Abstract: The present invention aims to provide an aqueous inkjet ink The present invention can provide an aqueous inkjet ink excellent in ejection performance and continuous ejection stability and capable of forming a coating excellent in abrasion resistance. The present invention relates to an aqueous inkjet ink containing: a pigment; fine resin particles; a surfactant; and water, the fine resin particles being contained in an amount of 0.5 to 10% by mass in solid content based on a total mass of the aqueous inkjet ink, the aqueous inkjet ink containing, as the surfactant, a surfactant represented by the following formula (I) in an amount of 0.01 to 1% by mass based on the total mass of the aqueous inkjet ink: wherein R1 is a C1-C15 linear or branched substituent containing at least one of a hydroxy group or an ether structure.

Abstract: The present invention provides a pre-coating agent capable of, without containing a polyvalent metal salt, preventing or reducing mottling and bleeding to improve the print image quality and preventing or reducing strike-through of an ink composition for inkjet recording during printing using the ink composition for inkjet recording, as well as being capable of preventing or reducing peeling and a decrease in hardness of an overcoat layer in the post-process (formation of the overcoat layer). Provided is a pre-coating agent for forming a precoat layer to receive an ink composition for inkjet recording, the pre-coating agent containing inorganic particles, an amine salt of an organic acid, a resin emulsion, and water, the inorganic particles having a particle size of 1 ?m to 10 ?m, the pre-coating agent being free from a polyvalent metal salt.

Abstract: It is an object of the present invention to provide a primer composition for surface-printed flexible packaging, an ink set, a surface-printed matter, and an inkjet printing method, which can impart excellent solid uniformity, bleeding resistance, abrasion resistance, alcohol resistance, and heat resistance to a coating film when an inkjet image is formed after applying the primer composition. Provided is a primer composition for surface-printed flexible packaging comprising an acryl-based resin emulsion emulsified with a polymer, N-oleoyl sarcosine, a hydrazine-based compound having at least two or more hydrazine residues in a molecule, and wax, wherein a content of the acryl-based resin emulsion is 3 to 40% by mass in terms of solid content, and wherein a glass transition temperature of the acryl-based resin emulsion is-40 to 30° C.

Abstract: Provided is an aqueous inkjet ink composition comprising a pigment, an alkali-soluble resin, a water-soluble organic solvent having a water solubility of 500 g/L or more at 25° C., water, and a surfactant, wherein a content of the water-soluble organic solvent is 20% by mass or more in the aqueous inkjet ink composition, and wherein a total amount of alkali metals is 1.5 g/L or less.

Abstract: An aqueous inkjet ink composition containing a pigment, an alkali-soluble resin, a surfactant, a water-soluble solvent, colloidal silica, and water, in which the surfactant includes a surfactant having an HLB value equal to or greater than 3 and less than 10 and a surfactant having an HLB value of 10-20 (inclusive), the water-soluble solvent has a boiling point of 170-250° C. (inclusive) at 1 atm, and the percentage of the colloidal silica in the aqueous inkjet ink composition is 0.05-2 mass % (inclusive). The aqueous inkjet ink composition has excellent storage stability, mechanical stability, discharge stability, coating film drying properties, and cissing resistance.

Abstract: It is an object of the present invention to provide a primer composition for surface-printed flexible packaging, an ink set, a surface-printed matter, and an inkjet printing method, which can impart excellent solid uniformity, bleeding resistance, abrasion resistance, alcohol resistance, and heat resistance to a coating film when an inkjet image is formed after applying the primer composition. Provided is a primer composition for surface-printed flexible packaging comprising an acryl-based resin emulsion emulsified with a polymer, N-oleoyl sarcosine, a hydrazine-based compound having at least two or more hydrazine residues in a molecule, and wax, wherein a content of the acryl-based resin emulsion is 3 to 40% by mass in terms of solid content, and wherein a glass transition temperature of the acryl-based resin emulsion is-40 to 30° C.

Abstract: An aqueous inkjet ink composition containing a pigment, an anionic group-containing resin, a resin emulsion, a surfactant, a water-soluble solvent, and water, in which a water-soluble solvent having a boiling point of at most 200° C. under 1 atm accounts for at least 90 mass % of the water-soluble solvent; the surfactant contains a polyoxyethylene alkyl ether and a silicone-based surfactant satisfying a specific condition; and the polyoxyethylene alkyl ether has an HLB value of 7-12. The aqueous inkjet ink composition has excellent discharge stability, favorable filling in a solid part and no unevenness even when printed and recorded on a non-absorptive print medium, and excellent drying properties on a paper surface.

Abstract: An object is to provide a method for storing or transporting an aqueous white ink composition for inkjet that does not cause precipitation of a pigment therein during storage for a long period or transport, and allows the pigment to be easily redispersed even if precipitation occurs. As means for solving the problems, a storing method is provided that includes placing an aqueous white ink composition for inkjet containing titanium oxide and a pigment dispersant in a tank and maintaining the entire aqueous white ink composition for inkjet in the tank at a temperature of ?5 to ?35° C.

Abstract: Provided is an ink composition for inkjet printing, comprising a coloring material, water, an organic solvent, resin fine particles, and a surfactant, wherein the organic solvent includes a first organic solvent and a second organic solvent that is different from the first organic solvent, wherein a total amount of the first organic solvent and the second organic solvent is 90 mass % or more in the organic solvent, wherein the first organic solvent is propylene glycol, wherein the second organic solvent has a boiling point of 120 to 200° C., and includes at least one of glycols, glycol ethers, or methoxybutanols, and wherein a content of the first organic solvent is 15 to 50 mass % in the ink composition.

Abstract: A primer composition for a process of inkjet printing includes a resin emulsion, a cohesion promoter, surfactant(s) (A), nonionic surfactant(s) (B), and water. The resin emulsion includes a polyolefin-based resin emulsion and/or a urethane-based resin emulsion. The surfactant(s) (A) include(s) an acetylene-based surfactant and/or a silicone-based surfactant. Each nonionic surfactant (B) has a HLB value of 10.0 or greater but under 15.5 and has multiple polyoxyalkylene groups in a molecule, and includes a polyoxyalkylene group-containing fatty acid glyceryl, a polyoxyalkylene group-containing aliphatic amine, and/or a polyoxyalkylene group-containing sorbitan fatty acid ester. The content percentage of the nonionic surfactant(s) (B) in the primer composition is 3.0% by mass or lower.

Abstract: A primer composition for a process of inkjet printing includes a resin emulsion, cohesion promoter, surfactant(s) (A), nonionic surfactant(s) (B), and water. The resin emulsion includes a polyolefin-based resin emulsion and/or a urethane-based resin emulsion. The surfactant(s) (A) include(s) an acetylene-based surfactant and a silicone-based surfactant. Each nonionic surfactant (B) had a HLB value of 10.0 or greater but under 15.5 and also had multiple polyoxyalkylene groups in the molecule, and includes a polyoxyalkylene group-containing fatty acid glyceryl, a polyoxyalkylene group-containing aliphatic amine, and/or a polyoxyalkylene group-containing sorbitan fatty acid ester. The content percentage of the nonionic surfactant(s) (B) in the primer composition is 3.0% by mass or lower; and no organic solvent is contained, or the content of organic solvent(s) in the primer composition is 1.0% by mass or lower.

Abstract: An inkjet ink set in which an aqueous yellow ink composition contains at least one of PY17, PY83, PY128, PY155, and PY180; an aqueous magenta ink composition contains at least one of PR146, PR150, PR176, PR185, and PR254; an aqueous cyan ink composition contains PB15:3; an aqueous black ink composition contains PBk7; an aqueous violet ink composition contains PV23; and each of the aqueous inkjet ink compositions contains an aqueous medium and an alkali-soluble or self-emulsifying polyurethane resin as a binder resin. The inkjet ink set has aqueous inkjet ink compositions having excellent laminate strength and heat resistance.

Abstract: A primer composition including a resin emulsion, an aggregation accelerator, a surfactant, and water, the surfactant containing one or more of acetylene-based surfactants and silicone-based surfactants, and a nonionic surfactant other than the surfactant, the nonionic surfactant having an HLB value of 10 or above and below 15.5 and having multiple polyoxyalkylene groups, and the proportion of the nonionic surfactant in the primer composition is 3 mass % or below. The primer composition has excellent storage stability and makes it possible to form a primer layer that has excellent transparency and that produces excellent bleeding resistance and printability when a solid image is printed by an aqueous inkjet ink composition.

Abstract: The present invention provides a pre-coating agent capable of, without containing a polyvalent metal salt, preventing or reducing mottling and bleeding to improve the print image quality and preventing or reducing strike-through of an ink composition for inkjet recording during printing using the ink composition for inkjet recording, as well as being capable of preventing or reducing peeling and a decrease in hardness of an overcoat layer in the post-process (formation of the overcoat layer). Provided is a pre-coating agent for forming a precoat layer to receive an ink composition for inkjet recording, the pre-coating agent containing inorganic particles, an amine salt of an organic acid, a resin emulsion, and water, the inorganic particles having a particle size of 1 ?m to 10 ?m, the pre-coating agent being free from a polyvalent metal salt.

Abstract: It is an object of the present invention to provide an aqueous white ink composition for surface-printed flexible packaging which is excellent in heat resistance, blocking resistance, alcohol resistance, abrasion resistance, solid uniformity, and bleeding resistance. Provided is an aqueous white ink composition for surface-printed flexible packaging, comprising a white pigment, an acryl-based resin emulsion emulsified with a polymer, N-oleoyl sarcosine, a hydrazine-based compound having at least two or more hydrazine residues in a molecule, and wax, wherein a content of the acryl-based resin emulsion is 3 to 40% by mass in terms of solid content, and wherein a glass transition temperature of the acryl-based resin emulsion is ?40 to 30° C.

Abstract: An object is to obtain a white ink which is easy to redisperse and is redispersible by being shaken several tens of times with weak force at most, or alternatively, without being shaken. As a solution, a white ink composition is provided which contains 5.0 to 20.0% by mass of a titanium oxide in an ink composition; 3.0 to 60.0 parts by mass of a solid content of alkali-soluble resin relative to 100 parts by mass of a pigment or pigments in the ink composition, wherein building blocks of the alkali-soluble resin are styrene; stearyl acrylate and/or lauryl acrylate; and acrylic acid, and the alkali-soluble resin has a weight-average molecular weight of 10,000 or more, an acid value of 100 mgKOH/g or more, and a glass transition temperature of 50° C. or more; and a surfactant.

Abstract: A cleaning fluid used in an ink-jet printer ejecting an aqueous ink-jet ink containing a pigment and an alkali-soluble resin, to clean a portion of the ink-jet printer to which the ejected aqueous ink-jet ink is adherent. The cleaning fluid includes a surfactant, an antiseptic, and water. The surfactant is a compound having a polyoxyalkylene skeleton and an HLB of 9-20, and the antiseptic includes a compound having a hydantoin skeleton, the content of which is 0.05-0.3 mass %. The cleaning fluid does not attack nozzle plates made of silicone and has satisfactory storage stability, antiseptic effect, and ability to remove aqueous ink-jet inks.

Abstract: An aqueous inkjet ink composition containing a pigment, an alkali-soluble resin, a surfactant, a water-soluble solvent, colloidal silica, and water, in which the surfactant includes a surfactant having an HLB value equal to or greater than 3 and less than 10 and a surfactant having an HLB value of 10-20 (inclusive), the water-soluble solvent has a boiling point of 170-250° C. (inclusive) at 1 atm, and the percentage of the colloidal silica in the aqueous inkjet ink composition is 0.05-2 mass % (inclusive). The aqueous inkjet ink composition has excellent storage stability, mechanical stability, discharge stability, coating film drying properties, and cissing resistance.

Abstract: An object is to provide a method for storing or transporting an aqueous white ink composition for inkjet that does not cause precipitation of a pigment therein during storage for a long period or transport, and allows the pigment to be easily redispersed even if precipitation occurs. As means for solving the problems, a storing method is provided that includes placing an aqueous white ink composition for inkjet containing titanium oxide and a pigment dispersant in a tank and maintaining the entire aqueous white ink composition for inkjet in the tank at a temperature of ?5 to ?35° C.

Abstract: A primer composition including a resin emulsion, an aggregation accelerator, a surfactant, and water, the surfactant containing one or more of acetylene-based surfactants and silicone-based surfactants, and a nonionic surfactant other than the surfactant, the nonionic surfactant having an HLB value of 10 or above and below 15.5 and having multiple polyoxyalkylene groups, and the proportion of the nonionic surfactant in the primer composition is 3 mass % or below. The primer composition has excellent storage stability and makes it possible to form a primer layer that has excellent transparency and that produces excellent bleeding resistance and printability when a solid image is printed by an aqueous inkjet ink composition.