# US 8,770,733 B2 · Water-based inkjet ink, method for producing inkjet printed product using the same, and method for producing water-based inkjet ink > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,733 B2 - Document ID: US8770733B2 - Status: Granted - Kind: B2 - Application number: 13/264,952 - Filed: 2010-04-20 - Published: 2012-02-16 - Granted: 2014-07-08 - Earliest claimed: 2009-04-23 - Assignees: Konica Minolta IJ Technologies, Inc. - Applicants: Hidenobu Ohya; Manabu Kaneko; Masami Kato - Inventors: Hidenobu Ohya; Manabu Kaneko; Masami Kato - Web page: https://patentgrep.com/patent/US8770733B2 ## CPC - C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing - C09D 11/326: characterised by the pigment dispersant - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract Disclosed is an inkjet ink which provides a high-quality image in that whitening of the recorded image film is inhibited, durability of the image is good, and there is no banding, and the like; inkjet injection stability and ink shelf life are excellent; and head maintenance returnability is excellent. Also disclosed are a method for producing an inkjet printed product using the same, and a method for producing a water-based inkjet ink. This inkjet ink comprises at least a) a pigment, b) a polymer dispersant comprising polyethylene oxide groups having an acid value of less than 50 mgKOH/g (c) acrylic copolymer resin, and (d) at least one water-soluble organic solvent selected from glycol ethers and 1,2-alkanediols having 4 or more carbons. ## Claims ### Claim 1 A water-based inkjet ink comprising at least a) a pigment, b) a polymer dispersant comprising polyethylene oxide groups having an acid value of less than 50 mgKOH/g, c) acryl copolymer resin having an acid value of not less than 50 mgKOH/g and not more than 100 mgKOH/g, d) at least one water-soluble organic solvent selected from glycol ethers or 1,2-alkanediols having 4 or more carbon atoms, and (e) a silicone based or fluorine based surfactant, wherein the acryl copolymer resin consists of acryl based monomers, methacryl based monomers, or a combination thereof. ### Claim 2 (depends on 1) The water-based inkjet ink of claim 1, wherein a total amount of at least one water-soluble organic solvent selected from glycol ethers or 1,2-alkanediols having 4 or more carbon atoms is 3-15% by mass based on the water-based inkjet ink. ### Claim 3 (depends on 1) The water-based inkjet ink of claim 1, wherein the acryl copolymer resin is partially or completely neutralized by an amine. ### Claim 4 (depends on 1) The water-based inkjet ink of claim 1, wherein the polymer dispersant comprising polyethylene oxide groups having an acid value of less than 50 mgKOH/g is an acryl copolymer comprising polyethylene oxide groups. ### Claim 5 (depends on 1) The water-based inkjet ink of claim 1, wherein the acryl copolymer resin is synthesized by a monomer consisting of the acryl or the methacryl based monomers. ### Claim 6 (depends on 1) A method for producing an inkjet printed product, wherein the water-based inkjet ink of claim 1 is printed on a preliminary heated recording medium. ### Claim 7 (depends on 6) The method for producing an inkjet printed product of claim 6, wherein the recording medium is a non-water-absorption recording medium. ### Claim 8 (depends on 6) The method for producing an inkjet printed product of claim 6, wherein the water-based inkjet ink is printed followed by drying the recording medium by using drying member. ### Claim 9 A method for producing an inkjet ink, comprising: mixing a pigment and a polymer dispersant comprising polyethylene oxide groups having an acid value of less than 50 mgKOH/g to form a pigment dispersion; and mixing the pigment dispersion, an acryl copolymer resin, a solvent, and a surfactant to produce the inkjet ink, wherein the solvent is a water-soluble organic solvent selected from glycol ethers or 1,2-alkanediols having 4 or more carbon atoms, the surfactant is a silicon based or fluorine base surfactant, and the acryl copolymer resin has an acid value of not less than 50 mgKOH/g and not more than 100 mgKOH/g and the acryl copolymer consists of acryl based monomers, methacryl based monomers, or a combination thereof. ### Claim 10 (depends on 9) The method for producing an inkjet ink of claim 9, wherein a weight average molecular weight of the polymer dispersant comprising polyethylene oxide groups having an acid value of less than 50 mgKOH/g is not less than 5,000 and not more than 1,000,000.