# US 12,505,935 B1 · Conductive dispersion solution, resin film-forming coating material, resin film, member, and electrophotographic image forming apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,505,935 B1 - Document ID: US12505935B1 - Status: Granted - Kind: B1 - Application number: 18/796,438 - Filed: 2024-08-07 - Published: 2025-12-25 - Granted: 2025-12-23 - Earliest claimed: 2024-06-24 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Yasutomo Tsuji; Yuji Kitano; Takeshi Suzuki; Hiroomi Kojima; Masatsugu Toyonori - Web page: https://patentgrep.com/patent/US12505935B1 ## CPC - H01B 1/20: Conductive material dispersed in non-conductive organic material {(organic macromolecular compounds or compositions C08)} - C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)} - C09D 7/61: inorganic - C09D 7/63: organic - C09D 133/10: Homopolymers or copolymers of methacrylic acid esters - C09D 135/02: Homopolymers or copolymers of esters (C09D135/06, C09D135/08 take precedence) - G03G 15/162: {details of the the intermediate support, e.g. chemical composition} - G03G 15/1685: {Structure, details of the transfer member, e.g. chemical composition} - C08K 2003/2231: {of tin} - G03G 2215/1623: Transfer belt - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - 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) - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A conductive dispersion solution comprising a tin oxide particle and a dispersion medium, wherein the conductive dispersion solution further comprises an organic acid, a phosphorus compound, and an amine compound, the tin oxide particle is dispersed in the dispersion medium, a cumulant average particle diameter of the tin oxide particle in the conductive dispersion solution is 90 to 400 nm, the organic acid, the phosphorus compound, and the amine compound are dissolved in the dispersion medium, and the tin oxide particle comprises an antimony-containing tin oxide particle A not treated with a silane coupling agent and an antimony-containing tin oxide particle B treated with a silane coupling agent. ## Claims ### Claim 1 A conductive dispersion solution comprising a tin oxide particle and a dispersion medium, wherein the conductive dispersion solution further comprises an organic acid, a phosphorus compound, and an amine compound, the tin oxide particle is dispersed in the dispersion medium, a cumulant average particle diameter of the tin oxide particle in the conductive dispersion solution is 90 to 400 nm, the organic acid, the phosphorus compound, and the amine compound are dissolved in the dispersion medium, and the tin oxide particle comprises an antimony-containing tin oxide particle A not treated with a silane coupling agent and an antimony-containing tin oxide particle B treated with a silane coupling agent. ### Claim 2 (depends on 1) The conductive dispersion solution according to claim 1, wherein a proportion of a content of the tin oxide particle in the conductive dispersion solution is 5.0 to 50.0 mass %, and a content of the antimony-containing tin oxide particle A in the conductive dispersion solution with respect to a total of 100 parts by mass of the antimony-containing tin oxide particle A and the antimony-containing tin oxide particle B is 25 to 75 parts by mass. ### Claim 3 (depends on 1) The conductive dispersion solution according to claim 1, wherein when the antimony-containing tin oxide particle B comprised in the conductive dispersion solution is measured through X-ray fluorescence, a proportion of elemental silicon in all elements measured is 5.0 to 15.0 mass %. ### Claim 4 (depends on 1) The conductive dispersion solution according to claim 1, wherein a content of the organic acid with respect to 100 parts by mass of the tin oxide particle is 0.10 to 2.00 parts by mass, a content of the amine compound with respect to 100 parts by mass of the tin oxide particle is 0.25 to 1.00 parts by mass, and a content of the phosphorus compound with respect to 100 parts by mass of the tin oxide particle is 0.50 to 10.00 parts by mass. ### Claim 5 (depends on 1) The conductive dispersion solution according to claim 1, wherein a molecular weight of the amine compound is 180 to 500, and the amine compound is at least one compound selected from the group consisting of secondary amines and tertiary amines represented by formula (1): wherein, in the formula (1), R1 and R2 are each independently an aliphatic hydrocarbon group, and R3 is a hydrogen atom or an aliphatic hydrocarbon group. ### Claim 6 (depends on 1) The conductive dispersion solution according to claim 1, wherein a molecular weight of the phosphorus compound is 300 to 5,000, and the phosphorus compound is at least one compound selected from the group consisting of diesters and triesters represented by formula (2): wherein, in formula (2), R4 to R6 are a hydrogen atom or an organic group, and at least two selected from the group consisting of R4 to R6 are an organic group. ### Claim 7 (depends on 1) The conductive dispersion solution according to claim 1, wherein the dispersion medium is an organic solvent. ### Claim 8 A resin film-forming coating material comprising a resin, the coating material comprising at least one selected from the group consisting of the resin and a precursor of the resin, a tin oxide particle, an organic acid, a phosphorus compound, and an amine compound, wherein the tin oxide particle comprises an antimony-containing tin oxide particle A not treated with a silane coupling agent and an antimony-containing tin oxide particle B treated with a silane coupling agent. ### Claim 9 (depends on 8) The coating material according to claim 8, wherein the resin is a (meth)acrylic resin. ### Claim 10 (depends on 8) A resin film comprising a resin, wherein the resin film is a cured product of a coating film of the coating material according to claim 8. ### Claim 11 (depends on 8) A member comprising a substrate and a resin film comprising a resin on a surface of the substrate, wherein the resin film is a cured product of a coating film of the coating material according to claim 8. ### Claim 12 (depends on 11) The member according to claim 11, wherein the member is an electrophotographic belt having an endless belt shape. ### Claim 13 (depends on 12) An electrophotographic image forming apparatus comprising the member according to claim 12 as an intermediate transfer member.