# US 2015/0147693 A1 · Method of producing electrophotographic photosensitive member > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0147693 A1 - Document ID: US20150147693A1 - Status: Published application - Kind: A1 - Application number: 14/405,139 - Filed: 2013-05-22 - Published: 2015-05-28 - Earliest claimed: 2012-06-04 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Keiko Yamagishi; Harunobu Ogaki; Kimihiro Yoshimura; Hiroki Uematsu; Yohei Miyauchi; Atsushi Okuda - Web page: https://patentgrep.com/patent/US20150147693A1 ## CPC - G03G 5/0629: {containing one hetero atom} - G03G 5/043: Photoconductive layers characterised by having two or more layers or characterised by their composite structure - G03G 5/05: Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers - G03G 5/0514: {not comprising cyclic groups} - G03G 5/0525: {Coating methods} - G03G 5/0616: {Hydrazines; Hydrazones} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract The invention has a process of preparing a dispersion liquid by dispersing particles containing a charge transporting substance and a binder resin in liquid medium containing a specific liquid to prepare a dispersion liquid and a process of forming a coat of the dispersion liquid, and heating and drying the coat to dissolve the particles containing the charge transporting substance and the binder resin with liquid medium to form a charge transporting layer. ## Claims ### Claim 1 A method of producing an electrophotographic photosensitive member which comprises a support and a charge transporting layer formed thereon, comprising the steps of: preparing a dispersion liquid comprising: particles comprising a charge transporting substance and a binder resin, and liquid medium; forming a coat of the dispersion liquid; heating the coat to dissolve the particles with liquid medium; and drying the coat to form the charge transporting layer; wherein liquid medium comprises at least one selected from the group consisting of propylene glycol monopropyl ether, propylene glycol-n-butyl ether, 3,3-dimethyl-1-hexanol, ethyl acetyl lactate, 2,2,4-trimethyl-1-pentanol, 2-methyl-2-ethyl-1-pentanol, ethylene glycol monoethyl ether acrylate, butyl formate, phenetole, diethylene glycol dimethyl ether, and methyl propylene glycol acetate. ### Claim 2 A method of producing an electrophotographic photosensitive member which comprises a support and a charge transporting layer formed thereon, comprising the steps of: preparing a dispersion liquid comprising: particles comprising a charge transporting substance, particles comprising a binder resin, and liquid medium; forming a coat of the dispersion liquid; heating the coat to dissolve the particles comprising the charge transporting substance and the particles comprising the binder resin with liquid medium; and drying the coat to form the charge transporting layer; wherein liquid medium comprises at least one selected from the group consisting of propylene glycol monopropyl ether, propylene glycol-n-butyl ether, 3,3-dimethyl-1-hexanol, ethyl acetyl lactate, 2,2,4-trimethyl-1-pentanol, 2-methyl-2-ethyl-1-pentanol, ethylene glycol monoethyl ether acrylate, butyl formate, phenetole, diethylene glycol dimethyl ether, and methyl propylene glycol acetate. ### Claim 3 (depends on 1) The method of producing an electrophotographic photosensitive member according to claim 1, wherein the binder resin is a polycarbonate resin or a polyester resin. ### Claim 4 (depends on 1) The method of producing an electrophotographic photosensitive member according to claim 1, wherein the charge transporting substance is a triarylamine compound. ### Claim 5 (depends on 1) The method of producing an electrophotographic photosensitive member according to claim 1, wherein liquid medium further comprises water. ### Claim 6 A method of producing an electrophotographic photosensitive member which comprises a support and a charge transporting layer formed thereon, comprising the steps of: preparing a dispersion liquid comprising: particles comprising a charge transporting substance and a the binder resin, and liquid medium; forming a coat of the dispersion liquid; heating the coat at a temperature at which a difference between an SP value of the charge transporting substance and the SP value of a liquid whose boiling point under one atmospheric pressure is the highest among liquids contained in liquid medium is 6.8 or lower to dissolve the particles with liquid medium; and drying the coat to form the charge transporting layer; wherein a difference between the SP value of the charge transporting substance and the SP value of liquid medium at 25° C. under one atmospheric pressure is 7.5 or more. ### Claim 7 A method of producing an electrophotographic photosensitive member which comprises a support and a charge transporting layer formed thereon, comprising the steps of: preparing a dispersion liquid comprising: particles comprising a charge transporting substance, particles comprising a the binder resin, and liquid medium; forming a coat of the dispersion liquid; heating the coat at a temperature at which a difference between an SP value of the charge transporting substance and the SP value of a liquid whose boiling point under one atmospheric pressure is the highest among liquids contained in liquid medium is 6.8 or lower to dissolve the particles comprising the charge transporting substance and the particles comprising the binder resin with liquid medium; and drying the coat to form the charge transporting layer; wherein a difference between the SP value of the charge transporting substance and the SP value of liquid medium at 25° C. under one atmospheric pressure is 7.5 or more. ### Claim 8 (depends on 6) The method of producing an electrophotographic photosensitive member according to claim 6, wherein the liquid whose boiling point under one atmospheric pressure is the highest is at least one liquid selected from the group consisting of propylene glycol monopropyl ether, propylene glycol-n-butyl ether, 3,3-dimethyl-1-hexanol, ethyl acetyl lactate, 2,2,4-trimethyl-1-pentanol, 2-methyl-2-ethyl-1-pentanol, ethylene glycol monoethyl ether acrylate, butyl formate, phenetole, diethylene glycol dimethyl ether, and methyl propylene glycol acetate. ### Claim 9 (depends on 6) The method of producing an electrophotographic photosensitive member according to claim 6, wherein the binder resin is a polycarbonate resin or a polyester resin. ### Claim 10 (depends on 6) The method of producing an electrophotographic photosensitive member according to claim 6, wherein the charge transporting substance is a triarylamine compound. ### Claim 11 (depends on 6) The method of producing an electrophotographic photosensitive member according to claim 6, wherein liquid medium further comprises water. ### Claim 12 (depends on 2) The method of producing an electrophotographic photosensitive member according to claim 2, wherein the binder resin is a polycarbonate resin or a polyester resin. ### Claim 13 (depends on 2) The method of producing an electrophotographic photosensitive member according to claim 2, wherein the charge transporting substance is a triarylamine compound. ### Claim 14 (depends on 2) The method of producing an electrophotographic photosensitive member according to claim 2, wherein liquid medium further comprises water. ### Claim 15 (depends on 7) The method of producing an electrophotographic photosensitive member according to claim 7, wherein the liquid whose boiling point under one atmospheric pressure is the highest is at least one liquid selected from the group consisting of propylene glycol monopropyl ether, propylene glycol-n-butyl ether, 3,3-dimethyl-1-hexanol, ethyl acetyl lactate, 2,2,4-trimethyl-1-pentanol, 2-methyl-2-ethyl-1-pentanol, ethylene glycol monoethyl ether acrylate, butyl formate, phenetole, diethylene glycol dimethyl ether, and methyl propylene glycol acetate. ### Claim 16 (depends on 7) The method of producing an electrophotographic photosensitive member according to claim 7, wherein the binder resin is a polycarbonate resin or a polyester resin. ### Claim 17 (depends on 7) The method of producing an electrophotographic photosensitive member according to claim 7, wherein the charge transporting substance is a triarylamine compound. ### Claim 18 (depends on 7) The method of producing an electrophotographic photosensitive member according to claim 7, wherein liquid medium further comprises water.