# US 12,111,613 B2 · Preparing method of electrostatic charge image developing toner and electrostatic charge image developing toner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,111,613 B2 - Document ID: US12111613B2 - Status: Granted - Kind: B2 - Application number: 17/373,915 - Filed: 2021-07-13 - Published: 2022-09-22 - Granted: 2024-10-08 - Earliest claimed: 2021-03-22 - Assignees: FUJIFILM Business Innovation Corp. - Applicants: FUJIFILM Business Innovation Corp. - Inventors: Yuta Saeki; Atsushi Sugawara; Daisuke Noguchi; Kazuhiko Nakamura; Hiroshi Nakazawa - Web page: https://patentgrep.com/patent/US12111613B2 ## CPC - G03G 9/0804: {whereby the components are brought together in a liquid dispersing medium} - G03G 9/0823: {Electric parameters} - G03G 9/087: Binders for toner particles - G03G 9/08755: {Polyesters} - G03G 9/08782: {Waxes} - G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A preparing method of an electrostatic charge image developing toner includes: aggregating at least binder resin particles and release agent particles contained in a dispersion to form aggregated particles; heating and coalescing the aggregated particles to form coalesced particles; and filtering and cleaning the coalesced particles to obtain toner particles, in which before the aggregating or during the aggregating, a polymer dispersant is added to the dispersion in an amount of 0.01% by weight or more and 1.3% by weight or less with respect to a total weight of the obtained toner particles. ## Claims ### Claim 1 A preparing method of an electrostatic charge image developing toner, the method comprising: aggregating at least binder resin particles and release agent particles contained in a dispersion to form aggregated particles; heating and coalescing the aggregated particles to form coalesced particles; and filtering and cleaning the coalesced particles to obtain toner particles, wherein before the aggregating or during the aggregating, a polymer dispersant is added to the dispersion in an amount of 0.01% by weight or more and 1.3% by weight or less with respect to a total weight of the obtained toner particles, the polymer dispersant is added to the dispersion as an aqueous solution comprising 1% by weight to 40% by weight of the polymer dispersant, the aqueous solution comprises 5% by weight or more and 40% by weight or less of the polymer dispersant, and the polymer dispersant is at least one compound selected from the group consisting of a formalin condensate sulfonate, a salt of an α-olefin-maleic acid copolymer, and a salt of a styrene-maleic acid copolymer. ### Claim 2 (depends on 1) The preparing method of an electrostatic charge image developing toner according to claim 1, wherein the polymer dispersant is the formalin condensate sulfonate. ### Claim 3 (depends on 1) The preparing method of an electrostatic charge image developing toner according to claim 1, wherein before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.03% by weight or more and 1.3% by weight or less with respect to the total weight of the obtained toner particles. ### Claim 4 (depends on 2) The preparing method of an electrostatic charge image developing toner according to claim 2, wherein before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.03% by weight or more and 1.3% by weight or less with respect to the total weight of the obtained toner particles. ### Claim 5 (depends on 3) The preparing method of an electrostatic charge image developing toner according to claim 3, wherein before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.05% by weight or more and 1.0% by weight or less with respect to the total weight of the obtained toner particles. ### Claim 6 (depends on 4) The preparing method of an electrostatic charge image developing toner according to claim 4, wherein before the aggregating or during the aggregating, the polymer dispersant is added to the dispersion in an amount of 0.05% by weight or more and 1.0% by weight or less with respect to the total weight of the obtained toner particles. ### Claim 7 (depends on 1) The preparing method of an electrostatic charge image developing toner according to claim 1, wherein in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower. ### Claim 8 (depends on 2) The preparing method of an electrostatic charge image developing toner according to claim 2, wherein in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower. ### Claim 9 (depends on 3) The preparing method of an electrostatic charge image developing toner according to claim 3, wherein in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower. ### Claim 10 (depends on 4) The preparing method of an electrostatic charge image developing toner according to claim 4, wherein in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower. ### Claim 11 (depends on 5) The preparing method of an electrostatic charge image developing toner according to claim 5, wherein in the aggregating, a solid content concentration of the dispersion is 11% by weight or higher and 20% by weight or lower. ### Claim 12 (depends on 1) The preparing method of an electrostatic charge image developing toner according to claim 1, wherein the aqueous solution is added before the aggregating or during the aggregating. ### Claim 13 (depends on 1) The preparing method of an electrostatic charge image developing toner according to claim 1, wherein the polymer dispersant is a salt of an α-olefin-maleic acid copolymer.