Abstract: An ink composition comprises a pigment coated with a water-insoluble polymer as a coloring material, a resin emulsion as an additive, water, and a water-soluble organic compound. The weight average molecular weight of the water-insoluble polymer is from 50,000 to 150,000. The resin emulsion comprises a resin comprising a monomer component of the same kind as the monomer component constituting the water-insoluble polymer and has a weight average molecular weight of 1.5 to 4 times that of the water-insoluble polymer. The average particle size of the resin emulsion is from 20 to 200 nm, and the average particle size of pigment particles in the ink composition ranges from 50 to 150 nm.

Abstract: An ink composition comprises at least a coloring agent coated with a water-insoluble polymer and resin particles. The water-insoluble polymer is a polymer obtained by a solution polymerization process using at least a polymerizable unsaturated monomer and a polymerization initiator. The coloring agent coated with the water-insoluble polymer is a coloring material obtained by a phase inversion emulsification process in which, after the water-insoluble polymer is dissolved in an organic solvent, at least the coloring agent and water are added thereto, followed by mixing. The organic solvent is removed to perform dispersion in an aqueous system. The resin particles are a polymer obtained by an emulsion polymerization process using at least a crosslinking agent. The average particle size of the resin particles is from 20 to 80 nm.

Abstract: An ink set includes: at least one black ink composition that contains at least a self-dispersing pigment and a resin emulsion; and at least one color ink composition that contains at least an organic pigment covered with water-insoluble polymer and a resin emulsion.

Abstract: Problem: To improve clogging and ink droplet deflection. Solving Means: An ink composition comprising at least water, a colorant and an aromatic compound having a carboxyl group, which contains at least one member selected from the group consisting of a sodium ion, a potassium ion and an ammonium ion and also contains a lithium ion. Alternatively, an ink composition comprising at least water, a specific cyan dye and an aromatic compound having a carboxyl group, which contains a lithium ion and also contains a sodium ion and/or a potassium ion.

Abstract: An inkjet recording method for producing a black image on a recording medium by using an ink set having two or more types of ink compositions including at least one black ink composition and at least one color ink composition, wherein the recording medium has a recording surface with a 20-degree specular gloss value as defined by JIS Z8741 of 10% or larger, and an image clarity value as defined by JIS K7105 of 15-95%; and wherein the discharged weight of the black ink composition upon producing the black image is 0-10 weight % in proportion to the total discharged weight (100 weight %) of the ink composition discharged upon producing the black image.

Abstract: There is provided a water-based ink that can exhibit high gloss on gloss paper and has excellent fixation while maintaining ink reliability such as recovery from clogging, continuous printing stability, and ink storage stability. The water-based ink comprises at least yellow pigment-containing polymer particles A and pigment-free polymer particles B. The polymer particles A are formed of a water insoluble vinyl polymer produced by polymerizing a specific monomer composition A, and the polymer particles B are formed of a water insoluble vinyl polymer produced by polymerizing a specific monomer composition B and has a minimum film forming temperature of 20° C. or above. The polymer particles B have an average particle diameter of 30 to 60 nm.

Abstract: An object of the present invention is to provide an ink composition which can provide an image having excellent glossy texture to various recording media, particularly to a glossy recording medium, is decreased in bronzing phenomenon, and is also good in fixing property and scratch resistance such as gloss change. The invention relates to an ink composition containing at least a coloring agent coated with a water-insoluble polymer as a coloring material and a resin emulsion as an additive, wherein the weight average molecular weight of the water-insoluble polymer is from 50,000 to 150,000, and wherein the resin emulsion comprises a resin comprising a monomer component of the same kind as the monomer component constituting the water-insoluble polymer and having a weight average molecular weight of 1.

Abstract: An ink composition containing at least water, at least one member selected from a compound represented by formula (1) shown below and a salt thereof, and at least one member selected from an aromatic compound having a carboxyl group and a salt thereof: In formula (1), A represents a residue of a 5-membered heterocyclic diazo component A-NH2; B1 and B2 each represents —CR1? or —CR2?, or either one of B1 and B2 represents a nitrogen atom and the other represents —CR1? or —CR2?; R5 and R6 each independently represents a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group or the like; and G, R1 and R2 each independently represents a hydrogen atom, a halogen atom, an aliphatic group, an aromatic group, a heterocyclic group or the like.

Abstract: Problem: To improve clogging and ink droplet deflection. Solving Means: An ink composition comprising at least water, a colorant and an aromatic compound having a carboxyl group, which contains at least one member selected from the group consisting of a sodium ion, a potassium ion and an ammonium ion and also contains a lithium ion. Alternatively, an ink composition comprising at least water, a specific cyan dye and an aromatic compound having a carboxyl group, which contains a lithium ion and also contains a sodium ion and/or a potassium ion.

Abstract: Objects of the present invention are to provide a magenta ink composition having good light-fastness and gas resistance, and excellent moisture resistance and clogging resistance, and to provide a magenta ink composition having excellent colorability in addition to these characteristics. The present invention provides a magenta ink composition containing, as colorants, at least one selected from compounds represented by undermentioned formula (1) and salts thereof, and at least one selected from compounds represented by undermentioned formula (2) and salts thereof. Moreover, the present invention also provides a magenta ink composition containing, as colorants, the above and in addition at least one selected from compounds represented by undermentioned formula (3). (Definitions of the symbols in the formulae are as in the claims.

Abstract: Problem to be Solved: To provide an ink composition having high reliability in terms of clogging or the like and compatibly having all of light fastness, gas fastness and moisture resistance. Means to Solve the Problem: An ink composition comprising at least water, at least one member selected from a compound represented by formula (1) shown below and a salt thereof, and at least one member selected from an aromatic compound having a carboxyl group and a salt thereof: Formula (1): In formula (1), A represents a residue of a 5-membered heterocyclic diazo component A-NH2; B1 and B2 each represents —CR1? or —CR2?, or either one of B1 and B2 represents a nitrogen atom and the other represents —CR1? or —CR2?; R5 and R6 each independently represents a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group or the like; and G, R1 and R2 each independently represents a hydrogen atom, a halogen atom, an aliphatic group, an aromatic group, a heterocyclic group or the like.

Abstract: To provide an ink set capable of recording images with good ozone fastness on a recording medium, an ink set of the present invention comprises at least a yellow ink composition, a magenta ink composition, and a cyan ink composition. The cyan ink composition contains at least one of the compounds expressed by formula (1) below as a cyan dye: and the magenta ink composition contains, as a colorant, at least one substance selected from the group consisting of compounds expressed by formula (2) below: and salts thereof (in formula (2), A represents an alkylene group, an alkylene group containing a phenylene group, or a group expressed by formula (3) below: and X represents a group selected from the group consisting of NH2, OH, and Cl).

Abstract: An inkjet recording method for producing a black image on a recording medium by using an ink set having two or more types of ink compositions including at least one black ink composition and at least one color ink composition, wherein the recording medium has a recording surface with a 20-degree specular gloss value as defined by JIS Z8741 of 10% or larger, and an image clarity value as defined by JIS K7105 of 15-95%; and wherein the discharged weight of the black ink composition upon producing the black image is 0-10 weight % in proportion to the total discharged weight (100 weight %) of the ink composition discharged upon producing the black image.

Abstract: An ink set includes: at least one black ink composition that contains at least a self-dispersing pigment and a resin emulsion; and at least one color ink composition that contains at least an organic pigment covered with water-insoluble polymer and a resin emulsion.

Abstract: [The present invention] provides a surface treatment method for recorded matter which can improve the weather resistance characteristics such as light resistance, gas resistance and the like of recorded matter in which images are recorded on the recording medium, as well as providing a surface-treated product using this surface treatment method, and a surface treatment apparatus. The surface treatment method of the present invention is characterized in that the surface of recorded matter in which images are recorded on a recording medium is treated using a specified treatment agent. The abovementioned treatment agent is a treatment agent which contains one or more active constituents selected from the group consisting of sulfur compounds, nitrogen compounds, fluorine compounds, natural resins and synthetic resins, or a treatment agent comprising water or an organic solvent.

Abstract: There is provided a water-based ink that can exhibit high gloss on gloss paper and has excellent fixation while maintaining ink reliability such as recovery from clogging, continuous printing stability, and ink storage stability. The water-based ink comprises at least yellow pigment-containing polymer particles A and pigment-free polymer particles B. The polymer particles A are formed of a water insoluble vinyl polymer produced by polymerizing a specific monomer composition A, and the polymer particles B are formed of a water insoluble vinyl polymer produced by polymerizing a specific monomer composition B and has a minimum film forming temperature of 20° C. or above. The polymer particles B have an average particle diameter of 30 to 60 nm.

Abstract: The present invention provides a black ink composition obtained by mixing at least one colorant selected from the group consisting of a compound represented by the following formula (1) and a salt thereof, one or more organic acids and one or more organic bases: wherein R1 represents a phenyl group having a substituent group or a naphthyl group having a substituent group, R2 represent a phenylene group having a substituent group or a naphthylene group having a substituent group, R3 represents a 5- to 7-membered heterocyclic ring having at least one double bond and substituent group, and further, the above-mentioned substituent groups in the above-mentioned R1 to R3 are each independently selected from the group consisting of OH, SO3H, PO3H2, CO2H, NO2, NH2, a C1–4 alkyl group, a C1–4 alkyl group having a substituent group, a C1–4 alkoxyl group, a C1–4 alkoxyl group having a substituent group, an amino group, an amino group having a substituent group and a phenyl group having a substituent group.

Abstract: The present invention provides a black water-based ink composition that has excellent resistance to light and ozone, has an excellent hue as a black ink, and also has excellent storage stability. A black water-based ink composition is prepared by combining at least one type of black dye selected from the group consisting of compounds expressed by the following formula (1) and salts thereof: and at least one type of dye other than a black dye, and the hue is adjusted by adding the dye other than a black dye. It is preferable if the dye other than the black dye is a compound that has at least one type of group selected from the group consisting of an —SO3H group, —COOH group, —SO3M group, and —COOM group (where M in these groups is an alkali metal atom), and is not an ammonium salt or a salt with an organic cation. It is also preferable for the dye other than the black dye to be a dye selected from the group consisting of yellow dyes and magenta dyes.

Abstract: A protecting film for covering a recording face of a recording medium includes a support, a first protective layer formed of thermoplastic resin and formed on the support, and a second protective layer formed of thermoplastic resin, and laminated on the first protective layer. An image is formed on the recording face by a thermal transfer type overcoat process.

Abstract: The invention provides a protective layer-transferring film for ink jet having a transferable protective layer which is relasably formed on a heat-resistant film and which is to be heat transferred onto recorded matter having thereon an image formed by an ink jet recording system, in which the transferable protective layer is formed from a plurality of aqueous resin emulsions different in minimum film-forming temperature.