# US 2024/0201610 A1 · Electrostatic charge image developing toner, electrostatic charge image developer, toner cartridge, process cartridge, image forming apparatus, and image forming method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0201610 A1 - Document ID: US20240201610A1 - Status: Published application - Kind: A1 - Application number: 18/316,246 - Filed: 2023-05-12 - Published: 2024-06-20 - Earliest claimed: 2022-12-01 - Assignees: FUJIFILM Business Innovation Corp. - Applicants: FUJIFILM Business Innovation Corp. - Inventors: Erina SAITO; Tomohito NAKAJIMA; Daisuke ISHIZUKA; Tsutomu FURUTA - Web page: https://patentgrep.com/patent/US20240201610A1 ## CPC - G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature} - G03G 9/0819: {characterised by the dimensions of the particles} - G03G 9/0821: {characterised by physical parameters (magnetic parameters G03G9/083)} - G03G 9/0825: {characterised by their structure; characterised by non-homogenuous distribution of components (microcapsular toners G03G9/093)} - G03G 9/087: Binders for toner particles - G03G 9/08711: {with esters of acrylic or methacrylic acid} - G03G 9/08755: {Polyesters} - G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An electrostatic charge image developing toner contains toner particles that contain a binder resin containing an amorphous resin and a crystalline resin and resin particles, in which the electrostatic charge image developing toner satisfies the following Condition (1) and Condition (2). Condition (1): in a case where dynamic viscoelasticity of the toner particles is measured, a temperature T0 at which a complex viscosity η* of the toner particles is 1.0×107 Pa·s is 50° C. or lower, Condition (2): in a case where dynamic viscoelasticity of the resin particles is measured, a complex viscosity η* of the resin particles at the temperature T0 is 1.0×104 Pa·s or more, and ΔA calculated by the following Equation (1) is 0.2 or more. Equation (1): ΔA=|Logη*(T0+5)−Logη*(T0−5)|, in Equation (1), η*(T0+5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. higher than the temperature T0, and η*(T0−5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. lower than the temperature T0. ## Claims ### Claim 1 An electrostatic charge image developing toner comprising: toner particles that contain a binder resin containing an amorphous resin and a crystalline resin and resin particles, wherein the electrostatic charge image developing toner satisfies the following Condition (1) and Condition (2), Condition (1): in a case where dynamic viscoelasticity of the toner particles is measured, a temperature T0 at which a complex viscosity η* of the toner particles is 1.0×107 Pa·s is 50° C. or lower, Condition (2): in a case where dynamic viscoelasticity of the resin particles is measured, a complex viscosity η* of the resin particles at the temperature T0 is 1.0×104 Pa·s or more, and ΔA calculated by the following Equation (1) is 0.2 or more, ΔA=|Logη*(T0+5)−Logη*(T0−5)|, Equation (1) in Equation (1), η*(T0+5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. higher than the temperature T0, and η*(T0−5) is a complex viscosity (unit: Pa·s) at a temperature 5° C. lower than the temperature T0. ### Claim 2 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein the amorphous resin includes an amorphous polyester resin, the crystalline resin includes a crystalline polyester resin, and a mass ratio of the crystalline polyester resin to a total of the amorphous polyester resin and the crystalline polyester resin is 5% by mass or more and 40% by mass or less. ### Claim 3 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein the amorphous resin includes an amorphous polyester resin, the amorphous polyester resin includes an amorphous polyester resin having an aliphatic dicarboxylic acid unit, and a mass ratio of the aliphatic dicarboxylic acid unit to all dicarboxylic acid units in the entire amorphous polyester resin is 1% by mass or more and 30% by mass or less. ### Claim 4 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein the resin particles are crosslinked resin particles. ### Claim 5 (depends on 4) The electrostatic charge image developing toner according to claim 4, wherein the resin configuring the crosslinked resin particles is a crosslinked vinyl-based resin having a crosslinked structure derived from at least one difunctional (meth)acrylate selected from the group consisting of a compound represented by the following Formula (A), a compound represented by the following Formula (B), and a compound represented by the following Formula (C), in Formula (A), R1 and R2 each independently represent a hydrogen atom or a methyl group, and n is an integer of 4 or more and 20 or less, in Formula (B), R3 and R4 each independently represent a hydrogen atom or a methyl group, p is an integer of 2 or more and 4 or less, and q is an integer of 3 or more and 20 or less, in Formula (C), R5 and R6 each independently represent a hydrogen atom or a methyl group, and r is an integer of 2 or more and 20 or less. ### Claim 6 (depends on 4) The electrostatic charge image developing toner according to claim 4, wherein the crosslinked resin particles are crosslinked styrene (meth)acrylic resin particles. ### Claim 7 (depends on 4) The electrostatic charge image developing toner according to claim 4, wherein in a case where dynamic viscoelasticity of the crosslinked resin particles is measured, a storage modulus G′ at a temperature 100° C. higher than the temperature T0 is 1.0×104 Pa or more. ### Claim 8 (depends on 4) The electrostatic charge image developing toner according to claim 4, wherein a mass ratio of the crosslinked resin particles to the toner particles is 1% by mass or more and 30% by mass or less. ### Claim 9 (depends on 4) The electrostatic charge image developing toner according to claim 4, wherein in a case where Dt (μm) represents a volume-average particle size of the toner particles, and a region from a surface of the toner particles to a depth (Dt/5) μm is defined as a surface layer portion, a ratio of a total area of the crosslinked resin particles contained in the surface layer portion to a total area of the surface layer portion is 3% or more and 20% or less in observation of cross sections of the toner particles. ### Claim 10 (depends on 4) The electrostatic charge image developing toner according to claim 4, wherein an average particle size of the crosslinked resin particles is 100 nm or more and 300 nm or less in observation of cross sections of the toner particles. ### Claim 11 (depends on 4) The electrostatic charge image developing toner according to claim 4, wherein the toner particles further contain a release agent, and a ratio Ww/Wp of a content Ww of the release agent contained in the toner particles to a content Wp of the crosslinked resin particles is 0.03 or more and 10 or less. ### Claim 12 (depends on 1) The electrostatic charge image developing toner according to claim 1, wherein the toner particles further contain a release agent, and in a case where Dt (μm) represents a volume-average particle size of the toner particles, and a region from a surface of the toner particles to a depth (Dt/5) μm is defined as a surface layer portion, a ratio of a total area of the release agent contained in the surface layer portion to a total area of the surface layer portion is 1% or more and 20% or less in observation of cross sections of the toner particles. ### Claim 13 (depends on 1) The electrostatic charge image developing toner according to claim 1, further comprising: an external additive added to an exterior of the toner particles, wherein the external additive includes inorganic particles. ### Claim 14 (depends on 1) The electrostatic charge image developing toner according to claim 1, further comprising: an external additive added to an exterior of the toner particles, wherein an average particle size of the external additive is 50 nm or more and 500 nm or less. ### Claim 15 (depends on 1) The electrostatic charge image developing toner according to claim 1, further comprising: an external additive added to an exterior of the toner particles, wherein a content of the external additive is 0.3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the toner particles. ### Claim 16 (depends on 1) An electrostatic charge image developer comprising: the electrostatic charge image developing toner according to claim 1. ### Claim 17 (depends on 1) A toner cartridge comprising: a container that contains the electrostatic charge image developing toner according to claim 1, wherein the toner cartridge is detachable from an image forming apparatus. ### Claim 18 (depends on 16) A process cartridge comprising: a developing unit that contains the electrostatic charge image developer according to claim 16 and develops an electrostatic charge image formed on a surface of an image holder as a toner image by using the electrostatic charge image developer, wherein the process cartridge is detachable from an image forming apparatus. ### Claim 19 (depends on 16) An image forming apparatus comprising: an image holder; a charging unit that charges a surface of the image holder; an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holder; a developing unit that contains the electrostatic charge image developer according to claim 16 and develops the electrostatic charge image formed on the surface of the image holder as a toner image by using the electrostatic charge image developer; a transfer unit that transfers the toner image formed on the surface of the image holder to a surface of a recording medium; and a fixing unit that fixes the toner image transferred to the surface of the recording medium. ### Claim 20 (depends on 16) An image forming method comprising: charging a surface of an image holder; forming an electrostatic charge image on the charged surface of the image holder; developing the electrostatic charge image formed on the surface of the image holder as a toner image by using the electrostatic charge image developer according to claim 16; transferring the toner image formed on the surface of the image holder to a surface of a recording medium; and fixing the toner image transferred to the surface of the recording medium.