Abstract: An electrostatic image developing toner including: a toner matrix particle having an adhering particle adhered onto the surface of a central particle, wherein a volume average value of a ratio X of a peripheral length PM to a circle-corresponding diameter D is from 3.6 to 5.0.

Abstract: A toner for electrostatic charge image development, the toner includes a binder resin, the binder resin includes an amorphous polyester resin having alkenyl groups and a crystalline polyester resin, about 5% or more of the alkenyl groups have a branched structure, and the o crystalline polyester resin has an ester concentration (M) obtained by the following Equation of from about 0.04 to about 0.08: M=K/A??Equation wherein, K represents the number of ester bonds in the crystalline polyester resin, and A represents the number of atoms that constitute the polymer chain of the crystalline polyester resin.

Abstract: An embodiment of the present invention provides an electrostatic image developing toner including a binder resin containing amorphous polyester resin containing a tin-containing catalyst and crystalline polyester resin containing a titanium-containing catalyst, and a colorant and a releasing agent, an electrostatic image developer using the same, a toner cartridge, a process cartridge, and an image forming apparatus.

Abstract: A toner for developing an electrostatic charge image, the toner including a binder resin containing a crystalline polyester resin and a noncrystalline polyester resin, a colorant, a releasing agent, a ketone solvent, and an alcoholic solvent, the total concentration of the ketone solvent and the alcoholic solvent in the toner dispersion liquid being less than about 10 ppm when 0.5 g of the toner is dispersed in 2 g of deionized water to form a toner dispersion liquid, and the total concentration of the ketone solvent and the alcoholic solvent in the toner dispersion liquid being from about 2 ppm to about 50 ppm when 0.5 g of the toner is dispersed in 2 g of N,N-dimethylformamide to form a toner dispersion liquid.

Abstract: An electrophotographic toner that includes a colorant, a release agent, a non-crystalline resin and a crystalline resin, wherein the crystalline resin is a polyalkyl acrylate or polyalkyl methacrylate having an alkyl group of approximately 18 or more carbon atoms, and is produced by copolymerization with approximately 10 mol % or more, but no more than approximately 50 mol %, of a vinyl monomer having a carboxyl group.

Abstract: An embodiment of the present invention provides an electrostatic image developing toner including a binder resin containing amorphous polyester resin containing a tin-containing catalyst and crystalline polyester resin containing a titanium-containing catalyst, and a colorant and a releasing agent, an electrostatic image developer using the same, a toner cartridge, a process cartridge, and an image forming apparatus.

Abstract: An electrostatic latent image developing toner including, as a binder resin, a crystalline resin and at least one kind of non-crystalline resin, wherein, in a dynamic viscoelasticity measurement by a sine wave vibration method, a minimum value of the relaxation elasticity H in a relaxation spectrum obtained from frequency dispersion characteristics measured at temperatures of 60 and 80 degrees centigrade with a measurement frequency set in the range of 0.1 to 100 rad/sec and measurement strain set in the range of 0.02 to 4.5% is in the range of 10 to 900 Pa/cm2, and a relaxation time ? corresponding to the minimum value is in the range of 1 to 10,000 sec.

Abstract: An electrophotographic toner that includes a colorant, a release agent, a non-crystalline resin and a crystalline resin, wherein the crystalline resin is a polyalkyl acrylate or polyalkyl methacrylate having an alkyl group of approximately 18 or more carbon atoms, and is produced by copolymerization with approximately 10 mol % or more, but no more than approximately 50 mol %, of a vinyl monomer having a carboxyl group.

Abstract: An electrostatic latent image developing toner including, as a binder resin, a crystalline resin and at least one kind of non-crystalline resin, wherein, in a dynamic viscoelasticity measurement by a sine wave vibration method, a minimum value of the relaxation elasticity H in a relaxation spectrum obtained from frequency dispersion characteristics measured at temperatures of 60 and 80 degrees centigrade with a measurement frequency set in the range of 0.1 to 100 rad/sec and measurement strain set in the range of 0.02 to 4.5% is in the range of 10 to 900 Pa/cm2, and a relaxation time ? corresponding to the minimum value is in the range of 1 to 10,000 sec.

Abstract: An electrophotographic image forming method includes a charging step, an exposure step, a developing step and a transfer step in the rotation of an electrostatic latent image bearing member, in which a process speed of the electrostatic latent image bearing member is 200 to 500 mm/sec, an outer diameter of the electrostatic latent image bearing member is 15 to 35 mm, an outer diameter of a developer bearing member is 10 to 25 mm, and a magnetic single component developer of which the residual magnetization in a measured magnetic field of 796 kA/m is 0.5 to 5.0 Am2/kg is used as the developer. The electrophotographic image forming method can provide a good image quality without causing scattering of toner in downsizing, weight reduction of an electrophotographic apparatus and speed-up of an electrophotographic process.

Abstract: An electrophotographic image forming method includes a charging step, an exposure step, a developing step and a transfer step in the rotation of an electrostatic latent image bearing member, in which a process speed of the electrostatic latent image bearing member is 200 to 500 mm/sec, an outer diameter of the electrostatic latent image bearing member is 15 to 35 mm, an outer diameter of a developer bearing member is 10 to 25 mm, and a magnetic single component developer of which the residual magnetization in a measured magnetic field of 796 kA/m is 0.5 to 5.0 Am2/kg is used as the developer. The electrophotographic image forming method can provide a good image quality without causing scattering of toner in downsizing, weight reduction of an electrophotographic apparatus and speed-up of an electrophotographic process.

Abstract: An electrostatic latent image developer including a toner, which is formed from an outer additive and non-magnetic resin particles containing a binder resin and a coloring agent, and a carrier, in which a resin coating layer in which electroconductive fine powder is dispersed in a matrix resin is formed on a core, wherein a volume specific resistivity of said carrier is greater than or equal to 10.sup.9 .OMEGA..multidot.cm at an electric field strength of 3000 V/cm and is less than or equal to 10.sup.13 .OMEGA..multidot.cm at an electric field strength of 10000 V/cm, said outer additive contains titanium oxide whose volume specific resistivity of a compression-molded molded product is greater than or equal to 10.sup.6 .OMEGA..multidot.cm at an electric field strength of 3000 V/cm and is less than or equal to 10.sup.10 .OMEGA..multidot.

Abstract: The toner for developing an electrostatic charge image comprises a colorant, a binding resin and a resin copolymer of aliphatic hydrocarbon and aromatic hydrocarbon having 9 or more of carbon atoms. Preferably, the toner further comprises a wax. The endothermic peak of the wax at DSC is preferably from 70 to 100.degree. C. The petroleum resin copolymer preferably has a ring and ball softening point of from 80 to 170.degree. C., and the binding resin is preferably a polyester resin. The weight ratio of the aromatic hydrocarbon monomer and the aliphatic hydrocarbon monomer of the petroleum resin copolymer is preferably from 99:1 to 50:50.

Abstract: The present invention provides a carrier for developer of an electrostatic latent image and related technologies. The carrier is excellent in the ability to impart charge suitably and stably to toner and has a structure durable enough to maintain the ability for a long period of time such that the structure can prevent the toner from being adhered onto the carrier surface for a long period of time.The carrier comprises a core covered with a resin coating layer containing resin particles and an electroconductive fine powder in the form of a dispersion in a matrix resin.The carrier can be produced by a method comprising the steps of preparing a coating solution by placing materials in a solvent which can dissolve the matrix resin, but cannot dissolve the resin particles, dispersing the particles of the resin, applying the solution to a core and removing the solvent. A high-quality image can be formed by use of the developer comprising the carrier and the toner.