Patent application number | Description | Published |
20080226356 | IMAGE DEVELOPER USING ONE-COMPONENT DEVELOPER - An image developer using a one-component developer, Including a developing roller visualizing an electrostatic latent image formed on an image bearer with a pulverized toner; and a feed roller feeding the pulverized toner to the developing roller while contacting thereto, wherein the pulverized toner includes a parent toner; a wax; and an external additive comprising an additive having a number-average particle diameter of from 20 to 60 nm and adhering to the surface of the parent toner at an adherence strength of from 50 to 70%, and wherein the following relationships (1) to (3) are satisfied: | 09-18-2008 |
20080227009 | DEVELOPING DEVICE AND IMAGE FORMING METHOD USING ONE COMPONENT DEVELOPER, AND PROCESS CARTRIDGE USING THE DEVELOPING DEVICE - A developing device including a developing roller and a developer layer forming member for forming a layer of a one component developer on the roller. The developing device satisfies the relationships (1) 20Q/M>13.1α−44.5, wherein X represents the ratio (% by weight) of the wax present on the surface of the developer to the total of the wax therein; α represents the angle formed by a tangent line to the member at a point B, which is the center of the contact zone of the member contacted with the roller, and another tangent line at a point A thereof 0.5 mm apart from the point B toward the tip of the member, wherein α is 0 to π/2 radian; and Q/M represents the charge quantity (μC/g) of the toner per unit weight. | 09-18-2008 |
20080233506 | TONER, AND OILLESS FIXING METHOD AND PROCESS CARTRIDGE USING THE TONER - A toner useful for an oilless fixing method, includes a binder resin; a colorant; and 2.0 to 4.5% by weight of a wax which is soluble in n-hexane, based on a total weight of the toner, wherein the wax is dispersed in the toner, the wax forming wax domain particles (DA) comprising wax domain particles (DS) exposed at a surface of the toner and wax domain particles (DI) encapsulated in the toner and not exposed at the surface of the toner, wherein a weight of the DS is greater than a weight of the DI, wherein the toner from which the DS have been eluted with n-hexane comprises vestigial concavities having an area of 0.01 πμm | 09-25-2008 |
20080304875 | DEVELOPING DEVICE, DEVELOPER THEREFOR, AND IMAGE FORMING METHOD AND APPARATUS, AND PROCESS CARTRIDGE USING THE DEVELOPING DEVICE - A developing device including a developer bearing member configured to feed a developer to an image bearing member; a developer supplying member, which is contacted with the developer bearing member at a first nip while opposed thereto and which is configured to supply the developer to the developer bearing member; and a developer layer forming member, which is contacted with the developer bearing member at a second nip located on the downstream side from the first nip relative to the rotation direction of the developer bearing member to form the layer of the developer on the developer bearing member, wherein the developer is a nonmagnetic one component developer, and the distance between the front edge of the second nip and the rear edge of the first nip relative to the rotation direction of the image bearing member is greater than 0.8 mm and less than 2.0 mm. | 12-11-2008 |
20090041511 | SINGLE COMPONENT DEVELOPMENT DEVICE, PROCESS CARTRIDGE AND TONER - A single component development device including a toner including a resin, a coloring agent, a wax, a charge control agent and an inorganic particulate, a development roller to bear the toner on the surface of the development roller and transfer the toner to an image bearing member and a thin layer forming member to regulate a thickness of the layer of the toner while in contact with the surface of the development roller via the toner borne thereon, wherein a regulating pressure A between the thin layer forming member and the development roller is from 25 to 60 (N/m), a content Z (weight %) of the charge control agent satisfies the following relationship (1) and an average dispersion particle diameter D (nm) of the charge control agent satisfies the following relationship (2): | 02-12-2009 |
20090052952 | IMAGE FORMING APPARATUS, PROCESS CARTRIDGE AND TONER - An image forming apparatus including an image bearing member including a tube, the image bearing member to bear a latent electrostatic image, a development device including a pulverized toner including a resin, a coloring agent and a releasing agent component, the development device to develop the latent electrostatic image with the toner to form a visualized image on the image bearing member, a transfer device to transfer the visualized image to a recording medium, a fixing device including a fixing member, the fixing device to fix the visualized image on the recording medium and an elastic blade to remove the toner on the surface of the image bearing member, wherein the toner has a void ratio of from 52 to 58% and a toner torque of from 1.0 to 2.5 mNm according to a torque measuring method using a circular conical rotor and the following relationships (1) to (4) are satisfied: | 02-26-2009 |
20090117481 | TONER FOR ONE-COMPONENT DEVELOPER - A toner for one-component developer, including a mother toner including a binder resin including a polyester resin as a main component, a colorant and a release agent; and an external additive in an amount of from 2.5 to 5.0 parts by weight per 100 parts by weight of the mother toner, wherein the toner includes a hexane-extracted volume of from 10 to 40 mg/g and has a cohesion of from 50 to 90%. | 05-07-2009 |
20090186291 | NON-MAGNETIC TONER FOR ONE-COMPONENT DEVELOPMENT AND METHOD OF PREPARING THE TONER, AND IMAGE DEVELOPER, IMAGE FORMING APPARATUS, PROCESS CARTRIDGE AND IMAGE FORMING METHOD - A non-magnetic toner including a binder resin including a first resin, a second resin, a third resin; a colorant; and a wax, wherein the first resin is a hybrid resin including an amorphous condensation polymerization unit and a radical polymerization unit in its molecular frame, and the second and third resins are non-hybrid resins including condensation polymerization units, wherein each of the first, second and third resins has a glass transition temperature (Tg) and a softening point (Tm) satisfying the following relationships: | 07-23-2009 |