# US 8,770,734 B2 · Water-based ink for ink-jet recording, ink cartridge, ink-jet recording method, method for preventing corrosion of metal member, method for producing water-based ink for ink-jet recording, and ink-jet recording apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,734 B2 - Document ID: US8770734B2 - Status: Granted - Kind: B2 - Application number: 13/359,562 - Filed: 2012-01-27 - Published: 2012-08-30 - Granted: 2014-07-08 - Earliest claimed: 2011-02-28 - Assignees: Brother Kogyo Kabushiki Kaisha - Applicants: Junichiro Sugimoto - Inventors: Junichiro Sugimoto - Web page: https://patentgrep.com/patent/US8770734B2 ## CPC - B41J 2/14233: {of film type, deformed by bending and disposed on a diaphragm} - C09D 11/324: containing carbon black - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - 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 There is provided a water-based ink for ink-jet recording including: a self-dispersible carbon black modified by carboxylic acid group; water; and a water-soluble organic solvent, wherein oxalate ion is contained in the water-based ink in a amount of not more than 45 ppm by weight. ## Claims ### Claim 1 A water-based ink for inkjet recording comprising: a refined self-dispersible carbon black modified by carboxylic acid group, wherein the refining is effective to provide an oxalate ion concentration in the water-based ink of not more than 45 ppm by weight; water; and a water-soluble organic solvent. ### Claim 2 (depends on 1) The water-based ink for ink jet recording according to claim 1, wherein the refining is effective to provide an oxalate ion concentration in the water-based ink in an amount ranging from 1 ppm by weight to 45 ppm by weight. ### Claim 3 (depends on 1) The water based ink for ink jet recording according to claim 1, further comprising 1,2,3-benzotriazole. ### Claim 4 (depends on 1) The water based ink for ink jet recording according to claim 1, wherein the water based ink is discharged by an ink discharge mechanism including a metal member. ### Claim 5 (depends on 4) The water based ink for ink-jet recording according to claim 4, wherein the metal member contains nickel. ### Claim 6 (depends on 1) An ink cartridge comprising the water-based ink for ink-jet recording as defined in claim 1. ### Claim 7 (depends on 6) An ink jet recording apparatus, comprising: an ink cartridge accommodating section in which the ink cartridge as defined in claim 6 is accommodated; an ink discharge mechanism which discharges the water-based ink of the ink cartridge; and a metal member which contacts with the water-based ink. ### Claim 8 (depends on 7) The ink jet recording apparatus according to claim 7, wherein the metal member is included in the ink discharge mechanism. ### Claim 9 (depends on 7) The ink-jet recording apparatus according to claim 7, wherein the metal member contains nickel. ### Claim 10 (depends on 1) An ink-jet recording method which performs recording on a recording medium comprising: preparing the water-based ink for ink jet recording as defined in claim 1; and discharging the water-based ink to the recording medium. ### Claim 11 (depends on 10) The ink jet recording method according to claim 10, wherein the water-based ink is discharged to the recording medium by an ink discharge mechanism including a metal member. ### Claim 12 A method for preventing corrosion of a metal member, of an ink jet recording apparatus, which contacts with a water-based ink for ink-jet recording, the method comprising: providing a refined carboxylic acid group-modified self-dispersible carbon black dispersion, wherein the refining is effective to provide an oxalate ion concentration in the water-based ink of not more than 45 ppm by weight; and preparing the water-based ink containing a self-dispersible carbon black modified by carboxylic acid group, water, and a water-soluble organic solvent; and bringing the water-based ink into contact with the metal member. ### Claim 13 (depends on 12) The method for preventing the corrosion of the metal member according to claim 12, wherein the refining is effective to provide an oxalate ion concentration in the water-based ink in an amount ranging from 1 ppm by weight to 45 ppm by weight. ### Claim 14 (depends on 12) The method for preventing the corrosion of the metal member according to claim 12, wherein the ink jet recording apparatus includes an ink discharge mechanism which discharges the water-based ink; and the metal member is included in the ink discharge mechanism. ### Claim 15 (depends on 12) The method for preventing the corrosion of the metal member according to claim 12, wherein the metal member contains nickel. ### Claim 16 A method for producing a water-based ink for inkjet recording, the method comprising: providing a refined carboxylic acid group-modified self-dispersible carbon black dispersion, wherein the refining is effective to provide an oxalate ion concentration in the water-based ink of not more than 45 ppm by weight; providing water and a water-soluble organic solvent, and mixing the refined carboxylic acid group-modified self-dispersible carbon black dispersion, water, and the water-soluble organic solvent. ### Claim 17 (depends on 16) The method for producing the water-based ink for ink-jet recording according to claim 16, wherein the carboxylic acid group-modified self-dispersible carbon black dispersion is refined by performing ultrafiltration for the carboxylic acid group-modified self-dispersible carbon black dispersion so that the oxalate ion is contained in the water-based ink in an amount of not more than 45 ppm by weight. ### Claim 18 (depends on 16) The method for producing the water-based ink for ink-jet recording according to claim 16, wherein the carboxylic acid group-modified self-dispersible carbon black dispersion is refined by refining the carboxylic acid group-modified self-dispersible carbon black dispersion so that the oxalate ion is contained in the water-based ink in an amount ranging from 1 ppm by weight to 45 ppm by weight.