by mass solution of the copolymer in purified water is 2.5 or lower.

Abstract: There is provided a polymer compound including a repetitive unit structure represented by the following general formula (2): General formula (2): (where X? represents a polyalkenyl group; A represents a linear or branched alkylene group having a carbon atom number of 1 to 15, which may be substituted; m represents an integer of 0 to 30; B represents a single bond or an alkylene group which may be substituted; D represents an aromatic ring structure which may be substituted; n represents an integer of 0 to 10; and R represents a hydrogen atom, an alkyl group which may be substituted, or an aromatic ring structure which may be substituted). The polymer compound is suitable for improving dispersibility of a coloring material or solid material in an ink composition or toner composition.

Abstract: A block polymer compound containing block segments, characterized in that at least one hydrophilic segment among the block segments is a copolymer segment composed of an ionic or hydrophilic repeating unit structure and a hydrophobic repeating unit structure.