# US 2018/0022926 A1 · Method for producing oxidized carbon black aqueous dispersion, and method for producing oxidized carbon black aqueous dispersion for inkjet ink > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022926 A1 - Document ID: US20180022926A1 - Status: Published application - Kind: A1 - Application number: 15/547,244 - Filed: 2016-01-20 - Published: 2018-01-25 - Earliest claimed: 2015-01-30 - Assignees: Tokai Carbon Co., Ltd. - Applicants: Tokai Carbon Co., Ltd. - Inventors: Takuya Sakoda; Yoshihiro Sato - Web page: https://patentgrep.com/patent/US20180022926A1 ## CPC - C09C 1/565: {comprising an oxidative treatment with oxygen, ozone or oxygenated compounds, e.g. when such treatment occurs in a region of the furnace next to the carbon black generating reaction zone} - B41J 2/01: Ink jet - B41M 5/00: Duplicating or marking methods; Sheet materials for use therein (by using light-sensitive materials G03; electrography, magnetography G03G {; repeatedly usable boards or tablets for writing or drawing B43L1/00}) - C09D 11/324: containing carbon black - C09D 17/00: Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06) - C09D 17/005: {Carbon black} - C01P 2004/51: Particles with a specific particle size distribution - C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer - C01P 2006/22: Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability - C01P 2006/40: Electric properties - C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - 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) - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS ## Abstract Provided is a method for easily producing an oxidized carbon black aqueous dispersion that can highly remove multivalent metal ions and exhibit excellent dispersion stability. A method for producing an oxidized carbon black aqueous dispersion by successively performing on an aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof a neutralization step of mixing an alkali metal hydroxide and performing heating/neutralization in the presence of one or more selected from a water-soluble chelating agent and a salt thereof or after mixing an alkali metal hydroxide and performing heating/neutralization, mixing one or more selected from a water-soluble chelating agent and a salt thereof and a separation and removal step of separating and removing a multivalent metal ion chelate complex from a mixed solution obtained at the neutralization step using a separation membrane. ## Claims ### Claim 1 A method for producing an oxidized carbon black aqueous dispersion by successively performing on an aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof: a neutralization step of mixing an alkali metal hydroxide and performing heating/neutralization in the presence of one or more selected from a water-soluble chelating agent and a salt thereof or after mixing an alkali metal hydroxide and performing heating/neutralization, mixing one or more selected from a water-soluble chelating agent and a salt thereof; and a separation and removal step of separating and removing a multivalent metal ion chelate complex from a mixed solution obtained at the neutralization step using a separation membrane. ### Claim 2 (depends on 1) The method for producing an oxidized carbon black aqueous dispersion according to claim 1, wherein at the neutralization step, the alkali metal hydroxide is mixed with the aqueous slurry of oxidized carbon black so that a pH of the mixture is 6 to 12. ### Claim 3 (depends on 1) The method for producing an oxidized carbon black aqueous dispersion according to claim 1, wherein the water-soluble chelating agent is an aminocarboxylic acid and a salt thereof. ### Claim 4 (depends on 2) The method for producing an oxidized carbon black aqueous dispersion according to claim 2, wherein the water-soluble chelating agent is an aminocarboxylic acid and a salt thereof. ### Claim 5 (depends on 1) The method for producing an oxidized carbon black aqueous dispersion according to claim 1, wherein the aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof is obtained by subjecting carbon black to oxidation treatment by a liquid phase method, mixing the carbon black with one or more selected from a water-soluble chelating agent and a salt thereof under a condition of pH 2 to pH 4, and then preliminarily separating multivalent metal ions using a separation membrane. ### Claim 6 (depends on 2) The method for producing an oxidized carbon black aqueous dispersion according to claim 2, wherein the aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof is obtained by subjecting carbon black to oxidation treatment by a liquid phase method, mixing the carbon black with one or more selected from a water-soluble chelating agent and a salt thereof under a condition of pH 2 to pH 4, and then preliminarily separating multivalent metal ions using a separation membrane. ### Claim 7 (depends on 3) The method for producing an oxidized carbon black aqueous dispersion according to claim 3, wherein the aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof is obtained by subjecting carbon black to oxidation treatment by a liquid phase method, mixing the carbon black with one or more selected from a water-soluble chelating agent and a salt thereof under a condition of pH 2 to pH 4, and then preliminarily separating multivalent metal ions using a separation membrane. ### Claim 8 (depends on 1) The method for producing an oxidized carbon black aqueous dispersion according to claim 1, wherein the separation membrane is an ultrafiltration membrane (UF), a reverse osmosis membrane (RO), or an electrodialysis membrane. ### Claim 9 (depends on 2) The method for producing an oxidized carbon black aqueous dispersion according to claim 2, wherein the separation membrane is an ultrafiltration membrane (UF), a reverse osmosis membrane (RO), or an electrodialysis membrane. ### Claim 10 (depends on 3) The method for producing an oxidized carbon black aqueous dispersion according to claim 3, wherein the separation membrane is an ultrafiltration membrane (UF), a reverse osmosis membrane (RO), or an electrodialysis membrane. ### Claim 11 (depends on 1) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 1 to remove a coarse grain component. ### Claim 12 (depends on 2) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 2 to remove a coarse grain component. ### Claim 13 (depends on 3) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 3 to remove a coarse grain component. ### Claim 14 (depends on 4) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 4 to remove a coarse grain component. ### Claim 15 (depends on 5) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 5 to remove a coarse grain component. ### Claim 16 (depends on 6) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 6 to remove a coarse grain component. ### Claim 17 (depends on 7) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 7 to remove a coarse grain component. ### Claim 18 (depends on 8) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 8 to remove a coarse grain component. ### Claim 19 (depends on 9) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 9 to remove a coarse grain component. ### Claim 20 (depends on 10) A method for producing a carbon black aqueous dispersion for an inkjet ink composition performing centrifugal separation treatment on an oxidized carbon black aqueous dispersion obtained by the method according to claim 10 to remove a coarse grain component.