# US 11,029,617 B2 · White toner and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,617 B2 - Document ID: US11029617B2 - Status: Granted - Kind: B2 - Application number: 16/815,355 - Filed: 2020-03-11 - Published: 2020-09-24 - Granted: 2021-06-08 - Earliest claimed: 2019-03-18 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Yuya Chimoto; Kouichirou Ochi; Hayato Ida - Web page: https://patentgrep.com/patent/US11029617B2 ## CPC - G03G 9/09791: {Metallic soaps of higher carboxylic acids} - G03G 9/081: {by mixing the toner components in a liquefied state; melt kneading; reactive mixing} - G03G 9/0821: {characterised by physical parameters (magnetic parameters G03G9/083)} - G03G 9/08755: {Polyesters} - G03G 9/0902: {Inorganic compounds} - G03G 9/09716: {treated with organic compounds} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A white toner comprising a toner particle including a binder resin, an inorganic white pigment, and a polyvalent metal salt compound, wherein the inorganic white pigment has an acidic group at a surface thereof; an amount of the inorganic white pigment in the toner particle is 10% to 50% by volume; the polyvalent metal salt compound is a specific compound; an absolute value of the difference between an SP value (J/cm3)1/2 of the binder resin and that of the polyvalent metal salt compound is 0.0 to 6.0; and an amount of the polyvalent metal salt compound, an amount of a polyvalent metal, the amount of the inorganic white pigment, and an amount of the acidic group at a surface of the inorganic white pigment satisfy a specific relationship. ## Claims ### Claim 1 A white toner comprising a toner particle that includes a binder resin, an inorganic white pigment and a polyvalent metal salt compound, wherein the inorganic white pigment has an acidic group at a surface thereof, and a volume amount of the inorganic white pigment in the toner particle is 10% by volume to 50% by volume; the polyvalent metal salt compound is at least one selected from the group consisting of compounds represented by following formulae (1) and (2): in the formula (1), R1 is each independently an organic group having from 6 to 40 carbon atoms, M1 is a divalent metal, X1 is a hydroxyl group or a halogen group, p1 represents an integer of 1 to 2, and q1 represents an integer of 0 to 1, in the formula (2), R2 is each independently an organic group having 6 to 40 carbon atoms, M2 is a trivalent metal, X2 is each independently a hydroxyl group or a halogen group, p2 represents an integer of 1 to 3, and q2 represents an integer of 0 to 2, an absolute value of the difference between an SP value (J/cm3)1/2 of the binder resin and the SP value (J/cm3)1/2 of the polyvalent metal salt compound is 0.0 to 6.0; wherein when an amount of the polyvalent metal salt compound in the toner particle is denoted by Wa (% by mass), an amount of a polyvalent metal in the polyvalent metal salt compound is denoted by Ma (μmol/g), a mass amount of the inorganic white pigment in the toner particle is denoted by Wp (% by mass), and an amount of the acidic group at the surface of the inorganic white pigment is denoted by Ap (μmol/g), the following is satisfied: 0.1≤(Wa×Ma)/(Wp×Ap)≤2.0. ### Claim 2 (depends on 1) The white toner according to claim 1, wherein the polyvalent metal salt compound is at least one selected from the group consisting of compounds represented by following formulas (3) and (4): in the formula (3), R3 is each independently an unsubstituted or hydroxy-substituted alkyl group having 8 to 30 carbon atoms, or a phenyl group unsubstituted or substituted with an alkyl group having 1 to 8 carbon atoms, A3 is each independently —C(═O)O— or —S(═O)2O—, M3 is a divalent metal, X3 is a hydroxyl group or a halogen group, p3 represents an integer of 1 to 2, and q3 represents an integer of 0 to 1, in the formula (4), R4 is each independently an unsubstituted or hydroxyl-substituted alkyl group having 8 to 30 carbon atoms or a phenyl group unsubstituted or substituted with an alkyl group having 1 to 8 carbon atoms, A4 is each independently —C(═O)O— or —S(═O)2O—, M4 is a trivalent metal, X4 is each independently a hydroxyl group or a halogen group, p4 represents an integer of 1 to 3, and q4 represents an integer of 0 to 2. ### Claim 3 (depends on 1) The white toner according to claim 1, wherein the SP value (J/cm3)1/2 of the polyvalent metal salt compound is 15.0 to 30.0. ### Claim 4 (depends on 1) The white toner according to claim 1, wherein the polyvalent metal salt compound is a fatty acid metal salt. ### Claim 5 (depends on 1) The white toner according to claim 1, wherein the binder resin includes a polyester resin. ### Claim 6 (depends on 5) The white toner according to claim 5, wherein an amount of a structure in which a propylene oxide adduct of bisphenol A is condensed in a structure in which a dialcohol component contained in the polyester resin is condensed is 50% by mass to 100% by mass. ### Claim 7 (depends on 1) The white toner according to claim 1, wherein the inorganic white pigment includes titanium oxide. ### Claim 8 (depends on 1) The white toner according to claim 1, wherein the inorganic white pigment includes calcium titanate. ### Claim 9 (depends on 1) The white toner according to claim 1, wherein the polyvalent metal salt compound includes a fatty acid aluminum salt. ### Claim 10 (depends on 1) The white toner according to claim 1, wherein the polyvalent metal salt compound includes at least one selected from the group consisting of hydroxyaluminum distearate and hydroxyaluminum dilaurate. ### Claim 11 (depends on 1) The white toner according to claim 1, wherein the toner is a melt-kneaded pulverized toner. ### Claim 12 (depends on 1) A method for producing the white toner according to claim 1, comprising the steps of: melt-kneading a mixture including the binder resin, the inorganic white pigment, and the polyvalent metal salt compound to obtain a melt-kneaded product, and pulverizing the obtained melt-kneaded product to obtain the toner particle.