# US 7,410,741 B2 · Toner for electrophotography and developer for electrophotography, as well as 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 7,410,741 B2 - Document ID: US7410741B2 - Status: Granted - Kind: B2 - Application number: 11/158,248 - Filed: 2005-06-22 - Published: 2006-08-31 - Granted: 2008-08-12 - Earliest claimed: 2005-02-28 - Assignees: Fuji Xerox Co., Ltd. - Inventors: Katsumi Daimon; Norihito Fukushima; Shuji Sato; Masaaki Suwabe; Kazufumi Tomita; Fumio Ojima - Web page: https://patentgrep.com/patent/US7410741B2 ## CPC - G03G 9/08755: {Polyesters} - G03G 9/08795: {characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants} - G03G 9/08797: {characterised by their physical properties, e.g. viscosity, solubility, melting temperature, softening temperature, glass transition temperature} - G03G 9/09733: {Organic compounds (G03G9/08782 takes precedence)} - G03G 21/0011: {using a blade; Details of cleaning blades, e.g. blade shape, layer forming} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A toner for electrophotography contains a binder resin and a coloring agent, and is characterized in that the binder resin contains a crystalline polyester resin, and a low-molecular compound having at least one of a naphthalene skeleton and a biphenyl skeleton, and the crystalline polyester resin contains 0.5 to 30 construction mole % of an aromatic dicarboxylic acid-derived constitutional component. Further, a developer for electrophotography and an image forming method using the toner for electrophotography are disclosed. ## Claims ### Claim 1 A toner for electrophotography comprising a binder resin and a coloring agent, characterized in that the binder resin contains a crystalline polyester resin and a low-molecular compound having a biphenyl skeleton, and the crystalline polyester resin contains 0.5 to 30 construction mole % of an aromatic dicarboxylic acid-derived constitutional component. ### Claim 2 (depends on 1) The toner for electrophotography of claim 1, wherein the low-molecular compound is a compound selected from the group represented by the following formula (1): wherein in the above formula (1), it is preferable that R1 and R2 are independently a substituent represented by “—COOR3”, “—CH2COOR4” or “—CONHR5”. It is preferable that R3, R4 and R5 are independently hydrogen, an alkyl group of C1 to C12. ### Claim 3 (depends on 1) The toner for electrophotography of claim 1, wherein the low-molecular compound is a compound selected from the group consisting of biphenyl, 4-biphenylacetic acid, 4-biphenylcarbonitrile, 4-biphenylcarboxylic acid, 4,4′-biphenyldicarboxylic acid, and alkyl esters thereof. ### Claim 4 (depends on 1) The toner for electrophotography of claim 1, wherein the low-molecular compound is contained at 1 to 12 parts by mass relative to 100 parts by mass of the crystalline polyester resin. ### Claim 5 (depends on 1) The toner for elctrophotography of claim 1, wherein the crystalline polyester resin contains two or more kinds of dicarboxylic acid-derived constitutional components. ### Claim 6 (depends on 1) The toner for electrophotography of claim 1, wherein the crystalline polyester resin contains an aliphatic dicarboxylic acid-derived constitutional component and an aromatic dicarboxylic acid-derived constitutional component as acid-derived constitutional components. ### Claim 7 (depends on 6) The toner for electrophotography of claim 6, wherein the aliphatic dicarboxylic acid-derived constitutional component is a straight-chain dicarboxylic acid-derived constitutional component. ### Claim 8 (depends on 1) The toner for electrophotography of claim 1, wherein the crystalline polyester resin contains a dicarboxylic acid-derived constitutional component having a double bond or a dicarboxylic acid-derived constitutional component having a sulfonic acid group as an acid-derived constitutional component. ### Claim 9 (depends on 8) The toner for electrophotography of claim 8, wherein the dicarboxylic acid-derived constitutional component having a double bond is 2 to 10 constitutional mole % of all acid-derived constitutional components. ### Claim 10 (depends on 1) The toner for electrophotography of claim 1, wherein the crystalline polyester resin contains an aliphatic diol-derived constitutional component as an alcohol-derived constitutional component. ### Claim 11 (depends on 10) The toner for electrophotography of claim 10, wherein the aliphatic diol-derived constitutional component contains a diol-derived constitutional component having a double bond. ### Claim 12 (depends on 10) The toner for electrophotography of claim 10, wherein the aliphatic diol-derived constitutional component is 80 construction mole % or more of an alcohol-derived constitutional component. ### Claim 13 (depends on 10) The toner for electrophotography of claim 10, wherein the aliphatic diol-derived constitutional component is a stright-chain aliphatic diol-derived constitutional component. ### Claim 14 (depends on 1) A developer for electrophotography comprising a toner for electrophotography and a carrier, characterized in that the toner for electrophotography is a toner for electrophotography as defined in claim 1. ### Claim 15 (depends on 1) An image forming method, comprising forming an electrostatic latent image on a surface of a latent image retaining body, developing the electrostatic latent image with a developer to form a toner image, transferring the toner image formed on the surface of the latent image retaining body onto a recording material to form a transferred image, and fixing the transferred image transferred onto the recording material, wherein the developer contains a toner for electrophotography as defined in claim 1. ### Claim 16 (depends on 15) The image forming method of claim 15, wherein the thickness of an electrically conductive substrate of the latent image retaining body is not less than 1.4 mm and not more than 2.2 mm. ### Claim 17 (depends on 15) The image forming method of claim 15, further comprising cleaning to remove a toner remaining on the surface of the latent image retaining body. ### Claim 18 (depends on 17) The image forming method of claim 17, wherein cleaning means is retained by a supporting member, and contains an elastic blade abutted against a surface of the latent image retaining body at an abutting pressure of a linear pressure of not less than 20 g/cm and not more than 40 g/cm. ### Claim 19 (depends on 17) The image forming method of claim 17, wherein an elastic blade is abutted against a surface of the latent image retaining body at an abutting angle of not less than 9° and not more than 17°.